which type of dead bolt lock may violate fire ordinances
Dead bolt


in which an intruder inserts a pry bar between the door and the jamb and attempts to pry the bolt out of the door. Other types of deadbolts include: The double cylinder design raises a safety issue. In the event of a fire, occupants will be prevented from escaping through double-cylinder locked doors unless the correct key is used. This is often an avoidable cause of death in house fires. The risk can be mitigated by locking the deadlock only when there are no occupants inside the building, or leaving the
16936890
Bolt action


.22 caliber was J. G. Anschütz; the action is specifically the straight pull ball bearing lock action, which features spring-loaded ball bearings on the side of the bolt which lock into a groove inside the bolt's housing. With the new design came a new dry-fire method; instead of the bolt being turned up slightly, the action is locked back to catch the firing pin. Another distinct type of popular straight-pull design used in biathlon events is the "lateral toggle"-type straight-pull action, which used
10348069
Fedorov Avtomat


in the Winter War. The Fedorov Avtomat is a short-recoil operated, locked-breech weapon which fires from a closed bolt. The bolt locking is achieved by two dumbbell-shaped locking plates, mounted at either side of the breech, latching barrel and bolt together through lugs on the bolt. Those plates are allowed to tilt slightly down after about 10 mm of free recoil, unlocking the bolt. A bolt hold-open device is fitted and the firing mechanism is of hammer type. Captain V. Fedorov began a
7536853
C14 Timberwolf


bolt with dual front locking lugs plus one locking lug at the rear. It requires a 90-degree bolt rotation. the bolt is partly helically fluted which reduces weight and stops bolt debris jams. A double plunger ejector and hook type extractor are used to remove fired cartridge cases. This helps create a very smooth action which is very reliable. The extra locking lug at the rear assists in preventing the bolt from becoming jammed when chambering another round. Though not used by the Canadian military, the manufacturer offers a titanium receiver as an
6781778
Dead bolt


areas because they can be difficult to open from the inside and violate fire safety regulations. Some lock manufacturers also have a "lockable" knob: a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), "unless" a button has been pressed, in which case a key is also needed on the internal side. A variant of the standard deadbolt is the vertical deadbolt, invented by Samuel Segal. Vertical deadbolts resist "jimmying",
16936889
Flapper locking


Flapper locking is a type of locking mechanism used in self-loading firearms. It involves a pair of flappers on the sides of the bolt that each lock into an outwards recess in the receiver as the bolt is in battery. As the bolt is forced backwards after the firing of a cartridge, the flappers recede back into the bolt, therefore unlocking and sending the bolt backwards to cycle the gun. The design was patented in 1870 by Lieutenant Friberg of the Swedish Army, but the first actual example of a firearm that
21584867
Solenoid bolt


A solenoid bolt is a type of electronic-mechanical locking mechanism. This type of lock is characterized by the use of a solenoid to throw the bolt. Sophisticated solenoid bolt locks may use microprocessors to perform voltage regulation, reduce power consumption, and/or provide access control. Depending on the strength of the solenoid, some models can provide a holding force on the order of 1000 kg. A solenoid bolt can be designed either to fail open (the lock opens on power loss) or to fail closed (the device is locked
6395219
Break action


for a single locking lug, if it is not stout enough. The Thompson Center Contender, for example, was limited to .30-30 Winchester level cartridges. To fire more powerful cartridges requires a much larger locking lug, such as that which Thomson Center used on the larger Encore model. By comparison, while bolt-action shotguns may only use a single locking lug, almost all bolt-action rifles use multiple locking lugs around the perimeter of the bolt to provide an even distribution of the forces of firing, giving
15463126
Tilting bolt


Tilting bolt action is a type of locking mechanism in self-loading firearms. Essentially, the design consists of a moving bolt driven by a piston with gas pressure from the gas port behind the muzzle. The bolt drops down into receiver recess and locks on bolt closing. Tilting the bolt up and down locks-unlocks in the breech. This tilting allows gas pressure in the barrel from firing the gun to lower to safe levels before the cartridge case is ejected. This is in contrast with rotating-bolt mechanism of almost
14653447
Dead bolt


A dead bolt, deadbolt or dead lock is a locking mechanism distinct from a spring bolt lock because a deadbolt cannot be moved to the open position except by rotating the key. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself. A deadbolt can therefore make a door more resistant to entry without the correct key. A deadbolt is often used to complement a spring-bolt lock on an entry door to a building. A deadlock,
16936887
VSS Vintorez


VSS are derived from the AS assault rifle. The VSS is a gas-operated select-fire rifle. It has a long-stroke gas piston operating rod in a gas cylinder above the barrel. The weapon is locked with a rotating bolt that has 6 locking lugs which engage appropriate sockets machined into the receiver. The VSS is striker fired. It features a cross-bolt type fire selector switch located behind the trigger, inside the trigger guard; the safety lever and the charging handle resemble those used in Kalashnikov weapons
14025564
Palmer carbine


bolt, the Palmer's bolt was machined from a solid block of tubular metal, which had screw type lands and grooves to lock the bolt in place via a short stubby handle. The hammer of the weapon (located on the right side of the receiver like all other percussion fired rifles of the time period) holds the firing pin at the tip. A tooled, milled slot is visible on the head of the bolt canted toward the right side allows a slight opening for the firing pin atop the hammer to strike the
16997074
Dead bolt


key near the keyhole. Some fire departments suggest putting the key on a small nail or screw near the door at floor level, since the cleanest air is at floor level and you may be crawling to get to the exit, thus placing the key where it is easiest to find. Note that single cylinder dead locks (with an unlocked twist mechanism on the inside of the door) do not have this problem, and therefore are most commonly used on fire exits. Some areas have fire safety codes that do not allow
16936891
RPD machine gun


Egypt, North Korea (Type 62) and, since 1956, Poland. The RPD is an automatic weapon using a gas-operated long-stroke piston system and a locking system recycled from previous Degtyaryov small arms, consisting of a pair of hinged flaps set in recesses on each side of the receiver. The movement of these flaps and the resulting locking and unlocking action is controlled by carefully angled surfaces on the bolt carrier assembly. The weapon fires from an open bolt. The RPD is hammer fired from an open bolt
915684
MG 42


back and forth within the bolt assembly, the return spring is also responsible for pushing the striker sleeve forward during locking (described below). The bolt assembly locks with the barrel's breech (the end the cartridge is loaded into) via a prong type barrel extension behind the breech. As it is recoil-operated and fired from an open bolt, the weapon must be manually charged with the side-mounted charging handle. The roller-locked recoil operation functions as follows: two cylindrical rollers, positioned in tracks on
9933640
Stoner 63


bolt locking mechanism with 7 radially symmetrical locking lugs that engage a series of recesses in the barrel extension, and is actuated by a conventional long-stroke piston. The radial arrangement of locking lugs distributes the firing load evenly around the bolt head and barrel socket, reducing stress and increasing the longevity of these critical components. Attached to the piston extension is the bolt carrier which is equipped with a curved cam track that guides the bolt's cam pin (retained by the firing pin) and rotates the bolt 22.5° during the
17690963
FMK-3 submachine gun


safety. The safety selector has a wing-type lever that is activated from the left and which presents three positions: upper intermediate, "S" (safe), "R" (repeat), and "A" (automatic fire). As an additional security measure, the FMK-3 has a safety grip that acts in the following way: If the weapon is not correctly grasped, the safety locks the bolt. Thus, even if the gun is ready to fire, if not pressed, the bolt is
1682075
Lever tumbler lock


A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past. The number of levers may vary, but is usually an odd number for a lock that can be opened from each side of the door in order to provide symmetry. A minimum number of levers may be specified to provide an anticipated level of security (see 5 lever locks section
9221107
LWRC M6


While in OBA mode, the first round may be fired from a closed bolt (it will then lock back and subsequent shots will be from an open bolt until the operator manually closes the bolt again). Firing from an open bolt increases cooling and eliminates the potential for accidental discharges due to rounds "cooking off" in an overheated chamber. It also allows for a faster rate of fire. However, an open bolt design meant that the first round fired will have reduced accuracy when compared to a closed bolt design.
4622508
Knife legislation


on or about his person" any folding knife with a blade "less than" 5.5 inches long with a lock mechanism that locks the blade upon opening. This ordinance is designed to work in tandem with the Texas state statute making illegal the carrying of knives with blades "longer" than 5.5 inches. The San Antonio ordinance allows police to charge persons carrying most types of lock blade knives without good cause with a criminal misdemeanor violation, allowing police to remove the knife from the possession of the offender, while providing exemptions from
8671040
VAHAN (firearm)


two main assemblies to separate so the bolt can be removed and the internal parts accessed. The safety is a lever located inside the trigger guard, which both blocks the firing mechanism and locks the bolt in the forward position when flipped down. The trigger mechanism is the type popular in some submachine guns, where a partial pull will fire single shots and a complete pull will fire full auto. Sights consist of a two position rear aperture and front post, both with decent protective wings. There is also a Russian style scope
19525826
Bolt (firearms)


recoil spring (forward). When it moves back, the extractor pulls the spent casing from the chamber. When it moves forward, it strips a cartridge from the magazine and pushes it into the chamber. Once the case is clear of the chamber, the ejector kicks the case out of the firearm. The most common locking mechanism on rifles is a rotating bolt, which can be classified as a rigid type of bolt lock. Semi-rigid bolt locks have their locking elements movably mounted on either the bolt, barrel
5386022
PK machine gun


machine gun is equipped with a lever-type feed mechanism, mounted on the feed cover and operated by the feed lever, mounted on the right wall of the receiver and wrapping around the bolt carrier with its feed pawl and roller. The PK feed mechanism pulls the rimmed 7.62×54mmR cartridges out from the back of the ammunition belt and drops the cartridges down into the feed way, allowing the bolt to strip and feed the cartridges into the chamber for firing. The breech is locked by a rotating bolt, with two locking lugs
12874938
Angel Rifles


of the bedding. The position of the bedding screws, close together and near the trigger, was similarly claimed to minimise distortion in the action. Locking was achieved by a solid bolt head and three bolt lugs. The bolt head was designed to be removable thus allowing the owner to vary the head space by replacing the head. The bolt head is of the floating type whereby it is a loose fit in the bolt tube and held in place by a pin, the firing pin passing through a hole in that pin.
9937935
Remington Model 788


reduced because of the rear lugs. The bolt pictured is a pre-1975 locking model from a .308 Winchester caliber rifle. The locking bolt requires the safety to be in the "fire" or "off" position in order to rotate the handle and actuate the bolt. Rifles manufactured from 1975 to 1983 have non-locking bolts which can be actuated while the safety is engaged. The second distinguishing feature is the receiver. It has a smaller ejection port than similar bolt-action rifles, and no bolt lug raceways. The
18401969
Recoil operation


are based on a rotating locking bolt, similar to that used in many gas-operated firearms. Before firing, the bolt body is separated from the locked bolt head by a stiff spring. As the shotgun recoils after firing, inertia causes the bolt body to remain stationary while the recoiling gun and locked bolt head move rearward. This movement compresses the spring between the bolt head and bolt body, storing the energy required to cycle the action. Since the spring can only be compressed a certain amount, this limits the amount
9945191
Heckler & Koch HK33


bolt head with a pair of rollers and bolt carrier. Upon firing, the two cylindrical rollers in the bolt head are cammed inward by inclined surfaces of the barrel extension and impart a rearward motion on the locking piece, which also propels the bolt carrier rearward. This built-in mechanical disadvantage delays the movement of the bolt head relative to the bolt carrier which is withdrawing at four times the velocity of the bolt. The rollers soon compress entirely into the bolt head, clearing the locking recesses of the barrel extension, and
19053362
Karabinek wz. 1929


Carbine wz.29 was a bolt-action rifle, with typical Mauser-action lock, with two large main lugs at the bolt head and a third safety lug at the rear. Ammunition was fed from a fixed two-row box magazine holding five rounds. A three-position safety catch was attached at the rear of the bolt, securing the firing pin. The sights consisted of an open post-type front sight, and a tangent-type rear sight with a V-shaped rear notch; the rear sight was
17155773
M1917 Enfield


(arsenal) in the United Kingdom. This development named the Pattern 1913 Enfield or P13, included a front locking, dual lug bolt action with Mauser type claw extractor as well as a new, powerful rimless .276 Enfield cartridge. The design carried over a Lee–Enfield type safety at the rear of the action and a bolt that cocked on closing to ease unlocking of the bolt during rapid fire. An advanced design, for the era, of aperture rearsight and a long sight radius were incorporated to maximize accuracy potential.
2287036
MK 101 cannon


-barreled automatic cannon capable of firing nine different types of 30x184B mm ammunition (ranging from basic high explosive to tungsten-cored armor-piercing rounds). Featuring pneumatic cocking and fired by percussion via an electrical solenoid, the MK 101 was recoil-operated. In operation, the barrel and bolt recoiled 30 mm (1.18 in) to the rear after each shot. The bolt locked via a Stange-type machined sleeve with internal interrupted threads, similar to some Solothurn weapons such as the 7.92 mm (.312 in)
3989641
Nut (hardware)


A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together. In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, specialist adhesive thread-locking fluid such as
21734475
M1918 Browning Automatic Rifle


by propellant gases bled through a vent in the barrel. The bolt is locked by a rising bolt lock. The weapon fires from an open bolt. The spring-powered cartridge casing extractor is contained in the bolt and a fixed ejector is installed in the trigger group. The BAR is striker-fired (the bolt carrier serves as the striker) and uses a trigger mechanism with a fire selector lever that enables operating in either semi-automatic or fully automatic firing modes. The selector lever is located on the left side
9861184
MG 51


. It uses a modified MG 42 type locking system with a two-piece bolt and dual locking flaps located in the front part of the bolt. These flaps engage the cuts made in the short barrel extension to provide rigid locking. Upon recoil, the flaps are retracted toward the center of the bolt, to unlock it. An additional lever-type bolt accelerator is provided; it is located in receiver, next to the barrel breech and below the bolt. The gun housing also somewhat resembles the German MG 42,
7152106
CZ 807


gas-driven select-fire rifle of dual calibers. The ambidextrous charging handle is easy to change sides on. It has a modular design, with an aluminum alloy upper receiver & a polymer lower receiver/fire control group. The bolt is a multi-lug type riding in a bolt carrier, locking into a barrel extension. The system is balanced well, and designed to meet the most rigorous modern requirements of an assault rifle. The materials used are non-flammable or fire-resistant, impact resistant and have
10756864
RPD machine gun


. The hammer forms part of the rear of the bolt carrier (which is connected to the gas piston), which continues moving forward for a short distance after the round is chambered and the bolt locked, the hammer face then striking the rear of the free floating firing pin which passes through the length of the bolt. Locking occurs by means of lateral flaps located along the sides of the bolt, which are forced outwards (by the angled sides of the hammer) into recesses cut into the receiver body, after which
915685
Bolt action


cost, the bolt action is still the design of choice for many hunters, target shooters and marksmen. The bolt action's locking lugs are normally at the front of the breech (some designs have additional "safety lugs" at the rear), and this increases potential accuracy relative to a design which locks the breech at the rear, such as a lever action. Also, a bolt action's only moving parts when firing are the pin and spring. Since it has fewer moving parts and a short lock time,
10348082
Anschütz 1827 Fortner


pull mechanism uses six ball bearings to lock the bolt. The 1827F has a lock time around 1.7 milliseconds, which together with a dwell time (ignition delay plus barrel time) of around 2.3 ms gives a total time of around 4 ms from activation of trigger to the bullet has exited the barrel. The straight pull mechanism uses 6 ball bearings to lock the bolt. In order to prevent damage to the firing pin during dry fire, an optional firing pin buffer (also called "Dry Fire Donut") must be
18856124
MG 15


the lockring rotates and locks the bolt and barrel extension together. At this point the trip lever releases the firing pin and the gun fires. Recoil pushes the barrel, lock and bolt backwards until the lockring hits a cam that rotates it unlocking the bolt and barrel. Inertia carries the bolt backwards until the base of the fired case hits the ejector flinging the empty out of the receiver. If the trigger is held down the cycle will continue. If the trigger is released the bolt will remain in the rearward position. The
7004308
Heckler & Koch HK21


. The HK21 is a selective fire roller-delayed blowback-operated firearm with a semi-rigid locking mechanism designed to retard the rearward movement of the bolt. This delay was achieved by artificially increasing the inertia of the bolt by using an angular, interposed transmission system, installed symmetrically to the bore axis, with two cylindrical rollers acting as transmission elements against a movable locking piece which drives the heavy bolt carrier. The two-piece bolt assembly consists of a bolt head, which contains the aforementioned rollers, and a supporting
1057123
CETME Ameli


with the 7.62mm Model C and 5.56mm Model L rifles extend to the interchangeability of certain parts. The heart of the operating system is the bolt assembly, which consists of a bolt head, locking piece and two cylindrical rollers, which upon chambering a round, are displaced outwards by angled surfaces in the forward pressing locking piece and into notches in the barrel extension. The geometry of the walls in the barrel extension and the locking piece ensure that once a shot is fired, the bolt head absorbs the recoil impulse from
9982343
Heckler & Koch HK21


) and tripod and vehicle mounting points. The HK21 has close to a 48% parts interchangeability with the G3. The bolt features a spring-powered extractor and an anti-bounce device that prevents the bolt head from glancing off the barrel extension upon forward return of the locking assembly. The lever-type ejector system is contained in the trigger group housing and is actuated with every shot by the recoiling bolt. The weapon has a hammer striker and is fired from the for a general-purpose machine gun rare closed bolt
1057126
Repeating rifle


up the reserve rounds, positioning the topmost between the bolt and the chamber at the base of the barrel. Pushing the bolt lever forward chambers this round and pushing the lever into the notch locks the bolt and enables the trigger mechanism. The complete cycle action also resets the firing pin. The Mauser rifle of the late 19th and early 20th centuries is the most famous of the bolt action types, with most similar weapons derived from this pioneering design, such as the M1903 Springfield and the Karabiner 98 Kurz rifle (abbreviated often
9553167
IMI Galil


country. The Galil series of rifles are selective fire weapons operated by a Kalashnikov-pattern gas-driven piston system with no regulator. The weapon is locked with a rotary bolt with two locking lugs that lock into recesses milled into the receiver. When fired, a portion of the propellant gases are evacuated into the gas cylinder through a port, drilled at a 30° angle in the barrel, and a channel in the gas block. The high-pressure gases drive the piston rod (which is attached to the bolt
20109079
Vz. 52 rifle


was taken over by Česká zbrojovka Uherský Brod. The vz. 52 is a shoulder-fired semi-automatic rifle with a tilting-bolt locking mechanism powered by an annular short-stroke gas piston system. The bolt is locked by two lugs that recess into slots machined into the receiver. However, unlike most vertically-locking breech mechanism, the rifle's bolt has the unusual feature of tipping the bolt frontally to lock the mechanism, whereas other tipping bolt designs tip the bolt to the rear. The piston is actuated
20871082
Jarmann M1884


The Jarmann M1884 fired a 10.15 mm black powder cartridge in an 8-round, tubular magazine in which the rounds were lined up in a tube below the barrel. It has a non-rotating bolt (the part of the action that seals the rear end of the barrel) locked by a rotating bolt handle, and reputedly a smooth action. However, this action is not considered strong enough to fire modern ammunition, since the only locking is provided by the rotating bolt handle. Jacob Smith Jarmann designed his first breech-loading
766160
Rheinmetall MG 3


recoil-operated firearm. It features a roller locked bolt mechanism that consists of the bolt head, a pair of rollers, the striker sleeve, bolt body and return spring. The bolt is locked securely by a wedge-shaped striker sleeve, which forces two cylindrical rollers contained in the bolt head outward, and into corresponding recesses in the extension of the breech of the barrel. On firing, both the barrel and barrel extension recoil to the rear. The resulting impact (much like a Newton's cradle) moves the
20627258
Type 80 (pistol)


other military personnel of the People's Liberation Army of China. It was accepted into service in 1980. The Type 80 was created by refining and upgrading the design of the various Chinese copies of the imported German selective-fire M712 Schnellfeuer version of the Mauser C96 "Broomhandle" semi-automatic pistol that were produced and used in China in the 1930s. The internal design is derived from the basic Mauser action, with a slight recoil of the barrel enabling the locking piece under the lightweight bolt. This enables the bolt to
15127918
Heckler & Koch SL8


The Heckler & Koch SL8 is a semi-automatic rifle manufactured by Heckler & Koch. It is the civilian version of the Heckler & Koch G36. The rifle fires the .223 Remington or 5.56×45mm NATO cartridge and feeds from a 10-, 20- or 30-round detachable magazine (depending on the variant of the rifle). Unlike earlier types of HK rifles, it is not a roller lock bolt but rather a lug-type rotating bolt system as seen on the AR-18. To adapt the G36 for the civilian market, its
16897494
Pattern 1913 Enfield


1913 Enfield showed the emphasis on accurate, rapid fire emphasized by British Army training during this period. The adjustable flip-up aperture rear sight with a battle setting when folded down was an excellent design, allowing rapid and accurate sight acquisition, and was advanced for the period. The Mauser-type bolt had a low-profile bolt handle with an integral safety lug built into its base that locked in the receiver. The unusual 'dog-leg' shaped bolt handle is low profile and places the bolt knob just rearwards
2934316
Blowback (firearms)


which rely on a locking barrel and slide assembly instead of blowback. But blowback guns can be used to fire powerful cartridges if they are of the other two types already mentioned: API or delayed/retarded blowback. In the API blowback design, the primer is ignited when the bolt is still moving forward and before the cartridge is fully chambered. This requires a very careful design to ensure the proper balance and equalization of forces between the projectile weight, propellant charge, barrel length, bolt weight, and return spring strength.
2300941
Benelli B76


locking lever that links the bolt with the slide which acts as a bolt carrier. Upon firing, while the pistol recoils in the hand of the shooter, the inertia of the slide makes it maintain its position relative to the receiver, constraining the bolt ribs' motion in the corresponding grooves via the locking lever, and so keeping the breech positively locked. As soon as the recoil movement of the pistol in the hand of the shooter slows down, the slide tends to continue its rearward movement, so retreating relative to the
5949608
Gewehr 41


The Mauser design, the G41(M), was the only one of the two that respected the criteria imposed. The end result was an overly complex, unreliable, clunky and heavy rifle. It incorporated a familiar sighting and control arrangement to the standard Kar98k rifle. The G41(M) was striker-fired, rotating-bolt locking and featured a traditional bolt handle/charging handle that automatically disconnected the bolt assembly from the recoil spring should the rifle be used in manual mode. The flag-type safety cams and blocks the striker
17113642
MG 42


one used on the MG 34, could be mounted to the front or the center of the gun depending on how and where it was being used. The roller-locked bolt assembly consists of a bolt head, two rollers, a striker sleeve, bolt body, and a large return spring, which is responsible for pushing the bolt assembly into battery (the locked position) and returning it there when it is unlocked and pushed backwards by the recoil of firing or by the charging handle. As the striker sleeve is movable
9933639
Brügger & Thomet APR


of the emergency iron sight, designed as factory zeroed flip-up sight. Into the above-mentioned locking ring, the bolt locks by rotation; thus, the receiver with locking ring, bolt and barrel form the breech of the rifle. The APR rifle has a traditional manually operated rotary bolt with three radial locking lugs at the front. The bolt requires only a 60° bolt rotation; both features should be appreciated by the shooter during multiple firings that require rapid projectile placement on the target. The trigger group,
4648185
ZK-383


submachine gun which resembles the German MP 18. For a submachine gun, the ZK-383 was a heavy and robustly made weapon. Military versions possessed detachable barrels, an integrated bipod, and rifle type sights, components considered unusual in submachineguns of the era. The police variant, designated the ZK-383-P, lacked these features, as did the postwar ZK-383-H. The ZK-383 was fitted with a quickly detachable barrel. The lock/release mechanism was located beneath the front sight. It fires from an open bolt and by removing the bolt weight,
10341850
CETME Model L


locking piece. During the "unlocking" sequence, the two cylindrical rollers contained in the bolt head are cammed inward against inclined flanks of the barrel extension and act upon the locking piece and bolt carrier, propelling it rearward at a velocity greater than that of the bolt, which remains closed until the fired bullet has left the barrel and pressures inside the bore have been reduced to a safe level before withdrawing together with the bolt carrier. The bolt also has a cartridge casing extractor, while the ejector is located inside the trigger
19813304
M1895 Lee Navy


by pushing down with the thumb on the safety button. Unlike many other military rifles of the day, the Lee was not fitted with a turning bolt. Though frequently described as a straight-pull action, the M1895 Lee actually uses a camming action in which a steel wedge or locking block beneath the bolt is forced into a recessed area in the receiver. Pulling the operating handle back causes the bolt to rock back and upwards, freeing a locking stud on the receiver and unlocking the bolt. The firing pin cocked on
10460960
Vektor R4


to provide power to the operating system. The weapon features a self-regulating gas system and a rotary bolt breech locking mechanism (equipped with two locking lugs), which is rotated by a helical camming groove machined into the bolt carrier that engages a control pin on the bolt. Extraction is carried out by means of a spring-loaded extractor contained in the bolt and a protrusion on the left guide rail inside the receiver acts as the fixed ejector. The R4 is hammer-fired and uses a trigger mechanism with a
6990838
SIG Sauer 205


action was delivered in either a right or left hand version. The mechanical safety is placed on the tang of the stock (similar to the 202) so that the safety can be disengaged without putting the finger inside the trigger guard. The magazine is a proprietary staggered feed double stack type. The action uses the so called "fat bolt" principle, enabling smooth operation of the bolt. The bolt lugs engage directly into the barrel with a 60 degree rotation. The firing pin is relatively lightweight, giving a lock time
19859967
Škorpion


0.25 kg). The bolt remains locked open after the last cartridge from the magazine has been fired and can be snapped back forward by pulling the cocking handle knob slightly to the rear. The Škorpion is equipped with open-type iron sights (mechanically adjustable forward post and flip rear sight with 75 and 150 m range notches) and a folding metal wire shoulder stock, which folds up and over the receiver and is locked on the front sight’s protection capture. The Škorpion, together with a short magazine, is carried
13340657
MP35


was a blowback operated, selective fire SMG which fired from an open bolt. The weapon featured a non-reciprocating cocking handle placed at the rear of the receiver, which was operated in a similar fashion to bolt-action on a Mauser rifle. This involved the weapon carrier to manually pull the handle up, pull backwards, push forwards and lock back down. When the gun was then fired the cocking handle remained stationary. On the BMP32 the weapon featured a safety at the rear of the bolt (again in a
14682073
Open bolt


imparted to the firing pin to ignite the primer. In this circumstance there will be a round in the chamber and a firing pin pressing on it with some force, but not enough to ignite the primer, which requires a sharp, focused impact. However, the weapon would be at risk of firing if dropped, much like the danger of loading spitzer bullets into a weapon with a tube magazine. A related issue is that the safety of an open-bolt weapon must be designed to lock the bolt in the rearward
21174701
Breechblock


shoulder in the receiver or body of the firearm. This type of locking is usually reserved for low-pressure applications such as the .22 cal rimfire series. More often, the bolt locks closed with two or more lugs that operate like a bayonet mount. Multiple lugs permit a smaller degree of rotation to lock and unlock the breech. Most types are front-locking and have the lugs mounted near the breech face. A notable exception is the rear-locking system used in the Lee–Enfield. Rotating bolts can be
4867409
FN CAL


. Although the weapon resembled a scaled-down FN FAL, it in fact used a rotating bolt, unlike the FAL, which used a tilting bolt design. The earlier models of the CAL had a three-round selector system, which allowed the weapon to fire a three-round burst with each trigger pull. The CAL could also fire in fully and semi-automatic modes. The gas system used a tappet piston rod to operate the bolt carrier, and the bolt itself had interrupted lugs to lock it into the
20486549
Belleville washer


bolt action target rifles use Belleville washer stacks in the bolt instead of a more traditional spring to release the firing pin, as they reduce the time between trigger actuation and firing pin impact on the cartridge. Belleville washers, without serrations which can harm the clamping surface, have no significant locking capability in bolted applications. On aircraft (typically experimental aircraft) with wooden propellers, Belleville washers used on the mounting bolts can be useful as an indicator of swelling or shrinkage of the wood. By torquing their associated bolts to provide a
1698264
M1895 Colt–Browning machine gun


into a hole which allowed the rear of the bolt to tilt downward, seating it against the rear of the breech and locking it in position. The bolt remained locked when the round was fired. As the bullet travelled down the barrel after firing, it eventually passed a hole drilled in the bottom of the barrel known as a "port". The hot gasses behind the bullet flow into the port and push down on a plug, marked "p" in the diagrams. This causes the plug to pop out of
21639190
Security locknut


A security locknut is a type of industrial fastener composed of two steel threaded parts: a nut body and an elliptical spring steel lock ring. Security locknuts are fastened onto a mating bolt to form a bolted joint. Forces of friction (with elastic deformation), a stretching of the bolt, and compression hold the bolted joint firmly together. The lock ring, once assembled into a counterbore in the nut body, provides clamping force on the bolt while the nut body takes the load. This isolates the loading and locking functions
7911477
Warded lock


rotating the key, and to help correctly align the key with the wards. The key has a corresponding hole which fits over the post. When the correct key is inserted, it will clear the wards and rotate about the center post. The key may then strike a lever, activating a latch or sliding bolt, or it may itself push against the latch or bolt. In a double acting lever lock, the key may additionally push against a spring-loaded lever which holds the sliding bolt in place. Due to
13917670
Ultimax 100


capable of fully automatic fire only) with a short-stroke gas piston operating system powered by ignited powder gases diverted from the barrel through a port in the gas block. The Ultimax 100 is a locked breech weapon with a rotating bolt that contains 7 locking lugs. It fires from an open bolt position. The bolt contains both a spring extractor and a casing ejector. The weapon's non-reciprocating cocking handle is located on the left side of the receiver and occupies the forward position during firing. The Ultimax 100 is
15734546
Gewehr 98


the bolt is opened, and the cocking piece protrudes visually and tactilely from the rear of the bolt to indicate the action is cocked. A cocking shroud lock that was not present on previous Mauser bolt-action designs was added. The distance the firing pin needs to travel was decreased to reduce and hence improve lock time — the amount of time between initiating the firing sequence by releasing the trigger and the firing pin striking the primer that ignites the propellant contained in the 7.92×57mm Mauser cartridge. The M98 action features two large
358144
SKS


wooden stock and rifle grip. It is a gas-operated rifle that has a spring-loaded bolt carrier and a gas piston rod that work to unlock and cycle the action via gas pressure exerting pressure against them. The bolt is locked to contain the pressure of ignition at the moment of firing by tilting downwards at its rear and being held by a lug pressed into the receiver. At the moment of firing, the bolt carrier is pushed rearwards, which causes it to lift the bolt, unlocking it, and allowing
21984586
Nebula Maker


become perverted and fanatical, and war breaks out in the heavens. It is discovered that nebulae can journey to other nebulae if they feed on the dead "flesh" of their fellows, and this development fuels aeons of conflict. The novel then focuses on two individual nebulae, Bright Heart and Fire Bolt, who embody the human types Stapledon was most fascinated by – the saint and the revolutionary. Bright Heart preaches peace, and is martyred for his troubles; Fire Bolt brings about revolution and changes the social order of the
20481234
Heckler & Koch MP5


a bolt carrier. The heavier bolt carrier lies up against the bolt head when the weapon is ready to fire and inclined planes on the front locking piece lie between the rollers and force them out into recesses in the barrel extension. When fired, expanding propellant gases produced from the burning powder in the cartridge exert rearward pressure on the bolt head transferred through the base of the cartridge case as it is propelled out of the chamber. A portion of this force is transmitted through the rollers projecting from the bolt head, which are
14493436
Thompson submachine gun


version joining the familiar 20-round type. The Cutts compensator, barrel cooling fins, and Blish lock were omitted while the buttstock was permanently affixed. Late production M1 stocks were fitted with reinforcing bolts and washers to prevent splitting of the stock where it attached to the receiver. The British had used improvised bolts or wood screws to reinforce M1928 stocks. The M1 reinforcing bolt and washer were carried over to the M1A1 and retrofitted to many of the M1928A1s in U.S. and British service. Late M1s also had simplified fire control switches, also
10836764
Ruger Police Carbine


. These two parts are held together by strong, rigid steel bars. The combined mass serves to hold the breech safely closed during firing, while keeping the center of gravity forward, so the gun handles well. Another unique feature is the bolt lock. Since blowback guns of these calibers require heavy bolts, the inertia of dropping the gun can cause the bolt to come partially open, rendering the gun unfirable until the bolt is manually closed all the way. To prevent this, the Carbine uses a bolt lock that locks
5154608
IWI Negev


the bolt carrier assembly acts as the striker, and fires from an open bolt position. A lever-type fire control selector switch is provided (“A”— for fully automatic fire and “R”— for semi-automatic fire), installed on the left side of the pistol grip, which doubles as a manual safety against accidental firing. The safe “S” position disables the sear mechanism (which makes it impossible to cock the bolt carrier), by lifting the lever responsible for holding the bolt carrier
1750270
Pin tumbler lock


the door, and a horizontal bolt that slid into the post. The bolt had vertical openings into which a set of pins fitted. These could be lifted, using a key, to a sufficient height to allow the bolt to move and unlock the door. This wooden lock was one of Egypt's major developments in domestic architecture during classical times. Such a lock, however, may be defeated by lifting the pins uniformly beyond the unlatching point. In 1805, the earliest patent for a double-acting pin tumbler lock
1623673
MG 34


with a rotating bolt operated by short recoil aided by a muzzle booster. When the firearm is ready to fire the bolt is pulled back to the rear and is held back by the sear. With the pull of the trigger the sear disengages sending the bolt forward under pressure from the recoil spring. A cartridge is stripped from the magazine or belt and the round is pushed into the chamber. As the bolt moves forward into battery the bolt rotates engaging the locking lugs and chamber locking the bolt to the barrel. The striker
9933433
Parker-Hale M82


weight of 2.04 kg/4.5 lbs and a length of 60 cm. Rifling follows a 1:12 turn ratio with 4 right hand twists. The action is a Mauser-style rotating bolt type. It has 3 stainless steel locking lugs at the front and rear of the bolt. The C3 safety is a thumb activated lever above the magazine which locks the trigger, bolt and sear giving ultimate protection against an accidental discharge. The standard sight on the revamped model C3A1 is an Unertl 10× zoom scope which can only be used for daytime engagements
18175142
RK 95 TP


into service with the Finnish Army as the 7.62 RK 95 TP. The RK 95 TP is a select-fire, gas-operated firearm using the Kalashnikov-pattern operating system with a long stroke gas piston rod coupled to the bolt carrier as in the AK rifle. The rotating bolt locks into battery via two locking lugs. The weapon's spring extractor is installed inside the bolt head and enclosed in one of the locking lugs while the ejector is a fixed protrusion of the internal bolt carrier guide rail. The firearm uses
3197710
Machine gun


the round from firing before it is seated properly. Machine guns are controlled by one or more mechanical sears. When a sear is in place, it effectively stops the bolt at some point in its range of motion. Some sears stop the bolt when it is locked to the rear. Other sears stop the firing pin from going forward after the round is locked into the chamber. Almost all machine guns have a "safety" sear, which simply keeps the trigger from engaging. The first successful machine-gun designs were
19984281
Bolt action


place. The operation can be done via a rotating bolt, a lever, cam-action, locking piece, or a number of systems. Straight-pull designs have seen a great deal of use, though manual turn-bolt designs are what is most commonly thought of in reference to a bolt-action design due to the type ubiquity. As a result, the bolt-action term is often reserved for more modern types of rotating bolt-designs when talking about a specific weapon's type of action. However
10348073
Transaction Processing Facility


LLF and ELLF were both replaced by the Multipathing Lock Facility (MPLF). To run, clustered (loosely coupled) z/TPF requires either MPLF in all disk control units or an alternative locking device called a Coupling Facility. Records that absolutely must be managed by a record locking process are those which are processor shared. In TPF, most record accesses are done by using record type and ordinal. So if you had defined a record type in the TPF system of 'FRED' and gave it 100 records or ordinals
11652521
M1919 Browning machine gun


in the same way, even though most featured quick-change barrels and an open bolt, two features that make air-cooled machine guns capable of sustained fire, and features that the M1919 design lacked. When the gun was ready to fire, a round would be in the chamber and the bolt and barrel group would be locked together, with the locking block at the rear of the bolt. When the rear of the trigger was pivoted upwards by the operator, the front of the trigger tipped downward, pulling the
9434450
Cocking handle


feed, stovepipe or misfire; it verifies that the weapon's chamber is clear of any rounds or other obstructions; it moves the bolt in to battery, acting as a forward assist (but not necessarily); it releases a bolt locked to the rear, such as would be the case after firing the last round on a firearm equipped with a last-round-hold-open feature. These devices vary significantly between firearms but may occur in the form of a small protrusion or hook from the side of the bolt
800021
Heckler & Koch G41


lay in the 7.92×33mm Kurz StG 45(M) Assault rifle, and later the 7.62×51mm NATO G3 battle rifle. It is a selective fire automatic weapon that employs a roller-delayed blowback system of operation. The two-piece bolt mechanism consists of a bolt head that contains two cylindrical rollers and a wedge-shaped locking piece, attached to a heavy bolt carrier. When fired, the build-up of gas pressure generated by the ignited powder charge exerts rearward pressure on the bolt, which is then transferred onto the
22173114
Dead bolt


if it is cylinder operated, may be either single cylinder or double cylinder. A single cylinder deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side. Double cylinder locks will accept a key on both sides and therefore do not require (and often do not have) any twist knob. This prevents unwanted unlocking of the door by forced access to the interior twist knob (via a nearby window, for example). Double cylinder locks are sometimes banned from
16936888
M1895 Lee Navy


the bolt handle strips a round from the magazine; as the bolt is slammed home, the bolt's wedge lock seats into place, the firing pin is cocked, and the fresh cartridge is seated in the chamber. Once the M1895 is cocked, the rifle's bolt cannot be retracted unless the bolt-release lever is pushed downward. This prevents opening of the action caused by an inadvertent bump or contact to the bolt handle. The rifle has a safety located on the top of the receiver, which is released
10460959
Blaser R8


Control/iC"). The barrel has a quick-change design which lets the user switch barrels using two screws and a hex key. Different bolt heads for different groups of calibers are also user changable, making the Blaser R8 a modular firearm. The Blaser R8 straight-pull bolt action locks by a 14-lug radial collet in a 360 degrees groove in the barrel and is designed to withstand pressures significantly exceeding the Mauser 98–type bolt-action rifles. The Blaser R8 displays a locking surface of compared to for the Mauser
6635383
Hispano-Suiza HS.404


the parent Oerlikon FF S in many respects, its repeating mechanism was a gas-operated locking bolt. On firing the 404, when the projectile passes a hole cut into the barrel about half way along its length hot gas behind the projectile is siphoned off and enters a chamber. Inside the chamber is a piston that presses on a rod running along the top of the barrel back to the bolt, unlocking it and allowing it and the spent cartridge to move backwards. Since the bolt was locked during firing, it could
17944997
Uzi


mechanism which will catch the bolt and lock its movement if it is retracted past the magazine, but not far enough to engage the sear. When the handle is fully retracted to the rear, the bolt will cock (catch) on the sear mechanism and the handle and cover are released to spring fully forward under power of a small spring. The cover will remain forward during firing since it does not reciprocate with the bolt. The military and police versions will fire immediately upon chambering a cartridge as the Uzi is an open
4298101
Savage Model 110


The forward position is fire, the middle position locks the trigger while allowing the bolt to be opened and the rifle unloaded, and the rear position locks both the trigger and the bolt. The bolt-release lever is located on the right side of the action (on right-handed models) behind the ejection port. Pressing this lever down while pulling the unlocked bolt to the rear allows the bolt to be removed from the rifle for cleaning. There are many different models of the 110 series designed for different purposes.
4423720
Recoil operation


compresses the return spring. Once the bolt reaches the end of its travel, the return spring provides the force to chamber the next round from the magazine, and lock the bolt closed. Some short-recoil–operated firearms, such as the German MG42, use a mechanism at the muzzle to extract some energy from the escaping powder gases to push the barrel backwards, in addition to the recoil energy. This boost provides higher rates of fire and/or more reliable operation. This type of mechanism is also found in some suppressors
9945194
Sten


an open bolt with a fixed firing pin on the face of the bolt. This means the bolt remains to the rear when the weapon is cocked, and on pulling the trigger the bolt moves forward under spring pressure, stripping the round from the magazine, chambering it and firing the weapon all in the same movement. There is no breech locking mechanism, the rearward movement of the bolt caused by the recoil impulse is arrested only by the mainspring and the bolt's inertia. The basic operating principles were similar to those of
10220099
AKM


a "rate reducer". In fact its primary purpose is not to reduce the rate of automatic fire; it is a safety device to ensure the weapon will only fire on automatic when the bolt is fully locked, as the hammer is tripped by the bolt carrier's last few millimetres of forward movement. The device also reduces "trigger slap" or "trigger bounce" and the weapon’s rate of fire, which also reduces the dispersion of bullets when firing in fully automatic mode. The hammer was also changed and
2156412
Lee–Enfield


black-powder rifle, which combined James Paris Lee's rear-locking bolt system that had a barrel featuring rifling designed by William Ellis Metford. The Lee action cocked the striker on the closing stroke of the bolt, making the initial opening much faster and easier compared to the "cock on opening" (i.e., the firing pin cocks upon opening the bolt) of the Mauser Gewehr 98 design. The bolt has a relatively short bolt throw and features rear-mounted lugs and the bolt operating handle places the bolt knob
14268600
Punch press


akin to a complete circle with the ram being centered within the frame to stop frame deflection or distortion. C type presses have a bed plate which is used to lock the die bottom bolster. For locking the die, T-bolts are used and so this plate contains T-slots into which T-bolts are slid in. These slots are placed diagonally and with a slot horizontal to the longer side of the plate, is the general practice. These slots run up to a central hole made in the plate,
3525438
Steyr AUG


and magazine. The AUG has a rotating bolt that features 7 radial locking lugs and is unlocked by means of a pin on the bolt body and a recessed camming guide machined into the bolt carrier. The bolt carrier itself is guided by two guide rods brazed to it and these rods run inside steel bearings in the receiver. The guide rods are hollow and contain the return springs. The bolt also contains a claw extractor that forms the eighth locking lug and a spring-loaded "bump"-type casing ejector. The gas cylinder is
13788719
Sa vz. 23


The Sa 23 series utilize a straightforward blowback action, with no locked breech, and fire from the open bolt position. They also use a progressive trigger for selecting between semi-automatic fire and fully automatic fire. Lightly pulling on the trigger will fire a single shot. Pulling the trigger farther to the rear in a continuous motion will fire fully automatically, until the trigger is released or the magazine is empty. The Sa 23 series were the first production-model submachine guns with a telescoping bolt, in which the forward
6246011
Freedom of religion in Pakistan


are considered a violation of the Hudood Ordinances. If a woman cannot prove the absence of consent in a rape case, there is a risk that she may be charged with a violation of the Hudood Ordinances for fornication or adultery. The maximum punishment for this offence is public flogging or stoning. However, there are no recorded instances of either type of punishment since the law was introduced. According to a police official, in a majority of rape cases, the victims are pressured to drop rape charges because of the threat
15340492