fig1 displays a perspective view of a fly catching apparatus 10 . a housing 12 comprises a lid gasket 20 interfacing a lid 14 and a housing body 16 with a gasket seat 22 , and with a multitude of screws 18 to form an airtight seal . a multitude of prefabricated holes 24 in lid 14 and lid gasket 20 enable screws 18 to fasten to a multitude of threaded holes 21 . an interior view of a housing plate 90 is shown in fig2 a and 2b . a central processing unit ( cpu ) 92 is connected to a pressure sensor 94 via a wire 96 , to an air pump 98 via a wire 100 and to a switch 102 via a wire 104 . three other leads , a wire 44 , a wire 48 and a wire 52 connect cpu 92 with components of a corridor 30 ( described further below ; see also fig3 a and 3b ). a one - way air valve 106 and air pump ( vacuum pump ) 98 are part of the same structure . a cord gasket 108 provides an airtight seal between a power cord 110 and housing plate 90 . fig2 b displays the exterior view of housing plate 90 . an air outlet 112 provides an exit for air evacuated by air pump 98 through one - way air valve 106 . a power plug 114 is attached to power cord 110 . a multitude of screws 116 fasten housing plate 90 to housing 12 through a multitude of prefabricated holes 118 in housing plate 90 and in a housing gasket 120 to a multitude of threaded holes 122 such that components attached to housing plate 90 rest inside housing 12 facilitated by a housing access 124 and creates an airtight seal . fig3 a and 3b show corridor 30 and its comprising parts . a funnel 32 is a tapering cylinder or tube originating with a portal 34 and terminating with an electromagnetic port / door 36 ( em port / door 36 ). em port / door 36 comprises a door 38 attached by a hinge 40 to an electromagnetic port 42 comprising an electromagnet ( em port 42 ). the electromagnet may be ring - shaped ( ring magnet ) as shown at 42 . em port / door 36 is attached to funnel 32 preferably by mechanical and adhesive means . the port 42 comprises an opening ( not specifically shown ) at the end of the funnel 32 , an opening covered by the door 38 when closed and opening the housing to atmosphere when open . as shown , the hinge 40 is arranged that the door 38 opens upwardly and inwardly of the housing . cpu 92 is connected to em port 42 via wire 44 , to an electric light attractant 46 via wire 48 and to a motion detector 50 via wire 52 . the motion detector 50 serves as a fly sensor and could take other forms as noted below . a flange 54 is an extension of the outside of funnel 32 . a passageway 56 is that area inside funnel 32 from portal 34 to em port / door 36 . a scent duct 58 is a chamber which runs parallel to passageway 56 within funnel 32 originating at a scent access 60 and terminating with a scent pore 62 . a plug 64 fits scent access 60 and has a string 65 attached . on funnel 32 , proximate portal 34 , are a series of air holes 66 . a finger guard 68 spans portal 34 . finger guard 68 is a safety feature which acts to keep fingers out of passageway 56 and air holes 66 are a safety feature which allows air to pass by if someone decided to cup his hand over portal 34 and somehow trigger it . fig3 a shows the relationship of corridor 30 to the surrounding components . projecting from housing 12 is a threaded protrusion 70 , which terminates with a corridor gasket seat 72 and encloses a corridor access 74 . as corridor 30 is inserted into corridor access 74 , flange 54 presses a gasket 76 to gasket seat 72 and forms an airtight seal as a female - threaded ring lid 78 is screwed onto threaded protrusion 70 . an angle σ 80 denotes that em port / door 36 preferably is slightly angled to funnel 32 , such that when door 38 hinges inwardly open , gravity alone would bring it back into contact with em port 42 . fig4 a and b show a straight on view and an exploded lateral view of a cleanout area 130 ( denoted by a dash - dot line in fig1 ), respectively . from fig4 b we can see that a threaded protrusion 132 , extending from housing 12 , encloses a cleanout access 134 . cleanout access 134 allows for a tray 136 , supported by a tray support 138 to slide in and out with the aid of a handle 140 . a cleanout gasket 142 fits into a cap 144 ( threads not in drawing ), which when screwed to threaded protrusion 132 provides an airtight seal as gasket 142 is squeezed to a cleanout gasket seat 146 . in fig4 a we can see that tray support 138 starts just above the top outside edge of tray 136 and encompasses it such that it would be locked in place when cap 144 is attached . as the horizontal inside portion of tray support 138 terminates and begins ascending , a fly slide 148 begins . fig5 affords a straight down view of the interior of housing 12 . the fly slide 148 is not shown in fig1 for clarity in regard to other elements , but its outline is shown on the back wall of the housing in dashed lines at 148 in fig1 . the four interior walls of housing 12 comprise fly slide 148 , which originates at gasket seat 22 and converges as it deepens terminating to form an opening or a chute 150 . anything that falls within housing 12 would meet fly slide 148 and fall into tray 136 or would fall into tray 136 unobstructed . housing body 16 , along with the proper attachment of lid 14 , corridor 30 , housing plate 90 and cap 144 create an airtight cavity 19 in the housing &# 39 ; s interior ( airtight when em port 42 is energized ). the internal pressure of cavity 19 plays a key role as cpu 92 coordinates the events which will lead to the capture of a fly . three pressure ranges , which shall be called high , adequate and low are significant to this invention . these three pressure ranges are divided by two distinct pressure readings , optimal and sub - optimal . fig6 displays how these pressure ranges and reading are related . adequate is that range of negative pressure between , but not including , optimal and sub - optimal . all pressure readings within the range of adequate shall elicit no effect on the workings of this invention . that is , while the pressure reading is in the range of adequate , cpu 92 will not prompt any action to take place . high is a range of pressure readings of optimal and greater in negative pressure . low is that range of pressures that begin at sub - optimal and include readings of higher positive pressures . the range between high and low ( adequate ) is arbitrary and left to the manufacturer . likewise , pinpointing the exact values for optimal and sub - optimal is not pertinent to this description . these pressure values in effect represent a certain volume of air evacuated from cavity 19 . these volumes will depend in large part on the geometry of funnel 32 and the exact location of motion detector 50 ( addressed further in alternate embodiments ). in general , higher vacuum will be required as evacuated volume of the enclosure is made smaller , in order to produce reliably the rush of air required ( in velocity and volume ) to pull a fly into the interior . the critical measurement within the scope of this pressure scenario is that of sub - optimal . sub - optimal represents the least amount of evacuated air necessary to capture a fly , taking all variables into account . the user may opt to bait the device by placing an olfactory attractant into scent duct 58 prior to use or while the invention is in operation to further entice a fly into passageway 56 . the operation of this invention and the first situation finds the user plugging power plug 114 into an outlet and turning switch 102 to the on position ( i . e . first time use , fly trap device was moved , etc ). cpu 92 becomes charged and simultaneously energizes both em port 42 ( which makes cavity 19 now airtight ) and pressure sensor 94 . energized or activated , em port 42 forms a bond with door 38 , which shall be stronger than the force of optimal vacuum ( optimal representing the greatest negative pressure which will pull upon the door ). em port 42 is constantly charged and its current only interrupted when motion detector 50 is tripped ( more below , including variations ). pressure sensor 94 is relentlessly reading the internal pressure of cavity 19 and cpu 92 is continually checking this reading . naturally , in this case the initial reading will be the same as the pressure in the room , below sub - optimal or in the low vacuum / too - high pressure range . thus , cpu 92 engages pump 98 , which begins to evacuate air from cavity 19 . when enough air has been evacuated from cavity 19 so that the reading of optimal is attained , cpu 92 disengages air pump 98 and activates motion detector 50 and light attractant 46 . the invention is now ready to catch a fly . ideally no further air evacuation will be needed until a fly is caught , unless some air leakage occurs into the housing . because of the sensory attractants ( or light attractant or some other reason ), a fly passes through portal 34 and enters into passageway 56 . as the fly nears em port / door 36 it will come close to and trigger motion detector 50 , which alerts cpu 92 . this message prompts cpu 92 to momentarily interrupt the current to em port 42 , acting as a fly response means , and preferably also to disable motion detector 50 as well as light attractant 46 . with this momentary loss of power to em port 42 , door 38 succumbs to the negative pressure within cavity 19 and rapidly flips inwardly open on its hinges . air rushes in through passageway 56 to equalize the pressure of cavity 19 with that pressure surrounding the invention and carries the fly in with it . referring back to fig1 , a series of arrows represent the final flight path of the fly . the dotted lines at 25 represent the inverted triangular shape of the bottom of lid 14 , as it would rest after attachment . a fly block 26 r ( fig1 ) represents a spot on lid 14 which lines up with the center of passageway 56 . as the fly hurls into cavity 19 , it will ricochet off a spot proximate to fly block 26 r and end up in tray 136 . this brings us to the other situation , that of the trap &# 39 ; s resetting itself after capturing a fly . at this point motion detector 50 and light attractant 46 preferably have been disabled and power to em port / door 42 is now re - established along with its bond to door 38 . cpu 92 finds the enclosure pressure once again to be low vacuum ( too - high pressure ) and the above - described process begins again . note that the pressure sensor could be independently connected to the vacuum pump and not to a cpu , if desired . alternately this invention may be adapted and used to catch other pests such as mosquitoes , rodents or just about whatever bugs you in the realm of small animals . the word “ fly ” as used herein should be understood to include all such pests . multiple corridors referring back to fig1 , an “ x ” on the wall of housing 12 , opposite corridor 30 , marks an optional corridor spot 28 , the center of which would line up with a fly block 26 l . this is a possible location for a second corridor 30 . the complication which arises with the addition of a second corridor system ( or greater multitude ) is that of two flies simultaneously triggering the trap at two different corridors . the solution is a more advanced processor capable of differentiating the corridor and establishing a hierarchy whereby it would be constantly checking them in order such that only one corridor would in effect be active at any one given time . furthermore , if one motion detector was triggered the corresponding em port would react as described above and all motion detector and light attractants would be disabled until optimal was once again attained while maintaining the current to the rest of the em port / door systems . other arrangements can be implemented as well , such as simultaneous opening of two em ports when two flies are present , division of the housing space into separate vacuum compartments ( which could be with a single vacuum pump and one or more valves ), etc . the invention may be sold as a kit without the housing . a person may convert a 55 - gallon barrel or any such object which can be made airtight into a fly catching trap . alternate sources of power ( solar , battery , hand pump , etc .) may be utilized . the apparatus may be designed to take on any desired shape . the device may be produced in a color ( s ) which may be proven to attract the intended pest . the fly block could be a flat surface instead of angled and may be eliminated altogether . it also could be incorporated into the corridor ( or funnel ). the invention may be equipped with an external pressure gauge for visual reading . instead of having a string attached to the scent plug the end of the plug could be have a knob ( oversized ), it could have a screw - in design or some other convenient way of attachment . with the use of superior engineering or a material more malleable than hard plastic the need for gaskets may be eliminated . the lid and other attachments to the housing body may be attached via other methods ( snap devices , etc .). the fly may come to rest in some kind of disposable bag or device such that the user need not see the remains to dispose of them . novelties such as a fly counter , or the playing of a melody upon the capture of a fly or any other indicator of capture may be incorporated . an added safety feature may include a wire running inside of the finger guard , which would disable the invention should it be cut or broken . the device could be designed such that it would fail to operate if the lid were not attached . heat ( beyond that created by the light source ) may also be incorporated as an attractant to entice a fly to enter the passageway . if a light source is used , it is advantageously a source producing a particular wavelength of light to which flies are attracted . alternate means of attaching the em port to the funnel are possible ( heat , screws , etc .). the em port may be made part of the funnel . the interior portion of funnel 32 may be coated with a substance that will reduce the friction coefficient . the size and shape of the funnel may vary along with the position of the components . the device may be equipped with a spring or utilize some other method to aid in closing the door . the fly sensor 50 may be infrared , photo - sensor ( photodetector ), or radar or other fly presence sensor . at the moment a fly is detected and power to the magnet at the em port is interrupted , it is not necessary to disable power to the electric light attractment and the motion detector , since these elements will have no effect at this point . however , it is desirable to momentarily disable power to these elements , as well as the vacuum pump or pressure sensor , to conserve energy . switching off the light gives a visual indication of a trapping event . the cpu could be replaced by a simpler device such as a relay or other switch that interrupts power to the door closing device ( or powers it in the case of a motor ) when the sensor determines a fly is present . the vacuum pump or pressure sensor can similarly be disabled momentarily , although this is not absolutely necessary . the door preferably is open for a very short time , a fraction of a second , and the pump will not start to create any vacuum or air flow at the door opening prior to i . e . closing of the door . note also that the pump in this device could operate continuously , although this is generally not desirable because of economy of operation , noise and vibration . the ring magnet at the em port could be a different form of magnet , such as a bar electromagnet , coupled with an effective gasket around the port , although the ring shaped magnet is preferred . the magnet could be built into or onto the door , thus comprising a part of the door . also , another form of door latch and release could be utilized , such as a very small electric motor producing no discernable vibration . the door can be held and operated by any electromagnetic means , which includes a magnet , a solenoid , a motor or other electromagnetic device . a solenoid could withdraw a latch by direct or indirect mechanical connection , so as to release the door , then re - engage the latch when the door falls back to the closed position ; a wedging action can be included . in the case of a motor , after the air rush which draws in the fly , the motor could again be energized upon door closure to re - latch the door tightly . the term “ latch ” is intended to include any form of device to hold the door closed . the above described preferred embodiments are intended to illustrate the principles of the invention , but not to limit its scope . other embodiments and variations to these preferred embodiments will be apparent to those skilled in the art and may be made without departing from the spirit and scope of the invention as defined in the following claims .
a trap for flies or other small insects or pests has an enclosure in which is normally maintained a static vacuum . a small opening , preferably with a cone - shaped corridor leading to the opening , has a closure door which when released will swing open and admit a high - velocity rush of air that will draw a fly from the corridor into the enclosure . a fly sensor , such as a motion detector or photodetector , determines the presence of a fly and relays this information to a cpu or a simply relay , which sends a signal to release a latch on the door , allowing the door to swing open . the enclosure &# 39 ; s interior preferably includes an angled wall surface which the fly impacts at high enough speed to kill or stun the fly , and falls into a fly tray that can be pulled out for cleaning . a pest attractant such as a light or a smell attractant is included near the opening .