Compressed-air weapon with piston rod hook element and counter-hook engagement system
The invention relates to a compressed-air weapon. 
     Such a compressed-air weapon is known by way of example from Fed. German P.S. No. 900,427. 
     In the known device the trigger, the parts of the counter-hook-engagement system and the trigger return spring are fitted individually to the cylinder tube. This signifies that in the case of a defect in one of these parts these must be individually detached from the cylinder tube. Therefore as a rule a repair is possible only in the factory, but not in the gun shop. 
     The invention is based upon the problem of assembling a compressed-air weapon of this classification so that the repair-susceptible parts can be removed from the weapon and reinstalled in a simple manner, so that either they can be replaced in the gun shop or they can be detached from the remainder of the weapon, despatched to the manufacturing works, repaired there and then reinstalled in the weapon by the weapon dealer. 
     It is a special advantage of the solution according to the invention that the prefabricated construction unit can be kept in stock at the manufacturing works and also by the weapon dealer and in the case of an order for repair it is merely necessary to replace the defective construction unit by a construction unit kept in stock. This proceeds in the simplest manner because the small parts of the counter-hook-engagement system, the trigger return spring and possibly the small parts of the trigger safety catch system do not need to be detached from one another at all, but remain assembled in the construction unit. 
     It is furthermore a special advantage for the manufacturer and also for the weapon dealer that he can install the construction groups containing the counter-hook-engagement system, the trigger return spring and the trigger safety catch system, if provided, in different weapons, so that it is necessary to keep only one single type, or only a few types, of construction unit in stock, which can then be combined with the different weapons, with the use if necessary of adapter or liner pieces. 
     Further features of the invention appear in the following description. 
    
    
     The invention is explained by the accompanying Figures, wherein: 
     FIG. 1 represents a longitudinal section through the construction unit containing the counter-hook-engagement system, the trigger return spring and the trigger safety catch system, assembled with a cylinder tube and installed in a stock, the weapon being cocked and the safety catch set; 
     FIG. 2 represents a section along the line II--II in FIG. 1; 
     FIG. 3 represents a section corresponding to that in FIG. 1, the weapon again being cocked but the safety catch being released; 
     FIG. 4 represents a longitudinal section corresponding to that in FIG. 1, the weapon being again cocked and the safety catch released, but the trigger already having taken up first pressure under the action of a finger; 
     FIG. 5 shows a longitudinal section corresponding to that in FIG. 1, where the shot has just been projected and the trigger is still pulled back fully by the trigger finger; 
     FIG. 6 shows a longitudinal section corresponding to that in FIG. 1 after the shot has taken place and the trigger has been released; 
     FIG. 7 shows a view of the lock case holding the construction unit together, in the form of embodiment of the construction unit according to FIGS. 1 to 6; 
     FIG. 8 shows a longitudinal section through another form of embodiment of a construction unit; 
     FIG. 9 shows a preferred modification of FIG. 8, and 
     FIG. 10 shows an enlarged representation of a detail from FIG. 9. 
    
    
     In FIG. 1 the stock of the weapon is designated by 10. An axially extending cylinder tube 12 is secured on the stock. The stock 10 has a recess 10a extending vertically with respect to the axis of the cylinder 12. The cylinder tube 12 has a slot 12a in its periphery located within the stock recess 10a. The manner of securing will be discussed later. A construction unit designated quite generally by 13 is inserted into the cylinder tube 12. This construction unit 13 comprises a lock case 14, which is produced from a one-piece cut-out sheet metal shape and can be seen better from FIG. 7. The lock case 14 comprises a cylindrical lock case part 14a and, adjoining this, downwardly extending wall attachments 14b, 14c, and 14d. The cylinder lock case part 14a has a cylindrically closed forward section and a partially cylindrical rearward section with an opening 14b adjacent the slot 12a in the cylinder tube 12. The opening 14h has longitudinal edges 14i substantially parallel to the cylinder tube axis. Wall attachments 14c of the partially cylindrical rearward section extend downwardly from the edges 14i and define a lower lock case part 14c, 14b. The lower lock case part 14c, 14b passes through the slot 12a and are received in the recess 10a. The lower lock case part 14c, 14b engages at least one axially directed end face 10b, 10c of the recess 10a. The cylindrical lock case part is received along its total length in the cylinder tube 12 so that a rearward end of the partially cylindrical rearward section is adjacent the rearward end of the cylinder tube and the cylindrically closed forward section extends forwardly of the recess 10a. If indications of direction are given here, such for example as &#34;downwards&#34;, the assumption is always to be made that the weapon is set with the barrel in the horizontal direction and the trigger points vertically downwards. 
     In the case of the example according to FIG. 1 the cylindrical lock case part 14a is inserted through an adapter liner sleeve 15 into the cylinder tube 12, different adapter liner sleeves 15 or concentric groups of such adapter liner sleeves 15 being available or formable so that one and the same construction group 13 may be inserted into different cylinder tubes 12. The construction unit 13 is made fast in the cylinder tube 12 by two diametrical pins 16 and 17, in the axial direction of the cylinder tube; the diametrical pins 16 and 17 pass through aligned bores of the cylindrical lock case part 14a, the adapter liner sleeve 15 and of the cylinder tube 12. In this way the cylinder tube 12 and the lock case 14 are combined into a rigid assembly unit, which for its part is secured to the stock 10. As may be seen from FIG. 1, a threaded bolt 18 extending through the stock 10 is screwed into a threaded bore 19 of the cylindrically closed forward section of the cylindrical lock case part 14a and serves for the securing of this assembly unit. Moreover the cylinder tube 12 is screwed, in a manner not illustrated in FIG. 1, to the stock 10 by two further screws in the region of its forward end. As may be seen from FIG. 7, the cylindrical lock case part 14a is closed by a dovetail-type tongue and groove pairing 20, and thus stabilised. 
     As may be seen from FIG. 1, a piston rod 21 is accommodated in the cylinder tube 12. The piston rod 21 carries at its left end in FIG. 1 a piston (not shown) which together with the left end (likewise not shown) of the cylinder tube 12 forms a compression chamber. From the piston a piston tube united with the piston extends to the right; the right end of this piston tube is recognisable in FIG. 1 and is designated by 22. The piston rod 21 is surrounded by a guide sleeve 23 which is connected by crimping at its right end in FIG. 1 with a centering washer 24 and a piston spring support washer 25. The washer 24 is inserted into the cylindrical lock case part 14a. A piston spring 26 bears on the piston spring support washer 25 and presses with its left end (not shown in FIG. 1) against the piston. 
     At the right end of the piston rod 21 a hook element 28 with a hook engagement face 28a is formed by a milled-out portion 27. This hook element 28 can be held back against the action of the compressed piston spring 26 by a counter-hook-engagement system 29 pertaining to the construction unit 13. 
     The counter-hook-engagement system 29 includes a trigger insert 30 which is mounted pivotably about the diametrical pin 16. The axis of the diametrical pin 16 approximately intersects the axis of the piston rod 21. On the trigger insert 30 there is fitted a counter-hook element 31 which is in hook engagement in FIG. 1 with the hook element 28 in the region of the hook-engagement face 28a. 
     A trigger 32 is mounted pivotably on a bearing bolt 33 between the two parallel wall extensions 14c of the lock case 14. The bearing bolt 33 passes through a play-permitting opening 34 of the trigger insert 30, so that the trigger insert 30 is pivotable about the diameterical pin 16. 
     The trigger insert 30 has a window 35 in which a roll journal 36 seated on the trigger 32 engages with a certain play. A trigger return spring 37 which seeks to pivot the trigger 32 in the clockwise direction about the bearing bolt 33 acts upon the trigger 32. The trigger return spring 37 is supported on a lug 14e of the lock case 14. The roll journal 36 bears under the action of the trigger return spring 37 on the upper defining edge of the window 35 of the trigger insert 30. Thus the hook element 28 and the counter-hook element 31 are held in engagement with one another. Therefore the trigger insert 30 transmits the full spring force of the piston spring 26, which lies in the order of magnitude of 80 kp., to the diametrical pin 16. Since the axis of the diametrical pin 16 approximately crosses the axis of the piston rod 21, the hook-engagement face 28a lies substantially tangentially in relation to the axis of the diametrical pin 16 and the hook element 28 also lies substantially on the axis of the piston rod 21, the force of the piston spring 26 is taken up without substantial transverse forces in the construction unit. 
     It is seen that the bearing bolt 33 of the trigger 32 lies substantially in the middle of the length between the diametrical pin 16 and the roll journal 36 and that the roll journal 36 lies substantially vertically beneath the hook-engagement face 28a. Furthermore the bearing bolt 33 lies downwardly offset in relation to the piston rod axis 21. This selection of the system points has proved favourable with regard to a secure retention of the cocked piston rod 21 for the one part and to a trigger action with relatively slight shooting force upon the trigger 32 for the other part. This is of essential importance if it is considered that a force of 80 kp. must be transmitted between the hook element 28 and the counter-hook element 21 and that on the other hand the force on the trigger 32 must be kept slight in order to prevent wobbling of the weapon. 
     The play existing between the roll journal 36 and the window 35 permits of moving the trigger 32 in the anti-clockwise direction by the trigger finger without entraining the trigger insert 30 until the roll journal 36 comes to abut on the lower edge of the window 35. This movement play is called a &#34;first pressure take-up&#34;. One can also speak of a &#34;simulated pressure point&#34; where the roll journal 36 comes to abut against the lower edge of the window 35. 
     A trigger safety catch lever 39 carrying a manual actuation tag 40 at its upper end is further mounted pivotably about a bearing bolt 38 in the lock case 14. This manual actuation tag 40 extends through a cover member or lid 41 closing the rearward end of the partially cylindrical rearward section of the lock case 14 and of the cylinder tube 12, which lid is provided with an opening 42 for this purpose. A trigger safety catch stop 44 is mounted pivotably about a pivot spindle 43 on the trigger safety catch lever 39. An operating lever spring 45 simultaneously initially stresses the trigger safety catch lever 39 in the direction towards the edge of the sheet metal tab 14e and the trigger safety catch stop 44 in the direction towards an abutment edge 46 of the trigger safety catch lever 39. In FIG. 1 the trigger safety catch stop 44 of the trigger safety catch lever 39 stands opposite to a counter-stop 47 of the trigger 32, so that the trigger 32 cannot be pivoted in the anti-clockwise direction, thus trigger action is blocked and the weapon is set at safety. 
     For the initiation of the shot firstly the safety catch must be released; for this purpose the trigger safety catch lever 39 must be pivoted in the anti-clockwise direction about the bearing bolt 38, so that the trigger safety catch stop 44 is shifted out of the path of the pivoting of the counter-stop 47 of the trigger 32 about the bearing bolt 33. 
     The trigger safety catch lever 39 is connected through a peg 48 with an index spring 49. When the trigger safety catch lever 39 is pivoted in the anti-clockwise direction, a depression 50 of the index spring 49 comes to lie on the diametrical pin 16, as represented in FIG. 3, so that the trigger safety catch lever 39 is held in the position according to FIG. 3 against the action of the operating lever spring 45. 
     At this point it should be remarked that the trigger safety catch lever 39 is arranged and movable with its manual actuation element 40 in the longitudinal central plane of the weapon, so that it can be operated equally well by right-handed and left-handed persons. 
     It should further be remarked that the trigger safety catch lever 39 and the index spring 49 can be detached with a few manual actions, namely simply by removal of the lid 41, knocking out of the bearing bolt 38 and subsequent withdrawal of the trigger safety catch lever 39 with the trigger safety catch stop 44 and the operating lever spring 45 and the index spring 49. If thereafter a safety catch is not desired, this can be removed from the construction unit 13 after assembly, or conversely can be installed in this unit. 
     As soon as the trigger safety catch lever 39 has been put, as represented in FIG. 3, into the trigger release position, the trigger 32 can be pivoted according to FIG. 4 in the anti-clockwise direction, in which action the counter-stop 47 of the trigger 32 can move past the trigger safety catch stop 43 of the trigger safety catch lever 39. In FIG. 4 the condition is represented in which the trigger insert 30 is beginning to rotate in the anti-clockwise direction about the diametrical pin 16, so that the counter-hook element 31, overcoming the self-blocking existing until then, is beginning to unhook from the hook element 28. 
     In FIG. 5 the trigger insert 30 has been pivoted by the trigger 32 so far that the counter-hook element 31 has lifted away completely from the hook element 28 and the piston rod 21 has been pushed under the action of the piston rod spring 26 (FIG. 1) to the left, compressing the air in the above-mentioned compression chamber, whereupon the compressed air projects the shot through the barrel. 
     For the understanding of the further description of function now a particular constructional feature is to be discussed. 
     In the lock case 14 a blocking slider 51 is guided for displacement in the axial direction of the piston rod 21, namely due to the fact that, as visible from FIG. 2, the blocking slider 51 rests with cylindrically curved guide faces on the cylindrical lock case part 14 and on the other hand on the diametrical pins 16 and 17. 
     As may be seen from FIG. 2, a compression spring 52 is received for the one part by a slot 53 in the cylindrical lock case part 41a and on the other part by a crease 54 in the blocking slider 51. The blocking slider 51 is initially stressed to the left in FIG. 1 by the compression spring 52. A downwardly angled-off tag 55 of the blocking slider 51 is formed as a slideway sensor which co-operates with a slideway 56 on the upper edge of the trigger insert 30. The slideway 56 has an upper step 56a and a lower step 56b. 
     In FIG. 1 the slideway sensor 55 is held to the right against the action of the compression spring 52 by the shoulder 56c between the steps 56a and 56b. A window 57 allowing passage of the free end of the index spring 49 is arranged in the slideway sensor 55. 
     When, as represented in FIG. 5, the piston rod 21 has been released by the trigger 32 by means of the trigger insert 30, then the slideway sensor 55, as likewise visible from FIG. 5, has arrived over the slideway step 56a, so that on the subsequent release of the trigger 32, as represented in FIG. 6, the slideway sensor 55 initially prevents the pivoting of the trigger insert 30 up into the position as illustrated in FIG. 1, by action upon the slideway step 56a. 
     The condition as represented in FIG. 6 is that which is established after the shot has taken place and the trigger 32 has been released, before the weapon is cocked again. 
     When the weapon is cocked again, the piston rod 21 is shifted to the right against the action of the piston rod spring 26. The displacement of the piston rod to the right is effected for example by pivoting down of the barrel (not shown), through a cocking rod which articulatedly connects the barrel with the piston tube 22. 
     Now FIG. 6 shows that in the displacement of the piston rod 21 to the right in the course of the cocking operation the hook element 28 runs contactlessly over the counter-hook element 31. Only when the piston rod 21 strikes with its right end against the blocking slider 51 is the slide-way sensor 55 displaced with the blocking slider so far to the right, against the action of the compression spring 52, that the slideway sensor 55 can finally drop into the lower slideway step 56b, that is to say the trigger insert 30 can pivot in the clockwise direction under the action, communicated by the trigger, of the trigger return spring 37, so that the counter-hook element 31 comes into the hook engagement readiness position opposite to the hook element 28. When now the initiation of cocking, as by means of the tilting barrel, is ended, the piston spring 26 can relax somewhat again and the piston rod can return to the left until the hook element 28 comes to abut on the counter-hook element 31. 
     The length of the upper slideway step 56a thus determines the necessary past-cocking distance which is necessary so that the trigger insert 30 may be brought into hook engagement readiness at all. 
     It must be determined that due to the contactless passage of the hook element 28 over the counter-hook element 31, these elements, which are highly stressed by the great force of the piston initial-stressing spring 26, are subjected to protective treatment, which is of essential importance to the life of the weapon. 
     The necessary past-cocking distance, the occurrence of which was just derived from the presence of the slideway 56 and of the slideway sensor 55, is also of importance in as much as this past-cocking distance, in the cocking of the weapon, that is in the displacement of the piston rod 21 in FIG. 6 to the right, has the result that the piston rod 21 positively entrains the index spring 49 so far to the right that the trigger safety catch lever 39 is pivoted, by means of the index spring 49, again to the right into the trigger securing position according to FIG. 1. This signifies that in cocking the trigger safety catch lever 39 is positively brought every time into the trigger securing position according to FIG. 1. Once the weapon has been cocked and the trigger safety catch lever is in the trigger securing position according to FIG. 1, it is possible to pivot the trigger safety catch lever 39 into the trigger release position and back again into the trigger securing position as often as desired. 
     It is not possible to exclude the possibility of a marksman occasionally trying to cock the weapon while holding the trigger 32 fully pressed with the trigger finger, as represented in FIG. 5. If then the piston rod 21 arrives with its right end against the left end of the long leg of the index spring 49, the latter will seek to pivot the trigger safety catch lever 39 in the clockwise direction. If now the trigger safety catch stop 44 were fitted rigidly on the trigger safety catch lever 39, the pivoting of the trigger safety catch lever 39 would be blocked and either the cocking would be prevented or, if excessive force is used, destruction would occur. Since however now the trigger safety catch stop 44 can yield about the piston axis 43, against the action of the operating lever spring 45, pivoting of the trigger safety catch lever 39 around into the trigger securing position is possible, and then the trigger safety catch stop 44 pivots in again over the counter-stop 47 of the trigger 32 when the trigger 32 is released. Then the condition according to FIG. 1 is again reached. 
     The recoil necessarily occurring in shooting is introduced through the lock case 14 into the stock 10, namely through the wall extensions 14b and 14d, possible also the lid 41. Loading of the securing screws by the recoil is therefore largely precluded. A simulated pressure point is achieved by the play of the roll journal 36 in relation to the window 35. 
     All the functional parts, especially of the hook-engagement system 29 and of the safety catch system, which are difficult to fit and to handle are integrated into one single construction unit. 
     The diameterical pins 16 and 17 take over a multiple function: Firstly they constitute the connection of the lock case 14 with the cylinder tube 12, secondly they take over the guidance of the blocking slider 51 in the lock case 14. Thirdly the diametrical pin 16 takes over the bearing function for the trigger insert 30; fourthly the diametrical pin 16 takes over a snap engagement function in combination with the index spring 49. Fifthly the diametrical pin 16 takes over the function of a distance-limiting stop for the blocking slider 51, which has an abutment edge 58 opposite to the diametrical pin 16. 
     The installation of the diametrical pin 17 in the fitting of the construction unit in the cylinder tube is entirely uncritical. However the installation of the diametrical pin 16 can also be effected easily in that in the fitting together of the construction unit 13 an assembly pin is provided in place of the diametrical pin 16, and then in the installation of the construction unit into the cylinder tube in an appropriate device the assembly pin is replaced by the diametrical pin 16 which, while it is being driven in, expels the assembly pin before it. 
     In FIG. 8 analogous parts are provided with the same reference numerals as in FIGS. 1 to 7. 
     The counter-hook-engagement system is modified in comparison with the form of embodiment according to FIGS. 1 to 7. 
     The piston rod 21 is made at its right end with a rotation-symmetrical hook 60 which drives into a retaining sleeve 61 when the weapon is cocked. The rotation-symmetrical hook 60 then drives rolling bodies 62 through rolling body reception sockets 63 radially outwards into control slots 64 of a control sleeve 65. 
     In cocking, the control sleeve 65 is initially situated so far to the left that the control slots 64 are in coincidence with the rolling body reception sockets 63. As soon as the rotation-symmetrical hook body 60 has passed the rolling bodies 62, these can again approach, radially inwards, the narrowed shank of the piston rod 21, so that the control sleeve 65 can now be entrained, by means of a diametrical pin 66 passing through a slot 67 of the retaining sleeve, by the piston rod 21 advancing to the right. As soon as the control sleeve 65 has reached the position as shown in FIG. 8, a lock holder 68 drops with a lock holder nose 69 behind a retaining edge 70 of the control sleeve 65, so that the control sleeve is held back, against the action of the compression spring 71, in a position in which, as shown by FIG. 8, the control slots 64 are out of alignment with the rolling body reception sockets 63, thus the rolling bodies 62 effect a hook engagement of the retaining sleeve 61 with the rotation-symmetrical hook head 60. 
     The trigger 32 is mounted on the lock case by a bearing bolt 33 and engages with an engaging bolt 72 in a slot 73 of the lock holder 68. 
     At the beginning of the shooting movement of the trigger 32 about the bearing bolt 33 the trigger 32, through the engaging bolt 72 and the slot 73, takes the retaining nose 69 with its downwards initially only slowly, that is with small step-up, since the distance of the engaging bolt 72 from the bearing bolt 33 is very short. 
     However now a pressure point cartridge 74 is also fitted in addition on the trigger 32. This cartridge comprises an adjustable cartridge case 75 and a pressure bolt 76 displaceably mounted therein which is subject to the action of a compression spring 77. The pressure point spring 77 is set relatively hard. As soon as the pressure point bolt 76 comes against the abutment face 68a of the lock holder 68, the lock holder 68 is entrained with increased distance step-up, so that the slightest further movement of the trigger 32 suffices to bring the lock holder 68 with its retaining nose 69 out of the engagement with the retaining edge 70 of the control sleeve 65. An increased force corresponds to the greater distance step-up, and this increased force, which is necessary in order to rotate the trigger 32 further about the pivot bolt 33 and the lock holder 68 about its bearing bolt 78, represents the pressure point. 
     The trigger safety catch system works exactly as in the form of embodiment described above. 
     In the form of embodiment according to FIG. 8, since the retaining hook engagement is taken over by the rolling bodies 62, the abutment force between the lock holder nose 69 and the retaining edge 70 is slight, so that the trigger can be set finely sensitively. 
     It should also be pointed out that the arrangement according to FIGS. 1 to 7 and the arrangement according to FIG. 8 can be used according to choice in one and the same weapon. 
     In FIG. 9 there is represented a modification of FIG. 8. Analogous parts are designated with the same reference numerals as in FIGS. 1 to 8, each increased by the number 100. 
     The following differences from FIG. 8 are to be set forth: 
     The trigger 132 is initially stressed by a spring 180 into a rest position, which is determined by supporting of a support hook 181 on the tab (fixed stop) 114e. 
     Two co-operating hooks 182, 183 are mounted pivotably in the lock case 114 about associated pivot bolts 182a and 183a respectively, and a bush is provided on the pivot bolt 182a for better bearing mounting. The hook 182, since it co-operates directly with the trigger 132, will be designated as the first or trigger hook 182, while the other hook 183 is designated as the second or control-sleeve hook 183, because it co-operates directly with the control sleeve 165. THe trigger hook 182 is subject to the action of a spring 182b which bears on the tab 114e,  while the control-sleeve hook 183 is subject to the action of an operating lever spring 183b. Each hook is loaded by the respective spring in the counter-clockwise direction. 
     In FIG. 9 the weapon is cocked. The piston rod 121 is held fast in its cocked position by the rolling bodies 162 against the action of the helical compression spring 126, the rolling bodies 162 being pressed inwards in the rolling body reception sockets 163 of the retaining sleeve 161 by the control sleeve 165 so far that the rolling bodies 162 secure the hook body 160 against a movement to the left in FIG. 9. The head portion or hook body 160 is fixed to the rearward end of the piston rod 121 by a neck section 160a. The retaining sleeve 161 is coaxial with the cylinder tube 112 and is fixed axially with respect to the cylinder tube. The control sleeve 165 surrounds the retaining sleeve and is axially slidable therein. The control sleeve 165 has an axially extending full or imperforate section and an axially extending perforate section containing a plurality of control slots 164. The full section of the control sleeve 165 covers the reception sockets 163 in the retaining sleeve 161 in the retaining position where the rolling bodies 162 are held in the neck section 160a.  Further, the control sleeve 165 is secured in the position as shown in FIG. 9, in which it secures the rolling bodies 162 against radial outward deviation, against deviation to the left under the action of the helical compression spring 171 by the fact that a blocking nose 183c rests with its right, inclined flank against a correspondingly inclined flank 165b at the edge of a piercing 165a of the control sleeve 165. The spring biases the control sleeve toward a non-retaining position in which the control slots 164 are in substantial radial alignment with the reception sockets 163. The sleeve hook 183 is secured in this blocking position in that a support face 182c of the trigger hook 182 rests on a counter-support face 183d of the control-sleeve hook 183. The sleeve hook 183 is rockable about an an axis 183a fixed with respect to the cylinder tube. The sleeve hook 183 has a wedge-shaped retaining flank 183c engageable with a counter-retaining flank 165b on the control sleeve 165. The trigger hook 182 on the other hand is secured in this support position by the spring 182b, and this readily suffices because the support force generates practically no moment about the pivot bolt 182a. The trigger hook is rockable about a trigger hook axis defined by pivot bolt 182a stationary relative to the cylinder tube 112, and parallel with the sleeve hook axis defined by pivot bolt 183a. The trigger hook 182 has a lever arm. 
     If, starting from the cocked position of the weapon according to FIG. 9, the trigger 132 is pressed, the trigger 132 rotates in the anti-clockwise direction about the pivot bolt 133 which is stationary relative to the cylinder tube 112 and the trigger hook 182 is pivoted, by means of the first pressure stop 172 in contact with the trigger hook lever arm, in the clockwise direction about the pivot bolt 182a against the action of the helical compression spring 182b. This pivoting movement of the trigger hook 182 in the clockwise direction is greatly stepped down by the fact that the first pressure stop 172 lies quite close to the pivot bolt 133. Accordingly the support face 182c slides only quite slowly over the counter-support face 183d. Only when the pressure point stop 174 has come to abut against the trigger hook 182 and the trigger 132 is pressed further does an accelerated movement of the support face 182c in relation to the counter-support face 183d occur with the increase of resistance (pressure point), so that the support face 182c and the counter-support face 183d depart from one another. The remaining overlap between the support face 182c and the counter-support face 183d, which is still to be travelled when the pressure point stop 174 has once come against the trigger hook 182 is responsible for the moment of entry and the fine sensitivity of the pressure point. The shorter is this remaining overlap, the later does the pressure point come, that is the more finely sensitive is it. The stop 172 is located at a longer distance from the trigger hook rocking axis 182a than the other stop 174. The fine sensitivity can be adjusted by adjustment of the two stops, the first pressure stop 172 and the pressure point stop 174. A first connection line connects the trigger hook rocking axis 182a and the support face 182c. A second connection line substantially perpendicular to the first connection line connects the sleeve hook rocking axis 183a and the counter-support face 183d of the sleeve hook 183. 
     As soon as the counter-support face 183d is liberated from the support face 182c, the sleeve hook 183 can be pivoted by the control sleeve 165, by means of the oblique flanks 183c and 165b, against the action of the operating lever spring 183b in the clockwise direction about the pivot bolt 183a, so that the nose 183c liberates the flank 165b of the piercing 165a and accordingly the control sleeve 165 can spring to the left under the action of the helical compression spring 171. The flank 183c of the sleeve hook 183 has a smaller distance from the sleeve hook rocking axis 183a than the trigger hook support face 182c. Then the control slots 164 come into the region of the rolling body reception sockets 163, so that the rolling bodies 162, for example three at 120° intervals, can move radially outwards and actually are also pressed outwards by the hook body, the piston rod 121 then following to the left with the piston (not shown) under the pressure of the cocked piston spring 126, whereby the shot is projected in the manner as described above. 
     When the control sleeve 165 moves to the left under the action of the helical compression spring 171, the nose 183c places itself in engagement with a face 165c of the control sleeve 165 and the trigger hook 182, after releasing the trigger 132, places itself under the action of the spring 182b with the face 182e in frictional engagement on the end edge 183e. 
     When after the shot has taken place, the piston rod 121 is pushed back to the right in renewed cocking, firstly the hook body 160 runs over the rolling bodies 162, which yield radially outwards into the control slots 164, and then comes to abut on the past-cocking path against the diametrical pin 166. On continuation of the past-cocking travel of the piston rod 121 the diametrical pin 166 is entrained to the right and with it the control sleeve 165, which is connected with it for common axial movement. The movement of the control sleeve 165 to the right takes place against the resistance of the helical compression spring 171. Then an end edge 165d of the control sleeve 165 comes into engagement with a stop face 182f of the trigger hook 182, so that the latter is pivoted in the clockwise direction about the pivot bolt 182a against the action of the helical compression spring 182b. This pivoting of the trigger hook 182 in the clockwise direction during the past-cocking travel of the control sleeve has the consequence that the face 182e disengages itself from the right end edge 183e of the sleeve hook 183 and then this sleeve hook 182 can pivot under the action of its operating lever spring 183b in the anti-clockwise direction again and its blocking nose 183c can enter the opening 165a. The control sleeve 165 goes back to the left as soon as, after the ending of the cocking operation, the hook body 160 is allowed to go back to the left by the past-cocking distance. Before the flank 165b comes to strike upon the blocking nose 183c the support face 182c engages under the action of the helical compression spring 182b under the counter-support face 183d. Thus the condition of the cocked weapon as shown in FIG. 9 is restored. 
     It is to be noted that the support face 182c and the counter-support face 183d lie vertically above the joint bolt 182a. This is essential so that the support face 182c and the counter-support face 183d can slide past one another in shooting, without the occurrence of a pivoting movement of the sleeve hook 183. This is of essential importance for an easy and thus finely sensitive trigger action. 
     For the understanding of the significance of the form of embodiment according to FIG. 9 reference is now made to FIG. 10: there it is seen that under spring stress the hook body 160, by way of the rolling bodies 162 and a slightly inclined oblique face 165e of the control sleeve 165, generates a force component upon the control sleeve 165 which superimposes itself upon the force of the helical compression spring 171. Since the stress force due to the spring 126 acting upon the piston rod 121 is very great, a relatively great force also acts upon the control sleeve 165 seeking to draw this to the left when the weapon is cocked. This force is taken up by the co-operation of the flanks 183c and 165b, further by the co-operation of the support face 182c and the counter-support face 183d, which co-operation is ensured by the spring 182b. 
     The resistance which the trigger 132 opposes to the finger acting upon it depends substantially upon the sliding resistance generated by the faces abutting on one another, support face 182c and counter-support face 183d. This resistance force is small, firstly because the location of the support face 182c and of the counter-support face 183d is substantially more remote (about twice as far) from the pivot point 183a than the nose 183c, so that the support force between the support face 182c and the counter-support face 183d is small. Secondly in the pivoting of the hook 182 the hook 183 does not need to be moved, on account of the special position of the support face 182c and of the counter-support face 183d in relation to the pivot bolt 182a. Thirdly there is the fact that the first pressure stop 172 acts at a very short distance from the pivot bolt 133. All this causes an easy pull to the pressure point. However even after the pressure point is reached, when the pressure point stop 174 acts on the hook 182, the resistance of the trigger 132 opposing the finger is as slight as desired. For this purpose it is only necessary to select the transmission ratio of the hook 183 appropriately, that is to enlarge the distance of the support face 182c and the counter-support face 183d from the pivot bolt 183a compared with the distance of the nose 183c from the pivot point 183a. 
     The invention permits of providing an easy-moving and finely sensitive, regulable trigger pull, necessary for exact aiming, even in compressed-air weapon of high shot energy, that is with strong cocking spring 126. 
     It is also to be noted that in all manipulations of the weapon the trigger 132 remains at rest, with the exception of the trigger-pulling action in which the finger of the marksman acts upon the trigger.