CA1080067A - Cartridge mechanism for gas fired guns - Google Patents
Cartridge mechanism for gas fired gunsInfo
- Publication number
- CA1080067A CA1080067A CA291,288A CA291288A CA1080067A CA 1080067 A CA1080067 A CA 1080067A CA 291288 A CA291288 A CA 291288A CA 1080067 A CA1080067 A CA 1080067A
- Authority
- CA
- Canada
- Prior art keywords
- lever
- cartridge
- gas
- frame
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B11/00—Compressed-gas guns, e.g. air guns; Steam guns
- F41B11/60—Compressed-gas guns, e.g. air guns; Steam guns characterised by the supply of compressed gas
- F41B11/62—Compressed-gas guns, e.g. air guns; Steam guns characterised by the supply of compressed gas with pressure supplied by a gas cartridge
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Abstract of the Disclosure .
Disclosed is a gas fired gun including a frame, a barrel carried by the frame, a chamber for receiving a gas-filled cartridge, a trigger mechanism, and a valve having a piercing member at one end of the chamber whereby actuation of the trigger mechanism momentarily opens the valve causing a charge of gas from the cartridge to propel a BB shot through the barrel. A loader assembly for the gas-filled cartridge includes a cam rod at the opposite end of the chamber from the piercing member, a lever, and cooperating cam surfaces carried by the lever and the rod whereby the rod is moved toward the piercing member to engage and puncture the cartridge against the piercing member upon movement of the lever toward the frame. The cam surfaces also cooperate such that the gas pressure developed by the cartridge and the bias of the cam tend to maintain the lever in a chamber closed position when the lever lies flush along the underside of the frame.
Disclosed is a gas fired gun including a frame, a barrel carried by the frame, a chamber for receiving a gas-filled cartridge, a trigger mechanism, and a valve having a piercing member at one end of the chamber whereby actuation of the trigger mechanism momentarily opens the valve causing a charge of gas from the cartridge to propel a BB shot through the barrel. A loader assembly for the gas-filled cartridge includes a cam rod at the opposite end of the chamber from the piercing member, a lever, and cooperating cam surfaces carried by the lever and the rod whereby the rod is moved toward the piercing member to engage and puncture the cartridge against the piercing member upon movement of the lever toward the frame. The cam surfaces also cooperate such that the gas pressure developed by the cartridge and the bias of the cam tend to maintain the lever in a chamber closed position when the lever lies flush along the underside of the frame.
Description
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The present invention relates to a gas fired gun having a chamber for receiving a gas-Eilled cartridge and particularly relates to a novel and improved loading and extraction assembly which facilitates safe retention of the gas cartridge in the chamber.
Conventional gas fired guns utilize a cartridge containing gas under high pressure as the propellant charge for firing a BB shot from the gun. In certain guns , the cartridge is inserted in-to a bore and a plug is threaded into the boxe to displace the cartridge against a piercing member or point at the opposite end of the bore. Should a non-spent cartridge be removed while unthreading the plug, the cartridge may propel itself from the gun with possible consequent injury to the individual using the gun. Other guns prevent ~15 the cartridge from being expelled under its own propulsive force. Such guns usually provide a lever which cams a rod .~ into engagement with the gas cartridge in the gun chamber.
Slight displacement of the lever rom its fully closed position, however, may cause the cartridge, under the force of the gas ~20 esaaping it, to move the lever toward a cartridge release position opening the chamber. That is, the force of the gas esaaping from~the oartridge may bias the lever toward its , release position with consequent loss of gas and possible resultant injury~ln;the event the cartridge drops or is propelled from the~chamber while gas is escaping.
The~present invention provides a gas fired gun havlng a no~el and improved loader and~extractor assembly which , ~ ~
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minimizes or eliminates the foregoing and other problems associated with gas cartridge loader and extractor assemblies or prior gas fired guns and provides a novel and improved loader and extractor assembly for a gas fired gun having various advantages in construction, operation and use in comparison with such prior loader and extractor assemblies.
Particularly, the present gas fired gun is provided ~ith a novel and improved gas cartridge loader and extractor assembly having improved safety features whereby the lever is automatically biased into a position tending to close the chamber containing the gas cartridge. Thus accidental or inadvertent movement of the lever from its closed position is resisted both by force of the gas being expelled from the gas cartridge and the bias of the loader cam rod. The loader and extractor assembly also provides a new and improved filtering arrangement in which the gas car-tridge moves slightly to provide a filtering action to remove such ... ~ .
impurities or foreign matter as may be present at the mouth of the pierced gas cartridge. The assembly may also be partially opened to allow inspection of the gas cartridge and to determine whether pressurized gas remains in the cartridge.
More particularly, the gas fired gun in which the novel and improved loader and extractor assembly of the present invention is provided comprises a frame carrying a barrel, a chamber for receiving a gas filled cartridge, a trigger mechanism,~
and a valve assembly having a piercing member at one end of the cartridge chamber whereby gas from the cartridge is supplied to the valve assembly. Upon actuation of the trigger, the valve is momentarily opened to release a charge of gas which serves to pro-peL or fire a BB shot from the gun barrel. The :Loader and ex-tractor assembly hereof includes a cam rod, a ca~ block carried bythe cam rod at the opposite end of the cartridge chamber from the piercing member, and a spring about the cam rod for biasing it for
The present invention relates to a gas fired gun having a chamber for receiving a gas-Eilled cartridge and particularly relates to a novel and improved loading and extraction assembly which facilitates safe retention of the gas cartridge in the chamber.
Conventional gas fired guns utilize a cartridge containing gas under high pressure as the propellant charge for firing a BB shot from the gun. In certain guns , the cartridge is inserted in-to a bore and a plug is threaded into the boxe to displace the cartridge against a piercing member or point at the opposite end of the bore. Should a non-spent cartridge be removed while unthreading the plug, the cartridge may propel itself from the gun with possible consequent injury to the individual using the gun. Other guns prevent ~15 the cartridge from being expelled under its own propulsive force. Such guns usually provide a lever which cams a rod .~ into engagement with the gas cartridge in the gun chamber.
Slight displacement of the lever rom its fully closed position, however, may cause the cartridge, under the force of the gas ~20 esaaping it, to move the lever toward a cartridge release position opening the chamber. That is, the force of the gas esaaping from~the oartridge may bias the lever toward its , release position with consequent loss of gas and possible resultant injury~ln;the event the cartridge drops or is propelled from the~chamber while gas is escaping.
The~present invention provides a gas fired gun havlng a no~el and improved loader and~extractor assembly which , ~ ~
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minimizes or eliminates the foregoing and other problems associated with gas cartridge loader and extractor assemblies or prior gas fired guns and provides a novel and improved loader and extractor assembly for a gas fired gun having various advantages in construction, operation and use in comparison with such prior loader and extractor assemblies.
Particularly, the present gas fired gun is provided ~ith a novel and improved gas cartridge loader and extractor assembly having improved safety features whereby the lever is automatically biased into a position tending to close the chamber containing the gas cartridge. Thus accidental or inadvertent movement of the lever from its closed position is resisted both by force of the gas being expelled from the gas cartridge and the bias of the loader cam rod. The loader and extractor assembly also provides a new and improved filtering arrangement in which the gas car-tridge moves slightly to provide a filtering action to remove such ... ~ .
impurities or foreign matter as may be present at the mouth of the pierced gas cartridge. The assembly may also be partially opened to allow inspection of the gas cartridge and to determine whether pressurized gas remains in the cartridge.
More particularly, the gas fired gun in which the novel and improved loader and extractor assembly of the present invention is provided comprises a frame carrying a barrel, a chamber for receiving a gas filled cartridge, a trigger mechanism,~
and a valve assembly having a piercing member at one end of the cartridge chamber whereby gas from the cartridge is supplied to the valve assembly. Upon actuation of the trigger, the valve is momentarily opened to release a charge of gas which serves to pro-peL or fire a BB shot from the gun barrel. The :Loader and ex-tractor assembly hereof includes a cam rod, a ca~ block carried bythe cam rod at the opposite end of the cartridge chamber from the piercing member, and a spring about the cam rod for biasing it for
-2-~08~067 movement in a direction away from the piercing member. A lever is pivoted below the cam rod and caL-ries a cam surface for ; , cooperation with a cam surface carried by the cam block. Par-ticularly, the lever is pivotable between a position projecting outwardly, i.e. downwardly, from the gun stock and a position flush along the underside of the stock and closing the chamber containing the gas cartridge. 'During movement from the lever's outwardly projecting position toward an intermediate position, the cooperating cam surfaces on the lever and block move the cam rod against the bias of the spring to displace a cartridge in the chamber against the piercing member at the opposite end of the chamber from the cam block. As the cartridge moves, the piercing member pierces a sealing diaphragm at the mouth end of the gas cartridge. Maximum penetration of the piercing member oacurs as the cartridge reaches the limit of its movement, and in this momentary condition, the pierced cartridge is effectively sealed against gas escape. Thereafter, the gas cartridge re- ' treats slightly, owing to the shape of the driving cam surfaces, , in order to establish a gas gap or passage be,tween the end seal diaphragm and the piercing member. The gas cartridge in this osition is in fl,uid communication with the firing valves.
Importantly, when the lever is in a position between its intermediate and flush positions, the cam surfaces cooperate to bias the lever toward its flush position in response to any movement of the gas cartridge toward the cam rod. That is, the propulsive force of the gas escaping from the cartridge uring use of the gun or any slight opening of the chamber by Inadver~en vemene of the lever from it- flush position
Importantly, when the lever is in a position between its intermediate and flush positions, the cam surfaces cooperate to bias the lever toward its flush position in response to any movement of the gas cartridge toward the cam rod. That is, the propulsive force of the gas escaping from the cartridge uring use of the gun or any slight opening of the chamber by Inadver~en vemene of the lever from it- flush position
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tends to bias the lever toward its flush position maintaining the chamber fully closed. Also, when the lever lies between its flush position and the intermediate position~ the cam surfaces cooperate to bias the lever toward its flush position under the applied bias of the cam rod spring. Consequently, the lever will move to its flush position closing the chamber when moved past its~
intermediate position thereby automatically closing the cartridge chamber.
Accordingly, it is a primary object of the present inven-tion to provide a gas fired gun having a novel and improved gascartridge loader and extractor assembly.
Another object of the present invention is to provide a gas cartridge loader and extractor assembly which provides for filtering gas flow from the cartridge into a firing valve system.
It is another object of the present invention to provide a gas fired gun having a novel and improved gas cartridge loader andl , extractor assembly having improved safety characteristics during use.
It is still another object of the present invention to pro-vide a novel and improved gas fired gun wherein a lever type action is provided for the loader and extractor assembly in which the lever is biased into a position closing the gas cartridge chamber.
;~ It is a further object of the present invention to provide , ~1 a novel and improved gas cartridge loader and extractor assembly which provides for improved flo- of the gas from the cartridge to the valve assembly.
These and further objects and advantages o the present invention will become more apparent upon reference to the ~ following specifiaation, appended claims and drawings wherein:
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. , FIGURE 1 is a side elevational view of a gas fired gun having a gas cartridge loader and extractor assembly constructed in accordance with the present invention;
FIGURE 2 is an enlarged fragmentary vertical cross-sectional view through the gun of Figure l;
FIGURE 3 is a fragmentary perspective view of the gun with parts broken out of the receiver or frame and further illustrating the novel and improved loader and extractor assembly of the present invention;
FIGURE 4 is a fragmentary perspective view of the underside of the gun illustratlng the cartridge receiving chamber along the underside of the stock and part of the loader and extractor assembly hereof in the chamber open and . cartridge loading position; .
; 15 FIGURE 5 is a view similar to Figure 4 illustrating the , gas cartridge disposed within the chamber and the chamber : partially closed; .
, . FIGURE 6 is an enlarged vertical cross-sectional view illustrating the cartridge within the closed chamber and the loader and extractor assembly in its position when the gun is ready for~firlng;
FIGURE 7 is an enlarged fragmentary vertical cross-: sectional view:o~f the cartridge chamber and part of the : :loader and extractor assembly upon initiaL insertion of a cartridge into the chamber; ~ ~
I ~ ~ FIGURE 8 is a view similar to Figure 7 illustrating ~- the position of the various parts of the loader ,and extractor : :: . ~:
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10~10067 assembly with the lever thereof in an intermediate partially . closed position; and FIGURE 9 is a view similar to Figure 7 illustrating the lever in a fully closed position with the gas cartridge . 5 backed off the piercing member.
: Referring now to the drawings, particularly to : Figures 1-2, there is illustrated a gas fired gun generally designated 10 comprised of a frame 12 having a ¦ forearm stock 14, a shoulder stock 16, a trigger mechanism generally designated 18 including a trigger 20, a barrel 22 within a shroud 24, a magazine tube 26 below barrel shroud 24, and front and rear sights 27 and 28 respectively on shroud 2~.
¦ Gu~ 10 is provided with a gas cartridge C which supplies gas under pressure to a valve assembly 30 for firing individual BB shot transferred from magazine tube 26 by a loader or transfer I . mechanism 32 to a position in line with barrel 22.
:.~ A brief description of the trigger mechanism, valve l assembly and shot transfer mechanism and their operation will :l . now be provided to facilitate understanding of the overall operation of the gun and the loader and extractor assembly thereof respectively. Trigger assembly 18 includes a safety : lever 40, a safety latch 42, a generally U-shaped trigger element 44 forming an upper extension of trigger 20 and pivotally carrying a sear 46, and a hammer 48 biased by spring 50 for pivotal movement about shaft 52 into engagement with a valve firing pin 54. Trigger:element 44 is carried for .
: pivotal movement about a pin 49. A loader:lever 56 is ~ pivotally c-rrled at 58 and has a kidney chaped opening 60 ,; . - 6 - : :
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- ~080(~7 receiving the sear pivot pin 62. The safety latch 42 is pivoted about pin 64 and safety lever 40 is pivoted about post . 66.
: Valve assembly 30 and transfer mechanism 32 are best illustrated in Figure 7. Valve assembly 30 includes a stem 70 : carrying a firing pin 54. The upper end of stem 70 seats against the valve housing. Stem 70 is polygonal in cross section and is biased into sealing engagement against the valve housing by a spring 72. A passage 74 lies in communication with the gas in cartridge C at one passage end through a piercing assembly generally designated 76 and a valve chamber 78 at its opposite end.. Passage 80 lies in communication with valve chamber 78 on the other side of the valve seal and lies in communication j with barrel 34.
Piercing assembly 76 includes a piercing cone 82 retained within a bore 84 on valve assembly 30 by a piercing ; cone retainer washer 86. A piercing seal 88 is retained in the bore ~4 by a retaining nut 90. Thus, it will be appreciated ::
that piercing assembly 76 provides a piercing cone 82 for ,. ~20 ~ puncturing the end seal 92 of the cartridge C.~
I ~ : : When the gas cartridge C is in the chamber 68 formed along the underslde~of:frame 12 and ln operative positlon with gas flowing~therefrom past the piercing assembly 76 into.valve assembly 30, the gun is ready for firing. To fire the gun , the:~safety~lever 40 is advanced about post 66 to the:fire position~releasing the trigger mechanism 18 for ..
: ~iring the gun.. This rotates safety latch 42 in counter-clockwise direction as seen in Figure 2 releasi.ng trigger bar ~ .
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45 from engagement with a catch 47 on safety latch 42.
; Squeezing trigger 20 causes sear 46 to engage hammer 48 and pivot it about pivot 52 to a cocked position against the bias of spring 50 and spaced from firing pin 54. Upon further pivotal movement of trigger 20, sear 46 drops off hammer 48 and spring 50 retracts hammer 48 against pin 54 momentarily ¦
depressing the latter. By depressing pin 54, a charge of gas from cartridge C communicates through passages 74, 78 and 80 in ; val~e assembly 30 to a location behind the BB shot in transfer arm 32 whereupon the BB is fired or propelled through barrel 22.
Referring now to Figures 3 and 6, there is illustrated a loader and extractor assembly, generally designated 98, for loading the gas cartridge C into chamber 68 and extracting it therefrom. Particularly, assembly 98 includes a cam rod 100 having a diametrically enlarged shaft portion 102 slidable in a guide 104. A reduced diameter shaft portion 106 of cam rod 100 is slidable in a guide 108. Each of guides 104 and 103 is carried by frame 12. The rearmost end of cam rod 100 carries a head 110, having a concave 111 rearmost face conforming in shape to the bulbous forward end or nose of gas cartridge C. Concave face 111 centers and retains the forward end of the gas cartridge. The opposite end of cam rod 100 is e~compassed by a spring 112. Spring 112 bears at one end against guide 108 and at its opposite end against a retainer ~- 25 washer 114 carried by cam rod 100. Spring 112 biases cam rod 100 for sliding movement in an axial direction away from piercing assembly 76.
To provide for insertion, retention and removal of ~ .
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. gas cartridge C relative to chamber 68, an elongated lever 116 is pivotally carried on a pin 118 secured to frame 12.
The rearmost end of lever 116 carries a tip 120 which projects slightly downwardly below the underside of frame 12 when the lever 116 lies flush along the frame closing chamber 68 whereby the lever can be grasped and pivoted downwardly~ for example to the position illustrated in Figure 4. The forward end of lever 116 is provided with a pair of cam surfaces 122 which straddle the reduced diameter portion 106 of cam rod 100. Cam surfaces 122 bear against a cam block 124 carried by rod 100 intermediate the diametrically enlarged and reduced shaft portions 102 and 106 respectively. Cam block 124 is stepped along the side margins of its forward face to provide shoulders 126. The lower edges of shoulders 126 are tapered rearwardly to form entry cam surfaces 128. Cam surfaces 122 on lever 116 have high portions or tips 130 for reasons which become clear from the ensuing description. Lever 116 also has a pair of flats 131 contiguous to cam surfaces 122.
Referring no~ to Figures 4 and 7, it will be seen that lever 116 is pivoted about pin 118 to a position where it projects substantially at right angles from the underside of frame 12. By pivoting lever 116 outwardly away from frame 12, the cam surfaces 122 are displaced forwardly away from shoulders 1~26 on cam block l?4 enabling spring 112 to bias cam rod 100 axially forwardly with cam block 124 in following engagement with cam surfaces 122 and ultimate bearing against flats 131 as illustrated in Figure 7. ~his enlarges chamber ~1 _ 9 _ .
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¦ 68 in an axial direction enabling insertion of cartridge C, as l illustrated in Figures 4 and 7, into chamber 68. This cartridge, ¦ as illustrated in Figure 7, is dropped into chamber 68 and ¦ its reduced end is disposed within the bore of piercing assembly.
Lever 116 is then rotated or pivoted back from this first described position projecting from the underside of the gun -to an intermediate or second position illustxated in Figures 5 and 8. During this movement, cam surfaces 122 cam against shoulders 126 of the cam block and displace cam rod 100 and cartridge C axially rearwardly toward piercing assembly 76.
Movement of cartridge C rearwardly forces the cartridge cap or seal against piercing cone 82 and the cartridge cap is thus pierced. When the lever 116 lies in its intermediate position, i the cartridge C is advanced toward the piercing assembly such that the margins of the cartridge about its cap depress the seal 88 as illustrated in Figure 8. Also, the high points 130 of lever 116 have moved along entry cam surfaces 128 on cam block 124.
Movement of lever 116 from its intermediate position illustrated in Figure 8 to its third position wherein it lies flush against the underside of frame 12 causes the high points 130 to bear against shoulders 126 on cam block 124. Further f:~ : : :
movement of lever 116 toward its~flush position moves high polnts 130 along an arc away from cam block 124.Thus, cam I ~ block 124 moves axialIy forwardly under the~blas o spring 112 in foIlowing engagement with high points 130 whereby the rear-ward force on the cartridge is relieved enabling the cartridge to back off the piercing cone 82 as illustrated in Figure 9 . , ' ~
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~ 080067 to a limited extent to define a gas passage small enough to act as a filter against entry of impurities from the cartridge into $he valve. This facilitates flow of gaLs from cartridge C about piercing cone 82 and into the passageway 74. Simultaneously, the margins about the pierced cap of cartridge C retain their sealing engagement against the resilient piercing seal 88.
Advantageously, high points 130 of cam surfaces 122 obtain an overcenter position when bearing against shoulders 126 and particularly upon initial movement of lever 116 from its intermediate position toward its flush posit:ion.
The forward bias of cam rod 100 under the bias of spring 112 and against flat shoulders 126 acts on the high points 130 along a line above the lever pivot 118. Consequently, the spring action and the force of the sealing gasket on the gas cylin der tends to rotate or bias the lever for rotation in a clockwise direction as illustrated in Figure 8. Thus, lever 116 is biased into a position flush against the underside of the frame. Also, any propulsive force generated by the gas escaped from the car-tridge in the chamber biases lever 116 in a like direction, Thus, slight movement of the lever outwardly from its position along the underside of the frame is counteracted by the spring force, the gasket force, and any propulsive ~force generated by the gas escap-ing the cartridge when in the chamber tends to maintain the chamber closed.
1 25 To extract cartridge C from chamber 68, the lever is slowly moved from its third or flush position through its intfffrmediate or second position into the first position pro-jecting from the underside of the gunO This enables escape of substantially all of the gas before the lever passes through f - 11 -1~18~6~
the original position.
It will be appreciated that accidental or inadvertent movement of the lever from its flush position toward its inter-mediate position and release thereof will result in automatic return of the lever to the flush position through the interaction of the cam surfaces, the bias of the spring 112, the gasket 88, and the propulsive force resulting from the gas under pressure in cartridge C. That is, the cam surfaces on the lever and the shoulders in the cam block cooperate such that the lever moves overcenter intermediate its extremes of rotation, i.e. pro}ecting : , .
outwardly from the underside of the gun and lying flush along the underside of the gun. Thus, the action of the spring and the pro-pulsive force of pressurized gas serve to retain the lever in its flush position closing the chamber 68 containing cartridge C. It should be noted that gas will not escape to the atmosphere until after the lever passes the intermediate position.
The invention may be embodied in other specific forms ,A~ without departing from the spirit or essential characteristics ~! ~ thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the ~oregoing desaription, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
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tends to bias the lever toward its flush position maintaining the chamber fully closed. Also, when the lever lies between its flush position and the intermediate position~ the cam surfaces cooperate to bias the lever toward its flush position under the applied bias of the cam rod spring. Consequently, the lever will move to its flush position closing the chamber when moved past its~
intermediate position thereby automatically closing the cartridge chamber.
Accordingly, it is a primary object of the present inven-tion to provide a gas fired gun having a novel and improved gascartridge loader and extractor assembly.
Another object of the present invention is to provide a gas cartridge loader and extractor assembly which provides for filtering gas flow from the cartridge into a firing valve system.
It is another object of the present invention to provide a gas fired gun having a novel and improved gas cartridge loader andl , extractor assembly having improved safety characteristics during use.
It is still another object of the present invention to pro-vide a novel and improved gas fired gun wherein a lever type action is provided for the loader and extractor assembly in which the lever is biased into a position closing the gas cartridge chamber.
;~ It is a further object of the present invention to provide , ~1 a novel and improved gas cartridge loader and extractor assembly which provides for improved flo- of the gas from the cartridge to the valve assembly.
These and further objects and advantages o the present invention will become more apparent upon reference to the ~ following specifiaation, appended claims and drawings wherein:
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. , FIGURE 1 is a side elevational view of a gas fired gun having a gas cartridge loader and extractor assembly constructed in accordance with the present invention;
FIGURE 2 is an enlarged fragmentary vertical cross-sectional view through the gun of Figure l;
FIGURE 3 is a fragmentary perspective view of the gun with parts broken out of the receiver or frame and further illustrating the novel and improved loader and extractor assembly of the present invention;
FIGURE 4 is a fragmentary perspective view of the underside of the gun illustratlng the cartridge receiving chamber along the underside of the stock and part of the loader and extractor assembly hereof in the chamber open and . cartridge loading position; .
; 15 FIGURE 5 is a view similar to Figure 4 illustrating the , gas cartridge disposed within the chamber and the chamber : partially closed; .
, . FIGURE 6 is an enlarged vertical cross-sectional view illustrating the cartridge within the closed chamber and the loader and extractor assembly in its position when the gun is ready for~firlng;
FIGURE 7 is an enlarged fragmentary vertical cross-: sectional view:o~f the cartridge chamber and part of the : :loader and extractor assembly upon initiaL insertion of a cartridge into the chamber; ~ ~
I ~ ~ FIGURE 8 is a view similar to Figure 7 illustrating ~- the position of the various parts of the loader ,and extractor : :: . ~:
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10~10067 assembly with the lever thereof in an intermediate partially . closed position; and FIGURE 9 is a view similar to Figure 7 illustrating the lever in a fully closed position with the gas cartridge . 5 backed off the piercing member.
: Referring now to the drawings, particularly to : Figures 1-2, there is illustrated a gas fired gun generally designated 10 comprised of a frame 12 having a ¦ forearm stock 14, a shoulder stock 16, a trigger mechanism generally designated 18 including a trigger 20, a barrel 22 within a shroud 24, a magazine tube 26 below barrel shroud 24, and front and rear sights 27 and 28 respectively on shroud 2~.
¦ Gu~ 10 is provided with a gas cartridge C which supplies gas under pressure to a valve assembly 30 for firing individual BB shot transferred from magazine tube 26 by a loader or transfer I . mechanism 32 to a position in line with barrel 22.
:.~ A brief description of the trigger mechanism, valve l assembly and shot transfer mechanism and their operation will :l . now be provided to facilitate understanding of the overall operation of the gun and the loader and extractor assembly thereof respectively. Trigger assembly 18 includes a safety : lever 40, a safety latch 42, a generally U-shaped trigger element 44 forming an upper extension of trigger 20 and pivotally carrying a sear 46, and a hammer 48 biased by spring 50 for pivotal movement about shaft 52 into engagement with a valve firing pin 54. Trigger:element 44 is carried for .
: pivotal movement about a pin 49. A loader:lever 56 is ~ pivotally c-rrled at 58 and has a kidney chaped opening 60 ,; . - 6 - : :
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- ~080(~7 receiving the sear pivot pin 62. The safety latch 42 is pivoted about pin 64 and safety lever 40 is pivoted about post . 66.
: Valve assembly 30 and transfer mechanism 32 are best illustrated in Figure 7. Valve assembly 30 includes a stem 70 : carrying a firing pin 54. The upper end of stem 70 seats against the valve housing. Stem 70 is polygonal in cross section and is biased into sealing engagement against the valve housing by a spring 72. A passage 74 lies in communication with the gas in cartridge C at one passage end through a piercing assembly generally designated 76 and a valve chamber 78 at its opposite end.. Passage 80 lies in communication with valve chamber 78 on the other side of the valve seal and lies in communication j with barrel 34.
Piercing assembly 76 includes a piercing cone 82 retained within a bore 84 on valve assembly 30 by a piercing ; cone retainer washer 86. A piercing seal 88 is retained in the bore ~4 by a retaining nut 90. Thus, it will be appreciated ::
that piercing assembly 76 provides a piercing cone 82 for ,. ~20 ~ puncturing the end seal 92 of the cartridge C.~
I ~ : : When the gas cartridge C is in the chamber 68 formed along the underslde~of:frame 12 and ln operative positlon with gas flowing~therefrom past the piercing assembly 76 into.valve assembly 30, the gun is ready for firing. To fire the gun , the:~safety~lever 40 is advanced about post 66 to the:fire position~releasing the trigger mechanism 18 for ..
: ~iring the gun.. This rotates safety latch 42 in counter-clockwise direction as seen in Figure 2 releasi.ng trigger bar ~ .
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45 from engagement with a catch 47 on safety latch 42.
; Squeezing trigger 20 causes sear 46 to engage hammer 48 and pivot it about pivot 52 to a cocked position against the bias of spring 50 and spaced from firing pin 54. Upon further pivotal movement of trigger 20, sear 46 drops off hammer 48 and spring 50 retracts hammer 48 against pin 54 momentarily ¦
depressing the latter. By depressing pin 54, a charge of gas from cartridge C communicates through passages 74, 78 and 80 in ; val~e assembly 30 to a location behind the BB shot in transfer arm 32 whereupon the BB is fired or propelled through barrel 22.
Referring now to Figures 3 and 6, there is illustrated a loader and extractor assembly, generally designated 98, for loading the gas cartridge C into chamber 68 and extracting it therefrom. Particularly, assembly 98 includes a cam rod 100 having a diametrically enlarged shaft portion 102 slidable in a guide 104. A reduced diameter shaft portion 106 of cam rod 100 is slidable in a guide 108. Each of guides 104 and 103 is carried by frame 12. The rearmost end of cam rod 100 carries a head 110, having a concave 111 rearmost face conforming in shape to the bulbous forward end or nose of gas cartridge C. Concave face 111 centers and retains the forward end of the gas cartridge. The opposite end of cam rod 100 is e~compassed by a spring 112. Spring 112 bears at one end against guide 108 and at its opposite end against a retainer ~- 25 washer 114 carried by cam rod 100. Spring 112 biases cam rod 100 for sliding movement in an axial direction away from piercing assembly 76.
To provide for insertion, retention and removal of ~ .
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. gas cartridge C relative to chamber 68, an elongated lever 116 is pivotally carried on a pin 118 secured to frame 12.
The rearmost end of lever 116 carries a tip 120 which projects slightly downwardly below the underside of frame 12 when the lever 116 lies flush along the frame closing chamber 68 whereby the lever can be grasped and pivoted downwardly~ for example to the position illustrated in Figure 4. The forward end of lever 116 is provided with a pair of cam surfaces 122 which straddle the reduced diameter portion 106 of cam rod 100. Cam surfaces 122 bear against a cam block 124 carried by rod 100 intermediate the diametrically enlarged and reduced shaft portions 102 and 106 respectively. Cam block 124 is stepped along the side margins of its forward face to provide shoulders 126. The lower edges of shoulders 126 are tapered rearwardly to form entry cam surfaces 128. Cam surfaces 122 on lever 116 have high portions or tips 130 for reasons which become clear from the ensuing description. Lever 116 also has a pair of flats 131 contiguous to cam surfaces 122.
Referring no~ to Figures 4 and 7, it will be seen that lever 116 is pivoted about pin 118 to a position where it projects substantially at right angles from the underside of frame 12. By pivoting lever 116 outwardly away from frame 12, the cam surfaces 122 are displaced forwardly away from shoulders 1~26 on cam block l?4 enabling spring 112 to bias cam rod 100 axially forwardly with cam block 124 in following engagement with cam surfaces 122 and ultimate bearing against flats 131 as illustrated in Figure 7. ~his enlarges chamber ~1 _ 9 _ .
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. '.
¦ 68 in an axial direction enabling insertion of cartridge C, as l illustrated in Figures 4 and 7, into chamber 68. This cartridge, ¦ as illustrated in Figure 7, is dropped into chamber 68 and ¦ its reduced end is disposed within the bore of piercing assembly.
Lever 116 is then rotated or pivoted back from this first described position projecting from the underside of the gun -to an intermediate or second position illustxated in Figures 5 and 8. During this movement, cam surfaces 122 cam against shoulders 126 of the cam block and displace cam rod 100 and cartridge C axially rearwardly toward piercing assembly 76.
Movement of cartridge C rearwardly forces the cartridge cap or seal against piercing cone 82 and the cartridge cap is thus pierced. When the lever 116 lies in its intermediate position, i the cartridge C is advanced toward the piercing assembly such that the margins of the cartridge about its cap depress the seal 88 as illustrated in Figure 8. Also, the high points 130 of lever 116 have moved along entry cam surfaces 128 on cam block 124.
Movement of lever 116 from its intermediate position illustrated in Figure 8 to its third position wherein it lies flush against the underside of frame 12 causes the high points 130 to bear against shoulders 126 on cam block 124. Further f:~ : : :
movement of lever 116 toward its~flush position moves high polnts 130 along an arc away from cam block 124.Thus, cam I ~ block 124 moves axialIy forwardly under the~blas o spring 112 in foIlowing engagement with high points 130 whereby the rear-ward force on the cartridge is relieved enabling the cartridge to back off the piercing cone 82 as illustrated in Figure 9 . , ' ~
: - 10 -~ .
~ 080067 to a limited extent to define a gas passage small enough to act as a filter against entry of impurities from the cartridge into $he valve. This facilitates flow of gaLs from cartridge C about piercing cone 82 and into the passageway 74. Simultaneously, the margins about the pierced cap of cartridge C retain their sealing engagement against the resilient piercing seal 88.
Advantageously, high points 130 of cam surfaces 122 obtain an overcenter position when bearing against shoulders 126 and particularly upon initial movement of lever 116 from its intermediate position toward its flush posit:ion.
The forward bias of cam rod 100 under the bias of spring 112 and against flat shoulders 126 acts on the high points 130 along a line above the lever pivot 118. Consequently, the spring action and the force of the sealing gasket on the gas cylin der tends to rotate or bias the lever for rotation in a clockwise direction as illustrated in Figure 8. Thus, lever 116 is biased into a position flush against the underside of the frame. Also, any propulsive force generated by the gas escaped from the car-tridge in the chamber biases lever 116 in a like direction, Thus, slight movement of the lever outwardly from its position along the underside of the frame is counteracted by the spring force, the gasket force, and any propulsive ~force generated by the gas escap-ing the cartridge when in the chamber tends to maintain the chamber closed.
1 25 To extract cartridge C from chamber 68, the lever is slowly moved from its third or flush position through its intfffrmediate or second position into the first position pro-jecting from the underside of the gunO This enables escape of substantially all of the gas before the lever passes through f - 11 -1~18~6~
the original position.
It will be appreciated that accidental or inadvertent movement of the lever from its flush position toward its inter-mediate position and release thereof will result in automatic return of the lever to the flush position through the interaction of the cam surfaces, the bias of the spring 112, the gasket 88, and the propulsive force resulting from the gas under pressure in cartridge C. That is, the cam surfaces on the lever and the shoulders in the cam block cooperate such that the lever moves overcenter intermediate its extremes of rotation, i.e. pro}ecting : , .
outwardly from the underside of the gun and lying flush along the underside of the gun. Thus, the action of the spring and the pro-pulsive force of pressurized gas serve to retain the lever in its flush position closing the chamber 68 containing cartridge C. It should be noted that gas will not escape to the atmosphere until after the lever passes the intermediate position.
The invention may be embodied in other specific forms ,A~ without departing from the spirit or essential characteristics ~! ~ thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the ~oregoing desaription, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
.
: ' :
' .
. ~ . .. . ~
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A gas fired gun comprising: a gun frame; a barrel carried by said frame; means carried by said frame defining a chamber for receiving a gas-filled cartridge; a trigger mechanism carried by said frame; means responsive to actuation of said trigger mechanism for firing the gun including a valve assembly having a piercing member at one end of said chamber; a loader assembly carried by said frame adjacent the opposite end of said chamber including an element movable toward and away from said piercing member, means for biasing said element for move-ment in a direction away from said piercing element, a lever pivotable between first and second positions through an inter-mediate position, a cam surface carried by said lever and a cam follower surface carried by said element, said cam surface being profiled such that on movement of said lever from its first position toward said intermediate position, said element moves against the bias of said biasing means in a direction toward said piercing member thereby to displace and puncture the gas-filled cartridge in said chamber against said piercing member and that on continued movement of said lever from said intermediate position to said second position, said element moves in a direction away from said piercing member.
2. A gun according to claim 1 including means carried by said frame defining an opening therein through which the gas cartridge is passed into said chamber, said lever being carried by said frame for pivotal movement between said first position, which extends outwardly of said frame and said second position which lies substantially flush along said frame and overlying said opening.
3. A gun according to claim 2 wherein said lever has a head portion at one end thereof on which said cam surface is formed, said lever being pivoted about a pivot point in said head portion.
4. A gun according to claim 1 wherein said cam follower surface comprises a flat portion, and a bevelled edge portion for facilitating smooth sliding engagement with said cam surface as said lever is moved from said first to second positions.
5. A gun according to claim 3 wherein said head portion has an overhanging bulge which, in the second position of the lever, faces towards said cam follower surface, and which defines a high point on said cam surface so as to provide said movement towards and away from said piercing member as said lever is pivoted from said first position to said second position.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76555677A | 1977-02-04 | 1977-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1080067A true CA1080067A (en) | 1980-06-24 |
Family
ID=25073866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,288A Expired CA1080067A (en) | 1977-02-04 | 1977-11-21 | Cartridge mechanism for gas fired guns |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5397300A (en) |
| CA (1) | CA1080067A (en) |
| DE (1) | DE2748608A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020084547A1 (en) * | 2018-10-24 | 2020-04-30 | Buys Andre Johann | A pneumatic arrangement of a less-lethal device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19542326A1 (en) * | 1995-11-14 | 1997-05-15 | Umarex Gmbh & Co Kg | Pressurized gas firearm |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4531679Y1 (en) * | 1970-04-28 | 1970-12-04 |
-
1977
- 1977-10-29 DE DE19772748608 patent/DE2748608A1/en not_active Withdrawn
- 1977-11-21 CA CA291,288A patent/CA1080067A/en not_active Expired
-
1978
- 1978-01-09 JP JP106378A patent/JPS5397300A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020084547A1 (en) * | 2018-10-24 | 2020-04-30 | Buys Andre Johann | A pneumatic arrangement of a less-lethal device |
| CN113302447A (en) * | 2018-10-24 | 2021-08-24 | 拜尔纳技术股份有限公司 | Pneumatic device of low-fatal equipment |
| US11680770B2 (en) | 2018-10-24 | 2023-06-20 | Byrna Technologies, Inc. | Pneumatic arrangement of a less-lethal device |
| CN113302447B (en) * | 2018-10-24 | 2023-12-01 | 拜尔纳技术股份有限公司 | Pneumatic device for low-deadly equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2748608A1 (en) | 1978-08-10 |
| JPS5397300A (en) | 1978-08-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |