NL2033758B1

NL2033758B1 - Game gun

Info

Publication number: NL2033758B1
Application number: NL2033758A
Authority: NL
Inventors: Sun Huiping
Original assignee: Univ Ningbo Technology
Priority date: 2022-03-21
Filing date: 2022-12-19
Publication date: 2023-09-29
Also published as: CN114558318A

Abstract

Disclosed is a game gun. The game gun includes a base, a gas supply assembly, a firing assembly, and a reciprocating driving assembly; the reciprocating driving assembly includes a cavity, a piston rod being slidably connected in the cavity, a reset spring being arranged on the piston rod in a sleeving manner, and the gas supply assembly supplying high—pressure gas to the cavity, and then pushing the piston rod to move towards one side; and the reciprocating driving assembly further includes a compression spring, after the gas supply assembly stops supplying gas, the piston rod recovering to an initial position under an elastic recovery action of the compression spring. The game gun having such a structure does not inject gas or bullets, but relies on reciprocating motion of the piston rod to hit the base, so as to simulate a recoil.

Description

P1664 /NL

GAME GUN

TECHNICAL FIELD

The present invention relates to a game gun.

BACKGROUND ART

A "non-lethal" simulation game gun in the prior art is inter- nally provided with a simulation mechanism utilizing an injection force of high-pressure gas to generate a hand feeling of a recoil in order to simulate a hand feeling of a recoil generated at the moment of firing. However, the simulation mechanism needs to in- ject high-pressure gas or bullets injected by the high-pressure gas outwards, and the generated recoil is small and difficult to control and adjust. Furthermore, if the game gun has bullets, these injected bullets are not convenient to recycle, thereby af- fecting an environment, and therefore it is necessary to improve the game gun.

SUMMARY

Aiming at the defects of the prior art, the present invention provides a game gun, which uses a single-acting cylinder to quick- ly hammer a body of the game gun to generate a recoil, and may conveniently obtain the required recoil by adjusting gas pressure and stiffness of a reset spring, thereby obtaining a hand feeling extremely close to real shooting.

The technical solution used by the present invention to solve the technical problem of the present invention is as follows: a game gun includes a base, a gas supply assembly and a firing as- sembly, where each time the firing assembly is pressed, the gas supply assembly emits high-pressure gas outwards, and the game gun further includes a reciprocating driving assembly; the reciprocat- ing driving assembly includes a cavity, the cavity being provided in the base, a piston rod being slidably connected in the cavity, a reset spring being arranged on the piston rod in a sleeving man- ner, the cavity being in communication with the gas supply assem-

bly, and the gas supply assembly supplying high-pressure gas to the cavity, and then pushing the piston rod to move towards one side; and the reciprocating driving assembly further includes a compression spring, after the gas supply assembly stops supplying gas, the piston rod recovering to an initial position under an elastic recovery action of the compression spring. The game gun having such a structure does not inject gas or bullets, but relies on reciprocating motion of the piston rod to hit the base, so as to simulate a recoil. In this way, no danger will be caused by in- jected objects, in addition, compared with an original way of re- alizing a recoil by the injected objects, a size of the recoil may be adjusted, and different recoils may be realized by changing weight of the piston rod and stiffness of the reset spring, there- by simulating different firearms.

In the above technical solution, preferably, the reciprocat- ing driving assembly further includes an upper cover, where the upper cover is slidably connected to the base, and the piston rod is connected to the upper cover. With such a structure, the upper cover may reciprocate together with a piston, to simulate an ac- tion of the gun during firing.

In the above technical solution, preferably, the game gun further comprises a counting resetting assembly, where the count- ing resetting assembly comprises a counting ratchet, a pawl being arranged on the upper cover, and each time the upper cover recip- rocates, the pawl driving the counting ratchet to rotate by a scale. The counting ratchet rotates by a scale, which indicates that a bullet is fired.

In the above technical solution, preferably, a shallow groove is provided on the counting ratchet, and the counting resetting assembly further comprises a reset slider and a locking pin, the locking pin being fixed on the reset slider, one end of the reset slider being connected to a reset wrench, the reset wrench being slidably connected to the base, when the upper cover moves back- ward, the pawl toggling the counting ratchet to rotate by a scale, and the locking pin being clamped into the shallow groove to en- sure that the ratchet does not move randomly.

In the above technical solution, preferably, a deep groove is provided on the counting ratchet, and when the locking pin is in- serted into the deep groove, the reset slider moves forwards to clamp the firing assembly. The function of the deep groove is to indicate that bullets of the game gun are ran out when the count- ing ratchet rotates to the point that the deep groove makes con- tact with the locking pin, and in this case, the firing assembly is clamped and a player may not fire bullets, thereby simulating a state that the gun bullets are ran out.

In the above technical solution, preferably, the counting re- setting assembly further comprises a reset connecting rod and a reset spring, the reset connecting rod being slidably connected to the base, the reset slider being fixed on the reset connecting rod, and the reset spring being arranged at an end of the reset connecting rod. Under the action of the reset spring, the reset connecting rod enables the locking pin to make close contact with the counting ratchet all the time.

In the above technical solution, preferably, the game gun further comprises a reset elastic hook, where a protrusion is ar- ranged on a side surface of the counting ratchet, the reset elas- tic hook is fixed on the reset slider, makes contact with the side surface of the counting ratchet, and matches the protrusion, and when the locking pin is inserted into the deep groove, the reset wrench is pulled to drive the reset elastic hook to pull the pro- trusion, such that the counting ratchet rotates and the locking pin slides out of the deep groove. By pulling the reset wrench, the locking pin may slide out of the deep groove, such that the reset slider moves backwards, and the firing assembly may work anew to simulate a process of changing ammunition for a real gun.

In the above technical solution, preferably, the firing as- sembly includes a toggling lever, an intermediate gear and a trig- ger, the trigger and the toggling lever being rotatably connected to the base, the toggling lever being slidably connected to the base, the trigger driving the intermediate gear to rotate by means of a gear, the intermediate gear driving the toggling lever to move by means of the gear, and the toggling lever matching a valve of the gas supply assembly.

In the above technical solution, preferably, the firing as-

sembly further comprises a limiting buckle and a limiting spring, a groove being provided on the toggling lever, the limiting buckle being slidably connected to the base, the limiting buckle matching the groove, the limiting spring ejecting the limiting buckle to the groove, and when the limiting buckle is clamped into the groove, the toggling lever opening the valve of the gas supply as- sembly, such that the gas supply assembly is in an open state.

In the above technical solution, preferably, the game gun further comprises a safety button, where the safety button is con- nected to the base, an elastic buckle is connected to the safety button, and the elastic buckle is clamped into the intermediate gear by moving the safety button, such that the intermediate gear cannot rotate.

The present invention has the beneficial effects that the game gun having such a structure does not inject gas or bullets, but relies on reciprocating motion of the piston rod to hit the base, so as to simulate a recoil. In this way, no danger will be caused by injected objects, in addition, compared with an original way of realizing a recoil by the injected objects, a size of the recoil may be adjusted, and different recoils may be realized by changing weight of the piston rod and stiffness of the reset spring, thereby simulating different firearms.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic solid diagram of the present invention.

FIG. 2 is a schematic diagram of FIG. 1 with an upper cover removed.

FIG. 3 is a schematic front view of the present invention.

FIG. 4 is a schematic sectional view of FIG. 3 along A-A.

FIG. 5 is a schematic sectional view of FIG. 3 along B-B.

FIG. 6 is a schematic sectional view of a reciprocating driv- ing assembly.

FIG. 7 is a schematic diagram of the upper cover.

FIG. 8 is a schematic diagram of the present invention with the upper cover and a base removed.

FIG. 9 is a schematic diagram of the present invention from another perspective.

FIG. 10 is a schematic diagram of the base.

FIG. 11 is a matching schematic diagram of a counting reset- ting assembly and a firing assembly. 5 DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention will be further described in details below with reference to the accompanying drawings and particular embodiments.

With reference to FIGs. 1 to 11, a game gun includes a base 10, a reciprocating driving assembly 20, a counting resetting as- sembly 30, a firing assembly 40, a gas supply assembly 50 and a safety button 60.

The base 10 is a firm and rigid assembly, and is locked to a grip of a pistol or a body of a rifle during use. A front end of the base 10 is provided with a section of bulge 11, and a smooth circular hole 12 is provided inside the bulge 11. A vertical square hole 19 is provided in the base 10 located at a rear of the bulge 11. A baffle 18 is arranged in a middle of the base 10, and a kidney-shaped hole 16 and a horizontal strip-shaped hole 15 are provided on the baffle. Two ends of a tail of the base 10 are pro- vided with two semicircular grooves 17. An inclined square hole 13 is provided in a middle of the tail of the base 10.

The reciprocating driving assembly 20 is composed of an upper cover assembly 21, a piston rod assembly 22 and a front end assem- bly 23. The piston rod assembly 22 is fixedly connected to the up- per cover assembly 21, and the front end assembly 23 is fixedly connected to the base 10.

A circular hole at an upper part of a front end plate 217 in the upper cover assembly 21 is slidably connected to a guide pipe 23-1 of the front end assembly 23, and the guide pipe is used for guiding the upper cover assembly to move linearly and serves as the muzzle of the gun at the same time. A middle hole of the front end plate 217 is fixedly connected to a piston rod 222 in the pis- ton rod assembly 22, and a pneumatic driving force is transmitted to the upper cover assembly 21 by means of a hinge pin 216. An up- per cover 211 in the upper cover assembly 21 is provided with a roller 212 and a pawl 213.

The piston rod assembly 22 is provided with the piston rod 222, a sealing ring 223 and a guide ring 224 are arranged on the piston rod, and the piston rod assembly 22 is arranged in the smooth circular hole 12 and forms a sealed gas chamber with the smooth circular hole 12 to form a pneumatic driving cavity. The piston rod 222 is provided with a reset spring 225 for resetting the piston rod 222 after the pneumatic driving force disappears.

An end of the piston rod 222 is provided with a cap nut 221, and the cap nut 221 is used for being fixedly connected to the front end plate 217 of the upper cover assembly 21.

The front end assembly 23 is provided with an end cover 234, a guide pipe 231, a right-angle gas nozzle 235, a dust ring 232 and a guide ring 233. The guide pipe 231 is used for guiding the upper cover assembly 21 to linearly move, and the right-angle gas nozzle 235 is used for being connected to the gas supply assembly 50, and introducing compressed air into the circular hole 12 to generate a driving force, so as to push the piston rod to move.

The end cover 234, the dust ring 232, the guide ring 233 and the circular hole 12 on the base 10 form a front end cover of a pres- sure gas chamber.

When the compressed air is introduced into the pressure gas chamber, the piston rod moves backwards and hits the base to gen- erate a simulated recoil. A size of the recoil is determined by pressure and a spring force, by adjusting intensity of pressure of the introduced compressed air and stiffness of the reset spring 225, the simulated recoil consistent with a recoil of a practical gun may be obtained, so as to obtain a real hand feeling of shoot- ing.

The counting reset assembly 30 is provided with a counting ratchet 31, a resetting slider 32, a reset wrench 33, a reset con- necting rod 34, a locking spring 35, a stop pin 36, a reset spring 37, a locking pin 38 and a reset elastic hook 39.

The counting ratchet 31 is rotatably connected to the base 10, a shallow groove 311 and a deep groove 312 are provided on a circumference of the counting ratchet 31, and a protrusion 313 is arranged on an end surface of the counting ratchet 31 closes to an inner side.

The locking pin 38 is fixed on the reset slider 32, the reset slider 32 is slidably connected in the strip-shaped hole 15, the reset slider 32 is connected to the reset wrench 33 and the reset connecting rod 34, the reset wrench 33 is slidably connected to the base 10, and an end of the reset connecting rod 34 is provided with the reset spring 37. A middle of the reset connecting rod 34 is provided with a groove 341, the stop pin 36 is slidably con- nected to the gas supply assembly 6, and the locking spring 35 en- ables the stop pin to make close contact with the groove 341 all the time. The reset elastic hook 39 is also fixed on the reset slider 39.

Each time the gun is fired, the upper cover assembly 21 moves towards a rear end of the game gun once, and the pawl 215 of the upper cover assembly toggles the counting ratchet 31 to rotate by a scale, and the locking pin 38 is clamped into the shallow groove 311 on the counting ratchet 31 to ensure that the counting ratchet may not move randomly. Moreover, the stop pin 36 is located at a bottom of the groove 341 at the bottom, and in this case, a top of the stop pin 36 is also at a low point, and therefore the stop pin may not interfere with reciprocating motion of the upper cover as- sembly. When the counting ratchet rotates to a position of the deep groove 312, under the pushing of the reset spring, the reset slider 32 moves forwards, and drives the locking pin 38 to move forwards, and a square head of the locking pin clamps the firing assembly 40, such that the gun may not be fired anew. Moreover, the bottom of the stop pin 36 also moves from the bottom of the groove 341 to a high point of the groove 341, such that the top of the stop pin rises to block a clamping block 214 on the upper cov- er from returning to the foremost end, so as to simulate the state when the pistol or the rifle is ran out of bullets. In order to enable the game gun to be fired anew, the reset wrench 33 is pulled to drive the reset slider to move backwards, and then the reset elastic hook is driven to hook the protrusion 313 on the counting ratchet 31, such that the ratchet rotates by a certain angle and is separated from the deep groove 312. The reset con- necting rod 34 moves backwards, the stop pin 36 retracts under an action of the locking spring 35, and the upper cover assembly 21 returns to the position thereof under an action of the reset spring 22-5. This step is to simulate the clip changing step after the gun is ran out of the bullets.

The firing assembly 40 is provided with a toggling lever 41, an intermediate gear 42, a limiting buckle 43, a limiting spring 44 and a trigger 45. The toggling lever 41 and the intermediate gear 42 are rotatably connected to the base 10, the toggling lever 41 is slidably connected in the base 10, one end of the toggling lever 41 is connected in a kidney-shaped hole 18, and a clamping groove 411 is provided in a middle of the toggling lever 41. The trigger 45 drives the intermediate gear 42 to rotate by means of a gear, and the intermediate gear 42 drives the toggling lever 41 to move by means of the gear, and the toggling lever 41 matches a valve of the gas supply assembly 50. The limiting buckle 43 is mounted in the square hole 19, and the limiting spring 44 is ar- ranged on the limiting buckle 43 in a sleeving manner. The limit- ing buckle 43 is provided with a first top 431 and a second top 432.

When the gun is fired, the trigger 45 is pulled towards the left to drive the intermediate gear 42 to rotate and drive the toggling lever 41 to move leftwards, and the clamping groove 411 on the toggling lever is aligned with the first top 431 of the limiting buckle 43, and clamps the toggling lever to limit the toggling lever to move rightwards under an action of the limiting spring 44. A left end of the toggling lever continuously presses a gas valve of the gas supply assembly, and opens a gas supply chan- nel to input the compressed air into the smooth circular hole 12, thereby generating a driving force to push the piston rod to move, the piston rod drives the upper cover assembly to move backwards, and the roller 212 of the upper cover assembly presses the second top 432 of the limiting buckle 43, such that the first top 431 of the limiting buckle 43 is separated from the clamping groove 411.

The toggling lever 41 moves rightwards under the action of the re- set spring of the gas valve 51 to close the compressed air chan- nel.

The gas supply assembly is provided with the gas valve 51, a pressure adjusting valve 52, a gas inlet seat 53, a right-angle gas nozzle 54, a gas inlet pipe 55 and a gas pipe buckle assembly 56. The gas valve 51, the pressure adjusting valve 52, the right- angle gas nozzle 54 and the gas inlet pipe are fixedly connected into a whole, and the gas pipe buckle assembly 56 fixes the gas pipe on the base 10. The gas valve 51 matches the toggling lever 41, and when the toggling lever 41 slides, the gas valve may be pulled to control opening and closing of the gas supply assembly.

The pressure adjusting valve 52 is connected to an external gas source, and the pressure regulating valve 52 may adjust gas pres- sure entering the gas supply assembly. The gas inlet seat 53 is mounted on the inclined square hole 13. The stop pin 36 is slida- bly connected to the gas inlet seat 53. The gas inlet pipe 55 guides the compressed air into the front end assembly 23, and the compressed air finally enters the circular hole 12 to push the piston rod to move.

The safety button 60 may move linearly back and forth on the base 10, and the elastic buckle 61 fastens the base and may only move linearly. Protrusions on a moving block 62 are aligned with two pits on the base, so as to realize front and rear positioning of the safety button. During forward movement, the safety button is released, and the trigger may be pulled for shooting, and dur- ing backward movement, the intermediate gear is locked, and the gun may not be fired.

Claims

CONCLUSIESCONCLUSIONS

1. Spelpistool, omvattende een basis, een gastoevoersamenstel en een afvuursamenstel, waarbij elke keer dat het afvuursamenstel wordt ingedrukt, het gastoevoersamenstel gas onder hoge druk naar buiten uitstoot; het spelpistool omvat verder een heen en weer be- wegend aandrijfsamenstel; het heen en weer bewegende aan- drijfsamenstel omvat een holte, waarbij de holte is aangebracht in de basis, een zuigerstang verschuifbaar is verbonden in de holte, een terugstelveer op een omhullende manier is aangebracht op de zuigerstang, de holte in verbinding staat met het gastoevoersamen- stel, en waarbij het gastoevoersamenstel gas onder hoge druk aan de holte levert, en vervolgens de zuigerstang naar één kant duwt; en waarbij het heen en weer bewegende aandrijfsamenstel verder een drukveer omvat, waarbij nadat het gastoevoersamenstel stopt met het toevoeren van gas, de zuigerstang terugkeert naar een begin- positie onder een elastische herstelwerking van de drukveer.A gaming gun comprising a base, a gas supply assembly and a firing assembly, wherein each time the firing assembly is pressed, the gas supply assembly ejects high-pressure gas; the game gun further includes a reciprocating drive assembly; the reciprocating drive assembly includes a cavity, the cavity being disposed in the base, a piston rod slidably connected within the cavity, a return spring being disposed in an enveloping manner on the piston rod, the cavity communicating with the gas supply assembly - set, and where the gas supply assembly supplies gas under high pressure to the cavity, and then pushes the piston rod to one side; and wherein the reciprocating drive assembly further comprises a compression spring, wherein after the gas supply assembly stops supplying gas, the piston rod returns to a home position under an elastic recovery action of the compression spring.

2. Spelpistool volgens conclusie 1, waarbij het heen en weer bewe- gende aandrijfsamenstel verder een bovenste deksel omvat, waarbij het bovenste deksel verschuifbaar is verbonden met de basis, en de zuigerstang is verbonden met het bovenste deksel.The gaming gun of claim 1, wherein the reciprocating drive assembly further comprises an upper cover, the upper cover slidably connected to the base, and the piston rod connected to the upper cover.

3. Spelpistool volgens conclusie 2, verder omvattende een tel- terugstelsamenstel, waarbij het tel-terugstelsamenstel een telra- tel omvat, waarbij een pal op het bovenste deksel is aangebracht, en telkens wanneer het bovenste deksel heen en weer beweegt, de pal de telratel aandrijft om over een schaal te draaien.3. The gaming pistol of claim 2, further comprising a count reset assembly, the count reset assembly comprising a count ratchet, a catch being provided on the top cover, and each time the top cover moves back and forth, the catch engages the count ratchet. drives to rotate on a scale.

4. Spelpistool volgens conclusie 3, waarbij een ondiepe groef is aangebracht op de telratel, en het tel-terugstelsamenstel verder een terugstelschuif en een borgpen omvat, waarbij de borgpen is vastgezet op de terugstelschuif, waarbij een uiteinde van de te- rugstelschuif is verbonden met een terugstelsleutel, waarbij de terugstelsleutel verschuifbaar is verbonden met de basis, en wan- neer de bovenste deksel naar achteren beweegt, schakelt de pal de telratel om over een schaal te draaien en wordt de borgpen in de ondiepe groef geklemd om ervoor te zorgen dat de telratel niet willekeurig beweegt.4. The game gun of claim 3, wherein a shallow groove is provided on the counting ratchet, and the counting reset assembly further includes a reset slider and a locking pin, the locking pin being secured to the reset slider, an end of the reset slider being connected to a reset key, where the reset key is slidably connected to the base, and when the top cover moves rearward the catch engages the counting ratchet to rotate over a scale and the locking pin is clamped into the shallow groove to ensure that the counting ratchet does not move randomly.

5. Spelpistool volgens conclusie 1, waarbij een diepe groef is aangebracht op de telratel, en wanneer de borgpen in de diepe groef wordt gestoken, beweegt de terugstelschuif naar voren om het afvuursamenstel vast te klemmen.5. The gaming pistol of claim 1, wherein a deep groove is provided on the counting ratchet, and when the locking pin is inserted into the deep groove, the reset slide moves forward to clamp the firing assembly.

6. Spelpistool volgens conclusie 5, waarbij het tel- terugstelsamenstel verder een terugstelverbindingsstang en een te- rugstelveer omvat, waarbij de terugstelschuif op de terugstelver- bindingsstang is bevestigd, en de terugstelveer aan een uiteinde van de terugstelverbindingsstang is aangebracht.The gaming pistol of claim 5, wherein the count reset assembly further includes a reset link rod and a return spring, the return slider being mounted on the reset link bar, and the return spring being mounted at an end of the reset link bar.

7. Spelpistool volgens conclusie 6, verder omvattende een elasti- sche terugstelhaak, waarbij een uitsteeksel is aangebracht op een zijoppervlak van de telratel, waarbij de elastische terugstelhaak is bevestigd aan de terugstelschuif, contact maakt met het zijop- pervlak van de telratel, en past bij het uitsteeksel, en wanneer de borgpen in de diepe groef wordt gestoken, wordt aan de terug- stelsleutel getrokken om de elastische terugstelhaak aan te drij- ven om aan het uitsteeksel te trekken, zodat de telratel draait en de borgpen uit de diepe groef schuift.The game gun of claim 6, further comprising an elastic reset hook, wherein a protrusion is provided on a side surface of the counting ratchet, the elastic reset hook being attached to the return slide, contacting the side surface of the counting ratchet, and fitting at the protrusion, and when the locking pin is inserted into the deep groove, the reset key is pulled to drive the elastic reset hook to pull the protrusion, so that the counting ratchet rotates and the locking pin slides out of the deep groove .

8. Spelpistool volgens conclusie 5, waarbij het afvuursamenstel een tuimelhefboom, een tussentandwiel en een trekker omvat, waar- bij de trekker en de tuimelhefboom roteerbaar zijn verbonden met de basis, waarbij de tuimelhefboom verschuifbaar is verbonden met de basis, waarbij de trekker het tussenliggende tandwiel aandrijft om te draaien door middel van een tandwiel, waarbij het tussenlig- gende tandwiel de tuimelhefboom aandrijft om te bewegen door mid- del van het tandwiel, en waarbij de tuimelhefboom past bij een klep van het gastoevoersamenstel.The gaming pistol of claim 5, wherein the firing assembly includes a rocker lever, an idler gear and a trigger, the trigger and the rocker lever being rotatably connected to the base, the rocker lever being slidably connected to the base, the trigger being the intermediate driving the gear to rotate by means of a gear, the intermediate gear driving the rocker lever to move by means of the gear, and the rocker lever mating with a valve of the gas supply assembly.

9. Spelpistool volgens conclusie 8, waarbij het afvuursamenstel verder een begrenzingsgesp en een begrenzingsveer omvat, waarbij een groef is aangebracht op de tuimelhefboom, waarbij de begren- zingsgesp verschuifbaar is verbonden met de basis, waarbij de be- grenzingsgesp past bij de groef, waarbij de begrenzingsveer de be- grenzingsgesp naar de groef uitwerpt, en wanneer de begrenzings- gesp in de groef wordt geklemd, opent de tuimelhefboom de klep van het gastoevoersamenstel, zodat het gastoevoersamenstel zich in een open toestand bevindt.The game gun of claim 8, wherein the firing assembly further includes a limiter buckle and a limiter spring, wherein a groove is provided on the rocker lever, the limiter buckle is slidably connected to the base, the limiter buckle mates with the groove, wherein the limiter spring ejects the limiter buckle towards the groove, and when the limiter buckle is clamped in the groove, the rocker lever opens the valve of the gas supply assembly so that the gas supply assembly is in an open condition.

10. Spelpistool volgens conclusie 8, verder omvattende een veilig- heidsknop, waarbij de veiligheidsknop is verbonden met de basis, een elastische gesp is verbonden met de veiligheidsknop, en de elastische gesp is vastgeklemd in het tussentandwiel door het be- wegen van de veiligheidsknop, zodat de tussenliggende tandwiel niet kan draaien.The gaming gun of claim 8, further comprising a safety button, the safety button being connected to the base, an elastic buckle being connected to the safety button, and the elastic buckle being clamped into the idler gear by moving the safety button, so that the intermediate gear cannot rotate.