TWI898369B - Crossbow string unloading mechanism - Google Patents

Abstract

This invention discloses a crossbow string unloading mechanism, comprising a trigger case, a trigger group, and a string release mechanism. The trigger case is connected to a crossbow body, providing a housing. The trigger group is housed within the trigger case to constrain the bowstring. The string release mechanism, housed within the trigger case and interacting with the trigger group, selectively triggers the trigger group to release the bowstring. With this assembly, after the crossbow is stringed, when tension is released, the string release mechanism, in conjunction with the string puller, slowly pulls the bowstring out of the trigger case, releasing its kinetic energy. This achieves a damage-free crossbow structure while also enabling safe bowstring release.

Description

Crossbow string unloading mechanism

This invention relates to the technical field related to crossbows, and more particularly to a crossbow string unloading mechanism.

According to the structure of a crossbow, as shown in Taiwan's Patent No. 207344, it consists of a crossbow body, a crossbow wing mounted horizontally at the front end of the crossbow body, a bowstring connecting the two ends of the crossbow wing, and a crossbow mechanism mounted on the crossbow body and interacting with the bowstring.

The bowstring is pulled tight by the stringer, interacting with the crossbow's trigger box to create the bowstring's winding and releasing motions. For details on the trigger box structure, please refer to Taiwanese Patent No. I662245.

While the aforementioned structure can achieve control over the bowstring's tensioning and release, not all bowstrings can be aimed after being strung, or are suitable for shooting in a safe environment. This necessitates the user releasing the bowstring tension.

Common methods involve shooting at soft targets or shooting directly without drawing the bow (commonly known as "open string"). The former causes some wear and tear to the bow, while the latter damages the crossbow. To address this issue, industry leaders have proposed solutions, such as US Patents US11002505 and US9360268. However, these solutions are often overly complex and inconvenient to operate, necessitating further improvement.

In view of the aforementioned problems and shortcomings of the prior art, one objective of the present invention is to provide a crossbow string unloading mechanism through structural innovation to overcome these shortcomings.

To achieve the aforementioned objectives, the present invention provides a crossbow string unloading mechanism comprising a trigger case, a trigger group, and a string release mechanism. The trigger case is connected to a crossbow body, providing a housing. The trigger group is housed within the trigger case to constrain the bowstring. The string release mechanism, housed within the trigger case and interacting with the trigger group, selectively triggers the trigger group to release the bowstring. With this assembly, after the crossbow is stringed, when tension is released, the string release mechanism, in conjunction with the string puller, slowly pulls the bowstring out of the trigger case, releasing its kinetic energy. This achieves a damage-free crossbow structure while also enabling safe bowstring release.

10: Crossbow Case

12: Half Shell

121: Shell Chamber

1221: First Articulation Pillar

1222: Second pivot pillar

1223: Third Articulation Pillar

14: Shell

141: Cover the chamber

142: Release slot

143: Release Slide

144:Activity Slot

16: Cover plate

182: Nock Groove

184: Nock Groove

221: First reset element

222: Second reset element

223: Third reset element

24: Trigger

242: T-type body

244: First Block

246: Second barrier

25: latch

251: First Arm

252: Second Arm

253: Third Arm

26: String hook

261: Claw Arm

263: Stopper

321, 322: Limiting slots

331, 332: Block slide

34: Elastic limiter

35: Insurance Block

351: Locking plate

352, 353: Slide part

354, 355: Strokes

3522: First positioning slot

3524: Second positioning slot

41: Release the string and pick the block

411: Dial column part

412: First block

4121: First Slope

413: Second block

4131: Concave

4132: Second Slope

4133: Joint Groove

4134: Abutment Section

42: Lever

431: Long slot hole

432: Vertical arm section

44: Cradle

441: Clubhead

442: Shaft

443: hook part

4421:Push department

4422: Retreat Department

45: Torsion spring

46: Blocking piece

461: Contact area

462: Deduction Department

463: Pillar

47: Elastic pressing parts

92: Bowstring

[Figure 1] Schematic diagram of an embodiment of the present invention.

[Figure 2] is a schematic diagram of the exploded view of the embodiment shown in Figure 1.

[Figure 3] is a schematic diagram (1) of the partial components of the embodiment shown in Figure 2.

Figure 4 is a schematic diagram of the partial components of the embodiment shown in Figure 3.

[Figure 5] is a schematic diagram (II) of the partial components of the embodiment shown in Figure 2.

Figure 6 is a schematic diagram of the partial components of the embodiment shown in Figure 5 from another perspective.

Figure 7 is a schematic diagram of the partial components of the embodiment shown in Figure 6.

[Figure 8] Schematic diagram of the embodiment of the present invention in normal operation.

[Figure 9] is a partial schematic diagram of the embodiment shown in Figure 8.

[Figure 10] Schematic diagram of the embodiment of the present invention in operation in the wound state.

[Figure 11] is a partial schematic diagram of the embodiment shown in Figure 10.

[Figure 12] Schematic diagram of the string release plucking block moving to the prepared position according to an embodiment of the present invention.

[Figure 13] Schematic diagram of the secondary string-pulling operation of an embodiment of the present invention.

[Figure 14] is a partial schematic diagram of the embodiment shown in Figure 13.

[Figure 15] Schematic diagram of the string release paddle moving to the string release position according to an embodiment of the present invention (I).

[Figure 16] Schematic diagram of the string release plucking block moving to the string release position according to an embodiment of the present invention (II).

[Figure 17] is a partial schematic diagram of the embodiment shown in Figure 15.

The following further describes embodiments of the crossbow string unloading mechanism of the present invention with reference to the relevant drawings. The various components in the embodiments are depicted according to scales, dimensions, deformations, or displacements appropriate for the purposes of illustration, and are not drawn to scale according to actual components. This is necessary to clarify. Identical and symmetrically arranged components in the remaining embodiments are denoted by the same reference numerals. Furthermore, directional terms such as "front, back, left, right, up, down, inside, and outside" in the descriptions of the embodiments listed below refer to the specific viewing directions and are not to be construed as limiting the present invention.

Please refer to Figures 1 to 7, which show the crossbow string unloading mechanism of the present invention, which includes a crossbow case 10, a trigger assembly (not labeled with a figure number), a trigger safety assembly (not labeled with a figure number), and a string release mechanism (not labeled with a figure number).

The crossbow case 10 is assembled into a crossbow (not shown) and comprises a half housing 12, a housing cover 14, and a cover plate 16 assembled on the top of the half housing 12. Together, they define a nock receiving slot 182 and a nock cutting slot 184. The half housing 12 (previously known in the art) has a housing chamber 121 and first, second, and third pivot posts 1221, 1222, and 1223.

The aforementioned housing chamber 121, as shown in Figure 4, is recessed into the end surface of the housing half 12 facing the housing cover 14.

The first, second, and third pivot pins 1221, 1222, and 1223 are vertically mounted at predetermined positions within the housing chamber 121, as shown in FIG4 .

The housing 14 has a cover chamber 141, a string release slot 142, a string release slide 143, and a movable slot 144.

The aforementioned cover chamber 141 is recessed in the end surface where the shell cover 14 and the half shell 12 abut.

The aforementioned string release slot 142 is formed through a preset position of the shell cover 14, connecting the cover chamber 141 and the outside.

The aforementioned string release slide 143 is recessed in a preset position of the cover chamber 141.

The aforementioned movable groove 144 is recessed into a preset position of the cover chamber 141 and has a truncated cone profile that is wider at the top and narrower at the bottom.

The trigger assembly (prior art), as shown in Figures 2 to 4 , is assembled within the housing half 12 and housed within the housing chamber 121 . It includes first, second, and third reset members 221 , 222 , and 223 , a trigger member 24 , a latch member 25 , and a string-pulling claw 26 .

As shown in Figures 2 to 4 , the trigger member 24 has a T-shaped body 242 and first and second stoppers 244 and 246 .

The front end of the horizontal section of the aforementioned T-shaped body 242 is pivotally connected to the first pivot post 1221. The end of the vertical section extends to the outside of the crossbow case 10 and is pushed by the first reset member 221, causing the horizontal section of the T-shaped body 242 to move away from the other end of the first pivot post 1221 and normally press against the first limit end surface 1261 of the chamber 121.

The first and second stops 244 and 246 are erected at the front and rear ends of the top surface of the T-shaped body 242.

As shown in Figures 2 to 4 , the latching member 25 is pivotally connected to the second pivot post 1222 and comprises an upwardly extending first arm 251, a downwardly extending second arm 252, and a forwardly extending third arm 253. The second arm 252 is pushed up by the second reset member 222, causing the third arm 253 to selectively press against the second stopper surface 1262 and the trigger member 24 (the horizontal end of the T-shaped body 242).

The string hook 26, as shown in Figures 2 to 4, is pivoted to the third pivot post 1223 and comprises an integrally formed claw arm 261, a claw hook 262, and a stopper 263.

The aforementioned claw hook 262 is formed by extending downward from one end of the claw arm 261.

The aforementioned stop 263 extends downward from the lower end of the claw arm 261. The string-catching claw 26 is pushed upward by the third reset member 223, causing one end of the string-catching claw 26 proximal to the hook 262 to normally abut against the wall of the housing chamber 121. The other end of the claw arm 261 abuts and interacts with the first arm 251 of the latch 25.

The trigger safety assembly (prior art) described above, as shown in Figures 1 to 4 , is located in the housing chamber 121 and the cover chamber 141 . It includes two limiting slots 321 and 322 , two trigger slides 331 and 332 , an elastic limiting member 34 , and a safety trigger 35 .

As shown in Figures 4 to 6, the limiting slots 321 and 322 extend centrally through the crossbow housing 10 (the half housing 12 and the housing cover 14).

As shown in Figures 4 to 6 , the block slides 331 and 332 are symmetrically recessed into the housing chamber 121 and the cover chamber 141 , respectively, and communicate with the respective limiting slots 321 and 322 .

As shown in Figure 4 , the elastic stopper 34 is pivotally mounted on the outer periphery of the second pivot post 1222 , with one end protruding into the block slide 331 of the half-shell 12 .

As shown in Figures 1 to 4 , the safety lever 35 is housed and extends through the lever guideways 331, 332 and the stop slots 321, 322. It is moved between a locked position and an unlocked position by external force or displacement of the string-pulling claw 26. The safety lever 35 comprises an integrally formed locking plate 351, two sliding plates 352, 353, and two levers 354, 355.

The aforementioned slide portions 352, 353 are respectively arranged on both ends of the lock portion 351 orthogonally, and between the end surfaces of the two slide portions 352, 353 facing each other, a hollow area is defined for the partial movement of the claw arm 261 and the stop portion 263 of the string hooking claw 26. Each slide portion 352, 353 slides corresponding to the switch block slideway 331, 332, respectively. Among them, at least one slide portion 352 (353) has a first and second positioning grooves 3522, 3524 on the downward end surface. When the safety switch block 35 is displaced to the "locked position", the first positioning groove 3522 and one end of the limit member 34 are mutually engaged. When the safety switch block 35 is displaced to the "unlocked position", the second positioning groove 3524 and one end of the limit member 34 are mutually engaged.

The two triggers 354 and 355 are positioned perpendicular to the slides 352 and 353, respectively, and are positioned on the outer surfaces of the slides 352 and 353. They extend through the respective stop slots 321 and 322 and protrude from the outer side of the crossbow case 10 (the housing half 12 and the cover 14). In practice, when the safety trigger 35 is in the "locked" position, the lock plate 351 is positioned above the second stop 246 of the trigger 24, thereby blocking movement of the trigger 24. When the safety trigger 35 is in the "unlocked" position, the lock plate 351 is positioned between the first and second stops 244 and 246 of the trigger 24, preventing it from interfering with movement.

The string release mechanism, as shown in Figures 1 and 5 to 7, includes a string release plucking block 41, a plucking rod 42, a pull rod 43, a rocker 44, a torsion spring 45, a blocking member 46, and an elastic pressure member 47.

The string-release poke block 41 is housed in the cover chamber 141 corresponding to the string-release slot 142 and selectively moves between a "safety position," a "prepared position," and a "release position." It comprises a poke post portion 411, a first poke block portion 412, and a second poke block portion 413, which are sequentially connected.

One end of the aforementioned plucking post 411 extends through the string release slot 142 to the outside of the housing 14, allowing the user to poke and move the string release plucking block 41 to a preset position, such as from the "safe position" to the "ready position."

The first retractable portion 412 has a first slope 4121 at its front end. During implementation, the first slope 4121 is further provided with first and second stepped sections.

The second detent portion 413 is assembled on the side of the first detent portion 412 and has a recess 4131, a second slope 4132, a pivoting groove 4133, and an abutting section 4134.

The recess 4131 is formed at the top of the second locking portion 413.

The second slope 4132 is formed adjacent to the recess 4131 at the rear end of the second locking portion 413.

The hinge groove 4133 is formed on the downward end surface of the second retracting portion 413.

The abutment section 4134 is formed on the front end of the second retracting portion 413.

The aforementioned lever 42 is pivotally mounted on the housing 14 and positioned at a predetermined position within the cover chamber 141, with one end pivotally connected to the pivoting groove 4133 of the second lever portion 413.

The aforementioned pull rod 43 is housed in the cover chamber 141. One end is pivotally connected to the end of the lever 42 away from the second lever portion 413. The other end has a long slot 431 and a vertical arm section 432.

The long slot 431 is formed through the pull rod 43, providing a passage for the first pivot post 1221 to extend through.

The vertical arm section 432 extends upward from the top of the pull rod 43 and is selectively pushed up by the stop portion 263 of the string hook pawl 26, thereby moving the pull rod 43.

The aforementioned rocker 44 is housed in the movable slot 144 and can move up and down and forward and backward. From top to bottom, it comprises a club head 441, a shaft 442, and a hook portion 443. The shaft 442 further includes a push portion 4421 and a retreat portion 4422.

The rod head 441 abuts against the first slope 4121 of the string release paddle 41 (first paddle portion 412).

The push portion 4421 selectively pushes against the safety trigger block 35 (the trigger portion 354) when the rocker 44 moves in the movable groove 144.

The clearance portion 4422 provides clearance for the safety block 35 (slider portion 352) when the rocker 44 moves in the movable groove 144.

When the rocker 44 moves upward in the movable slot 144, the hook portion 443 selectively hooks the latch 25 to rotate, allowing the string hook pawl 26 to release the bowstring.

The aforementioned torsion spring 45 is pivoted at a preset position in the cover chamber 141, with one end abutting the wall of the cover chamber 141 and the other end abutting the top of the second retractor 413. It moves between the recess 4131 and the second slope 4132.

The aforementioned blocking member 46 has one end pivoted on the housing half 12 and abuts against the string hook pawl 26, selectively moving with it. The other end selectively overlaps with the path of the string release paddle 41 when it moves to the "release position." It has an abutting portion 461, a locking portion 462, and a post 463.

One end of the abutment portion 461 is pivotally connected to the third pivot post 1223 of the half housing 12, abutting against one side of the string hook 26.

The latching portion 462 is formed at one end of the abutting portion 461, away from the third pivot post 1223, and latches onto the top end of the string hook 26.

The column 463 is formed on the top end surface of the buckling portion 462.

One end of the elastic pressure member 47 is sleeved on the column 463, and the other end abuts against the wall of the cover chamber 141. Normal pressure is applied to the abutment portion 462 to fit the string hook pawl 26.

Therefore, the above is an introduction to the components and assembly method of the crossbow string unloading mechanism provided by the present invention. The operating features of this embodiment of the present invention are introduced below.

<Normal or after shooting, synchronize the movement of the string release block 41 to a safe position>

In the normal state, as shown in Figures 8, 9, and 16, the string-pulling claw 26 is pushed up by the third reset member 223, causing the claw hook 262 of the string-pulling claw 26 to swing upward.

During this process, the stop 263 of the string-pulling claw 26 pushes the vertical arm 432 of the pull rod 43, pulling the pull rod 43 horizontally toward the nock slot 182. This causes the pivoted lever 42 to swing, causing the release block 41, which is pivoted to the lever 42, to move toward the "safe position."

When the string-release paddle 41 reaches the "safe position," one end of its torsion spring 45 rests in the recess 4131 at the top of the string-release paddle 41 (the second paddle portion 413), securing the paddle 41 in the "safe position." Simultaneously, the retaining element 46, under pressure from the elastic pressure element 47, adheres tightly to the outer periphery of the string-catching claw 26, overlapping the path of the string-release paddle 41 to the "release position."

<Strung and locked simultaneously>

As shown in Figures 4, 8, and 12, the bowstring 92 is drawn through the nock slot 184 into the crossbow case 10 via a string puller (not shown, a prior art technique). This pull pushes against the stop 263 of the string-pulling pawl 26, causing the string-pulling pawl 26 to pivot about the third pivot post 1223. During this process, the string-pulling pawl 26, opposite the end of the pawl hook 262, moves upward, compressing the third reset member 223 and no longer pressing against the first arm 251 of the latch 25. The latch 25, pushed upward by the second reset member 222, pivots back about the second pivot post 1222, causing the first arm 251 of the latch 25 to press against the downward end of the pawl arm 261.

Furthermore, the end of the string-pulling claw 26 near the hook 262 swings downward, causing the stopper 263 to push the locking tab 351 of the safety trigger 35, moving the safety trigger 35 from the "unlocked position" to the "locked position." This causes the sliding tab 352 to separate from the first positioning groove 3522 on the lower end surface of the safety trigger 35 and engage with the limiting member 34 through the second positioning groove 3524. At this point, the locking tab 351 of the safety trigger 35 is located above the second blocking portion 246 of the trigger member 24.

Removing the string puller allows the bowstring 92 to be hooked on the hook 262 of the string hook 26. Because the other end is pressed against the latch 25 (first arm 251), the bowstring 92 cannot be released.

The winding and simultaneous automatic locking (safety engagement) of the watch are now complete. Because the locking tab 351 of the safety trigger 35 is located above the second stop 246 of the trigger 24, the user cannot trigger the trigger 24 to rotate.

<Switch to the ready position for releasing the bowstring>

As shown in FIG12 , when the user needs to release the tension of the bowstring 92 , the user utilizes the peg portion 411 of the string-release peg 41 to manually move the string-release peg 41 from the "safe position" toward the "ready position."

When the string-release paddle 41 is moved to the "ready position," the abutment section 4134 at the front end of the string-release paddle 41 (second paddle portion 413) is blocked by the blocking member 46 in the path, preventing further forward movement. During this process, the torsion spring 45 is forced out of the recess 4131 of the string-release paddle 41 (second paddle portion 413) and positioned on the second slope 4132 of the string-release paddle 41 (second paddle portion 413), exerting a force on the string-release paddle 41 (second paddle portion 413) toward the "release position."

The first slope 4121 of the string-release plectrum 41 (first plectrum portion 412) slightly pushes the rod head 441 of the rocker 44, causing the rocker 44 to move slightly upward (as shown in Figure 13).

At this point, the safety trigger 35 is still in the "locked position," so the trigger 24 is inoperative. This prevents the trigger (not shown) from being accidentally activated, potentially causing a misfire.

<Slightly pull the bowstring to allow the release lever 41 to automatically move from the prepared position to the release position>

Referring to Figures 8, 13-17, the user again slightly pulls the bowstring 92 using the string puller (not shown, a known technique). This pushes against the stop 263 of the string-pulling claw 26, causing the other end of the string-pulling claw 26 to move upward, away from the hook 262. This in turn pushes against the stop 462 of the blocking member 46, causing the blocking member 46 to move upward, away from the string-release block 41 and toward the "release position."

In this way, the torsion spring 45 can smoothly push the string-release paddle 41 toward the "release position." During this process, the first slope 4121 of the string-release paddle 41 (the first paddle portion 412) pushes against the rod head 441 of the rocker 44, causing the entire rocker 44 to move upward.

In addition to imparting upward displacement force to the broom 44, the first slope 4121 also applies a forward thrust to the broom 44, allowing the broom 44 to move upward and forward within the movable groove 144.

When the rocker 44 moves forward, the push portion 4421 of the shaft 442 pushes the safety trigger 35 (trigger portion 354) from the "locked position" to the "unlocked position." Furthermore, when the rocker 44 moves upward, its hook portion 443 pushes the third arm 253 of the latch 25 upward, causing the latch 25 to swing about the second pivot post 1222. This frees the second arm 252 from contacting the claw arm 261 of the string-pulling pawl 26. The third reset member 223 pushes the string-pulling pawl 26 upward, causing the hook 262 on one end of the pawl 26 to swing upward, freeing it from obstruction of the bowstring 92 (see Figure 8).

In this way, the user can use the string puller to release the 92° tension of the bowstring, causing it to slowly exit the crossbow housing 10 and release its kinetic energy, achieving a damage-free crossbow structure while safely releasing the 92° tension of the bowstring.

The above description is merely a preferred embodiment of the present invention and is intended to clarify the features of the present invention. It is not intended to limit the scope of the embodiments of the present invention. Equivalent modifications made by persons of ordinary skill in the art based on the present invention, as well as modifications well known to persons of ordinary skill in the art, should still fall within the scope of the present invention.

10: Crossbow Case

12: Half Shell

14: Shell

142: Release slot

16: Cover plate

182: Nock Groove

184: Nock Groove

322: Limiting slot

35: Insurance Block

411: Dial column part

Claims (8)

A crossbow string unloading mechanism is provided on a crossbow body for releasing the tension of a bowstring, comprising: a crossbow mechanism case, which is accommodated in a preset position of the crossbow body, and comprises a half shell and a shell cover; the half shell is provided with a shell chamber, and is provided with a trigger assembly for restraining the bowstring; the shell cover is provided with a cover chamber, a string release slot which penetrates the shell cover and is connected to the cover chamber, and a movable slot which is provided in a preset position of the cover chamber; The string release plectrum corresponds to the position of the string release slot and is accommodated in the cover chamber. It selectively moves between a safe position, a pre-position, and a string release position. The string release plectrum has a plectrum portion extending through the string release slot on one side, a first slope and an abutment section at the front end, a recess at the top end, a pivot groove at the bottom end, and a second slope at the rear end. A plectrum member is pivotally mounted on the housing cover, and one end thereof is pivotally connected to the pivot groove and moves synchronously. The lever is accommodated in the cover chamber and can move horizontally. One end of the lever is pivoted with the end of the release lever away from the string release block and moves together. The other end has a long slot and a vertical arm section, which is pivoted with the half shell through the long slot. The vertical arm section is selectively pushed up by the trigger group to move the lever. A rocker is accommodated in the movable slot and can move up and down. It has a rod head, a rod body, and a hook portion in order from top to bottom, wherein: the rod head abuts against The first slope is provided; the hook selectively triggers the trigger assembly to release the bowstring; a torsion spring pivotally mounted on the housing, one end of which moves between the recess and the second slope; a blocking member pivotally mounted on the housing half and interacting with the trigger assembly, selectively overlapping the displacement path of the release paddle and abutting the abutment section; and an elastic pressure member, one end of which presses against the blocking member and the other end of which pushes against the housing half, normally pressing the blocking member against the trigger assembly. In the crossbow string unloading mechanism as described in claim 1, a vertical column is formed on the top end surface of the buckling portion, providing a sleeve for one end of the elastic pressure piece. The crossbow string unloading mechanism as described in claim 1, wherein the string release lever comprises a lever portion, a first lever portion, and a second lever portion connected in series in sequence; the first slope is formed at the front end of the first lever portion; the second lever portion is provided on the side of the first lever portion; the recess is formed at the top end of the second lever portion; the second slope is formed adjacent to the recess at the rear end of the second lever portion; the pivot groove is formed on the downward end surface of the second lever portion; and the abutment section is formed on the front end surface of the second lever portion to selectively push against the blocking member. In the crossbow string unloading mechanism described in claim 1, the movable slot has a truncated cone profile that is wide at the top and narrow at the bottom, providing space for the rocker to swing forward and backward. The crossbow string unloading mechanism of claim 1, wherein the trigger assembly comprises: A first reset member, a second reset member, and a third reset member, each housed in the housing chamber, one end of each member abutting a wall of the housing chamber; a trigger member pivotally mounted on the housing half and abutting one end of the first reset member; a latch member pivotally mounted on the housing half and abutting one end of the second reset member, normally abutting the trigger member; and a string-catching claw pivotally mounted on the housing half and abutting one end of the third reset member, such that one end of the string-catching claw normally abuts the latch member and the other end selectively grips the bowstring. The crossbow string unloading mechanism as described in claim 5, wherein the blocking member comprises: an abutting portion abutting against one side of the string hooking claw and having one end pivotally connected to the half housing; and a locking portion formed at one end of the abutting portion and locking against the top end of the string hooking claw. The crossbow string unloading mechanism as described in claim 5, wherein the half-shell is further provided with a trigger safety assembly, including at least a safety block that restricts the movement of the trigger assembly; and the shaft has a push portion for pushing the safety block to move, and a relief portion for partially extending the safety block. The crossbow string unloading mechanism as described in claim 7, wherein the trigger safety assembly comprises: two limit slots formed concentrically through the half-shell and the housing cover; two trigger block slides symmetrically disposed on opposite end surfaces of the half-shell and the housing cover, respectively, and communicating with the matching limit slots; an elastic limiter pivotally mounted on the half-shell, one end of which protrudes from one of the matching trigger block slides; The safety trigger , corresponding to each of the shifting slides and each of the limiting slots, and displaced between a locked position and an unlocked position by external force. It comprises a locking plate portion, two sliding plate portions orthogonally connected to the locking plate portion and slidably mounted on the shifting slides, and two shifting lever portions orthogonally connected to each of the sliding plate portions and extending through each of the limiting slots. Furthermore, one of the sliding plate portions has a first positioning groove and a second positioning groove that mate with one end of the elastic limiting member.