Trigger mechanism for a crossbow

Abstract

The application relates to the technical field of competitive equipment, in particular to a trigger mechanism of a crossbow. The trigger mechanism comprises a support, a trigger system and a crossbow string assembled on the support; the trigger system comprises a trigger and a string hanging locking safety device; the string hanging locking safety device comprises a blocking iron, a blocking iron connecting rod, a blocking iron shifting rod, a trigger connecting rod and a safety knob. In the whole string hanging and firing process of the trigger mechanism, each hinge joint is full rotation friction contact, the area of the contact surface of each hinge joint does not change, the surface pressure ratio of each contact surface does not obviously increase, the friction contact surface does not decrease with the firing, the contact surface pressure ratio does not increase, each moving component does not accelerate wear, and the service life is long.

Description

A triggering mechanism for a crossbow Technical Field

[0001] This invention relates to the field of competitive equipment technology, and more specifically, to a triggering mechanism for a crossbow. Background Technology

[0002] A crossbow is a powerful firing device. Its triggering mechanism mainly consists of a trigger system and a string, with the trigger system being the primary control mechanism for launching the bolt. The safety, operability, and maintainability of the trigger system directly affect the efficiency and safety of the crossbow's use.

[0003] In existing technology, conventional crossbow trigger systems include an automatic safety device with both automatic safety and anti-dry-fire safety functions. The automatic safety device's bowstring sear, safety linkage, safety lever, safety, and trigger seat are hinged to the trigger seat and engage sequentially. Furthermore, the automatic safety device is powered by the bowstring, and its structural dimensions are inherently limited. Each trigger triggering causes sliding friction at each contact point, and the entire firing process involves a decreasing contact surface area, gradually increasing the normal pressure exerted by the bowstring on the contact surface, while also generating frictional wear. When the number of shots increases to a certain extent, and the wear at each contact point exceeds the specified clearance limit (especially noticeable at the point where the contact surface separates), the entire trigger system becomes unusable.

[0004] Therefore, the trigger system of the existing crossbow trigger mechanism has a short service life and urgently needs improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a triggering mechanism for a crossbow, thereby solving the above-mentioned technical problems.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A triggering mechanism for a crossbow includes a bracket, a trigger system mounted on the bracket, and a crossbow string. The trigger system includes a trigger and a string-locking safety device. The string-locking safety device includes a sear, a sear linkage, a sear lever, a trigger linkage, and a safety button. The middle portion of the sear is hinged to the bracket, and its front end has a downward-opening string-locking groove. Its rear end is hinged to the top end of the sear linkage. The bottom end of the sear linkage is hinged to the top end of the sear lever. The middle portions of the trigger linkage and the middle portions of the sear lever are hinged to the bracket via a lever pin. A trigger return spring is connected to the front side of the bottom end of the trigger linkage, and the top end of the trigger return spring is connected to the bracket. The top end of the trigger is fixedly connected to the bottom end of the trigger linkage. The safety button is mounted at the rear of the bracket and can move back and forth along the bracket.

[0008] Preferably, a limit pin is fixed at the bottom end of the sear lever, and a lever return spring is provided below the limit pin; the lever return spring is installed on the lever return spring pin on the upper rear side of the trigger.

[0009] Preferably, a sear reset spring is installed on the upper rear side of the sear; an adjusting bolt for adjusting the pressure of the sear reset spring is installed on the bracket.

[0010] Preferably, a buffer pad is fixed above the front part of the sear.

[0011] Beneficial effects: Compared with the prior art, in the entire process of string hanging and firing, the triggering mechanism of the present invention has full-circumference rotation friction contact at each hinge point. The area of ​​the contact surface at each hinge point does not change, and the surface pressure ratio of each contact surface does not increase significantly. There will be no situation where the friction contact surface decreases with firing, resulting in an increase in the surface pressure ratio. The moving components will not experience accelerated wear, and the service life is long. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the triggering mechanism of the present invention in the state of preparing to hang the string;

[0013] Figure 2 is a schematic diagram of the state of the trigger mechanism in the stringing process described in this invention;

[0014] Figure 3 is a schematic diagram of the state of the triggering mechanism after the arrow is loaded and the string is attached according to the present invention.

[0015] Figure 4 is a schematic diagram of the state after the triggering mechanism of the present invention is fired.

[0016] In the diagram: 1-Bracket; 2-Crossbow; 3-Connecting rod pin; 4-Sear; 5-Sear pin shaft; 6-Lever pin; 7-Sear pin; 8-Sear lever; 9-Sear connecting rod; 10-Trigger connecting rod; 11-Anti-air release plate; 12-Adjusting bolt; 13-Safety button; 14-Push-pull pin; 15-Trigger; 16-Lever return spring; 17-Buffer pad; 18-Hook; 19-Limit pin; 20-Trigger return spring pin; 21-Trigger return spring; 22-Sear return compression spring; 23-Crossbow string; 24-Rivet; 25-Lever return spring pin; 26-Anti-air release plate torsion spring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Examples

[0018] Referring to Figures 1-4, the triggering mechanism of the crossbow in this embodiment includes a bracket 1, a trigger system mounted on the bracket 1, and a crossbow string 23. The trigger system includes a trigger 15 and a string-locking safety device.

[0019] The string-locking safety device includes a sear 4, a sear connecting rod 9, a sear lever 8, a trigger connecting rod 10, and a safety button 13. The middle part of the sear 4 is hinged to the bracket 1 via a sear pin 5. Its front end has a downward-opening string-hanging groove, and its rear end is hinged to the top of the sear connecting rod 9 via a sear pin 7. A sear return spring 22 is installed on the upper rear side of the sear 4; an adjusting bolt 12 for adjusting the pressure of the sear return spring 22 is installed on the bracket 1. A buffer pad 17 is fixed above the front part of the sear 4.

[0020] The bottom end of the sear connecting rod 9 is hinged to the top end of the sear lever 8 via a connecting rod pin 3. The middle part of the trigger connecting rod 10 and the middle part of the sear lever 8 are hinged to the bracket 1 via a lever pin 6. The bottom end of the sear lever 8 is fixed with a limit pin 19, and a lever return spring 16 is provided below the limit pin 19; the lever return spring 16 is installed on the lever return spring pin 25 on the upper rear side of the trigger 15.

[0021] The trigger link 10 has a spring hook at its bottom front side, and a trigger return spring 21 is connected to the spring hook. The top of the trigger return spring 21 is connected to the trigger return spring pin 20 at the bottom of the bracket 1. The top of the trigger 15 is riveted to the bottom of the trigger link 10 by two rivets 24.

[0022] The safety button 13 is mounted on the tail of the bracket 1 and can move back and forth along the bracket. A U-shaped slot with an opening facing downward is provided at the bottom of the safety button 13, and a locking block is provided on the top surface of the tail end of the trigger linkage 10. After firing, the locking block is engaged in the U-shaped slot.

[0023] An anti-aircraft trigger plate 11 is disposed below the sear 4. The middle part of the anti-aircraft trigger plate 11 is hinged to the bracket 1 via a pin, and an anti-aircraft trigger plate torsion spring 26 is installed on the pin. The bottom end of the anti-aircraft trigger plate 11 is provided with a barb. The front end of the trigger linkage 10 is provided with an upward-curving hook 18. In the non-firing state, the barb at the bottom end of the anti-aircraft trigger plate 11 is engaged with the hook 18; after the trigger is engaged and before firing, the top of the anti-aircraft trigger plate 11 touches the bottom of the front end of the sear 4.

[0024] The working principle of the triggering mechanism of the crossbow described in this invention is briefly described as follows:

[0025] Figure 1 shows the state of being ready to be strung. The sear 4, sear connecting rod 9, sear lever 8, and trigger connecting rod 10 are assembled by hinges. The hinge points can rotate flexibly, and the sear 4, sear connecting rod 9, and sear lever 8 form a double rocker mechanism.

[0026] As shown in Figure 2, when the bowstring 23 is engaged, the lines connecting the three hinge points—the sear pin 7, the connecting rod pin 3, and the lever pin 6—are essentially straight. Simultaneously, the lower part of the sear lever 8 contacts the trigger linkage 10. The clamping force of the sear lever 8 is provided by the sear lever return spring 16, ensuring that the center of the connecting rod pin 3 is to the left of the line connecting the center of the sear pin 7 and the center of the lever pin 6, forming a locking mechanism. The greater the string engagement force, the more reliable the locking. At the same time, the safety button 13 also moves to the left to the safe position.

[0027] Figure 3 shows the state after the anti-aircraft gun is loaded with arrows. The anti-aircraft release plate 11 rotates clockwise, and the barb at its bottom end disengages from the hook of the trigger linkage 10, so that the anti-aircraft release safety is opened before firing. Push the safety button 13 to the right to the set position.

[0028] Figure 4 shows the firing state. Only a small force is needed to pull the trigger 15, causing the trigger linkage 10 to rotate around the lever pin 6. The trigger linkage 10 simultaneously rotates the sear lever 8. After the sear lever 8 rotates slightly, the center of the linkage pin 3 moves to the right of the line connecting the center of the sear pin 7 and the center of the lever pin 6, releasing the locking state. The sear 4 rotates rapidly counterclockwise around the sear pin shaft 5, and the crossbow string 23 quickly disengages from the sear 4, completing one firing cycle of the crossbow bolt 2.

[0029] At the same time, the sear 4 rotates under the action of the sear reset spring 22, and the top of the front end of the sear 4 contacts the buffer pad 17. The pressure of the sear reset spring 22 can be adjusted by the adjusting bolt 12.

[0030] As shown in Figure 2-4, during the entire firing process, the locking force of the string-locking safety device is determined by the tension of the crossbow string 23; the greater the tension of the crossbow string 23, the more reliable and safe the locking is.

[0031] The foregoing has shown and described the basic principles, main features, and technical characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The descriptions in the above embodiments are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. A triggering mechanism for a crossbow, comprising a support (1), a trigger system mounted on the support (1), and a crossbow string (23); characterized in that: The trigger system includes a trigger (15) and a string-locking safety device; the string-locking safety device includes a sear (4), a sear link (9), a sear lever (8), a trigger link (10), and a safety button (13); the middle part of the sear (4) is hinged to the bracket (1), its front part is provided with a string-locking groove with an opening facing downwards, and its tail end is hinged to the top end of the sear link (9); the bottom end of the sear link (9) is hinged to the top end of the sear lever (8); the middle part of the trigger link (10) and the middle part of the sear lever (8) are hinged to the bracket (1) through a lever pin (6); the trigger link (15) is hinged to the bracket (1) and the safety button (13); the middle part of the trigger link (10) and the middle part of the sear lever (8) are hinged to the bracket (1) through a lever pin (6); the middle part of the trigger link (10) and the safety button (13) are hinged to the bracket (1) and the safety button (14). The bottom front of the trigger (0) is connected to a trigger return spring (21), and the top of the trigger return spring (21) is connected to the bracket (1); the top of the trigger (15) is fixedly connected to the bottom of the trigger linkage (10); the safety button (13) is assembled at the tail of the bracket (1) and can move back and forth along the bracket; the bottom of the sear lever (8) is fixed with a limit pin (19), and a lever return spring (16) is provided below the limit pin (19); the lever return spring (16) is installed on the lever return spring pin (25) on the upper rear side of the trigger (15); the middle of the sear (4) is connected by the sear pin. The shaft (5) is hinged to the bracket (1), and its front end is provided with a string-hanging groove with an opening facing downwards. The tail end is hinged to the top of the sear connecting rod (9) through the sear pin (7). The middle part of the trigger connecting rod (10) and the middle part of the sear lever (8) are hinged to the bracket (1) through the lever pin (6). When the crossbow string (23) is hung, the line connecting the three hinge points of the sear pin (7), the connecting rod pin (3), and the lever pin (6) is basically straight. At the same time, the lower part of the sear lever (8) contacts the trigger connecting rod (10). The pressing force of the sear lever (8) is provided by the sear lever return spring (16), and ensures that the middle part of the connecting rod pin (3) is in contact with the trigger connecting rod (10). The center of the sear pin (7) is on the left side of the line connecting the center of the lever pin (6), forming a locked state; when the trigger (15) is pulled, the trigger linkage (10) rotates around the lever pin (6); the trigger linkage (10) drives the sear lever (8) to rotate simultaneously; when the sear lever (8) rotates slightly, the center of the linkage pin (3) moves to the right side of the line connecting the center of the sear pin (7) and the center of the lever pin (6), and the locked state is released; the sear (4) rotates rapidly counterclockwise around the sear pin shaft (5), and the crossbow string (23) quickly disengages from the sear (4), thus completing one firing process of the crossbow bolt (2).

2. The triggering mechanism of the crossbow according to claim 1, characterized in that: A sear reset spring (22) is installed on the upper rear side of the sear (4); an adjusting bolt (12) for adjusting the pressure of the sear reset spring (22) is installed on the bracket (1).

3. The triggering mechanism of the crossbow according to claim 2, characterized in that: A buffer pad (17) is fixed above the front part of the sear (4).

Images