Bowstring tension and release safety device
Patent Information
- Application Number
- TW114112102
- Authority / Receiving Office
- TW · TW
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-10-01
- Estimated Expiration
- 2045-03-27
AI Technical Summary
Existing crossbow drawstring mechanisms are overly complex, leading to difficulties in production and maintenance, and require significant user arm strength for operation.
A bowstring tensioning and release safety device comprising a bracket, slip differential assemblies, brake seat, drive shaft, and winding handle, which allows for effortless tensioning and controlled release of the bowstring, ensuring safety and simplicity.
The device simplifies the bowstring tensioning process, reduces user effort, and ensures a controlled, safe release of kinetic energy, enhancing usability and maintenance efficiency.
Smart Images
Figure TWG2TA001077991_001 
Figure TWG2TA001077991_002 
Figure TWG2TA001077991_003
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of crossbows, and in particular to a bowstring tensioning and release safety device. Prior Technology
[0002] According to the structure of a crossbow commonly used in the market, such as the previous case of Chinese Patent No. 207344, it includes a crossbow body, a crossbow wing horizontally disposed at the front end of the crossbow body, a bowstring connecting the two ends of the crossbow wing, and a crossbow mechanism box attached to the crossbow body and interacting with the bowstring.
[0003] During operation, the user applies force to pull the bowstring to the cocked position, and then performs actions such as nocking the arrow and firing to complete the shooting operation of the crossbow. However, relying solely on the user's arm strength to pull the bowstring is very taxing on the user's arm strength.
[0004] To overcome this deficiency, some manufacturers have proposed a drawstring mechanism to solve this problem. For example, US patents US10948257 and US11913752 have proposed similar mechanisms. The structure of such mechanisms generally consists of a drawstring hook, a reel, and a crank. The drawstring hook pulls the bowstring, and the user cranks the crank connected to the reel to drive the reel to tighten and loosen the drawstring at both ends of the drawstring hook, thus simultaneously pulling the bowstring to the strung position.
[0005] Although there are precedents to teach about the drawstring mechanism, the overall components are too complex, which is not conducive to production and maintenance. Therefore, the current drawstring mechanism really needs to be improved. Summary of the Invention
[0006] In view of the problems and deficiencies of the prior art, one of the objectives of the present invention is to provide a bowstring tensioning and release safety device through structural innovation, so as to overcome the deficiencies of the prior art.
[0007] To achieve the above objectives, this invention proposes a bowstring tensioning and release safety device, which is installed on a crossbow body for retracting and releasing the drawstrings at both ends of a hook string device. It includes a bracket, a slip differential outer assembly, a brake seat, a slip differential inner assembly, a drive shaft, a brake pad, a jacking seat, a jacking shaft collar, a connecting bushing, a deflector ring assembly, a driven shaft, multiple winding reels, a gear, and a winding handle. The slip differential outer assembly, slip differential inner assembly, and brake seat are interconnected and mounted on the bracket, providing a through-hole for one end of the drive shaft. One end of the jacking seat is connected to the jacking shaft collar and the connecting bushing, while the other end, in conjunction with the brake pad, is connected to the drive shaft. The driven shaft, after connecting the winding reels and gear, is pivotally mounted on the bracket and linked to the drive shaft. One end of the winding handle is selectively connected to the connecting bushing to drive the drive shaft. Composed of the above components, it provides users with effortless setting of bowstring tension and ensures safety by providing a slow release of kinetic energy when the bowstring tension is released. Simple Explanation of the Diagram
[0008]
[0009] [Figure 1] is a three-dimensional schematic diagram of an embodiment of the present invention combined with the crossbow body.
[0010] [Figure 2] is a schematic diagram of an embodiment of the present invention.
[0011] [Figure 3] is a schematic cross-sectional view of a partial component of the embodiment shown in Figure 2.
[0012] [Figure 4] is a partial component exploded view of the embodiment shown in Figure 2.
[0013] [Figure 5] is a partial exploded view of the embodiment shown in Figure 4.
[0014] [Figure 6] is a partial component exploded view of the embodiment shown in Figure 5.
[0015] [Figure 7] is a partial component exploded view of the embodiment shown in Figure 6.
[0016] [Figure 8] is a partial component exploded view of the embodiment shown in Figure 7.
[0017] [Figure 9] is an exploded view of the embodiment shown in Figure 8.
[0018] [Figure 10] is a partial component exploded view (a) of the embodiment shown in Figure 9.
[0019] [Figure 11] is a schematic diagram of a partial component of the embodiment shown in Figure 9.
[0020] [Figure 12] is a cross-sectional schematic diagram of the embodiment shown in Figure 11.
[0021] [Figure 13] is a partial component exploded view (II) of the embodiment shown in Figure 9.
[0022] [Figure 14] Schematic diagram of operation of an embodiment of the present invention (I).
[0023] [Figure 15] Schematic diagram of the operation of an embodiment of the present invention (II).
[0024] [Figure 16] Schematic diagram of the operation of an embodiment of the present invention (III).
[0025] [Figure 17] Schematic diagram of the operation of an embodiment of the present invention (IV).
[0026] [Figure 18] Schematic diagram of the operation of an embodiment of the present invention (V). Implementation
[0027] The following description, with reference to the relevant figures, further illustrates embodiments of the bowstring tensioning and release safety device of the present invention. Various objects in the embodiments are depicted according to the scale, size, deformation, or displacement suitable for illustration, rather than being drawn to scale with actual components; this is stated prior to the description. Furthermore, elements in the remaining embodiments that are identical or symmetrically arranged are represented by the same numbers. Additionally, directional terms such as "front," "rear," "left," "right," "up," "down," "inner," and "outer" in the descriptions of the embodiments listed below are used according to the specified view direction and should not be construed as limiting the scope of the present invention.
[0028] Please refer to Figures 1 to 17. The bowstring tensioning and release safety device of the present invention is selectively assembled on a crossbow body A to retract and release the draw ropes B1 at both ends of a hook string device B. It includes a bracket 11, a slip differential outer sleeve 12, a brake seat 13, a slip differential inner sleeve 20, a drive shaft 30, a brake pad 14, an actuator seat 15, an actuator shaft collar 16, a connecting shaft sleeve 40, a toggle ring handle 50, a passive shaft 17, two reels 171, a gear 18, a coil spring 19, a reel handle 60, a left shell cover 70, and a right shell cover 80.
[0029] As shown in Figures 9, 10 and 13, the aforementioned support 11 includes a left side support 112 and a right side support 114 that are adjacent to each other.
[0030] The left side frame 112 has an upper shaft hole 1121 and a lower shaft hole 1122.
[0031] The aforementioned upper shaft hole 1121 of the left frame is formed by penetrating the left side frame 112. In practice, the upper shaft hole 1121 of the left frame provides a first bushing plug C1.
[0032] As shown in Figure 10, the aforementioned lower shaft hole 1122 of the left frame is formed through the left side frame 112, and the hole wall of the lower shaft hole 1122 of the left frame extends axially, adjacent to a polygonal section 1122A and a baffle wall 1122B.
[0033] The right side frame 114 has an upper shaft hole 1141 and a lower shaft hole 1142.
[0034] The aforementioned upper shaft hole 1141 of the right frame is formed through the right side frame 114 and is concentric with the upper shaft hole 1121 of the left frame. In practice, a second bushing C2 is provided to plug the upper shaft hole 1141 of the right frame.
[0035] The aforementioned lower shaft hole 1142 of the right frame is formed through the right side frame 114 and is concentric with the lower shaft hole 1122 of the left frame. In practice, a bearing C3 is provided in the lower shaft hole 1142 of the right frame.
[0036] As shown in Figures 8, 9, 10, 13, and 14, the aforementioned slip differential outer sleeve 12 is installed in the lower shaft hole 1122 of the left frame. It has an outer sleeve hole 121 that penetrates through the slip differential outer sleeve 12, and the wall of the outer sleeve hole 121 has a plurality of inclined wedges 1211. In practice, as shown in Figure 14, each inclined wedge 1211 has a high end 1211A and a low end 1211B at both ends, and different sizes of clearance space are provided through the high end 1211A and the low end 1211B.
[0037] As shown in Figures 9 and 10, the aforementioned brake seat 13 is movably inserted through the outer sleeve hole 121 of the differential outer sleeve 12 and has a brake seat shaft hole 131 formed through the brake seat 13. It further includes a differential shaft 132 and a brake wing 133 respectively disposed at both ends of the brake seat 13.
[0038] The aforementioned differential shaft 132 extends through the outer sleeve hole 121 of the differential outer sleeve 12.
[0039] The aforementioned brake wing 133 abuts against one side of the differential lock outer kit 12.
[0040] The aforementioned slip inner sleeve 20, as shown in Figures 8, 9, 10, 13, and 14, is movably inserted into the outer sleeve hole 121 and selectively forms a slip action with the slip outer sleeve 12, including a slip inner sleeve 21 and a plurality of needle rollers 22.
[0041] The slip inner fitting 21 has an inner sleeve hole 211, a large diameter section 212 and a small diameter section 213.
[0042] The aforementioned inner sleeve hole 211 is formed by penetrating the slip inner sleeve 21.
[0043] The aforementioned large-diameter section 212 and small-diameter section 213 are respectively formed on the outer periphery of both ends of the slip inner sleeve 21 in the extension direction.
[0044] The large diameter section 212 has a plurality of grooves 2121 recessed on its outer surface, and one side of the large diameter section 212 abuts against one side of the outer differential sleeve 12, constraining the axial movement of the inner differential sleeve 21.
[0045] The small diameter section 213 is formed by a plurality of grooves 2131.
[0046] Each of the needle rollers 22 is arranged along each of the grooves 2131 and stacked on the outer periphery of the differential shaft 132 of the brake seat 13.
[0047] During implementation, each needle roller 22 is pushed by the inner differential sleeve 21 and moves along the wedge section 1211 of the outer differential sleeve 12. When each needle roller 22 is moved to the lower end 1211B of the wedge section 1211, the inner differential sleeve 20 and the outer differential sleeve 12 are in a relaxed state with the brake seat 13 (differential shaft 132). When each needle roller 22 is moved to the higher end 1211A of the wedge section 1211, the inner differential sleeve 20 and the outer differential sleeve 12 are in a tight state with the brake seat 13 (differential shaft 132).
[0048] The aforementioned drive shaft 30, as shown in Figures 7, 8, 9, and 13, has a shaft 31, a shaft gear 32, and a lever 33.
[0049] One end of the shaft 31 can movably extend through the brake seat 13 (brake seat shaft hole 131) and protrude outward from the outside of the left side frame 112. The other end is pivotally connected to the lower shaft hole 1142 of the right frame.
[0050] The shaft gear 32 is located on the outer periphery of one end of the shaft 31 and is positioned between the left and right side frames 112 and 114.
[0051] The lever 33 is a radially extending shaft 31 assembly, located at the other end away from the shaft gear 32, and on the outside of the bracket 11.
[0052] As shown in Figures 3, 9, and 10, the aforementioned brake pad 14 has a brake pad shaft hole 141 that extends through the brake pad 14, allowing the drive shaft 30 to extend movably through it. The brake pad 14 is also configured to correspond to the brake vane 133.
[0053] As shown in Figures 9 to 12, the aforementioned actuator seat 15 is sleeved on one end of the transmission shaft 30 and is rotated and reciprocated by the transmission shaft 30. Its two ends are respectively equipped with an actuator shaft 151 and an actuator blade 152, and further include an actuator seat locking hole 153 formed through the actuator seat 15.
[0054] The aforementioned drive shaft 151 has a partially polygonal outer contour, and a slanted groove 1511 is formed radially through the drive shaft 151 (as shown in Figures 11 and 12), providing a through which the paddle 33 of the drive shaft 30 can pass.
[0055] The aforementioned propulsion wing 152 selectively contacts the brake pad 14.
[0056] The aforementioned engine seat locking hole 153 has a large hole section 1531 and a small hole section 1532 at both ends, wherein the large hole section 1531 provides a drive shaft 30 for insertion and connection at one end.
[0057] The aforementioned drive shaft collar 16 is sleeved on the outer periphery of the drive shaft 151, closing the oblique groove 1511 that connects to the external section.
[0058] The aforementioned sleeve 40, as shown in Figures 3, 7, 9, and 10, is fitted onto the outer periphery of the driving shaft 151 of the driving seat 15 and moves with it. It has a plurality of sleeve holes 41 and a fitting groove 42. In practice, the sleeve 40, in conjunction with a locking element, extends through and locks itself into the small hole section 1532 of the locking hole 153 of the driving seat.
[0059] Each of the socket holes 41 is recessed on the other end face of the sleeve 40 away from the driving shaft 151.
[0060] The fitting groove 42 is recessed on the preset end face of the sleeve 40 adjacent to each sleeve hole 41; wherein, the groove wall of the fitting groove 42 is partially recessed with at least one fitting section 421.
[0061] The aforementioned actuating ring handle assembly 50, as shown in Figures 8, 9, and 13, is sleeved on the outer periphery of the large-diameter section 212 of the inner differential sleeve 21, and normally drives the inner differential sleeve 20 to move towards the tensile state. The aforementioned actuating ring handle assembly 50 includes an actuating ring handle 51 and a tension spring 52.
[0062] The actuating ring handle 51 has a ring handle hole 511 and a ring handle 512 at each end; the ring handle hole 511 is formed through the actuating ring handle 51 and is fitted onto the outer periphery of the large diameter section 212 of the sliding inner sleeve 21, and the hole wall has a plurality of engaging ribs 511A that match the slots 2121. The free end of the ring handle 512 protrudes out from the outside of the bracket 11.
[0063] The tension spring 52 is connected at one end to the ring handle 512 and at the other end to the left side frame 112.
[0064] As shown in Figures 3, 7 to 10, the aforementioned passive shaft 17 passes through the left frame upper shaft hole 1121 of the left side frame 112 and the right frame upper shaft hole 1141 of the right side frame 114, and is pivotally connected to the bracket 11.
[0065] Each of the aforementioned reels 171 is respectively assembled at both ends of the passive shaft 17, positioned on the outside of the bracket 11, and together winds up the pull ropes B1 at both ends of the hook string B.
[0066] The aforementioned gear 18 is fitted inside the bracket 11 and assembled on the outer periphery of the driven shaft 17, and engages with the shaft gear 32.
[0067] The aforementioned coil spring 19, as shown in Figures 3, 7, 9, and 13, is sleeved on the outer periphery of the driven shaft 17, with one end connected to the gear 18 and the other end connected to the right side frame 114.
[0068] As shown in Figures 1 to 4, the aforementioned winding handle 60 is selectively inserted into the sleeve hole 41 and the mating groove 42 of the sleeve 40 at one end, and pulls the sleeve 40 to rotate. The winding handle 60 has a plurality of insertion posts 61 and mating posts 62.
[0069] Each of the aforementioned inserts 61 is selectively inserted into the corresponding socket 41 of the sleeve 40.
[0070] The aforementioned mating post 62 is selectively inserted into the mating groove 42 of the sleeve 40, wherein the mating post 62 extends with at least one mating flap 621, which selectively mats with the matching mating section 421.
[0071] The aforementioned left cover 70, as shown in Figures 1 to 3 and 5 to 7, is assembled on the left side of the bracket 11 and has a left rope opening 71 and a cover shaft hole 72.
[0072] The left rope opening 71 is formed through one side of the left shell 70, and matches the position of the preset winding wheel 171 to provide a matching pull rope B1 for insertion.
[0073] The cover shaft hole 72 is formed through one side of the left cover 70 to match the position of the sleeve 40, providing a passage for the sleeve 40 to pass through.
[0074] The aforementioned right shell cover 80, as shown in Figures 1 to 3 and 5 to 7, is assembled on the right side of the bracket 11 and has a right rope opening 81.
[0075] The right rope opening 81 is formed through one side of the right shell 80, and matches the position of the preset winding wheel 171 to provide a matching pull rope B1 for insertion.
[0076] Therefore, the above is an introduction to the components and assembly method of the bowstring tensioning and release safety device of the present invention according to a preferred embodiment. The operating characteristics of the embodiment of the present invention will be introduced below.
[0077] <Under normal circumstances>
[0078] As shown in Figure 1, the pull ropes B1 at both ends of the hook wire B are wound around the outer periphery of each reel 171, so that the hook wire B is adjacent to the bracket 11. And as shown in Figures 14 and 15, the actuating ring handle group 50 is linked to the inner differential sleeve group 20, which normally moves in the direction of the tight state, so that the outer differential sleeve group 12 and the inner differential sleeve group 20 are in a tight state with the brake seat 13 (differential shaft 132).
[0079] During the process, the actuating ring handle 51 is pulled by the tension spring 52, twisting the actuating ring handle 51 and moving the inner differential sleeve 21 and each roller 22, so that each roller 22 is moved to the high end 1211A of the inclined wedge section 1211 of the outer differential sleeve 12, so that each roller 22 respectively presses against the differential shaft 132 of the brake seat 13 and the wall of the outer sleeve hole 121 of the outer differential sleeve 12. In turn, the movement of the brake seat 13, the inner differential sleeve 20, and the outer differential sleeve 12 is synchronously constrained.
[0080] <When releasing the tension of hook string B, pull rope B1, or bowstring>
[0081] As shown in Figures 2, 3, and 15, the traction hook B moves away from the support 11, causing the pull ropes B1 at both ends of the hook B to be released from the reels 171, simultaneously causing each reel 171 to rotate. The force pulling the hook B can come from the user's manual pulling force, or from the bowstring tension released when the hook B is hooked onto the bowstring (not shown in the figure) and the crossbow is fired.
[0082] Each reel 171 spins as the rope B1 is released, and moves in tandem with the driven shaft 17, causing the gear 18 connected to the driven shaft 17 to spin.
[0083] During the rotation of the aforementioned gear 18, the transmission shaft 30, which is connected to the shaft gear 32 that moves in tandem, also rotates, driving the pawl 33 mounted on it to rotate.
[0084] As shown in Figures 15 and 16, the lever 33 is inserted into the oblique groove 1511 of the drive shaft 151 (drive seat 15). When it spins, it moves along the slope of the oblique groove 1511. In conjunction with the oblique direction of the oblique groove 1511, it pushes the drive seat 15 towards the brake seat 13, so that the drive seat 15 (drive blade 152) and the brake seat 13 (brake blade 133) together clamp the brake pad 14 (Figure 16).
[0085] Under normal conditions, the inner differential sleeve 20 and the outer differential sleeve 12 are in a tight state with the brake seat 13 (slip differential shaft 132) (Fig. 14), so the brake seat 13 does not move. When the drive shaft 30 continues to drive the actuator seat 15 to rotate through the oblique groove 1511, the actuator seat 15 (actuator blade 152) and the brake seat 13 (brake blade 133) together clamp the brake pad 14 to form resistance, which will prevent the actuator seat 15 from rotating synchronously and keep the drive shaft 30 stationary.
[0086] At this point, it is no longer possible to release the pull ropes B1 at both ends through the hook string device B. It is necessary to use the lever assembly 50 to release the tightness before continuing.
[0087] The release method is shown in Figures 15 to 18. The user moves the lever handle 51 and pressurizes the tension spring 52. The lever handle 51 is twisted to move the inner differential assembly 21, which moves the lower end 1211B of the inclined wedge section 1211 of each needle roller 22 and the outer differential assembly 12, so that the inner differential assembly 20 and the outer differential assembly 12 are in a relaxed state in conjunction with the brake seat 13 (slip differential shaft 132).
[0088] At this time, the force that stops the drive shaft 30 is only the frictional resistance formed by the joint clamping of the brake pad 14 by the actuator 15 (actuator wing 152) and the brake seat 13 (brake wing 133). Therefore, the ropes B1 at both ends of the hook string B can continue to be pulled out slowly, so as to achieve the purpose of slowly releasing the tension of the bowstring and safely releasing the string.
[0089] When the moon is waxing
[0090] When the user wants to string the bowstring, first pull out the string hook B according to the above steps, then hook the string hook B onto the bowstring, and rotate the winding handle 60 to pull the inserted sleeve 40 and the transmission shaft 30 connected in series to rotate. This causes the shaft gear 32 and the lever 33 on the transmission shaft 30 to rotate together.
[0091] The aforementioned lever 33 is inserted into the oblique groove 1511 of the drive shaft 151 (drive seat 15). When it rotates, it pushes against the groove wall of the oblique groove 1511. In accordance with the oblique orientation of the oblique groove 1511, the drive seat 15 moves away from the brake seat 13.
[0092] When the aforementioned shaft gear 32 rotates, it causes the meshing gear 18 to move in tandem with the driven shaft 17. The winding reels 171 connected to both ends of the driven shaft 17 then jointly wind up the pull ropes B1 at both ends of the hook string device B, causing the hook string device B to pull the bowstring until the bowstring is in the upper string position.
[0093] 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 variations made by those skilled in the art based on the present invention, as well as changes well known to those skilled in the art, should still fall within the scope of the present invention.
[0094]
[0095] 11: Bracket
[0096] 112: Left side frame
[0097] 1121: Left frame upper shaft hole
[0098] 1122: Lower shaft hole of left frame
[0099] 1122A:Polygonal section
[0100] 1122B: Barrier
[0101] 114: Right side frame
[0102] 1141: Right frame upper shaft hole
[0103] 1142: Lower shaft hole of the right frame
[0104] 12: Slip differential outer casing
[0105] 121: Outerwear Hole
[0106] 1211: Oblique wedge segment
[0107] 1211A: High-end
[0108] 1211B: Low-end
[0109] 13: Brake seat
[0110] 131: Brake seat shaft hole
[0111] 132: Slip shaft
[0112] 133: Brake blades
[0113] 14: Brake pads
[0114] 141: Brake pad shaft hole
[0115] 15: Engine Seat
[0116] 151: Drive Shaft
[0117] 1511: Inclined Groove
[0118] 152: Engine Wing
[0119] 153: Engine seat lock hole
[0120] 1531: Large Hole Section
[0121] 1532: Small hole segment
[0122] 16: Driven Shaft Ring
[0123] 17: Passive axis
[0124] 171: Reel
[0125] 18: Gear
[0126] 19: Coil Spring
[0127] 20: Slip-ring inner sleeve assembly
[0128] 21: Slip-line inner kit
[0129] 211: Inner sleeve hole
[0130] 212: Large diameter section
[0131] 2121: Card slot
[0132] 213: Small path section
[0133] 2131: Groove
[0134] 22: Needle roller
[0135] 30: Drive shaft
[0136] 31: Shaft
[0137] 32: Shaft and Gear
[0138] 33: Dial Block
[0139] 40: Sleeve sleeve
[0140] 41: Socket
[0141] 42: Fitting groove
[0142] 421: Fitting Section
[0143] 50: Actuating ring handle assembly
[0144] 51: Move the ring handle
[0145] 511: Ring Handle Hole
[0146] 511A: Engaging rib
[0147] 512: Ring Handle
[0148] 52: Tension Spring
[0149] 60: Reel handle
[0150] 61: Insert post
[0151] 62: Fitting Pillar
[0152] 621: Fitting Wing
[0153] 70: Left shell cover
[0154] 71: Left rope opening
[0155] 72: Shaft hole
[0156] 80: Right shell cover
[0157] 81: Right rope opening
[0158] A: Crossbow body
[0159] B: Hooker
[0160] B1: Pull rope
[0161] C1: First bushing
[0162] C2: Second bushing
[0163] C3: Bearing
Claims
1. A bowstring tensioning and release safety device, selectively mounted on a crossbow for tensioning and releasing the draw ropes at both ends of a string hook, comprising: A bracket, having at least one left bracket lower shaft hole; a differential outer sleeve, assembled in the left bracket lower shaft hole, having an outer sleeve hole through which the differential outer sleeve is formed, and the outer sleeve hole wall having a plurality of oblique wedge sections; a brake seat, movably extending and disposed in the outer sleeve hole, having a differential shaft respectively disposed at both ends of the brake seat and a brake wing, wherein the differential shaft passes through the outer sleeve hole, and the brake wing abuts against one side of the differential outer sleeve and is disposed on the outside of the bracket; a differential inner sleeve assembly, movably disposed between the differential outer sleeve and the differential shaft, including: a differential inner sleeve having: an inner sleeve hole, The inner differential sleeve is formed through the differential shaft, providing a through-hole for the differential shaft. A large-diameter section and a small-diameter section are formed at both ends of the inner differential sleeve, respectively. The large-diameter section abuts against one side of the outer differential sleeve, while the small-diameter section extends through the outer sleeve hole and has a plurality of slots. A plurality of needle rollers are matched with each of the wedge sections and each of the slots and are stacked on the outer periphery of the differential shaft. A drive shaft has a shaft rod, a shaft gear assembled on the outer periphery of the shaft rod, and a lever, wherein: one end of the shaft rod can movably extend through the brake seat and protrude outward from the outside of the bracket, and the other end is pivotally connected to the bracket; a brake pad is corresponding to the brake wing. The system comprises: a brake disc assembly, fitted onto the outer periphery of the shaft; a actuator seat, fitted onto one end of the shaft and positioned on the outside of the bracket, with an actuator shaft and an actuator wing at each end; the actuator shaft having a radially penetrating oblique groove for engaging the lever and selectively causing the actuator wing to abut against the brake pad by the lever's push; an actuator shaft collar, fitted onto the outer periphery of the actuator shaft, closing the oblique groove opening; a connecting sleeve, connected to the actuator shaft assembly, having a plurality of connecting holes; and an actuating ring handle assembly, which normally engages with the differential inner assembly to move it in a stressed state. It includes: a toggle ring handle, one end of which is sleeved on the outer periphery of the slip differential inner sleeve and moves with it, and the other end extends to the outside of the bracket; a tension spring, one end of which is connected to the toggle ring handle and the other end of which is connected to the bracket; a driven shaft that extends through the bracket and is pivotally connected; a plurality of winding reels, respectively assembled at both ends of the driven shaft and disposed on the outer periphery of the bracket, for winding up each of the pull ropes; a gear, assembled on the driven shaft and moving with it, and disposed inside the bracket, engaging the shaft gear; and a winding handle, one end of which selectively corresponds to and is inserted into the sleeve, and pulls the sleeve to rotate, having a post that matches the insertion of each sleeve hole.
2. The bowstring tension and release safety device as described in claim 1, wherein the wall of the lower shaft hole of the left frame extends axially and is adjacent to a polygonal section and a stop wall.
3. The bowstring tensioning and release safety device as described in claim 1, wherein each of the wedge segments has a high end and a low end at both ends.
4. The bowstring tension and release safety device as described in claim 1, wherein: The outer surface of the large-diameter section is recessed with a plurality of slots. The actuating ring handle has a ring handle hole and a ring handle at both ends. The ring handle hole is formed by passing through the actuating ring handle, and the hole wall has a plurality of engaging ribs that match each of the slots. One end of the ring handle is provided with the tension spring assembly and extends to the outside of the bracket.
5. The bowstring tension and release safety device as described in claim 1, wherein: The sleeve has a groove recessed adjacent to each of the sleeve holes, and the groove wall of the groove has at least one groove recessed section; the winding handle has a groove protruding from the groove, and the groove protruding from the groove has at least one groove extending outward, which selectively engages with the groove section.
6. The bowstring tension and release safety device as claimed in claim 1, wherein the bracket includes a left side bracket having a left side bracket upper shaft hole and a left side bracket lower shaft hole formed through the upper and lower sections of the left side bracket; and a right side bracket, assembled with the left side bracket, having a right side bracket upper shaft hole and a right side bracket lower shaft hole formed through the upper and lower sections of the right side bracket.
7. The bowstring tensioning and release safety device as described in claim 1, wherein a left housing and a right housing are respectively assembled on both sides of the bracket, wherein: The left housing has: a left rope opening formed through one side of the left housing, matching one of the winding reels, and providing passage for one of the pull ropes; and a housing shaft hole formed through one side of the left housing, matching the position of the sleeve shaft. The right housing has: a right rope opening formed through one side of the right housing, matching one of the winding reels, and providing passage for one of the pull ropes.
8. The bowstring tension and release safety device as described in claim 1, wherein the bracket contains a coil spring, which is sleeved on the outer periphery of the driven shaft and connected at both ends to the gear and the bracket respectively.