TWI832326B - Crossbow silent drawstring structure - Google Patents

Abstract

The invention discloses a crossbow silent string puller structure, which is used to retract and release the string puller of a hook string. It includes a spindle, a crank handle, a plurality of reels, a shell, a bushing, and a plurality of covers. , plural rollers, plural limit pieces, and a clutch wrench. The mandrel has a positioning sleeve. The crank handle is assembled at one end of the spindle. Each reel is arranged at both ends of the mandrel for winding the drawstring. The bushing is assembled on the housing and has a movable hole for the spindle to extend through, and a plurality of clutch grooves provided along the wall of the movable hole. Each capping sleeve is attached to the outer peripheral side of the mandrel and assembled at both ends of the shell. Each roller is arranged in each clutch groove respectively. Each limiting piece is arranged at both ends of the positioning sleeve and is connected to the spindle and the outer peripheral side of each roller. One end of the clutch wrench is connected to the spindle and the outer peripheral side of each roller, and the other end extends to the outside of the housing. Through the composition of the above-mentioned components, the string hook is hooked to the bowstring of the crossbow and cooperates with the drawstring of the string hook to retract and release the string, thereby achieving the purpose of silent winding.

Description

Crossbow silent drawstring structure

The present invention relates to the technical field related to crossbows, and in particular, to a crossbow silent string puller structure.

According to reports, the common crossbow structure generally includes a bow body, a set of bow arms located at one end of the bow body, and a set of bow strings located at both ends of the bow arms.

During operation, the user exerts force to pull the bow string to the winding position, and completes the crossbow archery operation in conjunction with actions such as cocking and firing. However, relying solely on the strength of the user's arm to pull the bow string consumes a lot of the user's arm strength.

In order to overcome this shortcoming, some people have proposed string pulling mechanisms to solve this shortcoming, such as US patents US6874491, US7100590, US8375928, US8443790, US8689774, US6286496, etc. The structure generally includes a string hook, a reel and It is composed of a rocking handle. The bow string is hooked by the string hook, and the user shakes the crank handle connected to the reel, driving the reel to retract and release the pull ropes at both ends of the string hook, and simultaneously pulling the bow string to the winding position.

The principle of the above-mentioned previous reel is to use the gear ratio to convert the driving force applied to the crank handle by the user through the interaction of multiple internal gears. In order to avoid loosening during the process, the reel will be equipped with a one-way mechanism (such as a one-way ratchet). However, such a structural design will produce mechanical noise during operation and interfere with the use of the crossbow, especially during hunting. When active.

In view of the above-mentioned problems and deficiencies in the prior art, one purpose of the present invention is to provide a crossbow silent string puller structure through structural innovation in order to overcome the deficiencies in the prior art.

In order to achieve the above object, the present invention proposes a crossbow silent string puller structure, which is used to collect and release the string puller of a string hook, and includes a spindle, a cranking handle, a plurality of reels, a shell, and a bushing. , a plurality of covers, a plurality of rollers, a plurality of limit pieces, and a clutch wrench. The mandrel has a positioning sleeve. The crank handle is assembled at one end of the spindle. Each reel is arranged at both ends of the mandrel for winding the drawstring. The bushing is assembled on the housing and has a movable hole for the spindle to extend through, and a plurality of clutch grooves provided along the wall of the movable hole. Each capping sleeve is attached to the outer peripheral side of the mandrel and assembled at both ends of the shell. Each roller is arranged in each clutch groove respectively. Each limiting piece is arranged at both ends of the positioning sleeve and is connected to the spindle and the outer peripheral side of each roller. One end of the clutch wrench is connected to the spindle and the outer peripheral side of each roller, and the other end extends to the outside of the housing. Through the composition of the above-mentioned components, the string hook is hooked to the bowstring of the crossbow and cooperates with the drawstring of the string hook to retract and release the string, thereby achieving the purpose of silent winding.

10: string hook

12: Pull rope

22: mandrel

222: Assembly hole

24: Positioning bushing

26:Crank

28:Reel

31: Shell

311:Assembling shaft hole

311A: Large diameter section

311B: Small path section

312:Assembly column

313:Contact slot

32: Bushing

321: Movable hole

322:Clutch groove

322A: Free section

322B: Constraint section

33:Block

331: Pivot hole

34: Capping sleeve

35:Roller

36:Limiting piece

361: first piercing

362: Limit groove

40:Clutch wrench

41:Clutch plate

411: Ring Department

411A: Second perforation

412:Oval hole

413:Extension

42: Connector

43: Elastic element

51:wheel cover

511: Setback hole

90:Crossbow

92: Assembly hole

93:Bowstring

[Figure 1] A schematic three-dimensional view of an embodiment of the present invention.

[Figure 2] is a schematic diagram of the embodiment shown in Figure 1 from another perspective.

[Fig. 3] is an exploded schematic diagram of the embodiment shown in Fig. 1.

[Fig. 4] is an exploded schematic diagram of partial components of the embodiment shown in Fig. 3.

[Fig. 5] is a schematic cross-sectional view of the embodiment shown in Fig. 1.

[Figure 6] is a schematic diagram of an embodiment of the crossbow assembly according to the present invention.

[Figure 7] is a cross-sectional operating schematic diagram (1) of the embodiment of the present invention.

[Figure 8] is a schematic cross-sectional view (2) of the embodiment of the present invention.

[Fig. 9] is a schematic cross-sectional view (3) of the embodiment of the present invention.

[Fig. 10] is a schematic cross-sectional view (4) of the embodiment of the present invention.

[Fig. 11] is a schematic cross-sectional view (5) of the embodiment of the present invention.

[Figure 12] is a schematic cross-sectional view (6) of the embodiment of the present invention.

[Fig. 13] is a partial schematic diagram of the embodiment shown in Fig. 11.

[Fig. 14] is a partial schematic diagram of the embodiment shown in Fig. 12.

Please refer to the relevant drawings below to further describe the structural embodiment of the crossbow silent string puller of the present invention. Various objects in the embodiments are drawn according to the proportions, sizes, deformations or displacements suitable for illustration, rather than according to the proportions of actual components, and are explained first. The same and symmetrically arranged components in the remaining embodiments are represented by the same numbers. In addition, directional terms such as "front, rear, left, right, upper, lower, inner, outer" in the description of the embodiments listed below are expressed according to the specified viewing direction and cannot be construed as limitations of the present invention.

Please refer to Figures 1 to 7. The structure of the silent crossbow string puller of the present invention is used to collect and release the pull cords 12 at both ends of a string hook 10, and includes a spindle 22, a plurality of reels 28, and a shell. A body 31, a bushing 32, a plurality of covers 33, a plurality of rollers 35, a plurality of limiting pieces 36, a clutch wrench 40, and a plurality of wheel covers 51.

The above-mentioned mandrel 22 has a preset contour and a positioning sleeve 24 is provided on the outer peripheral side. During implementation, a set of connecting holes 222 are respectively recessed in the sectional surfaces at both ends of the mandrel 22 to provide a crank handle 26 for assembly. In addition, the positioning sleeve 24 and the spindle 22 can be integrally formed. During implementation, the assembly hole 222 is a polygonal hole.

The above-mentioned reels 28 are respectively arranged at both ends in the extending direction of the mandrel 22 to provide winding ropes 12 at both ends of the string hook 10 .

The above-mentioned housing 31 has an assembly shaft hole 311, a plurality of assembly posts 312, and a plurality of connecting grooves 313.

The assembly shaft hole 311 is formed into a plurality of stages through the housing 31. Each stage includes two large-diameter sections 311A arranged at both ends of the assembly shaft hole 311, and a small-diameter section arranged between each large-diameter section 311A. 311B; wherein, the aperture cross section of the small diameter section 311B is polygonal.

Each of the assembly posts 312 is formed on the outer peripheral side of one end of the housing 31 and is used to be inserted into the assembly hole 92 at the rear end of the bow body 91 of a crossbow 90 (shown in FIG. 6 ). During implementation, each assembly column 312 is selected from columns with different geometric profiles or columns with different column diameters, and is arranged at a radial position of the assembly shaft hole 311 .

Each connecting groove 313 is recessed and formed at a preset position on the cross-section at both ends of the housing 31 .

The above-mentioned bushing 32 is assembled in the small diameter section 311B of the assembly shaft hole 311 of the housing 31 and has a movable hole 321 and a plurality of clutch grooves 322. When implemented, the outer contour of the bushing 32 is polygonal.

The movable hole 321 is formed through the bushing 32 to allow the mandrel 22 to extend through and the positioning sleeve 24 to be accommodated.

The clutch grooves 322 are recessed along the wall of the movable hole 321; each clutch groove 322 (as shown in Figure 7) has a free section 322A in the same rotation direction, and each clutch groove 322 has a free section 322A in the opposite rotation direction. The constrained section 322B, and the groove depth of the free section 322A is larger than the constrained section 322B.

Each of the above-mentioned covers 33 is assembled corresponding to the large diameter section 311A of the assembly shaft hole 311 of the housing 31 respectively. Each of the covers 33 has a pivot hole 331 formed through the cover 33 for the mandrel 22 to extend. During implementation, a cover sleeve 34 is provided between the wall of the pivot hole 331 and the spindle 22 .

Each of the above-mentioned rollers 35 is respectively provided corresponding to each clutch groove 322, and is partially in contact with the positioning sleeve 24 of the spindle 22.

Each of the above-mentioned limiting pieces 36 has a slightly annular outline and is disposed against both ends of the positioning sleeve 24. It is arranged at both ends of each roller 35 and has a first through hole 361 and a plurality of limiting grooves 362.

The first through hole 361 is formed through the limiting piece 36 to allow the mandrel 22 (capping sleeve 34) to extend through.

The limiting grooves 362 are recessed on the outer circumferential side of the limiting piece 36 and are annular and equally spaced to accommodate one end of each matching roller 35 .

The above-mentioned clutch wrench 40 is arranged adjacent to each limiting piece 36 and includes two clutch plates 41, a connecting piece 42, and an elastic element 43.

Each of the clutch plates 41 has a ring portion 411 , a plurality of elliptical holes 412 and an extension portion 413 .

The aforementioned ring portion 411 cooperates with a second through hole 411A to form an annular outline. The second through hole 411A is formed through the clutch plate 41 to allow the spindle 22 (the capping sleeve 34) to extend through.

Each oval hole 412 is formed through the clutch plate 41 and is arranged in an annular shape on the ring portion 411 to provide one end of each matching roller 35 to penetrate and match each limiting groove 362 on the limiting piece 36. And the hole diameter is larger than the limiting groove 362.

The aforementioned extending portion 413 is formed by extending outward from the outer peripheral side of the ring portion 411 , and one end of the extending portion 413 extends through the connecting groove 313 of the housing 31 to the outside of the housing 31 .

The connecting member 42 is connected to the extension portion 413 of each clutch plate member 41 that protrudes to the outside of the housing 31, so that each clutch plate member 41 can pivot synchronously with the spindle 22 (the cap sleeve 34) as the axis.

The two ends of the elastic element 43 are respectively connected with the matching cover 33 and the clutch plate. Piece 41 is connected.

The above-mentioned wheel covers 51 are respectively assembled at both ends of the housing 31 and matched with the outer peripheral side of each reel 28 . And each wheel cover 51 has a relief hole 511 formed through the wheel cover 51 to provide one end of the spindle 22 to extend through.

Therefore, the above is an introduction to the structural components and assembly methods of a crossbow silent stringer according to a preferred embodiment of the present invention. Now, the operating characteristics of the embodiment of the present invention are introduced as follows.

As shown in FIG. 6 , when the user needs to string the crossbow 90 , the user can use the assembly post 312 on the casing 31 and insert it into the assembly hole 92 corresponding to the rear end of the bow body 91 to complete the assembly. When not in use, it can be removed and stored directly to avoid interfering with the user's shooting of the crossbow 90.

As shown in Figures 7 and 8, under normal conditions, the extension 413 of the clutch plate 41 of the clutch wrench 40 is pulled by the elastic element 43, so that each elliptical hole 412 of each clutch plate 41 synchronously clamps each roller 35 toward the clutch groove. The constraint section 322B at one end of 322 moves in the direction. Then, each roller 35 is pressed against the positioning sleeve 24 of the spindle 22, and the positioning spindle 22 and the reel 28 assembled therewith cannot pivot in the preset direction.

When the user wants to hook the bowstring 93 of the crossbow 90, as shown in Figures 9 and 10, he first pulls the connecting piece 42 of the clutch wrench 40 so that it synchronously drives each clutch plate 41 to pivot around the spindle 22. Turn. During the process, each elliptical hole 412 of the clutch plate 41 synchronously clamps both ends of each roller 35 and moves from the constrained section 322B of the clutch groove 322 to the free section 322A.

When each roller 35 is displaced to the free section 322A, the spindle 22 is no longer constrained by each roller 35 and can pivot freely. At this time, the user can pull the string hook 10 to simultaneously release the winding on the reel 28 When the string hook 10 can hook the string 93 of the crossbow 90, the clutch wrench 40 (connector 42) can be released to return the clutch wrench 40 to the normal state (details as above). described).

At this time, the user can shake the rocking handle 26 assembled at one end of the spindle 22 to drive the spindle 22 and the reel 28 connected thereto to pivot synchronously. During the process, the spindle 22 (positioning sleeve 24) faces toward The free section 322A of the bushing 32 (clutch groove 322) rotates in the direction of synchronously pulling each roller 35 to move towards the free section 322A of the clutch groove 322, so each roller 35 will not pivot against the spindle 22 (positioning sleeve 24). Turn to form a stop, allowing the reels 28 at both ends of the mandrel 22 to retract the drawstring 12 of the string hook 10, and simultaneously pull the bowstring 93 to move in the winding direction until the bowstring 93 is pulled to the winding position.

At this time, the user can turn the connecting piece 42 of the clutch wrench 40 to allow the spindle 22 to pivot freely, so that the user can detach the string hook 10 from the bow string 93 and then release the clutch wrench 40 to synchronize it. Shake the rocking handle 26 to drive the mandrel 22 to retract the excess rope 12 of the string hook 10 until the string hook 10 is retracted to the preset position.

When the bowstring 93 is being pulled, a reaction force will be exerted on the string hook 10 (pulling rope 12). Therefore, during the above process, the crank handle 26 no longer exerts force on the spindle 22 (positioning sleeve 24) for some reason. , the spindle 22 (positioning sleeve 24) will pivot in the opposite direction due to the reaction force, so as to move each roller 35 toward the constraining section 322B of the clutch groove 322, thereby achieving the limitation of one-way action and overcoming the previous technical problems. There are defects such as one-way gear operation noise.

In addition, as shown in FIGS. 11 to 14 , during the above process of turning the clutch wrench 40 , the structural design of each elliptical hole 412 on each clutch plate 41 is larger than the limiting groove 362 of the limiting piece 36 , so when the clutch plate When the member 41 pivots with the mandrel 22 as the axis, through this gap difference, the hole walls of each elliptical hole 412 impact each roller 35, so that each roller 35 is displaced, so as to lower each roller 35. The maximum static friction allows users to operate more effortlessly and smoothly.

The above descriptions are only preferred embodiments of the present invention. They are intended to clarify the characteristics of the present invention and are not intended to limit the scope of the embodiments of the present invention. Those skilled in the art may make equivalent changes based on the present invention. ,as well as Changes that are well known to those skilled in the art should still fall within the scope of the present invention.

10: string hook

12: Pull rope

26:Crank

31: Shell

312:Assembly column

40:Clutch wrench

51:wheel cover

Claims (10)

A crossbow silent string puller structure, which is used to collect and release one of the pull cords at both ends of a hook stringer, including: A mandrel has a positioning sleeve located on the outer peripheral side; A cranking handle is selectively assembled at one end of the mandrel; A plurality of reels are respectively assembled at both ends of the mandrel to provide winding of the pulling rope; A housing having an assembly shaft hole formed through the housing and a plurality of recessed connecting grooves formed at both ends of the housing; A bushing is assembled in the assembly shaft hole and has: A movable hole is formed through the bushing to provide penetration of the spindle and accommodation of the positioning bushing; and A plurality of clutch grooves are recessed along the wall of the movable hole, and each clutch groove has a free section in the same rotation direction, and each clutch groove has a constraint section in the opposite rotation direction; A plurality of covers are assembled on the housing respectively corresponding to the two ends of the assembly shaft hole, and are sleeved on the outer peripheral side of the mandrel; A plurality of rollers are respectively provided corresponding to each clutch groove, and are partially in contact with the positioning sleeve; A plurality of limiting pieces are respectively provided against both sides of the positioning sleeve, and have a first through hole for the mandrel to penetrate, and a plurality of limiting grooves for one end of the matching roller to penetrate; and A clutch wrench is provided adjacent to each limit piece to selectively displace each roller, including: A plurality of clutch plates have a ring portion pivotally connected to the outer peripheral side of the spindle, a plurality of rings provided in the ring portion for one end of each matching roller to extend through, and a ring extending outward from the ring portion. An extension part, and one end of the extension part extends through the matching connecting groove to the outside of the housing; A connecting piece is connected to the extension portion of each clutch plate protruding to the outside of the housing; and An elastic element is provided with two ends respectively connected to the matching cover and the extension part. The crossbow silent string puller structure as claimed in claim 1, wherein a cover bushing is provided between the pivot hole wall and the spindle. The crossbow silent string puller structure as claimed in claim 1, wherein the two ends of the housing are respectively equipped with wheel covers, and each wheel cover has a relief hole for one end of the spindle to extend through. The crossbow silent string puller structure as claimed in claim 1, wherein at least one end of the mandrel is recessed with a set of receiving holes in the sectional surface. The crossbow silent string puller structure as claimed in claim 1, wherein the aperture of each of the elliptical holes is larger than that of each of the limiting grooves. The crossbow silent string puller structure as claimed in claim 1, wherein the outer peripheral side of the housing has a plurality of assembly posts for matching a plurality of assembly holes provided on a crossbow. The crossbow silent string puller structure as claimed in claim 6, wherein each assembly column is selected from one or a combination of columns with different geometric profiles or columns with different column diameters. The crossbow silent string puller structure as claimed in claim 1, wherein the assembly shaft hole has a plurality of levels, including a large diameter disposed at both ends of the assembly shaft hole. segments and a small diameter segment arranged between the large diameter segments. The crossbow silent string puller structure as claimed in claim 8, wherein the bushing is assembled in the small diameter section; and each cover is assembled corresponding to each large diameter section. The crossbow silent string puller structure as claimed in claim 8, wherein the aperture section of the small diameter section is polygonal, and the outer contour of the bushing is polygonal.

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