TWI691697B - Crossbow that reduces the size of the crossbow - Google Patents

Abstract

The present invention discloses a crossbow that reduces the volume of a crossbow. The crossbow includes a crossbow body, a crossbow bow provided on the crossbow body, two pulley sets provided at both ends of the crossbow bow, and a main string connected to each pulley set and Two pairs of strings. Among them, each pulley block includes a main shaft, a set of main chord gears and a pair of chord gears which are connected to the outer peripheral side of the main shaft. By the composition of the above-mentioned components, the angle when each auxiliary string is connected with each pulley block can be adjusted, and the pulling force applied to the pulley block can be reduced.

Description

Crossbow that reduces the size of the crossbow

The invention relates to the technical field related to sports equipment, in particular to a crossbow which reduces the volume of a crossbow.

The structure of the conventional crossbow generally includes a crossbow body, a crossbow that is laterally provided at the front end of the crossbow body, and a bowstring connecting the two ends of the crossbow. For the detailed structure, refer to my country Patent Announcement No. I582373.

Conventional crossbows are laterally protruding from the sides of the crossbow body, and the length of the crossbow forms the lateral volume of the crossbow, which will cause great problems for users who carry the crossbow, especially in the woods or in small spaces When moving inside, the horizontal crossbow can easily hinder or even restrict the user's movement.

In order to overcome this deficiency, some practitioners have proposed the teaching of the structure of the crossbow (as shown in Figures 17 to 19). In addition to maintaining the power requirements of the original crossbow, it can also greatly reduce the horizontal length of the crossbow to solve the problem. Knowing that the crossbow is too large in size and lacks.

The structure of a conventional multi-directional crossbow generally includes a multi-directional crossbow 91, two pulley sets 92 pivoted at both ends of the multi-directional crossbow, a main string 94 connecting each pulley set 92 and crossing the crossbow 93 above, and two connections Each pulley block 92 penetrates the auxiliary string 95 of the crossbow 93. Although the conventional multi-directional crossbow structure can effectively improve the lack of the transverse length of the crossbow, other problems arise. For example, the conventional pulley set 92 includes a shaft 922 and a coaxial connection. A main chord 924 and a secondary chord 926, and it can be seen from the figure that the main chord 94 and the secondary chord 95 are connected to the main chord 924 and the auxiliary chord 926 of different diameters respectively, and the two ends of the axle 922 are connected The pivot is located at the end of the multi-directional crossbow 91, so the axle 922 needs to bear the tension of the main string 94 and the auxiliary string 95 (the main string 924 and the auxiliary string 926) and the reaction force of the multi-directional crossbow 91, resulting in the axle The strength of 922 has been tested.

In addition, the main string wheel 922 of the pulley group 92 at both ends of the multi-directional crossbow bow 91 is connected to the main string line 94 around it in a horizontal manner, and the main string line 94 is horizontally arranged above the crossbow body 93, and the auxiliary string line 95 In order to avoid disturbing the movement of the main string 94, it is set under the main string 94 and after passing through the crossbow 93, it is connected to the auxiliary string 95 of each pulley block 92 at an oblique angle θ. It is not difficult to see from Figure 18 that the slant angle θ of the auxiliary chord line 95 is connected to the horizontally connected auxiliary chord 926, and a pulling force is formed on the auxiliary chord 926, which causes the frictional force of the auxiliary chord 926 during rotation and the axle 922 Increase, the acceleration wheel shaft 922, auxiliary chord 926, auxiliary chord 95 and other components wear; and the tension of the auxiliary chord 95 to the auxiliary chord 926, when the auxiliary chord 95 is tight (Figure 19), due to the oblique angle θ The increase will be more obvious.

For this reason, how to protect the axle 922 and reduce the slant angle θ of the auxiliary chord line 95 will help reduce the loss of component wear.

In view of the above-mentioned problems and deficiencies of the conventional art, the main purpose of the present invention is to provide a crossbow that reduces the volume of the crossbow. Through structural design, the above-mentioned deficiencies of the conventional crossbow are solved.

According to the above object of the present invention, the present invention proposes a crossbow that reduces the volume of a crossbow bow. The crossbow includes a crossbow body, a crossbow bow provided on the crossbow body, two pulley blocks provided at both ends of the crossbow bow, and a pulley block connected to each pulley block respectively One main string and two pairs of strings. Among them, each pulley group includes a main shaft and a set of shafts One main chord and one pair of chords on the outer peripheral side. By the composition of the above-mentioned components, the angle when each auxiliary string is connected with each pulley block can be adjusted, and the pulling force applied to the pulley block can be reduced.

10: Crossbow

11: trigger

12: Arrow Groove

13: Grooving

20: Crossbow

21: Crossbow wings

22: Arch arm group

212: Slot

222: upper arm

224: Lower Arch Arm

226: Jaw

2222, 2242: Arch arm pivot hole

30: pulley block

31: Spindle

32: bushing

322: Wing

33: Palin

34: Main chord

341: Main chord groove

342: Main chord port

343: main string pivot post

344: Main chord adjustment slot

345: threaded column

3452: Spiral guide groove

346: Vice chord steering column

347: Substring pivot post

348: Main axle hole

35: Vice chord

362, 364, 366: bush

37: C buckle

40: main string

52, 54: Vice string

60: Slider

θ: oblique angle

Figure 1 is a three-dimensional schematic view of a crossbow of the present invention that reduces the volume of a crossbow.

Figure 2 is a partial schematic view of the embodiment shown in Figure 1.

Figure 3 is a schematic diagram of another embodiment of the embodiment shown in Figure 2.

Figure 4 is a schematic diagram of another embodiment of the embodiment shown in Figure 2. .

Figure 5 is a schematic partial cross-sectional view of the embodiment shown in Figure 2.

Figure 6 is an exploded view of the partial components of the embodiment shown in Figure 2.

Figure 7 is an exploded view of the partial components of the embodiment shown in Figure 6.

Figure 8 is a schematic diagram of some components of the embodiment shown in Figure 7.

Figure 9 is a schematic diagram of another embodiment of the embodiment shown in Figure 8.

Figure 10 is a schematic diagram of the implementation shown in Figure 5.

Figure 11 is a schematic diagram of the operation of the embodiment of the present invention (1).

Figure 12 is a partial schematic view of the embodiment shown in Figure 11.

Figure 13 is a schematic diagram of the operation of the embodiment of the present invention (2).

Figure 14 is a schematic diagram of another embodiment of the embodiment shown in Figure 13.

Figure 15 is a schematic diagram of action of the embodiment of the present invention (3).

Figure 16 is a partial schematic view of the embodiment shown in Figure 15.

Figure 17 is a schematic diagram of a conventional crossbow.

Figure 18 is a schematic diagram of the operation of a conventional crossbow (1).

Figure 19 is a schematic diagram of the operation of the conventional crossbow (2).

In the following, please refer to the related drawings to further illustrate the crossbow embodiment of the present invention to reduce the volume of the crossbow. In order to facilitate the understanding of the embodiment of the present invention, the following identical components are marked with the same symbols.

As shown in FIGS. 1 to 9, the crossbow of the present invention which reduces the volume of the crossbow includes a crossbow body 10, a crossbow 20, two pulley blocks 30, a main string 40, and two pairs of strings 52, 54.

For the above-mentioned crossbow body 10, please refer to Figures 1 to 2 (the conventional technique), which has a trigger 11 provided at a predetermined position of the downward facing end face of the crossbow body 10, an arrow slot 12 provided at the top face of the crossbow body 10, A cross-section 13 formed through the crossbow body 10 in a lateral direction.

The aforementioned crossbow 20, as shown in Figs. 1, 2 and 6, is arranged laterally at the front section of the crossbow body 10, and includes a crossbow wing 21 and two bow arm groups 22. The crossbow wings 21 are horizontally arranged at the front end of the crossbow body 10, and have a slot 212 at each end. Each of the bow arm groups 22 is composed of upper and lower bow arms 222 and 224, and the same ends of the upper and lower bow arms 222 and 224 are respectively inserted into the slots 212, and the other end is arranged along the extending direction of the crossbow body 10 , And defines a pinch 226, and upper and lower concentrically formed arch arm pivot holes 2222, 2242. In the implementation, the length of the crossbow body 10 of the crossbow 20 is reduced by the arm group 222, and the overall transverse product of the crossbow is greatly contracted.

The above-mentioned pulley blocks 30, as shown in Figures 5 to 9, include a main shaft 31, a sleeve 32, a plurality of Palin 33, a main chord 34, a pair of chords 35, a plurality of washers 362 (364, 366), And a plurality of C buckles 37; wherein, the main chord 34 of each pulley group 30 has the same structure, but in a left and right mirror configuration.

Both ends of the main shaft 31 are pivotally connected to the arm pivot holes 2222 and 2242 of the upper and lower bow arms 222 and 224, respectively.

The sleeve 32 has a hollow tubular body with an overall outline, and is sleeved on the outer peripheral side of the main shaft 31 to increase the rigidity of the main shaft 31. During implementation, a wing portion 322 extends radially outward from the top of the sleeve 32 to buckle the top of the main chord 34 In addition, the outer peripheral surface of the sleeve 32 and the lower section have a step section with different outer diameters.

Each of the above-mentioned bearings 33 is sleeved on the outer peripheral side of the main shaft 31 and is accommodated in the sleeve 32.

The main chord 34 is disposed on the outer peripheral side of the sleeve 32, and has a main chord groove 341, a main chord port 342, a main chord pivot post 343, a main chord adjustment groove 344, a threaded post 345, A pair of string steering columns 346, a pair of string pivot posts 347 and a main axle hole 348.

The main chord groove 341 is recessed along the radial outer circumferential surface of the main chord 34.

The main chord port 342 is formed with a top and a bottom penetrating the main chord wheel 34 at a predetermined position, and the lateral opening faces the crossbow body 10.

The main string pivot post 343 is formed by the main string wheel 34 extending upward at a predetermined position on the upper end surface, and matches the position of the main string port 342. Compared with the auxiliary string steering column 346, it is adjacent to the front end of the crossbow body 10 and is located At the inner side of the upper and lower arch arms 222, 224 (towards the side of the crossbow body 10).

The main chord adjustment groove 344 is formed in the main chord wheel 34 by being recessed around the main chord pivoting post 343.

The threaded column 345 is formed by the main chord 34 extending downward toward the lower end surface, and its outer peripheral surface has a spiral guide groove 3452 formed by recessing upward and downward, and the entrance of the spiral guide groove 3452 matches the position of the auxiliary chord steering column 346 .

The auxiliary chord steering column 346 and the auxiliary chord pivoting column 347 are respectively formed by the main chord 34 extending downward toward a predetermined position on the lower end surface, different from the main chord pivoting column 343 formed at the other end of the main chord 34 , Adjacent to the radially outer end of the main chord wheel 34, and located on both sides of the extension direction of the upper and lower bow arms 222, 224 respectively (the auxiliary chord steering column 346 is on the outside, and the auxiliary chord pivot column 347 is on the inner side adjacent to the crossbow body 10 side).

The main wheel shaft hole 348 is eccentric and penetrates the main chord wheel 34 from top to bottom It is formed and provides the shaft sleeve 32 to extend and pivotally set the main chord 34 to the jaw 226 of the arm group 22.

The auxiliary chord 35 is sleeved on the outer peripheral side of the sleeve 32 and is arranged on the downward end surface of the screw post 345.

The bushes 362, 364, and 366 are sleeved on the outer peripheral side of the main shaft 31 or the bush 32, respectively, to adjust the main chord 34 and the auxiliary chord 35 to stand upright at the nip 226 of the bow arm group 22.

The above-mentioned C buckles 37 (known techniques) are respectively sleeved on the outer peripheral sides of both ends of the main shaft 31 and are in contact with the arm group 22 to restrain the pulley group 30 on the arm group 22.

The main string 40 (the conventional technique) is connected to the main string pivot column 343 of each main string wheel 34 at the two ends, and the other end passes through the main string port 342 and then follows the main string toward the auxiliary string steering column 346. After the wheel groove 341 wraps around the outer peripheral side of the main chord wheel 34, it crosses over the crossbow body 10 at right angles. In practice, the position of the main string 40 extending through the main string port 342 is matched with the main string wheel slot 341 by matching the main string adjusting groove 344 (to avoid high and low drop).

Each of the auxiliary strings 52 and 54 (the conventional technique) is connected at one end to the auxiliary string pivot post 347 of the preset main string wheel 34, and the other end is turned around the auxiliary string steering column 346 before passing through the threaded column 345 After the spiral guide groove 3452 (entrance end) and the split groove 13 of the crossbow body 10, the end is pivotally connected to the auxiliary chord 35 of another pulley block 30.

The above-mentioned slider 60, as shown in FIG. 2 (the conventional technique), is housed in the crossbow body 10 and separates the contact between the auxiliary strings 52 and 54 and the crossbow body 10.

Please refer to FIG. 10, wherein the total width of the jaws 226 of the arch arm group 22 is set to A, and the distance between the outlet end of the spiral guide groove 3452 of the threaded post 345 and the upper arch arm 222 (bottom end) is set to B , And the distance between the auxiliary chord 35 (minimum outer diameter) and the lower bow arm 224 (top) is set to C, the total width A of the jaw is the auxiliary chord 35 and The distance C between the lower arch 224 and the interval C is preferably 1.7 to 3 times, and the distance B between the outlet end of the spiral guide groove 3452 and the upper arch 222 is less than one-half the total width A of the jaw.

Therefore, the above is an introduction to the components of the crossbow and the assembly method for reducing the volume of the crossbow provided by a preferred embodiment of the present invention. The operating characteristics of the embodiment of the present invention are introduced as follows.

Please refer to the figures 11 to 16, as shown in the normal state, the main string 40 and the auxiliary string 52 (54) exert low tension on each arm group 22, through the structural rigidity of the sleeve 32, the main shaft can be effectively protected 31 needs.

Under normal conditions, as shown in Figures 11 and 12, each auxiliary chord 52, 54 passes through the entrance of the spiral guide groove 3452 of the threaded post 345. As shown in Figures 13 to 16, when the main string 40 is pulled and wound, the main string 34 of each pulley group 30 will be synchronously connected, and the auxiliary strings 52, 54 along the spiral guide groove of the threaded column 345 will be retracted at the same time. 3452 is filled in, and the downward extension of the spiral guide groove 3452 gradually moves each substring 52, 54 into the position of the spiral guide 3452, so that each substring 52, 54 is in each pulley block 30 and crossbow body 10 The angle between them is reduced, which solves the problem of the excessively large angle of the conventional auxiliary strings 52 and 54 and also reduces the problem of the yaw of the main chord 34.

The above descriptions are only preferred embodiments of the present invention, and are intended to clarify the features of the present invention, not to limit the scope of the embodiments of the present invention, and the average changes made by those skilled in the art according to 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.

10: Crossbow

11: trigger

12: Arrow Groove

13: Grooving

20: Crossbow

21: Crossbow wings

22: Arch arm group

222: upper arm

224: Lower Arch Arm

226: Jaw

30: pulley block

40: main string

52, 54: Vice string

Claims (3)

A crossbow that reduces the volume of a crossbow bow. The crossbow includes a crossbow body, a crossbow at the front of the crossbow body, two pulley sets pivoted at both ends of the crossbow respectively, and a main string connecting each of the pulley sets and Two pairs of chords, each of which includes a main shaft, a main chord wheel, a bushing, plural bushes, plural Palins, and a pair of chord wheels; the main shaft is pivotally arranged at the end of the crossbow; the main The chord wheel is arranged on the outer peripheral side of the main shaft, and has a main chord groove formed along the radial outer circumferential surface of the main chord wheel, a side opening facing the crossbow body to form a main chord port of the main chord side end, A main string pivot post formed on the main string wheel matching the position of the main string port, a threaded post extending from the main string wheel toward the lower end surface, and a spiral guide groove on the outer peripheral surface, two formed on the main string The auxiliary chord steering column and auxiliary chord pivoting column of the downward facing end of the main chord wheel, and an eccentric main shaft hole formed through the main chord wheel to provide the extension of the main shaft; the sleeve is attached to the outer peripheral side of the main shaft , The top of which extends radially outwards with a wing, and the outer peripheral surface and the lower section of the bushing have more stepped sections with different outer diameters; each bushing is sleeved on the main shaft and the outer peripheral side of the bushing; The Pei Lin, the sleeve is held on the outer peripheral side of the main shaft and is accommodated in the sleeve; and the auxiliary chord gear is provided on the outer peripheral side of the main shaft and is disposed on the threaded column toward The lower end. A crossbow with a reduced crossbow bow size as described in item 1 of the patent application scope, wherein the crossbow bow includes a crossbow wing and two bow arm groups; the crossbow wing is transverse to the front end of the crossbow body, with a slot at each end; The bow arm group is composed of an upper arm and a lower arm, and the same end is inserted into the slot, and the other end is arranged along the extension direction of the crossbow body, and a jaw is defined to provide matching each The pulley block is accommodated. As described in Item 2 of the scope of the patent application, a crossbow with a reduced crossbow volume, wherein the main chord wheel further has a main chord adjustment groove formed in the main chord wheel recessed around the main chord pivoting post.

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