Multi-rotation-amount double-main-chord composite bow pulley

Abstract

The utility model discloses a multi-rotation-amount double-main-chord composite bow pulley which comprises two pulley blocks, two auxiliary chords, two main chords and a bow frame. Wherein the pulley block is composed of a wheel shaft, an auxiliary wheel, a balance wheel, two symmetrically-distributed main wheels and a connecting piece between the two main wheels, the sides, away from each other, of the two main wheels are both connected with the auxiliary wheel and the balance wheel, and the wheel shaft penetrates through the main wheels, the auxiliary wheel and the balance wheel and is rotationally connected with the main wheels, the auxiliary wheel and the balance wheel. According to the multi-rotation-amount double-main-chord composite bow pulley, the two pulley blocks are reversely installed, so that the main chord is located in front of the wheel shaft when a bow is not pulled, the rotation direction of the pulley blocks is opposite to that of the prior art when the pulley blocks work, and the pulling distance of the diameter of one pulley block can be increased under the condition of the pulley blocks with the same size; or a smaller and lighter pulley block is adopted under the condition that the same pulling distance is needed, so that the cost is saved, and the speed of the bow and the arrow is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of compound bows, and particularly relates to a multi-rotation double-main-string compound bow pulley. Background Technique

[0002] The existing dual-purpose compound bows adopt a pulley group with double main strings. Since the loops of the main strings on the pulleys are all in one plane, and in order to ensure shooting accuracy, the soft bowstrings cannot overlap and wind around, the rotation amount of the pulleys of the dual-purpose compound bows is small, and the length of the bowstring that the pulley can release must be less than the circumference of the pulley. For the convenience of people's bow-drawing and aiming operations, the dual-purpose compound bow needs to have a sufficient and appropriate draw length (generally 65 - 85 cm according to different arm spans). For the convenience of carrying and using the dual-purpose compound bow in a narrow space (such as in a car), people need a smaller-sized dual-purpose compound bow. In order to ensure a sufficient draw length, when reducing the axle distance size of the compound bow, a pulley group with a sufficiently large size is required. The pulley diameter of the existing short-axle dual-purpose compound bows even reaches 15 cm, and just the two pulley groups occupy a large proportion of the whole bow length.

[0003] Due to the problem of the rotation direction of the existing compound bow pulley group, the draw length of the bowstring is small, which increases the cost and reduces the speed of the bow and arrow. Content of the Utility Model

[0004] The purpose of the utility model is to provide a multi-rotation double-main-string compound bow pulley to solve the technical problems raised in the background technique.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows: A multi-rotation double-main-string compound bow pulley includes two pulley groups, two auxiliary strings, two main strings and a bow frame; wherein, the pulley group is composed of a wheel axle, an auxiliary wheel, a balance wheel, two symmetrically distributed main wheels and a connecting piece between the two main wheels. On both sides where the two main wheels are away from each other, each is connected to an auxiliary wheel and a balance wheel, and the wheel axle penetrates through the main wheel, the auxiliary wheel and the balance wheel and is rotationally connected to the main wheel, the auxiliary wheel and the balance wheel; the two main strings are respectively wound and connected to the main wheels on the two pulley groups, and the two auxiliary strings are respectively wound around the auxiliary wheel and the balance wheel.

[0006] Preferably, spiral main wheel string grooves, auxiliary wheel string grooves and balance wheel string grooves are provided at the edges of the main wheel, the auxiliary wheel and the balance wheel, and the main wheel string grooves, the auxiliary wheel string grooves and the balance wheel string grooves are spirally wound around each other.

[0007] Preferably, main string button - type string - hanging points are provided on the surfaces of the opposite sides of the two main wheels. Sub - string button - type string - hanging points are provided on the surfaces of the opposite sides of the sub - wheel and the balance wheel away from each other. The two ends of the main string are respectively connected to the main string button - type string - hanging points of the corresponding main wheels on the two pulley sets. The two ends of the sub - string are respectively connected to the sub - string button - type string - hanging points of the corresponding sub - wheel and balance wheel.

[0008] Preferably, a magnetic seat is provided at the middle part between the two main strings.

[0009] Preferably, the bow frame is composed of two oppositely - distributed bow bodies and four bow pieces distributed at both ends of the bow bodies. And the two ends of the two bow bodies are fixedly connected by a connecting block.

[0010] Preferably, a string - hanging ring is provided at one end of the sub - string away from the sub - wheel. Two button - type string - hanging points are provided on the surface of the bow body. The string - hanging ring is connected to the corresponding button - type string - hanging point.

[0011] A multi - rotation - amount double - main - string compound bow pulley of the present utility model has the following advantages:

[0012] For this multi - rotation - amount double - main - string compound bow pulley, by installing the two pulley sets reversely, when the bow is not drawn, the main string is located in front of the axle center. When the pulley set works, the rotation direction is opposite to that of the prior art. It can increase the draw distance of the diameter of a pulley set under the condition of the same - size pulley set, or use a smaller and lighter pulley set under the condition of the required same draw distance, which is beneficial to cost saving and improving the speed of the bow and arrow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0015] Figure 2 It is a schematic structural diagram when stretched in Embodiment 1;

[0016] Figure 3 It is a connection diagram of the main string and the main wheel in Embodiment 1;

[0017] Figure 4 It is a schematic structural diagram of the sub - string button - type string - hanging point in Embodiment 1;

[0018] Figure 5Schematic diagram of the main string snap - type string - hanging point in Embodiment 1;

[0019] Figure 6 Schematic diagram of Embodiment 2;

[0020] Explanation of the markings in the figure: 1. Bow body; 2. Bow limb; 3. Pulley block; 4. Main string; 5. Auxiliary string; 6. Magnetic seat; 7. Main wheel; 8. Auxiliary wheel; 9. Axle; 10. Connector; 11. Auxiliary string snap - type string - hanging point; 12. Main string snap - type string - hanging point; 13. Balance wheel. Detailed implementation manners

[0021] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are regarded as being exemplary in nature rather than restrictive.

[0022] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "length", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the embodiments of the present invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0025] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present utility model. To simplify the disclosure of the embodiments of the present utility model, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0026] In order to better understand the purpose, structure and function of the present utility model, the following further describes in detail a multi-rotation double-main-string compound bow pulley of the present utility model with reference to the drawings.

[0027] Embodiment 1

[0028] As Figures 1-5As shown in the figure, a multi-rotation double-main-string compound bow pulley according to Embodiment 1 of the present invention includes two pulley groups 3, two auxiliary strings 5, two main strings 4 and a bow frame; wherein, the pulley group 3 is composed of a wheel axle 9, an auxiliary wheel 8, a balance wheel 13, two symmetrically distributed main wheels 7 and a connecting member 10 between the two main wheels 7. Both sides of the two main wheels 7 away from each other are connected to an auxiliary wheel 8 and a balance wheel 13, and the wheel axle 9 passes through the main wheel 7, the auxiliary wheel 8 and the balance wheel 13 and is rotatably connected to the main wheel 7, the auxiliary wheel 8 and the balance wheel 13; the two main strings 4 are respectively wound and connected to the main wheels 7 on the two pulley groups 3, and the two auxiliary strings 5 are respectively wound around the auxiliary wheel 8 and the balance wheel 13. Spiral main wheel string grooves, auxiliary wheel string grooves and balance wheel string grooves are provided at the edges of the main wheel 7, the auxiliary wheel 8 and the balance wheel 13, and the main wheel string grooves, the auxiliary wheel string grooves and the balance wheel string grooves are spirally wound around each other. Button-type string hanging points 12 for the main string are provided on the surfaces of the two opposite sides of the two main wheels 7, and button-type string hanging points 11 for the auxiliary string are provided on the surfaces of the auxiliary wheel 8 and the balance wheel 13 away from each other. The two ends of the main string 4 are respectively connected to the button-type string hanging points 12 of the corresponding main wheels 7 on the two pulley groups 3, and the two ends of the auxiliary string 5 are respectively connected to the button-type string hanging points 11 of the corresponding auxiliary wheel 8 and balance wheel 13. A magnetic seat 6 is provided at the middle part between the two main strings 4. The bow frame is composed of two oppositely distributed bow bodies 1 and four bow pieces 2 distributed at both ends of the bow body 1, and the two ends of the two bow bodies 1 are fixedly connected by a connecting block. By installing the two pulley groups 3 reversely, the main string 4 is located in front of the wheel axle 9 when the bow is not drawn, and the rotation direction of the pulley group 3 during operation is opposite to that of the prior art. It is possible to increase the draw distance of the diameter of a pulley group 3 under the condition of the same size pulley group 3, or to use a smaller and lighter pulley group 3 under the condition of the same required draw distance, which is beneficial to cost saving and improving the speed of the bow and arrow. By pulling the magnetic seat 6, the magnetic seat 6 pulls the main string 4, and the main string 4 is released from the string groove of the main wheel 7 to pull the main wheel 7 to rotate. The main wheel 7 drives the auxiliary wheel 8 to rotate, and the auxiliary wheel 8 tightens the auxiliary string 5 and winds it in the string groove. The shortening of the auxiliary string 5 pulls the bow piece 2 to bend, and the bow piece 2 stores elastic potential energy.

[0029] Embodiment 2

[0030] As Figure 6As shown in the figure, a multi-rotation double main-string compound bow pulley according to Embodiment 2 of the present invention includes two pulley groups 3, two auxiliary strings 5, two main strings 4 and a bow frame; wherein, the pulley group 3 is composed of an axle 9, two auxiliary wheels 8, two symmetrically distributed main wheels 7 and a connecting member 10 between the two main wheels 7. One side of the two main wheels 7 away from each other is connected to an auxiliary wheel 8, and the axle 9 penetrates through the main wheel 7 and the auxiliary wheel 8 and is rotationally connected to the main wheel 7 and the auxiliary wheel 8; the two main strings 4 are respectively wound and connected to the main wheels 7 on the two pulley groups 3, and the two auxiliary strings 5 are respectively wound around the auxiliary wheels 8. Spiral main wheel string grooves and auxiliary wheel string grooves are provided at the edges of the main wheel 7 and the auxiliary wheel 8, and the main wheel string grooves and the auxiliary wheel string grooves are spirally surrounded. Button-type string hanging points 12 for the main string are provided on the surfaces of the two opposite sides of the two main wheels 7, and button-type string hanging points 11 for the auxiliary string are provided on the surfaces of the two opposite sides of the two auxiliary wheels 8 away from each other. The two ends of the main string 4 are respectively connected to the button-type string hanging points 12 of the corresponding main wheels 7 on the two pulley groups 3, and the two ends of the auxiliary string 5 are respectively connected to the button-type string hanging points 11 of the corresponding auxiliary wheels 8. A magnetic seat 6 is provided in the middle part between the two main strings 4. The bow frame is composed of two oppositely distributed bow bodies 1 and four bow pieces 2 distributed at both ends of the bow body 1, and the two ends of the two bow bodies 1 are fixedly connected by a connecting block. A string hanging ring is provided at one end of the auxiliary string 5 away from the auxiliary wheel 8, and two button-type string hanging points are provided on the surface of the bow body 1. The string hanging ring is connected to the corresponding button-type string hanging point. By installing the two pulley groups 3 in reverse, the main string 4 is located in front of the axle 9 when the bow is not drawn, and the rotation direction during the operation of the pulley group 3 is opposite to that of the prior art. It is possible to increase the pulling distance of the diameter of one pulley group 3 under the condition of the same-size pulley group 3, or to use a smaller and lighter pulley group 3 under the condition of the required same pulling distance, which is beneficial to cost saving and improving the speed of the bow and arrow. By pulling the magnetic seat 6, the magnetic seat 6 pulls the main string 4, and the main string 4 is released from the string groove of the main wheel 7 to pull the main wheel 7 to rotate. The main wheel 7 drives the auxiliary wheel 8 to rotate, and the auxiliary wheel 8 tightens and winds the auxiliary string 5 in the string groove. The shortening of the auxiliary string 5 pulls the bow piece 2 to bend, and the bow piece 2 stores elastic potential energy.

[0031] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A multi-rotation double-main-string compound bow pulley, characterized in that: It includes two pulley sets (3), two auxiliary strings (5), two main strings (4) and a bow frame; among them, the pulley set (3) is composed of a wheel axle (9), an auxiliary wheel (8), a balance wheel (13), two symmetrically distributed main wheels (7) and a connecting member (10) between the two main wheels (7). On the mutually remote sides of the two main wheels (7), each is connected to an auxiliary wheel (8) and a balance wheel (13), and the wheel axle (9) penetrates through the main wheels (7), the auxiliary wheel (8) and the balance wheel (13) and is rotatably connected to the main wheels (7), the auxiliary wheel (8) and the balance wheel (13); the two main strings (4) are respectively wound and connected to the main wheels (7) on the two pulley sets (3), and the two auxiliary strings (5) are respectively wound around the auxiliary wheel (8) and the balance wheel (13).

2. The multi-rotation quantity double main string composite bow pulley according to claim 1, wherein: Spiral main wheel string grooves, auxiliary wheel string grooves and balance wheel string grooves are provided at the edges of the main wheel (7), the auxiliary wheel (8) and the balance wheel (13), and the main wheel string grooves, the auxiliary wheel string grooves and the balance wheel string grooves are spirally wound around each other.

3. A multi-rotation amount double main string compound bow pulley according to claim 1, characterized in that: Button-type string hanging points (12) for the main string are provided on the surfaces of the mutually opposite sides of the two main wheels (7), button-type string hanging points (11) for the auxiliary string are provided on the surfaces of the mutually remote sides of the auxiliary wheel (8) and the balance wheel (13), the two ends of the main string (4) are respectively connected to the button-type string hanging points (12) of the corresponding main wheels (7) on the two pulley sets (3), and the two ends of the auxiliary string (5) are respectively connected to the button-type string hanging points (11) of the corresponding auxiliary wheel (8) and balance wheel (13).

4. A multi-rotation amount double main string composite bow pulley according to claim 1, characterized in that: A magnetic seat (6) is provided at the middle part between the two main strings (4).

5. A multi-rotation amount double main string composite bow pulley according to claim 1, characterized in that: The bow frame is composed of two relatively distributed bow bodies (1) and four bow pieces (2) distributed at the two ends of the bow body (1), and the two ends of the two bow bodies (1) are fixedly connected by a connecting block.

6. A multi-rotation amount double main chord composite bow pulley according to claim 5, characterized in that: A string hanging ring is provided at the end of the auxiliary string (5) remote from the auxiliary wheel (8), two button-type string hanging points are provided on the surface of the bow body (1), and the string hanging ring is connected to the corresponding button-type string hanging point.

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