A compound bow double-main string eccentric wheel stepless bowstring adjusting structure

Abstract

The utility model provides a kind of stepless bowstring adjusting structure of composite bow double main chord eccentric wheel, belong to composite bow technical field.A kind of stepless bowstring adjusting structure of composite bow double main chord eccentric wheel includes telescopic adjusting part;By being provided with telescopic adjusting part on eccentric wheel, and, one end of telescopic adjusting part extends into chord groove on eccentric wheel, telescopic adjusting part makes the movement of extension into chord groove or retraction from chord groove to carry out tightness adjustment to bowstring in chord groove, and, the tightness degree of bowstring can be adapted according to the telescopic length of telescopic adjusting part, prevent the problem of excessive adjustment, better adaptability, more accurate adjustment, and cooperate original chord groove to be adjusted bowstring and carry out lateral limit, without setting any adapter of the shape of adapting bowstring, it can always ensure that the end of telescopic adjusting part is abutted on the axial position of bowstring, prevent the problem of top deviation, ensure the adjustment accuracy, and simple and reliable structure, convenient operation, and lower cost.

Description

Technical Field

[0001] This utility model relates to the field of composite bow technology, specifically to a stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow. Background Technology

[0002] As a sporting instrument, the compound bow can be used for both archery and marbles, catering to the diverse shooting needs of different types of users. Its versatility has made it a favorite among archery enthusiasts.

[0003] A compound bow typically includes a handle, limbs, an eccentric wheel, and a bowstring. For example, patent CN221376442U discloses a dual-purpose compound bow with a handle and limbs. The limbs are located at both ends of the handle, and each limb has a pulley. A bowstring is wound between the two pulleys, and a release device, which is a magnetic base, is attached to the bowstring. In use, an arrow or steel ball is attached to the release device, and then the bowstring is pulled. As the pulley rotates, the limbs deform and store force. Releasing the release device resets the limbs and pulleys, launching the arrow or steel ball. Because the bowstring stretches over time during use, resulting in insufficient tension, it needs to be adjusted to ensure consistent tension on both strands, effectively preventing the arrow or steel ball from deviating during launch. To facilitate the adjustment of the two bowstrings, the industry uses a string-fixing buckle on the eccentric wheel around which the bowstring is wound to hold it in place. For example, patent CN220489839U discloses a string-fixing buckle and a double-string composite bow with a string-fixing buckle. In this case, pulley one and pulley two are respectively equipped with an arc-shaped string point, two button-type string hanging points, and two grooves. The main string is folded in half to form two strings, with the folded part of the main string fitting onto the arc-shaped string point of pulley one. The free ends of the main strings are fixed to the two button-type string hanging points of pulley two. Furthermore, pulley one is equipped with a string-fixing buckle. The buckle's buckle plate is connected to pulley one via a fastening screw. The two string-pressing parts of the buckle plate face the two grooves of pulley one, pressing the two main strings in the grooves tightly against pulley one. When the two bowstrings become inconsistent in length after a period of use, the string-fixing buckle can be loosened to allow the two strings to be pulled, achieving quick adjustment. However, in actual use, because the force on the bowstring is very large when the bow is drawn and the surface of the bowstring is relatively smooth, the string-fixing buckle with the buckle cannot fully press the bowstring. Even during use, the two strands of the bowstring will still twitch slightly, resulting in different tensions on the two strands of the string, and there is still a risk of shooting off course. Therefore, the industry urgently needs a structure that is easy to operate and can finely adjust the bowstring to achieve bowstring adjustment. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this invention aims to provide a stepless bowstring adjustment structure for a compound bow with a double main string eccentric wheel. A telescopic adjustment component is provided on the eccentric wheel, with one end extending into the string groove of the eccentric wheel and abutting against the bowstring within the groove. This allows for adjustment of the bowstring tension by extending the telescopic adjustment component into the groove. The end of the telescopic adjustment component pushes against the bowstring in the groove, thus tightening or loosening the bowstring, meeting the need for rapid bowstring adjustment and making it more convenient to use. Furthermore, by combining adjustment with the original string groove on the eccentric wheel, the bowstring offset during adjustment is limited by the string groove, ensuring that the end of the telescopic adjustment component always abuts against the bowstring's axis, preventing the end of the telescopic adjustment component from pushing against the bowstring or the bowstring from detaching from the end of the telescopic adjustment component. This eliminates the need for an adapter at the end of the telescopic adjustment component to fit the bowstring shape, resulting in a simpler, more reliable, and lower-cost structure.

[0005] The specific technical solution is as follows: A stepless bowstring adjustment structure for a compound bow with a double main string eccentric wheel is provided on the eccentric wheel of the compound bow for adjusting the tension of the bowstring wound in the string groove of the eccentric wheel. It is characterized by including: a telescopic adjustment member, which is installed on the eccentric wheel and located on the side opposite to the opening of the string groove. One end of the telescopic adjustment member extends into the corresponding string groove and abuts against the bowstring in the string groove. The telescopic adjustment member can move into or retract from the string groove.

[0006] The aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel includes a telescopic adjustment component that is a screw, and a threaded adjustment hole that connects to the string groove is provided on the eccentric wheel. The telescopic adjustment component is threadedly installed in the threaded adjustment hole.

[0007] The aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel includes a limit nut on the telescopic adjustment component. The limit nut is threadedly connected to the telescopic adjustment component, and after the telescopic adjustment component is adjusted to the correct position on the eccentric wheel, the limit nut is pressed against the eccentric wheel.

[0008] The aforementioned stepless bowstring adjustment structure for a compound bow with a double main string eccentric wheel further includes a pad, which is disposed on the end face of one end of the telescopic adjustment member extending into the string groove, and the pad abuts against the bowstring in the string groove.

[0009] In the aforementioned stepless bowstring adjustment structure of a composite bow with a double main string eccentric wheel, the pad is made of nylon.

[0010] In the aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel, a recessed hole is provided on the end face of the telescopic adjustment member extending into the string groove, and the end of the pad that is away from the bowstring is embedded into the recessed hole.

[0011] The aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel has a telescopic adjustment component on each string slot of the eccentric wheel.

[0012] In the aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel, the groove edges of the string grooves on the eccentric wheel, located at the location of each telescopic adjustment element, are arranged to protrude outwards to form extensions.

[0013] The aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel includes a reinforcing part on the eccentric wheel at the location where the telescopic adjustment component is installed, and when the telescopic adjustment component is a screw, a threaded adjustment hole is provided on the reinforcing part.

[0014] The aforementioned stepless bowstring adjustment structure of a compound bow with a double main string eccentric wheel includes a viewing window on the eccentric wheel located on the outer side of the string groove. The viewing window is located at the telescopic adjustment member corresponding to the string groove, and the viewing window is arranged along the telescopic direction of the corresponding telescopic adjustment member. An adjustment scale is provided on the edge of the viewing window along the telescopic direction of the corresponding telescopic adjustment member.

[0015] The positive effects of the above technical solution are: The aforementioned stepless bowstring adjustment structure with a double main string eccentric wheel in a compound bow utilizes a telescopic adjustment component on the eccentric wheel. One end of this component extends into the string groove and abuts against the bowstring within that groove. The telescopic movement of this component allows for adjustment of the length of its extension into the groove, enabling the tension of the corresponding string to be tightened or loosened. This adjustment process requires only the operation of the telescopic adjustment component, eliminating the need to manipulate other structures, thus achieving rapid and convenient bowstring adjustment. The extension distance of the telescopic adjustment component can be adjusted to meet different bowstring tension requirements, avoiding problems of excessively loose or tight adjustment. It has better adaptability and higher adjustment accuracy. Furthermore, it makes full use of the original string groove structure on the eccentric wheel. Through the cooperation of the string groove, the bowstring being adjusted is laterally limited, so that the end of the telescopic adjustment component can always abut against the axis of the bowstring, without problems of offset or separation from the bowstring. This allows the end of the telescopic adjustment component to abut against the bowstring directly, eliminating the need for any adapters to match the shape of the bowstring at the end of the telescopic adjustment component. The structure is simpler, more reliable, and lower in cost. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of a stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to the present invention; Figure 2This is a structural diagram of the eccentric wheel of a composite bow double main string eccentric wheel according to a stepless bow string adjustment structure of the present invention; Figure 3 This is a structural diagram of the eccentric wheel of a composite bow double main string eccentric wheel according to another perspective of the present invention; Figure 4 This is a structural diagram of the telescopic adjustment component of a composite bow with a double main string eccentric wheel and a stepless bowstring adjustment structure according to this utility model.

[0017] In the attached diagram: 1. Eccentric wheel; 11. String groove; 12. Threaded adjustment hole; 13. Extension; 14. Reinforcing part; 15. Viewing window; 16. Adjustment scale; 2. Bowstring; 3. Telescopic adjustment component; 31. Limit nut; 4. Pad. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 4 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0019] Figure 1 This is a structural diagram of an embodiment of a stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to the present invention; Figure 2 This is a structural diagram of the eccentric wheel of a composite bow double main string eccentric wheel according to a stepless bow string adjustment structure of the present invention; Figure 3 This is a structural diagram of the eccentric wheel in a continuously variable bowstring adjustment structure with a double main string eccentric wheel for a composite bow, according to this utility model, from another perspective. Figure 1 , Figure 2 as well as Figure 3 As shown in the figure, the stepless bowstring adjustment structure of the compound bow with dual main string eccentric wheel provided in this embodiment is set on the eccentric wheel 1 of the compound bow. It is used to adjust the tension of the bowstring 2 wound in the string groove 11 of the eccentric wheel 1, thereby ensuring that the tension of the two bowstrings 2 is consistent and preventing the problem of shooting deviation. That is, when it is necessary to adjust one side of the bowstring 2, only that string needs to be adjusted, without operating other structures. The adjustment is more intuitive, without complicated operating procedures, without the need for experience, and is more convenient to operate, better meeting the practice needs of novice users.

[0020] Specifically, the stepless bowstring adjustment structure of the compound bow with dual main string eccentric wheel provided in this embodiment includes a telescopic adjustment member 3. The tension of the bowstring 2 is adjusted by the telescopic adjustment member 3 to ensure that the tension of the two bowstrings 2 remains consistent, thus avoiding the problem of shooting deviation. At this time, the telescopic adjustment member 3 is installed on the eccentric wheel 1 and located on the side opposite to the opening of the string groove 11, so that the bowstring 2 in the string groove 11 can be pushed by the telescopic adjustment member 3, so that the distance between the bowstring 2 and the bottom of the string groove 11 can be changed, thereby realizing the adjustment of the tension of the string. Furthermore, one end of the telescopic adjustment member 3 extends into the corresponding string groove 11 and abuts against the bowstring 2 within the string groove 11. The telescopic adjustment member 3 moves into or out of the string groove 11. The length of the end of the telescopic adjustment member 3 extending into the string groove 11 is adjusted through its telescopic movement on the eccentric wheel 1, thereby adjusting the distance it pushes against the bowstring 2, achieving tension or relaxation of the bowstring 2, and thus changing the tension of the two strings. This ensures that the tension of both strings is consistent, preventing arrows or steel balls launched through the two strings from deviating from their intended path, resulting in a more rational structural design. It is worth noting that the arrangement direction of the telescopic adjustment member 3 on the eccentric wheel 1 is non-tangential to the string groove 11 at the point where the telescopic adjustment member 3 extends into the string groove 11. This allows the telescopic adjustment member 3 to be arranged at an angle to the string groove 11, ensuring that the length of the telescopic adjustment member 3 extending into the string groove 11 changes during telescopic movement on the eccentric wheel 1, thus meeting the adjustment requirements of the bowstring 2. In addition, the structure in this embodiment makes full use of the original string groove 11 structure on the eccentric wheel 1. When used with the string groove 11, the bowstring 2 in the string groove can be laterally limited by the groove edge of the string groove 11, preventing the bowstring 2 and the end of the telescopic adjustment member 3 from being misaligned during adjustment and use. This ensures that the end of the telescopic adjustment member 3 can always be in contact with the axis of the bowstring 2 during adjustment, and there will be no problem of top deviation or separation from the bowstring 2, thus ensuring adjustment accuracy. There is no need to set any adapter to match the shape of the bowstring 2 at the end of the telescopic adjustment member 3. The structure is simple, reliable, easy to operate, and lower in cost.

[0021] More specifically, the telescopic adjustment component 3 installed on the eccentric wheel 1 is a screw. A threaded adjustment hole 12, communicating with the chord groove 11, is provided on the eccentric wheel 1. The telescopic adjustment component 3 is threaded into the threaded adjustment hole 12, allowing adjustment of the length of the end of the telescopic adjustment component 3 extending into the chord groove 11 by turning the screw. This provides convenient adjustment and structural stability. Furthermore, fine-tuning can be achieved by adjusting the angle of the screw, adapting to any adjustment stroke and meeting stepless adjustment requirements. This results in better operability, higher adjustment accuracy, and better adaptability. Preferably, the screw is a headless hexagonal socket head cap screw, ensuring that only a small portion of the telescopic adjustment component 3 is exposed after installation on the eccentric wheel 1, achieving structural concealment and improved aesthetics.

[0022] Figure 4 This is a structural diagram of the telescopic adjustment component of a composite bow with a double main string eccentric wheel and a stepless bowstring adjustment structure according to this utility model. Figures 1 to 4 As shown, a limit nut 31 is also provided on the telescopic adjustment member 3. In this case, the limit nut 31 and the telescopic adjustment member 3 are also threadedly connected, so that the limit nut 31 can move on the telescopic adjustment member 3 by its own rotation. In use, after the telescopic adjustment member 3 is adjusted to the correct position on the eccentric wheel 1, the limit nut 31 is tightened against the eccentric wheel 1 by turning it, thereby restricting the telescopic adjustment member 3 and preventing the telescopic adjustment member 3 from rotating accidentally and affecting the adjustment effect. The adjustment is more stable and reliable.

[0023] More specifically, a pad 4 is provided on the end face of the telescopic adjustment member 3 at the end that extends into the string groove 11. The pad 4 abuts against the bowstring 2 in the string groove 11. That is, the telescopic adjustment member 3 contacts the bowstring 2 through the pad 4, which avoids the problem of excessive wear on the bowstring 2 during use and adjustment, extends the service life of the bowstring 2, and makes the structural design more reasonable.

[0024] More specifically, the pad 4 on the telescopic adjustment component 3 used for transferring and pushing the bowstring 2 is made of nylon. Due to its low coefficient of friction, it significantly reduces wear on the bowstring 2 and extends its service life. Furthermore, the nylon pad 4 has good wear resistance, resulting in a longer service life and better maintaining adjustment accuracy, preventing excessive wear of the pad 4 itself that could reduce adjustment accuracy.

[0025] More specifically, an embedding hole is provided on the end face of the telescopic adjustment member 3 extending into the string groove 11. Furthermore, the end of the pad 4 facing away from the bowstring 2 is embedded into the embedding hole, realizing the embedded installation of the pad 4 on the telescopic adjustment member 3. This allows the pad 4 and the telescopic adjustment member 3 to form an integral structure, preventing problems such as offset or slippage, facilitating installation and adjustment, and making the structural design more reasonable.

[0026] More specifically, each eccentric wheel 1 has a corresponding telescopic adjustment element 3 located in each string groove 11. This allows for quick adjustment of any deviation in the tension of either string within the two string grooves 11 using the corresponding telescopic adjustment element 3. If the firing direction shifts to one side, it indicates that the tension of the string on that side is too low. In this case, adjusting the telescopic adjustment element 3 on that side will push the string forward, making it taut and adjusting it to match the tension of the other string. This eliminates the need for a complex adjustment process, making the adjustment more intuitive and easier to operate. This allows beginners to quickly get started, which is beneficial for product promotion.

[0027] More specifically, the groove edges of the string groove 11 on the eccentric wheel 1, located at the location of each telescopic adjustment member 3, are arranged to protrude outward to form an extension 13. The extension 13 provides a longer limiting distance at the location of the string groove 11 corresponding to the telescopic adjustment member 3, so that even if the bowstring 2 in the string groove 11 is pushed outward by the telescopic adjustment member 3 to a certain distance, there are still corresponding extensions 13 on both sides of the bowstring 2 to limit its sides, preventing the bowstring 2 from coming out of the string groove 11 at that location and maintaining the stability of the bowstring 2 wound on the eccentric wheel 1.

[0028] More specifically, a reinforcing part 14 is provided on the eccentric wheel 1 at the location where the telescopic adjustment component 3 is installed. Furthermore, the reinforcing part 14 and the eccentric wheel 1 are an integral structure, resulting in better overall integrity and higher structural strength. When the telescopic adjustment component 3 is a screw, the threaded adjustment hole 12 is located on the reinforcing part 14. This increases the structural strength of the location on the eccentric wheel 1 where the telescopic adjustment component 3 is installed, making the installation of the telescopic adjustment component 3 more stable and reliable, and also facilitating the maintenance of the bowstring 2's adjusted state.

[0029] More specifically, a viewing window 15 is provided on the outer wall of the eccentric wheel 1, located on the outside of the string groove 11. This viewing window 15 is positioned at the corresponding telescopic adjustment member 3 within the string groove 11, allowing the user to observe the adjustment amount more directly when using the telescopic adjustment member 3 to adjust the tension of the bowstring 2 within the string groove 11. This facilitates easier adjustment. Furthermore, the viewing window 15 is arranged along the telescopic direction of the corresponding telescopic adjustment member 3, adapting to its travel. Simultaneously, an adjustment scale 16 is provided on the edge of the viewing window 15 along the telescopic direction of the corresponding telescopic adjustment member 3. This allows the user to visually determine the adjustment amount by comparing the position of the end of the telescopic adjustment member 3 inserted into the string groove 11 with the adjustment scale 16, making adjustment more convenient and easier for beginners to quickly master.

[0030] The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel provided in this embodiment includes a telescopic adjustment member 3. By providing the telescopic adjustment member 3 on the eccentric wheel 1, and having one end of the telescopic adjustment member 3 extend into the string groove 11 on the eccentric wheel 1, the telescopic adjustment member 3 can move into or retract from the string groove 11. This allows the user to adjust the length of the telescopic adjustment member 3 extending into the string groove 11, thereby adjusting the pushing stroke of the telescopic adjustment member 3 on the bowstring 2 within the string groove 11. This enables the adjustment of the tension of the bowstring 2 within the string groove 11, satisfying the need for adjusting the bowstring 2 tension. To meet the usage requirements, only the telescopic adjustment component 3 needs to be adjusted, without the need to adjust other structures. The adjustment is more intuitive and faster. Furthermore, the tension of the bowstring 2 can be adapted according to the telescopic length of the telescopic adjustment component 3, preventing over-adjustment. It has better adaptability and more precise adjustment. In addition, it works with the original string groove 11 to laterally limit the bowstring 2 being adjusted. Without the need to set any adapters to match the shape of the bowstring 2, it can always ensure that the end of the telescopic adjustment component 3 abuts against the axis of the bowstring 2, preventing top deviation and further ensuring adjustment accuracy. Moreover, the structure is simple and reliable, easy to operate, and lower in cost.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stepless bowstring adjustment structure for a compound bow with a double main string eccentric wheel, disposed on the eccentric wheel of the compound bow, for adjusting the tension of the bowstring wound in the string groove of the eccentric wheel, characterized in that, include: A telescopic adjustment member is mounted on the eccentric wheel and located on the side opposite to the opening of the string groove. One end of the telescopic adjustment member extends into the corresponding string groove and abuts against the bowstring inside the string groove. The telescopic adjustment member can move into or retract from the string groove.

2. The stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to claim 1, characterized in that, The telescopic adjustment component is a screw, and the eccentric wheel has a threaded adjustment hole that connects to the chord groove. The telescopic adjustment component is threadedly installed in the threaded adjustment hole.

3. The stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to claim 2, characterized in that, The telescopic adjustment component is also provided with a limit nut, which is threadedly connected to the telescopic adjustment component. After the telescopic adjustment component is adjusted to the position on the eccentric wheel, the limit nut is pressed against the eccentric wheel.

4. The stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to claim 1, characterized in that, It also includes a pad, which is disposed on the end face of one end of the telescopic adjustment member that extends into the string groove, and the pad abuts against the bowstring in the string groove.

5. The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel according to claim 4, characterized in that, The pad is made of nylon.

6. The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel according to claim 4 or 5, characterized in that, The end face of the telescopic adjustment member extending into the string groove has an insert hole, and the end of the pad that is opposite to the bowstring is inserted into the insert hole.

7. The stepless bowstring adjustment structure with a double main string eccentric wheel for a composite bow according to claim 1, characterized in that, Each of the eccentric wheels has a corresponding telescopic adjustment member on each of the chord grooves.

8. The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel according to claim 1, characterized in that, The groove edges of the chord grooves on the eccentric wheel and at the location of each of the telescopic adjustment members are arranged to protrude outward to form an extension.

9. The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel according to claim 2, characterized in that, A reinforcing part is provided on the eccentric wheel at the location where the telescopic adjustment component is installed, and when the telescopic adjustment component is a screw, the threaded adjustment hole is provided on the reinforcing part.

10. The stepless bowstring adjustment structure of the compound bow with double main string eccentric wheel according to claim 1, characterized in that, A viewing window is provided on the groove wall of the eccentric wheel located on the outer side of the chord groove. The viewing window is located at the telescopic adjustment member corresponding to the chord groove. The viewing window is arranged along the telescopic direction of the corresponding telescopic adjustment member. At the same time, an adjustment scale is provided on the edge of the viewing window along the telescopic direction of the corresponding telescopic adjustment member.

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