A latch structure for fitness equipment

Abstract

The application relates to the technical field of fitness equipment accessories, and provides a bolt structure matched with fitness equipment, which comprises a bushing embedded in a pin hole of an equipment body and a bolt rod inserted into a hole of the bushing, the bolt rod performs axial linear reciprocating motion in the hole of the bushing, and is used for being inserted into or separated from an adjusting hole position of the equipment body; the bolt rod comprises a plug-in end and a connecting end, the connecting end extends out of the bushing and is connected with a knob, an inner wall of a hole of the knob is in clearance fit with an outer side wall of the bushing, the connecting end is provided with a first connecting structure, the bushing is provided with a second connecting structure, the bolt rod is axially movable or fixedly connected relative to the bushing through connection of the first connecting structure and the second connecting structure, the knob is rotated to drive the bolt rod to axially displace relative to the bushing, so that when the plug-in end is inserted into the adjusting hole position, the plug-in end applies continuous axial compression force to the adjusting hole position, and assembly clearance between the bolt rod and the adjusting hole position is eliminated.

Description

Technical Field

[0001] This application relates to the technical field of fitness equipment accessories, and more particularly to a pin structure for use with fitness equipment. Background Technology

[0002] With the rapid development of the fitness industry, large commercial equipment such as GHD (Glute and Leg Training Platform), leg trainers, and Smith machines have widely adopted "spring pins" as the telescopic adjustment mechanism for the column / arm. The standard structure consists of a row of positioning through holes in the main tube wall, into which a cylindrical pin with a spring return mechanism is inserted. Insertion or disengagement is achieved by pulling or rotating a knob, thereby changing the hole position to achieve height or angle adjustment.

[0003] However, this solution has revealed the following common problems during years of large-scale commercial use, which have become pain points in the industry:

[0004] 1. The structural gap cannot be eliminated. A fitting gap must be reserved between the pin and the tube wall and the toothed plate hole. When the direction of the training load changes continuously, the pin will produce a slight impact in the hole, resulting in obvious shaking and abnormal metal noise. This leads to a poor user experience and is prone to metal fatigue.

[0005] 2. Insufficient clamping force - The spring only provides axial restoring force and cannot generate radial clamping. The positioning tooth plate (or rack) is in a "micro-slippage-impact" state for a long time under impact load, which aggravates tooth surface wear and eventually leads to positioning loosening, tooth skipping or even failure, and shortens the equipment maintenance cycle.

[0006] 3. Faulty knob design – Existing knobs require a counter-clockwise rotation to unlock, but during frequent pulling, operators may over-rotate, causing the threads connecting the knob and pin to loosen, and the pin to fall off, resulting in the equipment being momentarily unlocked and posing a risk of personal injury. Utility Model Content

[0007] In view of the above practical problems and the shortcomings of the existing technology, the main technical problem to be solved by this utility model is to provide a pin structure for fitness equipment, which is an adjustment mechanism with "zero gap, wear resistance and anti-loosening".

[0008] To solve the above-mentioned technical problems, this application provides a pin structure for use with fitness equipment, adopting the following technical solution:

[0009] A pin structure for use with fitness equipment includes a bushing embedded in a pin hole in the equipment body and a pin rod inserted into the inner hole of the bushing. The pin rod performs axial linear reciprocating motion in the inner hole of the bushing to insert into or disengage from the adjustment hole of the equipment body.

[0010] The pin includes a plug end and a connecting end. The plug end can extend or retract from the bushing to insert into or disengage from the adjustment hole. The connecting end extends out of the bushing and is connected to a knob, which is fitted around the outer periphery of the bushing.

[0011] The inner wall of the knob hole and the outer wall of the bushing are clearance fit. The connecting end is provided with a first connecting structure. The bushing is provided with a second connecting structure on the inner wall of the hole at one end of the connecting end. The pin rod can move axially or be fixedly connected to the bushing through the connection between the first connecting structure and the second connecting structure.

[0012] The first and second connecting structures convert the rotational motion of the knob into an axial displacement of the pin relative to the bushing when the knob is rotated. When the plug end is inserted into the adjustment hole, the axial displacement causes the plug end to apply a continuous axial clamping force to the adjustment hole to eliminate the assembly gap between the pin and the adjustment hole.

[0013] In a preferred embodiment, a limiting structure is provided between the knob and the pin rod. When the knob rotates relative to the bushing to drive the plug end out of the adjustment hole, the limiting structure prevents the knob from disengaging along the pin rod axially.

[0014] In a preferred embodiment, the connecting end extends outward from the end of the first connecting structure and is provided with an axial boss, the knob is provided with a through hole at the center axial position, and the axial boss is provided with an internal thread hole at the axial center.

[0015] The axial boss is inserted into the through hole and is axially locked by screwing it into the inner bolt hole with a bolt. The knob is fixed on the axial boss so that the knob and the pin rod rotate synchronously.

[0016] The axial boss and the through hole are connected by bolts to form the limiting structure, which is used to prevent the knob from disengaging along the axial direction of the pin.

[0017] In a preferred embodiment, when the knob is rotated to a preset release position, the first connecting structure is disconnected from the second connecting structure, thereby breaking the axial transmission relationship between the knob and the pin rod. Through the clearance fit between the knob and the bushing, the knob is in an idle state.

[0018] In a preferred embodiment, the first connecting structure and the second connecting structure are threaded connection structures.

[0019] In a preferred embodiment, the pin rod is provided with a boss radially outward, the boss being located near the insertion end; a compression spring is fitted onto the pin rod, the two end faces of the compression spring respectively abutting against the boss and the end face of the bushing inner hole.

[0020] In summary, this application has the following beneficial effects:

[0021] 1. Integrated Functional Design: The pin structure has both positioning and locking functions as well as axial clamping. The pin can be locked onto the bushing by simply turning the knob. Its insertion end applies a continuous axial clamping force to the adjustment hole, eliminating the assembly gap between the pin and the adjustment hole, achieving zero-gap fastening between components, significantly improving adjustment accuracy and operational stability, and avoiding the shaking and abnormal noise problems caused by the fit gap in traditional structures.

[0022] 2. Anti-dislodgement safety mechanism: During the counterclockwise loosening process, the connection structure between the knob and the pin is designed to form a fixed connection to prevent axial dislodgement. This ensures that even after the pin is completely axially disengaged from the bushing, the knob remains connected to the pin, eliminating the risk of the knob falling off due to misoperation or vibration and improving safety.

[0023] 3. Integrated structure: The clamping mechanism, anti-drop mechanism and spring pin are integrated through integral molding or modular design to achieve functional synergy, simplified assembly and compact structure, reduce the number of parts and failure points, enhance system reliability, reduce maintenance costs, and are suitable for high-frequency and heavy-load fitness equipment application scenarios. Attached Figure Description

[0024] Figure 1 This is an exploded view of the overall structure of the pin structure in this embodiment;

[0025] Figure 2 This is a schematic diagram of the overall structure of the pin structure in this embodiment;

[0026] Figure 3 This is a diagram showing the state in which the pin structure can slide axially relative to the bushing in this embodiment;

[0027] Figure 4 This is a diagram showing the state of the knob being pulled outwards and the pin retracting into the bushing in this embodiment;

[0028] Figure 5 This is a diagram showing the fixed connection between the pin structure and the bushing in this embodiment.

[0029] Explanation of reference numerals in the attached drawings: 1. Bushing; 11. Second connecting structure; 2. Pin; 21. Insertion end; 22. Connecting end; 23. First connecting structure; 24. Boss; 25. Axial boss; 3. Knob; 31. Through hole; 32. Washer; 4. Compression spring; 5. Fastening bolt. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0034] This embodiment provides a pin structure for use with fitness equipment, including...

[0035] Bushing 1 is embedded in the pin hole of the fitness equipment body to reduce friction and wear between the pin rod 2 and the equipment body.

[0036] The pin 2 passes through the inner hole of the bushing 1 and can reciprocate linearly along the axis within the bushing 1. It is used to insert into or disengage from the adjustment hole on the device body to lock or release the position.

[0037] The pin 2 includes an integrally formed insertion end 21 and a connecting end 22: the insertion end 21 is located at the end of the pin 2 facing the equipment body, is adapted to the adjustment hole, and can extend or retract from the bushing 1 with axial movement to achieve mechanical engagement or disengagement with the adjustment hole; the connecting end 22 is located at the end of the pin 2 away from the equipment body, extends out of the bushing 1, and is connected to a knob 3;

[0038] The knob 3 is sleeved on the outer periphery of the bushing 1, and its inner wall forms an axial guide clearance fit with the outer wall of the bushing 1 (e.g., Figure 3 This allows the knob 3 to rotate freely relative to the bushing 1, meaning the knob 3 can rotate freely, but it cannot be dislodged axially due to the design of the connection structure with the pin 2.

[0039] The outer surface of the connecting end 22 is provided with a first connecting structure 23, and the inner wall of the bushing 1 corresponding to one end of the connecting end 22 is provided with a second connecting structure 11. The first connecting structure 23 and the second connecting structure 11 cooperate with each other, so that the pin 2 and the bushing 1 have two states in the axial direction:

[0040] Axial movement state: When the first connecting structure 23 and the second connecting structure 11 are in a non-engaged or disengaged state, that is, when the knob 3 is rotated to the preset release position, the first connecting structure 23 and the second connecting structure 11 are disconnected, the axial transmission relationship between the knob 3 and the pin 2 is broken, and the pin 2 can move freely axially relative to the bushing 1 (e.g., Figure 3 In this state, the pin 2 can be pulled outward by knob 3 to retract it into bushing 1, thereby disengaging it from the adjustment hole position (e.g. Figure 4 ).

[0041] Fixed connection state: When the first connecting structure 23 and the second connecting structure 11 are engaged or locked, the pin 2 and the bushing 1 form a rigid connection. The rotation of the knob 3 can be directly transmitted to the pin 2, driving its overall axial movement, realizing the self-locking or self-loosening function (e.g., Figure 5 In the self-locking state, the insertion end 21 applies a continuous axial clamping force to the adjustment hole to eliminate the assembly gap between the pin rod 2 and the adjustment hole.

[0042] Specifically, the first connecting structure 23 and the second connecting structure 11 are threaded connection structures. The first connecting structure 23 has an external thread on the outer wall of the connecting end 22, and the second connecting structure 11 has a corresponding internal thread on the inner wall of the bushing 1. The two achieve axial locking and releasing through relative rotation.

[0043] like Figure 1The pin 2 has a protrusion 24 arranged radially outward, and the protrusion 24 is located near the insertion end 21; a compression spring 4 is fitted on the pin 2, and the two end faces of the compression spring 4 abut against the protrusion 24 and the end face of the inner hole of the bushing 1, respectively (e.g., Figure 3 The automatic reset of the pin 2 is achieved by setting a compression spring 4, which provides an automatic return force when the knob 3 is released, so that the insertion end 21 of the pin 2 is kept in the preset locking position, which facilitates the rotation and self-locking of the knob 3, and improves the safety and convenience of operation.

[0044] This solution uses the rotation of knob 3 to drive the axial movement of the pin rod 2, achieving an integrated operation of "locking with one turn and releasing with one turn", realizing zero-gap fastening between components; at the same time, through the wear-resistant bushing 1, the limit of knob 3, and the spring return triple design, the service life, operational safety and user experience are significantly improved, making it suitable for commercial fitness equipment used in high-intensity and high-frequency applications.

[0045] In this embodiment, the fixed connection structure of the knob 3 is specifically as follows: the connecting end 22 extends outward from the end of the first connecting structure 23 to form an axial boss 25, and the axial boss 25 is used to connect the knob 3.

[0046] The axial boss 25 has an internally threaded hole at its axial center for connection and engagement with the knob 3; the knob 3 has a through hole 31 at its central axial position (e.g., Figure 2 The inner diameter of the through hole 31 is adapted to the outer diameter of the axial boss 25, allowing the axial boss 25 to pass through and be inserted into the through hole 31. A fastening bolt 5 passes through the through hole of the knob 3 and engages with the internal threaded hole on the axial boss 25, thereby axially limiting and fixing the knob 3 to the axial boss 25 (e.g., Figure 4 This ensures that the knob 3 and the pin 2 rotate synchronously and cannot be separated axially.

[0047] A washer 32 is provided between the head of the fastening bolt 5 and the end face of the knob 3 (e.g., Figure 1 The axial boss 25 is used to distribute compressive stress and prevent the knob 3 material from deforming or cracking due to localized pressure. The outer surface of the axial boss 25 is a smooth cylindrical surface, forming a low-friction guiding fit with the inner wall of the knob 3's through hole 31, ensuring smooth and unobstructed rotation of the knob 3. This solution achieves a reliable rigid connection between the knob 3 and the pin 2 by setting an axial boss 25 with an internally threaded hole at the connecting end 22 of the pin 2 and using bolts to axially lock the knob 3 onto it. Simultaneously, this structure allows the knob 3 to rotate freely while axially fixed, accurately transmitting torque, significantly improving operational stability and service life, and is particularly suitable for fitness equipment requiring frequent adjustments and high safety standards.

[0048] The above description is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model by those skilled in the art within the scope of the technology disclosed in the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A pin structure for use with fitness equipment, characterized in that: It includes a bushing embedded in the pin hole of the equipment body and a pin rod inserted into the inner hole of the bushing. The pin rod makes axial linear reciprocating motion in the inner hole of the bushing to insert into or disengage from the adjustment hole of the equipment body. The pin includes a plug end and a connecting end. The plug end can extend or retract from the bushing to insert into or disengage from the adjustment hole. The connecting end extends out of the bushing and is connected to a knob, which is fitted around the outer periphery of the bushing. The inner wall of the knob hole and the outer wall of the bushing are clearance fit. The connecting end is provided with a first connecting structure. The bushing is provided with a second connecting structure on the inner wall of the hole at one end of the connecting end. The pin rod can move axially or be fixedly connected to the bushing through the connection between the first connecting structure and the second connecting structure. The first and second connecting structures convert the rotational motion of the knob into an axial displacement of the pin relative to the bushing when the knob is rotated. When the plug end is inserted into the adjustment hole, the axial displacement causes the plug end to apply a continuous axial clamping force to the adjustment hole to eliminate the assembly gap between the pin and the adjustment hole.

2. The pin structure for use with fitness equipment according to claim 1, characterized in that: A limiting structure is provided between the knob and the pin rod. When the knob rotates relative to the bushing to drive the plug end to disengage from the adjustment hole, the limiting structure prevents the knob from disengaging along the pin rod axially.

3. The pin structure for use with fitness equipment according to claim 2, characterized in that: The connecting end extends outward from the end of the first connecting structure and is provided with an axial boss. The knob is provided with a through hole at the center axial position, and the axial boss is provided with an internal thread hole at the axial center. The axial boss is inserted into the through hole and is axially locked by screwing it into the inner bolt hole with a bolt. The knob is fixed on the axial boss so that the knob and the pin rod rotate synchronously. The axial boss and the through hole are connected by bolts to form the limiting structure, which is used to prevent the knob from disengaging along the axial direction of the pin.

4. A pin structure for use with fitness equipment according to any one of claims 1-3, characterized in that: When the knob is rotated to the preset release position, the first connecting structure is disconnected from the second connecting structure, thereby breaking the axial transmission relationship between the knob and the pin rod. Through the clearance fit between the knob and the bushing, the knob is in an idle state.

5. The pin structure for use with fitness equipment according to claim 4, characterized in that: The first connection structure and the second connection structure are threaded connection structures.

6. The pin structure for use with fitness equipment according to claim 1, characterized in that: The pin rod has a boss arranged radially outward, and the boss is located near the insertion end; a compression spring is fitted on the pin rod, and the two ends of the compression spring abut against the boss and the end face of the inner hole of the bushing, respectively.

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