Height-adjustable rubber foot pad

Abstract

The utility model discloses an adjustable height rubber foot pad, including leg foot connecting cover and bottom movable foot pad, leg foot connecting cover with bottom movable foot pad is connected with the rotary adjusting lever structure between, the rotary adjusting lever structure both ends are connected in the positive and negative screw thread connection structure that is arranged between leg foot connecting cover with bottom movable foot pad, the relative rotation limit structure is arranged between leg foot connecting cover and bottom movable foot pad, realize the big interval height adjustment under small torque, guarantee the stability of the structure after adjusting, improve the use convenience and adaptability of foot pad.

Description

Technical Field

[0001] This utility model relates to the field of rubber foot pad technology, and in particular to an adjustable height rubber foot pad. Background Technology

[0002] Rubber foot pads are indispensable end accessories in the use of rehabilitation assistive devices such as crutches and walkers, as well as furniture such as tables, chairs, and shelves. They not only provide anti-slip, shock absorption, and noise reduction protection, but also allow for fine-tuning of the overall height of the legs and feet to suit the height needs of different users or the flatness requirements of different ground surfaces.

[0003] Currently, most adjustable height rubber foot pads on the market use a single-thread telescopic rod design for height adjustment. This means that height adjustment is achieved by rotating the foot pad itself or the adjusting rod, utilizing the varying engagement depth of a single thread. However, this type of structure has significant limitations: Firstly, the transmission efficiency of a single-thread adjustment is low. To achieve a larger height adjustment range, a large number of rotations of the adjusting rod are required, making the operation time-consuming and laborious, especially for users of rehabilitation equipment with limited mobility, who may find it difficult to perform the adjustment independently. Secondly, traditional adjustable foot pads lack a reliable relative rotation limiting structure. During adjustment or under stress, circumferential rotation between the foot pad and the leg connection sleeve can easily occur. This not only leads to loosening and displacement of the adjusted height position but also affects the contact stability between the foot pad and the ground, reducing the anti-slip and shock-absorbing protective effect.

[0004] Therefore, there is an urgent need to develop a rubber foot pad that features efficient transmission adjustment, reliable rotation limit, and the ability to adjust height with small torque and large spacing, in order to solve the problems of low adjustment efficiency and insufficient stability in existing technologies.

[0005] Therefore, the existing technology of rubber foot pads needs further improvement. Utility Model Content

[0006] The purpose of this invention is to provide an adjustable height rubber foot pad that enables large-pitch height adjustment under low torque, while ensuring the stability of the structure after adjustment and improving the ease of use and adaptability of the foot pad.

[0007] To achieve the above objectives, the present invention adopts the following solution: An adjustable height rubber foot pad includes a leg connecting sleeve and a bottom movable foot pad. A rotating adjustment rod structure is connected between the leg connecting sleeve and the bottom movable foot pad. The two ends of the rotating adjustment rod structure are connected between the leg connecting sleeve and the bottom movable foot pad and are provided with positive and negative threaded connection structures. A relative rotation limiting structure is provided between the leg connecting sleeve and the bottom movable foot pad.

[0008] Furthermore, the rotating adjustment rod structure includes an intermediate shaft, the lower end of the leg connecting sleeve is provided with a first shaft hole, and the upper end of the bottom movable foot pad is provided with a second shaft hole.

[0009] Furthermore, the positive and negative threaded connection structure includes a positive internal thread provided on the inner wall of the first shaft hole, a negative internal thread provided on the inner wall of the second shaft hole, and positive external threads and negative external threads respectively provided on the outer circumferences of both ends of the intermediate shaft. The positive external threads and the positive internal threads are threaded together, and the negative external threads and the negative internal threads are threaded together.

[0010] Furthermore, the relative rotation limiting structure includes a vertical guide groove disposed on the outer wall of the leg connecting sleeve, and a vertical guide rod disposed on the bottom movable foot pad, the vertical guide rod being movably installed in the vertical guide groove.

[0011] Furthermore, the vertical guide groove and the vertical guide rod are arranged in the same direction as the axial direction of the intermediate shaft.

[0012] Furthermore, an internal hexagon adjustment part is provided at the lower end of the intermediate shaft.

[0013] In summary, the advantages of this utility model over the prior art are: This invention addresses the shortcomings of existing rubber foot pad technology. Through its structural design, it offers the following advantages: The reverse threaded connection structure allows for axial spacing adjustment between the leg connecting sleeve and the bottom movable foot pad at twice the speed of a single thread when the central shaft is rotated. This enables large-scale height adjustments with low torque, significantly improving adjustment efficiency, making it particularly suitable for users with mobility issues or scenarios requiring rapid adjustment. The relative rotation limiting structure restricts circumferential rotation between the leg connecting sleeve and the bottom movable foot pad, ensuring the accuracy of the threaded transmission during adjustment and preventing height position deviation due to force during use, thus enhancing structural stability and reliability. Attached Figure Description

[0014] Figure 1 This is a first-state front view of the present invention; Figure 2 This utility model Figure 1 Sectional view along line AA; Figure 3 This utility model Figure 2 Sectional view along line BB; Figure 4 This is the second state front view of the present invention. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-4 This utility model provides an adjustable height rubber foot pad, including a leg connecting sleeve 1 and a bottom movable foot pad 2. A rotating adjustment rod structure 3 is connected between the leg connecting sleeve 1 and the bottom movable foot pad 2. The two ends of the rotating adjustment rod structure 3 are connected between the leg connecting sleeve 1 and the bottom movable foot pad 2 and are provided with a positive and negative threaded connection structure 4. A relative rotation limiting structure 5 is provided between the leg connecting sleeve 1 and the bottom movable foot pad 2. Limiting constraint: The vertical guide groove 501 on the outer wall of the leg connecting sleeve 1 slides with the vertical guide rod 502 on the bottom movable foot pad 2, which can limit the circumferential rotation of the bottom movable foot pad 2 relative to the leg connecting sleeve 1, and only retain the relative movement freedom of the two along the axial direction of the intermediate shaft 301, providing a stable motion guide for the threaded transmission.

[0017] Adjustment trigger: Drive the internal hexagon adjustment part 100 at the lower end of the intermediate shaft 301 with a special tool, which will drive the intermediate shaft 301 of the rotating adjustment rod structure 3 to rotate.

[0018] Synchronous transmission of forward and reverse threads: the forward external threads 401 at both ends of the intermediate shaft 301 engage with the forward internal threads on the inner wall of the first shaft hole 302, and the reverse external threads 402 engage with the reverse internal threads on the inner wall of the second shaft hole 303; when the intermediate shaft 301 rotates, the leg connecting sleeve 1 will move closer or further away from the intermediate shaft 301 along the axial direction, and at the same time, the bottom movable foot pad 2 will move in the opposite direction along the axial direction at twice the speed of the single thread due to the action of the reverse thread.

[0019] The superposition of the above-mentioned bidirectional synchronous movement can achieve efficient adjustment of the axial distance between the leg connecting sleeve 1 and the bottom movable foot pad 2, achieving the effect of completing a large distance height adjustment with a small torque; and the self-locking characteristic of the thread itself can maintain the adjusted height position, ensuring the stability of use.

[0020] The rotary adjustment rod structure 3 of this utility model includes an intermediate shaft 301, a first shaft hole 302 is provided at the lower end of the leg connecting sleeve 1, and a second shaft hole 303 is provided at the upper end of the bottom movable foot pad 2.

[0021] The positive and negative threaded connection structure 4 of this utility model includes a positive internal thread provided on the inner wall of the first shaft hole 302, a negative internal thread provided on the inner wall of the second shaft hole 303, and positive external threads 401 and negative external threads 402 respectively provided on the outer circumferences of both ends of the intermediate shaft 301. The positive external threads 401 and the positive internal threads are threaded together, and the negative external threads 402 and the negative internal threads are threaded together.

[0022] The relative rotation limiting structure 5 of this utility model includes a vertical guide groove 501 disposed on the outer wall of the leg connecting sleeve 1, and a vertical guide rod 502 disposed on the bottom movable foot pad 2, the vertical guide rod 502 being movably installed in the vertical guide groove 501.

[0023] The vertical guide groove 501 restricts the vertical guide rod 502 from rotating the bottom movable foot pad 2 relative to the leg connecting sleeve 1 in a circular motion, but the leg connecting sleeve 1 can be adjusted in the axial direction relative to the leg connecting sleeve 1. At this time, rotating the rotary adjustment rod structure 3 causes the positive external thread 401 of the intermediate shaft 301 to engage with the positive internal thread, causing the intermediate shaft 301 to move away from or closer to the leg connecting sleeve 1. Simultaneously, the negative external thread 402 engages with the negative internal thread, causing the bottom movable foot pad 2 to move away from or closer to the leg connecting sleeve 1 at twice the speed of the intermediate shaft 301, thus achieving a larger gap adjustment with a smaller torque. The vertical guide groove 501 and vertical guide rod 502 of this utility model are arranged in the same direction as the axial direction of the intermediate shaft rod 301.

[0024] The lower end of the intermediate shaft 301 of this utility model is provided with an internal hexagonal adjustment part 100.

[0025] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adjustable height rubber foot pad, characterized in that: It includes a leg connecting sleeve (1) and a bottom movable foot pad (2). A rotating adjustment rod structure (3) is connected between the leg connecting sleeve (1) and the bottom movable foot pad (2). The two ends of the rotating adjustment rod structure (3) are connected between the leg connecting sleeve (1) and the bottom movable foot pad (2) and are provided with a positive and negative thread connection structure (4). A relative rotation limiting structure (5) is provided between the leg connecting sleeve (1) and the bottom movable foot pad (2).

2. The adjustable height rubber foot pad according to claim 1, characterized in that: The rotating adjustment rod structure (3) includes an intermediate shaft (301), the lower end of the leg connecting sleeve (1) is provided with a first shaft hole (302), and the upper end of the bottom movable foot pad (2) is provided with a second shaft hole (303).

3. The adjustable height rubber foot pad according to claim 2, characterized in that: The positive and negative thread connection structure (4) includes a positive internal thread provided on the inner wall of the first shaft hole (302), a negative internal thread provided on the inner wall of the second shaft hole (303), and positive external threads (401) and negative external threads (402) respectively provided on the outer circumferences of both ends of the intermediate shaft (301). The positive external thread (401) and the positive internal thread are threaded together, and the negative external thread (402) and the negative internal thread are threaded together.

4. The adjustable height rubber foot pad according to claim 3, characterized in that: The relative rotation limiting structure (5) includes a vertical guide groove (501) disposed on the outer wall of the leg connecting sleeve (1), and a vertical guide rod (502) is disposed on the bottom movable foot pad (2), and the vertical guide rod (502) is movably installed in the vertical guide groove (501).

5. The adjustable height rubber foot pad according to claim 4, characterized in that: The vertical guide groove (501) and the vertical guide rod (502) are set in the same direction as the axial direction of the intermediate shaft rod (301).

6. The adjustable height rubber foot pad according to claim 5, characterized in that: The lower end of the intermediate shaft (301) is provided with an internal hexagonal adjustment part (100).

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