Chain type joint assembly

Abstract

The utility model discloses a chain type joint assembly which comprises a joint body, a connecting piece, a limiting sleeve and a chain plate assembly. A mounting cavity is formed in the upper end of the joint body, and a connecting cavity is formed in the lower end of the joint body; the connecting piece is rotatably mounted in the mounting cavity of the joint body, and a connecting part is arranged on the outer wall of the connecting piece; the limiting sleeve is fixedly mounted in the connecting cavity, the limiting sleeve communicates with the mounting cavity, and a reset spring is arranged in the limiting sleeve; one end of the chain plate assembly is rotationally connected with the outer wall of the connecting piece, and the other end of the chain plate assembly is connected with the reset spring. When the connecting piece rotates in the forward direction, the chain plate assembly surrounds the connecting part, the reset spring is in a compressed energy storage state under stress, and the reset spring is used for driving the connecting piece to rotate in the reverse direction.

Description

Technical Field

[0001] The utility model relates to the technical field of prostheses, in particular to artificial joints. Background Art

[0002] In prosthetic products, the extension of the joint is achieved by relying on the reaction force of the reset spring and the traction mechanism. The traction mechanism of the existing artificial joints generally uses a steel cable. When the steel cable is used as the traction mechanism, the swing of the lower arm of the joint causes the steel cable to periodically bend and wrap around the groove of the lower arm, then straighten and wrap around again. Since the steel cable and the upper fixing ring are fixed together by pressure, the slippage of the steel cable is limited, resulting in great stress on the steel cable near the upper fixing ring during the swinging. The repeated swinging causes the steel cable to bend and straighten repeatedly, which can easily lead to the breakage of the steel cable. Utility Model Content

[0003] In view of this, the utility model provides a chain joint assembly, which is used to solve the problem that the traction cable of the artificial joint in the prior art is easy to break.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model proposes: a chain joint assembly, including: a joint body, a connecting piece, a limiting sleeve, and a chain plate assembly;

[0005] The upper end of the joint body is provided with a mounting cavity, and the lower end of the joint body is provided with a connecting cavity;

[0006] The connecting member is rotatably mounted in the mounting cavity of the joint body, and a connecting portion is provided on the outer wall of the connecting member;

[0007] The limiting sleeve is fixedly installed in the connecting cavity, and the limiting sleeve is communicated with the installation cavity, and a return spring is arranged in the limiting sleeve;

[0008] One end of the chain plate assembly is rotatably connected to the outer wall of the connecting piece, and the other end of the chain plate assembly is connected to a return spring; when the connecting piece rotates forward, the chain plate assembly surrounds the connecting portion, and the return spring is stressed and is in a compressed energy storage state, and the return spring is used to drive the connecting piece to rotate in the reverse direction.

[0009] Preferably, the chain plate assembly comprises a chain plate and a traction rope;

[0010] One end of the chain plate is rotatably connected to the outer wall of the connecting piece, and the other end of the chain plate is used to be hinged to one end of the traction rope, and the other end of the traction rope is placed in the limiting sleeve and connected to the reset spring.

[0011] Preferably, the chain plate is provided with a plurality of sections, and the plurality of chain plates are hinged at the head and tail.

[0012] Preferably, the connecting portion is a pad, the pad is mounted on the outer wall of the connecting piece, and an arc-shaped groove is provided on the pad, and the arc-shaped groove is used to contact the chain plate.

[0013] Preferably, the chain plate is an arc-shaped structure, and the curvature of the chain plate is the same as the curvature of the arc-shaped groove.

[0014] Preferably, a T-shaped seat is provided at one end of the return spring away from the installation cavity, and the other end of the traction rope is coaxially fixedly connected to the T-shaped seat.

[0015] Preferably, the hinge point between the chain plate and the connecting piece, the hinge point between the chain plate and the traction rope, and the axis of the traction rope are on the same vertical plane.

[0016] Preferably, the limiting sleeve is opened at both ends, the diameter of the upper opening of the limiting sleeve is smaller than the outer diameter of the reset spring, and the diameter of the lower opening of the limiting sleeve is larger than the outer diameter of the reset spring.

[0017] Preferably, a buffer block is further included, the connecting member is provided with a limiting groove, the buffer block is installed at the edge of the bottom wall of the installation cavity, the limiting groove can abut against the top of the buffer block, and the buffer block is used to limit the reverse rotation of the connecting member.

[0018] Preferably, the traction rope is a steel cable.

[0019] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0020] After adopting the above-mentioned chain joint assembly, the reset spring and the connecting piece are connected by a bendable chain plate assembly, so that when the connecting piece rotates repeatedly, the chain plate assembly itself has a multi-section chain structure, which can adapt to the bending and will not break due to stress, thereby improving the service life of the chain joint assembly and solving the technical problem of easy breakage caused by direct connection of steel cables with traditional artificial joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] in:

[0023] Figure 1 This is a schematic diagram of the overall structure of the chain joint assembly proposed by the utility model;

[0024] Figure 2This is an exploded view of the overall structure of the chain joint assembly proposed by the utility model;

[0025] Figure 3 This is a cross-sectional view of the overall structure of the chain joint assembly proposed by the utility model;

[0026] Figure 4 This is a schematic structural diagram of the connecting piece of the chain joint assembly proposed in the present invention.

[0027] Figure numerals: 1 joint body, 10 installation cavity, 11 connecting cavity, 2 connecting piece, 20 connecting part, 201 pad, 202 arc-shaped groove, 21 limiting groove, 3 limiting sleeve, 30 return spring, 31 T-type seat, 4 chain plate assembly, 40 chain plate, 41 traction rope, 5 buffer block. DETAILED DESCRIPTION

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] like Figure 1-4 The example shown is an embodiment provided by the utility model.

[0032] The embodiment of the utility model provides a chain joint assembly, which includes: a joint body 1, a connecting piece 2, a limiting sleeve 3, and a chain plate assembly 4; an installation cavity 10 is provided at the upper end of the joint body 1, and a connecting cavity 11 is provided at the lower end of the joint body 1; the connecting piece 2 can be rotatably installed in the installation cavity 10 of the joint body 1, and a connecting portion 20 is provided on the outer wall of the connecting piece 2; the limiting sleeve 3 is fixedly installed in the connecting cavity 11, and the limiting sleeve 3 is communicated with the installation cavity 10, and a reset spring 30 is provided in the limiting sleeve 3; one end of the chain plate assembly 4 is rotatably connected to the outer wall of the connecting piece 2, and the other end of the chain plate assembly 4 is connected to the reset spring 30; when the connecting piece 2 rotates forward, the chain plate assembly 4 surrounds the connecting portion 20, and the reset spring 30 is stressed and is in a compressed energy storage state, and the reset spring 30 is used to drive the connecting piece 2 to rotate in the reverse direction.

[0033] Specifically, the mounting cavity 10 of the joint body 1 has a hollow structure with upper and front openings, a hole for connecting to the thigh is provided at the upper opening, and the front opening facilitates the end of the connecting member 2 to rotate out of the mounting cavity 10 when the connecting member 2 rotates forward, thereby realizing the natural bending of the joint. In this embodiment, a hole for connecting to the thigh is also provided at the end of the connecting member 2, and a four-bar linkage is formed by the end holes of the connecting member 2, the holes at the upper opening of the joint body 1 and the different positions of the upper leg, so as to facilitate free bending and extension of the joint; the connecting cavity 11 at the lower end of the joint body 1 is convenient for accommodating the limiting sleeve 3 on the one hand, and on the other hand, the side wall opening of the connecting cavity 11 There are cracks and holes to facilitate the connection of the connecting cavity 11 to the calf part; in order to enable the connecting member 2 to be reset after positive rotation, the present embodiment sets a chain plate assembly 4 between the outer wall of the connecting member 2 and the reset spring 30. When the connecting member 2 rotates forward, the chain plate assembly 4 bends itself and conforms to the curvature of the outer wall of the connecting member 2, so that the chain plate assembly 4 of the connecting member 2 surrounds the connecting part 20 of the connecting member 2. At this time, the reset spring 30 is compressed to store energy. When the external force is released, the reset spring 30 drives the chain plate assembly 4 from the bent state surrounding the connecting part 20 to the extended state, thereby driving the connecting member 2 to rotate in the opposite direction.

[0034] In general, this embodiment connects the reset spring 30 and the connecting member 2 through a bendable chain plate assembly 4, so that when the connecting member 2 rotates repeatedly, the chain plate assembly 4 itself is a multi-section chain structure, which can adapt to the bending and will not break due to stress, thereby improving the service life of the chain joint assembly and solving the technical problem of easy breakage caused by direct connection of steel cables with traditional artificial joints.

[0035] See attached Figure 2 and attached Figure 3The chain plate assembly 4 includes a chain plate 40 and a traction rope 41; one end of the chain plate 40 is rotatably connected to the outer wall of the connecting member 2, and the other end of the chain plate 40 is used to be hinged with one end of the traction rope 41, and the other end of the traction rope 41 is placed in the limiting sleeve 3 and connected to the reset spring 30. Specifically, the chain plate 40 is provided with multiple sections, and the multiple-section chain plate 40 is hinged at the head and tail. The bending caused by the rotation of the connecting member 2 is conformed to by the chain plate 40 hinged at the head and tail, and then connected to the reset spring 30 through the traction rope 41. In this embodiment, the traction rope 41 is preferably a steel cable that is not easily stretched and deformed. Specifically, a T-shaped seat 31 is provided at the end of the reset spring 30 away from the installation cavity 10, and the other end of the traction rope 41 is coaxially fixedly connected to the T-shaped seat 31, that is, the other end of the traction rope 41 passes through the middle of the reset spring 30 and is fixedly connected to the T-shaped seat 31. When the multi-section chain plate 40 is bent, the traction rope 41 will be driven to move upward, and then the T-shaped seat 31 will be driven to move upward, thereby compressing the reset spring 30. Conversely, when the force on the connecting member 2 is released, the reset spring 30 will work in the reverse direction, driving the T-shaped seat 31 and the traction rope 41 to move downward, and the multi-section chain plate 40 returns to the extended state.

[0036] See attached Figure 2 The limiting sleeve 3 is provided with openings at both ends. The diameter of the upper opening of the limiting sleeve 3 is smaller than the outer diameter of the reset spring 30, and the diameter of the lower opening of the limiting sleeve 3 is larger than the outer diameter of the reset spring 30. The lower opening of the limiting sleeve 3 facilitates the installation of the reset spring 30 and the traction rope 41. The upper opening of the limiting sleeve 3 facilitates the traction rope 41 to enter the limiting sleeve 3, and the upper end of the reset spring 30 is limited, thereby improving the structural stability of the chain joint assembly.

[0037] In order to reduce the noise generated by the connection between the chain plate 40 and the connecting part 20 and reduce the wear caused by the contact between the two, in the present embodiment, the connecting part 20 is a pad 201, which is installed on the outer wall of the connecting member 2, and an arc-shaped groove 202 is provided on the pad 201, and the arc-shaped groove 202 is used to contact with the chain plate 40. Specifically, the pad 201 is made of hard plastic material, has a certain hardness, and is not easy to deform. The plastic material can effectively reduce noise and avoid wear caused by direct contact with metal parts; in order to allow the chain plate 40 to fit in the arc-shaped groove 202, the chain plate 40 of the present embodiment is an arc-shaped structure, and the curvature of the chain plate 40 is the same as the curvature of the arc-shaped groove 202, so that when the connecting member 2 rotates, the inner side of the chain plate 40 can fit on the groove wall of the arc-shaped groove 202. In other embodiments, the chain plate assembly 4 includes only one chain plate 40 and a traction rope 41, and the length of the chain plate 40 corresponds to the length of the arc-shaped groove 202, that is, the two ends of the single arc-shaped chain plate 40 are respectively hinged to one end of the traction rope 41 and the end of the arc-shaped groove 202. When the connecting member 2 rotates in the forward direction, it can drive the single chain plate 40 to fit into the arc-shaped groove 202, thereby driving the traction rope 41 to move upward and causing the T-shaped seat 31 to compress the reset spring 30. Conversely, the traction rope 41 is driven to move downward through the reset spring 30, and the chain plate 40 swings in the direction of not fitting the arc-shaped groove 202, and drives the connecting member 2 to rotate in the opposite direction.

[0038] It should also be noted that the hinge points of the chain plate 40 and the connecting member 2, the hinge points of the chain plate 40 and the traction rope 41, and the axis of the traction rope 41 are in the same vertical plane. When the connecting member 2 rotates, the hinge points of the chain plate 40 and the connecting member 2 are laterally displaced, and the hinge points of the chain plate 40 and the traction rope 41 move upward, driving the traction rope 41 to move upward. The rotation angle of the connecting member 2 limits the hinge points of the chain plate 40 and the traction rope 41 to only move up and down, and cannot be laterally displaced, so that the traction rope 41 will not bend during the up and down movement, thereby avoiding repeated bending and breakage of the traction rope 41.

[0039] See attached Figure 2 and attached Figure 4 The chain joint assembly also includes a buffer block 5. The connecting member 2 is provided with a limiting groove 21. The buffer block 5 is installed at the edge of the bottom wall of the installation cavity 10. The limiting groove 21 can be abutted against the top of the buffer block 5. The buffer block 5 is used to limit the reverse rotation of the connecting member 2. Specifically, the upper end of the buffer block 5 has an arc transition, and the groove wall of the limiting groove 21 is correspondingly set to an arc shape. Through the arc surface contact, the collision force between the two when in contact is reduced. The buffer block 5 is made of hard rubber material and contacts with the metal part through the hard rubber, which reduces the wear of the two when in contact, reduces noise, and limits the reverse rotation of the connecting member 2, thereby improving the structural rationality and stability of the chain joint assembly.

[0040] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A chain joint assembly, characterized in that: include: Joint body, connector, limit sleeve, chain plate assembly; The upper end of the joint body is provided with a mounting cavity, and the lower end of the joint body is provided with a connecting cavity; The connecting member is rotatably mounted in the mounting cavity of the joint body, and a connecting portion is provided on the outer wall of the connecting member; The limiting sleeve is fixedly installed in the connecting cavity, and the limiting sleeve is communicated with the installation cavity, and a return spring is arranged in the limiting sleeve; One end of the chain plate assembly is rotatably connected to the outer wall of the connecting piece, and the other end of the chain plate assembly is connected to a return spring; when the connecting piece rotates forward, the chain plate assembly surrounds the connecting portion, and the return spring is stressed and is in a compressed energy storage state, and the return spring is used to drive the connecting piece to rotate in the reverse direction.

2. The chain joint assembly according to claim 1, characterized in that: The chain plate assembly comprises a chain plate and a traction rope; One end of the chain plate is rotatably connected to the outer wall of the connecting piece, and the other end of the chain plate is used to be hinged to one end of the traction rope, and the other end of the traction rope is placed in the limiting sleeve and connected to the reset spring.

3. The chain joint assembly according to claim 2, characterized in that: The connecting portion is a pad, which is mounted on the outer wall of the connecting piece and is provided with an arc-shaped groove, which is used for contacting the chain plate.

4. The chain joint assembly according to claim 3, characterized in that: The chain plate is an arc-shaped structure, and the curvature of the chain plate is the same as the curvature of the arc-shaped groove.

5. The chain joint assembly according to claim 4, characterized in that: The chain plate is provided with a plurality of sections, and the plurality of chain plates are hinged at the head and tail.

6. The chain joint assembly according to claim 2, characterized in that: A T-shaped seat is provided at one end of the return spring away from the installation cavity, and the other end of the traction rope is coaxially fixedly connected to the T-shaped seat.

7. The chain joint assembly according to claim 6, characterized in that: The hinge points of the chain plate and the connecting piece, the hinge points of the chain plate and the traction rope, and the axis of the traction rope are located on the same vertical plane.

8. The chain joint assembly according to claim 6, characterized in that: The limiting sleeve is provided with openings at both ends, the diameter of the upper opening of the limiting sleeve is smaller than the outer diameter of the reset spring, and the diameter of the lower opening of the limiting sleeve is larger than the outer diameter of the reset spring.

9. The chain joint assembly according to claim 2, characterized in that: It also includes a buffer block. The connecting piece is provided with a limiting groove. The buffer block is installed at the edge of the bottom wall of the installation cavity. The limiting groove can abut against the top of the buffer block. The buffer block is used to limit the reverse rotation of the connecting piece.

10. The chain joint assembly according to claim 6, characterized in that: The traction rope is a steel cable.

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