CN117179985A - Joint drafting assembly and brace - Google Patents

Abstract

The invention relates to a joint drafting assembly and a brace, which are used under the normal condition, and when the included angle between a first arm and a second arm is required to be adjusted in a small range, a locking assembly is switched to an engaged state, namely a second driving piece is fixedly arranged on a rotating shaft through the locking assembly so as to keep synchronous rotation with the rotating shaft, the first driving piece is driven to rotate, the second driving piece is driven to rotate, and the rotating shaft drives the second arm to rotate, so that the included angle between the first arm and the second arm is adjusted; when the included angle between the first arm and the second arm needs to be adjusted in a large range, the locking assembly is switched to a separation state, the second driving piece and the rotating shaft can rotate around the central axis of the second driving piece, namely the second driving piece can not synchronously drive the rotating shaft to rotate when rotating, and the second arm can be directly driven to rotate in a large angle at the moment, so that the included angle between the first arm and the second arm can be adjusted to a preset value rapidly, and the operation is convenient and fast.

Description

Joint drafting assembly and brace

Technical Field

The invention relates to the technical field of medical equipment, in particular to a joint drafting assembly and a brace.

Background

After trauma or surgery, the joint needs to be fixed to limit the movement of the joint for a period of time so as to facilitate the rapid repair of tissues. Various soft tissue contractures and adhesions occur during the repair process, so that after removal of the joint fixing device, the patient may develop a different degree of joint stiffness, i.e. a partial or complete loss of range of motion, which is very common in clinic. Joint dysfunction (in particular knee/elbow flexion-extension dysfunction) can greatly affect the daily life of a patient.

Drafted therapy is the primary rehabilitation means to achieve a greater range of joint motion and can be used to treat joint stiffness due to soft tissue contracture. The principle is that soft tissues such as joint capsules, tendons, ligaments and the like have viscoelastic properties, and the soft tissues can be induced to generate plastic deformation (permanent elongation) after continuous stretching at the final position of joint movement. Static progressive distraction (Static progressive stretching, SPS) refers to the application of distraction forces to fix the joint at a position at the end of the range of motion, with the force required to maintain this position decreasing as the soft tissue is elongated, and then advancing the fixed position, repeating this to achieve a progressively increasing articulation angle.

Currently, a draft brace generally includes a first arm and a second arm rotatably connected. When the included angle between the first arm and the second arm needs to be adjusted, the first arm and the second arm can be driven to rotate relatively only in a gradually slow adjusting mode, meanwhile, the relative rotation of the first arm and the second arm cannot be realized in a flexible and diversified mode according to treatment requirements, the operation is inconvenient, and time and labor are wasted.

Disclosure of Invention

The invention provides a joint drafting assembly and a brace, which are used for solving one or more technical problems in the prior art.

The technical scheme is as follows: a joint draft assembly, the joint draft assembly comprising: the device comprises a first arm, a second arm and a rotating shaft, wherein one end of the first arm is rotationally connected with the rotating shaft, and one end of the second arm is fixedly connected with the rotating shaft, so that the second arm can keep synchronous rotation with the rotating shaft; the first driving piece is connected with the second driving piece, the first driving piece is used for driving the second driving piece to rotate, and the central axis of the second driving piece coincides with the central axis of the rotating shaft; the locking assembly is movably connected with the rotating shaft and is provided with an engagement state and a separation state; when the locking assembly is switched to the engagement state, the second driving piece is connected to the rotating shaft through the locking assembly, so that the second driving piece and the rotating shaft are driven by the first driving piece to keep synchronous rotation; when the locking assembly is switched to the separated state, the second driving piece and the rotating shaft can rotate around the central axis of the second driving piece and the rotating shaft.

In some embodiments, the first drive is a worm and the second drive is a worm gear that mates with the worm.

In some embodiments, the second driving member is provided with a through hole, the rotating shaft is arranged in the through hole in a penetrating way and is in clearance fit with the through hole, the rotating shaft is also provided with an axial hole arranged along the central axis direction of the rotating shaft, and a movable hole which is positioned on the side wall of the rotating shaft and is communicated with the axial hole; the locking component comprises a pushing piece movably arranged in the axial hole and a movable piece mutually abutting against the pushing piece; the movable piece is movably arranged in the movable hole; the pushing piece can drive the movable piece to move towards the direction far away from the central axis so that the movable piece is in abutting connection with the hole wall of the through hole, and can drive the movable piece to move towards the direction close to the central axis so that the movable piece is separated from the hole wall of the through hole.

In some embodiments, the number of the movable holes is at least two, and the number of the movable pieces is at least two and correspondingly arranged in the movable holes.

In some embodiments, the hole wall of the through hole is provided with at least two positioning parts, and the distance between the positioning parts and the central axis is larger than the distance between other parts on the hole wall of the through hole and the central axis; when the locking assembly is switched to the engagement state, the movable piece is abutted with the positioning part.

In some embodiments, the axial cross section of the through hole is a polygon, and the vertex of the polygon is the positioning portion.

In some embodiments, the polygon is a regular polygon; and/or the movable piece is a sphere or an ellipsoid.

In some embodiments, the pusher is in the first position when the locking assembly is switched to the engaged state; when the locking assembly is switched to the separation state, the pushing piece is positioned at the second position; the joint draft assembly further includes a reset member coupled to the pusher member for driving the pusher member from the second position to the first position.

In some embodiments, the moveable aperture is a tapered aperture that gradually decreases in aperture in a direction away from the central axis.

In some embodiments, the pushing member is a movable rod movably arranged in the axial hole along the central axis, the pushing member is provided with a first abutting section and a second abutting section which are sequentially arranged along the central axis, the diameter of the first abutting section is larger than that of the second abutting section, and when the first abutting section abuts against the movable member, the movable member abuts against and is fixed with the hole wall of the through hole; when the second abutting section abuts against the movable piece, the movable piece is separated from the hole wall of the through hole.

In some embodiments, the pushing member is a rotating rod rotatably disposed in the axial hole around the central axis, the rotating rod is provided with an abutting section corresponding to the position of the movable member, the outer wall surface of the abutting section comprises a first wall surface and a second wall surface which are disposed around the central axis, the distance between the first wall surface and the central axis is larger than the distance between the second wall surface and the central axis, and when the first wall surface abuts against the movable member, the movable member abuts against and is fixed with the hole wall of the through hole; when the second wall surface is abutted with the movable piece, the movable piece is separated from the wall of the through hole.

In some embodiments, the joint draft assembly further comprises a limit mechanism disposed on the second drive member; the limiting mechanism is used for abutting against the first arm when the second arm rotates to the limit angle position so as to limit the second arm to rotate.

In some embodiments, the limiting mechanism includes a mounting plate and an insert connected to the mounting plate, the mounting plate is rotationally sleeved on the rotating shaft, the second driving member is provided with a plurality of jacks spaced around the central axis, and the insert can be set in any one of the jacks.

In some embodiments, the first driving member is rotatably disposed at one end of the first arm, and the second driving member is rotatably disposed at one end of the second arm.

In some embodiments, a first rotating plate and a second rotating plate are arranged at one end of the first arm at intervals, and the first rotating plate and the second rotating plate are both sleeved on the rotating shaft in a rotating way; a third rotating plate and a fourth rotating plate which are spaced are arranged at one end of the second arm, and the third rotating plate and the fourth rotating plate are sleeved on the rotating shaft and can synchronously rotate with the rotating shaft; the third rotating plate, the first rotating plate, the second driving piece, the second rotating plate and the fourth rotating plate are sequentially arranged along the central axis.

In some embodiments, the first rotating plate is sleeved on the rotating shaft through a first wear sleeve, and the second rotating plate is sleeved on the rotating shaft through a second wear sleeve; and the rotating shaft is also sleeved with two wear-resistant check rings, one wear-resistant check ring is positioned between the second driving piece and the first rotating plate, and the other wear-resistant check ring is positioned between the second driving piece and the second rotating plate.

In some embodiments, the joint draft assembly further comprises an angle sensor disposed on the first arm for sensing a rotation angle of the rotating shaft.

In another aspect, the present invention provides a joint draft brace comprising a joint draft assembly according to any of the preceding embodiments, further comprising a first support sheath coupled to the first arm and a second support sheath coupled to the second arm.

The beneficial effects are that: when the joint drafting assembly and the brace are used, the locking assembly is switched to the joint state when the included angle between the first arm and the second arm is required to be adjusted in a small range, namely the second driving piece is fixedly arranged on the rotating shaft through the locking assembly so as to keep synchronous rotation with the rotating shaft, the first driving piece is driven to rotate, the first driving piece drives the second driving piece to rotate, the second driving piece drives the rotating shaft to rotate, and the rotating shaft drives the second arm to rotate, so that the included angle between the first arm and the second arm is adjusted; when needing to adjust the contained angle of first arm and second arm on a large scale for locking subassembly switches to the separation state, and second driving piece and axis of rotation can rotate each other around its central axis, can not synchronous drive the axis of rotation when the second driving piece rotates, can direct drive the big angle rotation of second arm this moment, can adjust the contained angle of first arm and second arm to the default fast, thereby is satisfied with the demand, and the operation is comparatively convenient and fast.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a joint draft brace according to an embodiment of the present application;

FIG. 2 is a schematic view of one view of a joint draft assembly according to an embodiment of the present application;

FIG. 3 is a schematic view of another view of a joint draft assembly according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a joint draft assembly according to an embodiment of the present application;

FIG. 5 is a schematic view of an exploded view of a joint draft assembly according to an embodiment of the present application;

FIG. 6 is a schematic view of the structure shown in FIG. 5 with the first and second arms hidden;

FIG. 7 is a schematic view of a moving member according to an embodiment of the present invention when the moving member extends out of the moving hole;

FIG. 8 is a schematic structural view of a movable member abutting against a first abutting section of a pushing member according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a second driving member according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of the movable member according to an embodiment of the present invention when the movable member abuts against and is fixed to the positioning portion of the hole wall of the through hole.

10. A joint draft assembly; 11. a first arm; 111. a first rotating plate; 112. a second rotating plate; 113. a first wear sleeve; 114. a second wear sleeve; 115. wear-resistant check rings; 12. a second arm; 121. a third rotating plate; 122. a fourth rotating plate; 123. a mounting hole; 13. a rotating shaft; 131. an axial bore; 132. a movable hole; 133. a shaft body; 134. a positioning sleeve; 135. a mounting part; 14. a first driving member; 141. a connection part; 15. a second driving member; 151. a through hole; 1511. a positioning part; 152. a jack; 16. a locking assembly; 161. a pushing member; 1611. a first abutment section; 1612. a second abutment section; 1613. a transition section; 1614. a pushing plate; 162. a movable member; 163. a reset member; 17. a limiting mechanism; 171. a mounting plate; 172. an insert; 18. an angle sensor; 20. a first support sheath; 30. a second support sheath.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

The joints include knee joints, elbow joints, wrist joints, ankle joints, hip joints, shoulder joints, hand-foot joints, temporomandibular joints and other joints which can be treated by the whole body of the human body or the animal body by the drafting principle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a joint draft brace according to an embodiment of the present invention, and in one embodiment, a joint draft brace includes a joint draft assembly 10, and further includes a first support sheath 20 and a second support sheath 30. The first support sheath 20 is connected to the first arm 11 and the second support sheath 30 is connected to the second arm 12. Taking the elbow joint as an example, when the first supporting sheath 20 supports the forearm, for example, the second supporting sheath 30 correspondingly supports the upper arm; when the first support sheath 20 supports, for example, the upper arm, the second support sheath 30 correspondingly supports the forearm.

Referring to fig. 2 to 5, fig. 2 is a schematic view of a joint draft assembly 10 according to an embodiment of the present invention; FIG. 3 illustrates another perspective structural view of the joint draft assembly 10 according to one embodiment of the present invention; FIG. 4 shows a schematic cross-sectional view of the joint draft assembly 10 of one embodiment of the present invention;

fig. 5 shows a schematic exploded view of the joint draft assembly 10 according to one embodiment of the present invention. Specifically, the joint draft assembly 10 includes: the first arm 11, the second arm 12, the rotating shaft 13, the first driving member 14, the second driving member 15, and the locking assembly 16. One end of the first arm 11 is rotatably connected to the rotation shaft 13, and one end of the second arm 12 is fixedly connected to the rotation shaft 13 so that the second arm 12 can be rotated in synchronization with the rotation shaft 13. The first driving member 14 is rotatably disposed at one end of the first arm 11, the first driving member 14 is connected to the second driving member 15, and the first driving member 14 is used for driving the second driving member 15 to rotate. The second driving member 15 is rotatably disposed at one end of the second arm 12, and a central axis (e.g., a dotted line O in fig. 3) of the second driving member 15 coincides with a central axis of the rotation shaft 13. The locking component 16 is movably arranged on the rotating shaft 13, and the locking component 16 is provided with an engaged state and a separated state; when the lock assembly 16 is switched to the engaged state, the second driving member 15 is fixedly disposed on the rotation shaft 13 through the lock assembly 16 so that the second driving member 15 and the rotation shaft 13 keep rotating in synchronization; when the lock assembly 16 is switched to the disengaged state, the second driving member 15 and the rotation shaft 13 can rotate with each other about their central axes. Namely, in the state, the second driving piece 15 and the rotating shaft 13 do not synchronously rotate, and the second driving piece does not synchronously drive the rotating shaft to rotate when rotating, so that the second arm can be directly driven to rotate at a large angle, and the included angle between the first arm and the second arm can be quickly adjusted to a preset value, thereby meeting the requirements and being convenient and quick to operate.

It should be noted that, the fixed connection of one end of the second arm 12 to the rotation shaft 13 means that the rotation shaft 13 can synchronously drive the second arm 12 to rotate when rotating around its central axis, so that both the second arm 12 and the rotation shaft 13 keep rotating synchronously. Alternatively, one end of the second arm 12 is specifically provided with a mounting hole 123, and the shape of the mounting hole 123 is, for example, a triangle, square, pentagon, or other polygonal shape, or may be an ellipse, or other regular shape, or may be other irregular shape, as long as it is not designed to be circular, and accordingly, the rotation shaft 13 is provided with a mounting portion 135 that is mounted in the mounting hole 123 and has a shape that matches the mounting hole 123. Of course, one end of the second arm 12 may be fixed on the rotation shaft 13 by welding, or may be detachably mounted on a fixed shaft, etc., which is not limited herein, and may be flexibly adjusted and set according to actual needs.

It should be further noted that, the second driving member 15 is fixedly disposed on the rotating shaft 13 through the locking assembly 16 means that the second driving member 15 can synchronously drive the rotating shaft 13 to rotate when rotating around its central axis, so that the second driving member 15 and the rotating shaft 13 keep rotating synchronously.

In the use process of the joint drafting assembly 10, when the angle between the first arm 11 and the second arm 12 needs to be adjusted in a small range under the normal use condition, the locking assembly 16 is switched to the engaged state, that is, the second driving member 15 is fixedly arranged on the rotating shaft 13 through the locking assembly 16 to keep synchronous rotation with the rotating shaft 13, so as to drive the first driving member 14 to rotate, the first driving member 14 drives the second driving member 15 to rotate, the second driving member 15 drives the rotating shaft 13 to rotate, and the rotating shaft 13 drives the second arm 12 to rotate, thereby realizing the adjustment of the angle between the first arm 11 and the second arm 12; when the included angle between the first arm 11 and the second arm 12 needs to be adjusted in a large range, the locking assembly 16 is switched to a separated state, the second driving piece 15 and the rotating shaft 13 can rotate around the central axis of the second driving piece, namely, the second driving piece 15 can not synchronously drive the rotating shaft 13 to rotate when rotating, and the second arm 12 can be directly driven to rotate in a large angle at the moment, so that the included angle between the first arm 11 and the second arm 12 can be quickly adjusted to a preset value, the requirements are met, and the operation is convenient and quick.

Referring to fig. 5 and 6, fig. 6 is a schematic diagram illustrating the structure shown in fig. 5 with the first arm 11 and the second arm 12 hidden. In one embodiment, the first driver 14 is a worm and the second driver 15 is a worm wheel that mates with the worm. Thus, the locking assembly 16 is in an engaged state, and when the worm is driven to rotate, the worm can correspondingly drive the worm wheel to rotate, and the worm wheel can drive the second arm 12 to rotate through the rotating shaft 13 so as to adjust the included angle of the second arm 12 relative to the first arm 11; when the worm stops rotating, the first arm 11 and the second arm 12 can be maintained at a certain included angle based on the characteristic that the worm and the worm wheel form self-locking with each other.

As an alternative, the first drive member 14 may also be provided as a first gear and the second drive member 15 may be provided as a second gear in engagement with the first gear.

Referring to fig. 6, in one embodiment, in order to facilitate driving the worm to rotate, one end of the worm is provided with a connection portion 141 for connecting with a screwdriver or a wrench, and the screwdriver or the wrench can rotate after being connected with the connection portion 141. Specifically, the connection portion 141 is a concave hole provided on one end face of the worm and adapted to the external shape of the driver, specifically, for example, a quincuncial hole, a square hole, or the like. Alternatively, the connection portion 141 may be a protrusion provided on one end portion of the worm screw and having a quincuncial or square cross section, or the like.

Referring to fig. 4 to 9, fig. 7 is a schematic structural view of a movable member extending out of a movable hole according to an embodiment of the present invention; FIG. 8 is a schematic view of a structure of a movable member of an embodiment of the present invention when the movable member abuts against a first abutting section of a pushing member; fig. 9 shows a schematic structural view of the second driving member 15 according to an embodiment of the present invention. In one embodiment, the second driving member 15 is provided with a through hole 151, the rotation shaft 13 is inserted into the through hole 151 and is in clearance fit with the through hole 151, the rotation shaft 13 is further provided with an axial hole 131 provided along the central axis direction thereof, and a movable hole 132 (shown in fig. 4 and 7) located on the side wall of the rotation shaft 13 and communicating with the axial hole 131. The locking assembly 16 includes a pushing member 161 movably disposed in the axial hole 131, and a movable member 162 abutting against the pushing member 161. The movable member 162 is movably disposed in the movable hole 132. The pushing member 161 can drive the movable member 162 to move in a direction away from the central axis so that the movable member 162 is fixed in abutment with the wall of the through hole 151 (as shown in fig. 4 and 10), and can drive the movable member 162 to move in a direction close to the central axis so that the movable member 162 is separated from the wall of the through hole 151. In this way, when the locking assembly 16 is switched to the engaged state, the pushing member 161 drives the movable member 162 to move in a direction away from the central axis, so that the movable member 162 is abutted and fixed with the wall of the through hole 151, and meanwhile, as the movable member 162 is positioned in the movable hole 132, that is, the movable member 162 can play a role in limiting the rotation of the rotating shaft 13, the second driving member 15 is kept relatively fixed with the rotating shaft 13 through the locking assembly 16, and synchronous rotation of the three members around the central axis can be realized; when the locking assembly 16 is switched to the separated state, the pushing member 161 can also drive the movable member 162 to move towards the direction close to the central axis, so that the movable member 162 is separated from the wall of the through hole 151, that is, the movable member 162 does not limit the rotation of the rotation shaft 13, and the rotation shaft 13 and the second driving member 15 can respectively rotate around the central axis without mutual influence.

Referring to fig. 7 and 8, in one embodiment, the movable member 162 includes, but is not limited to, a sphere, an ellipsoid, a movable block, or a movable rod.

Referring to fig. 4 and fig. 7, in one embodiment, the number of the movable holes 132 is at least two, and the number of the movable members 162 is at least two and is correspondingly disposed in the movable holes 132. Thus, when the locking assembly 16 is switched to the engaged state, at least two movable members 162 are synchronously abutted and fixed with the wall of the through hole 151, so that the combination effect of the second driving member 15 and the rotating shaft 13 is stable in the engaged state, and the synchronous rotation along the central axis direction is ensured.

Of course, as an alternative, the movable hole 132 may be one, and the movable member 162 may be one.

Referring to fig. 4, 7, 9 and 10, fig. 9 is a schematic structural view of the second driving member 15 according to an embodiment of the invention, and fig. 10 is a schematic structural view of the movable member 152 according to an embodiment of the invention when the positioning portion of the wall of the through hole 151 abuts against and is fixed. In one embodiment, the wall of the through hole 151 is provided with at least two positioning portions 1511. Alternatively, the axial cross section of the through hole 151 is a polygon, and the vertex of the polygon is a positioning portion 1511. In addition, the distance between the positioning portion 1511 and the central axis is greater than the distance between other portions of the wall of the through hole 151 and the central axis. When the lock assembly 16 is switched to the engaged state, the movable member 162 abuts against the positioning portion 1511. Thus, when the locking assembly 16 is switched to the engaged state, since the movable member 162 abuts against the positioning portion 1511, the movable member 162 also abuts against the pushing member 161, and the distance between the positioning portion 1511 and the central axis is greater than the distance between the other portions of the wall of the through hole 151 and the central axis, that is, the positioning portion 1511 abuts against and is fixed to the positioning portion 1511, and cannot rotate relative to the wall of the through hole 151, thereby fixing both the second driving member 15 and the rotation shaft 13.

In an alternative solution, the axial section of the through hole 151 is not limited to be polygonal, but may be other regular shapes or irregular shapes, and may be flexibly adjusted and set according to actual requirements.

Referring to fig. 4 and 10, in one embodiment, the polygon is a regular polygon; and/or the movable member 162 is a sphere or an ellipsoid. Thus, when the polygon is a regular polygon and the movable member 162 is a sphere or an ellipsoid, the movable member 162 can smoothly move to and abut against the positioning portion 1511 during the process of switching from the separated state to the engaged state.

As a specific example, the polygon is, for example, a regular hexagon or a regular nine-sided polygon (as shown in fig. 9 and 10), the movable members 162 are respectively three, and are provided as spheres or ellipsoids, and the movable holes 132 are three, and are arranged on the side wall of the rotation shaft 13 at equal intervals around the central axis.

As a specific example, the polygon is, for example, a regular quadrangle, a regular octagon, or a regular dodecagon, and the movable pieces 162 are, for example, four in correspondence, and are provided as spheres or ellipsoids, and the movable holes 132 are four in number and are arranged on the side wall of the rotation shaft 13 at equal intervals around the central axis.

Referring to fig. 4-6, in some embodiments, when the latch assembly 16 is switched to the engaged state, the pusher 161 is in the first position; when the lock assembly 16 is switched to the disengaged state, the pusher 161 is located at the second position; the joint draft assembly 10 further includes a return member 163 coupled to the push member 161, the return member 163 for driving the push member 161 from the second position to the first position along the central axis (O as shown in fig. 4). In this way, when the locking assembly 16 needs to be unlocked, the locking assembly 16 is switched to the separated state, and after the included angle between the first arm 11 and the second arm 12 is adjusted, the pushing member 161 is released, and under the action of the restoring force of the restoring member 163, the pushing member 161 can be moved from the second position to the first position along the central axis, so that the locking assembly 16 is quickly switched to the engaged state, manual operation is not needed, and the restoring operation is more convenient.

Specifically, the return member 163 is, for example, an elastic member or other device capable of driving the pushing member 161 to return to the first position. Wherein, when the restoring member 163 is provided as an elastic member, the elastic member includes, but is not limited to, a spring, a torsion spring, an elastic block, an elastic rod, an elastic column, or an elastic string. In this embodiment, the pushing member 161 is a pushing rod and extends out of the axial hole 131, and the elastic member is specifically a spring sleeved outside the pushing member 161, one end of the spring is connected to the pushing member 161, and the other end of the spring is directly or indirectly connected to the rotating shaft 13, the first arm 11, the second arm 12 or the limiting mechanism 17, so that the spring can provide an elastic force to enable the pushing member 161 to move along the axial direction.

Of course, in one embodiment, when the pusher member 161 is configured to rotationally move within the axial bore 131, the return member 163 is correspondingly configured as a torsion spring or elastic cord, such that the return member 163 is deformed during rotation of the pusher member 161 from the first position to the second position, such that the return member 163 provides an elastic force to move the pusher member 161 from the second position to the first position.

In one embodiment, the movable bore 132 is a tapered bore with a gradually decreasing bore diameter in a direction away from the central axis. In this way, the movable member 162 is restricted from being completely separated from the rotation shaft 13 through the movable hole 132, and stability is improved.

Referring to fig. 4, 7 and 8, specifically, the rotation shaft 13 includes a shaft body 133 and a positioning sleeve 134 fixed on the shaft body 133 by, for example, welding, bonding, clamping, riveting, and the movable hole 132 is formed in the positioning sleeve 134. In this way, the formation of the movable hole 132 on the rotation shaft 13 can be realized, so that the processing of the movable hole 132 is easier.

Of course, it will be appreciated that the moveable aperture 132 may also be produced by being formed directly on the rotatable shaft 13 without the rotatable shaft 13 being machined and assembled in two parts.

Referring to fig. 4, 5 and 8, in one embodiment, the pushing member 161 is a movable rod movably disposed in the axial hole 131 along the central axis, the pushing member 161 is provided with a first abutting section 1611 and a second abutting section 1612 sequentially disposed along the central axis, the diameter of the first abutting section 1611 is larger than that of the second abutting section 1612, and when the first abutting section 1611 abuts against the movable member 162, the movable member 162 abuts against and is fixed to the wall of the through hole 151, that is, the pushing member 161 is located at the first position; when the second abutting section 1612 abuts against the movable member 162, the movable member 162 is separated from the wall of the through hole 151, that is, the pushing member 161 is located at the second position, for example, the movable member 162 is specifically a steel ball, when the second abutting section 1612 moves to the position abutting against the steel ball, because the diameter of the second abutting section 1612 is smaller, a movable space is made for the movable member 162, and the movable member 162 is moved from the position shown in fig. 10 toward the central axis of fig. 10, so that the movable member 162 can freely rotate in the octagonal hole in fig. 10, and thus the state is a separated state, and the second abutting section 1612 and the second driving member 15 can mutually rotate.

Referring to fig. 4, 5 and 8, in one embodiment, the pushing member 161 is further provided with a transition section 1613 located between the first abutting section 1611 and the second abutting section 1612. The diameter of one end of the transition section 1613 is the same as the diameter of the first abutting section 1611, the diameter of the other end of the transition section 1613 is the same as the diameter of the second abutting section 1612, and the diameter of the transition section 1613 gradually decreases from one end to the other end. In this way, when the pushing member 161 is switched between the first position and the second position, that is, the locking assembly 16 is switched between the engaged state and the disengaged state, the movable member 162 is unlocked along the transition section 1613, so that the movement is smooth, and the noise can be reduced.

Referring to fig. 4, 5 and 8, in one embodiment, the end of the pushing member 161 protrudes outside the rotating shaft 13. And a pushing plate 1614 is provided on an end of the pushing member 161 protruding outside the rotation shaft 13. The pushing plate 1614 can increase the force receiving area, so that the pushing member 161 can be smoothly pushed to move along the central axis in the axial hole 131.

It should be noted that, the "pushing plate 1614" may be a part of the "pushing member 161", that is, the "pushing plate 1614" is integrally formed with the "other part of the pushing member 161"; or may be a separate component from the other parts of the pushing member 161, i.e., the pushing plate 1614 may be manufactured separately and then combined with the other parts of the pushing member 161 into a whole.

In another embodiment, the pushing member 161 is not limited to the above embodiment, and the pushing member 161 may be a rotating rod rotatably disposed in the axial hole 131 around the central axis, the rotating rod is provided with an abutment section corresponding to the position of the movable member 162, the outer wall surface of the abutment section includes a first wall surface and a second wall surface disposed around the central axis, the distance between the first wall surface and the central axis is greater than the distance between the second wall surface and the central axis, and when the first wall surface abuts against the movable member 162, the movable member 162 abuts against the wall of the through hole 151; when the second wall surface abuts against the movable member 162, the movable member 162 is separated from the wall of the through hole 151.

In one embodiment, the pushing member 161 is further provided with a transition wall surface located between the first wall surface and the second wall surface, and the distance from the transition wall surface to the central axis tends to decrease in a direction from one side to the other side connected to the first wall surface. In this way, when the pushing member 161 is switched between the first position and the second position, that is, the locking assembly 16 is switched between the engaged state and the disengaged state, the movable member 162 is unlocked in a manner of rotating along the transition wall surface, so that the rotation is smooth, and the noise can be reduced.

Referring to fig. 2, 5 and 6, in one embodiment, the joint draft assembly 10 further includes a limiting mechanism 17. The limiting mechanism 17 is provided on the second driving member 15. The limiting mechanism 17 is used to abut against the first arm 11 to limit the rotation of the second arm 12 when the second arm 12 rotates to the limit angle position. By providing the limiting mechanism 17 in this way, the limiting mechanism 17 limits the rotation of the position of the second arm 12, and thus the angle between the first arm 11 and the second arm 12 can be controlled to a predetermined value.

Referring to fig. 2, 5 and 6, in one embodiment, the spacing mechanism 17 includes a mounting plate 171 and an insert 172 coupled to the mounting plate 171. The mounting plate 171 is rotatably sleeved on the rotating shaft 13, the second driving member 15 is provided with a plurality of insertion holes 152 spaced around the central axis, and the insert 172 can be inserted into any one of the insertion holes 152. Thus, by adjusting the mounting position of the insert 172, the maximum or minimum angle between the first arm 11 and the second arm 12 can be adjusted accordingly.

Referring to fig. 2, 5 and 6, in one embodiment, the limiting mechanism 17 is one or two. Thus, when there are two limiting mechanisms 17, one of the limiting mechanisms can be used for controlling the maximum angle value between the first arm 11 and the second arm 12, and the other limiting mechanism can be used for controlling the minimum angle value between the first arm 11 and the second arm 12. Specifically, in order to facilitate adjustment of the maximum angle value or the minimum angle value, a scale value of the angle may be set on the second arm 12, so that the limiting mechanism 17 may refer to the adjustment position.

Referring to fig. 3, 4 or 6, in a specific embodiment, the reset member 163 is sleeved on the pushing member 161, and the reset member 163 is respectively abutted to the pushing plate 1614 and the limiting mechanism 17.

Referring to fig. 3 to 5, in one embodiment, a first rotating plate 111 and a second rotating plate 112 are spaced apart from each other at one end of the first arm 11. The first rotating plate 111 and the second rotating plate 112 are both rotatably sleeved on the rotating shaft 13. One end of the second arm 12 is provided with a third rotation plate 121 and a fourth rotation plate 122 which are spaced apart. The third rotating plate 121 and the fourth rotating plate 122 are both sleeved on the rotating shaft 13. Specifically, one of the third rotation plate 121 and the fourth rotation plate 122 is provided with a mounting hole 123, and the shape of the mounting hole 123 is, for example, a triangle, a square, a pentagon, or the like, or may be a regular shape such as an ellipse, or may be other irregular shape, as long as it is not designed in a circular shape, and accordingly, the rotation shaft 13 is provided with a mounting portion 135 that is mounted to the mounting hole 123 and has an outer shape that matches the mounting hole 123. So that the second arm 12 can be rotated in synchronization with the rotation shaft 13. Further, the third rotation plate 121, the first rotation plate 111, the second driving member 15, the second rotation plate 112, and the fourth rotation plate 122 are disposed in this order along the central axis. Therefore, the first arm 11 and the second arm 12 are connected more firmly, the second driving member 15 is disposed at a more stable and reliable position, and the operation stability is better during the rotation of the first arm 11 and the second arm 12.

Of course, the end portions of the first arm 11 and the second arm 12 may be other structures, as long as the connection with the rotation shaft 13 can be achieved, and the connection is not limited herein, and the connection can be flexibly set and adjusted according to actual requirements.

Referring to fig. 4 and fig. 5, in one embodiment, a first rotating plate 111 is sleeved on a rotating shaft 13 through a first wear-resistant sleeve 113, and a second rotating plate 112 is sleeved on the rotating shaft 13 through a second wear-resistant sleeve 114; the rotating shaft 13 is further sleeved with two wear-resistant check rings 115, wherein one wear-resistant check ring 115 is positioned between the second driving piece 15 and the first rotating plate 111, and the other wear-resistant check ring 115 is positioned between the second driving piece 15 and the second rotating plate 112. In this way, under the action of the first wear-resistant sleeve 113 and the second wear-resistant sleeve 114, the wear of the first rotating plate 111 and the second rotating plate 112 can be reduced, so that the service life is prolonged. In addition, the wear-resistant retainer ring 115 can limit the movement of the first wear-resistant sleeve 113 and the second wear-resistant sleeve 114 along the central axis, thereby enhancing the running stability.

Referring to fig. 4 and 5, in one embodiment, the joint draft assembly 10 further includes an angle sensor 18, the angle sensor 18 is disposed on the first arm 11, and the angle sensor 18 is used for sensing the rotation angle of the rotation shaft 13.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims (18)

1. A joint draft assembly, the joint draft assembly comprising:

the device comprises a first arm, a second arm and a rotating shaft, wherein one end of the first arm is rotationally connected with the rotating shaft, and one end of the second arm is fixedly connected with the rotating shaft, so that the second arm can keep synchronous rotation with the rotating shaft;

the first driving piece is connected with the second driving piece, the first driving piece is used for driving the second driving piece to rotate, and the central axis of the second driving piece coincides with the central axis of the rotating shaft; and

The locking assembly is movably connected with the rotating shaft and is provided with an engagement state and a separation state; when the locking assembly is switched to the engagement state, the second driving piece is connected to the rotating shaft through the locking assembly, so that the second driving piece and the rotating shaft are driven by the first driving piece to keep synchronous rotation; when the locking assembly is switched to the separated state, the second driving piece and the rotating shaft can rotate around the central axis of the second driving piece and the rotating shaft.

2. The knuckle draft assembly of claim 1, wherein said first drive member is a worm and said second drive member is a worm gear mated with said worm.

3. The knuckle draft assembly of claim 1, wherein said second drive member is provided with a through hole, said rotary shaft is disposed through said through hole and is in clearance fit with said through hole, said rotary shaft is further provided with an axial hole disposed along a central axis thereof, and a movable hole located on a side wall of said rotary shaft and communicating with said axial hole; the locking component comprises a pushing piece movably arranged in the axial hole and a movable piece mutually abutting against the pushing piece; the movable piece is movably arranged in the movable hole; the pushing piece can drive the movable piece to move towards the direction far away from the central axis so that the movable piece is in abutting connection with the hole wall of the through hole, and can drive the movable piece to move towards the direction close to the central axis so that the movable piece is separated from the hole wall of the through hole.

4. A joint draft assembly according to claim 3 wherein there are at least two said movable apertures and said at least two movable members are correspondingly disposed in said movable apertures.

5. The knuckle draft assembly of claim 4, wherein the wall of said through hole has at least two positioning portions, said positioning portions being spaced from said central axis by a distance greater than the distance from other portions of the wall of said through hole to said central axis; when the locking assembly is switched to the engagement state, the movable piece is abutted with the positioning part.

6. The knuckle draft assembly of claim 5, wherein the axial cross section of said through bore is polygonal and the apex of said polygon is said locating portion.

7. The joint draft assembly according to claim 6 wherein said polygon is a regular polygon; and/or the movable piece is a sphere or an ellipsoid.

8. The joint draft assembly according to claim 3 wherein said pusher is in a first position when said lock assembly is switched to said engaged condition; when the locking assembly is switched to the separation state, the pushing piece is positioned at the second position; the joint draft assembly further includes a reset member coupled to the pusher member for driving the pusher member from the second position to the first position.

9. A joint draft assembly according to claim 3 wherein said movable bore is a tapered bore having a gradually decreasing bore diameter in a direction away from the central axis.

10. The joint draft assembly according to claim 3 wherein said pusher is a movable rod movably disposed in said axial bore along said central axis, said pusher having first and second abutment sections disposed in sequence along said central axis, said first abutment section having a diameter greater than a diameter of said second abutment section, said movable member being fixedly secured in abutment with a bore wall of said through bore when said first abutment section is in abutment with said movable member; when the second abutting section abuts against the movable piece, the movable piece is separated from the hole wall of the through hole.

11. A joint draft assembly according to claim 3 wherein said pusher is a rotatable lever rotatably disposed about said central axis in said axial bore, said rotatable lever having an abutment section corresponding in position to said movable member, an outer wall surface of said abutment section including a first wall surface and a second wall surface disposed about said central axis, said first wall surface being spaced from said central axis by a distance greater than a distance of said second wall surface from said central axis, said movable member being secured in abutment with a wall of said through bore when said first wall surface is in abutment with said movable member; when the second wall surface is abutted with the movable piece, the movable piece is separated from the wall of the through hole.

12. The joint draft assembly according to claim 1 further including a limit mechanism disposed on said second drive member; the limiting mechanism is used for abutting against the first arm when the second arm rotates to the limit angle position so as to limit the second arm to rotate.

13. The joint draft assembly according to claim 12 wherein said spacing means includes a mounting plate and an insert coupled to said mounting plate, said mounting plate being rotatably journaled about said rotatable shaft, said second drive member being provided with a plurality of spaced apart receptacles about said central axis, said insert being insertable into any one of said receptacles.

14. The joint draft assembly according to claim 1 wherein said first drive member is rotatably disposed at one end of said first arm and said second drive member is rotatably disposed at one end of said second arm.

15. The joint draft assembly according to claim 1 wherein one end of said first arm is provided with spaced first and second rotating plates, said first and second rotating plates being rotatably journaled about said rotating shaft; a third rotating plate and a fourth rotating plate which are spaced are arranged at one end of the second arm, and the third rotating plate and the fourth rotating plate are sleeved on the rotating shaft and can synchronously rotate with the rotating shaft; the third rotating plate, the first rotating plate, the second driving piece, the second rotating plate and the fourth rotating plate are sequentially arranged along the central axis.

16. The joint draft assembly according to claim 15 wherein said first rotating plate is sleeved on said rotating shaft by a first wear sleeve and said second rotating plate is sleeved on said rotating shaft by a second wear sleeve; and the rotating shaft is also sleeved with two wear-resistant check rings, one wear-resistant check ring is positioned between the second driving piece and the first rotating plate, and the other wear-resistant check ring is positioned between the second driving piece and the second rotating plate.

17. The joint draft assembly according to claim 1 further including an angle sensor disposed on said first arm for sensing the angle of rotation of said rotating shaft.

18. A joint draft brace comprising a joint draft assembly according to any one of claims 1 to 17 further comprising a first support sheath connected to said first arm and a second support sheath connected to said second arm.