A seat armrest rotation limiting mechanism

Abstract

This utility model belongs to the field of seat technology, specifically relating to a seat armrest rotation limiting mechanism, including a rotating shaft, a clutch disc fixed on the rotating shaft, and an internal gear disc. The internal gear disc is rotatably connected to the rotating shaft via a bearing. Two or more positioning protrusions are circumferentially spaced on the outer side of the internal gear disc. A rectangular limiting block extends radially towards the center of the groove in the center of the internal gear disc, corresponding to one of the positioning protrusions. A locking tooth is hinged to the clutch disc via a hinge shaft. The inner side of the triangular protrusion at one end of the locking tooth has a mating surface that contacts one side of the limiting block. When the mating surface of the locking tooth rotates with the rotating shaft and the clutch disc until it contacts one side of the limiting block, the rotation of the internal gear disc on the rotating shaft is limited. The advantages are: reasonable structural design, good component strength, and the bearing with a through hole reduces the amount of mating wobble, making it suitable for seats.

Description

Technical Field

[0001] The utility model belongs to the technical field of seats, and in particular relates to a rotation limiting mechanism for a seat armrest. Background Art

[0002] The current seat armrest rotation limit mechanism generally uses an inclined hook extending from one end of the locking tooth to connect with the groove on the inner gear disc. Its shortcomings are: first, the inclined hook is not made too large, and the force angle is not good, which easily leads to cracks and breakage of the hook; second, the groove on the inner gear disc affects the strength of the inner gear disc.

[0003] In addition, due to the gap between the inner gear disc and the rotating shaft, the inner gear disc and the rotating shaft wobble a lot, causing them to collide with each other during rotation, which in turn creates noise and affects the service life. Utility Model Content

[0004] The utility model aims to provide a seat armrest rotation limiting mechanism which has reasonable force, long service life of locking teeth and reduced shaking.

[0005] The purpose of the utility model is to solve the problem as follows:

[0006] A seat armrest rotation limit mechanism comprises a rotating shaft, a clutch plate fixed on the rotating shaft and an inner gear plate, the inner gear plate is rotatably connected to the rotating shaft through a bearing, and the outer side surface of the inner gear plate is circumferentially spaced with two or more positioning protrusions, and a rectangular limit stopper is radially extended toward the center of the circle corresponding to one of the positioning protrusions on the inner wall surface of the groove centrally arranged on the inner gear plate, and a locking tooth is hingedly connected through a hinge shaft arranged on the clutch plate, and the inner side surface of the triangular protrusion arranged at one end of the locking tooth has a joint surface that contacts one side surface of the limit stopper, and when the joint surface of the locking tooth rotates together with the rotating shaft and the clutch plate until it contacts one side surface of the limit stopper, the rotation limit of the rotating shaft by the inner gear plate is formed.

[0007] As a further optimization of the above technical solution, the included angle of the triangular protrusion of the locking tooth is 80-110 degrees.

[0008] As a further optimization of the above technical solution, the included angle of the triangular protrusion of the locking tooth is 90-100 degrees.

[0009] As a further optimization of the above technical solution, the center line of the rectangular limit stop passes through the center of the inner gear disc, and the two side surfaces of the limit stop are parallel to the center line of the limit stop.

[0010] As a further optimization of the above technical solution, a control ring is installed on the inner gear disc, and the protruding column on the outer end surface of the locking tooth hingedly connected to the clutch disc extends into the annular groove of the control ring.

[0011] As a further optimization of the above technical solution, the axial hole on one side of the locking tooth is hingedly connected to the hinge shaft, and the outer surface on the other side is provided with a plurality of external teeth meshing with the internal teeth on the inner wall surface of the inner gear disc groove.

[0012] As a further optimization of the above technical solution, a shell is rotatably mounted on the rotating shaft, and the mounting grooves circumferentially spaced apart on the shell are snap-connected with the positioning protrusions on the inner gear disc to achieve circumferential positioning of the shell and the inner gear disc.

[0013] As a further optimization of the above technical solution, the bearing is integrally formed with two or more axial convex teeth on an annular base made of plastic material, an arc-shaped through hole that passes axially through the convex teeth is centrally arranged, and more than two tooth grooves are arranged on the central hole wall of the inner gear disk. The convex teeth of the bearing cooperate with the tooth grooves on the inner gear disk to achieve circumferential positioning, and the inner wall of the bearing cooperates with the rotating shaft for rotation.

[0014] As a further optimization of the above technical solution, the inner wall of the bearing is interference fit with the rotating shaft.

[0015] As a further optimization of the above technical solution, a spring mounting column is provided on the clutch disc, one end of the operating spring is mounted on the spring mounting column, and the other end of the operating spring is connected to the arc groove at the end of the locking tooth. The operating spring changes the direction of the elastic force as the radial and circumferential position of the locking tooth in the guide groove on the control ring changes, thereby realizing gear adjustment and switching of the free range.

[0016] The outstanding advantages of the utility model over the prior art are:

[0017] 1. The limit stopper provided on the inner side of the inner gear disc of the utility model corresponds to the positioning protrusion provided on the outer side, and the structural design is reasonable, and the strength of each other is strengthened, thereby making the structural strength of the inner gear disc good, and the strength of the inner gear disc will not be affected by the limiting of the limit stopper and the positioning of the positioning protrusion, and the service life of the inner gear disc is long.

[0018] 2. The angle of the triangular protrusion of the locking tooth of the utility model is 80-110 degrees. The angle is large, and the limiting force directly transmits torque to each other through the inner gear plate, the locking tooth, the hinge shaft on the clutch plate, the clutch plate, and the rotating shaft. The inner gear plate and the locking tooth will not be damaged by cracks due to distortion and deformation.

[0019] 3. A bearing made of plastic material is arranged between the inner gear disc and the rotating shaft of the utility model. A plurality of through holes are arranged around the bearing. The through holes are conducive to the elastic deformation of the bearing. When installed with interference fit, the shaking amount is reduced, and the impact and noise are reduced, thereby extending the service life of the inner gear disc and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0021] Figure 2 It is a three-dimensional schematic diagram of the utility model after the inner gear disc and the control ring are removed.

[0022] Figure 3 It is a schematic diagram of the structure of the limit stopper on the inner gear disc of the utility model and the engaging surface of the locking tooth cooperating to limit the position.

[0023] Figure 4 It is a three-dimensional schematic diagram of the inner gear disc of the utility model.

[0024] Figure 5 It is a three-dimensional schematic diagram of the rotating shaft of the utility model.

[0025] Figure 6 It is a three-dimensional schematic diagram of the locking tooth of the utility model. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings. Figure 1-Figure 6 :

[0027] A seat armrest rotation limiting mechanism comprises a rotating shaft 10, a clutch plate 50 fixed on the rotating shaft 10 and an inner gear plate 30, wherein the inner gear plate 30 is rotatably connected to the rotating shaft 10 via a bearing 40, wherein the outer side surface of the inner gear plate 30 is provided with two or more positioning protrusions 35 at intervals in the circumferential direction, wherein a rectangular limiting block 36 is radially extended toward the center of a circle at an inner wall surface 37 of a groove 38 centrally provided on the inner gear plate 30 corresponding to one of the positioning protrusions 35, wherein a locking tooth 60 is hingedly connected via a hinge shaft 51 provided on the clutch plate 50, wherein the inner side surface of a triangular protrusion 63 provided at one end of the locking tooth 60 has an engagement surface 64 contacting with one side surface of the limiting block 36, wherein when the engagement surface 64 of the locking tooth 60 rotates together with the rotating shaft 10 and the clutch plate 50 until it contacts with one side surface 34 of the limiting block 36, the rotation limiting of the rotating shaft 10 by the inner gear plate 30 is formed.

[0028] As a further optimization of the above technical solution, the angle A of the triangular protrusion 63 of the locking tooth 60 is 80-110 degrees.

[0029] As a further optimization of the above technical solution, the included angle of the triangular protrusion of the locking tooth 60 is 90-100 degrees, for example, 90 degrees.

[0030] As a further optimization of the above technical solution, the center line X of the rectangular limit stop 36 passes through the center of the inner gear disc 30 , and the two side surfaces 34 of the limit stop 36 are parallel to the center line X of the limit stop 36 .

[0031] As a further optimization of the above technical solution, a control ring is installed on the inner gear disc 30, and the protrusion 61 on the outer end surface of the locking tooth 60 hingedly connected to the clutch disc 50 extends into the annular groove of the control ring.

[0032] As a further optimization of the above technical solution, the axial hole 62 on one side of the locking tooth 60 is hingedly connected to the hinge shaft 51, and the outer surface on the other side is provided with a plurality of external teeth 66 that mesh with the internal teeth 33 on the inner wall surface 31 of the groove 38 of the inner gear disk 30.

[0033] As a further optimization of the above technical solution, a shell 20 is rotatably mounted on the rotating shaft 10, and the mounting grooves 21 circumferentially spaced apart on the shell 20 are snap-connected with the positioning protrusions 35 on the inner gear disk 30 to achieve circumferential positioning of the shell 20 and the inner gear disk 30.

[0034] As a further optimization of the above technical solution, the bearing 40 is integrally formed with two or more axial convex teeth 44 on an annular base 43 made of plastic material, and an axially penetrating arc-shaped through hole 41 is centrally arranged on the convex tooth 44. The hole wall of the center hole 32 of the inner gear disk 30 is provided with two or more tooth grooves 31. The convex teeth 44 of the bearing 40 cooperate with the tooth grooves 31 on the inner gear disk 30 to achieve circumferential positioning, and the inner wall of the bearing 40 cooperates with the rotating shaft 10 for rotation.

[0035] As a further optimization of the above technical solution, the inner wall 42 of the bearing 40 is interference fit with the rotating shaft 10 .

[0036] Since a bearing made of plastic material is arranged between the inner gear disc 30 and the rotating shaft 40, a plurality of through holes are arranged circumferentially of the bearing 40. The through holes are conducive to the elastic deformation of the bearing 40. In the case of interference fit installation, the elastic deformation reduces the shaking amount, impact and noise, thereby extending the service life of the inner gear disc 30 and the rotating shaft 40.

[0037] As a further optimization of the above technical solution, a spring mounting column is provided on the clutch disc 50, one end of the operating spring 70 is mounted on the spring mounting column, and the other end of the operating spring 70 is connected to the arc groove at the end of the locking tooth 60. The operating spring 70 changes the direction of the elastic force as the radial and circumferential positions of the locking tooth 60 in the guide groove on the control ring change, thereby realizing gear adjustment and switching of the free range. When the convex column 61 rotates to a certain position, the outer teeth on the locking teeth are separated from the inner teeth on the clutch disc. At other positions, the operating spring applies force to the outer teeth in the direction of meshing with the inner teeth. When the rotation stops, the outer teeth are meshed and locked with the inner teeth.

[0038] This enables the outer teeth 66 of the locking teeth 60 to mesh with or be disengaged from the inner teeth 33 on the inner gear disc 30 .

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions or technical features described in the aforementioned embodiments can still be simply replaced or modified with similar technologies, and these simple replacements or modifications do not deviate the essence of the corresponding technical solutions from the spirit and substance of the technical solutions of the embodiments of the present invention, and are still within the protection scope of the present invention.

Claims

1. A seat armrest rotation limiting mechanism, characterized in that: It includes a rotating shaft, a clutch plate fixed on the rotating shaft and an inner gear plate, the inner gear plate is rotatably connected to the rotating shaft through a bearing, and the outer side surface of the inner gear plate is circumferentially spaced with more than two positioning protrusions, and the inner wall surface of the groove centrally arranged on the inner gear plate corresponds to one of the positioning protrusions and extends radially toward the center of the circle with a rectangular limit block, and is hingedly connected with a locking tooth through a hinge shaft arranged on the clutch plate, and the inner side surface of the triangular protrusion arranged at one end of the locking tooth has a joint surface that contacts one side surface of the limit block, and when the joint surface of the locking tooth rotates together with the rotating shaft and the clutch plate until it contacts one side surface of the limit block, the rotation limit of the rotating shaft by the inner gear plate is formed.

2. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: The included angle of the triangular protrusion of the locking tooth is 80-110 degrees.

3. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: The included angle of the triangular protrusion of the locking tooth is 90-100 degrees.

4. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: The center line of the rectangular limit stopper passes through the center of the inner gear disc, and the two side surfaces of the limit stopper are parallel to the center line of the limit stopper.

5. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: A control ring is installed on the inner gear disc, and the protruding column on the outer end surface of the locking tooth hingedly connected to the clutch disc extends into the annular groove of the control ring.

6. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: The shaft hole on one side of the locking tooth is hingedly connected to the hinge shaft, and the outer side surface on the other side is provided with a plurality of outer teeth meshing with the inner teeth on the inner wall surface of the inner gear disc groove.

7. The seat armrest rotation limiting mechanism according to claim 1, characterized in that: A shell is rotatably mounted on the rotating shaft, and mounting grooves circumferentially spaced apart on the shell are snap-connected with positioning protrusions on the inner gear disc to achieve circumferential positioning of the shell and the inner gear disc.

8. A chair armrest rotation limiting mechanism according to any one of claims 1 to 7, characterized in that: The bearing is integrally formed with two or more axial convex teeth on an annular base made of plastic material, an arc-shaped through hole that passes axially through the convex teeth is centrally arranged, and more than two tooth grooves are arranged on the central hole wall of the inner gear disk. The convex teeth of the bearing cooperate with the tooth grooves on the inner gear disk to achieve circumferential positioning, and the inner wall of the bearing cooperates with the rotating shaft for rotation.

9. The seat armrest rotation limiting mechanism according to claim 8, characterized in that: The inner wall of the bearing is interference fit with the rotating shaft.

10. The seat armrest rotation limiting mechanism according to claim 8, characterized in that: A spring mounting column is provided on the clutch disc, one end of the operating spring is mounted on the spring mounting column, and the other end of the operating spring is connected to the arc groove at the end of the locking tooth. The operating spring changes the direction of the elastic force as the radial and circumferential position of the locking tooth in the guide groove on the control ring changes, thereby realizing gear adjustment and switching of the free range.

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