Rotary position-limiting device with self-resetting structure
By designing a rotation limit device with a self-resetting structure, and utilizing the combination of compression springs and limit pins, the problem of manual return required for existing office chairs has been solved, achieving automatic reset function and improving user comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 张久智
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-23
AI Technical Summary
The existing office chairs' rotation limit devices require the user to manually twist them to return to their original position, lacking an automatic reset function, which makes them inconvenient to use.
A rotary limiting device with a self-resetting structure was designed, including components such as a sleeve, a rotating shaft, a plane bearing, an annular pad, a compression spring, a sleeve-type protrusion, a limiting pin, and a support bearing. By utilizing the cooperation of the compression spring and the limiting pin, the device can automatically reset after being rotated by external force.
It enables steering under external force and automatic reset after the external force is removed. The structure is simple and improves user comfort.
Smart Images
Figure CN122250757A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a reversible limiting device, and more particularly to a reversible rotary limiting device. Background Technology
[0002] Most office chairs that people usually use are chairs with swivel frames. When a user sits on the chair, they can turn the chair frame to the left or right by twisting it themselves. After turning, they still need to twist it themselves to return to the original position. Summary of the Invention
[0003] The purpose of this invention is to provide a rotation limiting device with a self-resetting structure, which can rotate when subjected to external force and automatically reset after the external force is released.
[0004] This invention discloses a rotary limiting device with a self-resetting structure, comprising a sleeve and a rotating shaft located within the sleeve. The rotating shaft is characterized by the following components arranged axially from bottom to top: a planar bearing, an annular pad, a compression spring, a sleeve-type protrusion, a limiting pin, and a support bearing. The planar bearing is secured to the rotating shaft via a step. The annular pad is sleeved on the rotating shaft and rests on the planar bearing. The compression spring is sleeved on the rotating shaft, with its lower end abutting against the planar bearing and its upper end abutting against the lower bottom surface of the sleeve-type protrusion. The sleeve-type protrusion is sleeved on the rotating shaft, its upper end face being an inclined cross-section, and several recesses are provided on the outer surface of the sleeve-type protrusion. The limiting pin... The support bearing is fixed to the upper end face of the sleeve-type protrusion and fixed to the rotating shaft; the sleeve is a frustum-shaped sleeve with a narrower upper cavity and a wider lower cavity. Several grooves are provided on the surface of the inner cavity of the sleeve, and the design positions of these grooves correspond to several pits on the outer surface of the sleeve-type protrusion; ball bearings are provided in these pits, and these ball bearings are located between the pits and the grooves, so that there is a gap between the outer surface of the sleeve-type protrusion and the inner surface of the sleeve; the support bearing fixed to the end of the rotating shaft is engaged with the upper opening of the sleeve, and the annular pad located on the rotating shaft is engaged with the lower opening of the sleeve, so that the rotating shaft and the sleeve can rotate relative to each other.
[0005] The aforementioned rotational limiting device with a self-resetting structure has a stop block at the highest point of the inclined cross-section of the sleeve-type protrusion.
[0006] The aforementioned rotary limiting device with a self-resetting structure has a pin hole on the rotating shaft, and the limiting pin is fixed to the rotating shaft with an interference fit with the pin hole; the end of the limiting pin protrudes from the rotating shaft and is engaged with the inclined cross-section of the sleeve-type protrusion.
[0007] The aforementioned rotation limiting device with a self-resetting structure has an upper bearing step surface with a support bearing on the sleeve and a lower bearing step surface with an annular pad on the lower opening of the sleeve; an upper fixed step surface with a support bearing is provided on the upper edge of the rotating shaft, and a lower fixed step surface with an annular pad is also provided on the rotating shaft.
[0008] Compared with existing technologies, the device of this invention can steer when subjected to external force and automatically reset after the external force is removed. It has a simple structure and reasonable design, providing a very comfortable experience when used in seating. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the external appearance of the rotation limiting device with self-resetting structure of the present invention.
[0010] Figure 2 This is an exploded view of the rotation limiting device with a self-resetting structure of the present invention.
[0011] Figure 3 This is a diagram showing the positional relationship of each component of the self-resetting rotating limiting device of the present invention without the sleeve.
[0012] Figure 4 This is a front view of the sleeve of the rotation limiting device of the self-resetting structure of the present invention.
[0013] Figure 5 yes Figure 4 The AA section view is shown. Detailed Implementation
[0014] The technical solution of the present invention will be further described in detail below with reference to the embodiments and accompanying drawings.
[0015] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The diagram shows an embodiment of the rotation limiting device with a self-resetting structure according to the present invention. It includes a sleeve 1 and a rotating shaft 2 located within the sleeve 1. Along the axial direction from bottom to top, the rotating shaft 2 is provided with a planar bearing 21, an annular pad 22, a compression spring 23, a sleeve-type protrusion 24, a limiting pin 25, a support bearing 26, a washer 27, and a screw 28. The planar bearing 21 is engaged with the rotating shaft 2 via a first step 2A. The annular pad 22 is sleeved on the second step 2B of the rotating shaft 2 and placed on the planar bearing 21. The compression spring 23 is sleeved on the rotating shaft, with its lower end 231 abutting against the annular pad 22. The upper end 232 of the compression spring 23 abuts against the lower bottom surface 241 of the sleeve-type protrusion 24. The sleeve-type protrusion 24 is sleeved on the... On the rotating shaft 2, the upper end face 242 of the protrusion is an inclined cross-section, and several pits 243 are provided on the outer surface of the sleeve-type protrusion 24; the limiting pin 25 is interference-fitted and fixed to the pin hole 2C on the rotating shaft 2, and the end of the limiting pin 25 protrudes from the rotating shaft 2 and is locked on the upper end face 242 of the sleeve-type protrusion 24, which is an inclined cross-section; the support bearing 26 is fixed on the third step surface 2D at the upper edge of the rotating shaft 2. The sleeve 1 is a frustum-shaped sleeve with a narrower upper cavity 11 and a wider lower cavity. Several grooves 111 are provided on the surface of the sleeve cavity 11, and the design positions of these grooves 111 correspond to several pits 243 on the outer surface of the sleeve-type protrusion 24. Roller balls 3 are provided in the pits 243 and are located between the pits 243 and the grooves 111. That is, if there are three grooves on the surface of the sleeve cavity 11, there are three corresponding pits on the outer surface of the sleeve-type protrusion 24, and three roller balls are located in the three pits. In this way, there is a gap between the outer surface of the sleeve-type protrusion 24 and the surface of the sleeve cavity 11. In order to ensure that the sleeve-type protrusion 24 is subjected to uniform force in the sleeve cavity 11 and to ensure its stable working state, there are preferably more than three pits 243 and grooves 111, which are symmetrically distributed. The support bearing 26 fixed to the end of the rotating shaft is tightly fitted with the upper opening 13 of the sleeve, and the annular pad 22 located on the rotating shaft is tightly fitted with the lower opening 12 of the sleeve, so that the rotating shaft 2 and the sleeve 1 can rotate relative to each other. The washer 27 and the screw 28 are used to fix and limit the support bearing 26.Thus, in the normal state of the self-resetting rotating limiting device of the present invention, the end of the limiting pin 25 is engaged on the upper end face 242 of the sleeve-type protrusion 24, and its position is at the lowest point of the inclined surface. At this time, when an external force is applied to make the rotating shaft 2 rotate relative to the sleeve 1, since the inner cavity 11 of the sleeve is narrower at the top and wider at the bottom, the sleeve-type protrusion 24 is stuck in the inner cavity 11 of the sleeve by the ball 3 and cannot move. Therefore, under the drive of the rotating shaft 2, the end of the limiting pin 25 will slide along the upper end face 242 of the protrusion. Since the upper end face 242 of the protrusion is an inclined surface, the rotating shaft 2 will gradually rise during the rotation, and the compression spring 23 will be compressed. At this time, the applied external force is eliminated. Due to the action of the compression spring 23, the limiting pin 25 will slide down along the upper end face 242 of the protrusion until it slides to the lowest point of the upper end face 242 of the protrusion and return to its original position.
[0016] Furthermore, a stop block 2421 is provided at the highest point of the inclined cross-section of the upper end face 242 of the protrusion, which is used to limit the stroke of the limiting pin 25. An upper bearing step 131 for the support bearing 26 is provided at the upper opening 13 of the sleeve 1, and a lower bearing step 121 for the annular pad 22 is provided at the lower opening 12 of the sleeve 1. An upper fixed step 2D for the support bearing 26 is provided at the upper edge of the rotating shaft 2, and a lower fixed step 2B for the annular pad 22 is also provided on the rotating shaft 2. This allows for a tighter fit between the rotating shaft 2, the annular pad 22, the support bearing 26, and the sleeve 1, resulting in a more stable working condition.
[0017] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.
[0018] In the description of this 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
Claims
1. A rotation limiting device with a self-resetting structure, comprising a sleeve and a rotating shaft located within the sleeve, characterized in that: Along the axial direction from bottom to top, the rotating shaft is provided with a planar bearing, an annular pad, a compression spring, a sleeve-type protrusion, a limiting pin, and a support bearing. The planar bearing is secured to the rotating shaft via a step. The annular pad is sleeved on the rotating shaft and placed on the planar bearing. The compression spring is sleeved on the rotating shaft, with its lower end abutting against the planar bearing and its upper end abutting against the lower bottom surface of the sleeve-type protrusion. The sleeve-type protrusion is sleeved on the rotating shaft, and its upper end face is an inclined cross-section with several recesses on its outer surface. The limiting pin is fixed to the rotating shaft and secured to the upper end face of the sleeve-type protrusion. The support bearing is fixed to the upper edge of the rotating shaft. The sleeve is a frustum-shaped sleeve with a narrower upper cavity and a wider lower cavity. Several grooves are provided on the surface of the inner cavity of the sleeve, and the design positions of these grooves correspond to several pits on the outer surface of the sleeve-shaped protrusion. Ball bearings are provided in these pits and are located between the pits and grooves, so that there is a gap between the outer surface of the sleeve-shaped protrusion and the surface of the inner cavity of the sleeve. The support bearing fixed to the end of the rotating shaft engages with the opening on the sleeve, and the annular pad located on the rotating shaft engages with the opening on the lower part of the sleeve, allowing the rotating shaft and the sleeve to rotate relative to each other.
2. The rotation limiting device with a self-resetting structure according to claim 1, characterized in that... A stop block is provided at the highest point of the inclined cross-section of the sleeve-type protrusion.
3. The rotation limiting device with a self-resetting structure according to claim 1 or 2, characterized in that... A pin hole is provided on the rotating shaft, and the limiting pin is fixed to the rotating shaft with an interference fit to the pin hole; the end of the limiting pin protrudes from the rotating shaft and is engaged with the inclined cross-section of the sleeve-type protrusion.
4. The rotation limiting device with a self-resetting structure according to claim 3, characterized in that... The sleeve has an upper bearing step with an opening for supporting the bearing, and the sleeve has a lower bearing step with an annular pad at the bottom opening; the upper end edge of the rotating shaft has an upper fixing step for supporting the bearing, and the rotating shaft also has a lower fixing step for an annular pad.