Rotation limiting device with self-resetting structure

Abstract

The utility model discloses a rotary limiting device with a self-resetting structure, and relates to a limiting device capable of resetting, in particular to a rotary limiting device capable of resetting. Comprising a sleeve and a rotating shaft located in the sleeve, and a plane bearing, an annular cushion block, a compression spring, a sleeve type protruding block, a limiting pin and a supporting bearing are sequentially arranged on the rotating shaft from bottom to top in the axial direction. According to the technical scheme, steering can be achieved under the action of external force, and automatic resetting can be achieved after the external force is relieved. The seat is simple in structure and reasonable in design, and brings very comfortable experience to people when being used on the seat.

Description

TECHNICAL FIELD

[0001] The utility model discloses a rotation limiting device with self-resetting structure relates to a kind of resettable limiting device, in particular to a kind of resettable rotation limiting device. BACKGROUND

[0002] Ordinary people use office chair mostly chair frame can rotate chair, user sits on chair and relies on own contortion, and chair frame can be rotated to left or right, and it is still necessary to rely on own contortion to realize reset after turning. UTILITY MODEL CONTENTS

[0003] The utility model discloses a rotation limiting device with self-resetting structure, which can realize turning when subjected to external force and can realize automatic reset after the external force is removed.

[0004] The utility model discloses a rotation limiting device with self-resetting structure, including sleeve and the pivot in the sleeve, its characterized in that the pivot is equipped with plane bearing, annular cushion block, compression spring, sleeve type lug, limit pin, support bearing in turn from below to top along the axial direction on the pivot, the plane bearing is set on the pivot through the step on the pivot, the annular cushion block is set on the pivot and is located on the plane bearing, the compression spring is set on the pivot, and its lower end part is in contact with the plane bearing, and its upper end part is in contact with the lower bottom surface of the sleeve type lug, the sleeve type lug is set on the pivot, and the upper end surface is inclined truncated surface, a plurality of pits are formed on the outer surface of the sleeve type lug, the limit pin is fixed on the pivot and is set on the upper end surface of the sleeve type lug, the support bearing is fixed on the upper end edge of the pivot, the sleeve is circular platform sleeve, the inner cavity of the sleeve is narrow at top and wide at bottom, a plurality of grooves are formed on the surface of the inner cavity of the sleeve, the design position of the plurality of grooves corresponds to the plurality of pits on the outer surface of the sleeve type lug, a plurality of balls are arranged in the plurality of pits, and the plurality of balls are located between the pit and the groove, so that there is gap between the outer surface of the sleeve type lug and the surface of the inner cavity of the sleeve, the support bearing fixed on the end of the pivot cooperates with the opening on the sleeve, the annular cushion block on the pivot cooperates with the lower opening of the sleeve, so that the pivot and the sleeve can rotate relatively.

[0005] The rotation limiting device with self-resetting structure has a stop block at the highest part of the inclined truncated surface of the sleeve type lug.

[0006] The rotation limiting device with self-resetting structure has a pin hole on the pivot, and the limit pin is fixed on the pivot in interference fit with the pin hole, and the end of the limit pin protrudes from the pivot and is set on the inclined truncated surface of the sleeve type lug.

[0007] The rotating limiting device with self-resetting structure has an upper bearing supporting step surface provided with a support bearing at an upper opening of the sleeve, and a lower bearing supporting step surface provided with an annular pad at a lower opening of the sleeve; an upper fixed step surface provided with a support bearing at an upper end edge of the rotating shaft, and a lower fixed step surface provided with an annular pad at the rotating shaft.

[0008] Compared with the prior art, the technical scheme of the utility model can realize steering when the device is subjected to external force and can realize automatic reset after the external force is removed. The structure is simple and reasonable in design, and can bring very comfortable experience to people when used for a seat. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is the appearance schematic view of the rotating limiting device with self-resetting structure.

[0010] Figure 2 is the exploded view of the rotating limiting device with self-resetting structure.

[0011] Figure 3 is the position relation diagram of the components of the rotating limiting device with self-resetting structure without the sleeve.

[0012] Figure 4 is the front view of the sleeve of the rotating limiting device with self-resetting structure.

[0013] Figure 5 is Figure 4 the A-A sectional view. DETAILED DESCRIPTION

[0014] The technical scheme of the utility model will be further described in detail in combination with the embodiments and the drawings.

[0015] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The utility model discloses a rotation limiting device of self-resetting structure, which comprises a sleeve and a rotating shaft in the sleeve. A plane bearing, an annular pad, a compression spring, a sleeve type lug, a limiting pin, a supporting bearing, a gasket and a screw are sequentially arranged on the rotating shaft in the axial direction from bottom to top. The plane bearing is clamped on the rotating shaft through a first step on the rotating shaft. The annular pad is sleeved on a second step of the rotating shaft and placed on the plane bearing. The compression spring is sleeved on the rotating shaft, and the lower end of the compression spring is in contact with the annular pad. The upper end of the compression spring is in contact with the lower bottom surface of the sleeve type lug. The sleeve type lug is sleeved on the rotating shaft, and the upper end surface of the sleeve type lug is an inclined truncated surface. A plurality of pits are arranged on the outer surface of the sleeve type lug. The limiting pin is fixed on a pin hole on the rotating shaft in an interference fit, and the end of the limiting pin protrudes from the rotating shaft and is clamped on the upper end surface of the sleeve type lug. The supporting bearing is fixed on the third step surface of the upper end of the rotating shaft. The sleeve is a circular truncated sleeve, and the inner cavity of the sleeve is narrow at the top and wide at the bottom. A plurality of grooves are arranged on the surface of the inner cavity of the sleeve, and the design positions of the grooves correspond to the pits on the outer surface of the sleeve type lug. A plurality of balls are arranged in the pits, and the balls are located between the pits and the grooves. In order to ensure the stable working state of the sleeve type lug, the number of the pits and the grooves is more than three and is symmetrically distributed. The supporting bearing at the end of the rotating shaft is tightly matched with the upper opening of the sleeve, and the annular pad on the rotating shaft is tightly matched with the lower opening of the sleeve, so that the rotating shaft and the sleeve can rotate relative to each other. The gasket and the screw are used for fixing the supporting bearing.Thus, the end of the limiting pin 25 is clamped on the upper end surface 242 of the sleeve type protrusion 24 in the normal state of the self-resetting structure rotation limiting device, and the position is at the lowest part of the inclined surface, at this time, the rotation of the rotating shaft 2 relative to the sleeve 1 is driven by external force, because the upper cavity 11 of the sleeve is thin at the top and thick at the bottom, the sleeve type protrusion 24 is clamped in the upper cavity 11 of the sleeve by the ball 3 and cannot move, therefore, the end of the limiting pin 25 will slide along the upper end surface 242 of the protrusion under the driving of the rotating shaft 2, because the upper end surface 242 of the protrusion is an inclined surface, the rotating shaft 2 will gradually rise in the rotating process, and the compression spring 23 is compressed, at this time, the external force is eliminated, because of the action of the compression spring 23, the limiting pin 25 will slide down along the upper end surface 242 of the protrusion until it slides to the lowest part of the upper end surface 242 of the protrusion, and returns to the original position.

[0016] Further, the highest part of the inclined section of the upper end surface 242 of the protrusion is provided with a limiting block 2421 for limiting the stroke of the limiting pin 25, the upper opening 13 of the sleeve 1 is provided with an upper bearing step surface 131 for supporting the bearing 26, the lower opening 12 of the sleeve 1 is provided with a lower bearing step surface 121 for supporting the annular pad 22, the upper end edge of the rotating shaft 2 is provided with an upper fixed step surface 2D for supporting the bearing 26, and the rotating shaft 2 is further provided with a lower fixed step surface 2B for supporting the annular pad 22, so that the rotating shaft 2, the annular pad 22, the bearing 26 and the sleeve 1 can be more closely matched, and the working state is more stable.

[0017] The preferred embodiments of the utility model are described above, it should be pointed out that, for ordinary skilled person in the art, without departing from the creative concept of the utility model, a number of deformations and improvements can be made, these all belong to the protection scope of the utility model.

[0018] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the utility model.

Claims

1. A rotation limiting device with self-resetting structure, comprising a sleeve and a rotating shaft located in the sleeve, characterized in that: a planar bearing, an annular pad, a compression spring, a sleeve-type protrusion, a limiting pin and a support bearing are sequentially arranged on the rotating shaft in an axial direction from bottom to top; the planar bearing is clamped on the rotating shaft through a step on the rotating shaft; the annular pad is sleeved on the rotating shaft and placed on the planar bearing, and 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 with its upper end surface being an inclined truncated surface, and a plurality of recesses are arranged on the outer surface of the sleeve-type protrusion; the limiting pin is fixed on the rotating shaft and clamped on the upper end surface of the sleeve-type protrusion; and the support bearing is fixed on the upper end edge of the rotating shaft. The sleeve is a circular truncated cone sleeve with a smaller inner diameter at the top and a larger inner diameter at the bottom, and a plurality of grooves are arranged on the surface of the inner cavity of the sleeve, the design positions of the grooves corresponding to the plurality of recesses on the outer surface of the sleeve-type protrusion; a plurality of balls are arranged in the recesses, and the plurality of balls are located between the recesses and the grooves, so that there is a gap between the outer surface of the sleeve-type protrusion and the surface of the inner cavity of the sleeve. The support bearing fixed on the end of the rotating shaft cooperates with the opening on the sleeve, and the annular pad on the rotating shaft cooperates with the lower opening of the sleeve, so that the rotating shaft and the sleeve can rotate relative to each other. A stop block is arranged at the highest position of the inclined truncated surface of the sleeve-type protrusion.

2. The rotation limiting device with self-resetting structure according to claim 1, wherein A pin hole is arranged on the rotating shaft, and the limiting pin is fixed on the rotating shaft in interference fit with the pin hole; the end of the limiting pin protrudes from the rotating shaft and is clamped on the inclined truncated surface of the sleeve-type protrusion.

3. The rotational position limiting device with self-resetting structure according to claim 1 or 2, characterized in that An upper bearing step surface of the support bearing is arranged on the opening of the sleeve, and a lower bearing step surface of the annular pad is arranged on the lower opening of the sleeve; an upper fixed step surface of the support bearing is arranged on the upper end edge of the rotating shaft, and a lower fixed step surface of the annular pad is arranged on the rotating shaft.

4. The rotational position limiting device with self-resetting structure according to claim 3, characterized in that ​

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