TWI724535B - Positioning casters - Google Patents

Abstract

A positioning caster includes a base, a shaft tube, a positioning block, and two roller units. The base includes an inner ring surface defining a laterally penetrating shaft hole, and the base is also provided with a positioning groove extending along the tangential direction of the inner ring surface and communicating with the shaft hole; the shaft tube passes through the shaft hole, It also includes a fixed section connected to the inner ring wall, and two axially opposite side connecting sections exposed outside the base. The outer peripheral surface of the fixed section is recessed with a groove corresponding to the positioning groove; the positioning The block penetrates the positioning groove and is partially embedded in the groove, so that the shaft tube is axially positioned in the shaft hole; the roller units are respectively sleeved on the side connecting sections rotatably. With this structural design, the positioning caster presents a hollow appearance.

Description

Positioning casters

The present invention relates to a caster, especially a hollow positioning caster.

The existing positioning caster includes a wheel base and a roller pivotally connected to the wheel base. Since the axis of the roller needs to be pivotally connected to the wheel base, it cannot be designed as a hollow caster. Chinese patent CN100441428C discloses a positioning caster with a hollow appearance, comprising a hollow seat body, a sleeve passing through the seat body and having two cylindrical parts, and two rotatably arranged on the sleeve. The wheels of the cylindrical part of the barrel. In order to ensure that the sleeve does not move or rotate left and right relative to the seat body, the outer circumferential surface of the sleeve is provided with a ring-shaped groove and two tangent planes, and the inner circumferential surface of the seat body is provided with an insertable The ring-shaped ridge of the groove and two flat surfaces respectively corresponding to the aforementioned tangent plane. The groove and the ring-shaped ridge restrict the sleeve from being able to move horizontally relative to the seat body. The isometric plane and the flat surfaces restrict the sleeve from rotating relative to the seat body.

Although the aforementioned positioning casters can have a hollow appearance, since the sleeve and the seat body are interlocked with each other by the groove and the ring-shaped ridge, the ring-shaped ridge and the sleeve are forced to be slightly elastically deformed during assembly. , So that the sleeve passes through the seat body from its axial direction. This structure is not only unfavorable for assembly, and in order to smoothly assemble the sleeve in the seat body, the material of the sleeve and the seat body must be With proper elasticity, the strength of the positioning caster is greatly reduced.

The purpose of the present invention is to provide a positioning caster that can overcome at least one of the disadvantages of the prior art.

Therefore, the positioning caster of the present invention includes a base, a shaft tube, a positioning block, and two roller units. The base includes an inner ring surface defining a laterally penetrating shaft hole, and the base is also provided with a positioning groove extending along the tangential direction of the inner ring surface and communicating with the shaft hole; the shaft tube passes through the shaft hole, And includes a fixed section connected to the inner ring wall, and two side sections respectively connected to the two opposite sides of the fixed section in the axial direction and exposed outside the base. The outer peripheral surface of the fixed section is recessed with a corresponding The groove of the positioning groove; the positioning block penetrates the positioning groove and is partially embedded in the groove, so that the shaft tube is positioned transversely in the shaft hole; the roller units are rotatably sleeved on the sides, respectively Continue paragraph.

The effect of the present invention is that the positioning block penetrates the positioning groove and is partially embedded in the groove, so that the shaft tube cannot be displaced left or right relative to the base or rotatably penetrates the base. The shaft tube is not connected to the base by means of concave-convex elastic inserting, which can improve the convenience of assembling the shaft tube and the base.

1 to 4, an embodiment of the positioning caster of the present invention includes a base 1, a shaft tube 2, a positioning block 3, two roller units 4, a braking unit 5, and a mounting seat 6.

The base 1 includes an inner ring surface 11 defining a laterally penetrating shaft hole 101, an outer ring surface 12 radially opposite to the inner ring surface 11, and two connected to the inner ring surface 11 and the inner ring surface 11, respectively. The side surface 13 between the two opposite sides in the axial direction of the outer ring surface 12. The inner ring surface 11 has a longitudinally extending and planar plane section 111, and an annular section 112 connecting the upper and lower sides of the plane section 111 and defining the shaft hole 101 together with the plane section 111. The base 1 is also provided with a positioning groove 102 extending from the bottom side of the outer ring surface 12 upward along the tangential direction of the ring surface section 112 through the ring surface section 112 to partially communicate with the shaft hole 101, and a positioning groove 102 connected with the shaft hole 101. The positioning grooves 102 extend upwardly from the bottom side of the outer ring surface 12 at intervals and penetrate through the screw holes 103 communicating with the shaft hole 101.

The shaft tube 2 passes through the shaft hole 101, and includes a fixed section 21 connected to the inner ring surface 11, and two are respectively connected to opposite sides of the fixed section 21 in the axial direction and are exposed on the base 1 External side section 22. The fixing section 21 has a flat surface 212 which is in a plane shape and abuts against the flat section 111 and a groove 211 recessed on the outer peripheral surface and corresponding to the positioning groove 102.

The positioning block 3 is in the form of a cylinder, penetrates upwardly in the positioning groove 102 and partially protrudes from the connecting portion of the positioning groove 102 and the shaft hole 101 inwardly of the annular section 112, and is embedded in the shaft In the groove 211 of the tube 2.

Referring to Figures 2, 5 and 6, the roller units 4 are respectively rotatably sleeved on the side connecting sections 22, and each roller unit 4 includes a rim rotatably sleeved on the respective side connecting section 22 42, and a bearing 41 disposed between the rim 42 and the corresponding side connecting section 22. The rim 42 has a brake ring portion 421 that protrudes toward the base 1 over the bearing 41.

The brake unit 5 includes two brake components 51 extending laterally outward from the side surfaces 13 and used to abut the brake ring portions 421 upward respectively, and one elastic component disposed between the base 1 and the shaft tube 2 A piece 52, and a switch piece 53 screwed up on the screw hole 103 and pushed up the fixing portion 22 in the past. The elastic member 52 is elastically supported up and down between the base 1 and the shaft tube 2, and will constantly drive the shaft tube 2 to drive the rims 42 to move down relative to the base 1, so that the brake ring portions 421 Lean against the brake parts 51 downward respectively.

The base 1 can move up and down in a rotational position and a rotational position relative to the shaft tube 2. When the base 1 is in the rotational position (refer to FIG. 5), the brake components 51 abut against the The brake ring portion 421 restricts the rotation of the wheels 42 relative to the shaft tube 2. When the base 1 is subjected to a downward external force to overcome the elastic force of the elastic member 52 provided between the base 1 and the shaft tube 2, the base 1 will move downward from the rotation limit position to the rotation Position (see FIG. 6). At this time, the brake members 51 are downwardly separated from the brake ring portions 421, so that the rims 42 can rotate relative to the shaft tube 2, and the elastic member 52 is compressed and accumulated An elastic restoring force. When the external force is removed, the elastic member 52 releases the elastic restoring force to make the base 1 return upward to the rotation limit position.

In conjunction with FIG. 7, the switching member 53 is screwed into the screw hole 103 of the base 1 and abuts against the outer peripheral surface of the fixed section 21 radially upward. The switching member 53 is located directly below the elastic member 52, and can be rotated and moved to push the fixed section 22 upward relative to the base 1, so that the fixed section 22 overcomes the elastic force of the elastic member 52 and opposes the base 1. Move up and disengage the brake ring surfaces 421 from the brake parts 51, so that the base 1 is displaced to the rotating position.

The mounting base 6 is connected to the outer ring surface 12 of the base 1 and is used for mounting on a piece of furniture (not shown). Because there are many types of the mounting base 6 for mounting on the furniture, and the mounting base 6 is not The creation of the present invention is focused, so the description is omitted here.

When assembling the positioning caster of the present invention, the mounting seat 6 is integrally connected to the base 1, and the shaft tube 2 is inserted into the shaft hole 101, so that the fixed section 21 is aligned with the inner surface with the rotation stop plane 212 The plane section 111 of the ring surface 11 is received in the shaft hole 101 so that the side connecting sections 22 protrude from the base 1 respectively. Then, the positioning block 3 is inserted and fixed in the positioning groove 102, and the shaft tube 2 cannot axially move and rotate left and right relative to the base 1. Finally, the roller units 4 are respectively sleeved on the Wait for the side connecting section 22 to complete the assembly of the entire positioning caster.

It should be particularly noted that the shaft tube 2 is fixed by the positioning block 3 through the positioning groove 102 and the groove 211, and the plane section 111 and the rotation stop plane 212 are abutted against each other and cannot be shafted. The axial displacement and rotation are positioned in the shaft hole 101, but in practice, the plane section 111 and the rotation-stopping plane 212 are not necessary, and will not affect the positioning of the shaft tube 2 and the base 1.

In use, the positioning caster of the present invention is installed on the bottom of the furniture through the mounting base 6, such as but not limited to the seat foot pole. The user can first screw and shift the switch 53 downward or upward. It is adjusted whether the switching member 53 supports the fixed section 22 to compress the elastic member 52. When the switching member 53 is adjusted to support the fixed section 22 and the fixed section 22 is linked to compress the elastic member 52, the base 1 will remain in the rotating position, so the positioning caster does not have the braking function.

When the switching member 53 is adjusted to not support the fixed section 22, the upper and lower elastic support elasticity of the elastic member 52 is designed to be sufficient to support the weight of the furniture, so when the furniture does not carry other heavy objects, the elastic member 52 will keep the base 1 at the rotation limit position. When the furniture bears a heavy object, the weight of the heavy object is transmitted to the base 1 through the mounting seat 6, so that the base 1 moves down to the rotation position relative to the shaft tube 2, and compresses the elastic member 52, The roller unit 4 can rotate relative to the shaft tube 2. For example, the furniture is a seat. When the user sits on the seat, the base 1 will move to the rotating position. The user can slide the seat through the roller units 4, and when the user sits on the seat, When getting up and leaving the seat, the base 1 moves up to the restricted rotation position, so that the seat cannot be displaced through the roller units 4.

It should be added that the brake unit 5 and the brake ring portion 421 are not necessary in implementation. If the positioning caster is not provided with the brake unit 5, the roller units 4 can always rotate relative to the shaft tube 2 without The function of braking.

In summary, the effect of the positioning caster of the present invention is that the groove 211 and the positioning groove 102 can be positioned by the positioning block 3, so that the shaft tube 2 cannot be displaced and rotated left and right relative to the base 1. Instead of the existing hollow positioning casters, the shaft tube 2 and the base 1 are positioned with each other by the deformation of elastic material. Not only is it convenient to assemble, the shaft tube 2 and the base 1 can also be made of non-elastic materials to increase the strength Therefore, the objective of the present invention can indeed be achieved.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

1········ Pedestal 101····· Axle hole 102····· Positioning slot 103····· Screw Hole 11·······Inner ring surface 111····· plane section 112····· Torus segment 12······· Outer Ring Surface 13······· Side 2········ Axle tube 21·······Fixed segment 211····· Groove 212····· Stopping plane 22······· Side section 3········ Positioning block 4········ Roller unit 41······· Bearing 42·······Rim 421····· Brake Ring 5········Brake unit 51······· Brake Parts 52······· Elastic Parts 53······· Switch 6········ Mounting seat

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view of an embodiment of the present invention; Figure 2 is a perspective exploded view of the embodiment; Figure 3 is a side cross-sectional view of the embodiment; Figure 4 is a top sectional view of the embodiment; FIG. 5 is a side cross-sectional view from another perspective of the embodiment, illustrating a base in a rotation-limiting position; Figure 6 is a view similar to Figure 5, illustrating the base in a rotated position; and Fig. 7 is a view similar to Fig. 5, illustrating that a switch member is adjusted to prop up a shaft tube upwards, so that the base is in a rotating position.

1········ Pedestal 101····· Axle hole 102····· Positioning slot 103····· Screw Hole 11·······Inner ring surface 111····· plane section 112····· Torus segment 12······· Outer Ring Surface 13······· Side 2········ Axle tube 21·······Fixed segment 211····· Groove 212····· Stopping plane 22······· Side section 3········ Positioning block 4········ Roller unit 41······· Bearing 42·······Rim 5········Brake unit 51······· Brake Parts 52······· Elastic Parts 53······· Switch 6········ Mounting seat

Claims (4)

A positioning caster includes: a base, including an inner ring surface defining a laterally penetrating shaft hole, an outer ring surface radially opposite to the inner ring surface, and two connected to the inner ring surface and On the side surface between the two opposite axial sides of the outer ring surface, the base is also provided with a positioning groove extending vertically and vertically from the outer ring surface along the tangent direction of the inner ring surface and communicating with the shaft hole; Displacement and up-and-down displacement pass through the shaft hole, including a fixed section abutting against the inner ring surface, and two side joints respectively connected to opposite sides of the fixed section in the axial direction and exposed outside the base Section, the outer peripheral surface of the fixed section is recessed with a groove extending up and down and corresponding to the positioning groove; a braking unit, including two braking parts extending laterally outward from the sides, and upper and lower elastic top supports on the base An elastic piece and a switching piece between the outer circumferential surface of the shaft tube, and the elastic piece and the switching piece are respectively abutted on the two radially opposite sides of the outer circumferential surface of the fixed section; a positioning block extends up and down through Is arranged in the positioning groove and partially embedded in the groove, so that the shaft tube is positioned transversely in the shaft hole; and two roller units are rotatably sleeved on the side connecting sections, and each roller unit has A brake ring portion that can be abutted by the corresponding brake component; the base can be positioned relative to the axle tube at a limit rotation position where the brake components are respectively abutted against the brake ring portion, and a brake Displacement up and down between the rotational positions separated from the brake ring portions, the elastic member always has an elastic force to elastically push the base toward the rotation-limiting position, and the switching member can rotate and shift toward the fixed section relative to the base , And drive the displacement of the base to be positioned at the rotational position. The positioning caster according to claim 1, wherein the inner ring surface of the base has a longitudinally extending flat plane section, and the fixed section further has a plane shape and abutting against the plane section Stop plane. The positioning caster according to claim 1, wherein each roller unit includes a rim sleeved on the respective side connecting section, and a bearing arranged between the corresponding rim and the corresponding side connecting section, Each brake ring portion is arranged at a position where the corresponding rim protrudes axially from the corresponding bearing toward the base. The positioning caster according to claim 1, wherein each roller unit includes a rim sleeved on the respective side connecting section, and a bearing arranged between the corresponding rim and the corresponding side connecting section.

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