CASTER WITH BRAKING DEVICE

• US 20190308450A1
• Filed: 11/29/2017
• Published: 10/10/2019
• Est. Priority Date: 11/30/2016
• Status: Active Grant

• Current Assignee: Gross + Froelich GmbH & Co.
• Original Assignee: Gross + Froelich GmbH & Co. KG
• Inventors: ROTTENAU, Hans-Wilhelm, VON BORDELIUS, Ralph
• Granted Patent: US 11,052,704 B2
• Time in Patent Office: Days
• CPC Class Codes: B60B 2200/222 Office chairs
• CPC Class Codes: B60B 2360/10 Metallic materials
• CPC Class Codes: B60B 2360/102 Steel
• CPC Class Codes: B60B 2360/32 Plastic compositions
• CPC Class Codes: B60B 2360/322 Comprising polypropylene
• CPC Class Codes: B60B 2360/341 with fibres
• CPC Class Codes: B60B 2900/112 Costs
• CPC Class Codes: B60B 2900/321 Lifetime
• CPC Class Codes: B60B 2900/325 Reliability
• CPC Class Codes: B60B 33/0042 Double or twin wheels
• CPC Class Codes: B60B 33/0049 the rolling axle being horizontal
• CPC Class Codes: B60B 33/0057 the rolling axle being offset from swivel axis
• CPC Class Codes: B60B 33/0068 the swivel axis being vertical
• CPC Class Codes: B60B 33/0073 the swivel axis being symmetrical to wheel or wheels
• CPC Class Codes: B60B 33/0078 characterised by details of the wheel braking mechanism
• CPC Class Codes: B60B 33/0084 acting on axle end
• CPC Class Codes: B60B 33/0094 actuated automatically

Abstract

The present disclosure relates to a caster, having a housing, having an axle pin which is arranged in a housing opening which is oriented substantially horizontally, and on which at least one wheel is mounted, having, at the top, a pin opening oriented substantially vertically, for receiving a pivot pin, and having a braking device which brakes the at least one wheel, wherein the housing opening for the axle pin allows limited vertical displaceability of the axle pin and the braking device comprises at least one resilient housing part which acts on the axle pin. In order to provide a mechanically reliable braking device, the braking device is additionally provided with at least one spring element which cooperates with the at least one resilient housing part and amplifies the effect of its braking force and/or increases the mechanical load-bearing capacity of the at least one resilient housing part.

Claims

1. A caster, having a housing, having an axle pin which is arranged in a housing opening oriented substantially horizontally, and on which at least one wheel is mounted, having, at the top, a pin opening oriented substantially vertically, for accommodating a pivot pin, and having a braking device which brakes the at least one wheel in a first load state and releases it in a second load state, wherein the housing opening for the axle pin allows a limited ability of the axle pin to be displaced vertically, and the braking device comprises at least one resilient housing portion which acts on the axle pin, wherein the braking device further comprises at least one spring element which works together with the at least one resilient housing portion to enhances the braking force thereof.

2. The caster according to claim 1, wherein the housing, or at least the at least one resilient housing portion, is made of a plastic—

in particular, polypropylene or polyamide.

3. The caster according to claim 1, wherein the at least one spring element is made of a material having a higher mechanical load capacity than that of the at least one resilient housing portion.

4. The caster according to claim 2, wherein the at least one spring element is designed as a leaf spring which is embedded in the material of the at least one resilient housing portion.

5. The caster according to claim 1, wherein the housing has at least one wall portion which projects laterally beyond the housing opening for the axle pin, and which a hub of the at least one wheel engages with a force fit and/or a positive fit in the first, braking load state of the caster.

6. The caster according to claim 1, wherein the at least one resilient housing portion is created by at least two open-edged slots in a ring collar of the housing opening which receives the axle pin, said slots holding the at least one resilient housing portion between them.

7. The caster according to claim 1, wherein the caster is designed as a double caster with two wheels, each arranged at one end region of the axle pin, wherein the braking device has resilient housing portions, each facing one wheel.

8. The caster according to claim 1, wherein the at least one spring element projects beyond the at least one resilient housing portion in the direction of the at least one wheel.

9. The caster according to claim 1, wherein the at least one spring element is arranged on a lateral housing surface, acting on the side of the at least one resilient housing portion which faces away from the axle pin, in such a manner that the at least one resilient housing portion is clamped between the at least one spring element and the axle pin.

10. The caster according to claim 9, wherein projections are arranged on the lateral housing surface, defining end regions of the at least one spring element on the lateral housing surface.

18. The caster according to claim 1, wherein the at least one spring element or the braking device which works together with the at least one resilient housing portion to increase the mechanical load capacity of the at least one resilient housing portion.

19. The caster according to claim 3, wherein the at least one spring element is made of metal or a fiber-reinforced plastic.

11. A caster, having a housing, having an axle pin which is arranged in a housing opening oriented substantially horizontally, and on which at least one wheel is mounted, having, at the top, a pin opening oriented substantially vertically, for accommodating a pivot pin, and having a braking device which brakes the at least one wheel in a first load state and releases it in a second load state, wherein the braking device comprises at least one resilient housing portion, wherein the housing opening oriented substantially horizontally is formed in a housing portion which is elastically vertically displaceable relative to the rest of the housing, and wherein the housing portion is integrally connected to the rest of the housing via spring webs.

13. The caster according to claim 11 or 12, wherein the housing portion is separated from the rest of the housing by a gap which defines the vertical displaceability of the housing portion.

14. The caster according to claim 13, wherein an elastically compressible molded part or a leaf spring is arranged in the gap.

15. The caster according to claim 14, wherein a lateral housing surface has at least one laterally protruding projection which serves as a stop for the housing portion.

16. The caster according to claim 11, wherein the housing has at least one projection which protrudes laterally beyond a lateral housing surface and acts as a brake shoe, arranged radially inward relative to a wheel jacket of the at least one wheel, in such a manner that a braking surface of the projection engages with a force fit or a positive fit with the radially-inner region of the wheel jacket in the first load state.

17. The caster according to claim 11, wherein the housing is made of a plastic, in particular polypropylene or polyamide.

12. A caster, having a housing, having an axle pin which is arranged in a housing opening oriented substantially horizontally, and on which at least one wheel is mounted, having, at the top, a pin opening oriented substantially vertically, for accommodating a pivot pin, and having a braking device which brakes the at least one wheel in a first load state and releases it in a second load state, wherein the braking device comprises at least one resilient housing portion and the housing opening oriented substantially horizontally is formed in a housing portion which is elastically vertically displaceable relative to the rest of the housing, wherein the housing portion receiving the axle pin is arranged in a honeycomb structure with open honeycomb cells running parallel to the housing opening which receives the axle pin.

20. The caster according to claim 12, wherein the housing portion is separated from the rest of the housing by a gap which defines the vertical displaceability of the housing portion, and wherein an elastically compressible molded part or a leaf spring is arranged in the gap.