Furniture drive with an electric drive motor with a braking device

Patent metadata

Field	Value
Publication number	US-12549063-B2
Application number	US-202218281056-A
Country	US
Kind code	B2
Filing date	Mar 3, 2022
Priority date	Mar 11, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A furniture drive includes an electric drive motor and a brake device. The drive motor has an output shaft which projects beyond a motor housing and the brake device has at least one brake element and one force accumulator. The force accumulator permanently loads a friction surface of the at least one brake element with a brake force. The force accumulator and the brake element are configured in one piece. Coefficients of static and sliding friction between the friction surface of the brake element and the output shaft differ by a factor of at least 1.3. An EMF brake is provided for the drive motor.

First claim

The invention claimed is:

1 . A furniture drive, comprising:
an electric drive motor having an output shaft projecting beyond a motor housing; and a braking device comprising at least one braking element and a force accumulator, wherein the force accumulator permanently applies a braking force to a friction surface of the at least one braking element, and wherein the force accumulator and the braking element are integrally formed, wherein static and sliding friction coefficients between the friction surface of the braking element and the output shaft differ by a factor of at least 1.3, and wherein the drive motor is activatable as an EMF brake.

2 . The furniture drive of claim 1 , wherein the force accumulator and the brake element are made of a same material.

3 . The furniture drive of claim 1 , further comprising:
an annular base body circumferentially closed, at least in an outer region.

4 . The furniture actuator of claim 3 , further comprising:
a central opening with inner surfaces forming the friction surfaces of the braking device.

5 . The furniture drive of claim 4 , wherein the annular base body comprises at least one incision starting from the central opening.

6 . The furniture drive of claim 5 , wherein the annular base body further comprises at least one further incision starting from an outer circumference of the annular base body.

7 . The furniture drive of claim 4 , wherein the annular base body has a plurality of incisions starting from the central opening or a plurality of further incisions starting from an outer circumference of the annular base body, wherein the plurality of incisions or the plurality of further incisions are arranged in a star shape.

8 . The furniture drive of claim 4 , wherein the annular base body has a plurality of incisions starting from the central opening and a plurality of further incisions starting from an outer circumference of the annular base body, wherein the plurality of incisions and the further plurality of incisions are arranged alternating circumferentially.

9 . The furniture drive of claim 4 , wherein the annular base body is disc-shaped and made of a solid material.

10 . The furniture drive of claim 9 , wherein the annular base body is made of zinc, bronze, or PEEK.

11 . The furniture drive of claim 9 , wherein a surface of the annular base body forms the friction surface of the at least one braking element.

12 . The furniture drive of claim 9 , further comprising:
at least one additional ring segment applied to the annular base body and facing the central opening, wherein a surface of the at least one additional ring segment forms the friction surface of the braking element.

13 . The furniture drive of claim 1 , wherein the braking device is arranged in or on a motor mount.

14 . The furniture drive of claim 1 , wherein the braking device is integrated into the electric drive motor.

15 . The furniture drive of claim 14 , wherein the braking device is a sliding bearing for the output shaft of the electric drive motor.

16 . The furniture drive of claim 1 , wherein the drive motor is activatable as the EMF brake by a short circuit at terminals of the drive motor by a control device of the furniture drive.

17 . The furniture drive of claim 1 , wherein the furniture drive is a spindle lifting drive.

Assignees

• Dewertokin Tech Group Co Ltd

Inventors

• Müller Christian

Classifications

• H02K7/1166

  comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081) · CPC title

• F16D2200/0026

  Non-ferro · CPC title

• F16D2127/002

  speed-responsive · CPC title

• F16D59/00

  Self-acting brakes, e.g. coming into operation at a predetermined speed · CPC title

• A47C31/00

  Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets · CPC title