Electromotive furniture drive comprising a drive motor with a brake device

Patent metadata

Field	Value
Publication number	US-11539266-B2
Application number	US-201816493641-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Mar 14, 2017
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

The invention relates to an electromotive furniture drive comprising a drive motor (10). The drive motor (10) has a driveshaft (11) which is mechanically coupled to a brake device (13), and the brake device (13) has a looping wrap spring (15). The electromotive furniture drive is characterized in that the brake device (13) comprises a brake element (17) which is designed to apply a braking torque to the drive shaft (11) in a rotational direction. The brake element (17) is operatively connected to a coupling element (16) in a mechanical manner, and the wrap spring (15) is positioned on an outer lateral surface (161) of the coupling element (16).

First claim

What is claimed is:

1. An electromotive furniture drive, comprising:
a brake device including a looping wrap spring;
a drive motor including a drive shaft which is mechanically coupled to the brake device, said brake device including a brake element configured to apply a braking torque to the drive shaft in one direction of rotation;
a coupling element in mechanical operative connection with the brake element, said looping wrap spring being placed on an outer jacket surface of the coupling element; and
an axial bearing arranged centrally on the coupling element.

2. The electromotive furniture drive of claim 1 , wherein the brake element and the coupling element are connected to one another by a positive-locking connection.

3. The electromotive furniture drive of claim 1 , wherein the brake element and the coupling element are connected to one another with play.

4. The electromotive furniture drive of claim 1 , further comprising a claw coupling to connect the brake element and the coupling element to one another.

5. The electromotive furniture drive of claim 4 , wherein the claw coupling is formed by a radially inwardly facing claw of the coupling element and a corresponding recess of the brake element, with the claw engaging in the recess.

6. The electromotive furniture drive of claim 1 , wherein the wrap spring is configured to wrap around the coupling element with more than one turn.

7. The electromotive furniture drive of claim 1 , wherein the looping wrap spring includes a retaining element at a free end of the looping wrap spring.

8. The electromotive furniture drive of claim 7 , wherein the retaining element is fixed via a housing of the brake device in a stationary manner relative to the housing of the drive motor.

9. The electromotive furniture drive of claim 7 , wherein the retaining element is a hook formed from an end section of the looping wrap spring.

10. The electromotive furniture drive of claim 1 , wherein the drive shaft has a toothing for driving a gear stage.

11. The electromotive furniture drive of claim 10 , wherein the brake device and the toothing are arranged on different sides of the drive motor on the drive shaft.

12. The electromotive furniture drive of claim 1 , wherein the axial bearing has a first bearing surface via which the axial bearing rests against an end face of the drive shaft.

13. The electromotive furniture drive of claim 1 , wherein the axial bearing has a second bearing surface on a cover of a housing of the brake device.

Assignees

• Dewertokin Gmbh
• Dewertokin Tech Group Co Ltd

Inventors

• Müller Sven

Classifications

• F16D49/02

  shaped as a helical band or coil with more than one turn, with or without intensification of the braking force by the tension of the band or contracting member (similar clutches F16D13/08) · CPC title

• F16H2025/2463

  using a wrap spring brake, i.e. a helical wind up spring for braking or locking · CPC title

• H02K7/102 Primary

  with friction brakes · CPC title

• A47C20/041

  by electric motors · CPC title