A linear actuator with self-locking spindle

A technology of an actuator and a rotating shaft, which is applied in the field of furniture and can solve problems such as insufficient space for the actuator
CN1742174AInactive Publication Date: 2006-03-01LINAK AS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LINAK AS
Publication Date
2006-03-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

An actuator, preferably a linear actuator for furniture, comprises a brake spring (20) in the form of a helical spring having a plurality of windings wound around a cylindrical element (10) of plastics rotatable at least during braking, said spring being tightened around the cylindrical element for braking. The frictional heat generated hereby can cause the plastics to be deformed, which adversely affects the braking power. This is solved by providing the cylindrical element (10) consisting of plastics with an insert (12) of metal for carrying off the frictional heat preferably into other metal parts of the actuator that may serve as cooling faces. To carry off heat additionally, it is proposed to arrange a second heat-conducting element (18) in intimate contact with the outer side of the spring (20), said element being likewise connected with other metal parts of the actuator that may serve as cooling faces.
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Description

technical field

[0001] The invention relates to an actuator, preferably for furniture, comprising a retaining brake spring in the form of a helical spring wound several times around a plastic cylindrical element which is rotatable at least during braking, The spring is tensioned around the cylindrical element for braking. Background technique

[0002] EP662573B1 discloses a linear actuator of the type mentioned above. To illustrate the background of the present invention, reference is made to this EP document as figure 2 Example shown. The illustrated actuator is driven by an electric motor which drives a shaft through a worm drive. A nut is arranged on the rotating shaft, and the extension rod is fixed on the nut. The worm is formed in an extension of the motor shaft and is steel. On the worm wheel side as an integral part of the worm wheel there is provided a cylindrical element around which a brake spring is positioned, one end of which is fastened to the motor housi...

Claims

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