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US 2011/0120243 A1Published application
Linear actuator for height adjustable columns
AssigneeKih-Utveckling AB
InventorHans PETTERSSON
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AssigneeKih-Utveckling AB
InventorHans PETTERSSON
Estimating the term…
The present invention concerns a linear actuator (1), comprising a threaded spindle (10) with a longitudinal extension along a longitudinal axis (X), the spindle (10) having a right hand thread (11) and a left hand thread (12), both threads provided over a common longitudinal length of the spindle, the spindle (10) being adapted to be rotated by a driving device (60). The linear actuator further comprises a first nut member (20) provided with a right hand thread (21) and a second nut member (30) provided with a left hand thread (31). The first and the second nut members (20, 30) are in threaded connection with the spindle (10) in such a way that rotation of the spindle provides opposite linear movement of the nut members (20, 30) relative to each other along the longitudinal axis (X). Thereby, a linear actuator is provided with three parts that all move linearly relative to each other during rotation of the spindle.
Linear actuator (1) for height adjustable columns comprising:
Linear actuator according to any of the preceding claims, wherein the nut members (20, 30) each has a length along the longitudinal axis (X) that is at least as long as the longitudinal length of the spindle (10).
Linear actuator according to any of the preceding claims, wherein the linear actuator further comprises a holding device (41, 42) arranged to hold the first and the second nut members in threaded connection with the spindle.
Linear actuator according to any of the preceding claims, wherein the spindle (10) is hollow providing an opening (14) from an end of the spindle along the longitudinal axis (X) for receiving a driving shaft (61) from a driving device.
Linear actuator according to any of the preceding claims, wherein the linear actuator further comprises an inner tube (51), a middle tube (52) and an outer tube (53), said tubes are arranged for telescopic movement relative to each other.
Linear actuator according to any of the preceding claims, wherein the linear actuator further comprises a driving device (60) and a driving shaft (61) connected to the driving device, the driving shaft being further connected to the spindle (10) such that when the driving shaft is rotated by the driving device (60), the spindle is rotated.
Dependencies are inferred from the claim text.