| 摘要 |
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. |
| 主权项 |
1. A linear actuator (1) for height adjustable columns comprising:
a threaded spindle (10) with a longitudinal extension along a longitudinal axis (X), characterized in that the spindle has a right hand thread (11) and a left hand thread (12), both threads provided over an entire common longitudinal portion of the spindle, the spindle being adapted to be rotated by a driving device (60), the linear actuator further comprising: 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), wherein the first and the second nut members are in threaded connection with the spindle in such a way that rotation of the spindle provides opposite linear movement of the nut members relative to each other along the longitudinal axis,
wherein the first nut member (20) bears against a first portion of the circumference of the spindle (10), and the second nut member (30) bears against a second portion of the circumference of the spindle, the second portion being opposite the first portion, such that the first and the second nut members together bear against less than the whole circumference of the spindle,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,wherein the holding device comprises a first holding part (41) and a second holding part (42) arranged to abut the two nut members, and wherein the first holding part is arranged to hold the first nut member in threaded connection with the spindle and the second holding part is arranged to hold the second nut member in threaded connection with the spindle, andwherein the first and second holding parts together surround the entire circumference of the first and second nut members. |
