| 摘要 |
A linear actuator device for pieces of furniture, e.g. beds, is described which include an adjustable section (2, 3) pivotally embedded in a frame (1). The section (2, 3) is raised and lowered by at least one rod (23, 24) mounted on a pivot shaft (4, 6). The actuator comprises a housing (8) with a bushing (10) receiving the pivot shaft (4, 6), and a spindle (14) driven by a low-voltage DC motor (11). The spindle (14) carries a spindle nut (12) fixed against rotation which in one direction of motion operates an arm (5, 7) mounted on the pivot shaft (4, 6) for adjusting the section within the piece of furniture. By designing the arm (5, 7) such that, when it engages the spindle nut (12), it will rest against an area (17) of the nut's end which faces farthest away from the shaft, an expedient moment curve for pivoting the section is obtained, as a large moment occurs at the beginning and the end of the section's movement just when needed. In the initial horizontal position of the section, a large moment is needed, and so is in the end position, when for instance a mattress is folded which requires a large moment. The area, which the end of the arm (5, 7) rests against is expediently equipped with a roller (17) which reduces friction and wear on the spindle nut. |
