| 摘要 |
A device for adjusting the angular position of a movable support has two frames which are pivotally connected to each other along a pivot axis and are capable of being moved apart by the action of pretensioned torsion spring rods provided near the pivot axis so that the two frames assume variable angular positions with respect to each other. The movable support frame in its upwardly directed angular position may serve as a supporting surface for a mattress at the head end of a bed frame. To effect angular adjustment, two steel cables fastened to one frame are trained over pulleys disposed on the other frame and are guided to a pivot lever pivotably attached to the other frame and are actuated by an electric motor. As the motor is operative, the steel cables cause the frames to be pulled in one direction toward each other against the action of the torsion spring rods and the pneumatic springs. Reversing the direction of the motor will cause the frames to move away from each other due to the action of the torsion spring rods and pneumatic springs. |
