Patent ID: 6517041
Filing Date: 2003-02-11
Classification: B60N,G05G

Abstract:
An arrangement for displacing a displacement member along a stationary base, comprising:an elongate actuating member, at least one linear tooth means on the displacement member, first and second axially mutually spaced ratchet members pivotably mounted on the actuating member at at least one longitudinal edge thereof, the ratchet members including with each other an opening angle and having ratchet tooth means matching the linear tooth means, spring members urging the ratchet members towards the linear tooth means, and a disengagement member for the ratchet members, the disengagement member being disposed between the at least one linear tooth means and the actuating member, and said disengagement member being fixed with respect to the base and being operable to determine a respective linear displacement advance movement step in a respective first direction of displacement, wherein frictional conditions between the displacement member and the base are such that the actuating member is operable to entrain the displacement member stepwise in a ratcheting movement in said respective first direction of displacement, but in the direction opposite to said respective first direction the displacement member is secured to the base by frictional engagement and only said actuating member is moved back in ratcheting mode in relation to the displacement member by said displacement advance movement step.