DEVICE FOR DISPLACING AN OBJECT A CERTAIN DISTANCE

摘要

A device for displacement of an object (4) a certain distance which object is displaceable between a forward position (9) and a rearward position (10), comprising a unit (14) displaceable between a first position (12) and a second position (13) for driving the object a distance corresponding to the distance between the first and the second position by means of a friction joint (15) when the driving unit (14) is displaced from the first position to the second position. The friction joint is designed to enable displacement of the driving unit (14) and the object (4) relative to each another under the influence of a certain lowest force. Furthermore, the device comprises a member (16) which is arranged to act on the driving unit (14) in a direction towards the second position (13) by means of a spring force and a component (21) for interconnecting the driving unit (14) and the object (4). The interconnecting component (21) has a surface (22) which is designed to form the friction joint (15) in cooperation with a surface (23) of the driving unit, and the interconnecting component and the object are interconnected so that the interconnecting component and the object are locked against displacement relative to each other when the object (4) is acted on in a direction towards the forward position (9) and the interconnecting component (21) is acted on in the opposite direction, for driving the object (4) to the rearward position (10) by means of interconnecting component (21) when the driving unit (14) is displaced to the second position (13) during influence of the spring member and for driving unit (14) to the first position (12) by means fo the interconnecting component (21) when the object (4) is displaced to the forward position (9).