Adjusting and fixing device for seats, like automobile seats, in

Abstract

Adjusting and fixing device for seats, like automobile seats, in particular for the adjustment of the back rest. For the adjustment of the back rest vis-a-vis the seat part a fixed mounting is arranged at the seat part. This fixed mounting is joined with an adjustable mounting for the back rest transferring the adjusting movement over a gearing drivable by means of a cam section, defining the position of these mountings related to each other. The gearing includes a radial tooth wheel belonging to a mounting and an internal gear rim of the other mounting catching into the first one, whereby counter toothings are arranged at the mountings. The cam section is formed by two wedge segments inclined against each other and encompassing the bearing point of the adjustable mounting regionally. The wedge sections are wrapped around by the bearing point of the fixed mounting, whereby the narrow sides of the wedge segments can be charged by the arm of a driver designed as a bush, whereas a force accumulator pressing the wedge away from each other for radial play reduction catches between the broad sides of the wedge segments. For the prevention of the afflux of the mounting joined with the back rest during a time period marked by vibration and impacts and dynamic operational conditions a locking ring is arranged in the radial plane between the wedge segments and the driver. This locking ring contains at its outer periphery at least one check nose, which can catch into the counter toothing of the fixed mounting. This check nose is held in the engaged position in the counter toothing by a spring element supporting itself at the bearing points of the fixed mounting, this spring element being incident to the locking ring. The check nose, however, can be driven out of the counter toothing by stops of the driver during the rotational movement of the same.