Motor vehicle seat

Abstract

A motor vehicle seat includes at least one adjusting device, by means of which the position of a seat part can be adjusted against its weight and/or against the weight of a vehicle occupant sitting on the seat, and at least one spring element, which acts under preload on a kinematic chain of at least one adjusting device in order to reduce the backlash thereof, the kinematic chain transmitting the adjusting force. The spring element is arranged such that, on an adjustment of the seat part against the weight, the spring element is released, in order to supply the kinematic chain with spring energy, and tensioned on an adjustment of the seat part in the weight direction.

1 . A motor vehicle seat comprising: 
 at least one adjusting device with which a seat part can be adjusted in position with and opposite a loading direction; and    at least one spring element which acts under pretension on a kinematic chain of the at least one adjusting device transferring the adjusting force;    wherein the spring element is arranged so that it on the one hand serves for reducing a backlash in the adjusting device and on the other hand during adjustment of the seat part opposite the loading direction it relaxes so that spring energy is fed into the kinematic chain; and    wherein during adjustment of the seat part in the loading direction the spring element is tensioned.    
     
     
         2 . The motor vehicle seat of  claim 1 , wherein the spring element exerts a force with a component in the loading direction at a force engagement point which is associated with the seat part which is to be adjusted.  
     
     
         3 . The motor vehicle seat of  claim 2 , wherein the force engagement point of the spring element which is associated with the seat part which is to be adjusted is moved during adjustment of the seat part opposite the loading direction so that the spring element relaxes.  
     
     
         4 . The motor vehicle seat of  claim 3 , wherein the spring element serves for reducing the play of an adjusting device for a height of a seat part which during adjustment of the height causes a simultaneous displacement of the seat part in a seat longitudinal direction; and 
 wherein the spring element is tensioned between its two force engagement points so that it relaxes when the seat part is raised as a result of the simultaneous displacement of the seat part in the seat longitudinal direction.    
     
     
         5 . The motor vehicle seat of  claim 4 , wherein the spring element is tensioned inclined towards the loading direction.  
     
     
         6 . The motor vehicle seat of  claim 3 , wherein the spring element serves for reducing the play of an adjusting device for an incline of a seat part which is mounted to swivel about an axis whereby adjustable seat part forms in relation to the swivel axis a first lever arm and the force engagement point of the spring element associated with the seat part engages on a second lever arm of the seat part.  
     
     
         7 . The motor vehicle seat of one of the preceding claims, wherein the spring element is formed as a tension spring whose force engagement points approach one another when adjusting the seat part opposite the loading direction and move further away from each other during adjustment of the seat in the loading direction.  
     
     
         8 . The motor vehicle seat of one of  claims 1  to  6 , wherein the spring element is formed as a compression spring whose force engagement points move further away from each other during adjustment of the seat part opposite the loading direction and approach one another when adjusting the seat part in the loading direction.  
     
     
         9 . The motor vehicle seat of  claim 1 , wherein all links of the kinematic chain of the adjusting device lie between the force engagement points of the spring element.  
     
     
         10 . The motor vehicle seat of  claim 1 , wherein at least one force engagement point of the spring element is mounted outside of the kinematic chain of the adjusting device.  
     
     
         11 . The motor vehicle seat of  claim 1 , wherein one force engagement point of the spring element is provided on a component part which does not change its spatial position as a result of actuation of the adjusting device.  
     
     
         12 . The motor vehicle seat of  claim 11 , wherein the force engagement point is mounted on a top rail of a rail longitudinal guide or a part fixedly connected to the top rail.  
     
     
         13 . The motor vehicle seat of  claim 1 , wherein a force engagement point of the spring element is provided on a part which changes its position at the same time as the adjusting device is actuated.  
     
     
         14 . The motor vehicle seat of  claim 13 , wherein the force engagement point of the spring element is provided on a link of the kinematic chain.  
     
     
         15 . The motor vehicle seat of  claim 14 , wherein the force engagement point is mounted on a lever arm or a gearing element of the kinematic chain.  
     
     
         16 . The motor vehicle seat of  claim 1 , wherein a force engagement point of the spring element is provided on an additional gearing element which acts on an element of the kinematic chain.  
     
     
         17 . The motor vehicle seat of  claim 16 , wherein the additional gearing element acts on a gearing element of the kinematic chain.  
     
     
         18 . The motor vehicle seat of  claim 16  or  17 , wherein the additional gearing element acts under the pretensioning force of the spring element on the gearing element of the kinematic chain so that movement of the gearing element which leads to a displacement of the seat part opposite the loading direction is assisted.  
     
     
         19 . The motor vehicle seat of  claim 1 , wherein the adjusting device has an additional gearing element on which the spring element engages and which is in active connection with a drive element so that the spring force counters an output force caused by the weight.  
     
     
         20 . The motor vehicle seat of  claim 16 , wherein the additional gearing element acts under the pretensioning force of the spring element on the gearing element of the kinematic chain so that the gearing element is tensioned by removing play against another gearing element of the kinematic chain.  
     
     
         21 . The motor vehicle seat of  claim 16 , wherein the adjusting device has a drive pinion whose teeth engage in counter teeth of a gearing element mounted in the kinematic chain, and that the teeth of the additional gearing element are designed to agree with the teeth of the gearing element mounted in the kinematic chain and that the additional gearing element preferably acts on the drive pinion against the force caused by the weight action.  
     
     
         22 . The motor vehicle seat of  claim 16 , wherein a gearing element mounted in the kinematic chain and the additional gearing element are formed as pivotally mounted toothed segment levers whereby the additional gearing element is mounted freely pivotal on the axis of the gearing element mounted in the kinematic chain.  
     
     
         23 . The motor vehicle seat of  claim 22 , wherein the force engagement point of the spring element on the additional gearing element in relation to the pivotal axis of the gearing element mounted in the kinematic chain lies on a side remote from the drive pinion.