Seat

Abstract

A seat, in particular a motor-vehicle seat, having a seat-adjusting mechanism is described. The seat-adjusting mechanism comprises a motor-driven spindle unit with a nut which has an inner profiled portion and a spindle which has an outer profiled portion. The spindle unit comprises a plurality of rollers which are arranged in planetary manner between the nut and the spindle and cooperate with the nut and the spindle. Each of the rollers has at least one outer profiled portion.

1 . A seat having a seat-adjusting mechanism with a motor-driven spindle unit, the spindle unit comprising 
 a) a nut which has an inner profiled portion;    b) a spindle which has an outer profiled portion; and    c) a plurality of rollers which are arranged in planetary manner between the nut and the spindle, each roller having at least one outer profiled portion and cooperating with both the nut and the spindle.    
     
     
         2 . The seat according to  claim 1 , wherein the rollers each have a single outer-profiled portion and, by way of this outer profiled portion, cooperate both with the inner profiled portion of the nut and with the outer profiled portion of the spindle.  
     
     
         3 . The seat according to  claim 1 , wherein the rollers each have two different outer profiled portions and cooperate with the inner profiled portion of the nut by means of a first of the two outer profiled portions, and with the outer profiled portion of the spindle by means of a second of the two outer profiled portions.  
     
     
         4 . The seat according to  claim 3 , wherein the two outer profiled portions are arranged in regions of each roller which follow one another in the axial direction.  
     
     
         5 . The seat according to  claim 3 , wherein the first outer profiled portion is coarser than the second outer profiled portion.  
     
     
         6 . The seat according to  claim 1 , wherein the outer profiled portion of each roller comprises grooves.  
     
     
         7 . The seat according to  claim 6 , wherein the grooves of rollers which are adjacent in a peripheral direction of the spindle are offset axially with respect to one another.  
     
     
         8 . The seat according to  claim 1 , wherein the nut has an inner profiled portion in the form of grooves.  
     
     
         9 . The seat according to claims  1 , wherein the spindle has an outer profiled portion in the form of a single-lead or multi-lead thread.  10 .  
     
     
         10 . The seat according to  claim 9 , wherein the pitch of the thread of the spindle is less than 5 mm.  
     
     
         11 . The seat according to  claim 1 , wherein the spindle has an outer profiled portion or the nut has an inner profiled portion in the form of a multi-lead thread, and wherein the number of rollers corresponds to the number of threads.  
     
     
         12 . The seat according to  claim 1 , wherein the efficiency of the spindle unit is greater than 50%.  
     
     
         13 . The seat according to  claim 1 , wherein the seat-adjusting mechanism is constructed without gears.  
     
     
         14 . The seat according to  claim 1 , wherein the spindle is mounted such that it is stationary with respect to a seat under-frame, and the nut is movable relative to the seat under-frame.  
     
     
         15 . The seat according to  claim 14 , wherein the seat-adjusting mechanism comprises a lever which has a lever arm coupled to the nut.  
     
     
         16 . The seat according to  claim 1 , wherein the seat-adjusting mechanism comprises a blocking mechanism for the spindle unit.  
     
     
         17 . The seat according to  claim 1 , wherein the seat-adjusting mechanism comprises a unit for determining the position or angular position of the spindle.  
     
     
         18 . A vehicle seat having a seat-adjusting mechanism with a motor driven spindle unit, the spindle unit having an efficiency of more than 50% and comprising 
 a) a nut which has an inner profiled portion;    b) a spindle which has an outer profiled portion; and    c) a plurality of rollers which are arranged in planetary manner between the nut and the spindle, each roller having at least one outer profiled portion and cooperating with both the nut and the spindle.    
     
     
         19 . A seat having a seat-adjusting mechanism with a motor-driven spindle unit, the spindle unit comprising 
 a) a nut which has an inner profiled portion;    b) a spindle which has an outer profiled portion in the form of a thread having a pitch of less than 5 mm; and    c) a plurality of rollers which are arranged in the manner of a planetary gear between the nut and the spindle and cooperate with the nut and the spindle, and which have each at least one outer profiled portion.