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Back-rest adjuster with a free pivot device

  • US 4,930,841 A
  • Filed: 05/17/1989
  • Issued: 06/05/1990
  • Est. Priority Date: 05/18/1988
  • Status: Expired due to Fees
First Claim
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1. A back rest adjuster with a free pivot device for a motor vehicle and comprising a lower fitting part to be connected to the seat frame and an upper fitting part to be connected to the back-rest, the two fitting parts being connected pivotally to each other by a hinge pin defining the pivot axis of the back-rest, and comprising a self-locking gearing, the input of which is to be coupled to a drive device while its output shaft can be connected to the upper fitting part via a torque transmitting means, characterized in that(a) the torque transmitting means comprises a shiftable clutch which has to be disengaged to allow free pivoting and which comprises a first clutch part coupled to the output shaft of the gearing and a second clutch part mounted on the hinge pin, said two clutch parts adapted for movement in an axial direction in relation to each other;

  • (b) the first clutch part, which has to be moved from a shift in the direction of its axis of rotation, is associated with a memory ring adapated for movement together with and disposed concentrically of said first clutch part, the said memory ring being disposed between a drive ring which is non-rotatable in relation to the upper fitting part and a ratchet ring which is non-rotatable in relation to the lower fitting part whereby during pivoting of the upper clutch part the memory ring rotates together with the upper fitting part when the clutch is engaged, and remains stationary when the clutch is disengaged;

    (c) the memory and the drive ring which, when the clutch is disengaged, are to a limited degree rotatable in relation to each other, are form-lockingly coupled to each other only in one single position at the end of the range of rotation when the clutch is engaged, whereby when the back-rest is folded back, the upper fitting part is stopped in the same position in which it is started for folding; and

    (d) when the clutch is disengaged, the memory ring can in any rotary position be coupled in form-locking fashion to the ratchet ring which is non-rotatable in relation to the lower fitting part.

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