Locking system for a device adjustable by translational motion,

Details Locking system for a device adjustable by translational motion, Locking system for a device adjustable by translational motion,

1995-06-15

1997-01-07

Nelson, Jr., Milton

Chairs and seats

Crash seat

Force-absorbing means incorporated into headrest area

297410, B60N 242

Patent

active

055909299

ABSTRACT:
A vertically adjustable vehicle headrest has at least one slider translationally mounted in a guide. The slider has a plurality of locking notches regularly spaced along its length and a bistable headrest locking system is provided that includes a movably mounted cam that normally rests in a stable unlocked position relative to the notches thus allowing adjustable translational displacement of the slider relative to the guide. The cam is alternately movable to a stable locked position relative to the notches thus inhibiting translational displacement of the slider relative to the guide. A spring is mounted at a first end to a stationary member and at a second end to the cam for maintaining the cam in one of two bistable positions, namely, in a stable locked position or a stable unlocked position. The resilient device overcomes a biasing force when in the stable unlocked position and in response to rear impact to a vehicle that causes displacement of the cam to the stable locked position.

REFERENCES:
patent: 3512832 (1970-05-01), Kage
patent: 3542429 (1970-11-01), Inoue et al.
patent: 4639039 (1987-01-01), Donovan
patent: 4844545 (1989-07-01), Ishii
patent: 4976493 (1990-12-01), Frankila
patent: 5156440 (1992-10-01), Vidwans

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