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US 7,111,901 B2Granted
Headrest for automotive vehicle seats
AssigneeGrammar AG
InventorsManfred Schlierf, Josef Meier, Thomas Wallinger
Life of this patent
Estimating the term…
Abstract
A headrest for a motor vehicle seat is crash active in that it has a mechanism for automatically bringing the head-engaging member toward the head of the passenger in the case of a crash. This mechanism includes a slide guided on a pair of cylindrical members surrounded by springs and having a tooth-forming part of a return travel lock preventing return of the slide to its starting position. In that position a releasable coupling device has a primary coupling element engaged with a secondary coupling element which may be a hairpin-shaped bent wire.
Claims22
A headrest for a motor-vehicle seat, the headrest comprising:
- a main headrest body adapted to be mounted on a back of the seat;
- a cylinder extending along an axis and mounted on the main headrest body;
- a slide displaceable in a straight line axially along the cylinder;
- a head-engaging member carried on the slide and having a surface juxtaposable with a back of a head of a passenger in the seat, the head-engaging member and slide being jointly displaceable along the cylinder between an outer activated position and an inner rest position;
- a spring extending along the cylinder and braced between the slide and the main headrest body and urging the slide and head-engaging member outward into the outer activated position;
- return-lock means including
- a locking tooth on the slide, and
- a countertooth on the main headrest body engageable with the locking tooth after outward displacement of the slide toward the outer position from the inner position for preventing displacement of the slide and head-engaging member inward toward the inner rest position;
- releasable-coupling means including
- a primary element on the slide, and
- a secondary element on the main headrest body engageable with the primary element for releasably retaining the slide in the rest position, whereby, when the releasable-coupling means releases the slide, the slide moves outward in a straight line toward the outer position and the return-lock means inhibits inward movement back toward the inner position;
- and
- a control element extending along the cylinder and defining a control track cooperating and engageable with the locking tooth and carrying the countertooth.
10 more elements
A headrest for a motor-vehicle seat, the headrest comprising:
- a main headrest body adapted to be mounted on a back of the seat;
- a cylinder extending along an axis and mounted on the main headrest body;
- a slide displaceable in a straight line axially along the cylinder;
- a head-engaging member carried on the slide and having a surface juxtaposable with a back of a head of a passenger in the seat, the head-engaging member and slide being jointly displaceable along the cylinder between an outer activated position and an inner rest position;
- a spring extending along the cylinder and braced between the slide and the main headrest body and urging the slide and head-engaging member outward into the outer activated position;
- return-lock means including
- a locking tooth on the slide, and
- a countertooth on the main headrest body engageable with the locking tooth after outward displacement of the slide toward the outer position from the inner position for preventing displacement of the slide and head-engaging member inward toward the inner rest position;
- and
- releasable-coupling means including
- a primary element on the slide, and
- a secondary element on the main headrest body engageable with the primary element for releasably retaining the slide in the rest position, whereby, when the releasable-coupling means releases the slide, the slide moves outward in a straight line toward the outer position and the return-lock means inhibits inward movement back toward the inner position, the cylinder being mounted by a pivot on said main headrest body.
9 more elements
A headrest for a motor-vehicle seat, the headrest comprising:
- a main headrest body adapted to be mounted on a back of the seat;
- a cylinder extending along an axis and mounted on the main headrest body;
- a slide displaceable in a straight line axially along the cylinder;
- a head-engaging member carried on the slide and having a surface juxtaposable with a back of a head of a passenger in the seat, the head-engaging member and slide being jointly displaceable along the cylinder between an outer activated position and an inner rest position;
- a spring extending along the cylinder and braced between the slide and the main headrest body and urging the slide and head-engaging member outward into the outer activated position;
- return-lock means including
- a locking tooth on the slide, and
- a countertooth on the main headrest body engageable with the locking tooth after outward displacement of the slide toward the outer position from the inner position for preventing displacement of the slide and head-engaging member inward toward the inner rest position;
- and
- releasable-coupling means including
- a coupling pin fixed to the slide, and
- a coupling spring wire having a hairpin configuration on the main headrest body engageable around the coupling pin for releasably retaining the slide in the rest position, the coupling pin being retained in the coupling spring wire in a narrowed position thereof and released therefrom in a spread position thereof, whereby, when the releasable-coupling means releases the slide by spreading of the coupling spring wire, the slide moves outward in a straight line toward the outer position and the return-lock means inhibits inward movement back toward the inner position.
9 more elements
Dependencies are inferred from the claim text.