Vehicle seats
First Claim
1. A vehicle seat comprisinga seat part,a base part,a suspension interconnecting the seat part and the base part and forming a guide for the upward and downward movement of the seat part relative to the base part,a seat-supporting spring which acts upwardly on the seat part and, under static load conditions supports the seat part and the seat occupant at a ride position which is adjustable by varying the preload of the spring, the seat having elements which move relatively to one another during rise and fall of the seat part relative to the base part,an up-stop device and an up-stop abutment mounted respectively on said relatively movable elements of the seat,a support member fixed to one said element and on which the up-stop device is movably mounted, said up-stop device being movable relative to the support member to vary the up-stop position, namely, the height of the seat part at which further upward movement of the seat part is prevented by mutual engagement of the up-stop device and up-stop abutment, characterised by the improvement thatthe up-stop device is compressible, against the force of a first return spring, through a distance corresponding to the distance between the ride position of the seat and the up-stop position, and the seat includes,a normally engaged, but releasable, locking device for locking the up-stop device to said support member, and,a second return spring which acts on the up-stop device and, upon release of the locking device, urges the up-stop device against the abutment device with a force substantially weaker than the force of the first return spring.
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Accused Products
Abstract
The invention relates to a vehicle seat, of the type in which a seat part is spring-mounted on a base part and in which the height of the seat part above the base part can be varied by varying the preload of the spring. The movement of the seat part is limited by UP-stop and DOWN-stop assemblies and the invention provides means for automatically moving the UP-stop position in dependence upon a change to the static height of the seat.
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Citations
6 Claims
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1. A vehicle seat comprising
a seat part, a base part, a suspension interconnecting the seat part and the base part and forming a guide for the upward and downward movement of the seat part relative to the base part, a seat-supporting spring which acts upwardly on the seat part and, under static load conditions supports the seat part and the seat occupant at a ride position which is adjustable by varying the preload of the spring, the seat having elements which move relatively to one another during rise and fall of the seat part relative to the base part, an up-stop device and an up-stop abutment mounted respectively on said relatively movable elements of the seat, a support member fixed to one said element and on which the up-stop device is movably mounted, said up-stop device being movable relative to the support member to vary the up-stop position, namely, the height of the seat part at which further upward movement of the seat part is prevented by mutual engagement of the up-stop device and up-stop abutment, characterised by the improvement that the up-stop device is compressible, against the force of a first return spring, through a distance corresponding to the distance between the ride position of the seat and the up-stop position, and the seat includes, a normally engaged, but releasable, locking device for locking the up-stop device to said support member, and, a second return spring which acts on the up-stop device and, upon release of the locking device, urges the up-stop device against the abutment device with a force substantially weaker than the force of the first return spring.
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6. A vehicle seat comprising
a seat part, a base part, a suspension mounting the seat part for upward and downward movement relative to a base part, a spring biassing the seat part in an upward direction toward an up stop position, an up stop device and an abutment device mounted respectively on elements of the seat which move relatively to each other as the seat part moves relatively to the base part, a normally operative locking device locking the up stop device in position, the up stop device being compressible against the force of a first return spring through a distance corresponding to the distance between the ride position of the seat and the up stop position, and, a second return spring operable, while the up stop device is released from the locking device, to urge the up stop device against the abutment device with a force substantially weaker than the force of the first return spring to reposition the up stop device in response to each release of the locking device.
Specification