Vehicle seat
First Claim
1. A resiliently-mounted vehicle seat, comprising a seat frame;
- a seat cushion carried by said seat frame, an underframe connected to said seat frame;
a linkage at each side of the underframe supporting the seat from the underframe, at least one of said linkages including an extension piece joined thereto which has a guide edge formed thereon;
a spring and damping unit including tension springs interposed between said linkages and said seat, a shaft to which one end of each spring is pivotally connected, said guide edge as formed on an extension piece being in the form of an arc, the axis of the radius of curvature of which is defined by said shaft, a bar engaging said guide edge and extending transversely of said guide edge for movement therealong, said springs being located on both sides of the extension piece and engaging said bar for urging said bar against said guide edge, said bar including hinged sections that define a clamping groove therebetween and in which said guide edge is received, said hinged sections being movable in a pincer-like manner upon application of a load to said seat frame to grip the extension piece, and stop yokes located at the outer sides of said springs and being pivotal about said shaft for engagement with the outer ends of said bar, said stop yokes having an effective length somewhat greater than the radius of curvature of said guide edge and the unloaded condition of the seat frame, wherein said bar is movable along said guide edge in an unloaded condition of said seat frame, while in the loaded condition of said seat frame, said bar grips the extension piece to determine the point of application of said springs on the extension piece and the moment exerted on the linkage by said springs.
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Accused Products
Abstract
A resiliently-mounted vehicle seat has a spring unit on the linkage between the seat frame and the underframe. The unit is interposed between the linkage and the seat frame and includes springs which extend between an extension of the linkage and the seat frame. The springs are connected to a bar which engages the extension at an adjustable position along its length to vary the restoring force of the springs on the linkage according to the weight of the occupant.
Movement of the bar along the extension is controlled by virtue of a selective gripping action of the bar on the extension so that in the unloaded condition of the seat the bar does not grip the extension.
As an additional feature a mechanism is provided for selecting the desired position of the bar on the extension when the seat is occupied, the bar moving when vibrations in the seat unload the unit.
7 Citations
5 Claims
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1. A resiliently-mounted vehicle seat, comprising a seat frame;
- a seat cushion carried by said seat frame, an underframe connected to said seat frame;
a linkage at each side of the underframe supporting the seat from the underframe, at least one of said linkages including an extension piece joined thereto which has a guide edge formed thereon;
a spring and damping unit including tension springs interposed between said linkages and said seat, a shaft to which one end of each spring is pivotally connected, said guide edge as formed on an extension piece being in the form of an arc, the axis of the radius of curvature of which is defined by said shaft, a bar engaging said guide edge and extending transversely of said guide edge for movement therealong, said springs being located on both sides of the extension piece and engaging said bar for urging said bar against said guide edge, said bar including hinged sections that define a clamping groove therebetween and in which said guide edge is received, said hinged sections being movable in a pincer-like manner upon application of a load to said seat frame to grip the extension piece, and stop yokes located at the outer sides of said springs and being pivotal about said shaft for engagement with the outer ends of said bar, said stop yokes having an effective length somewhat greater than the radius of curvature of said guide edge and the unloaded condition of the seat frame, wherein said bar is movable along said guide edge in an unloaded condition of said seat frame, while in the loaded condition of said seat frame, said bar grips the extension piece to determine the point of application of said springs on the extension piece and the moment exerted on the linkage by said springs. - View Dependent Claims (2, 3, 4, 5)
- a seat cushion carried by said seat frame, an underframe connected to said seat frame;
Specification