Abstract: In a seat suspension wherein a seat part is slidable fore-and-aft on a suspension part, a latching member having an elongated slot therein is swingable to and from a normal position about a rivet secured to the seat part and extending through the slot. In its normal position, the latching member engages the suspension part to be locked against fore-and-aft motion, but the seat part can move fore-and-aft between slot-defined limits. A control member is pivoted to the latching member on an axis spaced from and parallel to that of said rivet, which extends through a triangular cutout in the control member. The control member has one limit position wherein a portion of said cutout registers with said slot for fore-and-aft shock isolating motion of the seat part and an intermediate position wherein an apex portion of the cutout engages the rivet to prevent seat part motion.

Abstract: A hydraulic seat cushioning device comprising a cylinder body and a piston has a concentric post-like upward projection in the cylinder body with a cylindrical surface in which there are a pressure fluid port and a vent port. An annular valving element closely slidably surrounding the post-like portion covers those ports when in a normal position but uncovers the vent port when above that position and uncovers the pressure fluid port when below it. The piston is so connected with the valving element as to move independently thereof in a lower portion of its stroke, but through the remainder of the piston stroke the valving element is constrained to move with the piston.

Abstract: A vehicle seat comprises a seat assembly including a seat pan, a backrest assembly including a backrest pan, a backrest height adjustment mechanism connected between the seat pan and the backrest pan and including a height adjustment knob, and a backrest tilt adjustment mechanism connected between the seat pan and the backrest pan and including a tilt adjustment knob. The backrest pan can be tilted regardless of its vertical position relative to the seat pan and can be moved vertically regardless of its tilted position relative to the seat pan. The tilt adjustment mechanism further includes a connector assembly connected to and tiltable in response to rotation of the tilt adjustment knob and including a pair of relatively slideable connector members, one of the connector members being connected to the tilt adjustment knob and the other of the connector members being connected to the backrest pan.

Abstract: A vehicle seat comprises a pair of laterally spaced apart support plates, a pair of laterally spaced apart arm rests, and independently adjustable arm rest support assemblies for adjustably supporting each arm rest on an associated support plate so that each arm rest can be shifted and also pivoted to different positions in a vertical plane. Each arm rest assembly comprises a pair of elongated support links; a link plate; and pivot means for pivotably connecting the link plate and one end of one elongated support link to the arm rest whereby the arm rest can be pivoted to different positions thereabout. The other elongated support link has one end pivotally connected to the link plate and its other end pivotally connected to the support plate.

Abstract: A vehicle seat backrest assembly comprises a backrest pan, a rod in front of the pan, and a resilient sponge rubber pad overlying the rod and pan. Adjustable lumbar support means between the resilient pad and pan comprises: a support frame mounted on the rod, a manually operable adjustment lever pivotally connected to the support frame and extending across the frame and out through a slot in the backrest pan, a lumbar support member in the form of a generally rectangular resilient flexible forwardly convex grid having its lower edge connected to the support plate and having its upper edge connected to the lever, whereby raising or lowering of the lever causes a decrease or increase, respectively, in the convexity of the lumbar support member and the overlying pad. Interengageable bosses on the frame and the lever and biasing means maintain the lever in selected positions.

Abstract: A vehicle seat comprises a seat assembly including a seat pan and a foam rubber block overlying the seat pan. Seat rake adjustment means are provided to vertically adjust (raise and lower) the forward part of the foam rubber block and comprises: a rake adjustment plate located between the forward part of the seat pan and the foam rubber block, a hinge connecting the rear of the rake adjustment plate to the seat pan, a flange plate connected to and extending downwardly from the rake adjustment plate through a slot in the seat pan, a pair of parallel serrated diagonal slots in the flange plate, and a horizontally shiftable lever at the front edge of the seat pan having a pair of pins which extend through the slots and rest on the seat pan and serve to raise and lower the rake adjustment plate as the lever is shifted.

Abstract: A vehicle seat comprises a seat pan, a backrest pan, and a pair of connector plates connected to opposite lateral sides of the seat pan. Backrest height adjustment means are connected between the connector plates and the backrest pan to enable the backrest pan to be raised or lowered vertically to desired positions relative to the seat pan wherein it then becomes locked.

Abstract: A seat supporting assembly for resiliently supporting a vehicle seat which finds particular utility in tractors or other off-the-road vehicles. The seat supporting assembly includes an adjusting means, readily accessible to the operator and by which he can adjust both the height of the seat and the up-stop limit of the seat. A spring loaded mechanism is provided for the adjusting means which includes a pair of arms that have interengaging means that equalize movement of the adjusting mechanism.

Abstract: A seat supporting assembly for use in vehicles and the like for resiliently supporting a seat. The seat supporting assembly includes a base which is to be secured to the vehicle and a seat support positioned vertically above the base and resiliently supported by a coil spring. The seat supporting assembly also includes a ride height adjustment assembly and an adjustable vertical movement stop assembly for limiting the upward vertical movement of the seat support. The ride height adjustment assembly includes a plurality of pivotable links extending between the coil spring and the seat support. The links are connected by means of a threaded shaft and are relatively movable at their upper ends to cause vertical extension of the height adjustment assembly thereby causing variation in the height of the seat support. The threaded shaft projects forwardly from under the seat support and is readily accessible to the vehicle operator.

Abstract: An adjustable seat suspension system for a vehicle seat for a tractor, earth working equipment, or the like, and in which the seat is resiliently supported by a pressurizable air bag. The seat suspension system provides a manually settable lever by means of which the operator can infinitely vary the height adjustment of the seat for a normal operating position, depending on his size. The seat suspension adjusting mechanism includes a valve for regulating the flow of pressurized air to or from the air bag. The arrangement is such that for any vertical height position selected by the operator, the air controlling mechanism permits the seat to oscillate up and down through a given range of movement, say for example six and one-half inches.