Vehicle seat having valve controlled air spring

Details Vehicle seat having valve controlled air spring Vehicle seat having valve controlled air spring

1975-02-18

1976-04-20

Schultz, William H.

Supports

Stand

Standard type

248157, A45D 1904

Patent

active

039513734

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. In addition to a normal operating oscillation range for any selected height adjustment, the seat suspension control system of the present invention includes a floating pivot point in the control linkage which can shift from its normal operating position to thereby in effect disconnect the control valve and protect it when the seat movement exceeds the limits of the valve spool, which limits are small compared to overall linkage movement requirements.

REFERENCES:
patent: 3325136 (1967-06-01), Radke et al.
patent: 3599232 (1971-08-01), Tabor
patent: 3727974 (1973-04-01), Swenson et al.
patent: 3765639 (1973-10-01), Mystrom
patent: 3814370 (1974-06-01), Havrwitz

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