Spring devices – Vehicle – Compound
Patent
1974-06-21
1976-02-03
Marbert, James B.
Spring devices
Vehicle
Compound
267 64R, B60G 1156
Patent
active
039360393
ABSTRACT:
A load-levelling shock absorber unit including a guide piston and piston rod and a first surrounding ride control cylinder, one of which is adapted to be connected to a first sprung mass and the other of which is adapted to be connected to an unsprung mass; an oil reservoir cylinder surrounding the ride control cylinder; and an expansible lift cylinder. The ride control, oil reservoir and lift cylinders are all preferably concentrically arranged and are of the hydraulic type. The piston rod reciprocates within the ride control cylinder and, so long as the piston is centrally positioned within the first cylinder, a lagged control valve does not displace sufficiently to allow repositioning of the outer wall of the lift cylinder. Movement of the piston beyond a predetermined central portion for a predetermined time period will move the control valve such that further reciprocation of the piston rod will reposition the outer wall of the lift cylinder so that a spring attached thereto and to one of the masses is moved within the first cylinder, until the over-all shock absorber length is substantially re-established.
REFERENCES:
patent: 2918273 (1959-12-01), Whisler et al.
patent: 3332677 (1967-07-01), Long, Jr.
patent: 3353813 (1967-11-01), Erdmann et al.
Marbert James B.
Tropic Industries, Inc.
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