Vehicle suspension lock system

Details Vehicle suspension lock system Vehicle suspension lock system

1988-10-28

1990-08-28

Marmor, Charles A.

Motor vehicles

Special driving device

Portable track

280 612, 280772, 36442405, B62D 5500, B62D 3700, B60S 9205

Patent

active

049517678

ABSTRACT:
A vehicle suspension lock system for a tree feller-buncher comprising a pair of pivot arms extending transversely from a vehicle frame. Track pods are mounted on the outer end of each pivot arm and a hydraulic cylinder is extensibly disposed between the frame and the pivot arm. A pilot-operated check valve in each cylinder prevents upward movement of the rod in its associated cylinder when the check valve is closed. The pilot port of each check valve is pressurized responsive to hydraulic fluid pressure used to drive the vehicle track pods thereby permitting fluid flow into and between the cylinders when the vehicle is moving and checking the flow from each cylinder when the vehicle is stationary to effect locking of the pivot arms for logging operations.

REFERENCES:
patent: 3687227 (1972-08-01), Reuter et al.
patent: 4236591 (1980-12-01), Molby
patent: 4534575 (1985-08-01), Grove et al.
patent: 4558886 (1985-12-01), Straub
patent: 4580797 (1986-04-01), Ericsson
patent: 4763742 (1988-08-01), Langford
patent: 4823852 (1989-04-01), Langford
patent: 4829436 (1989-05-01), Kowalik et al.

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