Hydraulic anti-theft device

Details Hydraulic anti-theft device Hydraulic anti-theft device

1980-12-08

1982-11-23

Peters, Jr., Joseph F.

Motor vehicles

With means for promoting safety of vehicle, its occupant or...

By preventing unauthorized or unintended access or use

70263, 280763, B60R 2504

Patent

active

043600743

ABSTRACT:
A hydraulic anti-theft locking device is provided for backhoes and other construction machines which may be set to render the machines inoperable and incapable of movement. The locking device includes an assembly of rotary flow control valves that must be moved to a particular orientation before the machine can be made operable. In an illustrative embodiment, the control valve assembly is mounted to the extensible stabilizer cylinder of a backhoe. The stabilizer cylinder is extended to raise the tractor wheels off the ground, and the valves are positioned to prevent hydraulic fluid from leaving the load supporting end of the cylinder thereby holding up the rear end of the tractor such that the backhoe cannot be moved. The locking device is easily accessible and provides an easy method for the operator to set his own unique combination for locking the machine to make it inoperable. Attempts to bypass the locking device to make the machine operable would be extremely time-consuming and require tools and equipment not commonly available.

REFERENCES:
patent: 3836173 (1974-09-01), Schwaiger
patent: 3874682 (1975-04-01), Dalton
patent: 4022137 (1977-05-01), Chiu
patent: 4295661 (1981-10-01), Maurer

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