B - Operations – Transporting – 60 – P
Patent
B - Operations, Transporting
60
P
138/72.11
B60P 1/16 (2006.01) B23Q 5/00 (2006.01) B66C 23/90 (2006.01) E02F 9/22 (2006.01) E02F 9/24 (2006.01)
Patent
CA 1093937
OVERLOAD PROTECTION APPARATUS FOR HYDRAULIC MULTI-FUNCTION EQUIPMENT Abstract of Disclosure This invention relates to an overload protection apparatus for hydraulic multi-function equipment. It is applicable to equipment sharing a common pressure and return line and in which functional operation of the equipment is interrelated such as to expose certain elements to overpressure conditions. The system includes an overload or overstress valve having a manifold to which the power lines of all of the actuators, except the principal actuator which responds to an overstress condition, are connected. These connections are directed through check valves so that fluid within the lines will be directed only to the overstress valve. A pilot valve connected to the power side of the principal cylinder controls a pressure actuated control valve in the manifold to control and open a passage to the reservoir. Thus, an overpressure condition representing an overstress to the equipment in the principal actuator will operate the pilot valve to unload the pressure lines of the associated actua- tors, thereby preventing their continued operation so long as the overstressed condition continues. This may be relieved by the operator reversing the operation of the motor causing the overstress condition.
318644
Carbert Ralph E.
Ridout & Maybee Llp
LandOfFree
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