Work holders – With fluid means – Cylinder-piston means directly moves jaw
Patent
1987-02-24
1988-04-26
Watson, Robert C.
Work holders
With fluid means
Cylinder-piston means directly moves jaw
B23Q 308
Patent
active
047399805
ABSTRACT:
The invention relates to a hydromechanical tool or workpiece clamping apptus comprising at least one spring clamping cylinder connected to a release conduit and adapted to be hydraulically operated against a spring force to a release position, a pump connected to said release conduit and operable for a release operation, and a discharge conduit extending from said release conduit to a fluid reservoir and including a discharge control element for discharging the pressurized fluid from said spring clamping cylinder to said reservoir after deenergization of said pump. A known clamping apparatus of this type has a solenoid poppet valve disposed in said discharge conduit and operable to close said discharge conduit for the release operation and to be actuated to a flow-through position and maintained therein for the clamping operation. The solenoid valve is expensive and requires separate control means. In contrast thereto, the invention provides the use of a discharge control element in the form of a simple bypass shutter the flow resistance of which at a constant output flow rate of the pump is greater than the pressure required for overcoming the spring force in a release operation.
REFERENCES:
patent: Re30828 (1981-12-01), Budzich
patent: 4523516 (1985-06-01), Foster et al.
Heilmeier & Weinlein Fabrik Fur Oel-Hydraulik GmbH & Co. KG
Watson Robert C.
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