Hydraulic clamp

Details Hydraulic clamp Hydraulic clamp

1987-11-12

1989-05-02

Watson, Robert C.

Work holders

With fluid means

Cylinder-piston means in series with additional positioning...

269 94, 269234, 269 93, B23Q 308

Patent

active

048261467

ABSTRACT:
A hydraulic clamp for dies of injection molding machines, workpieces of machine tools such as press machines and the like.
In the front part of its housing a clamp arm is installed to be longitudinally movable and vertically pivotable and a hydraulic cylinder in the rear part thereof, and there is formed in at least either of a piston rod and the clamp arm a longitudinally extending hole for accommodating a clamp arm pushing spring. An engaging means is provided for engaging the clamp arm with the piston rod at substantially same level with the clamp arm pushing spring. When the hydraulic cylinder is driven to extend, first the clamp arm is pushed forward by the clamp arm pushing spring and, when it is extended, a projected end portion of the clamp arm is pivoted down by the force-magnifying effect of a driving wedge interlockingly connected with the piston rod. When the hydraulic cylinder is driven to retract, first the driving wedge withdraws to allow the clamp arm to pivot upward and then it retracts accompanying the piston rod via the engaging means.
Also provided is a clamping force holding spring set in a clamping hydraulic chamber pre-assembled with a longitudinally extendable/retractable rod.
Another function provided is to detect the extended or retracted condition of the clamp arm, which is feasible by connecting interlockingly rods for detecting the position of the clamp arm and trigger either limit switch accordingly.

REFERENCES:
patent: 4365792 (1982-12-01), Johns
patent: 4504046 (1985-03-01), Yonezawa et al.
patent: 4506871 (1985-03-01), Yonezawa

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