Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1982-03-24
1984-05-01
Schmidt, Frederick R.
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
269 94, 269238, 269 93, 74105, 74470, B23Q 302
Patent
active
044456760
ABSTRACT:
A fluid-operated clamping device comprises a support forming a cylinder in which a piston is reciprocatable. A piston rod fixed to piston has a free end projecting beyond the cylinder. A bell crank is pivotally mounted on a portion of the support extending beyond the cylinder. A clamping arm is preferably releasably connected to one arm of the bell crank and has a V-shaped end portion extending transverse to the remainder of the clamping arm adapted to clamp a sheet metal or the like between the V-shaped end portion and a matching V-shaped notch on the upper surface of a stationary anvil. A link comprising at least one spring plate partly divided by a preferably T-shaped slot extending from one side thereinto into two resilient end portions is arranged between the free end of the piston rod and the other arm of the bell crank with one end portion pivotally connected to the free end of the piston rod and the other end portion pivotally connected to the other arm of the bell crank. The springy link will not only permit construction of the device with relatively large tolerances, but will also prevent excessive clamping forces during operation of the device.
REFERENCES:
patent: 3170214 (1965-02-01), Cochrane
patent: 3388611 (1968-06-01), Clary et al.
patent: 4240620 (1980-12-01), Tunkers
Schad Steven P.
Schmidt Frederick R.
Striker Michael J.
Tuenkers Maschinenbau G.m.b.H.
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