Work holders – With fluid means – Cylinder-piston means in series with additional positioning...
Patent
1977-12-27
1979-08-14
Watson, Robert C.
Work holders
With fluid means
Cylinder-piston means in series with additional positioning...
B23Q 308
Patent
active
041643445
ABSTRACT:
The present invention is directed to apparatus for clamping work pieces in which the clamping element is locked in a given position by a novel mechanism comprising at least one dog on a piston connected to the element and one or more recesses defined within a cylinder in which the piston is otherwise movable. In preferred embodiments, the recesses are formed in a base portion which extends into the cylinder and defines the lower limit of axial travel and the clamping position of the piston. A dog is also formed on the upper end of the piston which is engageable with a recess in a cover for the cylinder through which a connecting rod extends. The piston is rotatable within the limits defined by the recess in the cover when the lower dog is withdrawn from the recess in the base, but not otherwise. Hydraulic means are provided to move the piston axially and rotationally between clamping and releasing positions.
REFERENCES:
patent: 3362301 (1968-01-01), Kohlitz
patent: 3572216 (1971-03-01), Seesody
patent: 3948502 (1976-04-01), Waller et al.
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