Title: Hydraulic clamping apparatus

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 The piston is rotatable within the limits defined by the recess in the cover when the lower dog is withdrawn from the recess in the base, but not otherwise.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.

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Inventors: Deragne, Maurice M. (Lyons, FR)

Application Number: 864904
Filing Date: 1977-12-27
Publication_date: 1979-08-14
Assignee:
Primary Class(es): 269/27
Other Classes:
US Patent Ref:

3362301	Jan, 1968	Kohlitz	269/24.
3572216	Mar, 1971	Seesody	92/33.
3948502	Apr, 1976	Waller et al.	269/27.

Other Refs: 2004137320364

Feb, 1971	FR.
Mar, 1972	SU

Primary Examiner: Watson, Robert C.
Assistant Examiner:
Attorney: Dowell & Dowell