The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1988
Filed:
Dec. 29, 1986
Leon Malashenko, Toronto, CA;
John T. Hepburn, Limited, Mississauga, CA;
Abstract
A hydraulic press has a frame including a crosshead formed with a vertical passage. A lower platen is fixed to the base of the frame, and an upper movable platen is located between the crosshead and lower platen. Light-duty hydraulic cylinders move the upper platen between an operating position proximate to the lower platen and a retracted position relatively distant from the lower platen. A short-stroke, large-bore hydraulic ram extends vertically from the upper platen and travels with the upper platen is positioned by the light-duty cylinders. An upper free end of the ram locates in the vertical passage of the crosshead when the upper platen is in its retracted position but clears the passage when the upper platen is in its operating position. A hydraulic mechanism then closes the passage so that the ram can drive the upper platen towards the lower platen. The length of the ram can be varied with mechanical spacers which seat in a recess formed in the upper end of the ram to adjust platen clearance in the operating position in order to accommodate molds or other workpieces of different heights.