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:
Apr. 25, 1989
Filed:
Nov. 25, 1987
Ingo Hirschkorn, Neu Wulmstorf, DE;
Abstract
The extruder head has a hydraulic cylinder for the movable upper head member and/or the movable lower head member attached to each side of a stationary head member rigidly whose piston rod is extendable in the direction of the movable head member. Between the free ends of the piston rods and the associated movable head member there is provided a releasable connection means under tension. This connection means comprises at least two radial projections on the piston rod distributed uniformly about the circumference of the piston rod and a passage corresponding to the shape of the projection with a contacting surface in and/or on the associated head member. To loosen or release the connection means the piston rod is rotated about half a partial angle determined by the number of projections.