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:
Jun. 25, 1991
Filed:
Nov. 16, 1989
Joseph J Zimmerman, Franklin, PA (US);
Joy Technologies Inc., Pittsburgh, PA (US);
Abstract
A hydraulic temporary mine roof support cylinder is disclosed. The support cylinder includes an outer housing and a coaxial intermediate housing member and inner cylinder. A downwardly extending piston is provided between the outer housing and intermediate housing member. In addition, a sleeve piston is provided within the inner cylinder while an inner piston rod is extensible from the sleeve piston. Controls are provided for independently operating the lower cylinder and the upper cylinders. Additionally, a sequence/check valve ensures the timed operation of the upper cylinders. Due to the present design, each of the cylinders may be collapsed within the outer housing.