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. 19, 1990
Filed:
Feb. 08, 1989
Roger L Craft, Emporia, KS (US);
Vektek, Inc., Emporia, KS (US);
Abstract
A hydraulic work support apparatus includes a plunger that is axially movable between a loaded position and an unloaded position and that is adapted to support a compressive load at one axial end thereof. The apparatus also is provided with structure for retaining the plunger in the loaded position, the plunger retaining structure including a tubular sleeve provided with a plunger-engaging segment having a first end adjacent the one axial end of the plunger and a second end remote from the first end. The plunger-engaging segment may be forced radially inward into pressing contact with the plunger to exert a friction force on the plunger which prevents the plunger from moving while in the loaded position. The friction force experienced by the sleeve when pressing contact exists between the sleeve and the plunger has a minimum magnitude at the first end of the plunger-engaging segment and a progressively larger magnitude toward the second end of the segment. The tubular sleeve includes a wall having a thickness which increases between a minimum thickness at the first end of the segment and a maximum thickness at the second end of the segment, the increase in the thickness of the sleeve being representative of the increase in the magnitude of the friction force experienced by the sleeve between the first and second ends of the plunger-engaging segment.