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:
Feb. 13, 2001
Filed:
Nov. 20, 1998
Mitsuo Noda, Ichinomiya, JP;
Akiyoshi Horikawa, Kodaira, JP;
Howa Machinery, Ltd., Nagoya, JP;
Abstract
The elastomer dampers are disposed at both ends of the actuator cylinder in order to stop the piston moving in the cylinder at its stroke ends. The elastomer damper includes a pair of the protruding portions which abut the piston at its stroke end. The protruding portion has an tapered shape in which the cross sectional area thereof gradually decreases from the base to the top. Therefore, when the piston abuts the protruding portions and compresses the protruding portions, the braking force exerting on the piston gradually increases without sudden change. Therefore, the piston decelerates smoothly at its stroke ends. Further, since the top surface of the protruding portion is formed as a flat plane and the top surface is connected to the tapered side surface of the protruding portion by a round surface, no stress concentration occurs at this portion. Therefore, cracks or breakage of the material do not occur in the top surface even after a long operating time of the actuating cylinder.