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:
Mar. 21, 2000
Filed:
Nov. 09, 1998
Tamotsu Nakamura, Saitama, JP;
Showa Corporation, Saitama, JP;
Abstract
A tilt cylinder device has an exterior oil passage 61 outside a cylinder 51 for bringing oil chambers S6 and S7 into communication with each other, the exterior passage 61 is provided with a pump 72 and a control valve 73. A piston 13 is formed with a communication passage 34 for bringing oil chambers S6 and S7 into communication with each other. The communication passage 34 is provided with a first relief valve 15 which opens when a pressure in the rod side oil chamber S6 exceeds a set pressure. A hollow piston rod 14 is provided therein with a delay mechanism 16 for delaying the closing operation of the first relief valve 15 by pushing a valve body 15b of the first relief valve 15 in its valve opening direction for a predetermined time period after the relief valve 15 is opened.