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:
Dec. 25, 2012
Filed:
Apr. 11, 2006
Kazuya Imamura, Hiratsuka, JP;
Kuniaki Nakada, Hiratsuka, JP;
Noboru Kanayama, Hiratsuka, JP;
Mitsuo Yabe, Hiratsuka, JP;
Tomoya Watanabe, Hiratsuka, JP;
Teruyuki Hosoya, Koriyama, JP;
Kazuya Imamura, Hiratsuka, JP;
Kuniaki Nakada, Hiratsuka, JP;
Noboru Kanayama, Hiratsuka, JP;
Mitsuo Yabe, Hiratsuka, JP;
Tomoya Watanabe, Hiratsuka, JP;
Teruyuki Hosoya, Koriyama, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A pressure-receiving face plateis mounted on one end face of a piston, and a support memberis raised on the end face of the piston. Disposed on the support memberwith an allowance are, from the pressure-receiving faceplaterespectively, a disk spring, a plate, and a plunger. A flangeprevents these members from slipping off the support member. When the pistonapproaches a stroke end, the plungeris inserted in an oil passageand applies a cushioning effect to the piston. In addition, a gap between the pressure-receiving faceplateand the platebrought into contact with a cylinder bottombecomes narrow, and produces a squeeze effect such that oil escapes from the narrow gap. This makes it possible to provide a hydraulic cylinder that produces a sufficient impact force at the stroke end of the piston and also reduces noise emitted by the impact force, without increasing a length of the hydraulic cylinder.