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. 17, 2004
Filed:
Feb. 13, 2002
Takayuki Kawakami, Itami, JP;
Pascal Kabushiki Kaisha, Hyogo, JP;
Abstract
A hydraulic cylinder ( ) moves a rod ( ) in the direction of the axial center. The interior of a casing member ( ) has an annular pressure booster ( ) for pressurizing the oil in an external hydraulic chamber ( ). The casing member ( ) has a pressurized oil feed port ( ) for feeding pressurized oil to the rod-moving hydraulic cylinder ( ) and the input oil chamber ( ) of the pressure booster ( ). A throttle valve ( ) is interposed in an oil supply channel extending from the pressurized oil feed port ( ) to the input oil chamber ( ). An oil discharge channel, extending from the input oil chamber ( ) to the pressurized oil feed port ( ), is provided with a nonreturn valve capable of discharging pressurized oil from the input oil chamber ( ). The nonreturn valve ( ) is opened when the pressurized oil is discharged through the pressurized oil feed port ( ). The resulting hydraulic lock device is exceptionally dependable and reliable, operating at a high output with a small size and low-pressure hydraulic supply source.