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:
Sep. 25, 1990
Filed:
Nov. 04, 1988
Kouji Yamaguchi, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A hydraulic differential cylinder comprises a cylinder, a piston slidably fitted in a cylinder chamber, a piston rod with one end coupled to said piston and an inner valve disposed in said piston rod. The cylinder chamber is divided by the piston into a rod-side cylinder chamber and a head-side cylinder chamber. The piston-pressure-bearing area of the head-side cylinder chamber is greater than the piston-pressure-bearing area of the rod-side cylinder chamber. The rod-side cylinder chamber is connected via the inner valve to a constant hydraulic pressure source. The head-side cylinder chamber is connected to a control hydraulic pressure source. The inner valve has means for communicating the constanbt hydraulic pressure source with the rod-side cylinder chamber when the hydraulic pressure of the working fluid supplied from the control hydraulic pressure source to the head-side cylinder chamber is lower than a critical hydraulic pressure, and for shutting off the communication between the constant hydraulic pressure source and the rod-side cylinder chamber and for communicating the rod-side cylinder chamber with a drain when the hydraulic pressure of the working fluid supplied from the control hydraulic pressure source to the head-side cylinder chamber is higher than the critical hydraulic pressure.