INTERNAL DRAIN TYPE LIFT CYLINDER - KAYABA INDUSTRY CO LTD

Title:

INTERNAL DRAIN TYPE LIFT CYLINDER

Document Type and Number:

Japanese Patent JP2000205207

Kind Code:

A

Abstract:

To attain reduction of working man-hours, reduction of a cost, and even improvement in strength of a piston rod in addition thereto, when an internal drain type lift cylinder is manufactured.

In the point of time when hydraulic oil, leaking from a hydraulic oil chamber 18 to a part 20 between two oil seals 15, 16 provided in a slide contact surface of a piston 5, reaches a prescribed accumulated pressure, for returning the leaking oil to the side of the operating chamber 18, a check valve 22 making the part 20 between these oil seals 15, 16 communicate with the hydraulic oil chamber 18 by a return oil path 21 provided in the piston 5 to have a relief function for this return oil path 21 is interposed.

Inventors:

NIWA SUSUMU
FUJII HIROSHI
KAWAI TATSU

Application Number:

JP617499A

Publication Date:

July 25, 2000

Filing Date:

January 13, 1999

Export Citation:

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Assignee:

KAYABA INDUSTRY CO LTD

International Classes:

F15B15/14; F15B15/22; (IPC1-7): F15B15/22; F15B15/14

Attorney, Agent or Firm:

Amano Izumi

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