Title:
AUTOMATICALLY RECIPROCATING CYLINDER DEVICE
Document Type and Number:
Japanese Patent JPS60263707
Kind Code:
A
Abstract:
PURPOSE:To ensure the action of an operating piston, by providing a pushing pilot valve in a pilot hole which serves to connect the alternating pressure chamber of a spool and an oil pressure source to each other, and by providing a pulling pilot valve in an open passage, and alternately operating both the valves. CONSTITUTION:A pushing pilot valve 5 is provided in a pilot hole 4a which serves to connect the alternating pressure chamber 1a of a spool 1 and an oil pressure source to each other. A pulling pilot valve 7 is provided in an open passage 6 which serves to connect the alternating pressure chamber 1a and a drained oil tank to each other. An interlocking mechanism 8 functions so that the pushing pilot valve 5 and the pulling pilot valve 7 are alternately operated by the moving action of an operating piston 3. Since the piston 3 is not moved by the pressure difference between both the sides of the piston, leaking in a cylinder 2 is prevented to ensure the repeated action of the operating piston 3.
Inventors:
SEKI YASUKUNI
Application Number:
JP12011484A
Publication Date:
December 27, 1985
Filing Date:
June 11, 1984
Export Citation:
Assignee:
RIKEN SEIKI KK
RIKEN KIKI KK
RIKEN KIKI KK
International Classes:
F15B11/15; (IPC1-7): F15B11/15
Attorney, Agent or Firm:
Yoshie Shoei