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Title:
DOUBLE-ACTING TYPE LIQUID PRESSURE MULTISTAGE JACK
Document Type and Number:
Japanese Patent JPS6040804
Kind Code:
A
Abstract:
PURPOSE:To augment pushing out force without increasing the dimension in the radial direction by providing a liquid chamber in the shaft part of the second cylinder and also providing a piston part, to be received in said liquid chamber, in the third cylinder receiving a piston part in the rear end part of the second cylinder. CONSTITUTION:When pressurized liquid is supplied to a port 74, the liquid is introduced into liquid chambers 74, 66 and liquid chambers 64a, 52a of the shaft part 58 of the second cylinder 44, while the extension force is given to the first cylinder 42 with respect to the second cylinder 44 and also to the second cylinder 44 with respect to the third cylinder 46 respectively, and a jack 40 is extended as a whole. When the pressurized liquid is supplied to a port 86, the liquid is introduced into liquid chambers 64b, 52b, and the liquid pressure in the chamber 52b works as the contraction force to the first cylinder 42 with respect to the second cylinder 44. Further, since the second cylinder 44 obtains the contraction force due to the liquid pressure in the chamber 64b between a piston part 54 of the second cylinder and a piston part 72 of the third cylinder, small size in the radial direction is acceptable for the third cylinder 46.

Inventors:
AKESAKA TOSHIO
Application Number:
JP14804883A
Publication Date:
March 04, 1985
Filing Date:
August 15, 1983
Export Citation:
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Assignee:
ISEKI KAIHATSU KOKI
International Classes:
F15B3/00; B66F3/28; F15B15/16; (IPC1-7): B66F3/28; F15B3/00; F15B15/16
Attorney, Agent or Firm:
Matsunaga Nobuyuki



 
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