JPH0473471U

JPH0473471U -

Info

Publication number: JPH0473471U
Application number: JP11464790U
Authority: JP
Priority date: 1990-10-31
Filing date: 1990-10-31
Publication date: 1992-06-26

Description

[Brief explanation of the drawing]

図面は本考案の一実施例を示すもので、第１図
は油圧工具の正面図、第２図は要部の詳細正面図
、第３図は弁棒進退機構の他の実施例である。１……本体、２……ラム、３……カバー、４…
…握り、５……レバー、６……固定ピストン、７
……サブシリンダ、８……結合金具、９……吸入
弁、１０……吐出弁、１１……切替弁、１１ａ，
１１ｂ……弁座、１１ｃ……通路、１２……リリ
ーフ弁、１３……球、１４……弁棒、１５……ピ
ストン、１６……ばね、１７……通路、Ｐ……プ
ランジヤポンプ。 The drawings show one embodiment of the present invention; FIG. 1 is a front view of a hydraulic tool, FIG. 2 is a detailed front view of the main parts, and FIG. 3 is another embodiment of the valve rod advancing/retracting mechanism. 1...Body, 2...Ram, 3...Cover, 4...
...Grip, 5...Lever, 6...Fixed piston, 7
...Sub cylinder, 8...Joining fitting, 9...Suction valve, 10...Discharge valve, 11...Switching valve, 11a,
11b... Valve seat, 11c... Passage, 12... Relief valve, 13... Ball, 14... Valve stem, 15... Piston, 16... Spring, 17... Passage, P... Plunger pump.

Claims

[Claims for Utility Model Registration] A main body having an open cylinder at one end and a cover at the other end forming an oil chamber a; a body slidably inserted into the cylinder to form an oil chamber c at the bottom; a ram with a cylindrical cavity provided in the ram; a ram protruding toward the center of the cylinder and fixed to the main body;
A fixed piston has an oil chamber b at the bottom and an oil chamber e at the top, and is fitted around the piston to form an annular oil chamber d that can communicate with the oil chamber b, communicating both oil chambers c and e. A sub-cylinder that is removably locked in the cylindrical cavity of the ram, a plunger pump that manually feeds pressure oil to oil chamber b, a passage that communicates from oil chamber b to oil chamber a via a relief valve, and the main body. A valve stem that is movably supported by the cover, a cylindrical grip that is also movably supported by the main body cover and that can control the valve stem to move forward and backward, and a valve that shuts off the oil sent from oil chamber b by moving the valve stem back and forth. or a switching valve that can switch and send oil to oil chambers a and c, respectively; a piston inserted into oil chamber a so as to freely move forward and backward so as to send out oil in oil chamber a; and a piston that constantly sends out oil. A manual hydraulic tool comprising: a spring inserted between the piston and the main body cover to bias the ram in the direction of the ram;