JPS59183495U

JPS59183495U - hydraulic jack

Info

Publication number: JPS59183495U
Application number: JP7788683U
Authority: JP
Inventors: 近藤　茂夫
Original assignee: カヤバ工業株式会社
Priority date: 1983-05-24
Filing date: 1983-05-24
Publication date: 1984-12-06

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の油圧ジヤツキの平面図、第２図は同側面
図、第３図は同断面図、第４図は本実施例に係る油圧ジ
ヤツキの油圧回路図、第５図は同油圧ジヤツキの平面図
、第６図は同側面図、第７図は同断面図、第８図は油圧
通路の配置図である。１０・・・ベース、１２・・・シリンダ、２０・・・タ
ンク室、２２・・・吸込通路、２４・・・吸込弁、２Ｂ
・・・ポンプ手段、４０・・・ラム、４４．４８・・・
油圧室、５８゜６０・・・供給通路、６４・・・遮断弁
、６８・・・排出通路、７０・・・パイロットチェック
弁、７６・・・スプール。Fig. 1 is a plan view of a conventional hydraulic jack, Fig. 2 is a side view of the same, Fig. 3 is a sectional view of the same, Fig. 4 is a hydraulic circuit diagram of the hydraulic jack according to this embodiment, and Fig. 5 is a hydraulic jack of the same. FIG. 6 is a plan view of the jack, FIG. 6 is a side view thereof, FIG. 7 is a sectional view thereof, and FIG. 8 is a layout diagram of hydraulic passages. DESCRIPTION OF SYMBOLS 10... Base, 12... Cylinder, 20... Tank chamber, 22... Suction passage, 24... Suction valve, 2B
... Pump means, 40... Ram, 44.48...
Hydraulic chamber, 58° 60... Supply passage, 64... Shutoff valve, 68... Discharge passage, 70... Pilot check valve, 76... Spool.

Claims

[Scope of utility model registration request]

゛ In a hydraulic jack that extends a ram by inserting a ram into a cylinder erected on a base and supplying hydraulic oil to a hydraulic chamber defined by the lower surface of the ram, the part above the sliding part on the insertion end side of the ram. forming a second hydraulic chamber having a smaller cross-sectional area than the hydraulic chamber with a small diameter portion, and both hydraulic chambers are communicated with each other by an oil feed passage having a cutoff valve interposed therebetween;
A hydraulic jack characterized in that a discharge passage connected to a tank chamber is connected to a first hydraulic chamber side where the ram extends, and is equipped with a pilot check valve that is opened when the shutoff valve is closed.