JPS61120091U

JPS61120091U -

Info

Publication number: JPS61120091U
Application number: JP393985U
Authority: JP
Priority date: 1985-01-14
Filing date: 1985-01-14
Publication date: 1986-07-29

Description

[Brief explanation of the drawing]

第１図は本考案ポンプ装置の一実施例を示す油
圧回路、第２図は同装置の一部切欠正面図、第３
図は同要部の縦断側面図、第４図は従来のポンプ
装置の一例を示す一部切欠側面図である。Ａ，Ｂ，Ｃ〜連通路、１〜基盤、２〜ポンプ、
３〜シリンダ、４〜タンク室、５〜リリーフ弁、
６〜吸入弁、７〜吐出弁、８〜押下部材。 Fig. 1 is a hydraulic circuit showing an embodiment of the pump device of the present invention, Fig. 2 is a partially cutaway front view of the same device, and Fig. 3 is a hydraulic circuit showing an embodiment of the pump device of the present invention.
The figure is a longitudinal sectional side view of the same essential parts, and FIG. 4 is a partially cutaway side view showing an example of a conventional pump device. A, B, C ~ communication path, 1 ~ base, 2 ~ pump,
3 - cylinder, 4 - tank chamber, 5 - relief valve,
6-suction valve, 7-discharge valve, 8-pushing member.

Claims

[Scope of utility model registration request]

A cylinder for lifting and lowering and a pump for supplying hydraulic oil to the cylinder are provided on the same base, while a communication path A between the pump and the cylinder is provided with a discharge valve for supplying hydraulic oil to the cylinder, and a discharge valve for supplying hydraulic oil to the cylinder is provided between the pump and the tank chamber. A relief valve is provided in the communication path B, and a suction valve to the pump is provided in the communication path C that is parallel to the relief valve and connects the communication path B (or tank chamber) to the pump, while the discharge valve 1. A hydraulic pump device comprising a push-down member that opens both the relief valve and the relief valve when a piston on the pump side is lowered over a certain range.