JPS641879U

JPS641879U -

Info

Publication number: JPS641879U
Application number: JP9693787U
Authority: JP
Priority date: 1987-06-23
Filing date: 1987-06-23
Publication date: 1989-01-09

Description

[Brief explanation of drawings]

第１図および第２図はこの考案の一実施例を示
す打撃装置の縦断面図で、第１図はハンマ上昇状
態を、第２図はハンマ下降状態を示し、第３図は
従来の打撃装置の略示縦断面図である。１……打撃装置、２……シリンダ、３……ハン
マ、４……大径部、５……中径部、７……下降用
受圧面、８……上昇用受圧面、１０……上部室、
１１……下部室、１２……たがね、１４……低圧
室、１５……中径穴、１６……パイロツト室、１
７……下部小径部、２０……シール、３０……切
換弁、５０……高圧管路、５６……低圧管路。 1 and 2 are longitudinal cross-sectional views of a striking device showing an embodiment of this invention. FIG. 1 shows the hammer in the raised state, FIG. 2 shows the hammer in the lowered state, and FIG. 3 shows the conventional striking device. FIG. 2 is a schematic longitudinal cross-sectional view of the device. DESCRIPTION OF SYMBOLS 1...Strike device, 2...Cylinder, 3...Hammer, 4...Large diameter part, 5...Medium diameter part, 7...Pressure receiving surface for descending, 8...Pressure receiving surface for ascending, 10...Upper part room,
11... lower chamber, 12... chisel, 14... low pressure chamber, 15... medium diameter hole, 16... pilot chamber, 1
7... lower small diameter section, 20... seal, 30... switching valve, 50... high pressure pipe line, 56... low pressure pipe line.

Claims

[Scope of utility model registration request]

It is fitted into the cylinder so as to be able to reciprocate in the vertical direction so as to strike a working tool such as a chisel during the downward movement, and has a large diameter portion having a pressure receiving surface for ascending and a pressure receiving surface for descending which is larger in area than the pressure receiving surface. A lower chamber for applying hydraulic pressure to the ascending pressure receiving surface is connected to a high pressure pipe to urge the hammer upward, and an upper chamber for applying hydraulic pressure to the descending pressure receiving surface is connected in relation to the position of the hammer. In the striking device, the hammer is vertically driven by communicating alternately with a low-pressure pipe and a high-pressure pipe by a switching operation of a switching valve that is hydraulically driven. An annular low pressure chamber is provided at a position closer to the working tool of the medium diameter hole into which the continuous medium diameter portions are fitted, and a seal with which the hammer slides is provided at a position further closer to the working tool than the low pressure chamber. At the same time, an annular pilot chamber for operating the switching valve is provided at an intermediate position between the lower chamber and the low pressure chamber of the medium diameter hole, and when the hammer is raised, the pilot chamber and the lower chamber are communicated with each other, and the hammer is lowered. A striking device characterized in that a lower small-diameter portion communicating the pilot chamber and the low-pressure chamber is provided in the middle diameter portion of the hammer, and the low-pressure pipe is connected to the low-pressure chamber.