Working machine with improved jib section

Excavating – Snow or ice removing or grooming by portable device – Railway clearer

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414685, 414722, E02F 376

Patent

active

043554776

ABSTRACT:
A working machine which is intended for demolishing and excavating work comprises a chassis, an upper part carried by said chassis and arranged for rotational movement relative thereto about a vertical axis, and an arm arrangement carried by the upper part and including a jib structure which is connected at one end thereof to the upper part and the other end of which carries, via an intermediate arm, a fitting for a tool, such as an excavator bucket, a chiseling device or like tool. The jib structure and the intermediate arm are connected to the upper part and to each other respectively via pivots and can be pivoted in a vertical plane by means of first and second pressure piston-cylinder devices active between the upper part and the jib structure and between the jib structure and the intermediate arm respectively. The jib structure is divided into a first, short jib section which is pivotally connected to the upper part, and a second, longer jib section which is pivotally connected to the first jib section. The first jib section is connected to the first pressure cylinder device, while the second jib section is connected to the second pressure cylinder device. Further, the jib sections can be pivoted relative to one another in the vertical plane by means of a further pressure cylinder device acting between the jib sections; whereat a given one of said first and said further pressure cylinder devices can only be driven together with the other; and whereat the arrangement of the first and the further pressure cylinder devices is such that when they operate simultaneously they swing the jib sections at the same angular speed in opposite directions.

REFERENCES:
patent: 2768760 (1956-10-01), Pilch
patent: 3237795 (1966-03-01), Kromer
patent: 3441155 (1969-04-01), Norton
patent: 3584751 (1971-06-01), Bellart
patent: 3794191 (1974-02-01), Kuhn
patent: 3802586 (1974-04-01), Lofgreen
patent: 4077140 (1978-03-01), Branconi
patent: 4257732 (1981-03-01), Staffanson

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