Apparatus for operating working element of excavator

Details Apparatus for operating working element of excavator Apparatus for operating working element of excavator

1985-12-30

1987-08-18

Eickholt, E. H.

Excavating

Railway graders

Side former

414694, E02F 502

Patent

active

046867821

ABSTRACT:
An apparatus for the operation of a working element of an excavator. An arm connected to the working element and a boom for supporting and operating the arm are fabricated each in the shape of a hollow tube whose opposite ends are left unclosed. A boom cylinder, an arm cylinder, or a working element cylinder is disposed as contained within the boom or the arm. The point of connection of the boom to the arm and the point of connection of the working element cylinder to the arm constitute a joint fulcrum. The point of connection of the boom cylinder to the boom and the point of connection of the arm cylinder to the boom similarly constitute a joint fulcrum.

REFERENCES:
patent: 3042233 (1962-07-01), Wills
patent: 3057494 (1962-10-01), Holupainen et al.
patent: 3148788 (1964-09-01), Ferwerda
patent: 3339763 (1967-09-01), Caywood et al.
patent: 3390794 (1968-07-01), McMullen et al.
patent: 3532234 (1970-10-01), Grant
patent: 3554395 (1971-01-01), Dunbar
patent: 3578188 (1971-05-01), Drieschner
patent: 3653131 (1972-04-01), Pilch
patent: 4069637 (1978-01-01), Braithwaite
patent: 4553899 (1985-11-01), Magni

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