Excavating – Railway graders – Side former
Patent
1987-06-25
1988-12-20
Eickholt, E. H.
Excavating
Railway graders
Side former
414690, 414722, 37141R, E02F 502
Patent
active
047917377
ABSTRACT:
An excavator for use in tunneling operations wherein there is minimal head room, comprising a boom mounted to a mobile carriage for rectilinear movement in a horizontal plane and angular movement in a vertical plane. A rigid arm is pivotally mounted at one end to the distal end of the boom for angular movement relative thereto and a slide is supported by the arm for rectilinear movement thereon. The backhoe is fixed to the slide and there is linkage for manipulating the backhoe.
REFERENCES:
patent: 3056219 (1962-10-01), Jeffrey
patent: 3109248 (1963-11-01), Vos
patent: 3353285 (1967-11-01), Murray
patent: 3789524 (1974-02-01), Mashuda
patent: 4459768 (1984-07-01), Albrecht
Eickholt E. H.
Gammons R. T.
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