Support structures of excavating machines

Details Support structures of excavating machines Support structures of excavating machines

1980-06-27

1983-02-01

Rowland, James L.

Traversing hoists

Having horizontally swinging boom or bridge

Having specific bearing structure

384110, B66C 2384

Patent

active

043710867

ABSTRACT:
In an excavating machine having a lower frame, an upper frame and means for rotatably supporting the upper frame on the lower frame, an assembly for improving the load conditions of the upper frame supporting structure comprising an annular seal mounted on one of the upper and lower frames and disposed in wiping, sealing engagement with the other of the upper and lower frames, forming a sealed chamber between the upper and lower frames, and air is supplied under pressure to the chamber to provide an upwardly directed force on the upper frame alleviating the load imposed on the upper frame supporting structure.

REFERENCES:
patent: 775923 (1904-11-01), Holmes
patent: 3143381 (1964-08-01), Vurpillot
patent: 3708215 (1973-01-01), Wilcock et al.
patent: 3759588 (1973-09-01), Anderson
patent: 3985406 (1976-10-01), Baron
patent: 4076339 (1978-02-01), Schrolucke

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