Method and apparatus for excavating underpinning holes

Details Method and apparatus for excavating underpinning holes Method and apparatus for excavating underpinning holes

1977-03-07

1978-08-15

Crowder, Clifford D.

Excavating

Clamshell bucket

Common pivot

37195, 61 51, 173 43, 173 28, 212 425, B66C 302, E02D 500

Patent

active

041062256

ABSTRACT:
An underpinning excavator which comprises a crane having a horizontal beam and a boom extending angularly upwardly and outwardly above the beam and a digging assembly which includes a vertical rod suspended from the boom and a clamshell digger affixed to the bottom of the rod, the rod being engaged by means on the horizontal beam to move the rod inwardly or outwardly along the beam and to rotate the rod about its own axis to effect the excavation of an opening contiguous to and at least partially under the wall to a sufficient depth to permit underpinning to be installed.

REFERENCES:
patent: 1218826 (1917-03-01), Armstrong
patent: 1507236 (1924-09-01), Humiston
patent: 1518757 (1924-12-01), Reid, Jr.
patent: 2664652 (1954-01-01), Talboys
patent: 2743904 (1956-05-01), Scott
patent: 2822147 (1958-02-01), Allard
patent: 3157235 (1964-11-01), Raizk et al.
patent: 3194329 (1965-07-01), Wallers
patent: 3240278 (1966-03-01), Witwer
patent: 3726349 (1973-04-01), Heusler et al.
patent: 3888317 (1975-06-01), Walters

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