Deep excavator

Details Deep excavator Deep excavator

1993-10-19

1995-01-03

Reese, Randolph A.

Excavating

Clamshell bucket

Contiguous pivots

414718, 414912, 92 61, B66C 2300

Patent

active

053774329

ABSTRACT:
A deep excavator comprising a stretchable arm arrangement having four telescopically assembled alms which are simultaneously extended and contracted for excavating earth or sand to form a deep hole. The stretchable arm arrangement houses therein a working unit comprising a pair of hydraulic cylinders which are arranged in parallel with each other while the cylinder rods thereof are disposed to operate in opposite directions and the hydraulic cylinder housings are assembled so as to relatively slide. The cylinder rods and the cylinder housings are individually coupled each to a respective arm whereby the arms are interlocked with the hydraulic cylinders so as to be extended simultaneously with the hydraulic cylinders when both of the hydraulic cylinders are extended.

REFERENCES:
patent: 2828038 (1958-03-01), Dorkins
patent: 3188917 (1965-06-01), Quayle
patent: 3734464 (1973-05-01), Bushnell, Jr.
patent: 3754666 (1973-08-01), Suverkrop
patent: 3882759 (1975-05-01), Formwalt et al.
patent: 4733598 (1988-03-01), Innes et al.
patent: 4854810 (1989-08-01), Ramsey
patent: 5092733 (1992-03-01), Kishi
patent: 5267824 (1993-12-01), Kishi

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