Method of positioning a transfer arm

Details Method of positioning a transfer arm Method of positioning a transfer arm

1986-12-31

1987-11-24

Spar, Robert J.

Material or article handling

Apparatus for moving intersupporting articles into, within,...

Stack forming apparatus

91508, 175 85, 414 22, 414680, 414745, E21B 1914

Patent

active

047085819

ABSTRACT:
A drilling apparatus of the type having a drilling mast and a transfer arm mounted at a first axis adjacent the mast to move between a lower position near ground level and an upper position aligned with the mast is provided with a reaction point anchor fixed with respect to the drilling mast and spaced from the first axis. A fixed length link is pivotably mounted to the transfer arm at a second axis, spaced from the first axis, and a first single stage cylinder is pivotably mounted at one end to the distal end of the link and at the other end to the transfer arm. A second single stage hydraulic cylinder is pivotably mounted at one end to the distal end of the link and at the other end to the reaction point.

REFERENCES:
patent: 3177944 (1965-04-01), Knights
patent: 3633771 (1972-01-01), Woolslayer et al.
patent: 3682259 (1972-08-01), Cintract et al.
patent: 3700222 (1972-10-01), Baxter et al.
patent: 4407629 (1983-10-01), Willis
patent: 4547110 (1985-10-01), Davidson

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