Telescopic drilling derrick apparatus

Details Telescopic drilling derrick apparatus Telescopic drilling derrick apparatus

1988-12-08

1990-06-12

Friedman, Carl D.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Tilts relative to base

52120, 52745, B66C 2300

Patent

active

049321757

ABSTRACT:
A telescopic drilling derrick apparatus that is light for easy transportation and utilizes structure to enable the mast to be raised from a collapsed horizontal position to a vertical position while still in an unextended position and thereafter telescopically raising the mast to full vertical height.

REFERENCES:
patent: 2993570 (1961-07-01), Bender
patent: 3201091 (1965-08-01), Woolslayer
patent: 4134237 (1979-01-01), Armstrong
patent: 4269009 (1981-05-01), Lawrence

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