Telescoping derrick

Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base

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Details

521231, 5274517, 5274518, E04H 1218

Patent

active

054506956

ABSTRACT:
A telescoping four-sided drilling derrick and method of erection that is to be positioned on a drill floor over a well bore and is capable of withstanding severely adverse weather, environmental or geologic conditions. The derrick is in several sections and includes a bottom section, a top section and at least one intermediate section all for superpositioning over the bottom section to form a vertical four-sided tower. Each of the sections is composed of vertical members positioned in each of the four corners of each section to thereby form a total of four faces around the perimeter of each section. A window is one face sufficiently large to receive consecutively therebelow at least one section. In turn each of the intermediate sections is inserted within the bottom section for subsequent serial telescopic raising of the intermediate sections. Thereafter support means is connected across the window after the last intermediate section has been received within the bottom section so as to substantially close the window and rigidify the bottom section to enable the bottom section and the derrick to withstand the stress imposed by the superposed sections and any severely adverse conditions.

REFERENCES:
patent: 1299261 (1919-04-01), Taylor
patent: 1644499 (1927-10-01), Trout
patent: 3185265 (1965-05-01), White
patent: 4885893 (1989-12-01), Wasterval, Jr. et al.
patent: 5216867 (1993-06-01), Wasterval, Jr. et al.

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