Folded/telescoped drill rig mast for limited space platform

Details Folded/telescoped drill rig mast for limited space platform Folded/telescoped drill rig mast for limited space platform

1987-10-13

1989-06-13

Murtagh, John E.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Tilts relative to base

E04H 1234

Patent

active

048379921

ABSTRACT:
A folding telescoped drill rig mast having wheel assemblies which travel along the power swivel guide rail to guide the telescoped upper mast as it retracts or extends within the lower mast. The fully extended upper mast locks into a transfer frame which moves laterally relative to the lower mast between a first position with the upper guide rail offset from the lower guide rail to a second position with the upper guide rail in longitudinal alignment with the lower guide rail. This lateral movement aligning the upper and lower masts enables pinning the upper and lower masts together to transfer the upper mast loading to the support members of the lower mast. The mast includes a base structure, a lower mast with a guide rail, and an upper mast held within the lower mast. The upper mast includes a guide rail for the power swivel. A dolly wheel assembly mounts to the upper mast and engages the lower guide rail to guide the upper mast as it travels between a first position within the lower mast to a second extended position. A transfer frame at the free end of the lower mast connects rigidly to the upper mast. The transfer frame and the upper mast are moved laterally relative to the lower mast to align the upper and lower masts and the upper and lower power swivel guide rails.

REFERENCES:
patent: 2804948 (1957-09-01), Woolslayer
patent: 3949818 (1976-04-01), Russell
patent: 4366650 (1983-01-01), Patterson
patent: 4371046 (1983-02-01), Read

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