Self-lifting vertically rising mast

Details Self-lifting vertically rising mast Self-lifting vertically rising mast

2005-01-18

2005-01-18

Slack, Naoko (Department: 3635)

Static structures (e.g., buildings)

With lifting or handling means for primary component or...

Mast or enclosure section elevated to superimposed position

C052S121000, C052S745170

Reexamination Certificate

active

06843030

ABSTRACT:
A self-lifting vertically rising mast provides a possibility to be erected without use of high cranes. An improved self-lifting vertically rising mast includes at least three of a plurality of main frames and at least three of a plurality of main supports, wherein each main frame is rigidly connected to the appropriate main support and comprises the base, U-form directors, lifting shoe inserted into the U-slots of the U-form directors, the hydraulic jack installed on the base of the main frame, pusher including the rests, hollow upright leant on the sleeve of the bush, comprising the pivotable portion having the slots providing passage for the rests, the pair of the guiding shoes longitudinally movable along the auxiliary directors, the holder located between the auxiliary directors and fixing the appropriate upright in the vertical position, and the controllable supports, comprising the stand, the extendable screw, and the nut, which fixes the desirable position (extension) of the extendable screw.

REFERENCES:
patent: 2794242 (1957-06-01), Evers et al.
patent: 3673754 (1972-07-01), Murashige et al.
patent: 3945107 (1976-03-01), Houck
patent: 5794387 (1998-08-01), Crookham

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