Patent ID: 6843030

Claim:
A self-lifting vertically rising mast including at least three of a plurality of main frames rigidly connected to each other by main supports, and wherein each of said main frame comprises a base rigidly connected to a left side plate and a right side plate, each of which includes an U-form director comprising an U-slot, and wherein each of the U-form directors is rigidly connected to an appropriate auxiliary director; a lifting shoe inserted into said U-slots of said U-form directors, and wherein an upper surface of said lifting shoe includes a hemispherical cavity; a hydraulic jack 3 installed on said base of said main frame, and wherein an extendable rod of said hydraulic jack is coupled with a lower surface of said lifting shoe; at least two of a plurality of controllable supports, each of which comprises a stand, an extendable screw and a nut fixing the extended position of said extendable screw; a pusher installed in said hemispherical cavity and coupled with said lifting shoe by a bracket and with a sleeve, and wherein said pusher includes at least two of a plurality of rests rigidly connected to said pusher; a hollow upright installed in said sleeve, and wherein inside of said hollow upright is inserted said pusher; a bush comprising a pivotable portion including at least two of a plurality of slots, providing a passage for said rests, and at least two of a plurality of ledges, and wherein said bush is coupled with said pusher; a holder installed between the auxiliary directors to provide a fixation of said upright in the vertical position, and wherein said holder is coupled with said upright by an auxiliary cramp.