Patent ID: 6478172
Filing Date: 2002-11-12
Classification: B66C

Abstract:
A portable lifting device includes:a plurality of telescopic stanchions, each of which is hingedly connected to an appropriate base and comprises a main adjusting screw, providing extension of a lower telescopic stanchion section; a girder, comprising a girder block, and a trolley installed in said girder and including a handle providing shifting and fixation of said trolley along said girder; a frame, including brackets and triangular trusses appropriately connected to each other, and wherein each bracket is rigidly connected to an appropriate bush, through which a main pin, passing through an aperture into a holder and an appropriate aperture into upper telescopic stanchion section of said appropriate telescopic stanchion, connects said frame to an appropriate telescopic stanchion; a winch, comprising an electrical motor and a drum with a hoist cable, and wherein said winch includes a remote switch comprising a switch lever, which during an automatic installation of the assembled lifting device from an initial horizontal position to a vertical working position provides an automatic turn-off of said electrical motor at the moment of contact of said switch lever with a plate connected to a grip: a grip, including a griping screw, a pulley on an axle, and wherein said axle is movable in a slot inside said grip, providing mobility of said pulley at the time of said automatic installation of the assembled lifting device from said initial horizontal position to said vertical working position; a holder, coupling said each of said plurality of telescopic stanchions with said frame and comprising two semi-rings connected to each other; a hook unit, including a hook pulley connected to a hook and coupled with said hoist cable, which is extended from said drum via said pulley, a restrictive block appropriately providing said automatic installation of the assembled lifting device from said initial horizontal position to said vertical working position, said girder block, a block of said trolley to said hook pulley of said hook unit.