초록 ▼

This invention is an electrically powered movable elevator device comprised of a base mounted on wheels upon which is mounted a substantially vertical hollow support member through which a screw passes. A support nut attaches to a platform and engages the screw. An electrical control system attached

This invention is an electrically powered movable elevator device comprised of a base mounted on wheels upon which is mounted a substantially vertical hollow support member through which a screw passes. A support nut attaches to a platform and engages the screw. An electrical control system attached to the platform allows a person standing thereon to be raised or lowered by the rotation of the screw. A reversible electric motor is belt-coupled to the screw which may be made to rotate in either direction, by the electrical control system.

대표청구항 ▼

A movable elevator device comprising in combination: a base member; wheel means attached to said base member; said wheel means being comprised of, in combination: a wheel support member adjustably extending within said base member; a wheel rotatably attached to wheel support member; braking means co

A movable elevator device comprising in combination: a base member; wheel means attached to said base member; said wheel means being comprised of, in combination: a wheel support member adjustably extending within said base member; a wheel rotatably attached to wheel support member; braking means connected to said wheel; a clamping screw extending through said base member and bearing against said wheel support member; an electric motor adjustably attached to said base member; a substantially vertical screw rotatably coupled to said electric motor; a hollow screw enclosing member attached to said base member and enclosing said screw; a support nut rotatably engaged with said screw; an inner slide connected to said support nut and in sliding contact with the interior surface of said screw enclosing member; a foot platform attached to said inner slide; a control arm connected to said foot platform; an adjustable shelf means connected to said control arm; said adjustable shelf means comprised of, in combination: a shelf having a sleeve thereon, said sleeve encircling said control arm; a thumb screw extending through said sleeve to bear against said control arm; an elevator control switch attached to said control arm and in electrical contact with said electric motor; and a power source connected to said elevator control switch.