Beam supporter

Abstract

A beam supporter has an upper outer cylinder, a lower outer cylinder, a gearbox connecting these cylinders up an down to each other, and a drive and driven bevels mating one another within the gearbox. A sleeve built in the gear box has an outer periphery integral with the driven bevel, a female threaded inner periphery, and a threaded rod is in mesh with the female thread and extends through the inner periphery. A horizontal shaft of the of the drive bevel protrudes from the gearbox to provide an operable protrusion. A sliding inner cylinder is secured to the rod up and down, so that an upper end of this cylinder slidably protrudes from an upper opening of the upper cylinder. A ring-shaped bearing may be disposed around the threaded rod and vertically slidable above the gearbox. A cap is attached to the threaded rod, so that guide sticks depending through the cap hold the bearing freely slidable up and down but always on or above the feet of the guide sticks. Upper ends of the guide sticks have a stopper above an upper face of the cap so that the sticks are prevented from dropping off the cap.