초록 ▼

A spreader unit for controlling a multi-legged stand is presented comprising a hub having a central axis and a plurality of arms hinged to the hub to swing in radial planes with respect to the hub axis. A control shaft is mounted in the hub for rotation about the axis with a reversible gear drive be

A spreader unit for controlling a multi-legged stand is presented comprising a hub having a central axis and a plurality of arms hinged to the hub to swing in radial planes with respect to the hub axis. A control shaft is mounted in the hub for rotation about the axis with a reversible gear drive between the shaft and arms so that rotation of the shaft swings the arms with respect to the hub in unison and vice versa. A control for locking the shaft against rotation with respect to the hub is provided to hold the arms in required spread positions with respect to the hub.

대표청구항 ▼

[ What is claimed is:] [1.] A spreader unit for controlling a multi-legged stand comprising:a hub having a central axis;a plurality of arms hinged to the hub to swing in radial planes with respect to the central axis;a control shaft mounted in the hub for rotation about the central axis;a reversible

[ What is claimed is:] [1.] A spreader unit for controlling a multi-legged stand comprising:a hub having a central axis;a plurality of arms hinged to the hub to swing in radial planes with respect to the central axis;a control shaft mounted in the hub for rotation about the central axis;a reversible gear drive means integrally attached at a lower end of the shaft for engaging each one of the plurality of arms when rotation of the shaft swings the plurality of arms with respect to the hub in unison, and alternatively, movement of one of the plurality of arms rotates the shaft and swings the remaining arms; andcontrol means for locking the shaft against rotation with respect to the hub to hold the plurality of arms in a desired spread position with respect to the hub.