| 摘要 |
A wheeled carriage has an upright column with a laterally projecting and vertically adjustable arm thereon. The projecting end of the arm has a dove-tail connector thereon rotatably adjustable in a horizontal plane; a tubular feed screw support has a mating dove-tail part on its bottom side engageable with the connector. The end of the feed screw support has a second dove-tail connector thereon and rotatably adjustable in a vertical plane. A bracket attachable to the motor of an electric drill has a second mating dove-tail part engageable with the second connector with the shaft of the drill chuck aligned with the axis of the tubular support. Two spaced tubular chucks are mounted on opposite sides of the tubular support to receive and releasably lock anchor cables parallel to the drill. The dove-tail parts mating with the connectors have threaded recesses opening normally to connectors; and slots opening laterally and radially into the recesses. Clamp plugs threaded into the recesses each have an axial slot in their periphery and an internally threaded transverse bore aligned with the slot. Locking pins have threaded ends passed through the radial slots in the mating dove-tail parts and the slots in the associated clamp plugs and into the bores, providing 180 degrees clamping adjustment of the plugs against the dove-tail connectors. The pins have tapered mid-sections that will expand the sides of the slots in the plugs and lock the threads on the plugs when the pins are rotated on their axes. A modification interposes a horizontally rotatable connector bar with a mating dove-tail part on its side, and a dove-tail connector on one end, between the arm on the upright and bracket supporting the drill motor. Manual and power driven feed screw supports are disclosed.
|
