The upper jaw is formed with a circular
flange on which is mounted the circular or disk-like base, C, of the
drill frame, D. This, with the frame, is secured on the jaw of the tongs
by means of two screw bolts--one seen in the engraving--passing through
the jaw and screwing into the base of the drill. These bolts pass
through semi-circular or segmental slots, by which the drill frame can
be swung around at different angles to the tongs, to adapt itself to the
convenience of the workman and the requirements of the work. If desired,
the crank by which the drill is driven may be used on the upright
spindle, E. It will be seen that the pivoted base or bed, B, will allow
the work to adapt itself always to the line of the drill.
In operation, the work being placed between the drill and platen, the
left hand presses the handles of the tongs together, while the right
turns the crank; the feed is thus graduated wholly by the pressure of
the hand. No further description is required for understanding the
construction or operation of this tool. Patented by F. Nevergold and
George Stackhouse, June 19, 1866.
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