The Lazy-tongs consists of (4) long arms (a), (4) lever-arms (a), (4) short arms (a), upper assembling-bolt, (2) assembling-bolts, short, (2) assembling-bolts, long, central journal-bolt (e), lower journal-rod (b) and (2) bearing-boxes, (2) eye-washers (for strap k), and the necessary nuts and washers.
The front end of the frame is attached to the carriage axle-plates, just in rear of the middle transom, by two eye-bolts which form the pivot.
Fig. 60.
The rear end is attached to the elevating-screw by the cross-head elevating-screw nut, which moves back and forth in the grooves in the side-levers in rear of the transom-bolt. The crank-handle on the elevating-screw is located just in front of the trail-box.
The double lazy-tongs (of two cells, the upper twice the size of the lower) are enclosed in the frame which furnishes bearings, at about the middle of the side-levers, for the central journal-bolt.
The lower journal-rod has fixed bearings in the two bearing-boxes which are bolted to the flasks of the carriage.
The gun rests on the upper assembling-bolt, which has eye-washers for the breech-strap.
Any motion of the elevating-screw handle raises or lowers the frame, and this, carrying with it the central journal-bolt, opens out or closes the lazy-tongs cells.