Dog.
A hold-fast. A device with a tooth which penetrates or grips an object and detains it. The analogy and inference of the name is that the device has a tooth and bites. |
| Dogs. |
1. (Pile-driving.) A grappling iron or grab, usually with jaws, and adapted to raise the monkey of a pile-driver. When the jaws open, the object is dropped or released. See pile-driver.
2. (Well-boring.) A grab for clutching well tubes or tools, in withdrawing them from bored, drilled, or driven wells. See grab.
3. (Turning.) A clamp fastened to a piece suspended on the centers of a lathe, and by which the rotation of the chuck or face-plate is imparted to the piece to be turned (a b, Fig. 1679). 4. A click or pallet adapted to engage the teeth of a ratchet-wheel, to restrain the back action. A click or pawl. See windlass; ratchet.
5. (Machinery.) a. The converging set screws which establish the bed-tool of a punching-press in direct coincidence with the punch. b. A contrivance for holding the staff to the rest, chuck, or carriage, while being cut, sawed, planed, or drilled. c. An adjustable stop placed in a machine to change direction of motion, as in the case of feed-motion, or in jacking, shaping, or planing machines.
6. (Hoisting and Hauling.) a. A grappling-iron (c) with a fang which is driven into an object to be raised or moved. In the continuous system of feed in saw-mills, the chain has a number of dogs attached to different portions of its length. Dogs are also used for securing and towing floating logs and in shifting or loading logs on the ground or carriage. 6. A ring-dog or span-dog (d); two dogs shackled together by a ring, and used for hauling or hoisting. c. Sling-dogs (e); two dogs at the end of a rope and used in hoisting barrels. A span-shackle. 7. A bench-dog (f) is a clamp, and holds the timber by its tusk.
8. (Sawing.) A rod on the head or tail block of a saw-mill carriage, by which the log is secured in position. The dog (g) is pivoted to the block, and its tooth is driven into the log. It varies in form on the head and tail blocks respectively. In h and i respectively are shown other forms of the saw-mill dog. See also circular saw; headblock.
9. (Shipbuilding.) The last detents or supports knocked away at the launching of a ship. A dogshore.
10. (Locksmithing.) A projection, tooth, tusk, or jag in a lock, acting as a detent. Especially used in tumbler-locks. 11. An andiron.
