ˈking-bolt
A main or large bolt in a mechanical structure. a. An iron rod in a roof, used instead of a king-post. b. A vertical bolt passing through the axle of a carriage or railway car, and forming a pivot on which the axle swings in taking curves. c. A bolt from which the cage of a mining shaft is suspended.
| 1825 J. Nicholson Operat. Mechanic 563 Constructed with one king-bolt in the middle. 1874 Knight Dict. Mech. 839/2 The king-bolt is the center of oscillation, and the fifth-wheel forms an extended support to prevent the careening of the carriage-bed. 1882 Rep. to Ho. Repr. Prec. Met. U.S. 591 As soon as these arms become engaged and fixed in the guides, the whole weight of the cage is transferred to the king-bolt by which it is suspended. 1888 C. F. Mitchell Building Constr. i. ix. (1889) 129 Feet of King or Queen Bolts. These may pass through cast-iron sockets which are indented into the tie-beam. |