| 摘要 |
893,784. Locking nuts and bolts. MACLEAN-FOGG LOCK NUT CO. March 28, 1960 [May 22, 1959], No. 10828/60. Class 89(1). A screwed fastener is formed on its bearing surface with axially-projecting teeth extending across the face, each forming an acute angle with a radius at the outer periphery of the surface. A hexagonal nut 26, Figs. 1, 2, has a flange 28 at one end, the bearing face 25 of which is frusto-conical at an angle v of between ¢ and 12 degrees. The teeth have sharp corners 58, Fig. 14, with substantially vertical faces 57 facing in the direction in which the nut is unscrewed. The edges each extend along an arc of a circle 65 struck on a radius 63 centered at 64 on a circle 66 concentric with the nut axis and spaced so that a radial line 62 is intersected at right-angles by radius 63 at or outside the nut periphery. In a modification, the nut is not flanged and both ends are toothed. In other arrangements, flanged and unflanged bolt-heads have their bearing faces similarly toothed. In yet another arrangement, a countersunk-head screw 47, Fig. 12, has teeth 30f on its bearing face 49 which lies at angle v to the surface of the hole in which it is received.
|
