| 摘要 |
350,757. Making hinges. BUDD MANUFACTURING CO., E. G., 2500, Hunting Park Avenue, Philadelphia, U.S.A. -(Assignees of Eksergian, C. L. ; 12141, Charlevoix Avenue, Detroit, Michigan, U.S.A.) July 7, 1930, No. 20528. Convention date, July 24, 1929. [Classes 83 (ii) and 83 (iv).] Rolling ; shearing.-Hinges are rolled from heated bar stock by passing the stock, cut to length, between cylindrical rollers 20, 21, one of which carries a die tooth 37 and the other a die pocket 32 as shown in Fig. 2..The blanks are fed into the rollers which bite into the ends 47 of the blanks. The surface of each die is recessed at 22 to a thickness of half the hinge shank and the shank is formed by extrusion of the metal into these recesses. The rollers rotate at the same speed but a differential rolling action is produced by making the roller 21 of greater diameter than the roller 20. The knuckle of the hinge is then formed by the radial movement of the tooth 37 entering the recess 32. During the initial radial movement of the tooth, which forces the end of the blank into the pocket to shape the outside of the hooded knuckle and the ears 19, the blank is anchored by a bulge of metal 48. One side 40 of the tooth 37 is the same shape as the pocket 32 but the other side 43 is cut away as far as a point 41a on the pitch circle 44 of the tooth. As shown in Fig. 3 the inward radial movement of the tooth is a rocking action about the point 41a. In the outward movement which is a rocking action about the pocket edge 56 on the pitch circle 45, the interior of the knuckle is rolled to size as shown in Fig. 7. The pitch circles 44, 45 of the tooth and pocket are equal in diameter and thus the rolling action during the formation of the knuckle is not differential as in the case of the shank. Fig. 13 shows the complete machine in which the bar stock 68 is fed into reciprocating cutting dies 70 operated from an eccentric 71 driven by gearing 72 from the roll axis 62. The severed blanks are dropped on a trackway 73 and are brought up to the rollers 20, 21 by a finger 75 which is oscillated in timed relation to the rollers by means of a cam 77. |
