Patent GB-497861-A (GB)
Title: Improvements in or relating to machines for forming and fixing electrical contacts
IPC: H01H11/04
Filed: 1937-08-05
Abstract: 497,861. Making electric contact springs. ERICSSON TELEPHONES, Ltd., WILMAN, C. W., and TRAPP, C. C. Aug. 5, 1937, No. 21597. Addition to 471,259. [Classes 83 (ii) and 83 (iv)] Riveting; shearing.-A machine according to the parent Specification for applying electric contacts to contact springs for use on relays, switches or like devices is modified by the provision of means for inserting the piece of contact wire into the hole in the contact spring from the side of the spring upon which the contact is to be formed. The machine is similar in general design to that described in the prior Specification. The springs 43 are spaced at intervals of 60‹ between locating pins 6 on an annular carrier ring 5 beneath a rotary turret 1 carrying two sets of four tools 3a .. 3d spaced at intervals of 45‹ and adapted to be operated by rockers 18a. The rear ends and tips of the springs rest on fixed rings 89 and 57 respectively, rotatable anvils 87 being mounted in the ring 57 at each of the two operating stations. In operation each spring is first positioned approximately by setters 11 operated by a rocker 18b, then positioned accurately by a pointed tool 3a which is depressed by a rocker 18a so as to enter one of the holes 46 or 47 into which the container is to be inserted and the spring is then held by a clamp 12, 94 operated by a rocker 18c. The turret is now rotated through 45‹ and the rocker 18a actuates a tool 3b, Fig. 9, so that a short piece of contact wire held within the bore 95 is ejected by a plunger 60 into the hole in the spring. The wire is then riveted over in two stages by the tools 3c and 3d. During the insertion of the pieces of wire into the contact springs fresh wire from drums 36 is led through tubes 73a and 73b and fed by a feed carriage 27, through channels 7 and through holes in a shearing plate 10 which rotates with the turret 1. When the turret next rotates the two pieces of wire within the holes 8 are severed. During the final riveting operation by the tools 3d, the tools 3a are moved downwardly by rockers 18d and rods 13 are moved upwardly to transfer the pieces of wire from the plate 10 to the tools 3a. The rockers 18a .. 18d are operated by cams on a common cam shaft 17. On rotation of the carrier ring the spring which has had one contact fitted is moved into the other operating position where the second contact is fitted. Correct positioning of the two holes 46 and 47 at the two operating stations is obtained by mounting the carrier ring eccentrically with respect to the turret. As in the prior machine the turret is rotated by Geneva mechanism 21, 23 and clutch 25 and the carrier ring by Geneva mechanism 22, 24 and a clutch 26, the clutches being mounted on a shaft 37 and operated by rockers 18e controlled from the cam shaft 17. The wire feeding carriage 27 is looslev mounted on the shaft 2 of the turret. The upward and downward movement of the carriage and also the inward and outward movement of the jaws 28 are controlled by cams 29 mounted on shafts 30 which also control the movement of the rods 13 through cams 83. The shafts 30 are driven through a clutch 31 operated by a rocker controlled from the cam shaft 17.