GB712309A - Improvements in and relating to can openers - Google Patents

Abstract

712,309. Can-openers. SWING - A - WAY MANUFACTURING CO. July 30, 1952 [May 19, 1952], No. 19283/52. Class 66 A can-opener has a base plate 32 adapted to be secured to a wall and which has journalled therein a shaft 74 carrying a serrated drive wheel 70 and a pinion 76 on one side of the base plate 32 and a crank handle 42 on the other side. A cutting wheel 90 and associated pinion 96 are mounted at an angle on a bulge 80 in a carrier plate 78 which is slidably secured to the base plate 32 by means of a rivet 102 and a stud 174. The rivet and stud pass through the base plate 32 and connect carrier 78 to an actuated plate 104. The rivet 102 passes through a slightly inclined slot 64 in the base plate 32 and the stud 174 passes through the lower part of a figureof-eight shaped link which moves in an opening 52 specially shaped to give an over-centre toggle action to the link. The crank handle 42 comprises a drum-like part 118 having inside it a boss 128 carrying a rigid cam 138 and a pivoted spring-loaded dog 156 (see Fig. 10). An actuator pin 114, fixed on the actuated plate 104, lies within the part 118 and co-operates with the cam 138 and dog 156. The can-opener mechanism is in its inoperative position in each. of the Figures shown except Fig. 10, wherein the actuator pin 114 is shown in the operative position. To open a can C (Fig. 7) the top bead thereof is placed on the serrated edge of the drive wheel 70 with its side wall W against a flange 68. Handle 42 is then rotated anticlockwise as seen in Figs. 1, 10 and 11 and the cam 138 (Fig. 11) forces the pin 114 to the left until it reaches'the position shown in Fig. 10 (further rotation of the handle having caused the dog 156 to spring past the pin 114). In moving to the left, pin 114 forces the actuated plate 104 and hence the carrier plate 78 to move also, and cutter wheel 90 is carried down to pierce the top of can C (Fig. 8, not shown). This action also engages pinion 96 with pinion 76. Continued rotation of the handle now rotates the can C and severs the top T therefrom, whereupon the handle is given a short backwards rotation to cause dog 156 to engage pin 114 and force it back into the inoperative position as indicated in Fig. 11. This lifts the cutter wheel 90 and frees the bead of the can C which may then be removed. A small block 148 (Fig. 7) of neoprene is mounted in the boss 128 to buffer the heel of dog 156 and prevent clicking as the dog snaps off pin 114 during each revolution of handle 42.