Patent GB-649631-A (GB)
Title: Improvements in or relating to electric toasters
IPC: A47J37/06
Filed: 1948-12-07
Abstract: 649,631. Electric toasters. MORPHYRICHARDS, Ltd., MORPHY, D. W., and RUSSELL, W. M. Dec. 7, 1948, No. 31642. [Class 28(i)] An electric toaster having a bimetallically-operated timing mechanism for ejecting the toast and de-energizing the main heating elements of the toaster can be manually tripped at any stage of the heating cycle, means being provided whereby upon recharging of the toaster the heating cycle will not recommence until the bimetal strip 79 has cooled down to its automatic tripping temperature. Charging the toaster. In operation a handle 48, Fig. 1, is depressed to lower an arm 64 (upon which freely rest bread-carriers 56, 56) against a spring 63, the arm 64 being held in its depressed position under a claw 132, Fig. 7, on a latch 103 pivoted at 102, the free end 104 of the latch 103 being moved into position under a detent 105 by the arm 64. Lowering of the arm 64 also closes contacts 93, 71 and 94 in the heating circuit, which is, however, only completed when auxiliary contacts 99, 97, Fig. 9, under the control of a lever 112 carrying a stepped-edge cam 114 are closed, as is the case at the start of the heating cycle. The circuit is now closed, and the main heaters and a subsidiary heater for the strip 79 are energized. Heating cycle (Stage 1). After initial stress is taken up in the strip 79 it moves to the right in Fig. 9 until it reaches a step 134 in the lever 112 which lies in a groove in the strip 79, when the lever 112 drops to close contacts 98, 96 and short-circuit the subsidiary heater. Stage 2. The strip 79 hence cools and carries to the left the lever 112 which through the parts 110, 111, swings the detent, 105 about its pivot 106<1> and eventually releases the latch 103 which hence releases the arm 64 to eject the toast and break the heating circuit at contacts 93, 71 and 94. The lever 112 is restored to its original position by the part 127 of a lever' 125 which is rotated clockwise in Fig. 9 about a pivot 126 by a pin carried in the arm 64 as it rises, the auxiliary contacts 99, 97 being reclosed. Adjusting the toasting time. A cam 81, Fig. 7, having a knob 86, enables the time of toasting to be varied by adjusting the distance which a stop-arm 77 forming one leg of a V (the other leg of which is comprised by the bimetal strip 79) must move before the strip 79 starts to move. Recharging before toaster is cool. The toaster may be manually tripped by pressing a button 130 to operate a pin 131. Fig. 9, and swing the detent 105 to release the latch 103. As before, part 127 of the lever 125 is rotated about the pivot 126 to raise the lever 112. Fig. 11, and allow a spring- actuated bell crank 122. which normally follows the strip 79 until a rim 123 on it abuts the edge 124 of lever 112, (see Fig. 10, not showri), to move under the lever 112. The lever 112 is hence maintained in its its raised position whereby auxiliary contacts 99, 97 are held open even if the toaster is recharged, until the strip 79 has cooled sufficiently to move the crank 122 to the left in Fig. 11 to allow the lever 112 to drop. Specification 649,630 is referred to.