GB714129A - Improvements in electric toasters - Google Patents

Abstract

714,129. Thermal switches; switches held set and freed mechanically. GENERAL ELECTRIC CO. Oct. 6, 1952 [Oct. 5, 1951], No. 24984/52. Class 38(5) [Also in Group VI] In an automatic toaster of the " pop-up " type, the main switch comprises a fixed contact 89 mounted on a plate 6 and a contact 92 mounted on a spring switch blade 91 carried by the free end of a spring arm 93 so that contact 92 is normally biased towards contact 89. Lever arm 37, by means of which the toast racks are lowered and raised, has an arm 94 which, when the racks are raised, engages an arm 97 secured to the end of the switch blade to hold the switch open. The toasting is timed by a bimetallic element 63 pivoted on a bracket 65 and having its free end resting against, an adjustable screw 66 at the free end of a pivoted arm 67 whose position is controlled by a manually operated lever 70. Element 63 is heated by an insulated winding 74 connected to spaced contacts 75, 76 on insulated brackets 77, 78. A resilient leaf spring 'switch blade 81 having one end fixed carries contact buttons to engage contacts 75. 76 and is biased towards contacts 76 but normally held in contact with contact 75 by an arm 84 which engages the free end of blade 81. Switch arm 84 is pivoted at 85 on post 26 and has a hook 86 at its lower end. On heating, the bimetallic element 63 bows upwards until hook 86 engages under the element, Figs. 3 and 5, and arm 84 moves to allow the contacts on blade 81 to disengage from contact 75 and engage contact 76 thus cutting the windings 74 out of the heating circuit. The element 63 then cools down and, being held by hook 86, its end rises, as it straightens, and engages an arm which releases the toasting racks and hence also opens the main switch breaking the heating circuit. Specifications 714,130 and 714,131, [both in Group VI], are referred to.