Patent GB-910635-A (GB)
Title: Fully automatic toaster
IPC: H05B1/02
Filed: 1961-01-27
Abstract: 910,635. Bread toasters. SCHLOEMAN A.G. Jan. 27, 1961 [Jan. 28, 1960], No. 3206/61. Class 28 (1). Bread-supporting racks 24, Figs. 6 and 10, moving in wells defined by parallel grill wires 15 of ripple form as in Specification 813,012, are part of a bread carriage downward travel of which into the toasting position is effected by gravity upon electrical energization of motor means, and subsequent upward travel of which is effected by a spring stressed by the motor means after its de-energization. There are heater ribbons 18, Fig. 6, wound on a frame covered with woven fibre glass, and a thermostat 20 like that of U.S.A. Specification 2,667,115 is provided. The bread carriage has lugs 25a, 25b, Fig. 10, sliding on a vertical guide 22 at one or both ends of the toaster. A U-shaped rod 27 as in Specification 810,943 is mounted so that its ends 27a, Fig. 10, and 27b, Fig. 2, have pivotal movement. The end 27a is coupled by a link 28 to the bread carriage, and the end 27b is coupled by a link 29 to a dashpot piston 30, and coacts with a switch 35, 36. A further switch 40, Fig. 10, has a mains-fed central contact 50 actuated from a resilient blade 45 via snap-over spring 51 to close with one or other of contacts 42, 47, Fig. 11, respectively feeding the heater and thermal motor circuits shown. The thermal motor is in two sections 48a, 48b at opposite sides of the toaster and each comprising a zig-zag resistance strip, ends 71, Fig. 10, of which are mounted on a fixed insulator 72, and ends 73 of which are attached to an insulator 74 movable horizontally as the resistance strip sections vary in length with temperature changes, the movements being transmitted by a double magnifying linkage 78, 80, 82 to a bar 86 supported at its ends by the end members 83, 83a of the two linkages. A link 87 connects the bar 86 to a lever 88 having a slot 90 engaging a fixed pivot 89 against the loading of a spring 110. The lever 88 is pivotally connected to the lower retaining cup of a double compression spring 68, the upper retaining cup of which has a spring guide rod 94, with a limit stop 95 preventing complete spring relaxation, and is connected by a lug 98 and a slider 100 to the arm 27a. Operation.-Pivotally attached at 57, Fig. 10, to one bread rack 24 is a lever 56 having at one end a tab 58 which is depressed on insertion of a bread slice into the corresponding well and causes the lever 56 to move against spring loading 63 so that a finger 62 pivoted to the other end of the lever moves the blade 45 to close the contacts 50, 47 and energize the thermal motor 48a, 48b. As the motor expands, the assembly 86 87, 88 moves downwardly as, when the stop 95 comes into action, does the assembly 68, 98, 100, 27a and the rack 24, and the bread is lowered into toasting position. Just before toasting position is reached, an arm 101 on the rack 24 engages a bell-crank 103 to move the blade 45 to close the contacts 50, 42 and initiate toasting. Should the bread carriage jam during downward movement, the slot 90 allows downward movement of the associated end of the lever 88 and a tie-rod 107 attached to this end actuates the bell-crank 103 as above. Once in toasting position, the bread carriage is latched as in Specification 810,944 by a pivoted catch 113 thereon engaging a pivoted platform 119. When toasting is completed the thermostate 20, Fig. 6, which may have a positioning means as in Specification 805,866 for its fixed contact 55, closes its contacts 54, 55, Fig. 11, and energizes a solenoid 124 which against spring loading 122, Fig. 10, attracts a pivoted catch 121 and releases a lever 116 on the platform 119 which tilts and frees the catch 113. Alternatively, the electromagnet may be energized by closing a switch 129, Fig. 11, or the latch 113 may be manually freed. Cooling of the de-energized motor 48a, 48b has meanwhile stressed the spring 68 sufficiently to effect lifting of the carriage to bread-removing position. The thermal motor may be replaced by solenoid or rotary motor means.