Patent GB-689971-A (GB)
Title: Improvements in or relating to electric incinerators
IPC: F23G5/10
Filed: 1949-10-20
Abstract: 689,971. Electric incinerators. CHAP-' PELL, H. H. Jan. 19. 1951 [Oct. 20, 1949], No. 26938/49. Class 39(iii) An electric incinerator comprises at least one bare electric heating element 46 supported in a combustion chamber 21 in a casing 11, 12, and a step-down transformer 113 to the secondary of which the elements 46 are connected. The casing comprises walls, as at 11, 12, on a framework of upright corner-members 14 and cross-members 15, a horizontal asbestos partition 16 dividing the casing into a compartment 1, into which can be slidden the chamber assembly 21, and a compartment 2 housing the electrical controls and some of the mechanical linkage. The chamber 21 has front, back and side walls as 27, 31 and 22 respectively, leading to a chimney 26, an ash-pan 45 being slidable on the bottom plate to the chamber which also has a flap 29 comprising spaced arcuate plates 35<SP>1</SP>, 36<SP>1</SP> carried by two side members, as 33, pivoted about a shaft 35. Above the flap 29, in the front wall 11 of the casing, is a door 39 pivoting about a shaft 43, and below the flap is a shoot 51 for directing articles to be burnt on to the elements 46, which are disposed in V formation between refractory supports 47 attached to the side walls of the chamber 21. The operation of the device is as follows: A foot pedal 53, pivoting about 54, is depressed to raise a link 60 which is connected through a bell-crank lever 63 and links 74 and 76 to the shaft 43 which is rotated to open the door 39. A pin 61 on the link 60 simultaneously raises a counter-weighted lever 62, and a pin 59 on the pedal 53 pivots a lever 80 about 81 to lower a link 84 and close a contact 91 on a time-switch 92 which is in series with a switch 100 in a control circuit which is responsible for actuating the main switch to the heaters 46. To ensure that the control circuit is not energized until the door 39 is closed, pivoting of the lever 80 is arranged to open the switch 100 through pin 93, lever 95 which pivots about 96, and stud 98. The pedal 53 is now released, the link 60 is lowered and a pin 72 on the lever 63 engages a bell-crank lever 66 to rotate it about 64 and hence through a link 71 rotates the shaft 35 to open the flap 29. Simultaneously the counter-weighted lever 62 falls to close the door 39. As the link 60 reaches its lowest, original position, the pin 72 disengages the lever 66 to permit the flap 29 to close by gravity, and a second pin 73 on the lever 63 engages a slot 77 in a fixed plate 78 to prevent opening of the door 39 by hand. It is now merely necessary to arrange for the elements 46 to be energized, and this is achieved by the lowering of the lever 80 consequent on the fall of the link 60 to close the switch 100. The time-switch 92 remains closed after the rise of the link 84 and hence the control circuit is closed to energize a coil 105 and rotate a lever 101 about 102 to disengage the link 60 from the pedal 53 to prevent effective operation of the pedal 53 during combustion. The control circuit actuates the main switch to supply current to the elements 46 and illuminate a pilot lamp 115. After a predetermined time the switch 92 opens, the control circuit is broken and hence the coil 105 is de-energized to permit the link 60 to re-engage the pedal 53, the main switch is consequently opened to de-energize the elements 46, and the cycle of operations can be repeated.