Control device, particularly for automatic furnaces

Details Control device, particularly for automatic furnaces Control device, particularly for automatic furnaces

1981-02-04

1982-10-19

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

With electrothermal-actuating means

361265, 431 66, H01H 6101

Patent

active

043552927

ABSTRACT:
A control device for an automatic furnace comprises a relay (2), whose armature (3) has two independent contact holders (4, 5) and a bimetallic element (6) with a control arm (7). By means of snap switches a contact holder (4), a contact holder (8) for operating an ignition device and a contact holder (9) for disconnecting the control device are connected to control arm (7). The minimum spacing between the two armature parts (4, 5) is defined by a bar (15) on armature part (5). If flame formation fails in the furnace, bimetallic element (6) is energized until the control device is switched off by switching over contact holder (9). If a photoelectric cell controlling the switching on of relay (2) becomes conductive due to outside light during the starting and repetition of the control device, the bimetallic element (6) cannot be disconnected by the locking system formed by bar (15) when the fuel valve is closed. By subdividing armature (3) into two contact holders (4, 5) the adjustment of the control elements is simplified and the use of a lower power relay (2) is made possible, because contact holders (4, 5) are mechanically held in their operating position.

REFERENCES:
patent: 3660005 (1972-05-01), Willson
patent: 3727158 (1973-04-01), Ludi
patent: 3744955 (1973-07-01), Tyler et al.

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