US 1113154 A
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L. a. ODPEMAN. SAFETY DEVICE FOR ELEOTBIOALLY HEA'I ED COOKING APPARATUS.
APPLIOATIOI FILED D20. 23, 1911.
Patented 0cf.6, 1914.
Way 1 Ill/1 [27 7 v)? for oyd. G'raff, Copeman 1m Mam A. V r
UNITED STATES PATENT OFFICE.
LLOYD eaorn-fcoramau, orrmnr, MICHIGAN.
SAFETY DEVICE FOR ELECTRIGAIiLY-HEATED COOKING APPARATUS.
To all whom z't mag concern: j
Be it known that L'LLoYn Gnorr Corn- MAN, a citizen of the United Statesof America, residing at Flint, in the county' of Genesee and State of Michigan, have invented certain new and useful Improvements in Safety Devices for Electricall -Heated Cooking Apparatus,.of which the f bllowing is a specification, reference being had there: in to the accompanying drawin Q T e invention relates to electrically-heats ed cooking apparatus, and it is the object of the invention to guard against dangerous overheating of the apparatus through: the accidental continuance of the electric heat generation when the device is not in luse. Heretofore various have been applied to apparatus of this kind, which are designed to break the electric circm by the mechanical operationpf a switch thermostatically controlled. It is alsp customary to guard the electric circuits by fuses. These do not, however, effectually prevent overheating, for the reason that thermostatic devices are uncertain in their operation and the electric fuses are only blown where there is an abnormal flow of current therethrough.
With the present invention I secure safety by guarding the electric circuits with lowing, A is the cabinet of a fireless cooker,
within the chamber B of which is arranged an electric heating unit C. D is the service conductor for the electric current, and E is an electric switch contro1- ling the same.
Specification of Letters Patent.
Application filed December as, 1911.
'allforms of thermostats that any Patented Oct. 6, 1914. Serial No. 667,531
guarded by a fuse, and these fuses are arranged in separate chambers so as to avoid danger of short circuiting. As illustrated,' is a casing formed of porcelain or other fireproof and electrical insulating material, being of any suitable shape, such, for instance, as an ordinary rosette, G are the electric contacts and H is the fusible connector which is coupled to the contacts and is inclosed between the upper section F of-the rosette and the base F thereof.
In operation the current supply to the heatin unit C normally passes from the leads through the fuses H which are sufficiently low in resistance to avoid any danger of being electrically blown. When however, an abnormal which are of low melting point, will be broken interrupting the current and preventing further heating.
What I claim as my invention is:
In an electrically heated apparatus, the combination with a heat insulated chamber, of an electric heater therein, an electric circuit in which said heater is connected, and a fusible link included in said circuit of sulficiently high electrical conductivity to avoid fusion from internally generated heat and of relatively ing positioned on the opposite side of said chamber from said heater and exposed to heat conducted or radiated from said chamber, and adapted to be fused by an abnormal heating of the contents of the chamber.
In testimony whereof I aflix my signature in presence of two witnesses.
LLOYD GROFF COPEMAN.
EVERE'I'I' L. BEBY.
low fuslng point, said link be-