US1422735A - Automatic means for controlling electrically-heated devices - Google Patents

Description

A. F. BROWN AND L. B. BURCK. AUTOMATIC MEANS FORECONTROLLING ELECTRICALLY HEATED DEVICES. "f

v I APPLICATION FILED JAN. I6, 1918. I

1 422 735 Patented J uly 1 1;,1'922.

ATTORNEY WITNESSES UNITED STATES PATENT OFFICE.

ALBERT FRANKLIN BROWN, or LOS ANGELES, AND LAWRENCE BURROUGHS 311301;,

01? PASADENA. CALIFORNIA.

AUTOMATIC MEANS FOR CONTROLLING ELECTRICALLY-HEATED DEVICES.

Specification of Letters Patent.

Application filed January 16, 1918. Serial No. 212,091.

To all whom it may concern? Be it known that We, ALBERT FRANKLIN BROWN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and States of California, and

Means for ControllingElectrically Heated f Devices;

Our invention relates to the automatic control of such heat Wherever and in any manner in which it may be used, in any article, machine, or device, using, generating or storing heat generated by electricity, wherein it is desirable or necessary to maintain a uniform temperature of any degree or intensity desired. j

We attain these objects by the mechanism illustrated in the accompanying drawings, in'which our invention is applied to an ordinary electric fiat iron, in which drawings Fig. 1 is a vertical section of an iron showing our device attached to same; Fig. 2 is an end view of the same iron showing our device attached as appears from the exterior; Fig. 3 is a horizontal section showing our device asapp-lied to a flat iron, a-

portion of the casting being broken away, and Fig. 4 isa detail view, chiefly in vertical section, showing the mounting of the contact elements.

In carrying outthe invention, we employ a bodyportion or casing 10, which is connected in any suitable manner with the handle 12 of usual construction. The heavy base portion is designated 14, and is provided with a chamber 15 in which is mounted a bar 16 of aluminum or other suitable metal, this bar being secured in position by a'screw 17 The opposite-end of the bar is connected by means of a screw 18 with a block 19, this element 19 serving to mount an adjustable contact member or screw 20, insulated from element 19.

Within the casing 10 is a body portion 23 of metal constituting a heating unit, and below the latter is the resistance element 25 mounted between strips 26 and 27'of mica, or the like. A heavy insulating strip 28 is mounted on the inner Wall of the rear end of the casing, and another similar strip 30 mounted opposite the strip 28 on the outside of the casinga threaded pin or screw 31 passing through the casing and through members 28 and 30 and carrying nuts 32 and on the opposite ends thereof.

In electrical connection with the outer end of pin 31 is a conducting plate 35 adapted to Patented July .11, 192 2.

have contact with the complementary con- I tact member 20, and to be spaced from said contact member 20' upon the expansion of the bar 16, when the iron has been heated to the required degree. The breaking of the contact of course breaks the circuit for the heating element or resistance. v

A conducting strip 38 extends from one end of the heating element to the pin 31 and is in electrical connection therewith, and the other end of this heating element 25 is. in electrical connection with conducting strip 39 leading to a terminal member 40 connected with a socket 41 in the usual manner. The pin 31 is in electrical connection by material.

As stated, the application of our device is here shown as applied to an ordinary electric fiat iron, but it may be used in any other electric heating apparatus by inserting the aluminum expansion bar into the part ofthe electric apparatus which is heated, the controlling device being the same as set forth.

We ar aware that the expansion and contraction of aluminum or other metal has been previously used in electric thermostat devices. We therefore do not claim gex' elusive discovery of that principle, but

We claim. The combination with a body to be maintained at a substantially uniform temperatui'e, of an expansion bar mounted therein,

7 5 means of a strip 42 with terminal 43 also i connected with the socket, and with conan adjustable contact element carried by the breaking the circuit upon further expanbar, and a resilient contact element with si0n.- reference to which the adjustable contact e]e-' ment is movable upon the expansion and 5' contraction of the bar, the contacts main- Witnesses.

mining the circuit during the expansion and W. C. THOMAS, contraction of the bar to a given degree and B. B. BIXBY ALBERT FRANKLIN BROWN. LAWRENCE BURROUGHS BURCK.

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