US1233395A - Electric hot-plate or heat unit. - Google Patents

Description

1. c. PATTEN. ELECTRIC HOT PLATE OR HEAT UNIT. APPLICATION FILED AUG. 30. I9I5. 1,233,395, Patented July 17, 1917.

2 SHEETS-SHEET I.

1.*C. PATTEN.

- ELECTRIC HOT PLATE OR HEAT UNIT.

APPLICATION FILED AUG. 30, 1915. 1,233,395. l Patented Ju1y1I,1917.l

2 SHEETS-SHEET 2.

A TTOR/VEYS following specification.

STATES PATENT 4omnes.

` IL HES C. PATTN, F KKOIO, INDIANA, ASSIGNOB T0 .THE-GLGBE STO'V'E & :RANGE coikrm, or xoxoxo, INDIANA. Y

`:minerais nominare on mr UNIT.

Application led August 80, 1915. Serial'loAS'?.

To all 'whom 'it may concern;

Be it known that I, JAMES C. PATTEN, a citizen of the United States, residing at Kokomo Indiana, have invented certain new and useful Im rovements in Electric Hot- Plates or Heat Il'nits, of which the following is a specification.

This invention relates to improvements in electric hot plates or heat units.

The objects of the invention are:

First, to increase the capacity of such a unit in delivering the radiant heat therefrom.

Second, to increase the durability o f the coils of wire, particularly at the terminals.

Third, to secure effective connections and avoid arcing.

. details and economies of construction and operation will definitel appear from the detailed description to ollow.

- I accomplish the objects of my invention by the .devices and means described in the The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is fully illustrated in the accompanying drawing, forming a part of this specication, in which:

Figure I is a plan view of a hot plate embodyinglthe features of my invention.

Fi groovged porcelain plate holding the heating coils.

Fig. III is a detail sectional view on line 3-3 of Fig. I, showing my improved heater supported on the base.

Fig. IV is a detail sectional view on line 4-4 of Fig. I, showing the details of the terminal pins and their connections.

Fig. V is an enlarged detail plan view of terminals of the structureappearing in Fig. I, showing the details of the coilng and arrangement of the wires at the terminals.

Fig. VI is an enlarged detail sectional view on line 6 6 of Fig. V, showing the flattening of the wires at the terminals and the method of securin the same.

Fig. VII is an e arged detail sectional l View showing .the method of securing the coil in another form of heat unit in which my invention may be made use of.

In the drawings the sectional views are taken looking in the direction of the little arrows at the ends of the section lines and I is a plan view ofthe detachedV BpeaMloat-ion of Letters Patent. l Patented J Illy 17, 1917..

' an insulating material 2, such as fiber or asbestos. `An insulator plate 3 of porcelain is provided for supporting the heating coilsand a'metal plate 4 to shield and protect the same 1s provided and held in place by screws 5 through said plates and through slotted Aopenings 6 in the said porcelain plate. Coils 7 are disposed in the bottoms of the grooves 7 in said porcelain plate. The coils are flattened so that each turn ofthe coil is'substantially an ellipse and each coil is connected to a terminal pin 8, all of these parts being similar in design to that appearing in the concurrent patent application of Maurice E. Louth and Jess Jackson.

I connect the coils to the terminal pins by, forming a loop 12 in the ends thereof, which is clamped between the bindingl nuts 9 and 10 (see Fig. VI). A Washer 11 is disposed between these to improve the contact, and the loop l2 of the coil preferably has the wire iiattened to make a broad contact at this point. The end 13 of the wire is Wound in a loose coil around the main part of the wire 7 and the coils of wire at this place are opened out as seen at 14. in Figs. V and VII. The object of this is that the conductivity of the 'wire is increased by doubling the same and by wrapping the Wire therearound, and the temperature of the part at this point is reduced by the lessened resistance and the greater mass of metal and by opening out the coil, so that there is no abrupt shoulder where the high temperature begins and consequently no particular spot where the coil or wire is injuriously affected by such high temperature. I find that by this arrangement the terminals last substantially as long as the coils themselves, whereas without tliese means the terminals very quickly burn o I also avoid arcing by using an alloy forl the binding post parts with a very low coefficient of expansion, finding that an alloy can be made use'of that has about the same expansion as platinum, and by making use of the same and with the broad surface of the fiattened wire a perfect contact is secured so that there is no Aarcing at these points. The particular metal used is known

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