US1758704A - Circuit wiring for windshields and the like - Google Patents

Description

May 13, 1930. J. A. 'JOHNSON 1,758,704

` CIRCUIT WIRING FOR WINDSHIELDS AND THE.' LIKE Filed Aug. 5J 1929 Z3 INVENTOR J CK AJ'oH/vso/V 7 9 BY ATTORNEY Patented May 13, 1930 UNI-TEDI STATES JACK A.. JOHNSON, 0F ROBBINSDALE, MINNESOTA PATENT OFFICE Application led August 5, 1929. Serial No. 383,498.

This invention relates to means for heating glass panes, such as used for vehicle windshields, windows, and the like, to prevent the accumulation thereon of ice, frost and condensation, and the primary object is to provide an improved means and method for wiring such glass whereby the glass w1ll be heated, by high resistance wires imbedded therein when suitably connected in controlled circuit with a source of electricity. The in vention herein disclosed is particularly an .improvement over the structure illustrated in my cospending application, Ser. No. 336,- 215, filed January 30, 1929, for windshield.

In the accompanying drawing, forming a part of this speciiication:

Fig. 1 is a plan elevation showing asheet of glass, in which my wiring system has been imbedded, the dotted cross lines indicating the method of cutting the glass into sections for use as Windshields or windows.

Fig. 2 is an enlarged detail perspective view of one corner of a window or windshield embodying the invention.

Fig. 3 is a sectional detail view on the line 3-3 in Fig. 2. v

Referring to thefdrawing more particularly and by reference characters, 4f designates a sheet of glass, which may of course be of any size, and may be measured .into as many sections as may be desired, depending upon the size and number of finished sections to be cut. In the present instance` it is assumed 3f that the glass is of such a size as to form four sections, A, B, C, and D, which are to be separated by cutting on the` crossed lines 5 and 6, and after being cut will be y of a proper size for use as windshields or windows.

When making the glass sheet or 'plate 4 a number of spaced parallel wires 7 are imbedded in it and extend throughout the horizontal length of the glass. Before the wires are so placed or imbedded in the glass they are provided at their ends with lugs or terminals 8, and midway between their ends the wires are provided with similar lugs 9, which yare longer than 8, however, so that when the glass is cut on the line 5. the lugs at the ends of each section or panel A-D will be of equal length.

The wiresl 7 are' high-.resistance.wires,', which, when energized, will developconsider-` able heat, to raise the temperature of the glass and thus prevent the accumulation of frost or other condensation, and as these wires are imbedded in the body of the glass proper they will of course be protected from atmospheric contact.

The lugs 8 and 9 are preferably of harder metal than the heating wires for which theyl serve as terminals, and can best `be secured thereto by being formed with axial holes to receive vthe wires, after which they may .5 be spot welded or pinched, at their ends, upon the wires, to hold them in place before being set in the glass. The exposed ends of the lugs are. then drilled and tapped to receive binding screws 10, as shown in Figs. 2 7 and 3, which in turn secure the electric circuit wires 11, that are to furnish the heat. ing current. Such current or circuit wires may be otherwise arranged and controlled in any suitable manner, although the plan described in my above noted application is desirable.'

The terminal members 9 and 10, as well as the circuit wires 11, are preferably 'protected by a semi-tubular insulation 12, and 13 desigo nates the frame of the windshield or window.

The novelty of the invention will no doubt be obvious from the foregoing description. It may be stated, however, that the greatest diiliculty encountered in setting up an arrangement wherein the inset wires have no lugs such as 8 and 9, is that when the glass is cut the wire is cut off Hush with it, and therefore cannot be secured to an appropriate terminal, for connection with the circuit wires. This difficulty is entirely overcome in the present inst-ance, and there is also the added advantage that the heating element wires are not exposed to atmospheric contact, even at their ends.

It is understood that suitable modifications may be made in the structure as disclosed, provided such modifications come within the spirit and scope of the appended claims. Having now therefore fully illustrated and 10 described my invention what ll claim to loe new end desire to protect by Letters Patent is:

2l. A windshield or the like comprising a, glass piste, lugs imbedded in opposite edges of the glass, high resistance wires extending through the glass to eireuitously connect certain of the lugs, and binding screws threaded in the lugs to form terminals therewith Jfor I 'the wires 2. The method of circuit wiring a glass plate comprising the securing of terminal lugs to the wires of the circuit, and then imbedding the wires and lugs in the glass, while in a molten state.

3. The method of circuit wiring at glass yplate comprising the securing of terminal lugs to the wires of the circuit, and then imbedding the wires and lugs in the glass, While in a molten state, leaving the lugs exposed at one ,edge of the glass.

4. The method of circuit wiring a glass plate comprising the securing of terminal lugs to the Wires of the circuit, and then im- `bedding therwires and lugs in the glass, while in a. molten state, leaving the lugs exposed at one edge of the glass, and thereupon drilling and tapping the lugs for the engagement of binding screws.

Signed at' Minneapolis, in the county of Hennepin, and State of Minnesota, this 3rd day of August, 1929.

JACK A. JOHNSON.

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