US1758703A - Windshield - Google Patents

Description

J. A. JOHNSON WINDSHIELD Filed Jan. 30, 1929 May 13, 19:10.

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INYENTOR JACK A JOHNSON /8 BY ATTORNEY Patented May 13, 1930 UNITED STATES PATENT OFFICE JACK A. JOHNSON, OF ROBBINSDALE, MINNESOTA WIND SHIELD This invention relates to Windshields for motor vehicles and the primary object is to provide means of a novel, efficient, and practical nature for preventing the accumulation of ice, frost, or condensation on the windshield to obstruct the drivers vision. More specifically the invention comprises an electric heating or hot wire system, in which high resistance circuit controlled Wires are imbcdded or inserted in the windshield proper, so that the glass thereof may be heated, at will, under which circumstances its surfaces will remain relatively clear regardless of weather conditions and diiierences in, temperature inside and outside of the car.

in the accompanying drawing, illustrating a preferred embodiment of my invention Fi 1 is perspective elevation of a windshield unit embodying my invention, fractional portions being broken away for purpose oi illustration.

Fig. 2 is an enlarged sectional detail view on the line 22 in 1.

Fig. is a diagrammatic illustration of the circuit control system employed.

Referring to the drawing more particularly and by reference characters A designates the glass of a windshield having a frame B. This frame may be of any suitable construction although. a frame that is channel shaped in cross section, as shown, is best adapted in the present instance.

Extending horizontally through the glass A is a series of vertically spaced high resistance wires 4, 5, 6, and 7, terminating at the side edges of the glass in insulating terminal plugs 8. The wires 4l-7 maybe merely secured between two sheets of glass, but I prefer to imbed them in the body of a single pane. In either event the plugs 8 are intended to serve the double purpose of con nections between the wires l7 and the main circuit wires, and also to fit tightly in place to exclude air from reaching the wires 4-7. It is also preferable to place a semi-tubular insulation guard 9 over the circuit wires run-- ning up into the end posts of the frame 13.

The left ends of the wires 4 and 6 connect directly with one pole of a source of current, as a battery 10, by circuit wires 11 and 12, resoectively, the other pole of the battery being grounded as at 13. The left ends oi the wires 5 and. 7 are connected by circuit wires 14. and 15, respectively to the terminal 16 oi a switch 17, grounded as at 18. The wires 45 and 67 are connected in pairs. at their right ends. by short wires 19 and 20, and these wires are in turn connected by wires 21 and 22, respectively, to a second terminal 23 of the switch 17 As shown in Fig. 3, the switch 17 is in an open position, This switch is of course placed in a convenient position in the car for operation by the driver.

lVhen the switch is closed to terminal 16 currents are caused to flow through the two circuits 1o, 11, 4, 19. 5, 14, 1e, 17, 1s, 13, and 10, 12, 6, 20, 7, 15. 16, 17, 18, 13, thus causing all the wires 417 to become heated, and this heat is in turn spread quite uniform-- ly throughout the class A. Should it be desired to confine the currents to fewer oi? the wires 47, and thus more restrict the heating areas, but permit the application oi a more ellective current flow, the operator closes the switch 17 to the terminal The two previously described circuits are now open while new circuits are respectively closed through elements 10, 11, 1, 19, 21, 23, 17, 18, 13, and 10, 12, 6, 20, 22, 23, 17, 18, 13, thus only heatingthe resistance wires 4 and. 6.

It is of course understood that the invention may be applied to windows, other than Windshields, if so desired. It is further understood that suitable modifications may be made in the mechanical and electrical design and arrangements, as herein set forth, without departing from the invention, as such, provided, however, that such modifications come within the spirit and scope of the appended claim.

Having now therefore illustrated and described my invention, what I claim to be new and desire to protect by Letters Patent is:

The combination with the pane of a Windshield or the like, of vertically spaced heating wires imbedded in and extending horizontally through the pane for heating the same, and terminal plugs, for the wires, ilnbedded in the end edges of the pane.

Signed at Minneapolis, Minnesota, this 28th day of January, 1929.

JACK A. JOHNSON.

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