Arrangement for heating an automobile glazing unit
First Claim
Patent Images
1. An arrangement comprisinga glazing unit having a lower sectionan electrically resistant grid pattern in thermal contact with an area of the lower section of the glazing unit, the grid pattern having a plurality of horizontally spaced resistance heating conductors;
- bus bars disposed along and electrically connecting opposite edges of each of the heating conductors with the bus bars being connected to a power source to provide current flow through the bus bars and the heating conductors; and
a set of vertically spaced shorting bars electrically intersecting at least two of the heating conductors at respective points having equal voltage potentials and having an absence of current flow through the vertically spaced shorting bars upon the power source providing current flow through the bus bars and the heating conductors, each vertically spaced shorting bar having an insignificant resistivity as compared to the heating conductors such that insignificant heat is generated upon current flow through each shorting bar as compared to heat generated by each heating conductor.
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Abstract
A novel arrangement for electrically heating the lower section of an automobile glazing unit is disclosed. An embodiment of the arrangement includes a heating grid pattern employing vertical shorting bars to prevent complete inoperability of individual heating conductors. An alternate embodiment of the arrangement includes heating conductors of varying electrical resistance to achieve greater heat generation at desired locations.
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Citations
10 Claims
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1. An arrangement comprising
a glazing unit having a lower section an electrically resistant grid pattern in thermal contact with an area of the lower section of the glazing unit, the grid pattern having a plurality of horizontally spaced resistance heating conductors; -
bus bars disposed along and electrically connecting opposite edges of each of the heating conductors with the bus bars being connected to a power source to provide current flow through the bus bars and the heating conductors; and a set of vertically spaced shorting bars electrically intersecting at least two of the heating conductors at respective points having equal voltage potentials and having an absence of current flow through the vertically spaced shorting bars upon the power source providing current flow through the bus bars and the heating conductors, each vertically spaced shorting bar having an insignificant resistivity as compared to the heating conductors such that insignificant heat is generated upon current flow through each shorting bar as compared to heat generated by each heating conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An arrangement for electrically heating a lower section of an automobile glazing unit comprising
an electrically resistant grid pattern in thermal contact with an area of the lower section of the automobile glazing unit, the grid pattern having a plurality of horizontally spaced resistance heating conductors being about 0.01 inches to about 0.060 inches in width; -
bus bars disposed along and electrically connecting opposite edges of each of the heating conducts with the bus bars being connected to a power source to provide current flow through the bus bars and the heating conductors; and a set of vertically spaced shorting bars being about 0.030 inches to about 0.060 inches in width electrically intersecting at least two of the heating conductors at respective points having equal voltage potentials and having an absence of current flow through the vertically spaced shorting bars upon the power source providing current flow through the bus bars and the heating conductors, each vertically spaced shorting bar having an insignificant resistivity as compared to the heating conductors such that insignificant heat is generated upon current flow through each shorting bar as compared to heat generated by each heating conductor, grid pattern comprising electrically conductive enamel or ceramic materials having resistive portions of varying degree with the grid pattern being adjacent to an interior surface of the automobile glazing unit.
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Specification