CA1186718A - Heater assembly for heating glass surface - Google Patents
Heater assembly for heating glass surfaceInfo
- Publication number
- CA1186718A CA1186718A CA000417916A CA417916A CA1186718A CA 1186718 A CA1186718 A CA 1186718A CA 000417916 A CA000417916 A CA 000417916A CA 417916 A CA417916 A CA 417916A CA 1186718 A CA1186718 A CA 1186718A
- Authority
- CA
- Canada
- Prior art keywords
- busbars
- heater elements
- heater
- accordance
- electrically conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Surface Heating Bodies (AREA)
Abstract
ABSTRACT
A heater assembly for heating a surface such as the rear window of an automobile. A plurality of heater elements are adhesively secured onto the surface in generally vertically spaced horizontally extending direction. A pair of busbars are adhesively secured onto said surface in generally verti-cally extending direction overlying the heater elements adjacent the opposite ends thereof. End portions of the heater elements which extend beyond the busbars are wrapped around the busbars and firmly retained by a pair of covering members which are secured in juxtaposed relation to the busbars for providing good electrical contact between the heater elements and the busbars.
A heater assembly for heating a surface such as the rear window of an automobile. A plurality of heater elements are adhesively secured onto the surface in generally vertically spaced horizontally extending direction. A pair of busbars are adhesively secured onto said surface in generally verti-cally extending direction overlying the heater elements adjacent the opposite ends thereof. End portions of the heater elements which extend beyond the busbars are wrapped around the busbars and firmly retained by a pair of covering members which are secured in juxtaposed relation to the busbars for providing good electrical contact between the heater elements and the busbars.
Description
7~
The present invention relates to a heater assembly adap-ted to be secured to a glass surface, and particularly a glass surface defined by a rear winclow of an automobile so that the heater assembly functions as a clefroster and/or defogger to permi-t unmarred vision therethrough.
Rear window defrosters can be supplied as original equlpment in an automobile in which case the heatiny elements are usually embedded directly within the window glass. The heater assembly involved herein, however, is of the type which is not provided as ori.ginal equipment with the automobile but which is applied to the rear window of an automobile not equipped with an embedded heater assembly.
U. S. Patent No. 3,757,087 illustrates a heater assem-bly consisting of a heating array supported by a backing sheet which enables the array to be secured onto the window, after which the backing sheet is peeled off, leaving only heater ele-ments on the rear window of the automobile. By passing elec-trical current through the array, there is generated heat whlch, in turn, causes the defrosting and defogging of the rear window to which the array is secured.
In order to more closely simulate a rear window defros-ter of the type which is embedded within the glass window as part of the original equipment, it has become desirable to define the heating array by a plurality of parallel spaced horizon-tally e~-tending na.rrow heater elements whose opposite ends are electrically connected to a pair of electrical conductive bus-bars to define a complete electrical circuit for the heater elements. Placin~ a suitable voltage across the opposite bus-bars will cause electrical current to flow through the heater elements to provide the necessary heat so that the defroster ,~
--1-- ~
and defogging function can be performed. An example of such arran~ement is shown in U. S. Patent No. 4,213,028.
In the type of construction described in Patent No.
4,213,028, it is of great importance to secure the opposite ends of the heater elements to the busbars in a way which will be simple, which will insure good electrical contact between the heater elements and the busbars, which will rnaintain good physical securement of the heater elements to -the busbars and good securement of the busbars to the rear window. This is attempted in Patent NoO 4,213,028 by first placing the two bus-bars in position on the wi.ndow and thereafter laying the several electrical heating elements across the window with the ends thereof overlapping the busbars. While such arrangement has been satisfactory to some degree, it does require that the ins-taller commit himself to the overall width of -the heating array when first placing the busbars in position, before the heater e:Lements are themselves placed on the window. Further, in such arrangement, there is a relatively small portion of the heater element in engagement with the busbar, such portion necessarily bein~ limited to the width of the busbar. Accord-ingly, both the physical and electrical connections between the heater elements and the busbar are limited in degree.
It is therefore an object of the presen-t invention to provide an improved heater assembly which will enable more secure electrical and physical connections between the ends of the heater elements and the associated busbars.
In accordance with the invention, the heater elements are first secured onto the rear window, in predetermined para-llel spaced relationship and e~tending for substantially the entire width of the window. Thereafter, with the heater ele-ments already in place, the busbars, each comprising an elec-trical conduc-tive element backed with an adhesive layer, are placed onto the window, at the desired location~ in overlapping relation with -the ends of the heater elements~ with the adhes-ive backing of the busbars in firm engagement with the heater elements where they overlie the same, and with said adhesive backing in direct engagement with the glass surface between adjacen-t heater elements. Thereafter, the hea-ter element end portions which extend beyond the busbars are turned back on themselves and wrapped around the busbars with -the conductive part of the heater element in direct engagement with the conduc-tive part of the busbar.
Finally, a cover strip or channel made of an insu-lating material and backed with an adhesive layer is superim-posed onto the busbar to which it is adhesively secured, with -the wrapped around end portion of the heater elements firmly held cap-tive between the busbar and the covering strip in solid physical and electrical relation with the busbar. This arrange-ment provides a far superior physical and eleckrical connection between the heater elements and busbar than heretofore obtained, and such arrangement is accomplished in a most simplified manner.
The invention will now be described by way of example with reEerence to the accompanying drawings in which:
Fig. 1 is a front elevational view of a heater assem-bly installed on a window of an automobile;
Fig. 2 is a sectional view, on an enlarged scale, taken along line 2-2 of Fig. l;
Fig. 3 is a sec-tional view, on an enlarged scale, taken along line 3-3 of Fig. l;
Fig. ~ is a view similar to Fig. 3, illustrating another embodiment o~ the invention;
F'ig. 5 is a sectional view through ~ hea-ter element in accordance with another embodiment of the lnvention;
Fig. 6 is a view similar to Fig. 5, showing yet another embodiment of a heater element;
Fig. 7 is a schematic view of the electrical cir-cuitry of the embodiment of Fig. l; and Fig. 8 is a schematic view of the electrical cir-cuitry in accordance with another embodiment of the invention.
Referring now to the drawings, and particularly to Figs. 1, 2 and 3~ there is shown a glass surface 10, typically a rear window of an automobile, provided with a heater assem-hl.y 12 in accordance with the invention. The heater assembly l.2 consists primarily of a plurality of parallel spaced heater elements 14 adhesively secured to glass surface 10, in parallel spaced relationship, whose opposite ree ends are secured to a pair of vertically extending busbar assemblies 16, with which they are in electrically conductive relation. The busbars are provided with a pair of terminals 18 which are adapted to be connec:ted to a power source, via a switch, so that when the switch is on, the elements 14 will be appropriately heated in order to defog and defrost the glass surface to which the heater elements 14 are secured. Where the glass surface is the rear window of an automobile, the heater elements will perform the function of a rear window defroster, permitting vlsion through the rear window which would otherwise be marred.
Each heating element 14 comprises an electrically conductive narrow strip 20 backed with an adhesive coating 22 which serves to secure the heating element 1~ to the glass surface 1Ø ~leating elements 14 can be applied to the window in any one of a plurality of ways and the particular manner of application does not form part of -the subject invention. More specifically, the heating elements 1~ can be applied to the window, one at a time, as each is unwound from a single roll.
Alterna-tely, two or more heating elements may be supported in predetermined spatial relationship by a backing sheet which is then applied to the glass surface enabling the heater elements to adhere to said surface r after which the backing layer may be peeled off leaving only the heater elements on the glass sur-face. Such heater elements carrying backing sheet may either be provided with a protective sheet or may be wound into a roll, for storage purposes. Whichever method is utilized, it results in securing onto the glass surface a plurality of heater ele-ments with the adhesive layer 22 against the glass surface and with the electrically conductive strip 20 being exposed.
The invention addresses itself primarily to the manner in which -the opposite ends of the heater elements are function ally related to busbar assemblies 16 to define means for pro-viding electric power -to the heating elements to enable them to perform the previously described heating function, as will now be described.
The several heating elements 14 are ini-tially secured onto the glass surface in parallel spaced relationship so as to extend over substantially the entire width of the surface 10.
The parallel spaced relation may be obtalned by use of a marking device or template where the heating elements are put in place one at a time, or may be automatically obtained where such spaced relationship is initially defined by the backing layer which is ultimately peeled off.
Thereafter, a pair of busbars 2g, each comprising an 6b7:~
electrically conductive element 26 provided with an adhesive layer 28, are placed onto the glass surfacet extending in an upward direction, overlying the outer ends of heating elements 14~ with adhesive layer 28 on busbar 2~ being in engagement with the exposed conductive portion 20 of the heating element, where it overlies the element, and with adhesive surface 28 being directly in engagement with the glass sur:Eace inbetween adjacent heating elements to securely adhere busbar 24 onto said glass surface. It will be understood that the location 1.0 of busbars 24 will define the overall wid-th of the heater assem-bly 10.
When initially placing the heater elements 14 onto the glass surface the length of each element is selected so that, when placed on the glass surface, the ends thereof extend sligh-tly beyond the expected location of busbars 24, as shown by the dotted lines in Figure 2. Following the placement of upwardly extending busbars 24 on the glass surface the portion oE heater element 14 which extends beyond busbar 24 is turned back on itself and wrapped about the busbar, as shown by the full lines in Figure 2 whereby the conductive portion 20 comes into surface to surface engagement with electrically conductive portion 26 of busbar 24, at the same time leaving adhesive coat-ing 22 exposed.
Fi.nally, after the opposite ends of each heater ele-ment have been wrapped about their associated busbars 26, there is provided for each busbar a longitudinally covering strip 30 made of plastic or other insulating material, substantially coextensive with busbar 26, and provided on its undersurface with an adhesive layer 32 for retaining the wrapped around por-tion of heater element 14 in place, whereby good electrical contact is obtained and maintained between electrically conduc-tive portion 20 of the heater element and electrically conduc-tive busbar portion 26. It will also be noted -that adhesive layer 32 of covering strip 30 is in surface to surface contact with busbar 24 throughout its entire extent, except only where such surface is in contact with adhesive layer 22 of the heater elements. Thus, it is seen that busbar 24 is firmly secured by its adhesive layer 28 to the glass surface and tha-t covering strip 30 is, in turn, firmly secured to busbar 24 by means of its adhesive element 32.
It will thus be seen that in accordance with the above description, a simple way is provided for establishing a firm bonding of the heater elements to the busbars in a way which provides excellent and permanent electrical conductivity between the busbars and the heater elements. More specifically, by wrap-ping the ends of the heating elements about the busbars there is provided a more secure physical and electrical connection than previously availableO Furthermore, because of the wrap around Eeature, the heater elements may be placed on -the glass surface without being initially concerned about the busbars since these are not placed on the window until ater the heater elements are placed thereon.
Figure 4 illustrates a slightly modified version o~
-the invention. In accordance with this embodiment, the heater element 20 and busbars 24 are identical in form and are applied exactly in the same manner as discussed in connection with Figs.
1 to 3. Instead of the covering strip 30, however, there is provided a covering channel 30' which receives -the busbar 24 and the portion of the heatex element 20 wrapped about the bus~
bar so as to fu1ly encase these elements, thus providing a more finished appearance to the entire assembly/ more nearly simu-lating a rear window defroster of the type originally provided as original e~uipment on automobiles by the manufaturer. Cover-iny channel 30' is provided with an adhesive layer 32' which performs exactly the same function as the adhesive layer 32 in the embodiment of Figures 1 to 3. In accordance with this embod-imen-t, none of the adhesive layers :Eorming part of the assembly are exposed, all of these being fully contained within covering channel 30'. In all other respects, however, the embodiment of Figure 4 is identical to that of Figures 1 to 3.
Figure 5 illustrates another embodiment of the heater element used in accordance with the invention. More specifi-cally, in accordance with this embodiment, heater element 14' comprises electrically conductive portion 20', adhesive coating 22', and a Mylar intermediate layer 23 to impart to the heater element more body and thus facilitate its handling and increas-ing its strength.
Figure 6 is yet another embodiment of the heater ele~
ment 1.4'' in which there is provided electrically conductive portion 20'', adhesive coating 22'', Mylar intermediate layer 23'', and foam layer 25. This embodiment imparts to the heating element even greater body and ease of handling than the embodi-ment of Figure 5.
Both oE the embodiments of Figures 5 and 6 are util-ized precisely in the same manner as the heater element illus-trated and described in connection ~ith Figures 1 to 3.
In the embodiment of Figure 1, all the heater elements 1~ are in electrical parallel relationship with respect to the busbar assembly 16, such being shown schematically in Figure 7.
It will be underscood, however, that instead of havin~ two con-~k ~ rk tinuous busbars interconnected to the opposite ends of the heater elemen-ts, as in Figure 7, one of the busbars could be interrupted as shown in Figure 8 in which event electrical -terminals for the heating array is provided at -the points where the busbar is interrupted, identified by the reference numeral 18'~-18'~, providing in this manner a paral].el series arrange-ment for the respective heater elements. In all other respects, however~ -the manner in which the heater elements are wrapped around and electrically connected to the busbar is identical to tha-t described in connection with the embodimen-ts of Figures 1 -to 3.
The present invention relates to a heater assembly adap-ted to be secured to a glass surface, and particularly a glass surface defined by a rear winclow of an automobile so that the heater assembly functions as a clefroster and/or defogger to permi-t unmarred vision therethrough.
Rear window defrosters can be supplied as original equlpment in an automobile in which case the heatiny elements are usually embedded directly within the window glass. The heater assembly involved herein, however, is of the type which is not provided as ori.ginal equipment with the automobile but which is applied to the rear window of an automobile not equipped with an embedded heater assembly.
U. S. Patent No. 3,757,087 illustrates a heater assem-bly consisting of a heating array supported by a backing sheet which enables the array to be secured onto the window, after which the backing sheet is peeled off, leaving only heater ele-ments on the rear window of the automobile. By passing elec-trical current through the array, there is generated heat whlch, in turn, causes the defrosting and defogging of the rear window to which the array is secured.
In order to more closely simulate a rear window defros-ter of the type which is embedded within the glass window as part of the original equipment, it has become desirable to define the heating array by a plurality of parallel spaced horizon-tally e~-tending na.rrow heater elements whose opposite ends are electrically connected to a pair of electrical conductive bus-bars to define a complete electrical circuit for the heater elements. Placin~ a suitable voltage across the opposite bus-bars will cause electrical current to flow through the heater elements to provide the necessary heat so that the defroster ,~
--1-- ~
and defogging function can be performed. An example of such arran~ement is shown in U. S. Patent No. 4,213,028.
In the type of construction described in Patent No.
4,213,028, it is of great importance to secure the opposite ends of the heater elements to the busbars in a way which will be simple, which will insure good electrical contact between the heater elements and the busbars, which will rnaintain good physical securement of the heater elements to -the busbars and good securement of the busbars to the rear window. This is attempted in Patent NoO 4,213,028 by first placing the two bus-bars in position on the wi.ndow and thereafter laying the several electrical heating elements across the window with the ends thereof overlapping the busbars. While such arrangement has been satisfactory to some degree, it does require that the ins-taller commit himself to the overall width of -the heating array when first placing the busbars in position, before the heater e:Lements are themselves placed on the window. Further, in such arrangement, there is a relatively small portion of the heater element in engagement with the busbar, such portion necessarily bein~ limited to the width of the busbar. Accord-ingly, both the physical and electrical connections between the heater elements and the busbar are limited in degree.
It is therefore an object of the presen-t invention to provide an improved heater assembly which will enable more secure electrical and physical connections between the ends of the heater elements and the associated busbars.
In accordance with the invention, the heater elements are first secured onto the rear window, in predetermined para-llel spaced relationship and e~tending for substantially the entire width of the window. Thereafter, with the heater ele-ments already in place, the busbars, each comprising an elec-trical conduc-tive element backed with an adhesive layer, are placed onto the window, at the desired location~ in overlapping relation with -the ends of the heater elements~ with the adhes-ive backing of the busbars in firm engagement with the heater elements where they overlie the same, and with said adhesive backing in direct engagement with the glass surface between adjacen-t heater elements. Thereafter, the hea-ter element end portions which extend beyond the busbars are turned back on themselves and wrapped around the busbars with -the conductive part of the heater element in direct engagement with the conduc-tive part of the busbar.
Finally, a cover strip or channel made of an insu-lating material and backed with an adhesive layer is superim-posed onto the busbar to which it is adhesively secured, with -the wrapped around end portion of the heater elements firmly held cap-tive between the busbar and the covering strip in solid physical and electrical relation with the busbar. This arrange-ment provides a far superior physical and eleckrical connection between the heater elements and busbar than heretofore obtained, and such arrangement is accomplished in a most simplified manner.
The invention will now be described by way of example with reEerence to the accompanying drawings in which:
Fig. 1 is a front elevational view of a heater assem-bly installed on a window of an automobile;
Fig. 2 is a sectional view, on an enlarged scale, taken along line 2-2 of Fig. l;
Fig. 3 is a sec-tional view, on an enlarged scale, taken along line 3-3 of Fig. l;
Fig. ~ is a view similar to Fig. 3, illustrating another embodiment o~ the invention;
F'ig. 5 is a sectional view through ~ hea-ter element in accordance with another embodiment of the lnvention;
Fig. 6 is a view similar to Fig. 5, showing yet another embodiment of a heater element;
Fig. 7 is a schematic view of the electrical cir-cuitry of the embodiment of Fig. l; and Fig. 8 is a schematic view of the electrical cir-cuitry in accordance with another embodiment of the invention.
Referring now to the drawings, and particularly to Figs. 1, 2 and 3~ there is shown a glass surface 10, typically a rear window of an automobile, provided with a heater assem-hl.y 12 in accordance with the invention. The heater assembly l.2 consists primarily of a plurality of parallel spaced heater elements 14 adhesively secured to glass surface 10, in parallel spaced relationship, whose opposite ree ends are secured to a pair of vertically extending busbar assemblies 16, with which they are in electrically conductive relation. The busbars are provided with a pair of terminals 18 which are adapted to be connec:ted to a power source, via a switch, so that when the switch is on, the elements 14 will be appropriately heated in order to defog and defrost the glass surface to which the heater elements 14 are secured. Where the glass surface is the rear window of an automobile, the heater elements will perform the function of a rear window defroster, permitting vlsion through the rear window which would otherwise be marred.
Each heating element 14 comprises an electrically conductive narrow strip 20 backed with an adhesive coating 22 which serves to secure the heating element 1~ to the glass surface 1Ø ~leating elements 14 can be applied to the window in any one of a plurality of ways and the particular manner of application does not form part of -the subject invention. More specifically, the heating elements 1~ can be applied to the window, one at a time, as each is unwound from a single roll.
Alterna-tely, two or more heating elements may be supported in predetermined spatial relationship by a backing sheet which is then applied to the glass surface enabling the heater elements to adhere to said surface r after which the backing layer may be peeled off leaving only the heater elements on the glass sur-face. Such heater elements carrying backing sheet may either be provided with a protective sheet or may be wound into a roll, for storage purposes. Whichever method is utilized, it results in securing onto the glass surface a plurality of heater ele-ments with the adhesive layer 22 against the glass surface and with the electrically conductive strip 20 being exposed.
The invention addresses itself primarily to the manner in which -the opposite ends of the heater elements are function ally related to busbar assemblies 16 to define means for pro-viding electric power -to the heating elements to enable them to perform the previously described heating function, as will now be described.
The several heating elements 14 are ini-tially secured onto the glass surface in parallel spaced relationship so as to extend over substantially the entire width of the surface 10.
The parallel spaced relation may be obtalned by use of a marking device or template where the heating elements are put in place one at a time, or may be automatically obtained where such spaced relationship is initially defined by the backing layer which is ultimately peeled off.
Thereafter, a pair of busbars 2g, each comprising an 6b7:~
electrically conductive element 26 provided with an adhesive layer 28, are placed onto the glass surfacet extending in an upward direction, overlying the outer ends of heating elements 14~ with adhesive layer 28 on busbar 2~ being in engagement with the exposed conductive portion 20 of the heating element, where it overlies the element, and with adhesive surface 28 being directly in engagement with the glass sur:Eace inbetween adjacent heating elements to securely adhere busbar 24 onto said glass surface. It will be understood that the location 1.0 of busbars 24 will define the overall wid-th of the heater assem-bly 10.
When initially placing the heater elements 14 onto the glass surface the length of each element is selected so that, when placed on the glass surface, the ends thereof extend sligh-tly beyond the expected location of busbars 24, as shown by the dotted lines in Figure 2. Following the placement of upwardly extending busbars 24 on the glass surface the portion oE heater element 14 which extends beyond busbar 24 is turned back on itself and wrapped about the busbar, as shown by the full lines in Figure 2 whereby the conductive portion 20 comes into surface to surface engagement with electrically conductive portion 26 of busbar 24, at the same time leaving adhesive coat-ing 22 exposed.
Fi.nally, after the opposite ends of each heater ele-ment have been wrapped about their associated busbars 26, there is provided for each busbar a longitudinally covering strip 30 made of plastic or other insulating material, substantially coextensive with busbar 26, and provided on its undersurface with an adhesive layer 32 for retaining the wrapped around por-tion of heater element 14 in place, whereby good electrical contact is obtained and maintained between electrically conduc-tive portion 20 of the heater element and electrically conduc-tive busbar portion 26. It will also be noted -that adhesive layer 32 of covering strip 30 is in surface to surface contact with busbar 24 throughout its entire extent, except only where such surface is in contact with adhesive layer 22 of the heater elements. Thus, it is seen that busbar 24 is firmly secured by its adhesive layer 28 to the glass surface and tha-t covering strip 30 is, in turn, firmly secured to busbar 24 by means of its adhesive element 32.
It will thus be seen that in accordance with the above description, a simple way is provided for establishing a firm bonding of the heater elements to the busbars in a way which provides excellent and permanent electrical conductivity between the busbars and the heater elements. More specifically, by wrap-ping the ends of the heating elements about the busbars there is provided a more secure physical and electrical connection than previously availableO Furthermore, because of the wrap around Eeature, the heater elements may be placed on -the glass surface without being initially concerned about the busbars since these are not placed on the window until ater the heater elements are placed thereon.
Figure 4 illustrates a slightly modified version o~
-the invention. In accordance with this embodiment, the heater element 20 and busbars 24 are identical in form and are applied exactly in the same manner as discussed in connection with Figs.
1 to 3. Instead of the covering strip 30, however, there is provided a covering channel 30' which receives -the busbar 24 and the portion of the heatex element 20 wrapped about the bus~
bar so as to fu1ly encase these elements, thus providing a more finished appearance to the entire assembly/ more nearly simu-lating a rear window defroster of the type originally provided as original e~uipment on automobiles by the manufaturer. Cover-iny channel 30' is provided with an adhesive layer 32' which performs exactly the same function as the adhesive layer 32 in the embodiment of Figures 1 to 3. In accordance with this embod-imen-t, none of the adhesive layers :Eorming part of the assembly are exposed, all of these being fully contained within covering channel 30'. In all other respects, however, the embodiment of Figure 4 is identical to that of Figures 1 to 3.
Figure 5 illustrates another embodiment of the heater element used in accordance with the invention. More specifi-cally, in accordance with this embodiment, heater element 14' comprises electrically conductive portion 20', adhesive coating 22', and a Mylar intermediate layer 23 to impart to the heater element more body and thus facilitate its handling and increas-ing its strength.
Figure 6 is yet another embodiment of the heater ele~
ment 1.4'' in which there is provided electrically conductive portion 20'', adhesive coating 22'', Mylar intermediate layer 23'', and foam layer 25. This embodiment imparts to the heating element even greater body and ease of handling than the embodi-ment of Figure 5.
Both oE the embodiments of Figures 5 and 6 are util-ized precisely in the same manner as the heater element illus-trated and described in connection ~ith Figures 1 to 3.
In the embodiment of Figure 1, all the heater elements 1~ are in electrical parallel relationship with respect to the busbar assembly 16, such being shown schematically in Figure 7.
It will be underscood, however, that instead of havin~ two con-~k ~ rk tinuous busbars interconnected to the opposite ends of the heater elemen-ts, as in Figure 7, one of the busbars could be interrupted as shown in Figure 8 in which event electrical -terminals for the heating array is provided at -the points where the busbar is interrupted, identified by the reference numeral 18'~-18'~, providing in this manner a paral].el series arrange-ment for the respective heater elements. In all other respects, however~ -the manner in which the heater elements are wrapped around and electrically connected to the busbar is identical to tha-t described in connection with the embodimen-ts of Figures 1 -to 3.
Claims (11)
1. A heater assembly adapted to be secured to a glass surface to be heated comprising, a plurality of heater ele-ments each defined by an electrically conductive narrow strip backed with an adhesive coating adapted to be secured by said adhesive coatings onto said surface in generally vertically spaced horizontally extending direction, a pair of busbars, each defined by an electrically conductive bar backed with an adhesive coating, adapted to be secured onto said surface in generally vertically extending direction, one of said busbars overlying said heater elements adjacent the ends of said heater elements at one side of said surface and the other of said busbars overlying said heater elements adjacent the ends of said heater elements at the opposite side of said surface, whereby the adhesive coating on each electrically conductive bar is in engagement with the heater elements and with the glass surface intermediate said heater elements, said busbars being positioned so that the end portions of said heater elements extend beyond said busbars, said end portions of said heater elements being adapted to be turned about themselves and wrapped around said busbars with the electrically conductive strip of said heater elements being in engagement with the electrically conductive bar about which said end portions are wrapped, and a pair of covering members, each provided with an adhesive coating, adapted to be juxtaposedly secured onto said busbars, respectively, for substantially the entire extent of said bus-bars, thereby retaining the wrapped around end portions of said heater elements between the busbars and the covering members.
2. A heater assembly in accordance with claim 1, wherein said covering members are made of an electrically insulating material.
3. A heater assembly in accordance with claim 1, wherein said covering members are channel shaped so as to fully contain said busbars therein.
4. A heater assembly in accordance with claims 1, 2 or 3 wherein means are provided for applying a voltage across said pair of busbars.
5. A heater assembly in accordance with claim 1, wherein one of said busbars is interrupted between adjacent heater elements and wherein means are provided for applying a voltage across the points of interruption of said busbar.
6. A heater assembly in accordance with claims 1, 2, 3 wherein said glass surface is the rear window of an automobile.
7. A method of applying a heater assembly to a glass surface to be heated comprising the steps of, securing a plu-rality of heater elements, each defined by an electrically conductive narrow strip backed by an adhesive coating, onto said surface in generally vertically spaced horizontally extend-ing direction, with the adhesive coating in contact with said surface, securing a pair of busbars, each defined by an elec-trically conductive bar backed with an adhesive coating, onto said surface in generally vertically extending direction with one of said busbars overlying said heater elements adjacent the ends thereof at one side of said surface and the other of said busbars overlying said heater elements adjacent the ends there-of at the opposite side of said surface, whereby the adhesive coating on each electrically conductive bar is in engagement with the heater elements and with the glass surface in inter-mediate said heater elements, and said busbars being positioned so that the end portions of said heater elements extend beyond said busbars, turning said end portions of said heater elements about themselves and wrapping them about said busbars with the electrically conductive strip of said heater element being in engagement with the electrically conductive bar about which said end portions are wrapped, and securing a pair of covering members, each provided with an adhesive coating, onto said bus-bars in juxtaposition therewith for substantially the entire extent of said busbars, thereby retaining said wrapped around end portions of said heater elements between the busbars and the covering members.
8. A method in accordance with claim 7, wherein said covering members are made of an electrically insulating mater-ial.
9. A method in accordance with claim 7, wherein said covering members are channel shaped so as to fully contain said busbars therein.
10. A method in accordance with claims 7, 8 or 9, wherein one of said busbars is interrupted between adjacent heater elements.
11. A heater assembly in accordance with claim 5 wherein said glass surface is the rear window of an automobile.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42184882A | 1982-09-23 | 1982-09-23 | |
| US421,848 | 1982-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1186718A true CA1186718A (en) | 1985-05-07 |
Family
ID=23672294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417916A Expired CA1186718A (en) | 1982-09-23 | 1982-12-16 | Heater assembly for heating glass surface |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1186718A (en) |
-
1982
- 1982-12-16 CA CA000417916A patent/CA1186718A/en not_active Expired
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