CA1039461A - Wiper blade with embedded heating element - Google Patents
Wiper blade with embedded heating elementInfo
- Publication number
- CA1039461A CA1039461A CA240,669A CA240669A CA1039461A CA 1039461 A CA1039461 A CA 1039461A CA 240669 A CA240669 A CA 240669A CA 1039461 A CA1039461 A CA 1039461A
- Authority
- CA
- Canada
- Prior art keywords
- blade element
- tubular member
- blade
- elongated
- length
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A heated windshield wiper assembly having a heat resistant flexible blade element provided with an electrical heating arrangement disposed in a cavity of the blade element. The heating arrangement includes a resistance element encased in the blade element for heating water fed into the cavity and out holes in the blade element onto an associate windshield. The resistance element is advantageously a wire arranged in a folded non-conductive tubular member encased in the blade element. A non-conductive coil encircling the tubular member for holding same in a folded condition so that the tubular member will uniformly distribute heat transferred to the tubular member from the resistance wire.
A heated windshield wiper assembly having a heat resistant flexible blade element provided with an electrical heating arrangement disposed in a cavity of the blade element. The heating arrangement includes a resistance element encased in the blade element for heating water fed into the cavity and out holes in the blade element onto an associate windshield. The resistance element is advantageously a wire arranged in a folded non-conductive tubular member encased in the blade element. A non-conductive coil encircling the tubular member for holding same in a folded condition so that the tubular member will uniformly distribute heat transferred to the tubular member from the resistance wire.
Description
~L03946~L
This invention relates generally to an electrically heated windshield : wiper assembly, and particularly ~o such a wiper assembly having an internal cavity through which he~ted and unheated water may flow to an associated wind-shield. Advantageously, the wiper assembly according to the present invention embodies heat and water facilities for facilitating removal of ice and precipi-tation under freezing conditions from the windshield of a vehîcle, and also to ~he removal of highway grime in summer by means of heat and water used in appropriate combination.
An object of the present invention is to provide a heated type of wiper blade construction capable of dissipating a requisite quantity o heat and water onto an associated windshield being wiped by the blade in a more efficient manner than known wiper blades of this kind so as to reduce the drain of elec~rical energy ~o ~ lower and more practical value for vehicle installa-tions. It is another object of the present invention to provide a wiper blade construction wherein the heating facilities are mounted in a novel manner for uniform distribution of the heat.
It ls yet another object of the present invention to provide a heated wiper blade construction which is economical in cost and capable of being tailored to various installational requirements.
It is yet another ob~ect of the present inven~ion to provide a wiper blade assembly through which heat and/or water may be distributed onto a surface being wiped, so as to fac~litate the cleaning process of the windshield without was~ing the supply of vehicular water.
Thesa and o1:her obJects are achie~ed according to the present inven-; tion by providing 8 heated windshield wiper assembly having: a hest resistant flexible blade element provided with an internal cavity for receiving ~ater;
and an electrical heating assembly encased ln the blade element for unifonmly distributing heat throughout the blade element and heating water in the cavity.
The heating arrangement advantageously includes a resista~ce element coupled to 8 source of electrical energy.
The heating arrangement advantageously further includes a heat distributing element in the form of a flexible, tubular member encased in the blade element and constructed from a non-conductive material. The tubular ~L~3~6~L
member may be arr~nged extending in a folded condition along the length of the blade element for flexing therewith. The resistance element will include a resistan~e wire extending through the tubular member and arranged for generating heat in responsa to a ~low of electrical current through the resistance wire.
The heating arrangement still further advantageously includes a non-conductive coil arranged encircling the tubular member for holding same in the folded condition, whereby heat is uniformly distribu~ed throughout the blade element.
The blade element preferably has a head portion, and a conduo~ive, rigid blade holder is arranged retainingly embracing the head portion of the blade element for fa ilitating attachment of the blade element ~o a wiper arm.
According to a preferred construction of the present in~ention, the resistance wire has a length substantislly exceeding the length of elongation of the blade element, and the tubular member includes a plurality of parallel portions extending substantially the elongated length of the blade and spaced from one another transversely to the elongated blade length.
A plurality of holes are advantageously provided in the blade element these holes being arranged com~unicating with the cavity along cnextensive sides of the blade element. In this manner, water being fed into the cavity in the blade eleme~t will exit through the holes and onto a windshield~ and the ~ike, being treated.
Figure 1 is a perspective view showing a windshield wiper assembly according to the present invention.
Figure 2 is a fragmentary, sectional view taken generally along the line 2-2 of Figure 1.
Figure 3 is a sectional view taken generally along the line 3-3 of Figure 2.
Figure 4 is a fragmentary, perspective view showing a portion of the heating element according to the present invention.
Figure 5 i8 a fragmentary, perspective view similar to the left end of Figure 1, but drawn to a larger scale and having some parts removed.
Figure 6 is a fragmentary, bottom plan view of the wiper blade element according to the present invention.
~39~6~
Referring now more par~icularly to Figures 1 thr~ugh 3 of the draw-ings, a heated windshield wiper assembly 10 according to the presen~ invention has a heat resistant flexible blade element 12 provided with an internal cavity 14 arranged for receiving water and similar fluids. An electrical heating arrangement 16 is encased in element 12 for uniformly distributing heat through-out elemént 12 and heating water (not shown) in cavity 14. As illustrated, heating arrangement 16 is advantageously arranged in cavity 14, and arrangement 16 lncludes a resistance wire 18 connectible to the, for e~ample, electrical system (not shown~ of the vehicle (nok shown) on which assembly 10 is used a~
by a coupling arrangement 20 arranged for establishing a grounded electrical connection to resistance wire 18.
The heating arrangement further includes a heat distributing element in the form of a flex~ble, tubular member 22 encased in element 12, as by being arranged in ca~ity 14, and constructed from a suitable, known non conductive material. It is to be understood that by non-conductive as used herein and in the claims, is meant non-electrically conductLng materials, many suitable such materials being known to those skilled in the artO Member 22 is arrang~d e~ending in a folded condition along the length of plate element 12 for flexing therewith. Resi~tance wire 18 is srranged extending through tubular member 22 for generating heat in response ~o a flow of electrical current through wire 18. Blade elemant l? i9 elongated, as illustrated, with re6istance wire 18 also being elongated and having a length substantially exceeding ~he elongated length of element 12. Member 22 includes a plurality of parallel portions, or legs, e~tending substantially the elongated length of blade element 12 and spaced from one another transversely to the elongated blade length. Wire 18 has opposite end por~ions 24 and 26 arranged projecting from member 2Z at the ends of the latter. End portion 24 is illustrated as connected to a lead-in connection 28, while end portion 26 may be connected to a suitable ground wire 30. It will be appreciated that while ground wire 30 may be connected to a vehicle (not shown) with which assembly 10 is employed, wire 30 may also be attached to the holder of assembly 10 to be described below.
As perhaps can best be seen from Figure 4 of the drawings, heating arrangement 16 still further includes a non-conduc~ive coil 32 arranged ~L~3~6~
encircling member 22 for holding the latter in the lllustrated f~lded condi-tion such that member 22 will uniformly distribute heat transferred thereto from resistance wire 18. Coil 32 is also advantageously completely encased in element 12 as by being arranged entirely in cavity 14 of element 12.
Lead-in connection 2B includes a flexible non-conductive tube 34, with ground wire 30 and a conductor wire 26 coiled about tube 34 and each held in electrical contact by coupling arrangement 20 with a respective one of the end portions 24, 26 of wire 18. Conductive, tubul~r coupling elements 37, 37' electrically connect the wire 30 and conductor 36 to end portions 24, 26, and thus form arrangement 20. A heat resiætant sheathing 38, which is also con-structed from conventional materials commonly used for such purposes, encases the coiled conductors 30 and 36 and extends into the opening in the end of element 12 which communicates with cavity 14. Blade element 12 is provided with a head portion 40, and an electrically conductive, rigid blade holder 42 is arranged retainingly embracing portion 40 for permitting attachment of blade element 12 to a conventional windshield wiper arm ~not shown).
Referring now to Figures 3 and 6 of the drawings, a plurality of holes 44 and 46 are provided in blade element 12 so as to form a pair of rows.
The holes 44 and 46 are arranged communicating with cavity 14 along coextensive sldes of element 12. Advantageously, the holes 44, 4h extend out of element 12 along parallel ledges 48 and 50. In ~his manner, water, or a similar fluid, may be fed through tubes 34 and 52 snd into cavity 14 for being heated by heat-ing arrangement 16 as desired and then forced by the continued feeding of water into cavity 14 to exit through holes 44 and 46 directly onto a windshield (not shown) being treated.
Resistance wire ~8, which may be constructed from a heat and corrosion-resistant nickel ba~e alloy that contains high percentages of chromium, is supplied with electrical current from the electrical sys~em ~not shown) of a vehicle associated with wiper assembly 10. In this manner, heat will be generated internally of blade element 12 by wire 18 and transferred therefrom through tubular member 22 for distribution within blade element 12.
In order to more uniformly distribute the heat throughout the bl~de element 12, the non-conductive coil 32, which may be made from copper wire, and the ~39~16~
like, encircles the parallel spaced portions of member 22 in its folded con-dition and is thereby operative also to hold wire 18 and tubular member 22 assembled in their folded arrangemant. Thus, the entire heating arrangement 16 extends lengthwise and transversely through blade element 12 terminating in close spaced proximity to the opposite lon~itudinal ends of element 12 so as to dissipate heat uniformly therealong and to flex with element 12 as it moves over the windshield surface. Blade element 12 is advantageously con-structed of any suitable heat resistant material such as a silicone rubber capable of withstanding extreme temperaeure varlations as for example exempli-fied by a temperature range of -85F to 700F. Enc~sed within the lead-in sheathing 38 is the tubular coupling arrangement 20 by means of which the proJecting end portion 24 of resistance wlre lô is connected to the lead-in connection 28. Blade element 12 advanta~eouQly tapers toward a relatively narrow contac~ e~d from head portion 40 in cross section. Tne wiper opposite head portion 40 is embraced by holder 42, whlch is itself generally channel-shaped in cross section and has inwardly extending portions received within aligned longitudinal grooves formed in the flexible blade element 12. Tubular member 22 ~ay be constructed from a non-conductive material such as flexible glass or a suitable plastic, and is disposed in a folded condition within blade alement 12. Multiple folds are illustrated for member 22, as member 22 has an unfolded length substantially exceeding the length of ~lsde element 12 and yet is spaced from the blade contact end 54 and from holder 42.
Flexible, non-conductive tube 34 may be constructed from rubber, and the like, about which is coiled conductor 36, which may be copper wire and the like, through which curren~ Is conducted for supplying resistance wire 18.
The non-conductive sheathing 38, which may be constructed from the same heat resistant material a~ blade element 12, encases conductor 36~ ground 30, and tube 34 and holds the ground 30 and conductor 36 in contact with end portions 24 and 26. Heat 10QS outside of that generated within blade element 12 is thereby held to a minimum.
From the foregoing description, the construction, operation, and utility of the heated wiper blade assembly 10 will be apparent. It will there-fore be appreciated, that the construction of the wiper blade may be tailored ~L~3946~
to any part$cular installation requirements by varying the gauge of reslstance wire 18, the number of folds or leng~hs ~hereof and the choice of materials available having generally the same properties as specified in connection with the various parts described. Nith existing materials now available and the vehicle battery sources of electrical energy in common use, the construction of the present invention provides a more practiced means for producing the requisite heating. Also, the more even distribution of heat dissipated by blade asseMbly 10 achieves the objeetives of the invention in a most efficient man~er.
This invention relates generally to an electrically heated windshield : wiper assembly, and particularly ~o such a wiper assembly having an internal cavity through which he~ted and unheated water may flow to an associated wind-shield. Advantageously, the wiper assembly according to the present invention embodies heat and water facilities for facilitating removal of ice and precipi-tation under freezing conditions from the windshield of a vehîcle, and also to ~he removal of highway grime in summer by means of heat and water used in appropriate combination.
An object of the present invention is to provide a heated type of wiper blade construction capable of dissipating a requisite quantity o heat and water onto an associated windshield being wiped by the blade in a more efficient manner than known wiper blades of this kind so as to reduce the drain of elec~rical energy ~o ~ lower and more practical value for vehicle installa-tions. It is another object of the present invention to provide a wiper blade construction wherein the heating facilities are mounted in a novel manner for uniform distribution of the heat.
It ls yet another object of the present invention to provide a heated wiper blade construction which is economical in cost and capable of being tailored to various installational requirements.
It is yet another ob~ect of the present inven~ion to provide a wiper blade assembly through which heat and/or water may be distributed onto a surface being wiped, so as to fac~litate the cleaning process of the windshield without was~ing the supply of vehicular water.
Thesa and o1:her obJects are achie~ed according to the present inven-; tion by providing 8 heated windshield wiper assembly having: a hest resistant flexible blade element provided with an internal cavity for receiving ~ater;
and an electrical heating assembly encased ln the blade element for unifonmly distributing heat throughout the blade element and heating water in the cavity.
The heating arrangement advantageously includes a resista~ce element coupled to 8 source of electrical energy.
The heating arrangement advantageously further includes a heat distributing element in the form of a flexible, tubular member encased in the blade element and constructed from a non-conductive material. The tubular ~L~3~6~L
member may be arr~nged extending in a folded condition along the length of the blade element for flexing therewith. The resistance element will include a resistan~e wire extending through the tubular member and arranged for generating heat in responsa to a ~low of electrical current through the resistance wire.
The heating arrangement still further advantageously includes a non-conductive coil arranged encircling the tubular member for holding same in the folded condition, whereby heat is uniformly distribu~ed throughout the blade element.
The blade element preferably has a head portion, and a conduo~ive, rigid blade holder is arranged retainingly embracing the head portion of the blade element for fa ilitating attachment of the blade element ~o a wiper arm.
According to a preferred construction of the present in~ention, the resistance wire has a length substantislly exceeding the length of elongation of the blade element, and the tubular member includes a plurality of parallel portions extending substantially the elongated length of the blade and spaced from one another transversely to the elongated blade length.
A plurality of holes are advantageously provided in the blade element these holes being arranged com~unicating with the cavity along cnextensive sides of the blade element. In this manner, water being fed into the cavity in the blade eleme~t will exit through the holes and onto a windshield~ and the ~ike, being treated.
Figure 1 is a perspective view showing a windshield wiper assembly according to the present invention.
Figure 2 is a fragmentary, sectional view taken generally along the line 2-2 of Figure 1.
Figure 3 is a sectional view taken generally along the line 3-3 of Figure 2.
Figure 4 is a fragmentary, perspective view showing a portion of the heating element according to the present invention.
Figure 5 i8 a fragmentary, perspective view similar to the left end of Figure 1, but drawn to a larger scale and having some parts removed.
Figure 6 is a fragmentary, bottom plan view of the wiper blade element according to the present invention.
~39~6~
Referring now more par~icularly to Figures 1 thr~ugh 3 of the draw-ings, a heated windshield wiper assembly 10 according to the presen~ invention has a heat resistant flexible blade element 12 provided with an internal cavity 14 arranged for receiving water and similar fluids. An electrical heating arrangement 16 is encased in element 12 for uniformly distributing heat through-out elemént 12 and heating water (not shown) in cavity 14. As illustrated, heating arrangement 16 is advantageously arranged in cavity 14, and arrangement 16 lncludes a resistance wire 18 connectible to the, for e~ample, electrical system (not shown~ of the vehicle (nok shown) on which assembly 10 is used a~
by a coupling arrangement 20 arranged for establishing a grounded electrical connection to resistance wire 18.
The heating arrangement further includes a heat distributing element in the form of a flex~ble, tubular member 22 encased in element 12, as by being arranged in ca~ity 14, and constructed from a suitable, known non conductive material. It is to be understood that by non-conductive as used herein and in the claims, is meant non-electrically conductLng materials, many suitable such materials being known to those skilled in the artO Member 22 is arrang~d e~ending in a folded condition along the length of plate element 12 for flexing therewith. Resi~tance wire 18 is srranged extending through tubular member 22 for generating heat in response ~o a flow of electrical current through wire 18. Blade elemant l? i9 elongated, as illustrated, with re6istance wire 18 also being elongated and having a length substantially exceeding ~he elongated length of element 12. Member 22 includes a plurality of parallel portions, or legs, e~tending substantially the elongated length of blade element 12 and spaced from one another transversely to the elongated blade length. Wire 18 has opposite end por~ions 24 and 26 arranged projecting from member 2Z at the ends of the latter. End portion 24 is illustrated as connected to a lead-in connection 28, while end portion 26 may be connected to a suitable ground wire 30. It will be appreciated that while ground wire 30 may be connected to a vehicle (not shown) with which assembly 10 is employed, wire 30 may also be attached to the holder of assembly 10 to be described below.
As perhaps can best be seen from Figure 4 of the drawings, heating arrangement 16 still further includes a non-conduc~ive coil 32 arranged ~L~3~6~
encircling member 22 for holding the latter in the lllustrated f~lded condi-tion such that member 22 will uniformly distribute heat transferred thereto from resistance wire 18. Coil 32 is also advantageously completely encased in element 12 as by being arranged entirely in cavity 14 of element 12.
Lead-in connection 2B includes a flexible non-conductive tube 34, with ground wire 30 and a conductor wire 26 coiled about tube 34 and each held in electrical contact by coupling arrangement 20 with a respective one of the end portions 24, 26 of wire 18. Conductive, tubul~r coupling elements 37, 37' electrically connect the wire 30 and conductor 36 to end portions 24, 26, and thus form arrangement 20. A heat resiætant sheathing 38, which is also con-structed from conventional materials commonly used for such purposes, encases the coiled conductors 30 and 36 and extends into the opening in the end of element 12 which communicates with cavity 14. Blade element 12 is provided with a head portion 40, and an electrically conductive, rigid blade holder 42 is arranged retainingly embracing portion 40 for permitting attachment of blade element 12 to a conventional windshield wiper arm ~not shown).
Referring now to Figures 3 and 6 of the drawings, a plurality of holes 44 and 46 are provided in blade element 12 so as to form a pair of rows.
The holes 44 and 46 are arranged communicating with cavity 14 along coextensive sldes of element 12. Advantageously, the holes 44, 4h extend out of element 12 along parallel ledges 48 and 50. In ~his manner, water, or a similar fluid, may be fed through tubes 34 and 52 snd into cavity 14 for being heated by heat-ing arrangement 16 as desired and then forced by the continued feeding of water into cavity 14 to exit through holes 44 and 46 directly onto a windshield (not shown) being treated.
Resistance wire ~8, which may be constructed from a heat and corrosion-resistant nickel ba~e alloy that contains high percentages of chromium, is supplied with electrical current from the electrical sys~em ~not shown) of a vehicle associated with wiper assembly 10. In this manner, heat will be generated internally of blade element 12 by wire 18 and transferred therefrom through tubular member 22 for distribution within blade element 12.
In order to more uniformly distribute the heat throughout the bl~de element 12, the non-conductive coil 32, which may be made from copper wire, and the ~39~16~
like, encircles the parallel spaced portions of member 22 in its folded con-dition and is thereby operative also to hold wire 18 and tubular member 22 assembled in their folded arrangemant. Thus, the entire heating arrangement 16 extends lengthwise and transversely through blade element 12 terminating in close spaced proximity to the opposite lon~itudinal ends of element 12 so as to dissipate heat uniformly therealong and to flex with element 12 as it moves over the windshield surface. Blade element 12 is advantageously con-structed of any suitable heat resistant material such as a silicone rubber capable of withstanding extreme temperaeure varlations as for example exempli-fied by a temperature range of -85F to 700F. Enc~sed within the lead-in sheathing 38 is the tubular coupling arrangement 20 by means of which the proJecting end portion 24 of resistance wlre lô is connected to the lead-in connection 28. Blade element 12 advanta~eouQly tapers toward a relatively narrow contac~ e~d from head portion 40 in cross section. Tne wiper opposite head portion 40 is embraced by holder 42, whlch is itself generally channel-shaped in cross section and has inwardly extending portions received within aligned longitudinal grooves formed in the flexible blade element 12. Tubular member 22 ~ay be constructed from a non-conductive material such as flexible glass or a suitable plastic, and is disposed in a folded condition within blade alement 12. Multiple folds are illustrated for member 22, as member 22 has an unfolded length substantially exceeding the length of ~lsde element 12 and yet is spaced from the blade contact end 54 and from holder 42.
Flexible, non-conductive tube 34 may be constructed from rubber, and the like, about which is coiled conductor 36, which may be copper wire and the like, through which curren~ Is conducted for supplying resistance wire 18.
The non-conductive sheathing 38, which may be constructed from the same heat resistant material a~ blade element 12, encases conductor 36~ ground 30, and tube 34 and holds the ground 30 and conductor 36 in contact with end portions 24 and 26. Heat 10QS outside of that generated within blade element 12 is thereby held to a minimum.
From the foregoing description, the construction, operation, and utility of the heated wiper blade assembly 10 will be apparent. It will there-fore be appreciated, that the construction of the wiper blade may be tailored ~L~3946~
to any part$cular installation requirements by varying the gauge of reslstance wire 18, the number of folds or leng~hs ~hereof and the choice of materials available having generally the same properties as specified in connection with the various parts described. Nith existing materials now available and the vehicle battery sources of electrical energy in common use, the construction of the present invention provides a more practiced means for producing the requisite heating. Also, the more even distribution of heat dissipated by blade asseMbly 10 achieves the objeetives of the invention in a most efficient man~er.
Claims (9)
1. A heated windshield wiper assembly, comprising, in combination:
(a) a heat resistant flexible blade element having an internal cavity arranged for receiving water; and (b) electrical heating means encased in the blade element for uniformly distributing heat throughout the blade element and heating water in the cavity, the heating means including:
(i) a resistance element;
(ii) coupling means for establishing a grounded electrical connection to the resistance element, the heating means further including a heat distributing element in the form of a flexible, tubular member encased in the blade element and constructed from a non-conductive material, the tubular member arranged extending in a folded condition along the length of the blade element for flexing therewith, the heating means still further including a non-conductive coil means encircling the tubular member in folded condition for holding the tubular member in its folded condition and assuring uniform distri-bution of heat transferred from the resistance wire throughout the blade element, the coil means being completely encased in the blade element; and (c) a plurality of holes provided in the blade element, the holes being arranged communicating with the cavity along coextensive sides of the blade element, water being fed from the tube into the cavity in the blade element for exiting through the holes.
(a) a heat resistant flexible blade element having an internal cavity arranged for receiving water; and (b) electrical heating means encased in the blade element for uniformly distributing heat throughout the blade element and heating water in the cavity, the heating means including:
(i) a resistance element;
(ii) coupling means for establishing a grounded electrical connection to the resistance element, the heating means further including a heat distributing element in the form of a flexible, tubular member encased in the blade element and constructed from a non-conductive material, the tubular member arranged extending in a folded condition along the length of the blade element for flexing therewith, the heating means still further including a non-conductive coil means encircling the tubular member in folded condition for holding the tubular member in its folded condition and assuring uniform distri-bution of heat transferred from the resistance wire throughout the blade element, the coil means being completely encased in the blade element; and (c) a plurality of holes provided in the blade element, the holes being arranged communicating with the cavity along coextensive sides of the blade element, water being fed from the tube into the cavity in the blade element for exiting through the holes.
2. A structure as defined in claim 1, wherein the blade element has a head portion, and further including a conductive, rigid blade holder arranged retainingly embracing the head portion of the blade element.
3. A structure as defined in claim 1, wherein the heat distributing element includes a resistance wire extending through the tubular member and arranged for generating heat in response to a flow of electrical current through the resistance wire.
4. A structure as defined in claim 3, wherein the blade element is elongated, the resistance wire is elongated and has a length substantially exceeding the elongated length of the blade element, and the tubular member includes a plurality of parallel portions extending substantially the elongated length of the blade element and spaced from one another transversely to the elongated blade element length.
5. A structure as defined in claim 3, wherein the heating means resistance wire has opposite end portions projecting from the tubular member, the end portions being respectively connected to a lead-in connection and to ground.
6. A structure as defined in claim 5, wherein the lead-in connection includes a flexible, non-conductive tube, a conductor coiled about the tube and held in electrical contact by the coupling means with one of the end por-tions of the resistance wire within the blade element, and a heat resistant sheath encasing the coiled conductor and extending into the blade element.
7. A structure as defined in claim 6, wherein the heating means further includes a non-conductive coil means encircling the tubular member in folded condition for holding the tubular member in the folded condition and assuring uniform distribution of heat transferred from the resistance wire throughout the blade element, the coil means being completely encased in the blade element.
8. A structure as defined in claim 7, wherein the blade element has a head portion, and further including a conductive, rigid blade holder arranged retainingly embracing the head portion of the blade element.
9. A structure as defined in claim 7, wherein the blade element is elongated, the resistance wire is elongated and has a length substantially exceeding the elongated length of the blade element, and the tubular member includes a plurality of parallel portions extending substantially the elongated length of the blade element and spaced from one another transversely to the elongated blade element length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA240,669A CA1039461A (en) | 1975-11-27 | 1975-11-27 | Wiper blade with embedded heating element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA240,669A CA1039461A (en) | 1975-11-27 | 1975-11-27 | Wiper blade with embedded heating element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039461A true CA1039461A (en) | 1978-10-03 |
Family
ID=4104611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA240,669A Expired CA1039461A (en) | 1975-11-27 | 1975-11-27 | Wiper blade with embedded heating element |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1039461A (en) |
-
1975
- 1975-11-27 CA CA240,669A patent/CA1039461A/en not_active Expired
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