AERODYNAMIC WINDSHIELD WIPER ARM
An aerodynamic windshield wiper arm that includes an integrated aerodynamic element that causes down force to be applied to the wiper arm as the air speed across the wiper arm increases, such as in high winds and/or at high speeds. The aerodynamic element is integrally formed with the wiper arm such that it is not easily removed, unlike aerodynamic attachments. The wiper arm is formed using an injection molding process and a plastic material. The aerodynamic element may be in the form of an airfoil or a lip or any other shape capable of causing down force when high winds contact the wiper arm. The one-piece wiper arm provides improved functionality and improved aesthetics over previous wiper arms.
1 . A one-piece windshield wiper arm comprising:
a wiper arm; and
an aerodynamic element integrally formed with the wiper arm;
wherein the wiper arm and the aerodynamic element comprise an organic polymer.
2 . The windshield wiper arm of claim 1 , wherein the organic polymer is selected from a thermoplastic resin, a blend of thermoplastic resins, a thermosetting resin, or a blend of a thermoplastic resin with a thermosetting resin.
3 . The windshield wiper arm of claim 2 , wherein the organic polymer is selected from polyacetals, polyacrylics, polycarbonates, polystyrenes, polyesters, polyamides, polyamideimides, polyarylates, polyarylsulfones, polyethersulfones, polyphenylene sulfides, polyvinyl chlorides, polysulfones, polyimides, polyetherimides, polytetrafluoroethylenes, polyetherketones, polyether etherketones, polyether ketone ketones, polybenzoxazoles, polyoxadiazoles, polybenzothiazinophenothiazines, polybenzothiazoles, polypyrazinoquinoxalines, polypyromellitimides, polyquinoxalines, polybenzimidazoles, polyoxindoles, polyoxoisoindolines, polydioxoisoindolines, polytriazines, polypyridazines, polypiperazines, polypyridines, polypiperidines, polytriazoles, polypyrazoles, polypyrrolidines, polycarboranes, polyoxabicyclononanes, polydibenzofurans, polyphthalides, polyacetals, polyanhydrides, polyvinyl ethers, polyvinyl thioethers, polyvinyl alcohols, polyvinyl ketones, polyvinyl halides, polyvinyl nitriles, polyvinyl esters, polysulfonates, polysulfides, polythioesters, polysulfones, polysulfonamides, polyureas, polyphosphazenes, polysilazanes, or the like, or a combination including at least one of the foregoing organic polymers.
4 . The windshield wiper arm of claim 2 , wherein the organic polymer is selected from acrylonitrile-butadiene-styrene (ABS), polycarbonate, polycarbonate/ABS blend, a copolycarbonate-polyester, acrylic-styrene-acrylonitrile (ASA), acrylonitrile-(ethylene-polypropylene diamine modified)-styrene (AES), phenylene ether resins, glass filled blends of polyphenylene oxide and polystyrene, blends of polyphenylene ether/polyamide, blends of polycarbonate/PET/PBT, polybutylene terephthalate and impact modifier, polyamides, phenylene sulfide resins, polyvinyl chloride PVC, high impact polystyrene (HIPS), low/high density polyethylene, polypropylene and thermoplastic olefins (TPO), polyethylene and fiber composites, polypropylene and fiber composites, or a combination thereof.
5 . The windshield wiper arm of claim 1 , wherein the wiper arm has a curved shape and the aerodynamic element comprises one end of the curved wiper arm.
6 . The windshield wiper arm of claim 1 , wherein the wiper arm has a shape of a spoiler and the aerodynamic element comprises an airfoil.
7 . A method of forming a one-piece wiper arm comprising the steps of:
injection molding an organic polymer to form the wiper arm;
wherein the wiper arm comprises a wiper arm and an aerodynamic element integrally formed with the wiper arm.
8 . The method of claim 7 , wherein the organic polymer is selected from a thermoplastic resin, a blend of thermoplastic resins, a thermosetting resin, or a blend of a thermoplastic resin with a thermosetting resin.
9 . The method of claim 8 , wherein the organic polymer is selected from polyacetals, polyacrylics, polycarbonates, polystyrenes, polyesters, polyamides, polyamideimides, polyarylates, polyarylsulfones, polyethersulfones, polyphenylene sulfides, polyvinyl chlorides, polysulfones, polyimides, polyetherimides, polytetrafluoroethylenes, polyetherketones, polyether etherketones, polyether ketone ketones, polybenzoxazoles, polyoxadiazoles, polybenzothiazinophenothiazines, polybenzothiazoles, polypyrazinoquinoxalines, polypyromellitimides, polyquinoxalines, polybenzimidazoles, polyoxindoles, polyoxoisoindolines, polydioxoisoindolines, polytriazines, polypyridazines, polypiperazines, polypyridines, polypiperidines, polytriazoles, polypyrazoles, polypyrrolidines, polycarboranes, polyoxabicyclononanes, polydibenzofurans, polyphthalides, polyacetals, polyanhydrides, polyvinyl ethers, polyvinyl thioethers, polyvinyl alcohols, polyvinyl ketones, polyvinyl halides, polyvinyl nitriles, polyvinyl esters, polysulfonates, polysulfides, polythioesters, polysulfones, polysulfonamides, polyureas, polyphosphazenes, polysilazanes, or the like, or a combination including at least one of the foregoing organic polymers.
10 . The method of claim 8 , wherein the organic polymer is selected from acrylonitrile-butadiene-styrene (ABS), polycarbonate, polycarbonate/ABS blend, a copolycarbonate-polyester, acrylic-styrene-acrylonitrile (ASA), acrylonitrile-(ethylene-polypropylene diamine modified)-styrene (AES), phenylene ether resins, glass filled blends of polyphenylene oxide and polystyrene, blends of polyphenylene ether/polyamide, blends of polycarbonate/PET/PBT, polybutylene terephthalate and impact modifier, polyamides, phenylene sulfide resins, polyvinyl chloride PVC, high impact polystyrene (HIPS), low/high density polyethylene, polypropylene and thermoplastic olefins (TPO), polyethylene and fiber composites, polypropylene and fiber composites, or a combination thereof.
11 . The method of claim 7 , wherein the wiper arm has a curved shape and the aerodynamic element comprises one end of the curved wiper arm.
12 . The method of claim 7 , wherein the wiper arm has a shape of a spoiler and the aerodynamic element comprises an airfoil.
13 . The method of claim 7 , wherein the injection-molding step is a selected from a gas-assistant injection-molding process or water assisted injection-molding process.