Patent Application
20240308471
Windshield wipers are used to remove rain, snow, ice, washer fluid, water, and/or other debris from a vehicle's front or rear windshield. Almost all vehicles are equipped with one or more windshield wipers, including cars, trucks, buses, train locomotives, watercraft (e.g., those with a cabin) and even some aircraft. In many jurisdictions, windshield wipers are a legal requirement.
Vehicles use a variety of wiper blade types and configurations, but a common objective for all wiper blade types is that they conform to the surface and/or contour of the glass upon which they are mounted (whether a front or rear windshield). That is, many vehicles use a curved glass, which cannot be wiped effectively with a rigid, linear wiper blade. To address this, a common type of wiper blade incorporates a metal framework that serves as a mount for the actual wiper, which can be a metal-backed strip of, for example, rubber or halogen-hardened rubber. The metal framework is shaped and/or includes spring arms to bias portions of the wiper to ensure contact is maintained between the wiper and the windshield during operation.
Despite advancements to date, a need exists for wiper blade that better conforms to the shape and/or contour of a windshield.
The present disclosure relates generally to an improved wiper blade, substantially as illustrated by and described in connection with at least one of the figures, as set forth more completely in the claims. More specifically, the present disclosure relates to a wiper blade that better conforms to the shape and/or contour of a windshield.
The foregoing and other objects, features, and advantages of the devices, systems, and methods described herein will be apparent from the following description of particular examples thereof, as illustrated in the accompanying figures; where like or similar reference numbers refer to like or similar structures. The figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the devices, systems, and methods described herein.
References to items in the singular should be understood to include items in the plural, and vice versa, unless explicitly stated otherwise or clear from the text. Grammatical conjunctions are intended to express any and all disjunctive and conjunctive combinations of conjoined clauses, sentences, words, and the like, unless otherwise stated or clear from the context. Recitation of ranges of values herein are not intended to be limiting, referring instead individually to any and all values falling within and/or including the range, unless otherwise indicated herein, and each separate value within such a range is incorporated into the specification as if it were individually recited herein. In the following description, it is understood that terms such as “first,” “second,” “top,” “bottom,” “side,” “front,” “back,” and the like are words of convenience and are not to be construed as limiting terms. For example, while in some examples a first side is located adjacent or near a second side, the terms “first side” and “second side” do not imply any specific order in which the sides are ordered.
The terms “about,” “approximately,” “substantially,” or the like, when accompanying a numerical value, are to be construed as indicating a deviation as would be appreciated by one of ordinary skill in the art to operate satisfactorily for an intended purpose. Ranges of values and/or numeric values are provided herein as examples only, and do not constitute a limitation on the scope of the disclosure. The use of any and all examples, or exemplary language (“e.g.,” “such as,” or the like) provided herein, is intended merely to better illuminate the disclosed examples and does not pose a limitation on the scope of the disclosure. The terms “e.g.,” and “for example” set off lists of one or more non-limiting examples, instances, or illustrations. No language in the specification should be construed as indicating any unclaimed element as essential to the practice of the disclosed examples.
The term “and/or” means any one or more of the items in the list joined by “and/or.” As an example, “x and/or y” means any element of the three-element set {(x), (y), (x, y)}. In other words, “x and/or y” means “one or both of x and y”. As another example, “x, y, and/or z” means any element of the seven-element set {(x), (y), (z), (x, y), (x, z), (y, z), (x, y, z)}. In other words, “x, y, and/or z” means “one or more of x, y, and z.”
Wiper blades used in vehicles vary in size and shape. In some cases, wiper blades can be the same shape, but will vary in size. While wiper blades are most often associated with automobiles (e.g., cars, trucks, etc.), they are likewise employed in numerous other vehicles, such as trains, watercraft, and aircraft. Therefore, the following disclosure should not be limited to wiper blades and wiper arms used in automobiles, but rather would be applicable to wiper blades and wiper arms used in any type of vehicle.
The present disclosure relates to a windshield wiper blade that can be fabricated from a single material using a structural topology optimization.
In one example, a wiper blade comprises a frame structure, a squeegee having a wiping lip, and a plurality of branches extending between the frame structure and the squeegee. The plurality of branches is configured to manage compression and tension loads between the frame structure and the squeegee. In some examples, the plurality of branches vary in thickness to conform the wiping lip to a windshield. For example, the plurality of branches can comprise a plurality of inter-connected members coupled between the frame structure and the squeegee and one or more cross-connected member coupled between two or more adjacent inter-connected members. In an unloaded condition, the frame structure is curved and the squeegee is linear.
In some examples, the frame structure and the squeegee are an integrated component, but in another example, the frame structure, the squeegee, and the plurality of branches is an integrated component. In some examples, the plurality of branches can be configured as a removable insert. The plurality of branches can be arranged to form a truss structure, a bird's nest, and/or a woven pattern. In some examples, the plurality of branches is fabricated via an additive manufacturing technique. For example, the plurality of branches can be fabricated using one or more of thermoplastic polyurethane (TPU), thermoplastic vulcanizates (TPV), thermoplastic elastomers (TPE), and silicon.
In some examples, two or more components of the windshield wiper blade 104 can be formed from the same material and/or as a single, integrated component. In the illustrated example, the frame structure 202 and squeegee 206 are formed as a single component; however, it is contemplated that the frame structure 202 and squeegee 206 can be fabricated as separate components and then coupled together (e.g., via one or more fasteners, adhesives, etc.). Likewise, it is contemplated that the frame structure 202, the plurality of branches 204, and the squeegee 206 can be formed from the same material and/or as a single, integrated component. Therefore, the windshield wiper blade 104 and components thereof may be formed as a unitary structure.
In some examples, the frame structure 202, the plurality of branches 204, and the squeegee 206 may be a printed plastic material component (e.g., thermoplastic, TPU, FPU, etc.). Printed plastic material components can be printed with great accuracy and with numerous details, which is particularly advantageous, for example, in creating components requiring complex and/or precise features, such as the plurality of branches 204. In addition, additive manufacturing techniques obviate the need for mold tooling, thereby lowering up-front manufacturing costs, which is particularly advantageous in low-volume productions. In some examples, the windshield wiper blade 104 may be fabricated using material extrusion (e.g., fused deposition modeling (FDM)), stereolithography (SLA), selective laser sintering (SLS), material jetting, binder jetting, powder bed fusion, directed energy deposition, VAT photopolymerisation, and/or any other suitable type of additive manufacturing/3D printing process.
Additive manufacturing techniques print objects in three dimensions, therefore both the minimum feature size (i.e., resolution) of the X-Y plane (horizontal resolution) and the layer height in Z-axis (vertical resolution) are considered in overall printer resolution. Horizontal resolution is the smallest movement the printer's extruder can make within a layer on the X and the Y axis, while vertical resolution is the minimal thickness of a layer that the printer produces in one pass. Printer resolution describes layer thickness and X-Y resolution in dots per inch (DPI) or micrometers (μm). The particles (3D dots) in the horizontal resolution can be around 50 to 100 μm (510 to 250 DPI) in diameter. Typical layer thickness (vertical resolution) is around 100 μm (250 DPI), although the layers may be as thin as 16 μm (1,600 DPI). The smaller the particles, the higher the horizontal resolution (i.e., higher the details the printer produces). Similarly, the smaller the layer thickness in Z-axis, the higher the vertical resolution (i.e., the smoother the printed surface will be).
A printing process in a higher vertical resolution printing, however, will take longer to produce finer layers as the printer has to produce more layers. In some examples, therefore, one or more portions of the wiper blade 104 may be formed or otherwise fabricated at different resolutions during a printing operation. For example, the plurality of branches 204 portion may be printed at a higher resolution than that of the frame structure 202 and the squeegee 206 (or vice versa) as needed for a particular application.
As illustrated in
As illustrated, the plurality of branches 204 may be of varying thicknesses and oriented in different directions to manage compression and tension loads between the frame structure 202 and squeegee 206. In some examples, the plurality of branches 204 is arranged to form a truss structure, a bird's nest, or a woven pattern. For example, in the illustrated example, the plurality of branches 204 generally comprises a plurality of inter-connected members 204a coupled between the frame structure 202 and the squeegee 206 and one or more cross-connected member 204b coupled between two or more adjacent inter-connected members 204a. The plurality of inter-connected members 204a can be perpendicular or diagonal relative to the squeegee 206.
The plurality of branches 204 can vary in thickness and can be designed to deform under specific loading. The size and distribution of the plurality of branches 204 can therefore be adjusted to provide a desired pressure distribution curve. Such a controlled deformation allows the frame structure 202 to support the squeegee 206 and ensure the wiping lip 208 conforms to the windshield 102 properly. For example, additional and/or larger branches 204 can be positioned at areas along the squeegee 206 where addition rigidity/pressure from the wiping lip 208 is desired upon the windshield 102. The wiping lip 208 can be a rubber-elastic wiper strip that is located substantially longitudinally axially parallel on said squeegee 206. In some examples, the squeegee 206 (e.g., the wiping lip 208) and/or the plurality of branches 204 can be include or more coatings, such as a hydrophobic and/or non-stick coating.
Providing the plurality of branches 204 as a removable insert 304 can offer certain benefits. For example, because the shape and/or contour of a windshield 102 is not standardized, a single frame assembly 302 component can be sold where the consumer can select the removable insert 304 (or reuse a removable insert 304) that provides a pressure distribution curve that is most effective for a given windshield 102. The frame assembly 302 and the removable insert 304 can be then joined together by the consumer using, for example, one or more snaps, clips, or other fittings. In some examples, the single frame assembly 302 component can be sold alone and the consumer can purchase and/or download a computer-aided design (CAD) file associated with a removable insert 304 that provides a pressure distribution curve that is most effective for a given windshield 102. The consumer can then print the removable insert 304 via an additive manufacturing/3D printing technique or process at home or at a local 3D printing center.
While the present method and/or system has been described with reference to certain implementations, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present method and/or system. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from its scope. For example, block and/or components of disclosed examples may be combined, divided, re-arranged, and/or otherwise modified. Therefore, the present method and/or system are not limited to the particular implementations disclosed. Instead, the present method and/or system will include all implementations falling within the scope of the appended claims, both literally and under the doctrine of equivalents.
The present application claims priority to U.S. Provisional Patent Application No. 63/452,510, filed Mar. 16, 2023, and entitled “Wiper Blade Assembly” which is hereby incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63452510 | Mar 2023 | US |
