Patent Application
20190192267
The present disclosure is directed generally to a brush head assembly with bristle tufts retained within an elastomeric matrix, as well as to methods for manufacturing the brush head assembly.
Periodontal diseases are thought to be infectious diseases caused by bacteria present in dental plaques. Removal of dental plaques is highly important for the health of oral cavities. Tooth brushing is a highly effective method to remove dental plaque from the teeth. Power toothbrushes can enhance the removal of dental plaque. Such power toothbrushes have a set of bristles attached to a brush head which is moved by a driver that causes the bristles to scrub dental surfaces.
To improve oral care, it is desirable to provide a toothbrush with bristles packed as densely as possible. Densely packed bristles improve oral care, improve the removal of dental plaque from the teeth, and improve the cleaning of other dental surfaces. Bristle density may be increased by, for example, increasing the number of bristles in a tuft, or by increasing the number of tufts on a brush head, both of which can be accomplished without increasing the size of the brush head.
However, for structural reasons, including maintaining the structural strength and integrity of the brush head, a minimum distance must be maintained between tuft holes. As a result, there is a limit as to how big the bristle tufts can be, and how many bristle tufts can be placed on a brush head of a certain size. These structural requirements therefore limit the overall density of the bristles on the brush head.
Accordingly, there is a need in the art for brush head assemblies, and methods of their manufacture, that increase the density of the bristles on the brush head and therefore improve oral care.
The present disclosure is directed to inventive brush heads with densely packed bristle tufts permanently retained within an elastomeric matrix without a retention element such as a ring, sleeve, or anchor. Various embodiments and implementations herein are directed to brush heads in which bristle tufts are affixed with or to a hard platen and are then embedded within an elastomeric matrix resulting in a completed brush head. Using the various embodiments and implementations herein, cost-effective and efficient production of brush heads with secured bristle tufts is substantially improved. For example, in some embodiments, the manufacturing method includes inserting a tuft of bristles into a hard platen, securing the bristle tuft to the hard platen, and at least partially encompassing the hard platen and the bristle tuft in an elastomeric matrix.
The brush heads disclosed and described herein can be used with any manual or power toothbrush device. One example of a power toothbrush device that the brush head can be used with Sonicare® devices available from Koninklijke Philips Electronics N.V. This oral care device is based upon an actuator with a reciprocating brush head including bristles to provide an effective cleaning of a user's teeth.
Generally in one aspect, a brush head assembly includes: (i) a hard platen; (ii) a plurality of bristle tufts, each of which comprises a plurality of bristle strands having a proximal end and a free end; and (iii) an elastomeric matrix bonded to the hard platen and a portion of the proximal end of each bristle tuft, wherein each of the plurality of bristle tufts is bonded at its proximal end directly to the elastomeric matrix without a retention element.
According to an embodiment, the bristle strands are made of nylon.
According to an embodiment, the bristle strands are coated with a polymer that promotes bonding of the bristle tufts to the elastomeric matrix. According to an embodiment, the polymer is selected from the group consisting of polyurethane, polybutylene terephthalate, polyolefin, and combinations thereof.
Generally, in one aspect, a brush head assembly includes: (i) a hard platen comprising a plurality of bristle tuft holes; (ii) a plurality of bristle tufts, each of which comprises a plurality of bristle strands having a proximal end and a free end, wherein each of the plurality of bristle tufts are inserted into a respective one of the bristle tuft holes; and (iii) an elastomeric matrix that at least partially encompasses the hard platen and the proximal end of the bristle tufts.
According to an embodiment, the bristle tufts are fused to the bristle tuft holes.
According to an embodiment, the hard platen is a portion of the neck of the brush head.
According to an embodiment, the brush head includes a second hard platen, and the elastomeric matrix is formed between the hard platen and the second hard platen.
According to an embodiment, the elastomeric matrix completely encompasses the hard platen and the proximal end of the bristle tufts.
According to an embodiment, the bristles are made of nylon, and the elastomeric matrix is a flexible thermoplastic elastomer.
Generally, in one aspect, a method for manufacturing a brush head includes the steps of: (i) providing a hard platen comprising a plurality of bristle tuft holes; (ii) inserting a respective bristle tuft proximal end into each of the bristle tuft holes; and (iii) injecting a thermoplastic elastomer to create an elastomeric matrix that at least partially encompasses the hard platen and the proximal end of the bristle tufts.
According to an embodiment, the method further includes the step of applying heat to each bristle tuft proximal end at a temperature sufficient to at least partially fuse the bristle tuft proximal end to the bristle tuft hole.
Generally, in one aspect, a method for manufacturing a brush head includes the steps of: (i) positioning a proximal end of each of a plurality of bristle tufts into a plate; (ii) injecting a thermoplastic elastomer to create an elastomeric matrix that at least partially encompasses each of the plurality of bristle tufts; (iii) removing the plate to expose the proximal end of each of the plurality of bristle tufts extending from the elastomeric matrix; and (iv) applying heat to each bristle tuft proximal end at a temperature sufficient to at least partially melt the bristle tuft proximal end and create a proximal head portion.
According to an embodiment, the method further includes the step of injecting additional thermoplastic elastomer to encompass the proximal head portion of each of the plurality of bristle tufts.
It should be appreciated that all combinations of the foregoing concepts and additional concepts discussed in greater detail below (provided such concepts are not mutually inconsistent) are contemplated as being part of the inventive subject matter disclosed herein. In particular, all combinations of claimed subject matter appearing at the end of this disclosure are contemplated as being part of the inventive subject matter disclosed herein.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment(s) described hereinafter.
In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.
The present disclosure describes various embodiments of a brush head assembly with bristle tufts retained within an elastomeric matrix, and methods of their manufacture. More generally, Applicants have recognized and appreciated that it would be beneficial to provide a brush head formed from an elastomeric matrix to provide movement while improving bristle retention, without simultaneously requiring a retention element such as a ring, sleeve, anchor, or webbing. For example, bristle tuft packing placement can restrict or enhance movement of a flexible elastomeric matrix, which can be beneficial to a brush head's function, especially in powered toothbrush devices. A particular goal of utilization of certain embodiments of the present disclosure is the ability to efficiently manufacture brush heads with improved retention of the bristle tuft.
In view of the foregoing, various embodiments and implementations are directed to a brush head assembly in which a bristle tuft is affixed to or within an elastomeric matrix without a retention element such as a ring, sleeve, anchor, or webbing. Alternatively, the bristle tuft is affixed to or within a hard platen and is then embedded at least partially within an elastomeric matrix.
Referring to
During use, forces are exerted on the bristles that can result in the bristles being removed or expelled from the bristle tuft. Accordingly, it is necessary to improve retention of bristles and bristle tufts within the brush head, including within the elastomeric matrix. Referring to
Referring to
According to another embodiment, the hard platen 24 can be designed to promote fusing of the elastomeric matrix to the platen. For example, if the platen is made from materials such as Spandex®, PolyMeg®, or similar copolymers, this would allow fusing of the elastomer matrix to the platen, thereby increasing retention forces. In addition, this design provides additional flexibility to the bristle tuft within the platen, and therefore additional degrees of freedom of motion within the brush head.
Referring to
Referring to
According to another embodiment, shown in
Referring to
In step 230 of method, an elastomeric material is molded over the proximal end head portion of the bristle tufts 21, and is bound to the hard platen 24. The molded elastomeric material forms an elastomeric matrix 30, as shown in
Referring to
In step 330 of the method, the thermoplastic elastomer is then molded over or around the hard platen 24 containing the bristle tufts to form the elastomeric matrix 30 within which the bristle tufts are retained, as shown in
Referring to
In step 430 of the method, the platen 24 is positioned in the proper location in relation to the head portion 26 of the bristle tufts. Platen 24 can be properly positioned using a mold, for example, or other positioning mechanism. And in step 440, an elastomeric material is molded over the platen 24 and the head portion 26 of the bristle tufts, to form an elastomeric matrix.
Referring to
In accordance with another embodiment, as shown in
All definitions, as defined and used herein, should be understood to control over dictionary definitions, definitions in documents incorporated by reference, and/or ordinary meanings of the defined terms.
The indefinite articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.”
The phrase “and/or,” as used herein in the specification and in the claims, should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified.
As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.”
As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified.
It should also be understood that, unless clearly indicated to the contrary, in any methods claimed herein that include more than one step or act, the order of the steps or acts of the method is not necessarily limited to the order in which the steps or acts of the method are recited.
In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively, as set forth in the United States Patent Office Manual of Patent Examining Procedures, Section 2111.03.
While several inventive embodiments have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the inventive embodiments described herein. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the inventive teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific inventive embodiments described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, inventive embodiments may be practiced otherwise than as specifically described and claimed. Inventive embodiments of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure.
This application is a divisional application of the U.S. National Phase application Ser. No. 15/127,897 filed Sep. 21, 2016, which claims priority under 35 U.S.C. § 371 from International Application No. PCT/IB2015/052131, filed on Mar. 24, 2015, which claims the benefit of U.S. Provisional Patent Application Nos. 62/025,039, filed on Jul. 16, 2014, 62/008,762, filed on Jun. 6, 2014, 61/974,760, filed on Apr. 3, 2014, 61/970,076, filed on Mar. 25, 2014, 61/970,011 filed on Mar. 25, 2014, 61/970,157, filed on Mar. 25, 2014, 61/970,169, filed on Mar. 25, 2014. These applications are hereby incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 62025039 | Jul 2014 | US | |
| 62008762 | Jun 2014 | US | |
| 61974760 | Apr 2014 | US | |
| 61970076 | Mar 2014 | US | |
| 61970011 | Mar 2014 | US | |
| 61970157 | Mar 2014 | US | |
| 61970169 | Mar 2014 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15127897 | Sep 2016 | US |
| Child | 16290263 | US |
