Connector for manual oral care implement

Abstract

A connector for repeatedly attaching and detaching a head to and from a handle of a manual oral care implement, the connector having an outer surface and a recess. The groove forms a cavity within the connector, where the cavity includes a spring loaded ball snap element, the element including a ball and a spring that exerts a radial force on the ball in a direction toward the outer surface of the connector.

Description

[0001] This application is a divisional application of PCT patent application PCT / US2019 / 016214 (international application date February 1, 2019, priority date February 9, 2018, Chinese national application number 201980012441.4, invention title "Connector for Manual Oral Care Tool"), which entered the Chinese national phase on August 7, 2020. Technical Field

[0002] This disclosure relates to a connector for repeatedly attaching a head to and detaching from a handle of a manual oral care tool. This disclosure also relates to a handle of a manual oral care tool including such a connector, and to a manual oral care tool comprising such a handle and a head. Background Technology

[0003] The head and handle of oral care tools, such as manual toothbrushes, are well known in the art. Generally, bristle tufts or other cleaning elements for cleaning teeth and soft tissues in the mouth are attached to a bristle carrier or mounting surface designed for insertion into the user's mouth. The handle is typically attached to the head and is held by the user during brushing. Typically, the head of a manual toothbrush is permanently attached to the handle, for example, by injection molding the bristle carrier, handle, and neck connecting the head and handle in a single injection molding step. After the normal lifespan of the toothbrush, approximately three months of use, it is discarded. To provide an environmentally friendly / sustainable manual toothbrush that generates less waste when discarded, manual toothbrushes are known to include replaceable (i.e., repeatedly attached to and detachable from the handle) heads or head replacements. Consumers can reuse the handle and only purchase new head replacements instead of buying a brand new toothbrush. Such replacements are generally cheaper than conventional manual toothbrushes and generate less waste.

[0004] For example, a known manual toothbrush includes a handle to which a replaceable head is attached. The handle has a cavity into which the head can be inserted. To provide a sufficiently strong connection between the head and the handle, the brush head is formed with a neck having a coupling anchor having multiple grooves in a complementary engagement mechanism for engaging within a bushing in the handle.

[0005] However, this anchoring / engaging mechanism has a relatively complex external geometry that makes it difficult to clean after brushing. Toothpaste and slurry can accumulate in the grooves of the anchoring / engaging mechanism and may prevent the brush head from attaching precisely to the handle. Furthermore, this engagement mechanism does not provide sufficient torsional protection for the brush head on the handle during brushing.

[0006] Furthermore, connector solutions characterized by small plastic hooks that interact with corresponding holes are known. However, these plastic hooks loosen over time, and the user needs to actively push the hooks back parallel to pull the replacement to remove the brush head from the handle. This connector solution is neither intuitive nor convenient for consumers. Moreover, this connector is difficult to clean. Additionally, the engagement parts located within the brush replacement are necessary, leading to additional manufacturing costs and complexity.

[0007] If the brush head is not precisely attached / secured to the handle, for example because the connector is not adequately cleaned due to slurry and toothpaste buildup in the small grooves, and / or if the brush head twists open during brushing, the oral care tool will have poor maneuverability during brushing, thus hindering the user from reaching all areas of the mouth. Therefore, the overall maneuverability of the brush may be insufficient. However, to achieve and maintain good oral health, and to prevent gingivitis, it is important to thoroughly clean teeth and gums, especially in hard-to-reach areas (e.g., in the area of ​​the molars). Furthermore, the space between the teeth and periodontal tissues (the so-called gingival sulcus) must be thoroughly cleaned, which requires good and well-coordinated brushing technique that may not be achievable with the manual toothbrush described above.

[0008] The purpose of this disclosure is to provide a connector, a handle including such a connector, and an oral care tool that overcomes at least one of the aforementioned disadvantages, specifically an oral care tool including a replaceable brush head that is securely attached to the handle and does not rotate / twist to the side during brushing. Summary of the Invention

[0009] According to one aspect, a connector is provided for repeatedly attaching and removing a head from the handle of a manual oral care tool, the connector having an outer surface and a groove therein forming a cavity within the connector, wherein the cavity includes a spring-loaded ball latching element comprising a ball and a spring that applies a radial force to the ball in a direction toward the outer surface of the connector.

[0010] According to one aspect, a handle for a manual oral care tool is provided, the handle including such a connector.

[0011] According to one aspect, a manual oral care tool is provided, the tool including a head (preferably a brush head) and a handle according to the present disclosure, the head being reusable to and detachable from the handle via a connector according to the present disclosure. Attached Figure Description

[0012] The invention is described in more detail below with reference to various embodiments and accompanying drawings, wherein: Figure 1A perspective view of an exemplary embodiment of a manual oral care tool according to the present disclosure is shown, the oral care tool including a head, a handle, and a connector; Figure 2 It shows Figure 1 A perspective view of the handle with the connector; Figure 3 It shows that according to Figure 2 A schematic side view of the handle with a connector; Figure 4 It shows that according to Figure 2 A schematic front view of the handle with a connector; Figure 5 It shows that according to Figure 2 A schematic top view of the handle with a connector; Figure 6 A front view of an exemplary embodiment of the connector according to this disclosure is shown; Figure 7 It shows Figure 6 Side view of the connector; Figure 8 It shows Figure 2 A longitudinal sectional view of the handle with the connector; Figure 9 A sectional view along line AA is shown; Figure 10 A cross-sectional view along line BB is shown; Figure 11 It shows Figure 1 A schematic perspective view of the head of a manual oral care tool; Figure 12 It shows Figure 11 The bottom view of the head; and Figure 13 Average results for heat transfer and flow distance are shown for several different formulations / material compositions. Detailed Implementation

[0013] The manual oral care tool according to this disclosure includes a handle and a head on which at least one tooth and / or tissue cleaning element (e.g., bristle tufts and / or elastomeric element) is fixed. The head can be repeatedly attached to and detached from the handle. The oral care tool can be a manual toothbrush, or alternatively an inter-proximal pick, plaque scraper, or tissue / tongue cleaner.

[0014] The head of an oral care tool can be attached to the handle via a connector providing a snap-fit ​​locking mechanism to ensure a sufficiently strong connection and stability between the head and the handle, for example, to allow the user to perform brushing motions. The connector has an outer surface and a groove therein forming a cavity within the connector. A spring-loaded ball snap-fit ​​element is disposed within this cavity. The spring-loaded ball snap-fit ​​element includes a ball and a spring that applies a radial force to the ball in a direction toward the outer surface of the connector. Hereinafter, the radial force is defined by a force applied in a direction substantially perpendicular to the longitudinal length extension of the connector. The spring applies force to the ball and pushes the ball outward, causing the ball to extend slightly beyond the outer surface of the connector. The inner wall of a hollow portion within the head may include a groove for receiving the ball of the spring-loaded ball element. Once the head snaps into the connector, the head is axially secured to the handle / connector. In other words, the connector and the oral care tool including such a connector allow the head to be easily attached to and detached from the handle, respectively. The user can attach the brush head to the handle with a simple linear motion. Furthermore, the ball-locking mechanism provides precise hold to the brush head and offers the user clear tactile feedback that the head is securely locked. In other words, the user recognizes this once the ball engages with the groove set in the inner wall of the hollow portion of the head. The brush head can be easily removed without requiring synchronization with other components / unlocking mechanisms.

[0015] The brush head is secured to the handle until a specific / predetermined pull-out force is applied. The connection between the brush head and the connector is strong enough to allow for well-coordinated brushing techniques. The brush head will not detach from the handle or twist to the side during brushing.

[0016] The ball and / or spring of a spring-loaded ball element can be made of stainless steel. While typical snap-fit ​​elements include spring elements made of plastic that exhibit relaxation and aging effects over time, stainless steel springs exhibit constant spring stiffness over time, even under prolonged use conditions (e.g., temperature). A spring-loaded ball element made of stainless steel provides a durable and reliable hold of the head on the connector / shank. Furthermore, if the spring-loaded ball snap-fit ​​element is made entirely of stainless steel, electrical contact from the shank to the replacement can be easily achieved. To provide a closed circuit, a conductive ring at the proximal end of the shank can be attached as a second contact. Electrical contact from the shank to the replacement allows for various additional functions, such as lamps for diagnostic or therapeutic purposes (e.g., for iontophoresis).

[0017] The spring-loaded ball element can be fixed in the cavity by press fitting and / or gluing.

[0018] The connector may include a first substantially cylindrical segment and a second substantially cylindrical segment, wherein the first cylindrical segment and the second cylindrical segment may be connected by at least a partially tapered segment. The first substantially cylindrical segment, the at least partially tapered segment, and the second substantially cylindrical segment may be arranged sequentially in a continuous manner and may define a longitudinal length extension of the connector. The first substantially cylindrical segment and the second substantially cylindrical segment may be positioned off-center relative to the longitudinal length extension of the connector.

[0019] In the following text, the substantially cylindrical section is defined by a three-dimensional body having a longitudinal length extension and a cross-sectional area extending substantially perpendicular to that longitudinal length extension. This cross-sectional area has a substantially constant shape along the longitudinal length extension. Since the connector can be manufactured using an injection molding process, the substantially cylindrical section also includes a section / body with a small draft angle of up to 2°. In other words, the substantially cylindrical section also includes a section / body that tapers slightly by up to 2° towards the proximal end closest to the head once the head is attached to the connector.

[0020] The cross-sectional region can have any shape, such as substantially circular, elliptical, rectangular, semi-circular, circular with a flat portion, convex, or concave. The cross-sectional region can also have a polygonal shape, such as a square or triangle. The portion extending along the length of the cylinder around the outer surface of the cylinder can be defined as consisting of straight lines substantially parallel to the longitudinal length of the cylinder.

[0021] The head of the oral care tool has a distal end and a proximal end, the proximal end being defined as the end closest to the handle. The proximal end of the head may include a hollow portion for receiving a portion of a connector (e.g., a second substantially cylindrical segment, at least a partially tapered segment, and a portion of a first substantially cylindrical segment). The hollow portion of the head may have an inner wall whose geometry / profile corresponds to the outer geometry / profile of the portion of the connector to be inserted into the hollow portion of the head. The off-center arrangement / off-center positioning of the substantially cylindrical segment of the connector allows for precise positioning of the brush head onto the handle. The geometric position of the head is clearly defined. Because the handle includes the connector at the proximal end closest to the head, the off-center / off-center arrangement of the two substantially cylindrical segments can act as a guiding element when the user attaches the head to the handle. In other words, the two substantially cylindrical segments allow for precise mating between the head and the handle. Furthermore, for example, if a lateral force is applied to the head, the eccentric / off-center arrangement of the two essentially cylindrical sections during brushing can provide anti-torsional protection for the head on the handle.

[0022] The first substantially cylindrical segment and the second substantially cylindrical segment have a length extension and a cross-sectional area extending substantially perpendicular to the length extension, and the cross-sectional area of ​​the first substantially cylindrical segment and / or the second substantially cylindrical segment may be substantially circular. This geometry provides a robust and simple structure that is easy to clean after use with oral care tools. Furthermore, due to the relatively simple external geometry, this connector can be manufactured in a cost-effective manner.

[0023] The first substantially cylindrical segment may have a cross-sectional area that is larger than the cross-sectional area of ​​the second substantially cylindrical segment. For example, the first substantially cylindrical segment in the hollow portion at the proximal end of the insertable handle may have a substantially circular cross-sectional area with a diameter of about 8 mm to about 10 mm, preferably about 9 mm, while the second substantially cylindrical segment in the hollow portion at the proximal end of the insertable head may have a substantially circular cross-sectional area with a diameter of about 4 mm to about 6 mm, preferably about 5 mm.

[0024] The first substantially cylindrical segment and the second substantially cylindrical segment may each have a first longitudinal central axis and a second longitudinal central axis, defined as axes of symmetry between the first substantially cylindrical segment and the second substantially cylindrical segment. The first substantially cylindrical segment and the second substantially cylindrical segment may be positioned / arranged relative to each other such that the second longitudinal central axis of the second cylindrical segment is positioned off-center from the first longitudinal central axis of the first cylindrical segment by approximately 1 mm to approximately 2.5 mm, or approximately 1.5 mm to approximately 2 mm, or approximately 1.65 mm. In other words, the center of the second substantially cylindrical segment is offset / eccentrically located from the longitudinal central axis of the first substantially cylindrical segment by approximately 1 mm to approximately 2.5 mm, or approximately 1.5 mm to approximately 2 mm, or approximately 1.65 mm.

[0025] This connector can be easily manufactured, for example, by injection molding, and provides sufficient torsional stability for oral care tools if lateral forces are applied to the brush head.

[0026] The first substantially cylindrical section and / or the second substantially cylindrical section may include a flat portion extending along the length of the first substantially cylindrical section and / or the second substantially cylindrical section. For example, if a lateral force is applied to the head, this flat portion may provide additional anti-torsional protection to the head of the toothbrush connected to the handle during brushing.

[0027] The first substantially cylindrical segment and the second substantially cylindrical segment each have a first outer surface and a second outer surface, and the first substantially cylindrical segment and the second substantially cylindrical segment can be arranged relative to each other such that a portion of the first outer surface and a portion of the second outer surface are substantially linearly aligned. Optionally, a flat portion including a spring-loaded ball element can be arranged opposite to the substantially linearly aligned first and second outer surfaces. This connector has an easy-to-clean external geometry. The connector is robust, easy to use, and can be manufactured in a cost-effective manner.

[0028] The handle of the oral care tool has a distal end and a proximal end, the proximal end being opposite to the distal end and closest to the head when attached to the handle. The proximal end of the handle may include a hollow portion / groove in which a portion of a first substantially cylindrical segment is secured, for example, by a press-fit process and / or gluing. If a connector is formed as part of the handle, the connector (representing a relatively expensive part of the entire oral care tool) can be used for an extended / longer period. Compared to a handle including a connector, a head with a relatively simple structure and relatively low cost can be replaced every three months. New head replacements can be purchased at a relatively low cost. Although replaceable brush heads according to the prior art consist of components of multiple parts or include at least one additional insert, frequently replaceable brush heads for oral care tools according to this disclosure can be produced at a lower cost.

[0029] The proximal end of the handle may have a beveled surface. This beveled surface provides additional torsional protection for the oral care tool during use. The beveled surface and cross-sectional area of ​​the handle may define an angle α of about 15° to about 30°, or about 18° to about 28°, or about 25°. The cross-sectional area is defined by a region extending substantially perpendicular to the longitudinal length extension of the handle. Surprisingly, this angled / beveled surface has been found to provide excellent torsional protection. Furthermore, the angled / beveled surface allows fluids such as toothpaste slurry and saliva to drain after use of the oral care tool, thus preventing such fluids from accumulating over time.

[0030] The connector and the oral care tool incorporating such a connector allow for easy attachment and removal of the head from the handle, respectively. The user attaches the head to the handle with a simple linear motion. Utilizing a specific design of a substantially cylindrical segment arranged off-center and a beveled surface of the handle, the head automatically rotates to the correct orientation (within tolerances) during the attachment motion. Therefore, the consumer is not forced to precisely position the head on the handle before it snaps onto it. Furthermore, the ball-and-socket design provides precise retention of the brush head and offers the consumer clear tactile feedback that the head is securely locked. The brush head can be easily removed without any synchronized action with other components (unlocking mechanisms). Additionally, the connector is easy to clean. This specific design of the connector eliminates any grooves that could accumulate dirt, toothpaste, and / or saliva. The connector also avoids any fragile structures by including only substantially rounded edges, preventing easy breakage or damage to the surface.

[0031] To allow for a sufficiently good fit of the brush head on the connector in the event of manufacturing tolerances, the inner wall of the hollow portion of the head may include at least one slit or two slits arranged opposite to each other to precisely adjust the head on the connector / handle. Furthermore, the at least one slit prevents air compression within the hollow portion of the head, which could act as a spring or provide additional resistance when the head is snapped onto the connector / handle.

[0032] At least a portion of the head (e.g., the neck / axis and bristle carrier) may be at least partially composed of a density of about 0.5 g / cm³. 3 Approximately 1.2 g / cm³ 3 or approximately 0.7 g / cm³ 3 To approximately 1.0 g / cm³ 3 or approximately 0.9 g / cm³ 3 The head can be made of materials such as thermoplastic polymers (e.g., those with a density of about 0.9 g / cm³). 3 The stem is injection molded from polypropylene. In contrast to the head, the stem may be at least partially made of a material with a significantly higher density (i.e., a density of approximately 2.1 g / cm³). 3 Approximately 3.1 g / cm³ 3 or approximately 2.3 g / cm³ 3 Approximately 2.8 g / cm³ 3 or approximately 2.5 g / cm³ 3 Approximately 2.7 g / cm³ 3 Made of materials.

[0033] The handle material can be relatively heavy to provide users with a high-quality perception and comfortable feel during the use of the oral care tool. Users typically prefer products (especially in the personal care field) with a certain weight to ensure high quality and provide comfort during use. Therefore, this oral care tool offers this superior perception of product quality.

[0034] Furthermore, because the handle material can have a higher density than the head material, the center of gravity / weight is located within the handle (even when the brush head is loaded with toothpaste). This allows the user to perform well-coordinated brushing techniques and has an improved sensory experience during brushing. The center of gravity, located in the center of the handle, provides an oral care tool with better balance and prevents it from tipping over / loading the head once toothpaste is applied. The oral care tool according to this disclosure has the advantage of having its center of gravity at or very close to the wrist joint pivot point when the user applies different grips / brushing techniques. A balanced toothbrush is easier to control in the mouth, allowing for more precise and accurate brushing movements, which results in better cleaning.

[0035] Compared to a regular manual toothbrush that is discarded after about three months of use, while the high quality and relatively expensive handle of an oral care tool are suitable for use over a longer period, the brush head can be replaced periodically, for example, after about three months, with a relatively inexpensive replacement brush. This provides a cost-effective and environmentally sustainable high-quality oral care tool with improved disposal characteristics.

[0036] In the past, it has been observed that users typically store damp brushes in toothbrush cups to dry after brushing. However, in typical toothbrush cups, the expelled fluid is collected and accumulates at the bottom of the cup, and the fluid remains in contact with the toothbrush for an extended period. Because the cup is only open on one side, the toothbrush dries relatively slowly. Bacteria living in damp conditions / environments can grow rapidly, contaminating the toothbrush and ultimately making it unhygienic. Therefore, a solution is needed for the hygienic storage and drying of manual toothbrushes, allowing residual water, toothpaste slurry, and saliva to drain from the brush. The brush should dry quickly to inhibit bacterial growth.

[0037] The head material can be made of non-magnetic or non-ferromagnetic material, while the handle material can be made of magnetic and / or ferromagnetic material. Magnetic / ferromagnetic materials not only have a relatively high density but also a relatively heavy weight, which provides the aforementioned benefits for oral care tools, but also allow the oral care tool to be magnetically attached to a magnetic retainer. The magnetic / ferromagnetic material of the handle allows for hygienic storage of the oral care tool. If the oral care tool is magnetically attached to a magnetic retainer, residual water, toothpaste paste, and saliva can be expelled from the brush. The oral care tool can dry relatively quickly. Therefore, bacterial growth is significantly reduced, making the oral care tool more hygienic. Compared to a regular toothbrush stored in a toothbrush cup, where the expelled fluid is collected and accumulates at the bottom of the cup, the brush according to this disclosure is exposed to moist conditions for a significantly shorter period.

[0038] For example, a magnetic retainer can take the form of a flat disc that can be attached to a wall. This flat disc represents an easy-to-clean surface. Furthermore, the user simply needs to bring the oral care tool close to the magnetic retainer, and the tool automatically attaches. Precise positioning or threading is not required as in a regular toothbrush retainer. Because magnetism is provided only in the handle, not the head, the head portion cannot accidentally attach to the magnetic retainer, thus reducing the risk of the retainer getting dirty.

[0039] The magnetic and / or ferromagnetic material forming at least a portion of the handle may comprise an amorphous thermoplastic resin. The magnetic and / or ferromagnetic material may also comprise alumina, boron nitride, or aluminum silicate. Furthermore, the magnetic and / or ferromagnetic material may additionally or alternatively comprise iron oxide. The magnetic and / or ferromagnetic material may also comprise glass fiber that can be premixed with at least a portion of the amorphous thermoplastic resin. This handle material allows for control of the handle's weight at any location, for example, through variations in filler. Due to the relatively high weight of the handle, control of the entire toothbrush is necessary. It is now possible to use the mass / weight distribution of the material to accommodate the inertial torque of the finished toothbrush.

[0040] The magnetic and / or ferromagnetic material may comprise about 13% to about 30% by weight of an amorphous thermoplastic resin; about 3% to about 25% by weight of alumina, boron nitride, or aluminum silicate; and about 45% to about 67% by weight of iron oxide. This composition provides a material density approximately three times that of standard plastic materials used in toothbrushes, such as polypropylene. This material, particularly when combined with an electroplated coating, drives perceived value due to its higher weight and higher thermal conductivity. Such a coating may be made from a real metal. The electroplated coating may be applied in a selective electroplating process. During this coating process for multi-component plastic parts, the metal layer is deposited only on the rigid material, while the additional overmolded soft components remain unaffected.

[0041] Magnetic and / or ferromagnetic materials may contain about 27.5% by weight of amorphous thermoplastic resin, about 17% by weight of alumina, about 51% by weight of iron oxide and about 4.5% by weight of glass fiber.

[0042] Amorphous thermoplastic resins may include styrene resins, such as styrene-acrylonitrile "SAN". Amorphous thermoplastic resins may be selected from acrylonitrile-butadiene-styrene, polystyrene, and styrene-acrylonitrile.

[0043] The amorphous thermoplastic resin may contain about 17% by weight of styrene-acrylonitrile and 10.5% by weight of a mixture comprising polybutylene terephthalate and polyethylene terephthalate.

[0044] Surprisingly, the composition has been found to provide a high-density molding material suitable for injection molding or extrusion. It provides a high-density molding material with high surface hardness, excellent coating properties, and excellent thermal conductivity.

[0045] The use of molding materials with relatively high specific gravity is known. Such molding materials typically contain polymer resins and high-density fillers such as iron oxide. However, the amount of iron oxide that can be included in such molding materials is limited due to their relatively poor thermal conductivity. Therefore, on the one hand, the lower thermal conductivity results in relatively long cycle times during manufacturing to allow the molding material to cool after molding. On the other hand, if the heavy polymer material is filled with highly thermally conductive additives, such as metal powders or fibers, the addition of these materials results in a tight process window in the molding process because the molten material solidifies immediately upon contact with the cold wall of the tool. This rapid solidification leads to high injection speeds and a low flow length to wall thickness ratio at the produced part.

[0046] It has now been surprisingly discovered that the molding materials according to this disclosure possess high specific gravity and optimally controlled thermal conductivity, thereby reducing or extending the time required for cooling of the molding material during or after injection molding. Surprisingly, it has been found that a relatively high percentage of iron oxide can be maintained in the molding material while simultaneously improving its thermal conductivity. The addition of alumina, boron nitride, or aluminum silicate provides improved thermal conductivity to the molding material compared to materials containing only styrene resin and iron oxide. This improved thermal conductivity results in lower cycle times because the molding material requires less time to cool after molding.

[0047] Another benefit of adding alumina, boron nitride, or aluminum silicate to materials is that it increases the total amount of iron oxide in the molding material compared to materials containing iron oxide and resin in the past. The improved properties of the molding material result from the addition of relatively small amounts of alumina, boron nitride, or aluminum silicate. Material compositions containing a relatively high percentage (i.e., from about 45% to about 67% by weight, preferably about 51% by weight) of iron oxide (magnetite) provide good magnetic properties and a relatively heavy total material weight.

[0048] Styrene-acrylonitrile (SAN) offers high heat resistance. The acrylonitrile units in the chain give SAN a glass transition temperature greater than 100°C. The properties of SAN allow for reduced cycle times due to its relatively early and faster transition temperature. Amorphous polymers are suitable for the heavy resin composites of this disclosure because amorphous polymers reversibly transition from a viscous or rubbery state to a hard state at a glass transition temperature (Tg). Through injection molding of the heavy resin materials of this disclosure, the temperature of the melt is above the Tg region (viscous or rubbery state). During cooling, the composite reaches a high Tg temperature early and achieves dimensional stability (glassy state). Due to the high Tg of the material, the material maintains dimensional stability, thus enabling overmolding of the heavy resin materials.

[0049] Polybutylene terephthalate (PBT) and / or polyethylene terephthalate (PET) provide high-quality surface properties for the handle, including improved optical properties and high impact strength. Upon heating, the mixture of PBT and PET represents a high-temperature melt with low viscosity and a high melt flow index (MFI). Therefore, the processability of the magnetic / ferromagnetic material is improved during molding.

[0050] It is well known that heavy resin materials tend to exhibit high shrinkage effects for products with thick walls / sizes. However, it has been surprisingly found that glass fibers added to magnetic / ferromagnetic materials provide improved stability and low shrinkage effects to the material composition.

[0051] The material disclosed herein is an alternative to metal / zinc die-casting materials. The material disclosed herein offers an attractive solution relative to the manufacturing methods, prices, and environment according to the disclosure. This alternative allows the handle to have the appearance and feel of a metal product in its final state. Simultaneously, the material disclosed herein should be easily processable by injection molding and should save assembly work. For example, the method of the disclosure requires three basic steps: (1) injection molding of the handle 12; (2) two-component injection molding of a hard material and / or a soft material, for example, to form a thumb rest 16; and (3) electroplating of the handle, for example, to form a metal layer in the form of a ring 18. In contrast, when using zinc die-casting materials, five steps are required: (1) manufacturing of the zinc die-casting master component; (2) deburring of the master component; (3) electroplating of the master component; (4) separate production of the soft material component; and (5) assembling the master component with the separately produced soft material component. Lubricants may also be added to the material to improve the flowability of the molding process.

[0052] Table 1 shows the flowability and heat transfer results for several different formulations / material compositions.

[0053] Table 1: Flowability and Heat Transfer It can be seen that different fillers and different filler concentrations control the thermal conductivity or heat transfer and flowability of the material.

[0054] Test results show that using boron nitride or aluminum silicate exhibits the same characteristics as in Table 1 above. Figure 13 The results for alumina shown are very similar.

[0055] Thermal and shear heating affect the flowability of heavy resin materials, thereby allowing precise control of the process window for effective injection molding. Furthermore, since the materials disclosed herein can fill any available cavity within the mold, it is possible to use the mass / weight distribution of the material to accommodate the inertial moment of the finished product.

[0056] Several advantages exist related to the materials of this disclosure: handles manufactured using the materials of this disclosure have the appearance and feel of heavy metal handles and are corrosion resistant. Compared to metal inserts or die-cast handles and products with assembled components, this material also offers manufacturing and cost savings due to its heat transfer properties, and has a fast cycle time. Compared to zinc die-cast products, the materials of this disclosure require less energy and other necessary resources for manufacturing.

[0057] Compared to material compositions with highly loaded fillers, the magnetic / ferromagnetic materials of this disclosure exhibit optimized mechanical properties due to improved melt viscosity and glass transition temperature, particularly dimensional stability under thermal and shock strength.

[0058] The materials disclosed herein have the ability to adhere to other components / materials (e.g., substrates and resins), which is important for multi-component injection molding, such as for molding shanks comprising two or three different materials.

[0059] The handle or part of the handle can be electroplated to enhance the appearance and feel. Thermoplastic elastomers are well-suited for electroplating because they allow for the selective production of hard and soft composite components to be electroplated in a single operation.

[0060] For example, the handle may include a thumb rest made of a thermoplastic elastomer material and / or polypropylene material. These materials can be readily injection molded onto heavy resin materials as discussed above. This thumb rest can provide improved handling characteristics to the handle of the oral care tool, such as providing anti-slip properties to improve the maneuverability of the oral care tool under wet conditions, such as when the user is brushing their teeth. The thumb rest may be made of a thermoplastic elastomer having a Shore A hardness of about 30 to about 60, or about 40, to prevent the oral care tool from becoming too slippery when used under wet conditions. At least a portion of the thumb rest may have a concave shape with an angle α of about 20° to about 25° or about 24° relative to the rest of the thumb rest. The thumb rest or gripping area may be attached to the front surface of the handle in the area near the proximal end (i.e., closest to the head). The thumb rest may include multiple ribs extending substantially perpendicular to the longitudinal axis of the oral care tool. These ribs allow the user / consumer to use the oral care tool with even greater control. Users / consumers can better grip and manipulate the handle of oral care tools while brushing their teeth. This handle provides further improved control and greater comfort during brushing, especially in wet conditions.

[0061] Furthermore, the handle may be made of at least two or at least three different materials, each forming a different part of the handle. For example, a first material according to this disclosure, such as a magnetic and / or ferromagnetic material, may be injection molded into a first component of the handle, thereby forming the basic base structure of the oral care tool. A second component, such as a polypropylene material, may be injection molded over the first component, and / or a third component, such as a thermoplastic elastomer material, may be injection molded over the first component and / or the second component.

[0062] The third component, made of thermoplastic elastomer material, can form a thumb rest on the front surface of the oral care tool and / or a palm grip on the rear surface opposite the front surface, for the user / consumer's fingers and thumb to grip. This handle configuration can further resist slippage during use. The thermoplastic elastomer material can extend through holes provided in the second component of the underlying base structure and / or the handle.

[0063] Dental cleaning elements of oral care tools, such as bundles of filaments forming one or more clusters, can be attached to a head via a thermal tufting process. A method of manufacturing a head having a filament cluster embedded in the head may include the following steps: In a first step, forming a cluster by providing a desired amount of filaments. In a second step, placing the cluster in a mold cavity such that the ends of the filaments to be attached to the head extend into the cavity. The opposite ends of the filaments not extending into the cavity may be end-rounded or not end-rounded. For example, in the case where the filaments are tapered filaments with sharp tips, the filaments may be not end-rounded. In a third step, the head is formed around the ends of the filaments extending into the mold cavity by an injection molding process, thereby anchoring the cluster in the head. Alternatively, the cluster may be anchored by forming a first portion of the head (a so-called "sealing plate") around the ends of the filaments extending into the mold cavity using an injection molding process prior to forming the rest of the oral care tool. Before initiating the injection molding process, the ends of the clusters extending into the mold cavity can optionally be melted or fused together to join the filaments together in the melt or molten ball, such that the melt or molten ball is located within the cavity. The clusters can be held in the mold cavity by a molding bar with blind holes corresponding to the desired location of the clusters on the finished head of the oral care tool. In other words, clusters attached to the head by the thermal tufting process do not overlap along their middle portion and are installed in the head without the use of anchors / pins. A tufting process without anchors can be used to attach the clusters to the head.

[0064] Alternatively, the head of the oral care tool may be provided with a bristle carrier having at least one tufting hole (e.g., a blind-end hole). A tuft comprising multiple filaments can be secured / anchored in the tufting hole by a binding process / anchoring tufting method. This means that the filaments of the tuft are bent / folded in a substantially U-shape around an anchor, for example, made of metal, such as an anchor cable or anchor plate. The filaments are pushed into the tufting hole together with the anchor, such that the anchor penetrates into the opposite sidewall of the tufting hole, thereby anchoring / secured / fastening the filaments to the bristle carrier. The anchor can be secured in the opposite sidewall by positive friction engagement. In the case of a blind-end hole, the anchor holds the filament against the bottom of the hole. In other words, the anchor can be positioned substantially vertically above the U-shaped bend. Because the filaments of the tuft are bent in a substantially U-shaped configuration around the anchor, the first and second branches of each filament extend from the bristle carrier along the filament direction. The type of filament that can be used / suited for use in binding processes is also known as "double-sided filament". Heads for oral care tools manufactured using binding processes can be provided in a relatively low-cost and time-efficient manner.

[0065] The following is a non-limiting discussion of exemplary embodiments of oral care tools and components thereof according to the present disclosure, with reference to the accompanying drawings.

[0066] Figure 1 A manual oral care tool 10 is shown, in this specific embodiment being a manual toothbrush 10. The manual toothbrush 10 includes a handle 12 with a connector 14 attached and a brush head 16. The brush head 16 can be repeatedly attached to and detached from the handle 12 via the connector 14.

[0067] Figures 2 to 5 Schematic perspective, side, front, and top views of a handle 12, including a connector 14, are shown. The connector 14 includes a first substantially cylindrical segment 18, a second substantially cylindrical segment 20, and at least partially tapered segment 22 connecting the first cylindrical segment 18 and the second cylindrical segment 20. The first substantially cylindrical segment 18, the at least partially tapered segment 22, and the second substantially cylindrical segment 20 are arranged in a continuous sequence and together define a longitudinal length extension 24 of the connector 14. The first substantially cylindrical segment 18 and the second substantially cylindrical segment 20 are positioned off-center relative to the longitudinal length extension 24 of the connector 14. Figure 7 From the side view, it can be seen that the first substantially cylindrical segment 18 and the second substantially cylindrical segment 20 each have a first longitudinal central axis 74 and a second longitudinal central axis 76, which are defined as axes of symmetry of the first substantially cylindrical segment 18 and the second substantially cylindrical segment 20, respectively. The first substantially cylindrical segment 18 and the second substantially cylindrical segment 20 can be placed / arranged relative to each other such that the second longitudinal central axis 76 of the second cylindrical segment 20 is positioned at a distance 78 from the center relative to the first longitudinal central axis 74 of the first cylindrical segment 18, approximately 1 mm to approximately 2.5 mm, or approximately 1.5 mm to approximately 2 mm, or approximately 1.65 mm. In other words, when viewed in the side view (see...), Figure 3 , Figure 7 and Figure 8 When observed in the image, the central axis 76 of the second substantially cylindrical section 20 is offset / eccentrically located from the longitudinal central axis 74 of the first substantially cylindrical section 18 by a distance 78 of approximately 1 mm to approximately 2.5 mm, or approximately 1.5 mm to approximately 2 mm, or approximately 1.65 mm.

[0068] The handle 12 has a distal end 54 and a proximal end 56, the proximal end 56 being closest to the brush head 16 that can be attached to the handle 12. Figures 8 to 10 As shown, the proximal end 56 of the handle 12 includes a hollow portion / groove 58 in which a portion of the first substantially cylindrical section 18 is fixed, for example, by a press-fit process and / or gluing.

[0069] The proximal end 56 of the handle 12 includes a chamfered surface 60. The cross-sectional region 62 extending substantially perpendicular to the longitudinal length extension 64 and the chamfered surface 60 define an angle α of about 15° to about 30°, or about 18° to about 28°, or about 25°.

[0070] Figure 6 and Figure 7 Schematic front and side views of connector 14 are shown. A first substantially cylindrical segment 18 and a second substantially cylindrical segment 20 each have length extensions 26 and 28 and cross-sectional regions 30 and 32 extending substantially perpendicular to the length extensions 26 and 28, respectively. The cross-sectional region 30 of the first substantially cylindrical segment 18 and the second cross-sectional region 32 of the second substantially cylindrical segment 20 are substantially circular. The cross-sectional region 30 of the first substantially cylindrical segment 18 is larger than the cross-sectional region 32 of the second substantially cylindrical segment 20. The first cross-sectional region 30 has a diameter 36 of about 8 mm to about 10 mm, or about 9 mm, while the second cross-sectional region 32 has a diameter 34 of about 4 mm to about 6 mm, or about 5 mm.

[0071] The first substantially cylindrical section 18 includes a flat portion 38 at the outer surface 80 of the connector 14. The flat portion 38 extends along a length extension 26 of the first substantially cylindrical section 18. (As can be seen from...) Figures 8 to 10 Further, the flat portion includes a groove 40 that forms an inner cavity 82 within the connector 14. A spring-loaded ball element 42 is inserted into the cavity 82 and secured therein, for example, by a press-fit process and / or gluing. The spring-loaded ball element 42 is an element with a snap-fit ​​locking mechanism to provide sufficiently strong connection and stability between the head 16 and the handle 12 in the axial direction (i.e., along the longitudinal length extension 24 of the connector and the oral care tool 10). The spring-loaded ball element 42 includes a ball 44 and a spring 46, the spring 46 applying a radial force to the ball 44 toward the outer circumference 48 and outer surface 80 of the connector 14. When the brush head 16 is attached to the handle, the ball 44 extends slightly beyond the outer surface of the first substantially cylindrical section 18 and rests in a corresponding groove 70 provided in the hollow portion (66) of the head shaft (see...). Figure 11 and Figure 12 Both spring 46 and ball 44 can be made of stainless steel.

[0072] The first substantially cylindrical segment 18 and the second substantially cylindrical segment 20 each have a first outer surface 50 and a second outer surface 52, and the first substantially cylindrical segment 18 and the second substantially cylindrical segment 20 are arranged relative to each other such that a portion of the first outer surface 50 and a portion of the second outer surface 52 are substantially linearly aligned. The flat portion 38 is arranged opposite to the substantially linearly aligned first outer surface 50 and second outer surface 52.

[0073] Figure 11 A perspective view of brush head 16 is shown, and Figure 12 A corresponding bottom view is shown. The head 16 includes a hollow portion 66 for receiving a second generally cylindrical segment 20, at least a partially tapered segment 22, and a portion of a first generally cylindrical segment 18 of the connector 14. The hollow portion 66 has an inner wall 68 that includes a groove 70 for receiving a portion of a ball 44 of a spring-loaded ball element 42. The inner wall 68 of the hollow portion 66 also includes two oppositely arranged slits 72 for precisely adjusting the head 16 on the connector 14. Figure 13 Average results for heat transfer and flow distance are shown for several different formulations / material compositions.

[0074] In the context of this disclosure, the term "substantially" refers to an arrangement of elements or features that, while theoretically expected to exhibit precise consistency or behavior, may in practice make something appear somewhat imprecise. Similarly, the term represents the degree to which quantitative values, measurements, or other relevant representations may differ from the reference without causing a change in the fundamental function of the subject matter.

[0075] The dimensions and values ​​disclosed herein should not be construed as strictly limited to the precise numerical values ​​cited. Rather, unless otherwise specified, each such dimension is intended to represent the stated value and a range around which it is functionally equivalent. For example, a dimension disclosed as “40 mm” is intended to represent “approximately 40 mm”.

Claims

1. A connector (14) for repeatedly attaching (16) to and detaching from a handle (12) of a manual oral care tool (10), the connector (14) having an outer surface (80) and a recess (40) therein, the recess (40) forming a cavity (82) within the connector (14), wherein the cavity (82) includes a spring-loaded ball latching element (42), the element (42) including a ball (44) and a spring (46) applying a radial force to the ball (44) in a direction toward the outer surface (80) of the connector (14).

2. The connector (14) according to claim 1, characterized in that, The connector (14) includes at least a first substantially cylindrical segment (18) and a second substantially cylindrical segment (20), at least a partially tapered segment (22) connecting the first substantially cylindrical segment (18) and the second substantially cylindrical segment (20), the first substantially cylindrical segment (18), the second substantially cylindrical segment (20) and the at least partially tapered segment (22) defining a longitudinal length extension (24) of the connector (14), wherein the first substantially cylindrical segment (18) and the second substantially cylindrical segment (20) are positioned off-center relative to the longitudinal length extension (24).

3. The connector (14) according to claim 2, characterized in that, The first substantially cylindrical segment (18) and the second substantially cylindrical segment (20) each have a length extension (26, 28) and a cross-sectional region (30, 32) extending substantially perpendicular to the length extension (26, 28), and the cross-sectional region (30) of the first substantially cylindrical segment (18) and / or the cross-sectional region (32) of the second substantially cylindrical segment (20) are substantially circular.

4. The connector (14) according to any one of claims 2 and 3, characterized in that, The first substantially cylindrical section (18) and / or the second substantially cylindrical section (20) include a flat portion (38).

5. The connector (14) according to claim 4, characterized in that, The recess having the spring-loaded ball latching element (42) is provided at the flat portion (38).

6. The connector (14) according to any one of claims 2 to 5, characterized in that, The first substantially cylindrical segment (18) has a larger cross-sectional area (30) than the cross-sectional area (32) of the second substantially cylindrical segment (20).

7. The connector (14) according to any one of claims 2 to 6, characterized in that, The first substantially cylindrical segment (18) and the second substantially cylindrical segment (20) each have a first outer surface (50) and a second outer surface (52), and the first substantially cylindrical segment (18) and the second substantially cylindrical segment (20) are arranged relative to each other such that a portion of the first outer surface (50) and a portion of the second outer surface (52) are substantially aligned in a straight line.

8. The connector (14) according to any one of claims 4 to 7, characterized in that, The flat portion (38) is arranged opposite to the first outer surface (50) and the second outer surface (52) which are basically aligned in a straight line.

9. A handle (12) for a manual oral care tool (10), said handle (12) comprising a connector (14) according to any of the preceding claims.

10. The handle (12) according to claim 9, characterized in that, The handle (12) has a distal end (54) and a proximal end (56), the proximal end (56) being closest to the head (16) that can be attached to the handle (12), the proximal end (56) of the handle (12) including a hollow portion (58), a portion of a first substantially cylindrical segment (18) being inserted into the hollow portion.

11. The handle (12) according to claim 10, characterized in that, The proximal end (56) includes a chamfered surface (60), and preferably the handle (12) has a longitudinal length extension (64) and a cross-sectional region (62) extending substantially perpendicular to the longitudinal length extension (64), and the chamfered surface (60) and the cross-sectional region (62) define an angle α of about 15° to about 30°, preferably about 18° to about 28°, and more preferably about 25°.

12. A manual oral care tool (10), comprising: The head (16), preferably a brush head (16); and a handle (12) according to any one of claims 9 to 11, the handle (12) having a connector (14) via which the head (16) can be repeatedly attached to and detached from the handle (12).

13. The manual oral care tool (10) according to claim 12, characterized in that, The head (16) includes a hollow portion (66) for receiving a portion of a first substantially cylindrical segment (18), at least a partially conical segment (22), and a second substantially cylindrical segment (20).

14. The manual oral care tool (10) according to claim 13, characterized in that, The hollow portion (66) of the head (16) includes an inner wall (68) that includes a recess (70) for receiving a ball (44) of the spring-loaded ball latching element (42).

15. The manual oral care tool (10) according to claim 14, characterized in that, The inner wall (68) of the hollow portion (66) of the head (16) also includes at least one slit (72) for adjusting the head (16) on the connector (14), preferably two slits (72) arranged opposite to each other.

Images