Toothbrush having a uniform, smooth and continuous wall of bristles
A toothbrush, either manual or powered, including an elongated member with a head at one end and a handle at the other end. The toothbrush is generally aligned along a central longitudinal axis. The head having a brush face including a brush cavity from which a plurality of bristles extend. The bristles being arranged in a plurality of bristle tufts so as to extend generally perpendicular to the central longitudinal axis. The toothbrush also includes a plurality of lateral support members extending upwardly from a base of the brush cavity. The bristles are attached to the toothbrush by an attachment device provided in the brush cavity. The attachment device engages at least one of the tufts and secures the tuft between adjacent lateral support members. The attachment device includes a bottom edge and a top edge. Each of the lateral support members extend to a predetermined height from the base of the brush cavity so as to reach at least the height of the bottom edge of said attachment device in the brush cavity.
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1. Field of the Invention
This invention relates to a toothbrush with bristles attached in such a manner to create a uniform, smooth and continuous wall thereof, and more particularly, to a toothbrush with means for supporting the toothbrush bristles to achieve a uniform, smooth and continuous wall of bristles using conventional staple bristle attachment methods.
2. Discussion of Related Art
Truly continuous smooth bristle bars are not new in the art (see, for example, U.S. Pat. No. 6,276,021), but have only been achieved using new staple-less manufacturing technologies. These new manufacturing techniques, such as IMT, Fusion and AFT, are somewhat complex resulting in high capital cost and long lead times. It has therefore been found desirable to create continuous smooth bristle bars by utilizing conventional staple technology due to its lower overall cost.
Attempts have been made in the past with limited success to achieve smooth bristle bars utilizing conventional staple technology. For instance, simulated bristle bars have been achieved in the past using individual square tuft holders placed very close to one another, to minimize the space between tufts. Examples of this manufacturing technique are described in U.S. Pat. No. 5,446,940, owned by the same assignee as this application. A similar technique is described in U.S. Patent Publication No. 2001/0023516, with a “transverse wall” located between each tuft.
A disadvantage of the above-noted prior art of U.S. Pat. No. 5,446,940 is the small “bridge” of plastic required between each tuft. This “bridge” runs flush with the top surface of the brush face, and causes a small gap A (see
The “transverse wall” of the manufacturing technique in U.S. Patent Publication No. 2001/0023516 is needed to maintain the bristles in a near upright position, so that subsequent tufts can be inserted without obstructing their access to their respective tuft hole. As is shown in
U.S. Patent Publication No. 2001/023516 further describes a method of using extra parts in the brush construction to create the “transverse walls”, suggesting the use of metal staples or metal bars. It has therefore been found desirable to provide a toothbrush which utilizes a single molded part for the construction of the tuft slot hole. Such a construction results in a stronger assembly, which is faster and less costly to produce.
Based upon the foregoing, it has been found desirable to provide a toothbrush having a uniform, smooth and continuous wall of bristles, which uses traditional low cost staple techniques and ensures that once inserted, the bristles remain in a substantially upright vertical orientation with respect to the longitudinal axis of the toothbrush to enable timely insertion of further bristles.
OBJECTS OF THE INVENTIONIt is therefore an object of the present invention to provide a toothbrush which overcomes the disadvantages of the aforementioned prior art.
It is also an object of the present invention to provide a toothbrush which is manufactured so as to achieve a uniform, smooth and continuous wall of bristles using traditional staple technology.
It is another object of the present invention to provide a method for making a toothbrush with a uniform, smooth and continuous wall of bristles which has lower production costs.
It is yet another object of this invention to provide a toothbrush which has adequate lateral support for the bristles tufted into the bristle cavity.
It is a further object of the present invention to provide a toothbrush having a uniform, smooth and continuous wall of bristles, uses traditional low cost staple techniques, and ensures that once inserted, the bristles remain substantially vertical with respect to the toothbrush to enable insertion of further bristles.
It is an additional object of this invention to create a uniform bristle bar for bristles in a toothbrush which minimizes gaps as the bristles leave the brush face.
It is yet another object of this invention to provide a toothbrush which utilizes a single molded part for the construction of the tuft slot hole.
Various other objects, advantages and features of the present invention will become readily apparent from the ensuing detailed description and the novel features will be particularly pointed out in the appended claims.
SUMMARY OF THE INVENTIONIn accordance with the present invention, a toothbrush having a uniform, smooth and continuous wall of bristles is provided. The toothbrush of the present invention has a handle portion at one end thereof and a head portion at the other end thereof. The head portion includes a brush face and a brush cavity with a plurality of lateral support members extending upwardly from the brush cavity so as to provide lateral support for the plurality of upwardly extending bristles arranged in a plurality of tufts. In applicant's toothbrush, at least one staple engages at least one of the plurality of tufts and affixes the at least one of the plurality of tufts between at least two of the lateral support members. In order to prevent gaps between the bristles as they exit the bristle cavity, a leg of the lateral support member extends from a base of the cavity in the direction of the brush face to at least a bottom edge of the staple. This arrangement of the tufts in the lateral support member engaged by a staple enables the bristle of the tufts to engage one another at a point in the cavity below the brush face. As a result, the plurality of tufts so joined form a substantially uniform continuous layer of bristles extending from the brush face.
In accordance with another embodiment of the present invention, a toothbrush is provided having an elongated member having a head at one end and a handle at the other end, generally aligned along a central longitudinal axis, said head having a brush face including a cavity from which a plurality of bristles extend, said plurality of bristles being arranged in a plurality of tufts so as to extend generally perpendicular to the central longitudinal axis;
- a plurality of lateral support members extending upwardly from a base of the brush cavity; attachment means provided in said brush cavity for engaging at least one of the plurality of tufts and for securing said one tuft between adjacent lateral support members, the attachment means having a bottom edge and a top edge; and wherein each of said lateral support members extends from the base of the cavity so as to reach a predetermined height in the cavity which is between the height of the bottom edge of the attachment means and the brush face.
In accordance with a further embodiment of the present invention, a powered toothbrush is provided having an elongated member having a head at one end and a handle at the other end, generally aligned along a central longitudinal axis, said head having a brush face including a cavity from which a plurality of bristles extend, said plurality of bristles being arranged in a plurality of tufts so as to extend generally perpendicular to the central longitudinal axis; a plurality of lateral support members extending upwardly from a base of the brush cavity; attachment means provided in said cavity at least for engaging one of the plurality of tufts and for securing said one tuft between adjacent lateral support members, said attachment means having a bottom edge and a top edge, and wherein each of the lateral support members extends to a predetermined height from the base of the brush cavity so as to reach at least the height of the bottom edge of said attachment means in said brush cavity.
In accordance with still another embodiment of the present invention, a lateral support member for holding bristles in a toothbrush is provided having a substantially U-shaped formation formed in a cavity of the toothbrush, at least one leg of the U-shaped formation extending to a point between a bottom edge of a staple securing the bristles to the toothbrush and the brush face.
The tuft in accordance with the present invention may be engaged by arranging the staple between a single lateral support member and a side edge of the cavity. Moreover, the lateral support members may extend to a point between the brush face and the bottom edge of the staple.
Given the outward forces created by the presence of a staple, it is preferred to have the height of the lateral support wall rise above the bottom of the staple. However, to ensure that the bristles between adjacent tufts are in full contact (with no gaps) prior to leaving the tuft hole, the lateral support wall should stop short of the top surface of the brush face. The final convergence point of these bristles is controlled by the top-most width of the lateral support wall, the distance between the top of the wall and the brush face, and angle of the sides of the wall.
BRIEF DESCRIPTION OF THE DRAWINGSThe following detailed description, given by way of example, but not intended to limit the invention solely to the specific embodiments described, may best be understood in conjunction with the accompanying drawings in which:
Referring now to the drawings, wherein like reference numerals represent like features in the several views, the preferred embodiments of a toothbrush in accordance with the teachings of the present invention are shown in
Referring now to
The head 10 also includes a brush face 16, which forms the top most surface of the head 10. Typically, the bristles 18 extend substantially perpendicular to the longitudinal axis 3 of the toothbrush 1 from the bottom 34 of the cavity 12 to a point above the brush face 16, as shown in
In a preferred embodiment of
The bottom edge 28 of the retaining staple 22 forms the center of the bend radius of the bristles 18 as shown in
The final convergence point of the bristles 18 is controlled by the top-most width of the lateral support member 14, and more specifically the width of the legs 23 and 25, the distance between the top of the lateral support member 14 and the brush face 16, and the angle θ of the legs 23 or 25 of the lateral support member 14 with respect to the bottom 34.
As shown in
As shown in
Another aspect of the present invention is shown in
While the foregoing examples have been discussed with respect to lateral support members having a substantially straight formation and disposed substantially longitudinally on the axis 3, other orientations are considered within the scope of the present invention. For example,
It should be understood that the objective reached above can also be achieved by a construction involving an increase in the thickness of the head 10 perpendicular to the longitudinal axis 3 of the toothbrush 1. This results in an increase in the depth of the cavity 12, which in turn provides for an increase in the height of the edge 26 around the cavity 12. This increase in height effectively insures that the point of convergence of the bristles remains below the brush face, thus eliminating the gap A that is produced when using the methods shown in prior art of
However, while this method is contemplated, in the preferred embodiment the thickness of the head 10 is not increased as this presents a more desirable toothbrush, requiring less material and resulting in a more compact toothbrush for easier use.
The preferred materials for construction of the toothbrush 1 of the present invention include a wide variety of moldable or injectable plastics such as thermoplastics. It is preferable that the toothbrush and head are molded as a single thermoplastic component. Alternatively, multiple plastic components could be formed and joined after formation. It is further preferable that the lateral support members 14 are formed during the molding of the head 10 and are integral therewith.
Alternatively, the lateral support members 14 could be formed as part of the handle 2 and integrated with the head 10 when the components are assembled. Still further, the lateral support members 14 could be formed separately and then added to the toothbrush as a component.
It is a further embodiment of the present invention that the head 10 is arranged on a powered toothbrush (not shown). The result is a powered toothbrush having a head 10 with a uniform, smooth and continuous wall of bristles affixed to one end and a handle disposed on the other end of the powered toothbrush. Typically, the handle comprises a powering means for actuating the head 10 of the powered toothbrush. The actuation may be oscillating, rotary, reciprocating, or simple vibration, or a combination of motions. The head 10 may be removable from the power providing handle or formed of a single integrated unit as desired.
The desired objects of the present invention have been met by providing a toothbrush having a uniform, smooth, continuous wall of bristles while using lower cost traditional staple technology. This is accomplished by controlling the height of the legs 23 or 25 of the lateral support members 14. Limiting the height of the legs to a point below the edge 26 of the cavity effectively eliminates gaps between the tufts as they extend past the brush face. Further, there is provided sufficient lateral support for the bristles to ensure that the bristles extend substantially perpendicular to the longitudinal axis of the toothbrush, and allow for easier insertion of subsequent bristle tufts when using traditional staple affixing methods.
Although the invention has been particularly shown and described with reference to certain preferred embodiments, it will be readily appreciated by those of ordinary skill in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.
Claims
1. A toothbrush comprising:
- an elongated member having a head at one end and a handle at the other end, generally aligned along a central longitudinal axis, said head having a brush face including a cavity from which a plurality of bristles extend, said plurality of bristles being arranged in a plurality of tufts so as to extend generally perpendicular to the central longitudinal axis;
- a plurality of lateral support members extending upwardly from a base of the brush cavity;
- attachment means provided in said brush cavity for engaging at least one of the plurality of tufts and for securing said one tuft between adjacent lateral support members, said attachment means having a bottom edge and a top edge, and
- wherein each of the lateral support members extends to a predetermined height from the base of the brush cavity so as to reach at least the height of the bottom edge of said attachment means in said brush cavity.
2. The toothbrush of claim 1, wherein the lateral support member extends to a predetermined height between the bottom edge of the attachment means and the brush face.
3. The toothbrush of claim 1, wherein at least one of the plurality of tufts is affixed by the attachment means between one of the plurality of lateral support members and a side edge of the brush cavity.
4. The toothbrush of claim 1, wherein attachment means is a metal staple.
5. The toothbrush of claim 1, wherein the lateral support members are substantially U-shape.
6. The toothbrush of claim 1, wherein the lateral support members enable the bristles of the plurality of tufts to contact one another at a point in the cavity below the brush face.
7. The toothbrush of claim 1, wherein said attachment means forms a substantially uniform continuous layer of bristles extending from the brush face.
8. The toothbrush of claim 1, wherein the lateral support member has a non-flat top surface.
9. The toothbrush of claim 1, wherein the lateral support walls are curved.
10. A powered toothbrush comprising:
- an elongated member having a head at one end and a handle at the other end, generally aligned along a central longitudinal axis, said head having a brush face including a cavity from which a plurality of bristles extend, said plurality of bristles being arranged in a plurality of tufts so as to extend generally perpendicular to the central longitudinal axis;
- a plurality of lateral support members extending upwardly from a base of the brush cavity;
- attachment means provided in said cavity at least for engaging one of the plurality of tufts and for securing said one tuft between adjacent lateral support members, said attachment means having a bottom edge and a top edge, and
- wherein each of the lateral support members extends to a predetermined height from the base of the brush cavity so as to reach at least the height of the bottom edge of said attachment means in said brush cavity.
11. The toothbrush of claim 11, wherein the lateral support member extends to a predetermined height between the bottom edge of the attachment means and the brush face.
12. The toothbrush of claim 11, wherein at least one of the plurality of tufts is affixed by the attachment means between one of the plurality of lateral support members and a side edge of the brush cavity.
13. The toothbrush of claim 11, wherein attachment means is a metal staple.
14. The toothbrush of claim 11, wherein the lateral support members are substantially U-shape.
15. The toothbrush of claim 11, wherein the lateral support members enable the bristles of the plurality of tufts to contact one another at a point in the cavity below the brush face.
16. The toothbrush of claim 11, wherein said attachment means forms a substantially uniform continuous layer of bristles extending from the brush face.
17. The toothbrush of claim 11, wherein the lateral support member has a non-flat top surface.
18. The toothbrush of claim 11, wherein the lateral support walls are curved.
19. The toothbrush of claim 11, wherein the lateral support member extends to a predetermined height between the top edge of the attachment means and a top surface of said brush face.
20. A lateral support member for holding bristles in a toothbrush comprising:
- a substantially U-shaped formation formed in a cavity of the toothbrush, at least one leg of the U-shaped formation extending to a point between a bottom edge of a staple and a brush face of the toothbrush securing the bristles to the toothbrush.
Type: Application
Filed: Oct 2, 2003
Publication Date: Apr 7, 2005
Applicant:
Inventors: Douglas Hohlbein (Pennington, NJ), Bruce Russell (Howell, NJ)
Application Number: 10/677,553