Toothbrush
A toothbrush includes a head having multiple cleaning elements. One set of the cleaning elements is longer than the other and relatively rigid. That set alternates with a shorter, springier set of cleaning elements. The flexibility of the shorter springier cleaning elements facilitates penetration of the longer cleaning elements into the interproximal area of the user's teeth.
Latest Patents:
The present invention is directed to a toothbrush, either manual or powered, which includes a handle and a head. Cleaning elements are mounted to the head such as tufts of bristles. When toothpaste is applied to the cleaning elements the user inserts the head into the mouth and brushes the teeth in a known manner.
The head of a conventional toothbrush usually has a flat or slightly altered surface to which cleaning elements are attached. Usually the cleaning elements are strands of plastic material(s) formed into tufts, bundles or other groupings. The strands are attached to the head either before or after forming the toothbrush. Cleaning elements should be arranged in the head so that all areas of the teeth are cleansed, particularly the interproximal spaces.
One approach to cleaning of tooth surfaces is disclosed in U.S. Pat. No. 4,519,111 issued to Paolo Cavazza on May 28, 1985. This patent discloses a toothbrush where dual sets of cleaning elements are used. One set increases in height the further they get from the distal end of the toothbrush and the second set is the same height across the length of the toothbrush head (column 1, lines 27-33).
Another approach to tooth cleansing using cleaning elements of varying height is described in U.S. Pat. No. 5,896,614 issued Apr. 27, 1999 to Flewitt. This patent discloses rows of strips or alternating rows of strips and bristles running perpendicular to the longitudinal axis of the toothbrush. The longitudinal profile of the alternating rows may be flat or undulating. The transverse profile may be concave, “V” or “U” shaped (Column 1, lines 53-66). In one embodiment, the greater dimension of the strips is aligned parallel to the longitudinal axis of the toothbrush (column 2, lines 32-40, FIGS. 5-7); in another embodiment perpendicular to the longitudinal axis (
U.S. Pat. No. 5,341,537 issued Aug. 30, 1994 and assigned to the assignee of the instant application, discloses an arrangement of bristles designed to improve removal of plaque from teeth. Three groups of cleaning elements are disclosed. The first is a relatively wide set of elements arranged in rows perpendicular to the longitudinal axis of the toothbrush. This group is generally shorter than the other groups of cleaning elements. The second group is also aligned with the first group in rows but with the outboard tufts of cleaning elements slanted toward the outside periphery of the toothbrush head. The third group of cleaning elements is tilted laterally (about 30E) towards the outside of the toothbrush head and tilted to a lesser degree to the distal and/or proximal end of the toothbrush head (column 3, lines 25-56). This angulation of some bristles assists in sweeping plaque from the teeth at the gumline and from in-between teeth (column 5, lines 10-16).
SUMMARY OF THE INVENTIONThis invention addresses the problem of getting the cleansing action of toothbrush bristles into the interproximal areas of the teeth. A problem common to many prior art toothbrushes is that the stiffness of some bristles keeps other bristles away from the teeth. Thus, in a typical brush, the bristles readily cleanse the outer surfaces of the teeth but few bristles reach the areas between teeth, i.e., the interproximal areas.
This invention solves this problem by using alternating sets of cleaning elements or bristles. One set is longer than the other and has relatively rigid bristles that can reach into the interproximal areas. The other set comprises shorter, springier bristles that easily compress under load.
Preferably, the first set of more rigid bristles are spaced from each other a distance that approximates the average width of a tooth so that they are better positioned to fit into the areas between the teeth. The sets of shorter springier bristles are located in the areas between the sets of longer rigid bristles. The shorter bristles are preferably crimped or otherwise constructed to permit ready compression when the user applies pressure on the toothbrush. As the shorter, springier bristles compress under that pressure, the longer rigid bristles will extend further into the interproximal areas. This combination of bristle types facilitates cleansing of all portions of the teeth.
THE DRAWINGS
The invention is particularly suitable for cleaning elements in the form of strands or bristles attached via anchor free tufting (AFT). In anchor free tufting a plate or membrane is mounted in the head generally by using ultrasonic welding of the plate or membrane to portions of the head. Bristles extend through the plate or membrane. The free or outer ends of the bristles perform the cleaning function. The inner ends of the bristles on the opposite side of the plate or membrane are melted together by the application of heat to create the anchor free tufting.
In the embodiment of the invention illustrated in
The balance of head 14 contains alternating rows of relatively rigid and springy cleaning elements 22. The spacing between adjacent rows of relatively rigid cleaning elements preferably approximates typical spacing of teeth in the human mouth. As illustrated in
As illustrated in
The embodiment of
As with the embodiment of
The various embodiments of the invention may have each row of rigid cleaning elements 24 to be of longer length across the brush head than the springy cleaning elements 26, as in
The various embodiments could be practiced where each of the cleaning elements extends laterally across generally the entire width of the cleaning head 14 with the other elements extending a lesser distance, as in
As also illustrated, in the preferred practice of this invention the combination of the sets of alternating rows of cleaning elements has the rigid cleaning elements as the outermost row of the combination.
Any suitable form of cleaning elements may be used as the cleaning elements 22 in the broad practice of this invention. The term “cleaning elements” is intended to be used in a generic sense which could include conventional fiber bristles or massage elements or other forms of cleaning elements such as elastomeric fingers or walls arranged in a circular cross-sectional shape or any type of desired shape including straight portions or sinusoidal portions. Where bristles are used, the bristles could be mounted to tuft blocks or sections by extending through suitable openings in the tuft blocks so that the base of the bristles is mounted within or below the tuft block.
It is to be understood that the specific illustration of the cleaning elements is merely for exemplary
purposes. The invention can be practiced with various combinations (such as AFT bristles, etc.) and/or with the same bristle or cleaning element materials (such as nylon bristles, spiral bristles, rubber bristles, etc.) Similarly, while the Figures illustrate the cleaning elements to be generally perpendicular to head 14, some or all of the cleaning elements may be angled at various angles with respect to the upper surface 20 of head 14. It is thereby possible to select the combination of cleaning element configurations, materials and orientations to achieve specific intended results to deliver additional oral health benefits, like enhanced cleaning, tooth polishing, tooth whitening and/or massaging of the gums.
Handle 12, including head 14, is preferably made of hard plastic material which is used for manual toothbrushes.
This invention may also be practiced where the head 14 includes one or more power or electrically operated movable sections carrying cleaning elements.
Claims
1. A toothbrush comprising a handle, a head secured to the handle, a first set of cleaning elements mounted on the head which are relatively rigid and are longer than other sets of cleaning elements mounted on the head, and a second set of cleaning elements which are springy and more easily compressed than said first set of cleaning elements, and said first and second sets of cleaning elements being arranged in alternating lateral rows on the head.
2. The toothbrush of claim 1 wherein said rows of said first set of cleaning elements are spaced from each other a distance approximately equal to the average width of a human tooth.
3. The toothbrush of claim 1 wherein said second set of cleaning elements have an “S” shape over at least a portion of their length.
4. The toothbrush of claim 1 wherein the upper surface of the first set of cleaning elements has a V-shaped profile.
5. The toothbrush of claim 4 wherein each row of said first set of cleaning elements comprises a pair of longitudinally adjacent cleaning elements having tapered tops to form in combination said V-shaped profile.
6. The toothbrush of claim 1 wherein each of said second set of cleaning elements is in the form of a compressible pad which supports its cleaning elements.
7. The toothbrush of claim 6 wherein said compressible pad is made of a compressible soft hollow elastomer, and its said cleaning elements are fiber bristles mounted on the outer surface of said tab.
8. The toothbrush of claim 1 wherein said rows of first cleaning elements extend a further distance across said head than said rows of second cleaning elements.
9. The toothbrush of claim 1 wherein said first sets of cleaning elements are located at the outermost ends of the combination of said first and second sets of cleaning elements.
10. The toothbrush of claim 1 wherein at least one row of said first set of cleaning elements comprises longitudinally adjacent cleaning elements.
11. The toothbrush of claim 1 wherein at least one row of said second set of cleaning elements comprises two longitudinally adjacent cleaning elements.
12. The toothbrush of claim 1 wherein said toothbrush is a manual toothbrush.
13. The toothbrush of claim 1 wherein a portion of the toothbrush includes a powered cleaning element.
Type: Application
Filed: Feb 18, 2005
Publication Date: Jun 30, 2005
Applicant:
Inventor: Douglas Hohlbein (Pennington, NJ)
Application Number: 11/062,064