US1913990A - Toothbrush - Google Patents

Description

June 13; 1933. i v 'IM. A. LEVIN 1,913,990

TOOTHBRUSH Filed Sept. 27, 1932 Patented June l3, 1933 UNITED STATES MOSES A. LEVIN, OF BALTIMORE, MARYLAND,

TOOTHBRUSH Application filed September 27, 1982. Serial No. 685,101.

This invention relates to improvements in toothbrushes and is especially adapted to satisfy the demand arising from the method now prescribed by dental authorities as the roper manner in which the teeth should be rushed; that is, the brushing should be ac.- complished b a vertical motion from the gums outwar ly toward the teeth.

This invention aims to provide a toothbrush in which the teeth may be easily and efliciently brushed by the method described hereinbefore and at the same time massaging the gums which is extremely advantageous for stimulating and exercising these 9 regions which will tend to make the gums more firm and therefore increase their resistance against disease.

With this in view the invention concerns iltself with a toothbrush structure having a so handle member and upon one end is formed a round convexed surface, provided with a series of rows of bristles. being substantially the same length, which together act on a cleaning and massaging element. The bristles upon the convexe surface of the headbeing of uniform length, their outer extremities are of the same curvature as the head, whereby each tuft of O are anchored in the head 2 1n any convenient manner and are of substantially the 75 bristles are supported with equal rigidity, so this prohibits any tuft of bristles from interfering with any other tuft during the brushing process by overlapping the same. A uniform shaped brushing surface is ap lied to the teeth and ums regardless o the angle the handle 0? the brush is held, that is, regardless of whether the handle is held vertically or horizontally, or any angle within a circle. This is also true of lateral movements of the handle, depending upon the degree of curvature of the convexed head. a I

In the drawing which illustrates the preferred embodiment of the invention Figure 1 is a plan view of the brush seen from the front.

These bristles Figure 2 is a cross section view taken along line a,-w of Figure 1.

Figure 3 is a plan View of the back.

Figure 4 is a back View similar to Figure 3 but on a small scale illustrating the use thereof. 1

Referring more particularly to the details of the drawing in which-similar reference numerals designate corresponding parts throughout the several views: numeral 1 represents the handle of the toothbrush which is constructed of an desirable material, preferably of celluloi or like composition. The handle has a reduced portion at 6 and terminates in ajzround head portion 2, the back of which is preferably that as shown at numeral 5, the front having a convexed surface 7 in which the bristles 4 are anchored. Circular rows of holes 8 are formed in the convexed surface for the purpose of anchoring the bristles 4. The holes each being bored rpendicular to a tangent to the curved sur ace, the outer row of holes 9 are spaced inwardly from the edge of the circular head 2 approximatel one sixteenth of an inch as shown at 3 in Figure 2. The head portion 2 is sli htly curved rearwardly at 10 as shown on igure 2. The bristles 4 same length.

In Figure 4 of the drawing there is shown the improved toothbrush being applied to the outside of the upper teeth, the handle 1 may be moved through an are as shown at 1 without changing the relative position of the brush upon the teeth.

As thebrush is designed especially for brushing the teeth by a vertical motion, the advantage of being able to grip the handle 35 at an angle as the position of the teeth being rushed necessitates, permits a more even and greater pressure to be applied to the teeth than by an ordinary toothbrush when being used in this manner. The

bristles being anchored on a convexed surface as described hereinbefore are so arranged upon the convexed head surface that the bristles are never in a position whereb the may become wedged between the teet an the gums during the brushing process, which is the common fault with toothbrushes now. on the market designed for the purpose of simultaneously cleaning the teeth and massaging the gums.

While I have illustrated and described my invention, I do not Wish to be limited to the particular disclosure and description of use as the scope of my invention is best defined in the following claim.

Having thus described my invention what I claim is:

A toothbrush comprising a handle member, a round head portion integrally formed on one end of said handle, said head portion having one of its surfaces convexed and the other surface substantially flat, the handle being connected with the round head portion at a point located at the periphery of said head,-a plurality of bristle tufts arranged .upon the convexed surface of said head forming a convexed bristle face, said tufts being anchored to the convexed surface perpendicular to a tangent at said anchoring point, said bristle tufts being of substantially the same length.

In testimony whereof I affix my signature.

MOSES A. LEVIN.

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