US1338821A - Rotary toothbrush - Google Patents

Description

M. EISNER AND A. M. FREEMAN.

ROTARY TOOTHBRUSH.

APPLICATION FILED OCT. 20, 1919.

Patented May 4, 1920.

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MAX EISNER AND ALBERT M. FREEMAN, 0F SIOUX FALLS, SOUTH DAKOTA.

ROTARY TOOTHBRUSH.

Specification of Letters Patent.

Patented May 4, 1920.

To all whom it may concern:

Be it known that we, MAX EISNER and ALBERT M. FREEMAN, citizens of the Unlted States, residing at Sioux Falls, in the county of Minnehaha and State of South Dakota, have invented certain new and useful Improvements in Rotary Toothbrushes, of which the following is. a specification.

This invention relates to certain new and useful improvements in tooth brushes, and. the primary object thereof is to provlde a tooth brush which embodies rotary brushes actuated by means of a corrugated or roughened member which engages with the ends of the teeth, so as to effect rotation of the brushes in unison and with a posltive drive and against the front and rear faces of the teeth.

The invention further aims to provide a rotary brush which is of simple and economical construction and wherein both brushes are directly mounted upon the ends of the frictional driving means.

Further and other objects will be later set forth and manifested in the course of the following description.

In the drawings:

Figure 1 is a top plan view of the invention;

Fig. 2 is a side elevation; and

Fig. 3 is a section taken on line 3-3 of Fig. 1.

In proceeding in accordance with the present invention, a handle 1, is employed which has a forked end, the arms 2, 2, of the forked end being spaced apart and havin the shaft 3, journaled therein, the shaft bridging the 7 space between the arms as depicted in the drawings.

The ends of the shaft are preferably mounted in bushings 9, as shown in Fig. 3. A sleeve 4, is rigidly secured to the shaft 3, and has end walls or disks 5, the latter provided with inturned circular flanges 6, the parts 5 and 6, forming cup-like structures as is evident from Fig. 3, of the drawings. Bristles, forming brushes, are rigidly secured in the cup-like parts, and have their free ends confronting each other in spaced relation. These bristles, forming the brushes 7, are consequently supported from the sleeve 4, which latter surrounds and in turn is supported by or from the shaft. A corrugated roller, preferably formed of rubber is directly mounted on the sleeve 4, the corrugations being for the purpose of enabling the roller to obtain a roller designated 8, further acts to brace the brushes, by being interposed in the space between the free ends of the brushes, as illustrated in Fig. 3, of the drawings.

In operation, the brush is applied to the teeth with the roller 8, engaging the end edges of the teeth, thereby disposing the free ends of the brushes on the respective front and rear faces of the teeth, whereu on the brush is moved back and forth by t e handle, effecting corresponding rotation of the two brushes in unison, thereby brushing the front and rear faces of the teeth simultaneously. Since the brushes and roller are rigidly mounted on or borne by the shaft 3, it will be apparent that direct drive of each brush is obtained.

In addition a balanced structure is afford ed, since the corrugated roller lies centrally between the brushes.

What is claimed is:

1. In a rotary tooth brush, a forked handle, a shaft journaled in the ends of the fork, a sleeve mounted on the shaft and rigidly connected thereto, a central corrugated yielding roller on the sleeve rigidly carried thereby, the ends of the sleeve being formed with cup-like parts, and brushes mounted over the ends of the sleeves and within the cup-shaped parts and having their free inner ends engaged adjacent the ends of the corrugated roller.

2. In a rotary tooth brush, a handle, a shaft borne by the handle, a central corrugated yielding roller mounted on the shaft, and a pair of brushes also mounted on the shaft and disposed at opposite ends of the corrugated roller, the roller and brushes being rigidly connected to the shaft so as to simultaneously rotate therewith and said roller being formed of yielding material to allow same to be engaged with the edges of the teeth.

3. In a rotary tooth brush, a handle, a shaft borne thereby, a roller mounted on the shaft to engage the edges of the teeth and thereby to rotate the shaft, and-a pair of brushes also mounted on the shaft so as to be rotated in unison thereby, said brushes disposed at opposite ends of the roller so as to brush the front and rear faces of the teeth.

.4. In a rotary tooth brush, a support, a yielding tooth edge engaging member Q v v 1,338,821

' brushes having free ends disposed adjacent to the respective'ends of the tooth engaging member, and a single sleeve carrying said member and brushes whereby the sleeve and brushes will be positively and directly driven through said tooth engaging member.

5. In a rotary tooth brush; a handle, a single shaft carried by the handle to rotate relative thereto, a brush mounted adjacent each end of the shaft, and a yielding tooth 10 engaging member mounted on the shaft and disposed between the inner ends of the brushes.

In testimony whereof we afiix our signatures.

MAX EISNER. ALBERT M. FREEMAN.

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