US1601217A - Brush - Google Patents

Description

Sept. 2s, 192e.

F.- R. JONES BRUSH Filed Nov. 1v, '.1924

retenes sept. as, leze.

les.

FRANK R. JONES, 0F NORTHBRO, MASSACHUSETTS, ASSIGNOR TO 'NORTI-IBORO BRUSH COMPANY, OF NORTHBORO, MASSACHUSETTS, A COREORATION OF MASSA# cHUsnTTs.

1 BRUSH.

Application led November 17, 1924.. Serial No. I?50,230.

This invention relates to a brush construction capable of general use but particularly dapted for application to a. tooth brush.

The principal object of the invention is a to provide a solid back tooth brush with a positive means for holding the bristles so that they can not shed. This is accomplishedaccording to the present invention by the use of a metallic cup for thevbrist-les 1 0 and the formation of this cup in a certain Way, as Will appear, to hold them.

i Another object of the invention is to provide a cup of this character Which Will not be rusted or otherwise affected by cleansing compositions that-are used.

Referencel is tobe had to the accompanyingdravvings in Which o Fig. 1 is aside view of a tooth brush constructed in accordance with this invention partly in longitudinal section to shoiv lthe Way the bristles are held lin place; a y

l? 2 is an enlarged plan view of a small portion of the brush to illustrate the VWay the metal cap appears in the completed brush;

F ig. 3 is an enlarged cross sectional view of the blank of which the metallic cap is formed; and

Fig. 4 is al similar view showing itin its final stage With the bristles therein.

` In making a'brush according to this invention I bore into the front of the solid back and set in a metallic cup for holding the bristles. A metallic cup is provided Which is not affected by the various ingredients of numerous kinds of tooth paste, powders, and soaps. It is necessary to provide a Way in which the bristles can be held in such a manner that there is little likelihood of their coming loose.

This invention rela-tes to the manufacture of a high grade brush employing the best bristles that can be procured. Obviously, there is not much advantage in using high grade bristles if they will come out after a short period of use. All the problems that have been mentioned above therefore had to be solved and the Ways in which they are solved in this brush cooperate with each to produce a brush which have much greater durability than the ordinary brushes on the market. i

Enough has been said to shovv that the brush back 10 which is integral with the handle and usually formed of Celluloid or similar material isv bored in `from one side part Way through only to forni cavities for the reception of the metal cups Which are to be used. These metal cups are formed as blanks 11 of a general cylindrical form with a closed bottom and with an annular ridge 12'around them at a small distance fromthe open end. This is spaced from the open end only a short distance. In order to avoid the diiii-ulties which other metals Would be subjected to,` as described above, Irmake this blank of commercial aluminum alloy or other suitable material. This Will stand all thev ingredients Which have yet been found in various tooth preparations and even after long use the surface of the aluminum Will be of the same color and polish that it had when originally manufactured. There is no deterioration of the aluminum on the surface or even lin the `space which receives the bris-V tles that can be detected. This is an imJr portant feature of the invention. I prefer to use a commercial aluminum Which contains about 96 per centaluminum.

This blank 11 is then provided With double over tuft 13 of bristles. Then pressure is applied to the annular ring 12, by a spinning operation. or bv rotating the blank and rolling a surface thereon to press the blank in or' by pressingy dies. forms an internal ridge ld'ent-irely around the bristles and containing the metal previously supplied in the form of the annular ridge 12. The exterior of the finished cup is nlade cylindrical and smooth, except for minute depressions 17 and longitudinal fins In this Way the original diameter of the cup is retained atthe mouth. By that I mean that there is a concave cylindrical Wall 15 for a short distance in from the mouth that prevents the tufts from flaring too much. In this Way the tufts are held in approximately parallel condition and Whatd ever tendency they have Hare will be The pressure Si i) a the claims.

checked by the confining action of the mouth of' the cup.

These cups with their bristles are then insorted in the cavities in the brush blank and pressed into place. Gn account of the properties of the aluminum and celluloid they will bc firmly held in posit-ion and there is vno danger of their Working loose. The tins 1S, when present. further assist in holding them in place. If the cups Were formed of some metal Which might be affected by acids and alkalies with which they come in contact they might Work out before the bristles.

This furnishes a very durable brush and one in which the back and the fastening of the bristles is sure to last as long as the bristles themselves and there can be no shedding of them. Furthermore, no anchor is required in the bottom of the doubled over tufts. It will be understood. of course that with this firm manner of securing t-he bristles in the cup, a doubled over tnft of lristles is not absolutely' necessary. If the bristies are set in in one length. they Will also be held firmly in the space but I prefer to double them. This constitutes a very high class, durable brush that is sanitary and not as expensive as many other brushes that have been put on the market.

I am aware of the fact that the same principles can be employed for other brushes than tooth brushes and do not Wish to be limited thereto excegt expressed in thc` claims. Although I hare illustrated and described only a single forni of the inyen` tion, I am aware of the fact that modilica` tions can be made therein by any person skilled in the art Without departing from the scope of the intention as expressed in Therefore I do not Wish to be limited to all the details of construction herein shown and described, but what I do claim is 1. As an article of manufacture, a` brush made up of a back and a series of tufts of bristles and a cup haring a solid bottom in which each tuft of bristles set. the opening of each cup being of substantially cylindrical bore and long enough to hold the lristles substantially straight and parallel at the circumference of the tuft and prevent flaring, and an inwardlyv extending cireumferential ridge on the inner wall at a distance belov.Y the rim of the cup for holding the bristles permanently therein, the outer surface of the eng being of approximately uniform size throughoutits length.

2. As an article of manufacture, a tuft of bristles and a cup in which the tutt of bristles is set, the inner Wall of said cup haring a circumferential ridge at a distance belowI the open end for holding the bristles therein, the outer surface of the cup being cylindrical and of approximately uniform diameter, from the open end thereof to and belenv said circumferential ridge.

3. The method of making a tuft of bristles which consists in forming a metallic cup of substantially cylindrical bore with a solid bottom and an annular ridge around the cup at a short distance from its open end, inserting a doubled over tuft of bristles into said cup and then pressing the ridge in- Wardly and uniformly all around until it is flush en the exterior so as to form an internal ridge at a distance from the end for holding the bristles.

In testimony whereof I have hereunto affixed my signature.

FRANK R. IGNES

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