US1115165A - Brush. - Google Patents

Description

E. A. BRIGGS.

BRUSH.

APPLICATION FILED PEB.13. 1914.

Patented Oct. 27, 1914.

Invenior Edar A. Briggs,

. smooth and even, in which bristles shall be firmly locked in place. so as torender removal impossible without destruction of the brush,

' various purposes.

EDGAR A. BRIGGS, OF HOPKINTON, MASSACHUSETTS.-

BrwsH.

Specification of Letters Patent Patented Get. as, here.

Application filed February 13, 1914. Serial No.. 818,597.

To all whom; it mayconcern Be it known'that I, EDGAR A. BRIGGS, a citizen of the United States, and resident of Hopkinton, county of Middlese'x, State of Massachus etts, have inventedan Improvement in Brushes, of which the following description, inconnection with the accompanyingdrawing, is a specification, like characters on the drawing representing like parts.

This invention relates to the construction of brushes. y

The invention in its preferred form is particularly useful in connection with tooth brushes or brushes'which it is particularly desirable shall be kept in a sanitary condition or which shall becapable of ready sterilization. But the invention is equally applicable to brushes :of varying sizes and for The object of the invention'is to provide a brush in which the brush back shall be in which the brush shall be thoroughlysanitary, and in which the brush may be sterilized in boiling water or other liquids with out injury to its construction.

The nature of the invent-ion will appear more fully from the accompanying description and drawings and will be particularly pointed out in the appended claims.

The drawings represent a preferred form of brush and illustrate steps in the process of manufacture, involving the invention, the brush illustrated being a tooth brush.

In the drawings, Figurc' 1 is a View in perspective of a novel form of double ended tooth brush embodying theinvention; Fig. 2 is a cross-section taken through a .line of apertures in the brush back, and showing the steps in theprocess .ofinserting the bristles; Fig. 3 is a similar view af er the bristles are inserted showing the steps in the process at any time.

With this invention the hack and handle of the brush may be made throughout of metal so that the only non-metallic material in the brush are thebristles themselves.

The construction is such that when the brush is completed it is impossibleto pull out or remove the bristles or for them to work loose-without the destruction of the. brush back. There are no projecting parts or no parts liable to work loose and PIOJQCt from theback, thus insuring a perfectly smooth back to the brush.

The brush shown in the drawings as illustrative'of the invention is preferably made of aluminum, but any other suitable metal or material may be employed for that purpose. The brush is shown as double ended having a handle 1 terminating in the brush backs 2 and .3, the former being shown as rectangular and elongated, and the latter as circular. These brush" backs are connected to the'body of the handle 1 by peculiarly shaped necks 4 and 5 which enable one or the other of thebrushes to be fitted into the mouth and brought into contact with any portion of the teeth needingcleansing.

So far as the invention herein involved is particularly concerned the shape of the back of the brush is not'material and is equally applicable to any shape such as that illustrated at 2 or that illustrated at 3 or other usual shapes.

The brush from the process which will now, be described.

The back 2 is first provided of suitable material such as aluminum of proper shape, size and thickness, according to the required purpose. Pairs of apertures are then formed through the back as by drilling or punching', three of such pairs of apertures being illustrated in Fig. 2, the members of each pair being designated at 6 and 7 respectively.

These apertures should be of 'suflicient diameter to receive and hold snugly tufts of bristles of the desired size. A groove is v formed in the upper face of the back conbristles may be of any suitable material such as is employed in the manufacture of forming the invent-ion results brushes. Each set of bristles is then doubled in its middle, a wire 8 or "other suitable device is inserted through the loop end of a set of doubled bristles, the wire followed by the set ofbristles is pulled up through one aperture as 6 of a pair of apertures, until the bristles project from the face of the back to the required extent. ,At the completion of this step of the operation the set of bristles are in the position illustrated in the middle pair of apertures of Fig. 2. The loop end of the set of bristles is then bent over toward the back, the wire 8 is inserted through the aperture .7,. and is pulled .through, pulling after it the loop end of the bristles until the bristles take the position illustrated in the left hand pair of apertures, in Fig. 2, ,with the central portion of the-bristles lying in the groove, and the bristles thus pro ecting in two tufts throughthe apertures from the bottom face of the back. The loop end of each set'is trimmed ofi then orsubsequently leaving the bristles in the form shown in the right hand pair of apertures in Fig. 2.

A filler orlocking plug 1s provided, and

this is preferably of U or staple shape, and

v of that portion of the apertures,and connecting groove lying above the bent middle section of the bristles, but is somewhat larger in size, so that when it is forced intov them in place, and still project somewhat above the surface of the back. This filler,

' such as 9, is next inserted place and forced into place by driving or swedging until it fillsup completely the space between the bristles and the back of the brush, and locks the bristles firmly in place. The completion of this step of the operation is shown in the middle section of Fig. 3. When all the fillers have been inserted the back of the brush is then finished off. by ;rinding and polishing, or in any other suitable man- 'ner, thus removing the projecting portion of the fillers 9 and leaving the upper surface of the back smooth and even.

It will thus be seen that all the objects of the invention are accomplished, that the back'of the brush is perfectly smooth, that there is nothing projecting therefrom excepting the bristles, that there is nothing which can work loose from the back, that (the bristles are firmly locked in place, and

cannot be removed or pulled out or work loose, that the brush is thoroughly sanitary, and especially when'made of metal, comprises nothing but the metal of the back and the bristles themselves, and that it is capable of sterilization in boiling water or other liquid.

what I claim as new and desire to secure by Letters Patent is:

1. A brush comprising a back provided with apertures extending therethrough in pairs, connected by a groove on the upper face of the back, a set of bristles in each pair of apertures having the middle portion in said groove and the ends projecting through said apertures from the lower face ofthe back, a locking plug wedged into and filling said groove and apertures above the bristles and finished off flush with the upper surface of the back.

Having thus fully described my invention,

.2. A brush comprising a $0110. metal back provided with apertures extending therethrqugh in pairs connected by a groove on the upperface of the back, a set-of bristles in each pair of'apertures having the middle portion in said groove and the ends projecting through said apertures from the lower face of the back, a staple shaped metal locking plug wedged into and filling said groove and apertures above the bristles and finished ofl flush with'the upper surface of the back. In testimony whereof, I have signed my name to. this specification.

. I EDGAR A. BRIGGS. Witnesses:

NATHAN HEARD, ELIZABETH G. MORRIS.

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