US2075570A - Brush and method of making same - Google Patents

Description

March 30, 1937. w. w. s. CARPENTER 2,075,570

BRUSH AND METHOD OF MAKING SAME Filed Feb. 2'7, 1955 Q G e mm 0 155 iLUUlia/rww. SCwpenier Patented Mar. 30, 1937 UNITED STATES 2,075,570 BRUSH AND METHOD OF MAKING SAME William W. S. Carpenter,

to Sanford Manufacturing corporation of Illinois Oak Park. 111., assignor 00., ChicagoJlL, &

Application February 2'1, 1935, Serial No. 8,499 12 Claims. "(01. 300-21) This invention relates to a new and improved brush and method of making the same. More particularly this inventionrelates to a brush of the applicator type, that is to say, a brush to be used in the application of-liquid or semi-liquid substance to a surface or to another substance. This invention relates furthermore to a brush in which the handle and the hair-holding portions are formed as a unitary structure.

It is an object of this invention 'to provide a brush and a method for ma mg the same in which the handle and the hair-holding portions thereof are formed as a unitary structure.

It is another object of this invention to provide a brush and method of making the same which is highly resistant to the normal forces of brush decay and brush disintegration.

. It is another object of this invention to provide a brush and method of making the same which is more resistant to the action and type of wear which tends to pull the hairs out of the hairretaining socket.

It is another object of this invention to provide a brush and method for making same which .does not permit any substantial amount of the liquid being applied to run back into the hairretaining portion of the brush.

Another object of this invention is to provide a cheap, economical and highly efficient brush and method for making same.

Numerous other objects and advantages will be apparent throughout the progress of the following specification.

Figure l is a perspective view of the brush, handle and hair-portion just prior to the assembly thereof.

Figure 2 is a perspective view of the completed brush.

Figure 3 is a cross section of the fully completed hair-retaining portion of the brush.

Figure 4 is a perspective view of the die and matrix showing the formation of the hair-retaining portion of the handle.

The preferred embodiment of this invention shown in the drawing comprises a handle l which is made of some thermo-plastic material, preferably hard rubber. In the forward end of this handle is formed a hair-retaining portion 2 which comprises a socket 3 formed in the material of the handle. Into this socket 3 is inserted a tuft of hairs 4. This tuft of hairs d may be made or" any desirable number of hairs gathered together, depending upon the desired size of the brush. These hairs may be prepared in the customary manner of folding them back against ing device which practically nigh impossible to destroy the hair-retaining porthemselves at the middle so that each hair assumes the shape of a long narrow U, this bend of the U-shape being indicated at 5 in Figure 1. n the other hand, this tuft of hairs may be formed from a number of shorter straight hairs aligned evenly along the edge and held together by some cement material. Finally the hairs, when folded in the U-shap'e fashion above described, may be dipped in a cement material, if it is desirable to do so. This cement material may be any form of glue or adhesive substance. It is thought preferable to use some thermo-plastic cement material so that when the tuft of hairs thus prepared is inserted into the socket, it will be held there rigidly. After the tuft of hairs has been inserted into the socket 3, the hairreteim'ng portion of the brush 2 is heated to a point at which the material out of which the handle of the brush is made becomes moderately plastic. At this point the hair-retaining portion 2 is squeezed between the jaws of a suitable pressimpresses therein the slight channel 5 and at the same time forces together the retaining edges T and 8, as shown in Figure 3. The completed brush is allowedto cool whereupon the thermo-plastic materials incorporated therein harden and the hairs will then be held permanently and fixedly in place.

It will be seen, by reference to Figure 3, that the tuft of hairs may be held merely by the clamping action of the retaining edges l and 8. When it is desirable to make a brush at a minimum of cost, it will be found that a very effective and satisfactory type of brush can be made without the use of retaining cements merely by folding the hairs in the above described U-shape fashion, inserting them into the heated plastic socket and clamping the edges thereof downupon the tuft of hairs. Ordinarily, by reason of the U-shaped bend in the tuft of hairs. as shown at 9 in Figure 3, the portion of the tuft at 9 be closely consolidated which will prevent the tuft from being pulled out from between the retaining edges l and 8. If, on the other hand, greater expense in the manufacture of the brush is justified, it is possible to insert this portion 8 into a thermo-plastic cement prior to the insertion thereof into the re-=' taining socket of the handle. In such event; the thermo-plastic cement will flow upwardly into the space in. If the thermo-plastio cement is of a character which will fuse with the theme-plastic material of the handle, the whole will become unitary. If this is done, it is welltion of this brush.

I and manufacture of For the sake of greater clarity it might be well to refer momentarily to one by which the handle and socket portion of the brush may be made. A red, preferably of the and tend to curve inwardly, whereby to clamp the tuft of hairs more securely in place.

It has been found that a brush made by the above described method is far more satisfactory for many purposes as an applicator. In the use means of a metal ferrule.

. brushes made in such a manner are exceptionally manufacture of this brush, one has a brush which vulnerable to penetration into the hair-retaining portion of the heel by the liquids or substances being applied therewith. For instance, the liquid may run back along the hairs of the brush and directly into the "heel, or the liquid may run down into the top of the heel from the space at the juncture between the ferrule and the wood of the handle. All of these disadvantages tend to rot the heel of the brush and disintegrate the tuft of hairs therein. In the present invention, however, the handle and the hair-retaining portion, that is to say, the portion corresponding to the metal ferrule in prior brushes is .made of a unitary structure so that one large source of trouble is immediately eliminated. Furthermore, the forward retaining edge of the hair-retaining portion of the brush lends itself to a strong clamping action such as cannot ordinarily be achieved in metal ferrule brushes. Furthermore, if desirable, the heel retaining space not filled by hair can be filled with some thermo-plastic or other cement-like material. This operates to provide a retaining edge for the socket of the substance up along the hairs, into the heel" of the brush. Among other advantages of the invention it might be mentioned that by reason of the type of materials which are peculiarly adaptable to the, present method and article a brush can be made which is, for all practical purposes, resistant to chemical action. Where the handle, for instance, is made of hard rubber and a hard rubber type of thermo-plastic cement is used in the socket, one has a brush which will be durable and give long service even when used in of muriatic acid to metals prior is done frequently in the tinsmith trade. reason of the complete absence y of metal in the is absolutely'rust-proof. Thus. when used as a paste applicator, a brush made according to the preferred method v held within said socket, said tuft -of hairs which is held within said a tuft of hairs within said socket and extending a substantial distance beyond the of said socket, said tuft of hairs ingly held between the forward socket.

2. A brush comprising a handle made of a thermo-plastic, substantially non-elastic material, a socket integrally formed within said handle, a tuft of hairs within said socket and extending a substantial distance beyond the forward edge of said socket, an adhesive material disposed along that portion of said tuft ,of hairs which is of hairs being furthermore clampingly held between the forward edges of said socket.

-3. A brush comprising a handle made of hard rubber, a socket integrally formed within said handle, a tuft of hairs within said socket and extending a substantial distance beyond the forward edge of said socket, said tuftpf hairs being clampingly held between the forward edges of said socket.

4. A brush comprising a handle made of hard rubber, a socket integrally formed within said handle, a tuft-of hairs within said socket and extending a. substantial distance beyond the forward edge of said socket, an adhesive material disposed along that portion of said tuft of hairs which is held within said socket, said tuft of hairs being furthermore clampingly held between the forward edges of said socket.

5. A brush comprising a handle made of hard forward edge being clampedges of said rubber, a socket integrally formed within said handle, a tuft of hairs within said socket and extending asubstantial distance beyond the forward edge of said socket, a thermo-plastic cement disposed along that portion of said tuft socket, said tuft of hairs furthermore clampingly held between the forward edges of said socket.

6. The method of making a brush which comprises heating a rod made of thermo-plastic material, forming a socket in one end of said rod while heated, placing a tuft of hairs within said socket and clamping the forward edges of said socket down upon said tuft of hairs, while heated.

7. The method of making a brush which comprises moderately heating a rod of hard rubber, forming a socket in one end of said rod while heated, placing a tuft of hairs within said socket and clamping the forward edges of said socket down upon said tuft of hairs.

.8. The method of making a brush which comprises heating a rod of thermo-plastic material, forming a socket in one end thereof, forming a tuft of hairs, dipping one end of the tuft of hairs into an adhesive cement, inserting said dipped end into said socket, and subjecting the forward edges of said socket to pressure whereby to clampingly engage said tuft of hairs.

9. The method of making a brush which comprises heating a rod of hard rubber, forming a socket in one end thereof, forming a tuft of hairs, dipping one end of the tuft of hairs into an adhesive cement, insertingsaid dipped end into said socket, and subjecting the forward edges of said socket to pressure whereby to clampingly engage said tuft of hairs.

10. The method of making a brush which comprises heating a rod of hard rubber, forming a socket in one end thereof, forming a tuft of hairs, dipping one end of the tuft of hairs into a thermoplastic cement, inserting said dipped end into said socket, and subjecting the forward edges of said socket to pressure whereby to clampingly engage said tuft of hairs.

11. A brush comprising a rod of hard rubber, a partially ellipsoidal recess formed in one end thereof, and a tuft of hairs within the recess, said recess furthermore having a pair of oppositely disposed depressed lips clampingly engaging the tuft of hairs along opposite sides.

12. The method of making a brush which comprises forming a socket portion from a solid material which becomes plastic upon heating, placing a tuft of hairs in said socket, and-clamping portions of said socket into engagement with said tuft of hairs while said portions of said socket are heated to such a temperature as to produce plasticity.

' AM W. S. CARPENTER.

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