US1749744A - Brush structure - Google Patents

Description

March 4, 1930. J. THACHER 1,749,744

BRUSH STRUCTURE Fil'ed Feb. 1, 1926 Patented Mar. 4, 1930 'UNITED STATES PATENT OFFICE JOHN J. TEACHER, OF WETHEBSFIELD, CONNECTICUT, ASSIGNOR TO THE FULLER BBUSE' COMPANY, OF HARTFORD, CONNECTICUT, A. CORPORATION OF CONNECTICUT BRUSH STRUCTURE Application filed February 1, 1926. Serial No. 85,086.

and an object of the invention, among others,

is the provision of means for causing thebristles or similar material com ressed in the brush structure to flare outwardly to a maximum degree.

One form of brush structure embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained, is illustrated in the accompanying drawings, in which Figure 1 is a perspective view of my improved brush structure with the end of the same shown in section.

Figure 2 is an end view.

Figure 3 is a perspective view of a piece of thecore strip alone.

Figure 4 is a detail view of portions of brush rolls in position to fasten portions of the brush structure together. I

Figure 5 is a view of a fragment of the brush structure with parts broken away to illustrate the closing in'of the sides of the channel piece in the cutting operation to secure the bristles from coming out at the ends of the I cut off strip.

Figure 6 is a detail view in section illustrating a modified form of the invention, scale enlarged.

When bristles are gripped between the sides of a sheet metal channel section they may not flare outwardly as much as desired, the gri of the channel sides against the bristles ten ing to hold them together above the channel so that the brush area presented by the bristle ends is comparatively small. 'In some types of brushes this flared efiect is desired, and the present invention, according to one of its features, is directed to an improved structure with a brush area, at the bristle ends which is comparatively lar e. a

A channel strip is preferably rolled from a simple strip of sheet metal in channel form to receive bristles 8. These may be supplied transversely of the channel section or strip and deposited with a core strip 9 so that the bristles are folded about the core to project upwardly from the channel strip 7 The sides of the latter may then be rolled against the bristles to bind the assembled parts together by pressure. as indicated in igure 4. The sheet metal is preferably stiff enoughand made of a body like soft steel so that the parts are permanently set under pressure by metal working rolls to that holding positionshown in which the bristles are compressed in the strip. These operations of making the structure may be performed by hand, but the: are particularly well adapted to machine operation. The structure is so designed that it may be made continuousl in one machine with great economy. uch a machine is indicated in copendingapplication of Serial Number 75,219, filed December '14, 1925, by Henry Cave.

The core strip 9 may be of the same kind of material as the channel strip 57. It is so formed that its opposite sides extending in transverse directions will cause the bristle body outside of the channel strip to flare outwardly so that the outer ends will comprise a surface much larger in area than a cross section of such body at or near the body of the channel stri This result may be attained in several di erent ways. In one form of construction the core strip '9 may be made with an outer and inner enlargement connected by a comparatively thin web, so that when viewed in sect-ion it is shaped generally like a dumb-bell. core strip in a continuous operation just as the channel strip form may be given to the stri 7 as the improved structure is made.

vahen the brush parts are finally assembled, asindicated in Figures 1 and 2, the enlargement 1O lies with the bristl'w folded about it in the bottom of the channel. In this special form, and in which the part 10 is connected to the outer enlargement 11 by an intermediate integral web 12, the part 10 acts with the web 12 to position the enlargement or part 11 for a particular function which is important.

It will be seen that the enlargement or part 11 is anchored in position to positively. divide the bristles justas they emerge from the constricted pressure neck of the channel strip holding them therein. This results in positively This form may be given to. the

projecting the bristle ends remote area than would be the case if the part 11 were not present in the structure. Not only are the bristles flared outwardly, but the means for accomplishing these results is lo- "cated where the greatest effect can be produced with the least interference with the binding function of the bristles in use. The individual bristle lengths above the channel strip are preferably left entirely free to bend back and forth, but when not bent their naturally spread out condition is imposed by the part lland the side portions of the channel strip 7.

The intermediate part 12 of the core strip is preferably of thin web-like form so as to pass downwardly through the constricted neck portion of thechannel strip with the least possible interference with the preferred function of the neck portion. This function is to so hold the bristles compressed that their resiliency will maintain the pressure strain against the channel section which is desirable to hold all the bristles against slipping lengthwise in the'neck portion. This neck portion is preferably designed inconstricted form to gradually release this pressure strain in the direction toward the edges of the channel strip. It is much better to have the holding pressure on the bristles between the side portions of the channel strip and the intermediate portion of the core strip than to permit this holding pressure to extend between the edges of the channel strip and the outer enlargement 11 of the core strip. There is, of course, some pressure of the bristles against the part 11, but it is a directing pressure where the bristles are loose enough to readily accommodate themselves to the desired flaring action without tendency to break in bend- T have accomplished with this arrangement a structure of one channel strip and a core stripwhich will do the work of substantially two channel strips and with better efficiency. For illustration, consider the cooperation of each side of the channel strip with its adjacent side of the core strip. These twosides function about as one channel strip would. But there are two pairs of such sides so there is a function about equal to two channel strips. The fact that two channel strips could hardly be made of as small bulk as a single channel strip and core gives.an.additional advantage to make the arrangement of this invention preferred in many types of brushes. There is, of course, the additional and very great advantage of my improved structure of simplicity in manufacture.

My invention contemplates other forms of core strip that will act to impart a flaring form to .the bristles," one of such instances being illustrated in Figure 6, in which the inner enlargement 10 is dispensed with and in which construction rivets 13 passed through the sidesof the channel piece and web may or may not be employed.

The ends of any particular lengths of the I improved structure may be formed as shown. in Figure 5 with lips 14 that may be produced in a cutting operation after the brush strip has passed beyond the rolls 15-16, this cutting being accomplished as by means of cutters 17 whereby a continuously built up length.

of the brush structure may be separated into pieces of any desired lengths, and in which action of the cutters the sides of the channel strip are compressed or pinched inwardly toward the core strip, thereby'forming the lips 14 that provide an effective enclosure so that the bristles will not be released at the ends of the channels.

My improved brush structure has now been described in some of its preferred forms which possess many advantages as a desirable structure, and which are particularly adapted to facilitate the operation of economical brush manufacture, but Idesire to.

have it understood that the structure shown is only illustrative and that the invention may be carried out by such other means and applied to such uses other than those above set out as fall within the scope of the appended claims. i

I claim 4 1. A brush structure comprising a sheet metal channel strip, a core strip separately formed from the channel strip and-having a beaded edge spaced between the side edges of the channel strip, bristles substantially filling the channel strip and arranged on opposite sides of the core strip and spacing its beaded edge from said side edges, the sides of said channel strip beingpermanently set under pressure to bind-the bristles against said core strip whereby the beaded edge of the latter spreads the bristles bound by'the channel strip.

2. A brush structure comprising a sheet metal channelstrip formed with a constricted neck having an enlarged throat therein, a core strip, bristles folded. around the core strip and substantially filling the channel,.-

the permanent set of the channel strip propressure along said constricted neck portion of said channel section with one enlarged edge portion ofthe core strip arranged out v bristles in two distlnct courses separated by wardlyand the other inwardly of the neck portion in the channel strip.

4. A brush structure comprisin a channel strip of sheet metal, bristles folded lengthwise and substantially fillin said channel,

a core strip located in the ciannel between the folds of the bristles to divide said folds and having side faces to cooperate with the side faces of the channel section, said channel section being permanently set to hold the dividing the folds of the bristles, said separate strip being formed to provide two distinct passages at the'mouth of the channel strip and between the lips thereof for the bristle extensions from said channel and to project said bristles in fan shape from the channel. 7

6. A brush structure comprising a channel strip of sheet metal, the cross section of the channel presenting a constricted pressure neck, a separate core strip of sheet metal in said channel strip, the cross section of the core strip presenting a rounded enlargement at each end joined by a thin web, bristles folded around the core section and filling said'channel with the web of the core section located in the constricted neck of the channel, said channel strip having its sides permanently set under .pressure against the resiliency of the bristles to hold the parts to ether.

A brush structure including a channel strip having a channel, bristles projectin outwardly in two divided masses from sai channel, and a member located between the two masses of said bristles and having a spreadin enlargement beyond the channel strip an also a positioning enlargement to retain the member in place between said folds.

8. A brush structure includin a channel strip having a channel, bristles olded withm the channel and projecting outwardly therefrom, and a member located within the folds of said bristles to separatethem with in said channel and forme beyond the chanbristles and the core strip to retain them in place. a

10. A brush structure including a channel strip, bristles folded within and projecting' from the channel of said strip, and a core strip having edge enlargements positioned within the folds of said bristles and located with one ed e holding the bristles within the channel am? with another edge located outwardly of the channel to spread the bristles laterally after leaving the stri 11. A brush structure inclu ing a channel strip, bristles folded within and projecting from the channel of said strip, and a transversely elongated core stri having its inner edge enlarged and positioned within the folds of said bristles, the channel strip outwardly of said enlarged edge being constricted to prevent withdrawal of the bristles and the core strip. 4

12. A brush structure comprising a channel strip, bristles folded within and substantially filling the channel, and a core located within the channel inside of the bristle mass and between thefolds of said bristles said bristles being held in the strip by the clamping pressure imposed by the ristle mass between thepermanently set and self retaining sides of the channel and the core, said core being thickened at its-outer edge and extending beyond the sides of the channel to spread the bristles beyond the channel.

JOHN J. THACHER.

nel strip to spread the bristles-beyond said 9. brush structure comprising a sheet metal channel strip formed with'a constricted neck and separated lips, a core strip extending outwardly between said hps, and birstles folded about the core strip within said channel and having their folds sepaj rated by said core strip, the width of said neck being less than the combined thickness vof the portions of the bristles at the'fold and the core strip arranged therein whereby constant pressure is maintained upon the

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