US2293302A - Brush - Google Patents

Description

Aug. 18, 1942. E. c. MORCK 2,293,302

Fiid Jan. 21, 1941 Fin-I- INVENTOR.

ERNST CI MOEC'K I awenw zw ATTORNEY Patented Aug. 18, 1942 x UNITED STATES PATENT OFFICE BRUSH Ernst O. Morck, San Mateo, Calif.

Application January 21, 1941, Serial No. 375,123

3 Claims.

This invention relates to brushes of the type used extensively in the application of calcimines, stucco and like finishes.

One of the problems of this art has been to produce a brush for the purposes specified which will stand up under the hard usages to which.

they are subjected. A desirable characteristic of brushes of this type, and in fact any paint brush, is rigidity of construction. It is necessary and desirable that the handle, brush head holder and bristles remain as a solid, unitary structure so long as the bristles thereof are of a usable length.

It is, therefore, an object of this invention to provide a brush having the requisite rigidity, while at the same time having regard for comparative weight and costs of manufacture.

These, and other objects to become apparent as this specification proceeds, are attained through the provision of a brush having certain readily appreciable points of novelty of construction of the brush head holder and handle connection.

In the drawing forming a part hereof wherein a preferred form of the invention is shown for purposes of example,

Fig. 1 is a vertical transverse'sectional view of a brush embodying my invention,

Fig. 2 is a longitudinal sectional view showing further the detail of brush head holder and handle connection,

Fig. 3 is a perspective view of the brush head holder alone, and

Fig. 4 is a bottom plan view of the brush head holder.

The brush head holder comprises an inverted cup-like rectangular shaped member I0 having end and side walls II and I2, respectively, inclined inwardly from the vertical (see Figs. 1 and 2) to define a restricted mouthed socket for the bristle ends and associated elements about to be described.

A protruding handle socket I3 is arranged medially on the otherwise flat side of the brush head holder I0 and a boss I4 is formed at the juncture of socket I3 and holder II) to define an internal annular seat for a retainer disk or washer I1. As will be noted in Figs. 1 and 2 the handle I5 has the conventional reduced end I6 which is received by the socket l3. The retainer disk is then placed in its annular seat, defined by boss I4. The screw I8 is then inserted through the disk I! and turned home in the end of the handle I5.

It will be obvious from the foregoing that my structure provides an extremely tight and rigid connection between the handle I5 and the brush head holder I0. It is a connection which even if not augmented in any way would reduce the likelihood of the handle becoming loose and wobbly to a desirable minimum. However, the joint thus described is supplemented by the means employed for securing the bristles I9 in brush head holder I 0.

When the handle I5 and holder I0 have been assembled as thus described, I next cover disk I! and the bottom and inner surfaces of the side and end walls II and I2, respectively, with a rubber or rubber composition coating 2 I. As will be noted from Figs. 1 and 2, a certain portion of this coating 2| enters such interstices as there are between the edge of disk I! and its annular seat to firmly bind the two together, as will become more apparent.

Preferably while the coating 2| is in a plastic or semi-plastic state, the rows of bristles I9, the butt ends of which have been impregnated with a composition, are inserted in the cup of holder I 0 and spaced apart by the substantially U- shaped wedges or spacers 20. When spacers 20 have been driven home the elements of the device are completely assembled and the device is then subjected to a vulcanizing process to harden or set, following which the brush is ready for use.

The brush of my invention has been found to possess superior lasting qualities and above all to be of a sufficiently rigid construction to meet the most exacting demands of the art.

The invention claimed is:

1. In combination, a brush head holder having a handle socket protruding therefrom, a boss at the juncture of the brush head holder and the handle socket defining an annular seat within the brush head holder about the socket, a retainer disk in the seat, a handle having an end in the socket, a screw through the retainer disk threadably engaging the handle end in the socket.

2. In combination, a brush head holder having a handle socket protruding, therefrom, a boss at the juncture of the brush head holder and the handle socket defining an annular seat Within the brush head holder about the socket,

a retainer disk in the seat, a handle having an end in the socket, a screw through the retainer disk threadably engaging the handle end in the socket, and a vulcanized rubber composition coating over the face of the retainer disk, the

adjacent area of the inner surface of the brush head holder and the head of the screw.

31 In combination, a brush head holder having a handle socket protruding therefrom, a boss at the juncture of the brush head holder and the handle socket defining an annular seat within the brush head holder about the socket, a retainer disk in the seat, a handle having an end in the socket, a screw through the retainer disk threadably engaging the handle end in the 10 socket, a plurality of tufts of bristles having their butt ends in the brush head holder, wedgelike spacer members disposed between the butt ends of the tufts of bristles in the said brush head holder, and a vulcanized rubber composition binding the retainer disk, the screw, the butt ends of the bristle tufts and the spacer members to the inner surface of the brush head holder.

ERNST C. MORCK.

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