Improvements relating to the Manufacture of Brushes.
Year: 1895

page_text: Date of Application, 28th May, 1895--Accepted, 13th July, 1895
[Communicated from abroad by EMMA MORRISON, of 674 Third Avenue,,
Lansingburg, New York, United States of America, Matron.]
Improvements relating to the Manufacture of Brushes.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agente, 45 Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
.
This invention relates to the manufacture of brushes and is illustrated in the
accompanying drawings in which
Fig. 1 of the drawings is a face view of a finished brush. Fig. 2 is a vertical
longitudinal section of the same taken on the broken line 2-2, in Fig. 1, the
relative position of the die-mold sections being indicated by dotted lines.
Fig. 3 is a face view of a recessed back-blank made of wood, without the bristle-
supporting block.
Fig. 4 is a longitudinal vertical section of the same taken on the broken line 4-4,
in Fig. 3.
Fig. 5 is a vertical cross-section of one of the die-mold sections, the ring for
molding a plastic bristle-supporting block, and a molded block with bristles.
Fig. 6 is a top plan view of the block-molding ring detached.
Fig. 7 is a vertical cross-section of both die-mold sections inclosing a recessed.
wooden back-blauk, having a molded compressible bristle-block within the back-
recess.
The object of my invention is to secure a compressible bristle-supporting block,
molded from plastic material, in an undercut recess in the face of a partially
formed back-blank of wood, by compression in suitable die-mold sections, and
at the same time impart to the back-blank and block the desired form for a
brush.
The mold-sections may be similar to those employed for making brushes in which
the back and handle are made of plastic material.
In the manufacture of my improved brush, I insert the bristles in the bristle-
apertures or recesses in one section A of the mold, forming the bristle-tufts B
which project up above the molding surface that forms the face of the bristle-
block.
I then place the molding-ring B¹ upon the mold-section so as to inclose within
the ring the projecting bristles and pour or pack around the bristles plastic
material, which will afterwards harden and support the bristles, until the space
inclosed by the ring is filled thereby producing a molded bristle-supporting
block C.
When the plastic material has sufficiently hardened I remove the molding ring
and substitute in its place the back-blank D having in its face a recess D' of
a size and form to receive and approximately fit the bristle-block, as shown in
Fig. 7.
The peripheral edges of the molded block are slightly beveled so that the
block tapers outwardly from its supporting mold-section, the molding-ring being

page_text: Correspon
block.
that it may be easily withdrawn from the
The recess walls of the back-blank are beveled in the opposite direction, or
undercut, as shown at D' whereby the block will be firmly secured to the back if
the block is expanded edgewise to fill the undercut recess.
To produce the desired expansion of the block I then place the other section A¹
of the mold upon the back of the blank and press the sections together in a hydraulic
or other powerful press.
As the mold-sections come together, the bristle-block and back-blank are both
compressed and given form.
The compression of the block makes it thinner and expands it edgewise so that
it tightly fills the entire recess in the finished back D' as seen in Fig. 2.
The blank is also made thinner and made to correspond. in shape to the die-
surfaces of the mold-section or sections which engage it.
When desired, the die-surfaces may be provided with ornamental figures which
will form corresponding ornamental figures upon the finished back.
The back may have any desired general shape, and a handle D' of any desired
form.
Ornamental figures D may be formed by the dies upon the handle part.
When desired, the plastic material forming the bristle-block may be allowed to
harden by cooling before the parts are compressed, and the exposed surfaces which
are to be forced into contact with the back softened by heating, thereby insuring
the edgewise expansion necessary to fill the undercut space in the recess without
danger of disturbing the relative position of the bristle tufts located in the hard.
part of the material.
The undercut walls of the recess may be of any known form which will clasp the
edges of the compressed block to prevent its escape.
I have also ascertained that by applying a coat of varnish in any known manner
to the surface of the back-blank and forming the back by compression in a heated
mold, I am able to impart to the figured back a uniformly polished and ornamentally:
finished surface, such as could not be easily attained by any other method on a
carved or figure-molded surface.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. In a brush, the combination with a back having an undercut recess in its
face, of a bristle-supporting block formed of plastic material expanded edgewise
in the recess by pressure, whereby it is secured to the back, substantially as
described.
2. The hereindescribed method of making brushes which consists in compressing
a bristle-supporting block within a recess in the face of a compressible back-blank
and at the same time molding the blank into a brush-back by pressure upon inclosing.
mold-sections.
3. The hereindescribed method of making brushes in a mold which consists in
molding a bristle-supporting block from plastic material around tufts of bristles in
one section of the mold, then forcing the molded bristle-block into an undercut
recess in the face of a compressible back-blank, and at the same time molding the
blank into a brush-back by pressure upon the inclosing mold-sections.
4. The hereindescribed method of making brushes which consists in molding a
bristle-supporting block from plastic material around tufts of bristles in one
section of the mold, allowing the molded material to harden by cooling, and
softening the exposed surfaces of the molded material by heating, and then forcing
the softened portion of the bristle-block into an undercut recess in the face of a
brush-back.
5. The hereindescribed method of polishing and finishing mold-figured surfaces

page_text: which consists in applying to the mold-engaging surface of the blank to be molded
a coating of varnish, and then compressing the blank in a heated mold having a
figured surface.
Dated this 28th day of May 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.