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Oct. 15, 1946.
' ‘ . c. Jo'BsT
‘ Filed May 11, 1944
Patented Oct. 15, 1946
Conrad‘lob‘st, Toledo, Ohio, a‘ssi‘glnor to ‘The Toe
ledo Automatic Brush Machine Company, To
ledo, Ohio, a corporation of Ohio
Application May 11, 1944, Serial No. 535,166
1 Claim. (Cl. 15-190)
The invention ‘relates to means for anchoring
tufts in brush backs and has more particular ap
plication to brush backs formed of molded plastic
material. In the present state of the brush art,
molded synthetic plastics have been extensively
used for the forming of backs and handles of
I0 is a brush back having a series of tuft-receiv
ing bores ll formed therein in the usual man
ner. A tuft of bristles l2 doubled over an anchor
I3 is inserted in the bore by means of the driver
or inserter M of a suitable tuft-setting mecha
nism such as described in my Patent No. 2,084,345.
Theanchor is preferably a rectangular slug of
brushes. The tufts are set in such backs in much
a length substantially the same as the diameter
the same way as in the earlier type of backs
of the bore and of a lesser width. It is severed
formed of other materials. Also it has been the
practice to secure the tufts by staples or other 10 from a strip of relatively thin material in the
same manner as set forth in my prior patent.
metallic anchoring members.
However, instead of using a corrosion-resistant
I have discovered that tufts may be secured
metal alloy as has been done in the past, I use a
within the bores of a plastic brush back by means
plastic material of a type that will soften or even
of an anchor formed of certain types of plastic
materials and that these anchors may be ap 15 melt under the in?uence of the heat generated
by the impact when the tuft is inserted in the
plied by a tuft setting mechanism such as de
brush back.
scribed in my previous Patent No. 2,084,345 of
Thus, as shown in Figure 2, the force of the im
June 22, 1937. The essential features of the mech
pact causes the ends N5 of the anchor to be de
anism shown and described in this patent are,
?rst, that a strip or ribbon is intermittently ad~ 20 formed and to penetrate the side walls of the bore
as indicated at I6, thereby forming a mechanical
vanced to shearing means which severs an anchor
interlock. Moreover, the softening or melting of
length therefrom, after which the severed por
the ends of the anchor results in the formation
tion is moved laterally into the path of a driver
of a bond between the anchor and the brush back,
by which it is driven through the tuft setting
nozzle into a registering bore of the brush back 25 which assists in retaining the anchor in its set
carrying the tuft therewith. While the metallic
position and ?rmly securing the bristle tuft.
While the anchor is in its softened condition
anchor described in my patent is of slightly
during the insertion, the individual bristles of the
greater length than the diameter of the bore so
tuft become embedded in the leading edge ll of
that it forms grooves on diametrically opposite
sides of the latter, I have found that the plas 30 the anchor and to a certain extent in the side
faces 18 of the anchor, thereby forming grooves
tic anchor of the present invention need be no '
ill in the edge and grooves 20 in the side faces.
larger than the hole.
This is diagrammatically illustrated in Figure 5
When the plastic anchor is driven into the
where the grooves are shown on an exaggerated
hole in the brush back, the plastic material of the
anchor softens by means of the heat generated 35 scale.
In the broader phases of my invention, the an
during the impact with the brush back and it is
chor may be made of any non-metallic plastic
deformed into a shape which interlocks with‘ the
material which is capable of being so in?uenced
brush back and forms a bond. therewith, thus
by the impact of the insertion as to form a me
?rmly holding the bristles in the bore.
The invention will be more fully appreciated by 40 chanical interlock or bond with the brush back
to securely hold the tuft in position. More spe
reference to the accompanying drawing, in which
ci?cally, I have found that it is desirable to use
Figure 1 is a cross section through a brush back
a resin which may be identi?ed as a viny1 chlo
showing the bristle tuft and plastic anchor as it
enters the bore;
ride-vinyl acetate copolymer containing 80-95%
Figure 2 is a similar view showing the tuft and 45 vinyl chloride and having an average molecular
weight of 10,000 to 25,000 as determined by the
anchor after it is inserted in the bore;
Staudinger method. As an example of resins'of
Figure 3 is a transverse section on line.3--3 of
this type, reference may be made to U. S. Patent
Figure 2;
No. 1,935,577 and to an article by Curme 8; Doug
Figure 4 is a section on line Il-d of Figure 2;
Figure 5 is a side view of an anchor after in 50 las, published in the October 1936 issue of Indus
trial and Engineering Chemistry.
sertion showing on an exaggerated scale the
The material of the brush back may be any
deformation of the material to conform to the
of the usual types of plastics commonly used
bristles of the tuft;
for this purpose such as Celluloid, cellulose ace
Figure 6 is a section on the line 6-—6 of Figure
55 tate, butyrate, etc.
- 2,409,490
My improved construction of anchoring means
has various advantages. Among these are, ?rst,
While I have disclosed a preferred embodi
ment of the invention, it is to be understood
that it is not limited to the speci?c construction
herein de?ned, but covers various modi?cations
if so desired, it may be made of transparent ma
terial for use in brush backs that are also trans
parent. On the other hand, it may be desired 5 coming within the purview of the appended claim.
to form it of colored material which is visible
What I claim as my invention is:
_ through the transparent back. A very important
In combination with a brush back of a poly
advantage is the interlock which is produced by
merized synthetic plastic material and having a
the lateral expansion of the anchor during the
bore therein and a bristle tuft within said bore,
setting operation. A further advantage is that 10 of an anchor formed of a copolymer of vinyl
the material is not subject to corrosion as is the
chloride and vinyl acetate, said anchor having
case with certain metals from which anchors
the ends thereof laterally expanded to be em
have been formed. An important advantage is » bedded in the walls of said bore and bonded to
that the plastic anchor forms abu?er between
the brush back.
the driver l4 and the bristle tuft, thus prevent 15
ing the injury of the bristles during the setting
of the tuft in the brush back.
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