U.S. patent number 3,696,563 [Application Number 04/870,486] was granted by the patent office on 1972-10-10 for abrasive brush having bristles with fused abrasive globules.
Invention is credited to Steve A. Rands.
United States Patent |
3,696,563 |
Rands |
October 10, 1972 |
ABRASIVE BRUSH HAVING BRISTLES WITH FUSED ABRASIVE GLOBULES
Abstract
The specification discloses an article of manufacture comprising
an abrasive brush and the abrasive bristles comprising same, and a
method for producing or manufacturing same. Each abrasive bristle
is of a resilient type and has a free outer bristle end carrying an
enlarged abrasive globule of relatively fused bonding material and
particulate abrasive material which may be mounted on a bristle end
directly by a fused-in-place junction between the bristle end and
the globule or by auxiliary mounting or attachment means taking the
form of an auxiliary bristle end member having said bonding
material and particulate material fused thereto and with said
auxiliary bristle end member being further provided with attachment
means for attaching same to a corresponding free outer bristle
member end. Said attachment means may comprise brazed junction
means, mechanical engagement means, or any other suitable
attachment means. The specification discloses several methods of
manufacturing the abrasive bristles, and basically said method
comprises applying to the end of a heat-resistant bristle member a
particulate abrasive material and a fusible type of bonding
material (which is either liquefied before such application, during
such application, or subsequent to such application) in one or more
applicatory and subsequent hardening steps until a substantial
deposit of same has been applied to and condensed upon each free
outer bristle member end so treated, to an extent such as to
comprise and define one or more corresponding fused-in-place,
enlarged abrasive globules.
Inventors: |
Rands; Steve A. (Los Angeles,
CA) |
Family
ID: |
25355484 |
Appl.
No.: |
04/870,486 |
Filed: |
October 13, 1969 |
Current U.S.
Class: |
451/466;
15/207.2; 451/536; 15/197 |
Current CPC
Class: |
B24D
18/00 (20130101); B24D 13/10 (20130101) |
Current International
Class: |
B24D
13/00 (20060101); B24D 18/00 (20060101); B24D
13/10 (20060101); B24b 009/02 () |
Field of
Search: |
;51/341,336,404,332
;15/159A,197,198,200 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Whitehead; Harold D.
Claims
I claim:
1. A compliantly mounted abrasive means in the form of a brush
device, comprising: a brush means including a plurality of bristle
members, each having a rear end provided with and carried by a
bristle-member-mounting brush base means, each bristle member being
made of a heat-resistant flexible compliant material and including
a corresponding resiliently deflectable, compliant shaft portion
provided with a corresponding free outer end carrying and
effectively defining an enlarged abrasive globule including a
desired type of outer abrasive coating means comprising a fusible
bonding material and an extremely hard, particulate, abrasive
material fused in place relative to said bonding material, with the
fusible bonding material providing a strong, fused-in-place
junction thereof with respect to the particulate abrasive material
and being provided with bridging, interengaging, and effectively
penetrating means effectively firmly mounting said enlarged
abrasive globule with respect to said bristle member free outer end
in a manner projecting outwardly therefrom, said bridging,
interengaging, and effectively penetrating means for mounting each
such abrasive globule with respect to a corresponding free outer
bristle member end comprising a fused-in-place junction of said
bonding material and the corresponding surface portion of each
corresponding bristle member end positively and firmly fastening
said abrasive outer coating means to said bristle member end in
said manner projecting outwardly therefrom, each bristle member
comprising a plurality of adjacent metal strand portions, together
forming a metallic cable provided with multiple effectively porous,
penetrable junction interface means comprising the surface portions
of the cable having openings between the cable strand portions
extending thereinto and receiving therein portions of said bonding
material when fused thereon whereby to maximize the junction
strength and the bridging, interengaging, and effectively
penetrating relationship of said bonding material relative to the
rest of the abrasive globule and the effectively porous, penetrable
junction interface means of said bristle member free outer end.
2. A device as defined in claim 1, wherein said particulate
abrasive material and said bonding material are effectively
intermixed and fused to each other whereby to cause said
particulate abrasive material to be firmly held in place and
dispersed throughout said bonding material of each of said abrasive
globules.
3. A device as defined in claim 1, wherein said abrasive outer
coating means comprises an effective outer layer of said
particulate abrasive material and an effective inner layer of said
bonding material providing said strong junction of said particulate
abrasive material with respect to said bonding material whereby to
firmly fasten them together.
4. A device as defined in claim 1, wherein said bonding material
comprises a braze-weld-type of metallic material capable of forming
a braze-weld-type of junction with the particulate abrasive
material when fused thereto.
5. A device as defined in claim 1, wherein the metallic material of
which each bristle member is made comprises a metallic, stainless
steel cable and wherein said bonding material comprises a
braze-weld-type of metallic material capable of forming a
braze-weld-type of junction with the particulate abrasive material
when fused thereto, each bristle member having a major portion of
the length thereof positioned inwardly of the abrasive globule at
the free outer end thereof substantially free of said particulate
abrasive material and said braze-weld-type of metallic bonding
material whereby to have substantially unaltered lateral compliance
characteristics and whereby to position substantially all of said
particulate abrasive material in said abrasive globules carried at
the free outer ends of said compliant bristle members in optimum
locations for abrading contact with a surface of a workpiece.
6. A device as defined in claim 1, wherein said bristle-mounting
brush base means comprises a receiving cup member having an open
forward end and a closed rear end provided with a longitudinally
centrally axially positioned rearwardly projecting tool-engageable
shaft portion.
7. A device as defined in claim 1, wherein said bristle-mounting
brush base means comprises a receiving cup member having an open
forward end and a closed rear end provided with a longitudinally
centrally axially positioned rearwardly projecting tool-engageable
shaft portion, said receiving cup member receiving, engaging, and
firmly holding therein rear ends of corresponding ones of said
plurality of bristle members.
8. A device as defined in claim 1, wherein said bristle-mounting
brush base means comprises a receiving cup member having an open
forward end and a closed rear end provided with a longitudinally
centrally axially positioned rearwardly projecting tool-engageable
shaft portion, said receiving cup member receiving, engaging, and
firmly holding therein rear ends of corresponding ones of said
plurality of bristle members and being provided with effectively
adhesive potting means initially comprising an effectively
liquefied material at the time of mounting thereof and subsequently
comprising an effectively hard retaining potting material.
9. A device as defined in claim 1, wherein said plurality of metal
strand portions comprises an assembly of twisted, stainless steel
wire portions, each in turn comprising a plurality of twisted,
stainless steel, individual wire strands and together causing said
cable to comprise a stainless steel cable having said effectively
porous, penetrable junction interface means formed by the openings
between the stainless steel wire portions and stainless steel wire
strands of a corresponding free bristle end; said bristle-mounting
brush base means comprising a substantially cylindrically shaped
receiving cup member having an open forward end and a closed rear
end provided with a longitudinally centrally axially positioned
rearwardly projecting tool-engageable shaft portion, said receiving
cup member receiving, engaging, and firmly holding therein rear
ends of corresponding ones of said plurality of stainless steel
cable bristle members and being provided with effectively adhesive
potting means initially comprising an effectively liquefied
material at the time of mounting thereof and subsequently
comprising an effectively hard retaining potting material taking
the form of a synthetic plastic resin of the epoxy resin type.
10. A device as defined in claim 1, wherein said brush means
comprises an end brush with said plurality of bristle members being
similarly longitudinally but divergingly directed and being
laterally and inwardly resiliently deflectable.
Description
Generally speaking, the present invention comprises an abrasive
brush having a plurality of resiliently deflectable bristle
members, at least certain of which have mounted at free outer
bristle member ends thereof corresponding enlarged abrasive
globules of relatively fused bonding material and particulate
abrasive material, with said enlarged abrasive globules being
effectively provided with means for mounting each such abrasive
globule with respect to a corresponding free outer bristle member
end and comprising, in one form of the invention, a fused-in-place
junction of said bonding material and the corresponding surface
portion of the corresponding bristle member end whereby to
positively and firmly fasten each such enlarged abrasive globule
made up of such an abrasive outer coating means to the
corresponding bristle member end in a manner such as to virtually
entirely prevent chipping and flaking away, or other types of
detachment, of all or portions of the abrasive globule from the
bristle member end during even very heavy abrasive use of the brush
for abrading a workpiece. In another form of the invention, the
means for mounting each such abrasive globule with respect to a
corresponding free outer bristle member end comprises an auxiliary
bristle end member for each such bristle member end having said
outer coating means comprising said fusible bonding material and
said particulate abrasive material fused in place with respect to
the auxiliary bristle end member which is then effectively provided
with attachment means for attaching said auxiliary bristle end
member to a corresponding free outer bristle member end. Such
attachment means may take the form of brazed, welded, soldered, or
other adhesive or cohesive junction means, or may take the form of
various types of mechanical attachment or engagement means. In any
case, the effective end result is to provide a brush having a
plurality of resilient bristles each firmly carrying at an outer
end thereof such an enlarged abrasive globule having maximum
abrading efficiency by reason of the provision of the maximum
quantity of particulate abrasive material at the precise location
where it is needed for abrading purposes. In one preferred form,
the abrasive brush may have the bristle members arranged in a
generally similar, longitudinally divergingly directed relationship
with respect to a brush-holding base means and a longitudinal axis
of the complete device so as to define and comprise what might be
termed an end brush or a flare brush of an effectively resiliently
expansible type capable of abrading inside, concave workpiece
surfaces of various different diameters. However, it should be
clearly noted that this is merely exemplary of one advantageous
form of the invention, and it should be understood that the
invention is not limited to this particular type of brush but may
be employed in a greater variety of different types of brushes and,
indeed, wherever the mounting of one or more such abrasive bristle
members is desired.
It should also be noted that, in one preferred form of the
invention, the bristle members are preferably made of resilient,
metallic, heat-resistant material which, in certain forms, may be
of a composite form such as is commonly known as metallic cable,
which usually comprises a plurality of twisted metallic wire
portions, with each of the wire portions, in certain forms thereof,
in turn comprising a plurality of twisted, metallic, individual
wire strand portions. However, it should be understood that the
invention is not specifically so limited and that various different
types of metallic bristle construction may be employed other than
multiple-strand cable constructions of the type just referred to
and that, indeed, in certain forms of the invention it is even
possible that the bristle members may be made of a heat-resistant,
resilient material other than metal.
However, for purposes of illustration only, I have elected to
primarily describe and illustrate the above-mentioned end brush or
flare brush form of the invention in a version thereof wherein each
of the bristle members is made of the multi-twisted-strand,
metallic cable form referred to above and which, in one exemplary
form, may be made of stainless steel which is corrosion-resistant,
relatively heat-resistance, and has a desired degree of lateral
resiliency (or, conversely, compliancy) whereby to be well adapted
for use in the above-mentioned exemplary type of end brush or flare
brush which is of the above-mentioned expansible, variable-diameter
type and which furthermore is commercially available at moderate
cost. While this form of the inventions has been chosen for the
purpose of describing the invention in detail hereinafter, it
should be clearly understood that it is exemplary only and is not
to be construed as specifically limiting the invention.
In one preferred form of the invention, the plurality of bristle
members have corresponding rear end portions mounted within a
receiving cup member which firmly holds same and which, in one
version, may have the bristle member rear ends firmly potted in
place with a potting compound or other hardened matrix material to
enhance the engagement thereof.
It should be clearly understood in the remainder of this
application that reference to either the article-of-manufacture
aspect of the invention or to the method aspect of the invention is
to be broadly construed and interpreted as being applicable to, and
providing a corresponding disclosure of, the other method or
article-of-manufacture aspect thereof, respectively.
It should be noted in connection with the use of the expression
"two-phase" with reference to the material in the abrasive
globules, that this refers primarily to the outer coating means and
the free outer end of the bristle member itself in one aspect and,
in another aspect, refers to at least two of the major different
constituents of the outer coating material itself and, thus, it can
be seen that in actuality, if all of these materials are taken into
account, more than two materials are involved in certain forms of
the invention, and the composite is actually a multi-phase
material. Therefore, the expression, "two-phase" material as used
herein is intended to be broadly interpreted in the light of the
foregoing statement as inclusive of any of the meanings or material
combinations referred to herein. This is also true of the
expression, "multiphase."
It will be understood from the foregoing summary of the invention
that the improved design of the present invention will function as
a very effective and size-adjustable, resiliently deflectable
grinding brush capable of operating for a very substantial period
of time by reason of the fact that a very large amount of the
extremely hard, particulate abrasive material is carried at the
free outer bristle member ends or bristle member tip ends in a
manner adapted to attain full abrasive efficiency by reason of the
fact that the metallic bonding material is softer than the
particulate abrasive material (and in certain forms of the
invention may be softer than the material of a workpiece which is
to be abraded, although not specifically so limited) so that the
bonding material will be abraded away somewhat more rapidly than
the particulate abrasive material, which will thus always cause the
harder particulate, abrasive material to project outwardly from the
bonding material and to thus continually outwardly present a very
effective abrasive surface adapted to contact the adjacent surface
of a workpiece which is to be abraded--this latter function
actually occurring during abrading operation of the device.
With the above points in mind, it is an object of the present
invention to provide an improved abrasive brush having abrasively
tipped bristles of the type referred to herein, which is adaptable
for use as a resiliently deflectable grinding, honing, and/or
polishing brush and which, in one exemplary but
non-specifically-limiting form, may comprise an end or flare brush
having bristle means of a metallic (preferably stainless steel
cable) type provided with and carrying in a fused-in-place manner a
plurality of enlarged abrasive globules.
It is a further object of the present invention to provide a novel
abrasively tipped bristle construction and method of manufacturing
same, having any or all of the advantages referred to herein and
including any or all of the features referred to herein,
generically and/or specifically and individually or in combination,
and which is of relatively simple, inexpensive, easily manufactured
construction, both as to initial capital costs (including tooling
costs, etc.) and as to the cost of production per item or unit,
such as to facilitate widespread, large-scale manufacturing, sale,
and use of the invention for the purposes outlined herein or for
any substantial functional equivalents thereof. This is also true
with respect to the method aspect of the invention.
Further objects are implicit in the detailed description which
follows hereinafter (which is to be considered as exemplary of, but
not specifically limiting, the present invention), and said objects
will be apparent to persons skilled in the art after a careful
study of the detailed description which follows hereinafter, and
all such implicit objects are intended to be included and
comprehended herein as fully as if particularly defined and pointed
out herein.
For the purpose of clarifying the nature of the present invention,
several exemplary embodiments of the article-of-manufacture aspect
of the invention and several exemplary combinations of method steps
for producing same are illustrated in the hereinbelow-described
figures of the accompanying drawings and are described in detail
hereinafter.
FIG. 1 is a side elevational view of one exemplary embodiment of
the invention wherein the device takes the form of what might be
termed an end brush having a plurality of laterally deflectable
bristle members made of twisted wire portions and twisted
individual wire strands, and normally positioned in similarly
longitudinally divergingly directed relationship with respect to
the bristle-mounting brush base means mounting the rear ends of the
bristle members. Each of the bristle members is shown as carrying
on the free outer end thereof a fused-in-place sintered-on,
enlarged abrasive globule of the novel type provided by the present
invention.
FIG. 2 is a front elevational view of the exemplary form of the
invention shown in FIG. 1 and shows each of the bristle members in
the forwardly outwardly diverging relationship referred to in the
description of FIG. 1.
FIG. 3 is a front elevational view generally similar to FIG. 2 but
shows each of the bristle members in inwardly laterally deflected
relationship so that all of the abrasive globules fused in place or
sintered on the free outer ends of the bristle members are in
closely adjacent relationship. It should be understood that it is
necessary for some surrounding structure to restrain the normally
diverging free outer bristle ends and the abrasive globules
fused-in-place and sintered on said free bristle ends in order to
cause them to assume the inwardly laterally deflected relationship
shown in FIG. 3 and thus a surrounding flue pipe or tubing is also
shown in cross section in this view and functions for this
restraining purpose--it being understood that a variety of
different sizes of tubing or flue pipes having different interior
diameters may be placed in a relationship such as is shown in FIG.
3 for interior abrading, honing, or polishing thereof by the
fused-in-place, sintered-on, enlarged abrasive globules of the end
brush when it is power rotated.
FIG. 4 is a cross-sectional view taken substantially on the plane
and in the direction indicated by the arrows 4--4 of FIG. 1 and
clearly illustrates the interior cross-sectional construction of
the exemplary bristle mounting brush base means.
FIG. 5 is an enlarged, fragmentary view taken substantially along
the plane and in the direction indicated by the arrows 5--5 of FIG.
1 and also of FIG. 4, and further illustrates the detail of the
detailed construction of the exemplary bristle mounting brush base
means. This view also shows fragmentarily in phantom a forward
collet or chuck portion of a power driving unit adapted to engage
the rearwardly positioned tool-engageable shaft portion of the
bristle-mounting brush base means, it being understood that said
fragmentarily shown chuck or collet may be a portion of any type of
power driving unit, such as that provided as a major portion of a
conventional electric hand drill, for example, although not
specifically so limited.
FIG. 6 is a greatly enlarged, fragmentary, perspective, partly
broken away and partly sectional view of an exemplary one of the
forward end portions of any of the bristle members and including
the free outer or tipe end thereof and the fused-in-place and
sintered-on, enlarged, abrasive globule carried thereby. This view
clearly illustrates the exemplary construction of the bristle
member of the exemplary first form of the invention and the
construction of the exemplary fused-in-place, sintered-on, abrasive
globule and also the strong mechanical junction therebetween
provided by the novel construction and novel method of the present
invention.
FIG. 7 is a reduced-size view of a somewhat diagrammatic and
schematic nature illustrating one exemplary method for producing
the type of fused-in-place, sintered-on, enlarged abrasive globule
illustrated fragmentarily in FIG. 6, and shown in multiple form in
other figures as being carried by the free outer bristle ends of
the plurality of bristle members. In this view, certain portions of
the powder torch or flame-spraying apparatus are shown partially
broken away in order to clarify important portions of the exemplary
method of the present invention illustrated in FIG. 7.
FIG. 8 is a fragmentary, somewhat diagrammatic and schematic view,
similar to at least a portion of FIG. 7, but illustrates a slight
modification of the exemplary method for producing the article of
manufacture of the present invention as shown somewhat
diagrammatically and schematically in FIG. 7. The difference lies
in the different type and location of introduction of the powdered
applicatory material which is to form the fused-in-place,
sintered-on, enlarged, abrasive globule than is disclosed somewhat
diagrammatically and schematically in the FIG. 7 showing of the
first method of the present invention.
FIG. 9 is a view of a somewhat diagrammatic and schematic nature
similar in certain respects to FIG. 7, but illustrates a slightly
different method for producing each of the fused-in-place,
sintered-on, enlarged, abrasive globules which results in a final
enlarged abrasive globule of somewhat different interior
construction, as illustrated fragmentarily in partially broken away
and sectional form in FIG. 10.
FIG. 10 is an enlarged, fragmentary, partially broken away and
partially sectional view, similar to FIG. 6, but illustrates a very
slightly modified form of the fused-in-place, enlarged, abrasive
globule of the present invention.
FIG. 11 is a view similar in many respects to FIG. 6, but
illustrates a very slight modification of the invention wherein the
bristle member shown fragmentarily is of different construction
from the exemplary first form of the invention as best shown in
FIG. 6.
FIG. 12 is a somewhat diagrammatic view illustrating a modified
method of fusing in place the outer coating means comprising the
particulate abrasive material and fusible bonding material so as to
form the enlarged abrasive globule. This view illustrating this
method step is shown with respect to one bristle only for purposes
of simplification and illustrates the process in a form wherein the
particulate abrasive material is contained in the melted bonding
material so that the application thereof to the bristle member end
can be accomplished by puddle dipping either in a single step or in
multiple steps.
FIG. 13 is a view very similar to FIG. 12 but illustrates a slight
modification wherein the material applied by puddle dipping
comprises the melted bonding material only, it being understood
that immediately after removal of the bristle member end from the
crucible containing the melted bonding material, it will be
inserted into a container carrying the particulate abrasive
material as illustrated in FIG. 14. This may be done as many times
as desired in order to build up the coating means into an enlarged
abrasive globule of any desired size.
FIG. 14 is a fragmentary, somewhat diagrammatic view illustrating
the step following that shown in FIG. 13.
FIG. 15 is a view illustrating the initial step in another method
which comprises the initial heating of the bristle member end
followed by the step illustrated in FIG. 16.
FIG. 16 is a fragmentary, somewhat diagrammatic view illustrating
the next step following that shown in FIG. 15, comprising the
insertion of the extremely hot bristle member end into the coating
means in powdered metal form and comprising both the particulate
abrasive material and the fusible bonding material.
FIG. 17 illustrates fragmentarily the next step following that
shown in FIG. 16--it being understood that the series of steps
shown in FIGS. 15 through 17 may be repeated as many times as
desired in order to build up an enlarged abrasive globule of any
desired size.
FIG. 18 is a fragmentary, sectional view similar in certain
respects to FIG. 6, but illustrates a further modification of the
invention wherein the abrasive globule is fused in place by any of
the various methods of the present invention on the surface of an
auxiliary bristle end member which then is attached onto a main
bristle member end by any suitable means, which is shown in this
example as comprising a brazed junction, although the invention is
not specifically so limited.
FIG. 19 is a fragmentary view similar to FIG. 18 but illustrates a
different type of attachment means for the auxiliary bristle end
member.
Generally speaking, the exemplary first form of the invention
illustrated comprises what might be termed an end brush means or
device, such as is generally designated by the reference numeral
20, which includes a plurality of similarly longitudinally and
normally divergingly directed, laterally resiliently deflectable,
normally metallic bristle members, each of which is generally
designated by the reference numeral 22 and each having a rear end
24 provided with and carried by a bristle-member-mounting brush
base means, such as is generally designated by the reference
numeral 26. The mounting of the rear ends 24 of the exemplary five
bristle members 22 by the bristle-member-mounting brush base means
26, in the exemplary first form of the invention illustrated, is
such that all portions of each of said bristle members 22 forwardly
of the mounted rear end 24 thereof are unsupported and free for
movement--the only support being provided by the fixedly mounted
rear end 24 thereof. Each of the forwardly extending bristle member
shaft portions is designated by the reference numeral 28 and,
initially before the mounting of the abrasive globules referred to
hereinafter, terminates in a free outer end or tip end 30 such as
can be seen in phantom in FIG. 1.
Each of the three outer bristle ends or tip ends 30 is provided
with a fused-in-place, sintered-on, enlarged abrasive globule, such
as is generally designated by the reference numeral 32. In the
exemplary form of the invention illustrated, each of the
fused-in-place enlarged abrasive globule 32 comprises a desired
type of outer abrasive coating means, such as is generally
designated by the reference numeral 34, firmly mechanically joined
to and mounted on the free outer bristle end 30 in a manner which
positively prevents inadvertent or undesired separation of the
abrasive outer coating means 34 of the abrasive globule 32 from the
free outer bristle end 30, such as by flaking away, chipping away,
or otherwise becoming separated therefrom as a result of mechanical
impact, vibration, or other stresses or shocks, either mechanically
produced or thermally produced, or any combination thereof.
In the exemplary first form of the invention illustrated, the outer
abrasive coating means 34 of each of the enlarged abrasive globules
32 comprises two major constituents or components, a first one of
which is particulate, abrasive material of an extremely hard type,
such as particles of tungsten carbide or the like, and a metallic
bonding material which usually has a lower melting temperature than
the particulate abrasive material and is not as hard and which is
adapted to effectively hold the particles of the abrasive material
in a surrounding relationship with respect to the corresponding
free outer bristle end 30 and to function as a joining material
adapted to provide a very strong mechanical junction of the various
particles of abrasive material with respect to each other and of
all of the particles of abrasive material with respect to the
corresponding free outer bristle end 30. The junction is usually of
what might be termed a fused-in-place or sintered-on type,
involving the melting, or partial melting, of the metallic bonding
material while the particulate abrasive material remains in solid,
unmelted condition, and the flowing of the inner portion of the
melted, or partially melted, metallic bonding material into
engagement with the effectively porous outer surface of the free
outer bristle end 30 and the subsequent condensing and hardening of
the previously liquified, melted, or partially melted metallic
bonding material so that upon hardening, it provides a very strong
and virtually non-removable junction of the type best illustrated
at the junction interface designated by the reference numeral 36 in
FIG. 6.
In the exemplary first form of the invention illustrated, the
particulate abrasive material is designated by the reference
numeral 38 and, as previously mentioned, may comprise tungsten
carbide or particles of any other suitable extremely hard abrasive
material, and also in the exemplary first form of the invention
illustrated, the above-mentioned metallic bonding material may
comprise a nickel-base alloy or any other substantial functional
equivalent, designated by the reference numeral 40, and having a
lower melting temperature than the tungsten carbide particles of
abrasive material 38 and also being softer than the extremely hard
particles of abrasive material 38. However, such a nickel-base
alloy metallic bonding material 40 may have a sufficiently high
melting temperature and may have sufficient hardness as to provide
a very strong, hard, wear-resistant and heat-resistant
characteristic to the portions of the complete abrasive globule 32
formed thereby so as to maximize the strength of the junction
interface 36 and further minimize any likelihood of the abrasive
outer coating means 34 of the abrasive globule 32 to flake or chip
away as a result of shock mechanically produced, or of thermally
produced stresses, etc. In other words, this type of metallic
bonding material provides a very long lasting abrasive globule 32
and is particularly advantageous, although it should be noted that
the invention is not specifically limited thereto, and various
other functional equivalents may be employed in lieu thereof. This
is also true with respect to the particulate abrasive material
38.
It should be noted that the metallic bonding material 40 referred
to above may be said to comprise a braze-weld type of metallic
bonding material, since its function when heated to a sufficiently
high temperature, as will be described in greater detail
hereinafter, is to effectively provide a brazed or welded junction
at the junction interface 36 between the metallic bonding material
40 and the metallic free outer bristle end 30, which is of
dissimilar metal. It is also true that a similar type junction
effectively occurs between the melted, or partially melted, and
subsequently condensed and/or hardened metallic bonding material 40
and each of the particles of tungsten carbide abrasive material 38
and, thus, the description of the metallic bonding material 40 as
being a braze-weld type of metallic bonding material is believed to
be functionally correct and will be employed at various locations
throughout this application in describing or referring to said
metallic bonding material 40.
It should be noted that, as pointed out hereinbefore, each of the
bristle members 22 is made of metallic material and, therefore,
each free outer bristle end 30 is, for course, of this same
metallic material and is adapted to provide the type of braze-weld
or fused-in-place, sintered-on junction interface 36 between the
metallic material of the free outer bristle end 30 and the
braze-weld type of metallic bonding material 40 as described
hereinbefore. In the first example illustrated, the metallic
material of each of the bristle members 22 may comprise stainless
steel which has certain advantages in that it is substantially
non-corrodible, in mechanically strong and capable of providing the
desired degree of lateral resiliency to each of the bristle members
22, and is relatively resistant to the effect of heat and,
therefore, is substantially unaffected by the heat applied to the
corresponding free outer bristle end 30 for a very short time when
the fused-in-place, sintered-on, enlarged, abrasive globule 32 is
effectively mounted thereon by flame-spraying or flame-coating, as
is best illustrated in FIG. 7 and as will be described in greater
detail hereinafter.
Also, it should be noted that, in the exemplary first form of the
invention illustrated, each of the stainless steel bristle members
22 comprises a stainless steel cable having a plurality of twisted
stainless steel wire portions 22P, each of which, in turn,
comprises a plurality of twisted stainless steel individual wire
strands 22S. Such stainless steel cable provides a very effective
material for each of the bristle members 22, since it is
commercially available at moderate cost and has the desired
mechanical, thermal, and chemical properties for the purposes of
the bristle members 22.
Additionally, it should be noted that the free outer end 30 of each
such stainless steel cable type of bristle member 22 has a very
porous, roughened, penetrable surface, and thus allows the melted
or partially melted braze-weld type of metallic bonding material 40
of the outer coating means 34 of the abrasive globule 32 to
penetrate the surface of the free outer bristle end 30 to a
substantial degree and thus form the corresponding junction
interface 36 in a manner having a substantial thickness or depth,
which greatly enhances the mechanical and thermal properties of
said junction interface 36 and correspondingly of the firm and
substantially non-removable mounting of the entire abrasive globule
32 on the free, outer bristle end 30 of the stainless steel cable
type of bristle member 22. Indeed, said mounting is so mechanically
and thermally superior as to make it virtually impossible for the
abrasive globule 32 to flake or chip away under virtually any
condition of normal operating use even when subjected to very high
speed, high impact, and high vibration operating conditions and/or
when subjected to very high temperature operating conditions. This
feature is superior to the mounting of any type of abrasive means
on any type of bristle of any prior art abrasive brush known to me
and provides a major advantage of the present invention.
In the exemplary first form of the invention illustrated, the
previously generically mentioned bristle-member-mounting brush base
means, generally designated at 26, comprises a receiving cup member
42 which is usually substantially cylindrically shaped, although
not specifically so limited in all forms of the invention, which
has an open forward end 44 and a closed rear end 46 which is
provided with a tool-engageable portion which, in the example
illustrated, comprises a centrally axially positioned, rearwardly
projecting, tool-engageable shaft portion 48 which is adapted to be
received within a chuck or collet, such as is shown fragmentarily
in phantom at 50 in FIG. 5, of any type of power driving unit such
as that provided as a major portion of a conventional electric hand
drill, for example, although not specifically so limited. The
arrangement is such that the tool-engagement shaft portion 48
allows the entire end brush 20 to be power rotated for effective
abrading, grinding, honing, or polishing operation, usually within
a tubular or cylindrical hole in a work piece, such as the hole in
tubing, flue pipe, or the like, although not specifically so
limited. One such work piece is generally designated by the
reference numeral 52 in FIG. 3 and is merely representative of any
of a variety of different types of work pieces.
In the exemplary first form of the invention illustrated, the
receiving cup member 42 receives, engages, and firmly holds therein
the rear ends 24 of the bristle members 22. This may be done
mechanically, such as by press-fit engagement therein, by various
clamping structures or devices, or may be done by adhesive or
cohesive junction means adapted to bond or embed the rear ends 24
of the bristle members 22 within the recess formed within the
receiving cup member 42. While any of these arrangements, or any
other functional equivalents, may be employed for firmly fastening
the rear bristle ends 24 within the receiving cup member 42, the
arrangement shown in the exemplary first form of the invention as
best seen in FIGS. 4 and 5 comprises a combination of a press-fit
mechanical engagement and the provision of adhesive bonding means
54 comprising an initially effectively liquefied material at the
time of mounting of the rear bristle ends 24 therein and adapted to
subsequently harden into an effectively hard retaining potting
material 54 as clearly shown in FIGS. 4 and 5. The hardening may be
of a thermosetting type induced by catalytic action or by curing at
an elevated temperature, or both, and, in one form of the
invention, may comprise a synthetic plastic resin of the so-called
epoxy resin type, although not specifically so limited.
It should be noted that the enlarged abrasive globule 32 carried by
the free outer bristle end 30 of each metallic bristle member 22
may be said to comprise a two-phase or multi-phase material
(usually a largely metallic material) which effectively alters the
physical characteristics of the free outer bristle end 30, and it
should further be noted that the coating means 34, comprising the
abrasive globule 32, does not extend along the rest of the
laterally resilient stainless steel cable shaft portion 28 of the
corresponding bristle member 22 and thus does not alter the lateral
resiliency or compliancy characteristics thereof in any manner
whatsoever. This is important because it is desired to have the
shaft portion 28 retain certain resiliency and compliancy
characteristics which provide for the normal diverging thereof in a
manner such as is clearly shown in FIGS. 1 and 2 and yet which
allows the bristle members to be laterally inwardly resiliently
deflected into a configuration such as is illustrated in FIG. 3,
and also allows the bristle members to assume any configuration
therebetween as determined by the outer surrounding restraint, such
as the flue pipe shown at 52 in FIG. 3, for example. This makes it
possible for the end brush 20 to effectively abrade, grind, hone,
or polish an inside cylindrical surface of a number of different
diamters of pipe, tubing or the like, without changing the end
brush size.
In other words, one end brush can operate effectively for removing
scale or other deposits from the interior surface of a flue pipe or
the like, such as that shown at 52 in FIG. 3 when it is of an
extremely small diameter, and can function just as effectively with
any size of flue pipe ranging between that shown in FIG. 3 and that
shown fragmentarily in phantom at 52' in FIG. 1. This portion of
the total range of permissible diameter variation in the flue pipe,
or the like, which is to have its inner surface abraded (usually
for cleaning purposes) results from the lateral resiliency and
compliancy characteristics of the uncoated bristle shaft portions
28. However, this feature is even further enhanced and increased by
reason of the fact that the end brush 20 is adapted to be
power-rotated by power-driving means engaged with the
tool-engageable portion 48 in a manner such as has been previously
described herein, and this will effectively produce substantial
centrifugal force on each of the enlarged abrasive globules 32,
which have substantial mass, and will cause them to move even
further outwardly toward a position such as that shown in dotted
lines at 32" in FIGS. 1 and 2 under the action of such centrifugal
force. This is permitted by reason of the lateral resiliency and
compliancy characteristics of the shaft portion 28 of each of the
bristle members 22, and thus it can be seen that the lateral
resiliency and compliancy characteristics of the uncoated shaft
portion 28 of each of the bristle members 22 is quite important
since it makes possible the very wide range of pipe or tubing
sizes, or diameters of other cylindrical work piece surfaces, which
can be effectively abraded by one single size of end brush.
Additionally, in connection with the above, it should be noted that
the dotted line outside position of the bristle members 22 shown in
FIGS. 1 and 2 at 32" can be increased to even a greater diameter by
increasing the rate of rotation of the entire end brush 20.
One exemplary method for producing the type of abrasively tipped
bristle members of the novel end brush 20 of the first form of the
invention is illustrated somewhat diagrammatically and
schematically in FIG. 7 wherein the plurality of bristle members 22
are shown as having their rear ends 24 or adjacent shaft portions
28 initially clamped or held by a vise-like structure, such as is
generally designated by the reference numeral 56, and which may be
mounted at a fixed location or may be mounted on a conveyor belt or
other moving structure, as desired, for facilitating rapid
production of abrasively tipped bristle members. The mounting
aspects of the holder means 56 and, indeed, the detailed structure
thereof are not important to the basic concept of the present
invention and therefore are not shown in detail. The initially
uncoated free outer ends 30 of the bristle members 22 are
effectively held by the holder means 56 in adjacent, upwardly
extending positions (although this is not to be construed as a
limiting factor, and they might be held in other directional
relationships).
Apparatus of the type known in the art as a powder torch or flame
spray attachment or gun is shown in FIG. 7 and is generally
designated by the reference numeral 58. It will be noted that it is
adapted to be engaged at a rear end 60 thereof with respect to a
forward portion 62 of a conventional oxygen-acetylene welding torch
or the like, such as it generally designated by the reference
numeral 64 and which normally has two feed tubes, pipes, or hoses
66 and 68, respectively, which connect to corresponding oxygen and
acetylene supply tanks 70 and 72, respectively, usually through
appropriate control valves 74 and 76, respectively.
The two feed ducts 66 and 68 containing oxygen and acetylene,
respectively, are normally effectively combined in the conventional
torch 64 and would normally feed through a conventional torch tip
and provide a very hot flame for welding, cutting, brazing, or
other purposes in an entirely conventional manner.
However, since the torch body portion 64 is connected, as indicated
at 60, to the outer torch or flame spray gun attachment generally
designated at 58, the two gases are fed therethrough to an output
torch tip 78 where the flame is produced but in so doing the gases
pass through an aspirating mixing chamber portion 80 into which a
quantity of powdered applicatory material such as is generally
designated at 82, is adapted to be fed from an upper supply chamber
or hopper 84 which normally carries same.
The downward feeding of the powdered applicatory material 82
normally occurs when the spring-biased, thumb-operable lever 86 is
depressed, and at all other times only the two combustible gases,
oxygen and acetylene in the example illustrated, are fed through
the lower portion of the mixing chamber 80 and to the output torch
tip 78.
The entire assembled device illustrated in FIG. 7 may be said to be
a flame-spraying means, since the temperatures produced by the
burning oxygen and acetylene gases at the torch tip 78 are
sufficient to feed, melt, and effectively braze-weld a metallic
bonding material, such as that previously mentioned and shown at 40
in FIG. 6 after it has been solidified on the corresponding free
outer bristle end 30.
At the same time that the above-described action is occurring, the
other constituent of the powdered applicatory material 82, which
comprises the previously mentioned particles of extremely hard,
abrasive material 38 is or are also fed by the output flame shown
at 88 in FIG. 7, produced at the torch tip 78, onto each of the
free outer bristle ends 30, when directed thereupon so that the
melted, or at least partially melted (or, in some cases, vaporized)
metallic bonding material 40 of the applicatory powder 82 and the
unmelted abrasive particles 38 of the applicatory powder 82, are
fed together onto the rough outer surface of each of the free outer
bristle ends 30 and allowed to deposit thereon and to effectively
condense out so that the metallic bonding material or liquid 40
will effectively harden and solidify with the unmelted tungsten
carbide abrasive particles 38 held in disseminated relationship
therethrough and over the outer surface thereof, thus resulting,
after such a cooling and hardening has occurred, in a
fused-in-place, sintered-on enlarged abrasive globule such as best
shown at 32 in FIG. 6.
It will be noted that the size of the abrasive globule 32 produced
is a function of how long the applicatory powder 82 is allowed to
be deposited on the free outer bristle tip or end 30 by holding the
applicatory powder-dispensing lever 86 in a depressed position.
FIG. 8 illustrates a slight modification of the FIG. 7 showing,
wherein corresponding parts are designated by similar reference
numerals, followed by the letter a, however. In this slight
modification, it will be noted that the main difference is that the
two gas ducts or jets 66a and 68a do not combine prior to entering
the mixing chamber 80a but remain separate and the powdered
applicatory material 82a is fed into one or the other of said still
separate gas streams which are subsequently combined before
reaching, or at, the output torch tip 78a. This arrangement may be
employed in certain cases where the different flow rate of one or
the other of the two gas jets is such as to result in a superior
feeding and mixing of the powdered applicatory material 82a as
compared to the direct feeding of same into the combined two jets
as shown in the first form of the invention illustrated
diagrammatically in FIG. 7.
FIG. 9 is a view quite similar to FIG. 7 and shows a slight
modification thereof and because it is a modification, similar
parts are designated by similar reference numerals, followed by the
letter b, however. In this modification, it will be noted that
there are two different storage chambers 84b for two different
types of powdered applicatory material 82b, and each can be
controllably dispensed by operation of a different dispensing lever
86b into the combined gas jet flow path of the oxygen and acetylene
flowing to the torch tip 78b. The purpose of this type of
arrangement is primarily to allow the initial application of just
the powdered metallic bonding material 40b which, as previously
mentioned, may comprise a nickel-base alloy or the like, until a
substantial coating thereof has been built up on the corresponding
free outer bristle end 30b as is best shown in FIG. 10, after which
the other dispensing lever 86b is operated and a combination
powdered applicatory material 82b of substantially the same type as
that described above in connection with FIG. 7, is dispensed into
the flowing combined gas stream. This results in the abrasive outer
coating means 34b having an effectively outer layer which consists
of a large amount of the particulate abrasive material 38b (and
some of the metallic bonding material 40b) and having an
effectively inner joining layer which consists almost entirely of
metallic bonding material 40b, as is best shown in FIG. 10. This
modified version of the invention has certain significant features
arising from the fact that virtually all of the particulate
abrasive material 38b is positioned for maximum abrasive
efficiency, while most of the metallic bonding material 40b is
positioned for maximum bonding and joining efficiency. Otherwise,
this modification of the invention is similar to the first version
of the invention, and no further detailed description thereof is
thought necessary or desirable.
FIG. 11 illustrates fragmentarily a further slight modification of
the invention and, therefore, similar parts are designated by
similar reference numerals, followed by the letter c, however. In
this modification, the major difference is the fact that each
bristle member 22c is no longer made of twisted wire cable, but may
be made of various other physical constructions, of metallic
material, of course, and, if desired, the free outer bristle end
30c may be appropriately treated mechanically, chemically, or
otherwise, so as to provide an effectively roughened outer surface
such as is indicated at 90, which will enhance the strength of the
junction interface 36c or, if desired, such roughening treatment
may be eliminated in certain forms of the invention. Otherwise, the
FIG. 11 modification of the invention is similar to the previously
described forms of the invention, and no further detailed
description thereof is thought necessary or desirable.
FIG. 12 illustrates diagrammatically a modified method of fusing in
place the outer coating means comprising the particulate abrasive
material and the fusible bonding material with respect to a bristle
member end. Therefore, parts which are structurally or functionally
substantially equivalent or similar to corresponding parts of the
previously described forms of the invention are designated by
similar reference numerals, followed by the letter d, however. In
this modification, it will be noted that a container, which may be
a crucible or any other appropriate heat-resistant container or
vessel such as is indicated by the reference numeral 90, is adapted
to contain the melted or liquefied coating material or means
generally designated by the reference numeral 34d and comprising
both the liquefied bonding material 40d and the particulate
abrasive material 38d. In one preferred form of the invention, the
metallic bonding material may comprise a cobalt-based alloy
containing substantial quantities of cobalt and lesser quantities
of nickel and chromium in addition to other alloying elements such
as molybdenum, silicon, boron, iron, carbon or the like, although
not specifically so limited. The particulate abrasive material 38d
may comprise particles of silicon carbide, tungsten carbide, or any
other suitable, extremely hard, abrasive material. However, it
should be clearly understood that the invention is not limited to
either the exemplary bonding material or the exemplary particulate
abrasive material just referred to, which merely exemplify certain
advantageous compositions thereof.
In any event, it will be noted that the complete coating means 34d
is in substantially liquefied or semi-liquefied form by reason of
having been heated until such condition has been reached and, thus,
one or more bristle members, such as the exemplary bristle member
22d can be dipped therein by a process which is often called
"puddle-dipping," and, upon removal, it will be found that a layer
of the coating material 34d of a substantial thickness has adhered
to the free outer end 30d of the bristle member 22d. It will be
found that, immediately upon removal of the bristle end 30d from
the liquefied coating material 34d, it will begin to condense or
harden in place so as to effectively produce a fused-in-place
abrasive globule similar to that shown at 32 in FIG. 6, for
example, although perhaps of lesser diameter. However, the diameter
can be increased to any desired extent by merely repeating the
dipping and condensing operation as many times as is desired.
FIG. 13 illustrates a very slight modification of the method
illustrated fragmentarily in FIG. 12 and, therefore, parts which
are structurally or functionally substantially equivalent or
similar are designated by similar reference numerals, followed by
the letter e, however. In the FIG. 13 modification, it will be
noted that the crucible or container 90e contains only the
liquefied or melted bonding material 40e which does not contain
particles of the abrasive material similar to that shown at 38d in
FIG. 12. Thus, in this modification, each bristle member, such as
that shown fragmentarily at 22e, has its free outer end 30e dipped
into the liquefied or melted bonding material 40e, which then forms
a junction with the free end 30e of the bristle member 22e and,
immediately after removal from the quantity of liquefied bonding
material 40e in the crucible 90e, said coated bristle member end
30e is dipped into another crucible 92, such as is shown in FIG.
14, which contains the powdered particulate abrasive material 38e,
which then immediately adheres to the still semiliquid outer
surface of the coating material 34e which has just been applied to
the bristle end 30e by puddle-dipping in the crucible 90e of FIG.
13. This process can be repeated as many times as possible to
produce an enlarged abrasive globule similar to that shown at 32 in
FIG. 6, for example, of any desired size.
FIGS. 15 through 17 illustrate, in sequence, the steps involved in
a slightly modified form of the method for producing a bristle
member having an enlarged abrasive globule fused in place on the
free outer end thereof, and, therefore, parts which are
structurally or functionally substantially similar or equivalent to
those of previously described forms of the invention are designated
in said figures by the same reference numerals, followed by the
letter f, however. In this modification of the invention, it will
be noted that the initial step shown in FIG. 15 comprises the
heating of the bristle member free outer end 30f, which is done in
the example illustrated by mounting same in a thermally insulated
but movable holder such as that shown fragmentarily at 94, and
holding the bristle member end 30f in the flame 95 of a blow torch
97 (or otherwise heating same) followed by the dipping of the
heated bristle member end 30f into the powdered coating material
34f carried in the container 93 shown in FIG. 16. The heat of the
bristle member tip end or free end 30f will partially liquefy or
partially melt the bonding material constituent of the coating
means 34f and cause a fused junction thereof with respect to the
effectively roughened outer surface of the heated bristle member
end 30f so as to effectively produce an at least partially
fused-in-place junction therebetween. This step is illustrated in
FIG. 16.
FIG. 17 illustrates the next step, which comprises, again, heating
the bristle member free end 30f and the relatively small, abrasive
globule 32f, partially formed thereon in the manner described
above, until an effectively fused-in-place junction of the bonding
material thereof with respect to the bristle member end 30f is
achieved. As illustrated in FIG. 17, this second heating step again
comprises subjecting the bristle member end 30f and the coating
material 34f comprising the relatively small abrasive globule means
34f to the flame 95 of the blowtorch 97 or the like. However, it
should be noted that both the heating step shown in FIG. 15 and the
heating step shown in FIG. 17 may be accomplished by means other
than a blowtorch, and all such arrangements are intended to be
included and comprehended herein.
It should also be noted that the sequence of steps illustrated in
FIGS. 15 through 17 inclusive can be repeated as many times as
desired and with any desired form of suitable heating means so as
to effectively apply multiple coats of the coating means 34f to the
bristle member end 30f so as to produce an enlarged abrasive
globule 32f of any desired size.
FIG. 18 is a fragmentary view, somewhat similar to FIG. 6, but
illustrates a modification of the invention, and, therefore, parts
which are structurally or functionally substantially similar or
equivalent to those previously described forms of the invention are
designated by similar reference numerals, followed by the letter g,
however. In this modification it will be noted that the abrasive
globule 32g is effectively mounted on the free outer bristle end
30g by the provision of mounting means taking the form of an
auxiliary bristle end member, generally designated by the reference
numeral 96, which comprises a member made of a material such as any
of the types of bonding material previously described or other
appropriate material, designated by the reference numeral 40g, and
carrying in a fused-in-place relationship with respect thereto the
particulate abrasive material 38g, but with the auxiliary bristle
end member 96 being effectively provided with attachment means,
which may be of any of a variety of different types, for attaching
same to the bristle member end 30g. In the example, said attachment
means comprises the brazed junction indicated at 98, although it
might take the form of a soldered junction, a welded junction, a
junction fastened by any type of adhesive or cohesive means,
whether of metallic material, plastic material, or otherwise, or
any suitable type of mechanical attachment means. It will be noted
that the over-all effect is to produce a composite bristle member
22g, having the auxiliary bristle end member 96 firmly attached to
the bristle member end 30g and, therefore, being fully functionally
equivalent to the abrasive, fused-in-place globule form of the
invention in any of its different aspects as previously described
and as illustrated in other figures of the drawings.
FIG. 19 illustrates a very slight modification of the form of the
invention shown in FIG. 18, and, therefore, parts which are
structurally or functionally substantially similar or equivalent to
those of the FIG. 18 form of the invention are designated by
similar reference numerals, followed by the letter h, however. In
this modification all of the parts are similar to those illustrated
in the FIG. 18 form of the invention, with the exception of the
attachment means functionally equivalent to the brazed attachment
means 98 of the FIG. 18 form of the invention and, therefore,
designated by the reference numeral 98h in the FIG. 19 form of the
invention, wherein it is shown as comprising a mechanical type of
attachment means. Incidentally, it should be noted that, in certain
forms of the invention, if desired, the attachment means may be of
a removable type. Also, the auxiliary bristle end members such as
shown at 96 in FIG. 18 and shown at 96h in FIG. 19, may be of any
desired configuration and/or composition suitable for various
different abrasive purposes.
It should also be noted that, in certain forms of the invention,
the bristle members may be made of heat-resistant material other
than metal, and this may also be true of the bonding material of
which the abrasive globules are made, and all such arrangements are
intended to be included and comprehended within the broad scope of
the present invention.
While the present invention has been shown primarily in connection
with an end brush and has been shown primarily with the bristle
members being made of twisted wire cable, preferably stainless
steel cable, it should be clearly understood that the invention is
of sufficiently broad scope to include and comprehend various other
types of brushes and various other types of bristle members,
provided that the construction of the abrasive globules and the
methods for producing same fall within the scope of the broad
teachings of the present invention. For example, and not to be
construed in a limiting sense, one such type of modified brush
employing the novel type of bristle of the present invention
comprises what might be termed a wheel brush wherein a plurality of
bristle members of the novel type of the present invention are
carried by a bristle-mounting brush base means in radially
outwardly directed fashion so that the wheel brush will cause the
radially outwardly directed bristle members to simulate in
appearance the multiple spokes of a wheel radiating outwardly from
the central wheel hub simulated in appearance by the
bristle-mounting brush base means in such a modified brush. This
type of construction would have the inner ends of the bristles
fixed to the bristle-mounting brush base means in the form of a hub
with all of the abrasive globules being positioned at the extreme
outer circumference of the wheel brush, and it will be found that
this type of brush is very effective for use in abrading, cleaning,
and polishing the inner surfaces of welded junctions along an
inner, cylindrical surface, such as that provided by a plurality of
lengths of pipe which have been end-to-end welded together. This is
merely illustrative of one of the many other forms which the brush
may take within the broad scope of the present invention which is
directed primarily to the novel bristle and the method of producing
same rather than to any particular brush configuration.
It should be noted that in the FIGS. 18 and 19 form of the
invention, the auxiliary bristle end member, such as the one
generally designated by the reference numeral 96 in FIG. 18, for
example, or the one generally designated by the reference numeral
96h in FIG. 19, for example, may have the particles of abrasive
material 38g and 38h, respectively, disseminated throughout the
entire body of the auxiliary bristle end member, such as shown at
96 and 96h, respectively, and the complete so-called abrasive
globule such as shown at 32g and 32h, respectively. Indeed, these
may be of a unitary structure made of a common material comprising
the bonding material, such as shown at 40g and 40h, respectively,
having the particulate abrasive material 38g and 38h, respectively,
disseminated therethrough or on the surface thereof or carried in
any other manner previously disclosed in this application, with the
entire device then being adapted to be brazed onto the bristle end
in the manner illustrated in FIG. 18 or attached thereto in any
other functionally equivalent manner, or to be mechanically
fastened onto the bristle end in the manner illustrated in FIG. 19
or in any other functionally equivalent manner. In other words, the
invention is not limited to an arrangement wherein the auxiliary
bristle end member, such as generally designated by the reference
numerals 96 and 96h, respectively, be distinct from, or in any way
different from, the rest of the corresponding abrasive globule,
such as shown at 32g and 32h, respectively. Also, it should be
noted that the mounting recess may be modified or eliminated
entirely in certain forms of the invention, and the brazed or
mechanical attachment may be direct to the end of the bristle, and
all such arrangements, or functionally equivalent arrangements, are
intended to be included and comprehended within the broad scope of
the present invention.
It should be understood that the figures and the specific
description thereof set forth in this application are for the
purpose of illustrating the present invention and are not to be
construed as limiting the present invention to the precise and
detailed specific structure shown in the figures and specifically
described hereinbefore. Rather, the real invention is intended to
include substantially equivalent constructions embodying the basic
teachings and inventive concept of the present invention.
* * * * *