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Nov. 12, 1946.
Filed Aug. 7, 1944
Patented Nov. E2, 1946
Albert Field, Dayton, Ohio
Application August 7, 1944, Serial No. 548,367
2 Claims.
(or. 51-185)
The present invention relates to abrasive tools
employed for polishing or ?nishing metal, rub
reduced amount of adhesive without sacri?cing '
the effectiveness of the ?nished roll. Thus the
cost of manufacture of the improved product
made in accordance with the method described
hereinafter is materially reduced.
The invention will, be better understood when
In my Patent, No. 2,290,098, granted July 14,
reference is made to the following description and
1942, there is disclosed an improved form of
accompanying drawing in which:
abrasive tool in which the abrasive element com
Figure 1 represents an elevational view of a
prises a strip of abrasive material such as emery
complete, abrasive tool including the shaft or
cloth having an adhesive along one edge of the
shank and the abrasive element‘made in accord
material and wound to a cylindrical shape, with
ance with the present invention.
each layer in close contact with the under layer
Figure 2 is an elevational view of the'shank or
so as to constitute an abrading element of solid
shaft removed from the abrasive element to show
and integral character. The bond between the
adjacent layers is strengthened by breaking down 15 the manner in which the shank is rigidly ‘secured
to the element.
the abrasive surface at predetermined points-in
Figure 3 is an enlarged perspective view of the
order to provide an area which can be brought
abrasive element partially unwound to indicate
into more close adhesive engagement with the
the method of manufacture.
layer on which it rests and thereby increase the
rigidity of the convolutions as a whole. The ad 20 ‘ Figure 4 is a development of the abrasive ele
ment in unrolled form to show the shape of the
herence between these superimposed layers is to
piece of abrasive material.
prevent the rolled portions from becoming loose
Figure 5 is a perspective view of the slotted
in use. The strip is rolled on a slotted mandrel
mandrel on which the abrasive strip or piece is
and as the glue hardens the forming mandrel
wound to form the working end of the abra
is removed so that the opening left in the cylin
sive tool.
drical member is adapted to receive a work shaft
Referring to Figures 1 and 2, reference char
or arbor.
acter I designates the shaft or shank of the abra
In operation, the shaft is inserted in a revolv
sive tool, the shank being adapted to be re
ing power head such as a drill chuck and the
work piece is brought into contact with the abra 30 ceived at its upper end in a drill chuck or power
driven clamping head in order to rotate the
sive surface of the element which has the e?‘ect
shank. The lower end of the latter as indi
of smoothing the surfaces by abrasion.
cated at 2 is tapered and terminates in a por- .
As the art developed, it was found desirable to
tion 3 having a coarse thread which is sepa
employ abrasive elements of shapes other than
rated from the upper portion I by a shoulder 4.
cylindrical in order to accommodate the multi
The abrasive portion or element of the com
tudinous numberof shapes of work pieces. An
bined tool comprises a conically shaped piece 5
abrading tool having a conical con?guration was
of abrasive material which is formed by amn
found to be highly useful in this ‘connection and
ing method and in which the strip has'ja fairly,
the problem presented itself as to the best way
such an element could be practically made in view 40 steep angle of incline indicated at 6.
The upper portions of the rolled edge 6 is pro
of its taper. The present invention is concerned
vided on its interior or abutting surfaces with
with an improved method of fabricating abrasive
an adhesive constituted of any strong glue suited
tools of this type, i. e. of conical shape, and also
to the character of the surface of the abrasive
an improvement in an abrasive tool made accord
element. It will be understood that the latter is
ing to the improved process.
usually formed of emery cloth although in cer
The primary object of the invention is to pro
tain instances sandpaper may be employed so
vide a tool of the character described which shall
that the outer surface of the stripis of a coarse '
have a long tapering con?guration and which can
abrasive character and the underneath surface
be readily fabricated by machine or hand and
in which the various convolutions are rigidly held 50 is fairly smooth. The glue is preferably applied
to the smooth surface.
together so as to impart long life to the abrasive
When the abrasive strip has been wound in a
tool as a whole.
manner described hereinafter and the adhesive
Another object is to provide a tool of the abra
her and plastic materials and an abrasive ele
ment for use in connection with such tools, also
an improved method for making such elements.
sive strip type which requires the minimum abra
sive strip material to form the tool and also a
allowed to set, a tapered hole will have been left
within the conical member. The upper edge will
have been so strongly bonded as to permit the
threads 3 of the shank I to ?rmly bite into the
element and therefore securely held thereon. It
is apparent that after continuous use the abra
sive surface may wear smooth, necessitating dis
carding the element 5, in which case it is simply
necessary to unscrew the shank | at the threads
tends to the lower end of the mandrel 8 so that
in order to remove the ?nished cone from the
mandrel it is necessary merely to slip the strip
It will be noted in Figure 5 that the lower
edge a takes an inclined position with respect to
the horizontal direction as the winding proceeds
3 and to apply a new abrasive cone. The fact
that the lower end of the cone contains no ad
clinationbecomes fairly steep. The advantage of
hesive between turns tends to impart to this end
a certain amount of yieldability or resiliency and
therefore eliminates any tendency to gouge or to
mar the work under certain conditions which is
a characteristic of less ?exible abrading tools.
downwardly out of the slot.
and as shown in Figures 1 and 3 its angle of in
this particular construction is that there is only
a limited number of layers of material at the
lower end of the cone where maximum yieldability
is required but there is the maximum number of
layers at the upper end of the cone where a bear
In the manufacture of the abrasive element, 15 ing surface is necessary in order to receive the
the ?rst step is to provide the strip of abrasive
threaded portion of the shaft or shank I.
material. It had been customary heretofore to
My invention contemplates the use of a strip 5
utilize a strip having parallel edges so that as the
of abrasive material as shown in Figure 4 of a
strip was wound conical or helical fashion the
predetermined shape and size such that when the
uppermost edge of the strip would extend con 20 strip is wound on a mandrel 8 the convolutions
siderably beyond the shoulder I in which case it
at the upper or'larger end of the cone will form
became necessary to cut or shear the material in
a square ‘end, thus eliminating the necessity for
excess at this position. This was a difficult Job
any cutting of excess material after the winding
as obviously the presence of the abrasive parti
operation has been completed. The direct re
cles would dull the cutting instrument and in 25 sult of this improvement is that for a given piece
addition there would be considerable waste of
of abrasive material, such as emery cloth, more
material. However, in accordance with the pres
patterns 5 can be cut from stock than was here
ent invention, I propose to start out with a strip
tofore possible since the size of the strip 5 is re
which is of such predetermined shape consider
duced to a minimum and there is no excess ma
ing the inclination or angle of taper desired and 30 terial. It is apparent that my invention is not
the length of the tapered tool 2 as to cause the
limited to a strip in which the glue is applied to
upper edges of the top rolls or turns to coincide
any particular area 9 but if desired an adhesive
with one another to constitute a squared ?at
can be applied to any part of the strip although
in the interest of economy I have found it neces
The starting strip of material is shown in Fig 35 sary to limit the area and position of the glued
ure 4 and it will be noted that the strip is pro
vided with two edges a, b, substantially at right
The edge e could, if desired, be perforated in
angles to one another, the edge a being consid
any suitable manner by causing a perforating de
erably greater in length than the edge b. The
vice to act upon the strip 5 in such a manner that
outer edge e is cut to a shape of varying curva 40 the device enters the strip by ?rst engaging the
ture, that portion of the edge near the edge b
abrasive surface thereof and then passing
being somewhat more ?at than the edge which
through the fabric, in the case of emery cloth. to
subjoins the edge a. The exact shape of the edge
cause said material to break out from the surface
e can be determined by cutting the edges square
and leave protrusions (not shown) which in ef
at the shoulder l and then unwinding the roll
fect roughens the surface around the protrue
or may be predetermined in any other manner.
slons. Adhesive may be applied to areas about
Succeeding strips can then be cut to the same
these protrusions to cause closer adhesive en
shape for use in connection with similar shanks
gagement at these positions with the underlying
and tapered portions.
In fabricating the abrasive element, assuming
that the strip has been cut to a predetermined
:‘r‘j 2 either calculated or found by experiment,
the edge b of the strip is inserted within a slot
1 extending longitudinally of a manufacturer's
mandrel 8. The latter is then turned as indi
cated in Figure 5 while exerting a pull on the
An area 9 on the smooth or unabrasive
surfaces as the strip is being rolled into a conical
formation. Thus the invention contemplates any
and all ways and methods of securing the turns
together provided that the initial strip or strips
takes on a shape such that when rolled into the
conical formation the upper portion shall present
a square shape and will not require any severing
of excess strip material.
While the structural arrangement of the ap
side of the strip is coated with a good adhesive,
paratus disclosed and described herein constitutes
either while the strip is in ?at form as indicated
a preferred form of the invention, it is to be un
in Figure 4, or during the rolling or winding 60 derstood that the apparatus is capable of altera
process as shown in Figure 5. It will be noted
tion without departing from the spirit of the in
that this area extends over only a portion of the
vent-ion, and that all modi?cations that fall with
outer edge e of the strip as it is necessary to
in the scope of the appended claims are intended
bond only the last few remaining layers of the
to be included herein.
conically shaped element in order that all of the 65
Having thus fully set forth and described my
turns shall remain in a ?xedly secured condition.
invention what I claim as new and desire to
As the winding proceeds, each portion of the up
secure by Letters Patent is:
per edge 0 of the strip will rest on every other
1. A device of the class described comprising in
portion throughout its entire length and will
combination a frusto conical mandrel and an
form a sharply defined shoulder or end on the 70 abrasive element comprising a spirally rolled
abrasive element so that when the entire strip
is wound on the mandrel a solid and rigid cone
strip of material having abrasive applied to one
surface thereof, the material being rolled in a
frusto conical form and in unrolled condition
of abrasive material is formed which compares
favorably in operation with a wheel or a rod
being bounded by a pair of angularly disposed
formed of grindstone material. The slot 1 ex 75 straight edges which are subtended by a cur
conical form and in unrolled condition being
bounded by a pair of angularly disposed straight
vilinear edge, with adhesive applied along said
curvilinear edge on the opposite side from said
abrasive material, said frusto conical‘ mandrel
having a slot and said strip being wound around
the frusto conical mandrel with one of its edges
disposed in said slot and another edge present
ing a steep spiral along the face of the abrasive
surface of the wound frusto conical element.
5 .
edges which are subtended byv a curvilinear edge,
said straight edges forming a substantially right
angle, with adhesive applied along said cur
vilinear edge on the opposite side from said abra
sive material, said frusto conical mandrel having
a slot and said strip being wound around the
2. A device of the class described comprising
frusto conical mandrel with one of its edges dis
abrasive element comprising a spirally rolled strip
steep spiral along the face of the abrasive sur
of material having abrasive applied to one sur
face thereof, the material being rolled in a frusto
face of the wound frusto conical element.
in combination a frusto conical mandrel and an 10 posed in said slot and another edge presenting a
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