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Патент USA US2110937

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March 15, 1938.
>
‘
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‘ F. NOWN
‘ v
42,110,937
MANUFACTURE OF COVER‘TS FOR ABRASIVE TOOLS
Filed Jan; 15, 1937
/
2 Shéets-Shee'l; 1
15, 1938.
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‘2,110,937
F_ NOWN
MANUFACTURE OF COVERS FOR ABRASIVE ri‘OOLS
Filed Jan. ‘15, 1937
2 Sheets-Sheet 2
M/l/m
4%%% If.
' Patented Mar. 15, 1938 ' a
.\ 2,110,937
" UNITED STATES‘ PATENT ‘OFFICE
2,110,937
_MANUFACTURE ‘or COVERS FOR mnmslvn
TOOLS I
Frank ‘ Nown, ‘ Leicester, England, assignor to
United Shoe Machinery Corporation, Paterson,
N. J., a corporation of New Jersey
Application January 15, 1937, Serial No. 120,772
In Great Britain February 3, 1936
'
~ 6 Claims. ('01. 515-278)
This invention relates to the manufacture of members being moved outwardly in unison by~a
covers for abrasive tools and is herein illustrated
With the above and other objects and features
and described with relation to the preparation
of an abrasive cover for a tool of the character in view the invention will now‘be described with
5 disclosed in an application for United States reference to the, accompanying drawings and 5
cam
Letters Patent Serial‘ No. ‘755,962, filed‘ December
4, 1934 in the name of Fred Ricks and Ernest .
Hope. This tool is of the ‘rotary disk type but
inasmuch as only the rim portion. of the tool is
mechanism.
‘
I
‘
p
.
pointed out in the claims.
In the drawings,
‘
Fig. 1 is a plan View of a sheet of abrasive
coated woven fabric folded with two of its edges
cemented together-in overlapping relation, one 170
of abrasive material applied to the rim portion corner of the sheet being shown as turned up
only of ‘the tool rather than from a relatively - wardly to indicate the direction of weave of the
material as being bias relatively to the edges of. ,
large sheet covering the face of the tool.
10 utilized, the abrasive cover'is formed from a strip
It is an object of the present invention to pro
15‘ vide an improved‘ method of making such abrasive
covers. In accordance with the method shown
the sheet;
-
I
Fig. 2 is a view in end elevation of the sheet 15
shown in Fig. 1, ‘showing also a gage plate which
herein, an abrasive cover for the rim of a rotary -
may be used to assist in folding the sheet tothe
driven tool is made by securing together the ends
required size before cementing;
of a strip of abrasive material to form a closed
20 band and in molding the band While in moist
‘
,
Fig. 3 is a. plan ,vlew indicating a band out
from the sheet shown in Fig. l;
,
20
Fig. 4 is. a perspective view? showing the band‘
condition” by the application of internal pressure
to a desired shape corresponding to that of the out in Fig. 3 after it has been opened out into
peripheral portion‘ of the tool upon which the circular form; v
Fig. 5 is afragmentary view indicating the
cover is to be applied. According to the method
25 illustrated herein, a strip of abrasive-coated cloth - nature of the cemented joint;
25
Fig. 6 is a plan View of a forming or shaping
is prepared‘ with the edges of the strip in.v bias
relation to the weave of the cloth; the ends of 'member in unexpanded condition;
the. strip are then cemented together to form" a
closed band with the abrasive ‘coating on the out
30 side; the band is then moistened and stretched
to a desired shape by expansive pressure applied
internally and it is maintained thus stretched
until it dries to thedesired shape.
'
’
Fig. '7 is a sectional view‘taken along‘the line
VII-VII of Fig. 6;
'
Fig. 8 is alvlew similar to Fig. 7 but indicating 30
a band in place on the unexpanded forming mem
ber;
,
.
.
' Fig. 9 is a plan view of the‘forming‘ member
A further object of the invention consists in '"with a band thereon after the forming member
.35 the provision of an improved apparatusv for mak
has been expanded;
,
I
35
Fig. 10 is a sectional view taken along the line
ing such abrasive covers. As shown herein the
improved apparatus. comprises a'ring of rubber ’ X-X of Fig. 9;
Fig. 11 is a perspective view ‘of, a ‘completed
adapted to engage the interior of an abrasive
1 band and means for expanding the ring to cause cover »member ; the ring ‘to stretch the band. In the illustrated “I Fig. 12 is a plan view of an apparatus for use in 40
expanding the forming member; and
device, a ring of resilient metal‘ is interposed be
Fig. 13 is a sectional view taken along the line‘
tween the rubber ring and the expanding ‘means,
the ends of the metal ring being in overlapping ' MIL-XIII of Fig. 12 and showing a forming
member with a band thereon in position to be _
relation when the ring is unexpanded and ar
ranged to snap into abutting relation'when the
In Fig. 1 is shown‘a sheet I of woven fabric‘
rubber ring is expanded to‘ its fullest extent,
expanded.
thereby to‘ maintain the rubber ring expanded
when it is removed from the. expanding means.
The illustrated apparatus for expanding the rub
50
ber ring comprises a plurality of members ‘con
structed and arranged for radial movementwith
respect to a common center, vveach of which mem-‘
bers has an arcuate bearing surface for engag
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*
,
'
coated on one. sidewith abrasive and cut in
such a manner that the threads of the material,
as indicated by the reference character 3, run
in bias relation to the edges of the sheet. A 50
pair of opposite edge portions of the sheet have
been folded in overlapping relation and glued
together, a corner of the sheet being shown as
turned over merely for‘ the purpose of better
ing the interior of the'ni'etal ring, the several illustration. The folding of the sheet to a pre- 55
e
2
2,110,937
determined size is readily accomplished my em
ploying a gage plate 5 (Fig. 2)_ about which
the sheet may be folded. As indicated in Figs.
1 and 5, the abrasive coating has been removed
or preferably omitted from the underlying sur ,
isters the completed band will be of the desired
shape.
After the band 9 has thus been mounted upon
the forming member II, the forming member is
expanded by an apparatus which will presently
face of the joint,‘ ‘while the overlapping edge be described. The expansion of the forming
extends just beyond the boundary of the under member stretches the rubber annulus l3 to the
surface which is free of abrasive. We have found. greater diameter shown in Fig. 9. As the forming
a joint prepared in this manner to be particu
member continues to expand, the overlapping ends
10 larly e?icient as regards resistance towear. In
I! and 2! of the strip l'|.,will ?nally snap resilient
gluing the edge portions of the sheet together ly into abutting relation as shown in Fig. 9. The
strip I‘! will thereupon serve to hold the annulus
83 in expanded condition. The operator, when
joint. This may readily be accomplished by he so desires, can readily contract the annulus
placing the assembly shown in Fig. 2 of the abut--v to its normal condition by ?exing it to bring the 15
ends l9 and 2| out of abutting relation. The
- sive sheet I and the gage plate 5 between the
platens of a suitable press. After the glue has strip l5 appears to assist in insuring that upon
set to form a firm joint the gage plate 5 is re-. expansion of the forming member the ends [9
moved and the folded sheet I is cut through both and 2| will assume and retain an abutting rela
it is desirable to subjectv the sheet to pressure
while the glue sets in order to insure a firm
20 its thicknesses along the lines indicated by the
reference character ‘I (Fig. 1) into'a numbenof
bands 9 (Fig. 3) of suitable width. The cutting
operation may be performed by a guillotine knife
equipped with a suitable gageto insure a uni‘
25 form width for the bands. Each band 9 may
then be opened out into circular form as shown
_ in Fig. 4.
An expansible forming member II is used for
imparting the desired molded shape to the band
30 9. This member, which is shown in unexpanded
condition in Figs. 6 to 8, comprises an annulus
13 of rubber having a cross-sectional shape in
general but not necessarily in exact correspond
ence to the cross-sectional shape of the abrasive
35 tool body upon which the completed cover is to
be used. . Positioned against the inner surface
of the annulus is an arcuate steel strip II which
extends around somewhat more than half the
tion.‘
~
20
As a result of the expansion of the forming
member the band 9 which, as above mentioned,
will be in moistened or tempered‘condition, will
be stretched and in the course of such stretching,
,by reason of the fact that the weave of the ma 25
terial is on the bias, the marginal portions of
the band will turn inwardly closely to embrace
the adjacent portions of the annulus l3. This
effect is a result of the stretching action and
does not require molding under pressure between 30
dies. In Figs. 9 and 10 the band 9 is shown as
having assumed its desired shape. The band 9
is preferably allowed to remain on the expanded
forming member for about‘from three to six
hours to allow the band to set into its molded
shape. At the end of ‘this period the operator
contracts the forming member. in the manner
panded condition, is longer than th circumfer
aboveindicated. The forming member can then
be removed from the completed abrasive cover
which is shown in Fig. 11. When the forming 40
member is retracted and removed the band 9
does not contract; at least .to any appreciable ex
tent. The abrasive cover will thus have' the pre
ence of the adjacent internal surface of the an
The end portions of the " strip I‘! thus
determined circumferential size depending chie?y
upon the length of the strip IT. The size .may 46
circumference when the forming member is in
40 unexpanded condition. Also located within the
annulus I3 is a second arcuate steel strip I‘!
which, when the forming member is in unex
45 nulus.
overlap when the forming member is unexpanded. to a lesser extent depend upon the compressibility
In Figs. 6 and 7 the two ends of the strip H are ' of the rubber of the annulus l3 but if ‘bands 9
‘ indicated by the reference characters l9 and 2|. are originally formedof the same length and are
respectively.
made upon similar forming members in .each‘of
50
In using the forming member II the band 9 which the strip is of a uniform length, then there 50
is placed thereon as indicated. in Fig. 8.‘ We will be no appreciable variations in the circum
have found it‘ desirable that the band 9 should ferential size of the abrasive covers. A convenient
be in moistened or tempered condition during the . size for abrasive . covers for use in operations in
shaping operation and also that the band 9 should the manufacture of shoes is six and one-quarter
55 be slightly smaller circumferentially than the pe..,_ inches ‘in diameter made from a band. initially
. riphery of the forming member. When the band one and one-halfeinches in width. ‘
'
The apparatus'for expanding the forming
i is moistened it will stretch readily and hence can
easily be drawn manually upon the forming mem..
her.’ As shown in Fig. 8, the band 9 is not ap
60 plied centrally upon the forming member but
one edge of the band is closer to the forming
member than the other edge.
This is because
it is desirable in the finished abrasive cover that
one edge portion of the abrasive cover should
70
Y ‘
extend further inwardly than the other e'dge por
tion, as shown in Fig. 11. The operator in posié
tioning the band 9 upon the forming member II
can readily locate the bandin the desired re
lation by bending downwardly, as indicated by
the reference character 23, the upper edge por
, 3. tion of the band 9 to determine whether or not the
member is shown in Figs. 12 and 13. This ap
paratus comprises a ?xed circular base plate
25 on which a coaxial movable plate 21 in the
form of an annulus is mounted. The plate 21
has a circumferential ?ange 29 by which it‘is
retained in coaxial relation with'respect to the‘
base plate 25. The base plate 25 has formed
therein two slots 3| at right angles to each other
and each extending diametrically across the base
plate. In each slot 3| there are movable two
slide bars 33 retained in the slot 3| by- screws
35 the stems of which are capable of sliding in
narrow slots 31 in the base plate 25 and the en 70
larged heads of which are capable of sliding
in wider slots 39 in the base plate. The inner , '
edge registers with the'internal suriace of the end of each ofthe four slide bars 33 is pro
mber. The forming member is so de-_ vided with‘a segmentally-shaped member 4|
signed '
hen the edge of the band, thus reg
which upstands'above thesuri'ace of the base
forming '
is
3 ,
’ 2,110,937
plate 25 and is secured to its slide bar 33 byi-a
screw 43 and pins 45. Each slide bar 33 has,
2. The method of making an abrasive cover
for the rim of a rotary driven tool which con
sists in making a strip of abrasive-coated cloth
near its outer end, a cam roll 41 upstanding
with the edges of the strip‘in bias relation to the
weave of the cloth, cementing together the ends
therefrom and carried by a stud 49 passing
through the bar and having a nut 5| on its
upper end. The rolls 4'! engage in arcuate-slots
53 cut in the plate 21 and above the rolls on
01 the strip to form a closed band with the abra
sive coatingon the outside, moistening the band, _
stretching the band to a desired shape by ex
' the studs 49 are washers 55 of larger diameter
pansive pressure applied internally ‘of the band,
than are the slots 53. Thus the plates-~25 and
Z‘I'are heldvtogether in assembled relation by
the parts described. As shown in Fig. 12,- the
slots 53 extend in directions having both radial
and maintaining the band thus stretched while 10
the band dries to the desired shape.
>
3. A device for shaping abrasive bands com
and tangential components. ' Bolted to the upper ~ prising a ring of rubber adapted to engage the
surface of the plate 21. is a laterally extending , interior of an abrasive band and to be expanded
715
20
handle 51. The arrangement is ‘such that on
rotating the plate 27 by means of the handle 51
to stretch the-band, and a ring of resilient metal
within said rubber ring, the ends of said metal
in a clockwise direction as viewed in Fig. 12 the
slots 53 serve to move the cam rolls 41 outwardly.
Thus the members M are also moved outwardly
[ring overlapping when the rubber ring is un--'
expanded and abutting when the rubber ring is
in 'unison.
,
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.
'
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expanded, said metal ring with its ends in abut-'
tinggrelation' serving to- maintain said rubber 20
_
.In the use of the apparatus a forming member
ring expanded.
II with a band 9 thereupon is placed in the \
apparatus in‘ the position ‘indicated in Fig. 13,‘
-
a
'
4. VA device according to claim 3 including also
’ an arcuate strip of metal between the lapping
ends of the resilient metal band and the interior
of the rubber‘ ring.
25
5. An apparatus ,for shaping abrasive bands
surface of theband 9 resting against the base
plate 25. The handle 51 is then manipulated to ' comprising a ring of rubber adapted to engage
the interior of an abrasive band, means for ex~
cause the members 41 to move outwardly as al
ready described. These members will engage the pending said ring to- cause said ring to stretch
30 inner surface of the strip‘ I1, their surfaces which the band, and means for maintaining said ring
engage thev strip being shaped, as seen in Fig. expanded after removal from said expanding
12,‘ to‘ a curvature in general correspondence with means.
'
6. An apparatus for,stretching abrasive bands '
that of the strip i'l when the forming member.
comprising a pair of coaxial disks constructedv
is expanded. The outward motion of the mem
bers 4| serves to expand the rubber annulus and arranged for relative rotation, one of said]
l3 until, as hereinbefore described, a stage ‘is disks having guideways extending outwardly
I reached at which the ends {9 and 2| or the‘strip' , from its central portion and the other disk hav
l1’ come into abutting relation to maintain ‘the ing cam elements and having a central opening,
forming member _is expanded ‘condition. The a slide retained in each of said guideways by,
handle 5'! may then be moved counterclockwise said disk, imeans on‘sald slides in. co-operative 40
and the expanded forming member removed engagement with said cam- elements to cause
the members 4| being located in the space within
25 the interior of the forming member and the lower
'3.
4;“ from the apparatus.
Thisapparatus enables the
expansion of the forming member to be per
formed quickly and easily. '- ‘
_
'
outward or expanding movement of said slides
upon relative rotation of said disks, and a mem
ber carried by each slide having an arcuate bear
ing surface adapted to engagethe interior of 45
an article to be expanded, said work-engaging
members extending through the central opening
ent vof the United States is:
Y
1. The method of making an abrasive cover for. vof.;_said cam disk, and said arcuate surfaces when
the rim of a rotary driven tool which consists in the work-engaging members are expanded hav
preparing an endless abrasive band of fabric with ing'a common center in ‘the axis of said disks.
Having thus described my invention, what I
(claim as new and desire to secure‘ by! Letters Pat
'50
, the weave or the fabric in bias relation to the‘
circumference of the band, and in' shaping the/
" band by an expansive force applied from, within
the band.
FRANK NOWN.
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