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Патент USA US2132600

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Oct. 11, 1938.
G. c. BECK
2,132,600
ABRASIVE THEATER
Filed Sept. 7, 1937
Jaye.
4,
21
-
INVENTOR
George 6.’ Zea/I’
ATTORNEY
2,132,600»
Patented Oct. 11, 1938
UNITED ; STATES sA'rsnT OFFI-QE ;
2,132,600
ABRASIVE
THEATER
‘
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.
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_.>_
George CLBeck. Spokane, Wash.
‘ Application September 7, 1937, Serial No. 162,603
(01. 51-1844)
11 Claims.
I ‘This invention relates to improvements in de
which they would assume before being inserted
into “a cylinder.
vices for treating the walls‘ of ‘cylinders of ex;
plosion engines.
‘
g
It is well knownthat after a.’ cylinder grinder
' ' Fig. 2 is a vertical sectional view on line 2-—2
of Fig.1.
.
5,, has‘ been used with the customary emery and
I ' Fig. 3 is a sectional View on line 3--3 of Fig. 2,
burnishing stones,‘ minute particles of emery re-
Showing the device ina Cylinder but exaggerating
mam ‘on the cylinder wall and these particles
the thicknesses of various parts and illustrating
'
cause very objectionable wear on the piston rings.
Now it is an important object of this invention
10‘ to abrasively treat the wall of the cylinder to
the deViCe before the Same has been expanded
Fig. 4 is a fragmehtal Sectional View Of portions
of the device Showing the reletiel'lship When the 10‘
remove this objectionable condition and ‘provide parts are contracted 1101a small diameter
an entirely smooth and burnished surface for ring
‘Graver
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‘
_
Fig- 5'18 a VieW Of One Of the pivot I‘OdS ifl Side
elevation,“
‘It is also wen known thatlwear on the upper
15;. travel portion'of a cylinder will enlarge the same
to ‘such an extent that it will be tapered with
respectfto the lower'portion of thecylinder, and
it is of great‘advantage, as is well understood,
‘
V
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"
'*
Fig. 6 is a View of thesame in edge elevation.
SW65
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to be able to remove this taper and restore the
20;. cylinder to a truecylindrical form.
Fig- 9 'iS a Sectional View On line 9-9 thereof
Showing the same on an enlarged Scale'
Now it is‘ a ‘feature Of this invention‘ to équip.
’ Fig. 10 is an enlarged sectionalview of one of
this devicewith means whereby the'sarne may;
beiused'a's a grinder to- remove the taper in a
cylinder’ and'after this has been done’ the device
25 can be equippedto smogth off the ground poi"...
tione'of the cylinder, and also‘ remove emery or
metal particles resulting from the grinding treatment‘
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plurality
It is a of
feature
backingstrips
Qf the invention
to whichtoanprovide
abrasive3‘
tivet'o' the centrallyvldisposed driving means. ~
strips so that they will normally tend to contract toward the smallest diameter and topro40. vide su?lcient strips of the required length so
thatat all diameters, the strips will form abacking for‘ the abrasive consisting ofa multiplicity
of thicknesses ‘whereby an ample circumferential
will alwa s be
>
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Fist 11 is a sectional view on line I I of Fis- 2-‘
Like characters of reference designate similar
parts throughout the different ?gures of the 215:
. drawing
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I ' In‘ the form ShOWIIL l~ designates a. driving
adapted.
01"
any desired
to be Connected
form of couplinga with
universal
which the
i9.
selected motive power is equipped. Said spindle"
I 15 Shown to‘ be exteriol‘ly threaded at 4, sub
stantially throughout its length, and at its lower
end’ Said Spindle is provided with a plurality Oil
Pivot h1g5 5, Preferably foul‘, in number, inthe 315,
form Show“ 'It‘ W111 be understwd that Spindle
It ‘is a further feature to tension‘ the backing
t ba kin
the IJiVOt Tod- Sleevesi
it
spindle having a vcoupling head 2,. With'studs 3,
strip or strips may be connected, these backing’
strips being relatively loosely assembled and semi?oatingly or pivotally connected with a.‘ driving
means so that the assemblage‘may readily assume
35 either a concentric or tapered relationship rela-
resili
'
Fig- '7 is a detail View-Showing hOW the ebrev- 1.5‘
sive may be secured to one of the backing strips.‘
_ Fie- 8 is e planview. of 3' novel form ‘of abm"
rovided to sus-
'
I, not only imparts rotary motion to the device
but_ e159 advanc?s the latter lengitudinelly .of
the cylmder, as‘ 15 Customary in_ q-evices of this
n_a'turef_ connected Wlth t1?“ ‘drlvmg 01' Pmpm" ‘k0
SW6 Spindle I are a'_p1um11ty 9f 917091115?’ e_ arid
expafldmg or Spreadmg Pam‘ bars‘ Whmh’ 1.11 ?ns
‘$33122i3231511???n‘i‘etlri??riuniti?1(it?
’
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45‘ taintglfeabfasivge. action agginst the cylinder wall. one Peed be qescnbed 'm deta?althouglt an a“? 45‘
.‘The invention has many other features and.
nb‘ .. t
{hi h
‘11b
' J89 S “ 1c - W1.
5
m ‘
9
f u
d
_b d _
V
_
Ore H Y escn e _ m con
genelauy ideslgna-te'd at
Each bar 6,. 15 of u- ‘
shaped cross section having a web ‘I and ?anges
8; the, edges 9 of the latter forming cam tracks.v
nection with the accornpanylng drawlng ahd
The lower ends of bars 6 are connected with lugs
whlch W111 be more partlf‘ula?y pomted, out 1n
and by the appended clmms-
5 by pivots ll! of any desired form, and from this ‘50
pivotal connection, the bars 6, extend radially
In the drawing: '
>
"
i
Fig. 1 is an end view of the device looking
toward the lower end and showing the backing
strips in an expanded’ and‘ separated- position
outwardly at an upward inclination in the many
ner clearly shown in Fig, 1,
,
‘
Reference will next be made'to an improved
cam means for adjusting the bars 6,to cause 55.
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2
2,132,600
expansion or permit contraction of the backing
strips, to be later described.
,
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This cam means, in the present showing, con
sists of a cam sleeve Ii, in threaded engagement
with spindle I and having on its upper end an
ment, and margin !9' and lug 22, as regards the
lower engagement.
It will be seen from Fig. 3, that the direction
of rotation is clockwise and that the rods 2|,
with the surrounding sleeves [1, form expan
adjusting head 12 provided with spanner open
sion elements which serve to expand the nor
ings 13 into which spanner rods may be inserted
to cause a relative longitudinal adjustment of the
mally contracting backing strips l5 radially ‘out
spindle member 5 and cam member ! l, as a result
bev noted that all the strips [5 are disposed out
wardly against the cylinder wall A.
It will also
10 of turning one member relative to the other, as wardly with respect to the expanding elements 10
‘will now be clear. The lower end of said sleeve , so that when the latter are expanded, they will
II is flared at l4 to form a bell-shaped cam act upon all the strips. The arrangement is such
adapted for engagement with the cam tracks 9 a that the strips I5 overlap each other at all diam
of the cam bars (5 to expand or permit contrac
eters and hence always present a backing con
15 tion of the latter, as will now be clear.
sisting of a multiplicity of thicknesses in forcing 15
Reference will next be made to the norvel
the abrasive strips, to be later described, against
backing strips and to the manner in which they
the cylinder wall A.
are assembled.
I now wish to draw attention to the fact that
the bars 5 are pivoted at 24 to lugs 22 to com
In the present construction, these backing strips
‘
20 are four in number but this is not an essential or
plete the propulsive and supporting connection 20
between the spindle I, and the assemblage of
cessfully used but the present number affords backing strips I5, and that the axes of these
and offers special advantages which will be fully ' pivots 24 are not only disposed substantially mid
appreciated in view of the present disclosure. As way of the height of the backing strip assem
25 all of the backing strips are identical in form and blage but at right angles to the axis about which 25
arbitrary number since one or more can be suc
function, only one need be described in detail.
These ?exible strips are preferably formed of
the assemblage is rotated. Thus it will now be
clear how the strip assemblage can not only po
thin clock spring steel of. a length less thanythc
complete diameter of the circle of the cylinder.
30 As shown, [5 designates a backing strip the thick~
ness of which is shown in Fig. l, and the width
of which is shown in Fig. 2. This strip is advan
tageously tensioned to normally contract toward
the smallest diameter of cylinder in which the
35 device can be used, and expansion of the strip
is effected against its tension.
The free advance end of strip I5 is designated
at l6 and the following or trailing end is pro.
sition itself automatically in the cylinder, but it
vided with a hollow sleeve H, which, as shown in
40 Fig. 10, may consist of a cylindrical sleeve l'l,
having its ?anges l8 secured as at l9, to the end
of the backing strip 15. The sleeve thus formed
is provided with an opening having an upper
margin 18’ and a lower margin l9’ which are
45 the margins of the opening longitudinally of the
will also be clear how the assemblage can assume
either-a concentric reationship‘ with respect to 30'
spindle i, or a tapered relationship thereto.
It will also be clear that the cam tracks 9, of
the bars la‘, are so disposed by reason of the pro
portions and the manner in which they are piv
oted to the lugs 22 that the tracks 23 will form a
contiguous extension of the tracks 9, so that with
a small diameter adjustment the cam | 4 can ride
up onto tracks '23, aswill be clear by reference
to Fig. 4.
.
As all the advance free ends I 6 of the strips I5
will normally abut against the periphery of the 40
‘next adjacent strip, as will be seen from Figs. 1
and 3, it will be clear that in some instances I
may employ this gripping action effectively to
connect the abrasive strips thereto without what
sleeve. Circumferentially, the opening is shown . might otherwise amount to securing the same in
in Fig. 11 as having margins 20, the purpose be
the sense of an actual fastening means, as will
ing to afford a pivotal connection as will pres
presently appear. Further, I desire to point out
ently appear.
that the resilient strips l5 are strong enough
A pivot or propulsive and expanding rod 2|, to be self stable but are of amply su?icient
50
which is also an equalizing rod, is disposed in strength to stand an appreciable degree of com
said sleeve to ?t relatively loosely therein as re
pression stress without becoming deformed from
gards relative rotary movement of said sleeve their'originalshape, and I have successfully used
with respect to said rod. As clearly shown in number ?fteen thousands gauge clock spring
steel in the performance of the function set forth.
55 Figs. 2 and ‘l, the rod 2| extends practically coex
tensive with the length of the sleeve I‘! and is
Reference will next be made to the abrasive
provided with a pivot lug 22, which extends lat
means and to the manner in which it is used.
erally from the body of said rod 2!, as shown
In light duty service, such as smoothing the
in Fig. 5. A cam track 23 extends upwardly from cylinder wall, I have successfully used sandpaper
where I desire merely to remove emery and metal
60 said lug and at an incline, it merges into rod 2!
and forms with said lug 22, a projection adapted particles resulting from previous grinding or
to extend through the opening formed in sleeve honing. However, in heavy duty service where I
ll, whereby the sleeve I‘! will be hingedly con— desire to remove the taper of the cylinder and
nected with said rod 2| so that'the backing strip actually take off some stock from the block, I
employ a type of emery paper and in some in
65 can, to a limited extent, which is all that is nec
essary, relatively rotate with respect to and about stances, after using the emery paper I may sub—
rod 2l-. As will be seen by. reference to Figs. 5 sequently employ sand paper to remove emery
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and 6, the rod 2| is flat, in the construction particles.
In
either
event
the
width
and the length of
shown, and while this is a convenient cross sec
70 tion, it is not an essential one. The desirable either type of abrasive will usually be the same,
feature is that the sleeve I‘! should ?t relatively the width being slightly wider’ than the width of
the backing strip assemblage and the length being
loosely about the rod 2!, by which it is inci
to cause the trailing end to slightly
dently supported. The supporting engagement is sui?cient
overlap the advance end, in case only one length
effected by endwise engagement between margin of abrasive is used, as illustrated on Fig. 3.
75 i8’ and track 23, as regards the upper engage
As shown in Fig. 3 the advance end of the
45
50
60
75
3
2,132,600
abrasive strip 25;‘ which, is, indicated at 26, is would be the reverse. Hence, it is essential to
loopedabo'ut the advance end l6 of one of the
' backing strips’ IS with the inner portion 2ldis
posed between the outermost strip [5 and the
next innermost strip Hi, the contracting tension
‘ of the strips serving to hold the folded or looped
and without requiring any actual fastening
, means.
However, a ‘fastening means is shown
in Fig. '7, which may consist of a. U -shaped sheet
this invention that the free ends of the backing
strips be in advance of the trailing ends thereof.
. Now it will be clear that frictional drag gen
erated on the abrasive strip will cause the back
ing strip to which it is attached, to bow radially
outwardly in such an effective manner that
abrasivepressure against the cylinder wall will
be substantially uniform throughout the length
of the ‘strip, and this is true irrespective of 10'
folded advance end of the abrasive strip, and whether the abrasive strip is of suf?cient length
which: may be used instead ofthe expedient to overlap as shown in Fig. 3. The importance
shown‘. in Fig. 3. Therefore, hereinafter, wher-V of this pressure advantage will be realized when
ever I use the term “connected” in reference to emphasis is laid to the fact that the expanding
elements are circumferentially spaced and hence
15 'the'arelation ofthe advance end of the abrasive if it were not for this bowing of thebacking strip,
Stripandbacking strip, I mean merely any ex
pedient that will serve to hold the advance end and the multiplicity of thicknesses of backing
strips, the pressure engagement would possibly
of’ the abrasive strip on the backing strip. '
- The'remainder of the abrasive strip 25, ‘which not be as uniform between the expanding ele
V20 extends about. the periphery of the backing strip ments as abreast of the same. Now if the direc
assemblage, and wherein the extreme trailing tion of rotation were in the opposite direction
from that indicated in Fig. 3, with the hinged
end is-shown at 23, is entirely free and uncon
nected with they assemblage of backing strips “or sleeved end of the backing strips foremost,
then, the tendency would be for the backing '
and presents its abrasive face against the cylin
strip connected with the abrasive strip to pull
‘der walliin an effective manner to smooth or re
away from the cylinder wall, especially since the
ducethe same. However, in practice, Iv have suc
cessfully used an abrasive strip less in length backing strip normally tends to contract toward
thanithe circumference of the cylinder wall to be
It will alsobe seen that when the expanding
I; It is not necessary that a single abrasive strip elements are expanded, irrespective of the di
be used as relatively short abrasive strips may be ameter to which the device‘ has been adjusted,
10 of ,metal28 which may be clamped about the
a smalleridiameter.“
treated.
,
connected with the ends of several or all of the
backing strips if , desired, with the trailing end
ofione strip overlapping the advance vend of an
; other strip, although thisis not necessary to a
successful operation. I have found that when I
employ one. abrasive strip the remaining back
ing. strips 'actmost effectively’ when expanded in
. holding the abrasive strip into sustained and
.In Figs..8 and 9 I have shown a form of abra
slve:.strip designated at 30, which is of emery
and especially adapted for heavy duty service,
the emery or like‘surface' being indicated at, 3|,
and thefoundation at 32. It is a feature of .this
abrasive that it is self-clearing with respect to
emery or metal. particles and this is accom
plishedby providing the surface 3| with a series
of grooves 33. These grooves extend at a slight‘
angle .to the length of the. strip so that ‘at all
times; the abrasive surface 3| will present an
‘effective area to the wall of the cylinder. It will
readily be apparent that if the grooves extendedv
' longitudinally of the strip, or at right angles to
its length, the abrasive surface would be inter
rupted bythe grooves in the ?rst instance, and
in the‘ second instance, the grooves would not be
' self-clearing. ‘It. is therefore desirable to‘ groove
the strip ‘substantially longitudinally or nearer
a‘lengthwise disposition. than any other dispo
‘
.
.
1
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there will be a multiplicity of thicknesses of
backing strips into engagement with the cylin
der wall and this increases the efficiency of the .
device in achieving uniformity of pressure en
gagement of the abrasive element with the cylin
der wall. This is true ‘irrespective of whether
one abrasive strip is used, as shown, or whether
short abrasive strips are attached to thevback
ing strips.
[uniform engagement withthe cylinder wall.
sition.
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It will also be clear that when the device is
inserted into a cylinder, it will center'itself auto
matically by reason of the pivotal connection
through which rotative thrust is imparted, and
that thebacking strip assemblage -is free to
assume a cylindrical position in the cylindrical
portion of .the cylinder, or a tapered position in
the lower tapered portion of the cylinder. Fur;
ther, after the tapered portion has been ground
to’cylindrical form, by the use of a heavy duty
abrasive, .or as it is being so changed, the as
semblage willgradually change back to a cylin
drical form automatically.
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It ‘will be. seen that theassemblage of backing
strips I5, which de?ne a cylindrical abrasive
backing, are loosely assembled because of the
play afforded the rods 2|, in sleeves l1, and that
the assemblage is semi-floatingly mounted‘ by
reason of the fact that the rods 2| are pivoted
between their ends to adjusting bars 6 and are‘
thereforev equalizing bars which insure uniform“
pressure engagement of the abrasive with the
__While,the operation may be clear from the
foregoing, it will be brie?y described as follows; cylinder wall irrespective .of whether the as—,
.When thedevice is lowered into the cylinder, semblage assumes a cylindrical or tapered form.
It is believed that the invention will be fully 65» Y
the expanding elements are contracted and after
insertion, the elements are expanded to dispose understood from the foregoing description, and
the abrasive into engagement with the wall of while I have herein shown and described one
. the cylinder, with a fairly light pressure.
speci?c form of the invention, I do not wish to
Thenrotativethrust is applied to spindle I to be limited thereto except‘ for such limitations as
to rotate thev device in a clockwise direction the claims may import. >
whereby the free advance ends of the backing
strips 15 will be'in aforward relation to the
trailing sleeved ends 11, with respect to this di
rection of rotation.
Of course, with a contra
783 clockwise direction of rotation, the relationship
I claim:
I
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i. In a cylinder smoother and emery-removing
device, a rotatively driven spindle, a pluralityof
propulsive expanding cam bars pivoted thereto, a
cam adjustable on said spindle for expanding or
4
2,132,600
permitting contraction of said bars, a backing
strip supporting and equalizing rod for each cam
bar and said rods being pivoted to their respective
bars between the ends of said rods whereby said
rods may assume a concentric or tapered relation
to said spindle, a substantially cylindrical re
silient backing strip for each rod and each strip
having an advance free end and a trailing pro
pulsive end with respect to the direction of rota
10. tion of said device, and the propulsive trailing
end of each strip being pivotally sleeved on its
respective rod and said backing strips being dis
posed 'in' circumferential overlapping relation
about said spindle and being tensioned to nor
15 mally contract to the smallest diameter, where
by an abrasive strip may be connected with the
free end ‘of one of said backing strips and ex
tend about the remaining backing strips in free
trailing relation for uniform engagement with
20 the cylinder wall.
2. In a rotary cylinder smoother and emery
removing device, a plurality of expansible re
whereby friction drag against the forward end of
said abrasive strip will bow said backing strip
radially outwardly and cause a uniform pressure
engagement of said abrasive strip against the
cylinder wall throughout the length of said
abrasive strip.
.
5. In a rotary cylinder smoother and emery
removing device having spaced expanding .ele
ments, a resilient backing strip having free ad
vance and following ends with respect to the 10
direction of rotation of the device and ‘the fol
lowing end of said strip being propulsively con
nected with one of said elements and said strip
having a length forming less than a complete
circle, and an emery abrasive strip havingv one 15
end thereof connected to said free advance end
of said backing strip and the remainder of said
abrasive strip trailing freely abreast of the
radially outer face of said backingstrip for en
gagement with the cylinder wall when said ele
ments are expanded, whereby friction drag
against said abrasive strip due‘ to propulsion of
silient backing strips of substantially cylindrical " the rear end of said backing strip will bow the
form and in circumferentially overlapping rela
tion to afford a plurality of backing thicknesses
at any diameter and said strips being tensioned
to normally contract toward the smallest diam
eter and each strip having an advance free end
and a propulsive trailing end with respect to the
30 direction of rotation of the device, a propulsive
rod loosely andpivotally sleeved in the trailing
end of each strip whereby the overlapping strips
will form a relatively loose assemblage capable
, of assuming a concentric or tapered form about
the axis of rotation, whereby an abrasive strip
has one end connected with one advance end of
one of said backing strips and the remainder of
the abrasive strip trailing freely about the strip
latter outwardly and cause a uniform‘pressure
engagement of said abrasive strip with the cylin
der wall throughout the length of said abrasive
strip.
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6. In a rotary cylinder smoother and emery
removing device, an expansible mechanism
adapted to be rotated in a cylinder, a backing 3.0?
strip having its rear end, with respect to rotation,
propulsively connected with said-mechanism and
its forward end free, and an abrasive stripihav
ing one end connected with the free end of said
backing strip and the remainder trailing abreast 351
of said backing strip for engagement with the
cylinder wall when said mechanism is expanded,
whereby friction drag against said abrasive strip
assemblage for engagement with, the wall of the due to propulsion from the rear end thereof will
bow said backing strip outwardly and lengthwise
40 cylinder, and mechanism inside said strip as
semblage and pivotally connected with said rods ‘tension said abrasive strip and cause uniform 40.
for expanding and propelling said assemblage.
engagement of the latter against the. cylinder
,3. In a rotary cylinder smoother and emery
removing device, a plurality of expansible re
7. As a new and usefularticle of manufacture
45 silient backing strips of substantially cylindrical of the class described, a substantially cylindrical
form and in circumferentially overlapping rela
resilient backing strip having an advance free
tion to afford a plurality of backing thicknesses end and a following propulsive end with respect
at any diameter andsaid strips being tensioned to its intended operative direction of rotation,
to normally contract toward the smallest 'diam
said propulsive end having a propulsive connect
50. eter and each strip having an advance free end ing means, and an abrasive strip having one end 5.01
and a propulsive trailing end with respect to the connected with said advance end of said backing
direction of rotation of said device, an abrasive stripv and the remainder of said abrasive strip.
strip having one end connected with one ad
being otherwise free from connection with and
vance end of one of said backing strips and the trailing abreast of said backing strip toward the
wall.
remainder of said abrasive strip trailing freely
about the strip assemblage for engagement with
the wall of the cylinder, and mechanismopera
tively connected with the propulsive ends of each
backing strip for rotating and expanding the
60 strip assemblage.
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4. In a rotary cylinder smoother and emery
removing device having circumferentially spaced
expanding elements, a substantially cylindrical
resilient backing strip having an advance free
.65 end and a following propulsive end relative to the
direction of rotation of said device and the pro
pulsive end being hinged to one of said expanding
elements to dispose the radially inner face of said
strip abreast of said elements, and an emery
70 abrasive strip having one end thereof connected
with the advance free end of said backing strip
and the remainder of said abrasive strip trailing
abreast of the radially outer face of said backing
strip for pressure engagement against the wall
75. of the cylinder when said elements are expanded,
,
propulsive end of the latter;
.
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8. As a new and useful article of'manufacture
of the class described, a substantially cylindrié
cally shaped resilient backing strip having an
advance free end and a following propulsive end
with respect to its intended operative direction 60:
of rotation, said propulsive end having one mem
ber of av hinge connection, a rod forming there
maining member of a hinge connection with ‘the
propulsive end of said strip, and an emery abra
sive strip having one end connected‘ with said
advance end of said backing strip and they re-‘
mainder of said abrasive strip being otherwise
free from connection with and trailing abreast
of said backing strip toward the propulsive end
of the latter.
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4
9. In a cylinder smoother and emery remover,
a device having a plurality of expansible rods, a
cylindrically shaped backing strip having an
advance free end and a following propulsive end
and the latter having a portion for coaction with 75
5
2,132,600
one of said rods to form a hinge connection, and
an abrasive strip having one end connected with
said free advance end of said backing strip and
the remainer of said abrasive strip trailing freely
abreast of the outer face of said backing strip for
engagement with a cylinder wall.
10. In a rotary cylinder smoother and emery
removing device, a driving spindle, a cam bar
pivoted to said spindle and having a cam track,
10 an expansible backing strip-extending about said
spindle and having a sleeve provided with an
opening, a rod in said sleeve having a pivot lug
extending through said opening and pivoted to
said bar and said rod having a cam track forming
15 a contiguous extension of the cam track of said
bar irrespective of the degree of expansion of
said strip, and an adjusting cam on said spindle
for coaction with the cam track of said bar and
the cam track of said pivot lug.
11. In a rotary cylinder smoother and emery
removing device, a relatively loose assemblage of
?exible abrasive backing strips of substantially
cylindrical form and in circumferential over
lapping relation to afford a plurality of backing
thicknesses and de?ne a substantially cylindrical
abrasive backing at any diameter and each strip
having an advance free end and a trailing pro
pulsive end with respect to the direction of rota
tion of the assemblage, the free end of at least 10
one strip being adapted for connection. with one
end of an abrasive strip with the remainder of the
latter trailing about said assemblage for engage
ment with the wall of the cylinder, and mecha
nism in semi-?oating connection with said back 15
ing strips near the propulsive ends thereof for
rotating and expanding said strip assemblage.
GEORGE C. BECK.
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