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Патент USA US2411633

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yNOV- 26, 1946`
` " ' A. oBERHoLTZ, JR
'
ABRASIVE
2,411,533
BEAMER
Filed Dec. 21, 1942
1
. \
Y
76
'
JNVEN
ToR.
ANTHo Y oBERHo rz,./R.
BY
AT TORNE Y.
-
2,411,633
Patented Nov. 26, 1946
UNITED STATES PATENT OFFICE
2,411,633
'
ABl'tAslvE BEAMER
Anthony Oberholtz, Jr., Los Angeles, Calif.
Application December 21, 1942, Serial No. 469,590
IZ Claims. (Cl. 51-1843)
1
.
This invention relates to improvements in
abrasive reamers of the type illustrated in United
States. Letters Patents 1,841,343, 1,910,658 and‘
1,910,659; although the teachings of the present
invention may be employed with equal advantage
in connection with other types of honing and
reaming devices.
'o
It contemplates more especially the provision
of improved means for increasing the range of
bore sizes that may be honed. or reamed, and
more particularly enables muchL smaller bores to
be honed Without sacrificing the large range of
bores with the same tool serving the entire range.
Physical limitations in strength of blades and
2
are rigidly supported for substantially their en
tire length so that the reamer will ñnish a hole
exactly true even under forced operations in an'
increased range of honing sizes.
A further object is to provide a reamer With a
readily detachable micrometer adjustment that
will not limit or define the Aminimum size of hon
ing attaina le with any reamer unit of wide size
range.
A still further object is to provide an improved
blade structure for an. abrasivereamer thaty corn
bines rigidity with overall size rdiminution and
interchangeability with blades of standard size
range,
-
-
,
Still a further object is to prov-idean increased
moving parts primarily controlled the size of the 15 length blade `with aj minimum honing size diam
bores that could be advantageously bored or
roamed with a single tool. Strength and full sup
port of the blades is essential or at least desirable
in that such is conducive- to precision operation
over an extended period or the life o_f the tool.
Reduction in the diametric size of the blades
eter to accomplish v rigidity and increased size
honing range with aV reamer of single reamer unit.
Other objects and advantages will appear from
the following description of an illustrated em
bodiment of thepresent invention.
In the drawing:`
without weakening the strength thereof is> the
limitingk factor in the size range. To weaken the»
blade structure Wou1d,` when the operator forced~
, .
`
Figure 1 is averticalside view in elevation and
partiallyin section of an abrasive reamer em
bodying
features of the present invention.
25
, the enlarging adjustment too vigorously,_¿distort
the blades and the~ honing operations would be
inaccurate,> not circularly true, and unsatisfactory
from a. mechanical standpoint.
_
Rigidity o_f blade _structure is important and to
accomplish dependable, satisfactory honing oper 30
ations over extended periods, increased honing y
size range should not'be accomplished to the det
riment of' rigidity orraccuracy. This presents a
problem; of combining normally oiîsetting fea-l
tures, namely, increased> rigidity tends to deter
mine minimum size limits of the honing blades.
The teachings of the present invention has. ac
complished an increased range of honing opera
tions. without sacrincing rigidity and honing ac
Figure 2 vis a vertical edge enlarged sectional
View in elevation taken substantially along line
II-II of Figure 1.
'
»
Figure 3 is an enlarged side fragmentary viewy
in elevation of the adjusting end of the reamer
with the shoes or blades assembled therewith, the
detachable micrometer adjusting instrumentali
ties being shown in dotted outline.
Figure 4 is a side sectional view of the other
end of one of the blades or shoes taken substan
tially along line IV-IV of Figure 2.
'
Figure 5 is a side view in elevation of the mi
crometer adjusting deviceV that is detachably as
sociated with the end of the reamer and shown
40 in dotted outline in Figure 3.
Figure 6' is an enlarged fragmentary side view
One object of the. present invention is; to pro
in elevation of the adjusting vend of the reamer
vide an abrasive reamer construction inwhich
with one blade abrasivev shown in section and the
shoes or blades of widely different> diameter or
other in full outline.
size may be substituted quickly and conveniently,
Figure '7 is a section of view taken substantially
so that‘but one reamer is required fora wide size
along line VIl--VII` of Figurey 2, one edge of an
rangefof honing operations.
abrasive liner being shown unattached.
Another object is to kprovide an abrasive reamer
Figure 8 is a sectional view taken substantially
construction having a diametral expansion which
along
line VIII-_V111 of Figure 2.
'
f
can bey accurately and reliably gauged by almi-`
crometer adjustment. to a small lfraction. of a 50 Figure 9 is an edge view in elevation of the
curacy.
Y
'
‘
smaller blade size construction compared to the
larger
size blade construction shown in Figure 1.
serving as an obstruction- to small size honing
Figure l0 is a plan view- of the improved small
diameters.
blade shovvn> in Figure 9.>
Still another objiect. is to provide an abrasive 65 size
The structure selected for illustration isì not
reamer, the expanding shoes. or bladesÍ of which
thousandth part oi an inch Without the latter
2,411,633
3
intended to serve as a limitation upon the scope
or teachings of the invention, but is merely illus
trative thereof. There may be considerable varia
tions and adaptations of all or part of the teach
ings depending upon the dictates of commercial
practice. rThe present embodiment comprises a
body l@ with flat parallel sides II and tapered
edges l 2 providing a large end I3 and a small end
I d or" the convergingly tapered body Ill.v
rI’he small body end I@ terminates in an elon
gated threaded extension I5 over which a bearing
sleeve le is disposed to extend short of its length
to accommodate a retaining end nut l‘l against
the sleeve I6. The retaining nut il' is somewhat
larger in diameter than the bearing sleeve I6
which receives a substantially larger collar I8
thereover to freely rotate thereon against end
displacement precluded by a composite fiber and
steel washer l2 which is somewhat smaller than
the collar i8.
'
To this end, the retaining nut Il has a dia
metrically extending screwdriver blade receiving
4
socket 22 in the collar I8 is confronted by a simi
larly concavely cupped blade receiving socket 31
provided in a blade retaining collar 38, which has
a bore 29 therethrough to receive the driver shank
' 23 therethrough and provide freedom of move
ment so that the retainer 38 will be free floating
for support by a spring 49.
The spring 4l) is of a standard, convolute type
which envelopes the driver> shank 2.3 between the
ñxed coupler member 2l and the floating blade
end retainer 3S to urge the latter in the direction
of the confronting blade receiving socket 22 in the
collar I8.
A plurality of emery cloth supporting blades
40C-lll, in this instance two, are shaped as coin
plements of each other and the tapered body I0
-for retention between the end capped sockets
22-31 through the urge of the spring 2li. To
this end the blades [MV-4I have arcuate projec
20 tions lS2-ll3 and ¿M_-¿l5 provided at their ex
tremities to conform in curvature, size and shape
`with the capped sockets 22-31 for retention
slot 20 therein to provide for the rotation thereof
therein when the tapered body Il) is received in
relative to the threaded extension I5.
oppositely and complementally inclined grooves
The collar i8 has an enlarged peripheral ex 25 46~4l provided in the confronting surfaces of
terior rounded shoulder 2l that is concavely end
the blades diy-4I throughout the length thereof.
cupped as at 22 to receive complementari end
This enables the blades ¿lV-2| to be seated
blades therein as will appear more fully herein
throughout their entire length on the inclined
after. A rectangular driving shank- 23 extends
edges I2 of the `body I0 with the spring 40 nor
from the large end I 3 of the tapered body liì to 30 mally urging them toward the collar I8 to assume
terminate in a polygonal body 24 which is adapted
their minimum diameter expansion so long as
to be placed in a chuck constituting a part of a
the spring 40 is unopposed except for the collar
power turning tool, such as a portable electric
i8' and its'retainer nut I 1 serving as a stop
drill. The polygonal body 24 has an enlarged
end _25, which has a substantially rectangular 35 A counter urge or force applied to the collar I8
socket 26 provided therein of somewhat larger
will cause the blades 46h-¿Htc ride along the
size than the end of the driving shank 23 to per
diverging edges I2 of the tapered body il! to eñ'ect
mit a limited degree of play or pivotal movement
their expansion or recession from each other,
therefor.'_
therebetween in all directions. '
The enlarged cylindrical end 25 of the polygo
'
/
v
while the spring 40 is compressed to a correspond
40 ing degree. vIn this manner, the size of the bore
nal driver 2li is retained in loose association with
to bve-honed can be predetermined by limiting the
the free extremity of the driver shank 2B by
extent to which the collar I8 and the blades
means of a coupling comprising a cylindrical cap
dll-_4I are displaced along> the inclined body I0
21 that` has a central bore 28 somewhat largerv
in’thejdirection of the driver 24, which is simul
than the reduced shank 29 of the driver 24 and 45 taneously rotated by a power instrumentality,
its Aenlarged end 25. The coupler cap 2l has an
such as a standard portable electric drill.
enlarged peripheral flange 3d that is comple
It should be noted that the tapered contact
mental to the cylindrical coupler member 3l that
between the cuppedA socket ends 22-31 of the
is press iitted in the open bore 32 deñned by the
confronting members lf3-«38, respectively, serve
peripheral flange S0, thereby maintaining the 50 to hold vthe complemental blades or shoes IIIV-¢1I
driver 24 in loose association with the driver
together with their tapered channels or grooves
shank 23 in that the cylindrical coupler member
¿iS-_41 in full contact with the taperededges I2
3! has its closed end 33 bored as at Se for press
of the body I0 for the entire length of the blades
fitted engagement with the driver shank 23, to
or shoes ¿lV-4 I. The channels or grooves 4-6-47
establish its rigid joinder therewith.
in the complemental blades 4ß'-4| have a close
_The coupler member 3l is ñtted to the driver
but free slidable ñt against the edges I2 and
shank ¿23 in a position to provide a limited space
flat sides II of the body Il).
35 between the driver shank end and the bottom
It should be noted that thegretainer end I‘I on
of the socket 2li provided in the driver end 25.
the'lbody extension I5 serves to limit the extent
This allows the driver 24 to move axially on the 60 to which the blades or shoes ¿6L-4I may be dis
driver shank 23 and pivotally to a slight degree in
placed along the tapered body I0, and a calibrator
all" directions owing to the fact that the socket
is provided therefor to limit `the extent of dis
2S is somewhat larger than the driver shank 23
placement of the lbla-des INV-4I and their relative
and the enlarged driver end 25 has an exterior
expansion to 'denne a predetermined diametrical
diameter Y somewhat smaller than the interior 65
honing
size, to which a bore will be ñnished by
chamber 35 of the coupler member 3l, so that
the abrasive action of abrasive sheets 43-49 that
limited universal movement is permitted between
are detachably associated with the blades or shoes
This
the driver
minimum
shanklimited
23 and movement
its polygonal
is driver
desirable
lily-4I. ,To this end, the abrasive sheets ¿S8-49
are provided with substantially U-shaped edge
owing to the fact that true honing can be accom 70 re-enforcing cleats 5Fl-5I that are clinched to
plished >even though the operator holds the driven
the side edges of the abrasive sheets 48-49 to
end somewhat out oi alignment with the power
driver, such as a portable electric drill, as will
serve as attaching expedients therefor in con
junction with the blades or shoes 40’-4l.
appear more fully hereinafter.
The cleats Sli-5I tightly ñt into side grooves
The concavely end cupped blade receiving 75 52-53
provided in the parallel side walls 54--55
2,411,583
of each of the'complemental shoes 40’--4I. The
6
the maximum relative :recession or expansion of '
the blades or shoes 4û'---4I and thus determines
side grooves or channels 52.--53 extend substan
the honing diameter of the finished bore.
tially for the length of the blades or shoes 4I|’---4I
The micrometercollar 62 may be calibrated to
proximate to the curved or arcuate abrasive
sheet supporting surfaces 56 that constitute the 5 any desired scale, but it is preferable, though not
essential, to -Ioe graduated in .0025v inch and the
external operating surfaces over which the abra
pitchof >the threads on the stop screw 10 and
sive sheets 48-49 are tensioned for support.
meshing threads 13 are such that one complete
This renders the abrasive sheets 48-4‘9 together
turnv of the stopI screw 10 is> .005 inch. Other
with their cleats `5Íl---5I removable for replace
graduations or calibrations may be utilized, vbut
10
ment with new abrasive sheets of corresponding
thisis
preferred.
size and structural characteristics.
In' adjusting the work to the hone, the stop
Now, then, in order to adjust the -blades 4Il’---4I
screw 10 is screwed out so that theblades or
with their abrasive reaxning or honing surfaces
shoes INV-_4Ik and their abrasive covers 48-49
48-49 to the desired bore to accomplish the best
results and to effect a predetermined expansion 15 are expanded to ñll snugly the hole or bore to be
honed, then the stop screw 10 is screwed in until
thereof to impart the desired finishing size, an
its tip 1I will just touch the retaining nut I1
elongated exteriorly knurled end bearing or man
while the manual handle sleeve 51 is held against
ual handle sleeve k51 has .one of its open extrem«
the tension of the spring 4i). The hone blades
ities 58 interiorlysized as at~59 for substantially
HIV-4I with their abrasive covers 48-49 are now
the length of the collar I8 to freely fit thereover
set to the size of the hole or bore. Thereafter,
for rotation relative thereto without any appre
the stop screw 10 is adjusted by turning the
ciable looseness or play therebetween. The in
micrometer collar 62 in one or a repeated series
terna-l end bore 59 of the manual handle sleeve
of steps to the desired extent to which the hole
51 which fits over the collar I8, terminates in a
or bore is to be finished.
peripheral shoulder 50 deñned by the somewhat
Assuming the hole or bore is to be enlarged .003
smaller interior bore 5I that communicates with
inch,
the stop screw 10 is backed out .003 inch,
a somewhat larger collar bore 59 to denne the
and -the lock nut 14 is then screwed to engage the
Y
micrometer collar -62. With the driver member
The peripheral shoulder 60 contacts the corn
posite thrust washer and limits _the inward move 30 25 in the chuck of the power drill that is held se
curely in a vise„the power is started to turn the
ment of the manual handle sleeve 51 relative to
hone body l!! with its -blades 4ll-4I and abrasive
Ithe collar I8, so that the sleeve edge 58 meets
covers >Ail-»119. `Force is then'> applied on the
with the rounded peripheral shoulder 6I! at the
cupped end of the collar I8, thereby providing f knurled manual handle sleeve 51 to expand the
while the high speed rotation thereof gradu
contact along the peripheral shoulder 5B and the 35 hone
ally cuts the bore to the size by continuing the
open peripheral extremity 58 of the manual han
force or pressure on the sleeve 51 against or in
dle sleeve -51 with the collar I8 and its thrust
the direction of the driver 24. The end :surface
washer I9.
.
, ’
15 of the enlarged head 12 on the stop screw 1II
A calibrated micrometer >collar 52 is journalled
on a reduced extremity 63 of the ymanual handle 40 can be held against they operator’s body to steady
the rotation while the work is held stationary in
sleeve 51 for rotation relative thereto, it being
the operator’s hand relative to the rotating
retained thereon by an interna1 split spring 64
yabrasive surfaces 48-49 that are supported by
confined in an annular slot'65 of which comple
the blades or shoes 40’--4I. This force is con
mental >portions are in the confronting surfaces
of the micrometer collar 62 and the sleeve ex 45 tinued or progressively applied until the Astop
screw -10 has its tip 1IA in contact with the re
tremity 63.
'
tainer-'nut I1. This determines the predeter-v
Consequently, the micrometer collar 62 is con
mined
size of the honed bore.
nected to and rotates relative to the manual han
In order to hone bores that are smaller in di
dle sleeve 51. The micrometer collar -52 has an
inwardly extending peripheral flange 66 at the '50 ameter than the manual handle sleeve 51 and
the stop screw 10 preferably having an enlarged
outer extremity thereof to re-enforce the knurled
knurled head 12, the manual handle sleeve 51 is
peripheral edge 61 and t0 present a radially ex
detachably associated with the collar I8 so that
tending longitudinal rib 68 serving asa key dis
the hone I0 with its predetermined size of blades
posed in a slot orv keyway 659» provided in and
along an elongated stop screw 10 for >the entire 55 40’--4I may be displaced through the bore of the
work, and thereafter the manual handle sleeve 51
length thereof between a reduced inward tip1 stop
replaced with its stop screw 10 and enlarged
1I and an outward enlarged knurled head 12
knurled head 12 having a smooth curved surface
serving as a turning expedient for the elongated
tubular manual handle sleeve 51.
stop screw 10.
With this arrangement, the stop screw 10 ro
15 serves as a suitable stabilizing influence when
60 t’hebody of the operator is held thereagainst. It
should be observed that the manual handle sleeve
tates with the micrometer collar 52 While in
threaded engagement with an inwardly projected
51 serves as a manually supported end bearing
threaded cylindrical wall 13 provided in the ex
treme end region 63 of the manual handle sleeve
51. A retaining or lock nut 14 threadedly en
gages the stop screw 10 above the micrometer
which is removably and rotatively associated withv
collar 62 to retain it 'in adjusted position relative,
the collar I8 for unobstructed attachment and de» ,
tachment therewith as part of the hone body ,i5
to fully accomplish the specified function and Y
purposes therefor. For instance, this arrange
f to the manual handle sleeve '51 so that the latter
ment >permits the manual handle sleeve k5.1 to :be
» may be displaced with the collar I8 and ¿blades 7_0 removed in the ordinary use of the -device to per»`
or shoes dll-4I a predetermined distance in the
mit a bore of a wrist pin or a bea-ring comprising,
ydirection‘o'f the driver member ¿24 lto ‘compress
the spring ,4G until the stop screw tip 1I engages
the retaining nut I1 and this limits any further
a vpartiof any other structural part or device to
be passed over the abrasive sheets .A8-#49 `on the
body Hl and, thereaftenthe manual handle‘sleeve
displacementof the lblades or shoes -4Il’--4I rel: l 75 51 is replaced on the body Íend orco'llar `I8,'there-»
ative to the `tapered hone kbody ID. This limits
2,411,633`
7
by enabling the honing of much smaller bore di
ameters than is otherwise possible.
So that full advantage may be acquired through
8
understood that the `invention is capable of con
siderable variation and modiñcation without de
parting from the spirit of the invention. I, there
the use of a detachable manual handle sleeve Fil',
fore, do not wish to be limited to the precise de
an improved blade structure has been provided 5 tails of construction set forth, but desire to avail
that takes care of the smaller bore diameters with
myself of such variations and modifications as
out'req'uiring a smaller size hone body l0 to which
come within the scope of the appended claims.
rigid, thick, standard blades or shoes ‘WL-él are
I claim:
adaptable to this end a much longer blade it
l. In an adjustable abrasive hole-finishing cut
(Figure 9) is utilized, so that the elfective abra 10 ting tool, the combination with a body, of a plu
sive cover supporting length ‘il from the tip M’
rality of abrasive sheet supporting shoes adjust
to the shoulder 45’ can be thinned down below
ably associated with said body, actuator means
the limits of the required rigidity to accommodate
the same channel or groove 45’ therein. By thin
ning down the' effective abrasive surface Ti,
smaller diameters are provided and still the same
channel or groove 46’ is accommodated at the
expense of strength and rigidity at this portion;
however, the increased length of the blade 16
provides an inoperative and appreciably heavier
portion 18 between the shoulder 45’ and the ex
treme vextremity 45", which compensates in
strength for the weakened reduced portion 'l'i
interposed between said body and said shoes for
expanding and contracting said shoes relative to
each other, means on the end of said body for op
erating said actuator means, an unconnected end
bearing removably and rotatively associated With
said body for unobstructed operative attachment
and inoperative detachment therewith to serve as
a manual handle sleeve and calibrated means on
said end bearing said calibrated means cooper
ating with said actuator means to control the ex
pansion of said shoes to a predetermined limit
that determines the minimum size bore that can
from an initially set relative position.
be honed below that which was possible with the 25
2. In an adjustable abrasive hole-nnishing cut
uniformly shaped blades or shoes flû’~4l.
ting tool, the combination with a body, of a plu
In- the thinned down portion Tl, which carries
rality of abrasive sheet supporting shoes adjust
the abrasive covers L18-‘19, the inclined channels
ably associated with said body,`actuator means
d6’ therein approach thev outer surface to an eX
interposed between said body and said shoes for
tent that an opening 'i9 occurs therethrough just 30 expanding and contracting said shoes relative to
in front of the shoulder 45', but the increased
each other, means on the end of said body for cp
thickness of the ineifective honing portion 'iii pro
erating said actuator means, an unconnected end
vides the necessary strength to compensate there
bearing removably and rotatively associated with
for and the comparative weakness of the thinned
said body for unobstructed operative attachment
down portion 1l. ~
35 and inoperative detachment therewith to serve as
It should be noted, however, the blades or shoes
a manual handle sleeve and calibrated means on
16 of increased length are accommodated by the
said end bearing, said calibrated means cooperat
samehone body l0 owing to the fact that in the
ing with said actuator means to control vthe eX
smaller diameter blades or shoes 15,'the effective
pansion of said shoes to a predetermined limit
honing surface l1 is appreciably shorter than for 40 from an initially set relative position, said last
the blades dill-¿I of standard'and uniform thick
named means comprising a sleeve journalled for
ness throughout. In the smaller diameters to be
rotation relative to said actuator means, a gradu
honed, the length is notl an important factor and
ated slip collar on said sleeve, and a stop pin ad
for that reason correspondingly shorter abrasive
justably connected to said sleeve through said
covers are provided which are constructed similar 45 graduated collar.
to the abrasive covers 48-49 and engage in cor
3. In an adjustable abrasive hole-iinishing cut
responding side slots T9 provided for the effective
ting tool, the combination with a body, of a plu
length Ti of the blade or shoe 76.
`
Two complemental blades 75 of smaller shape
and size, are carried by the tapered hone body
edges I2, and the eiîective honing portion 'Il of
the blades or shoes 76 are provided proximate to
the insert end of the hone body lll corresponding
with the collar i8 which is cupped as at 22 to re
ceive the corresponding end 44’ of the blade or
shoe 16.
~
rality of abrasive sheet supporting shoes adjust
ably associated with said body, actuator means
interposed between said body and said shoes for
expanding and contracting said shoes relative to
each other, means on the end `of said body for
operating said actuator means, an unconnected
end bearing removably and rotatively associated
with said body for unobstructed operative attach
ment and inoperative detachment therewith to
It will thus be app-arent that the combination
serve as a manual handle sleeve and calibrated
of improved blade or shoe structures 16 for small
means on said end bearing, said calibrated means
holes or bores together with the detachable speed
cooperating with said actuator means to con
sleeve 5l, provides a greater range of honing sizes 60 trol the expansion of said shoes to a predeter
for the body i0 than was heretofore possible
mined limit from an initially set relative posi
owing to limitations determined by the speed
sleeve and its adjusting head, as well as the de
sign of the blades or shoes ASL-4H for any given
hone body Iû.
,
It should be observed that different sizes in the
uniformly shaped blades or shoes ddl-4E, as well
as in the irregularly shaped blades or shoes 'l5
for smaller hones, are provided so that a range
of hole diameters or bores of appreciably larger 70
and smaller size limits can be effectively honed
without requiring more than one hone body lll
tion, said end bearing comprising a sleeve jour
nalled for rotation relative to said actuator
means, a graduated slip collar on said sleeve, a
stop pin adjustably connected to said sleeve
through said graduated collar, and means inter
posed between said collar and pin toinsure their
connected rotation as a unit while permitting the
longitudinal -displacement of said 'pin through
said collar.
4. In an adjustable abrasive hole-finishing cut
ting tool, the combination with a-body, of a plu
rality
of abrasive sheet supporting shoes adjust
While I have lillustrated and described a pre
ably associated With'said‘body, actuator means
ferred> embodiment of this invention, it must be 75 interposed
between said body and said shoes for
and its auxiliary parts.
anregen
eff
tapered faces andshoes provided with abrasive
expanding andfcontractingsaid shoesv relative to
members fitting thereon, cupped member on said
each other, means on rtheïend of said body for
operating said actuator means, an unconnected
end bearing removably and ïrotatively associated
body and iitting over the ends of said shoes to
retain said shoes around said body, a spring posi
tioned upon and along said body to bear against
one of said cupped> members, an adjusting niem
ber'threadedly engaging said body and adapted
with said body for unobstructed operative attach
ment and inoperative‘detachment therewith to
serve as a manual handle sleeve and calibrated
means on said end bearing, said rcali-brated means
to bear against'v the other cupped member, an un
connected' calibrated manual hand end bearing
cooperating with said actuator means to control
supporting sleeve removably and rotatively asso
the expansion of said shoes to a predetermined 10 ciated with said adjusting member for unob
limit from an initially set relative position, said
structed attachment and detachment therewith
end bearing comprising a sleeve journalled for ro
to serve as a manual handle sleeve end support
tation relative to said actuator means, a gradu
and stop for said adjusting member, said cali
ated slip collar on said sleeve, a stop pin thread
brated speed sleeve including a slip collar, a stop
edly connected to said sleeve through said grad 15 screw extending through said slip collar and
uated collar, and a key andkey-way interposed
threadedly engaging said speed sleeve, comple
between said collar and pin to insure their con
mental means on said collar and screw to insure
nected rotation as a unit while permitting the
their combined rotation while permitting relative
longitudinal displacement of said pin through
said collar.
5. In a cutting tool having a. central body with
20
axial displacement therebetween.
_9. In a cutting tool having a central body with
tapered faces and shoes provided with abrasive
members fitting thereon, cupped member on said
tapered faces and shoes provided with abrasive
members ñtting thereon, cupped member on said
body and iitting over the ends of said shoes to re
body and fitting over the ends of said shoes to re
said shoes around said body, a spring posi
tain said shoes around said body, a spring posi 25 tain
tioned upon and along said body to bear against
tioned upon and along said body to bear against
one of said cupped members, an adjusting mem
one of said cupped members, an adjusting mem
ber threadedly engaging said body and adapted
ber threadedly engaging said body and adapted
to bear against the other cupped member, an un
to bear against the other cupped member, and an
connected calibrated manual hand end bearing
unconnected calibrated manual hand end bear
supporting sleeve removably and rotatively asso
ing supporting sleeve removably and rotatively
ciated with said adjusting member for unob
associated with said adjusting member for unob
structed
attachment and detachment therewith
structed attachment and detachment therewith
to serve as a manual handle sleeve end support
and stop for said adjusting member.
to serve as a manual handle sleeve end support
35 and stop for said adjusting member, a polygonal
. 6. In a cutting tool having a central body with
tapered faces and shoes provided with abrasive
members iitting thereon, cupped member on said
body and fitting over the ends of said shoes to
driver member operatively connected to said body
on the end opposite said adjusting member for ro
tation therewith, and a collar coupler fixed to
said body to engage said driver against detach
retain said shoes around said body, a spring posi 40 ment from said body while permitting slight rel
ative universal movement therebetween,
tioned upon and along said body to bear against
10. In a cutting tool having a central body with
one of said cupped members, an adjusting mem
tapered faces and shoes provided with abrasive
ber threadedly engaging said body and adapted to
members ñtting thereon, cupped member on said
bear against the other cupped member, an un
connected calibrated manual hand end bearing 4,5 body and iitting over the ends of said shoes to re
tain said shoes around said body, a spring posi
supporting sleeve removably and rotatively asso
tioned upon and along said body to bear against
ciated with said adjusting member `for unob
one of said cupped members, an adjusting mem
structed attachment and detachment therewith
ber threadedly engaging said body and _adapted
to serve as a manual handle sleeve end support
and stop for said adjusting member, said cali 50 to bear against the other cupped member, an un
connected calibrated manual hand end bearing
brated speed sleeve including a slip collar, and a
supporting sleeve removably and detachably asso
stop screw extending through said slip collar and
ciated with said adjusting member for unob
threadedly engaging said speed sleeve.
structed attachment and detachment therewith
7. In a cutting tool having a central body with
tapered faces and shoes provided with abrasive 55 to serve as a manual handle sleeve end support
and stop for said adjusting member, polygonal
members fitting thereon, cupped member on said
driver member proximate to end of said body op
body and ñtting over the ends of said shoes to re
posite said adjusting member, complemental
tain said shoes around said body, a spring posi
means on saidy driver member and body end to
tioned upon and along said body to bear against
one of said cupped members, an adjusting mem
ber threadedly engaging said body and adapted
to bear against the other cupped member, an un
60 establish a driving connection between said driver
member and body end while permitting their lon
gitudinal separation, and a coupler fixed to said
last named body end to embrace said complemen
tal means for retaining said driver and body end
connected calibrated manual hand end bearing
supporting sleeve removably and rotatively asso
ciated with said adjusting member for unob 65 together against separation while permitting
structed attachment and detachment therewith
slight relative universal movement therebetween.
to serve as a manual handle sleeve end supportr
and stop for said adjusting member, said cali
brated speed sleeve including a slip collana stop
ll. In a cutting tool having a central body with
tapered faces, and abrasive supporting shoes ad
justably fitted upon said faces, said shoes having
70
screw extending through said slip collar and ` a thin abrasive sheet carrying portion sized to
threadedly engaging said speed sleeve, and an
substantially conform with the dimensional limits
enlarged finger grasping knob on said stop screw
of said tapered body surfaces and a substantial
to present a body contacting surface for assisting f ly thicker portion beyond and contiguous to said
in the support of said speed sleeve.
-
8, In a cutting tool having a central body with
abrasive sheet carrying thin portion to compen
2,4115633
sate for the requisite overall body strength of said
abrasive supporting shoes.
12. In a cutting tool having a central body with
tapered faces, and abrasive supporting shoes ad
justably fitted upon said faces, said shoes having
a thin abrasive sheet carrying portion sized t0
substantially conform with the dimensional limits
of said tapered body surfaces and a substantially
thicker portion beyond and contiguous to said
12
abrasive sheet carrying thin portion, there being,
a tapered slot in the bottom surface of and ex
tending for the overall length of said shoes to
serve as a complement of said tapered body sur
faces With the thicker shoe portion serving to
compensate for the requisite overall body strength
of said abrasive supporting shoes in relation to
said tapered slot.
ANTHONY OBERHOLTZ, JR.
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