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Патент USA US2135884

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Nov. 8, i938.
J. Dxsco
2,135,884 -
Filed Dec. 10,.v 1934
¿faQ-¿vá .ß/¿sco
Patented Nov. 8, 1938
' Joseph Disco, Santa Ana, Calif.
Application December 10, 1934, Serial No. '756,869
.5 claims. (o1. 5'1_1s4.3)
This invention relates to an improvement in wedging eifect produced by the sliding thereover
- of the slip. The wide end of the flange 8 of each
an expansible abrading reamer.
It is an object of the invention to improve upon slip terminates at a distance from the end ofthe
slip, but the opposite end of said flange preferably
a device of the character stated, in a number of
extends to the extremity of the slip.
The enlarged portion 5 of the arbor is shown
rior means for detachably supporting a sheet of
as being of a uniform diameter from end to end
abrading material in a secure manner upon the
device; to provide improved means for expanding between the grooves thereof, the taper or slope
a sleeve-like sheet of abrading material; to pro
vide, in combination with other cooperating
parts, an improved expansible split sleeve for
having mounted upon it a sheet of abrading ma
terial; and to otherwise improve certain portions
of the structure as will hereinafter more fully
Referring to the accompanying drawing, which
illustrates what is at present deemed to be a
preferred embodiment of the invention,
Fig. 1 is an elevational view of the device, with
20 a part of the exterior structure broken away to
line I-I of Fig. 6 to disclose the underlying
Fig. 2 is a side elevation of the arbor.
Fig. 3 is a side elevation of one of the tapered
N) Ul slips which form a part of the expanding means.
Fig. 4 is a top plan view of the slip shown in
Fig. 3.
Fig. 5 is a top plan view of the structure shown
in Fig, 1.
Fig. 6 is an enlarged cross section, the plane of
section being indicated by the line G-Iì on Fig. 1.
Fig. ’7 is a fragmental enlarged sectional view
of Fig. l, showing the upper ends of the slips and
the split sleeve in the expanded position.
Referring in detail to the drawing, the arbor 2
has at one end a shank 3 provided with a polyg
onal terminal portion 4 to adapt it to be securely
held by any suitable means of rotation, or
whereby it may be securely held against rotation
while the work is rotated about said arbor.
Said arbor has a diametrically enlarged portion
5 into the periphery of which are formed portions
of a plurality of circumferentially spaced hori
Zontal grooves or guides 6 to receive the tapered
expanding slips or Wedges 1. Said grooves have
inclined bottoms, and said slips are T shaped as
viewed in cross section, having each an inner
flange 8 to ñt within one of the grooves, and at
the outer sides oppositely directed flanges 9 form
ing a head. Said inner flanges 8 are each tapered
from end to end in such a way as to decrease
gradually in breadth and thus form an inclined
plane in order to secure the gradual wedging
effect desired. The groove for each slip has its
55 bottom inclined in such a way as to double the
being confined to the bottoms of the grooves E5.
All the arbor parts shown in Fig. 2 may be made
in one integral piece.
In a longitudinally spaced relation to the en
largement 5 is shown another shorter diametrical
enlargement, or head, II and between said en
largements 5 and Il intervenes an arbor section
l2 having a uniform diameter which is interme
diate the diameters of the shank of the arbor
and its enlargements II and_5. The grooves 5
extend the entire length of the three enlarged
portions of the arbor, and their bottoms decrease 20%
somewhat in depth at one end within 1¿he head
II, as indicated at I3. This groove portion I3 is
preferably shaped to match up with a cut away
part I4 of each slip flange or rib 8.
Not far from its polygonal extremity 4 there is
secured to the arbor a stop sleeve I5 having at its
outer extremity a thick internal annular flange
I6 which receives the pin Il whereby said stop
sleeve is secured to the arbor. The space be
tween said internal annular flange and the oppo
site end of the sleeve is occupied by a spiral com
pression spring I8, said spring projecting a con
siderable distance beyond the inner end of the
sleeve. Around the projecting portion of said
spring and also over the adjacent part of the
sleeve I5 is slidably fitted a follower sleeve IS one
end of which is shown beveled at 2I and the other
end of which is provided with an internal annular
ñange 22 that slidably engages the shank of the
mandrel, said flange forming an abutment for
one end of the spring I8, the opposite end of said
spring engaging the outer end Wall I6 of the stop
sleeve I5.
This arrangement causes the inner end of the
slidable sleeve I9 to abut yieldingly against the
adjacent ends of all the slips 1, said sleeve slip
ping back when the slips are forced toward that
end of the arbor. Such a movement of the slip is
effected by means of an adjusting sleeve or nut 50
23 which screws on to the reduced threaded por
tion 24 of the arbor the diameter of which
threaded portion being such that the bottoms of
said grooves 6 lie outside the periphery of said
threaded portion so that said grooves do not 55
vextend into said threaded portion and cut the
threads thereof.
'I'he slips 1 are restrained from radially out
ward displacement, in part, by the split sleeve 25,
preferably of “Bakelite”, which is closely fitted
over them.
The slips form a mounting means
for said sleeve, and by sliding the slips as above
indicated said split sleeve is diametrically ex
panded to the desired extent.
Over said sleeve is fitted a sheet 26 of mate
rial having an external coating of abrasive mate
rial. Said sheet has opposite infolded edge por
tion which enters the split in said sleeve to pre
vent relative rotation between said sleeve and
said mounting means.
2. In a device of the kind described, an elon
gated arbor having for a portion of its length an
enlargement of substantially uniform diameter,
longitudinal grooves decreasing in depth towards
one end of the arbor cut into said enlargement,
expanding slips slidably mounted in said grooves,
an expansible abrading sleeve mountable upon 10
said slips in a circumscribing relation thereto,
said arbor being formed at one end of said en
tions 28 which overlie the edges of the sleeve 25 - largement with a threaded end portion, a nut
along its split portion. Elongated clips 29 each fitted on said threaded end portion for engaging
15 having, as viewed in cross section, reversely bent vthe adjacent end of said abrading sleeve and the
limbs 3| and 32 are provided to hold the abrad
adjacent ends of said slips for moving said sleeve
ing sheet 26 in place upon the split sleeve v25, and said slips longitudinally of said arbor and
one portion of each of said clips gripping .an edge 'said slips along said grooves for expanding said
portion of said sleeve and another portion thereof abrading sleeve, a follower sleeve slidably fitted
20 gripping an edge of said sheet.
on said arbor beyond the other end of said en 20
The four slips shown (a greater or a less num
largement and engaging at its inner end the
ber may be used'if desired) are notheld together adjacent end of said abrading sleeve, the inner
by the sleeve 25 alone, but each slip flange 8 is end of said follower sleeve being closed around
apertured at 35 near its broad end; a resilient said arbor, a stop sleeve secured on said arbor
; split circular ring 36 extends through the aper
with its inner end telescopically extending into
tures 35 to retain the slips in their operative the outer open end of said follower sleeve, said 25
position and yet permit them to slide lengthwise stop sleeve being closed at its outer end and open
ofthe arbor. This springv ring 36 is sufliciently at its inner end, and a coil spring surrounding
large to encircle the arbor portion I2.
said arbor within said follower sleeve and said
One of the slips (see Fig. 6,) is furnished with stop sleeve, and bearing at its ends against the 30
an outward projection 3'! which enters the split closed inner end of saidfollower sleeve and the
of the split sleeve 25 to. keep said sleeve from closed outer end of said stop sleeve.
rotating independently of the arbor. The side
3. An abrading tool including a mandrel having
portions of this slip press against the limbs 32 a plurality of circumferentially spaced longitudi
, of the clips 29 and thus aid them in their sheet
nal grooves, the grooves having walls inclined 35
gripping functions.
The follower sleeve I9 has its inner end cupped
at 40 and this cupped part registers with the
bevels 4I on the adjacent sleeve end, while at
2 the opposite ends of the slipsthe adjusting sleeve
23 is likewise cupped at 42 to engage the sleeve
bevels 43.
By adjusting the internally screw threaded
sleeve or nut 23 to the desired position with
relation to the length of the arbor and thus
sliding the tapered slips in their grooves against
the opposition of the spring I8, the sleeve 25
and abrading sheet 26 maybe varied in diameter
to apply the proper amount of >abrasive action
to the surface of any bore to be polished or
reamed out to a larger size.
The split sleeve 25 and abrading sheet 26 com
bined with the retaining clips 29 are deemed to
constitute a new article of manufacture appli
65 cable to other rotatable reaming devices than
the reamer which has been described.
I claim:
1. In a device of the kind described, an arbor
having circumferentially arranged longitudinally
extending guiding means, slips or wedges mount
ed upon said guides, said slips being longitudinally
movable and constructed and arranged to form
a mounting means which is varied in its exter
nal diameter by their longitudinal movement,
and an abrading member consisting'of a split
sleeve mounted upon said mounting means, at
least one of said slips having an outward projec
longitudinally of the mandrel, slips movable
longitudinally in the grooves and cooperating
with said walls, said slips being of T-shape in
cross-section with one flange >thereof disposed in
one of the said grooves, a split tubular member 40
supportedby the slips and having a cylindrical
periphery, an abrasive element on the periphery
of the member, and means for shifting the slips
in the grooves to expand the member.
4. In a device as disclosed, an elongated arbor
having external longitudinal grooves decreasing 45
in depth towards one end of said arbor, tapered
expanding slips slidably mounted in said grooves,
said slips being T-sh-aped in cross section with
their T-heads at their outer edges forming bear
ing surfaces, means for sliding said slips in said
grooves -for moving said slips outwardly of said
arbor, and an expansive abrading sleeve sur
rounding said slips and engaging the outer bear
ing surfaces of the T-heads of said slips.
5’. An abrading tool including a mandrel hav
ing a plurality ofcircumferentially spaced longi
tudinal grooves, the grooves having walls in
clined longitudinally of the mandrel, slips hav
ing ñanges movable longitudinally in the grooves 60
and cooperating with said walls, said slips hav
ing heads wider than the flanges, a split tubular
member supported by said heads land having a
cylindrical periphery, an abrasive element on the
periphery of said member, and means for shift
ing the slipsin the grooves to expand the member.
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