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Патент USA US3083610

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April 2, 1963
w. H. RHINDRESS
3,083,600
COMMUTATOR SMOOTHING DEVICE
Filed July 20, 1961
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E
2 Sheets-Sheet 1
56
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‘ INVENTOR.
WALTER
H. RHINDRESS
ATTORNEYS
April 2, 1963
w. H. RHINDRESS
3,083,600‘
COMMUTATOR smoo'mmc DEVICE
Filed July 20, 1961
2 Sheets-Sheet 2
/
INVENTOR.
WALTER H . RHINDRESS
BY
Jdh / 77M
ATTORNEYS
United States Patent 0 ”
3,083,660
Patented Apr. 2, 1963
2
against rotation, whereby a collet mounted therein and
3,0335%
adapted to releasably receive an armature shaft may be
drawn into the hollow shaft by a handle control which is
threaded to the collet end, until the armature shaft is
securely locked in the collet and the collet and the handle
COMMUTATQR Sit/i691 % -_G DEVEQE
Walter H. Rhindress, 94 West St, llraintree, Mass.
Filed July 29, 1961, Ser. No. 125,497
5 Claims. (ill. 82-4)
tightly frictionally engage the hollow shaft for simul
The present invention relates to devices for smoothing
taneous rotation of the hollow shaft, the collet and the
commutators, and has speci?c reference to a hand oper
armature shaft. .
ated portable smoothing device of novel design.
To this end, a collet of standard type having a split
The present invention is a continuation-in-part of co
10 conical head portion and a threaded rear end is employed,
pending application Serial No. 508,969, ?led ‘May 17,
and the collet is mounted in a hollow shaft having a coni
1955, md entitled commutator Smoothing Device, now
cal beveled mouth, whereby a draw'in threaded ?tting
abandoned.
seated in the other end of the hollow shaft is adapted to
The principal object of the invention is to provide an
be turned by a handle to pull the collet inwardly for
improved commutator smoothing device which has a feed 15 gripping an armature shaft. The hollow shaft is locked
spindle and a collet for releasably gripping the armature
against rotation during this grip-ping pull, and the feed
shaft, and which may be removably mounted on a sup
guide is located in released position. When the armature
shaft is tightly locked in place, the hollow shaft is tightly
gripped between the collet head and the draw-in ?tting,
and entire unit is then shifted to unlocked position. The
feed guide is then snap set into feeding engagement with
the threaded portion of the hollow shaft, and the handle
port base or secured within a vise, as desired.
Another object of the invention is to provide a com
mutator smoothing device with a novel collet control for
ensuring a ?rm lock on the armature shaft.
Still another object is to provide a commutator smooth
ing device in which the means for mounting the armature
is rotated to simultaneously rotate and feed the hollow
shaft is rotated and simultaneously fed longitudinally
shaft, the collet and the armature forwardly, wherein the
with respect to a ?xed smoothing tool,
25 armature commutator is engaged by a smoothing tool that
A further object is to provide a commutator smooth
is mounted in the stationary frame.
‘
Referring to the drawings, the commutator smoothing
ing device with a concealed thread feed which is not ex
posed to dust and dirt no matter what the position of
device embodied herein is generally indicated at 10 and
includes a hollow frame 11 that is formed with a cylin
drical bore 12 (H6. 4) and has a depending extension
13 of narrow width joined thereto that is adapted to be
readily locked in a vise or detachably received within an
upper slot recess 14 of a base 15. The base 15 is
adapted to be bolted to the top of a table or the like and
is provided with a lock screw 16, as shown in FIG. 2,
for locking the extension 13 within the slot recess 14.
the feed, and which further has an improved bearing ar
rmgement so as to eliminate chatter during the feed of
the armature shaft.
An additional object of the invention is to provide a
snap lock control for locking and for releasing the spindle
feed.
With the above and other objects and advantageous fea
tures which will become apparent as the description pro
ceeds, the invention consists of a novel arrangement of
parts more fully disclosed in the detailed description
‘Rotatably and slidably mounted in the bore 12 of the
frame 11 is a hollow shaft 17 which as shown in FIGS, 4
and 5 has a central threaded portion that is adapted to
thereof, in conjunction with the accompanying drawings,
and more speci?cally de?ned in the claims appended 40 be engaged by a feed guide gener?ly indicated at 19. As
illustrated more clearly in FIG. 5, the entire length of
thereto.
In the drawings:
the threaded portion 18 is enclosed by both ends of the
FIG. 1 is a side elevation of a preferred construction
frame 11 and remains enclosed even through the hollow
shaft may have been moved to the outer limit position
embodying the invention, parts being broken away;
45 shown in H6. 5 during the connnutator smoothing op
FIG. l—a is a fragmentary top plan view of ‘FIG. 1;
FIG. 2 is an end view of FIG. 1 with parts being
eration. The threaded portion 18 is thus protected from
dust and grime and will always be clean for positive en
shown broken away;
FIG. 3 is a side view of feed nut of HG. 1, parts being
gagement with the feed guide 19.
As shown ‘more clearly in FIG. 4, the hollow shaft
broken away;
FIG. 4 is a partial sectional View taken along lines
17 is ?rmly supported in position by the frame 11, the
opposed inner surfaces of the frame that ?ank the
4——4 in PEG. 1;
’
FIG. 5 is an enlarged sectional view of a portion of
threaded portion 18 de?ning spaced bearing surfaces for
the hollow shaft showing an extreme position thereof in
the hollow shaft. it is seen that these spaced bearing
the hollow frame that encloses the shaft threaded por
surfaces support substantially the major length of the
tion;
55
hollow shaft and prevent chattering vof the shaft during
FIG. 6 is a sectional View taken along line 5-5 in
the commutator smoothing operation. It is of extreme
FIG. 1;
~
importance that there always be bearing engagement at
FIG. 7 is an exploded perspective view of the snap
opposite ends of the threaded portion ‘155, no matter
lock parts;
in what relative position the hollow shaft and frame
FIG. 8 is a perspective View of a collet diameter ad 60 may be, since without this bearing at both ends of the
justment spacer; and
threaded portion, it has been found that severe chatter
, FIG. 9 is a side elevational view of the collet that is
ing takes place when the commutator is being smoothed.
locked in the hollow shaft.
Thus, the structure which insures that the threaded por
it has been found desirable to provide a construction
tion is always enclosed and protected against dirt and
for a portable armature smoothing device, which may be
readily mounted on a work table or in a vise, as desired,
and which includes a stationary frame with a rotatable
grime also simultaneously and inherently provides the
proper bearing for smooth and effective ‘feed of the com
mutator.
hollow shaft, the hollow shaft having feed threads for
Referring to FIG. 7, the feed guide 19 is shown in
meshing with a releasable feed guide that is mounted on
the frame and that is adapted to be snapped into and out 70 cluding a cylindrical portion 20 that is adapted to pro
ject through an opening 21 (PEG. 6) formed in the
of feeding engagement with the shaft threads. The hol
frame ll. The cylindrical portion 26' is formed with
low shaft is further provided with means for looking it
3,088,600
4
an arcuate threaded lower’ surface 22 that is adapted to
engage the threaded portion 18 and is further formed with
an upstanding threaded post 23 that projects outwardly
?rmly mounted in the collet 1-7, the hollow shaft 17 is
slidably moved to the right to move the pin 52 out: of
of the frame 11.
The apparatus is now ready for the commutator turn
ing operation, and for this purpose a bit or tool 53 is
the slot 51.
Cut away at opposite sides of the
cylindrical portion '26 are parallel guide surfaces 24
'
which seat within sides 25 of a U-shaped bracket 26
that is mounted'on the frame 11 and over the opening
21.
provided that is adjustably mounted in tool holder 54.
align the groove 32 and the ridge 28, the spring 30*
urges-the feed guide 19' downwardly so that the thread
mutator to be smoothed is ?rst securely mounted within
the collet 37. This is accomplished iby locking the hollow
The tool holder 54 is mounted for axial adjustment in a
mounting bracket 55 that is formed with a slot for
receiving the holder. Lock bolts 56 extend through’
Formed in the bight portion 27 of ‘the bracket 25
is a V-shaped ridge 28 that is formed with a central 10 threaded openings in the bracket ‘55- and project into a
longitudinally extending groove 57 formed'on the upper
opening 29 through which the outer end of the post 213
surface of the holder 54. Axial adjustment of the holder
extends. Encircling' the post ‘23 and bearing against
54 is effected by loosening 'the bolts 56 and sliding the ,
the bight portion 27 and against the outer end of the
holder within the bracket 55 as desired. In and out ad
cylindrical portion 20 is a compression spring 30' that
is adapted to urge the inner threaded surface 22 of the 15 justment of the tool 53 is also provided by an adjustment
nut 58 that threadably engages a threaded bar 59 and
feed guide 19 into threaded engagement with the thread
that is secured to the tool 53 by an extension 60 and a
ed portion 18 of the hollow shaft 17.’ lIn ‘order to lift
set screw 61. Movement of the nut 58 along the length
the cylindrical portion 20 out of engagement wtih the
of the bar 59 carries the tool 53 therewith, thereby ad
threaded portion 18, a cam element 31 is provided and
is formed witha V-shaped groove 32 that is adapted to 20 justing the cutting end of the tool with respect to the
commutator to be smoothed. A lock nut 62 cooperates
cooperate with the V-shaped ridge 28. An opening 33
with a ?xed nut ‘63 (FIG. 2) to lock the tool '53 from
extends through the cam element 3-1 through which the
movement therehetweenrduring the commutator cutting
post 23 extends and a stop nut 34 is mounted on the
operation.
a
outer end of the post for engagement by the cam ele
ment. When the cam element 31 is snap-turned to 25 . In use, the shaft of the armature that carries the com
shaft 17 from rotation by axially shifting the shaft 17 ‘7
ed lower surface '22. thereof threadably engages the
until the pin 52 on the hollow shaft engages the slot 51
threaded portion 18 of the hollow shaft 17. When the
cam element 31 is rotated at right angles with respect 30 formed in the frame 11. The draw-in ?tting 42 is next
inserted within the shaft 17 into engagement with the
to the bracket 26, the groove 32 is lifted out of mating
threaded end 41 of the collet 37. The handle 49 is then
engagement with the ridge 28, thereby causing the cam
rotated to draw the collet 37 inwardly into tight gripping
element 31 to move outwardly. This outward movement
relation with the hollow shaft which locks the armature
of the cam element carries the nut 34 therewith, and
since the post 23 is secured to the nut 34, it will also 35 shaft’in position. The hollow shaft is next moved axially
to the right to free it from the ‘frame 11. The cam ele
be lifted to retract the threaded surface 22 from en-'
gagement with the threaded portion 18.
ment 31 is now rotated so that the the groove 32 coincides '
.
Referring now to FIGS. 4 and 5, the mouth of the
hollow shaft .17 is shown being conically beveled or ta
peredras indicated at 35, to receive the conically en-'
larged split head as of a collet 37. The rear portion
of the collet indicated at 38 (FIG. 9) has a longitudinal
guide groove 39 formed therein in which a pin 40 seats,
the pin 40 being located in an opening formed in the
wall of the hollow shaft 17 adjacent the rear end there
of. The rear’ end of the collet indicated at 41 is thread
ed and is adapted to receive a draw-in ?tting 42 having
an internally threaded shell 43 formed thereon which
slides in an annular recess 44 in the hollow shaft. The
draw-in ?tting 42 is adapted to draw in the collet 37
against the tapered mouth of the shaft 17 upon rota
tion thereof until an armature shaft seated in the collet
37 or ‘in a collet adapter or'diameter adjusting sleeve
45 is tightly gripped. As shown in ‘FIG. 3, a head 46
of the draw-in ?tting 42 is vformed with a cross slot 47
that is provided with a screw mounting for receiving the
turning bar 48' of a handle 49.
a
with the ridge 28. This drops the cylindrical portion 20
downwardly, and the spring 30 urges the concave threaded
40 surface 22 into threaded engagement with ,the threaded
portion 18. 'After adjustment of the cutter tool; 53, the
.
handle 49 is rotated to rotate the armature commutator
and simultaneously feed it axially with respect to the ?xed .
cutter tool 53. Thus it will he'seen that rotation of the ,
45 same handle i49 is effective to ?rst lock the commutator
within the collet and then to rotate and axially feed the
commutator for smoothing.
Although I have disclosed a speci?c constructional fea
ture of my invention, it is obvious that changes in the size,
50
shape, arrangement and positioning of the parts maybe
made to meet different armature smoothing requirements,
departing from the spirit and the scope of the, invention as
de?ned in the appended claims.
What is claimed is:
55
1. In a device for smoothing the commutator of an
armature, a ?xed frame having a cylindrical bore, a hollow
shaft mounted in said bore for rotatable and axial slidable
movement with respect thereto, an externally threaded
portion formed on said hollow shaft intermediate the ends
In order to lock the'hollow shaft 1'7 from rotation
when the armature shaft is secured in the collet 37, the
rear edge 50 of the frame 111 is’ formed with a slot 60 thereof, the portions of said bore on opposite sides of said
51 for receiving a pin 52 that is mounted on the hollow
threaded portion de?ning bearing surfaces for said hollow
shaft 17 adjacent the right end thereof as seen in FIG. 1,
shaft and the extreme ends of said threaded portion being j
it being understood that the hollow shaft is free to slide
located intermediate the bearing ends of said frame re’
longitudinally with respect to frame 11 when the feed
gardless of the axial movement of said hollow shaft with '
guide 19 is disengaged, whereby pin 52 may be aligned 65 respect to said frame, said hollow shaft having a conically
with slot 51 and slid therein. With the hollow. shaft
beveled mouth, a collet located in said hollow shaft hav
ing an enlarged conical split head and an externally
17 thus locked :from rotation, the draw-in ?tting 42 is
rotated by the handle 49 thereby causing the collet 37
threaded rear portion, means on said collet and shaft
to move toward the draw-in ?tting due to the interen
cooperating to prevent rotation of said collet while per
mitting sliding movement of said collet in said hollow
shaft, a draw-in ?tting poistioned at the rear of said hol
low shaft and including an internally threaded shell, means
'gagement of therthreaded end 41 and the internally
threaded shell 43; ' Movement of thefcollet 17 to the
right as seen in FIG. 1 causes the tapered head 36 to
on said hollow shaft and said frame for locking said hol
grips the armature shaft. When the armature shaft is 75 low shaft against rotation when an armature shaft is to be
‘be forced against the split adaptor 45 which then tightly
3,083,600
6
5
secured in said collet, a handle secured to said draw-in
?tting for producing rotation thereof when said hollow
3. In a device for smoothing the commutator of an
armature, a ?xed frame having a cylindrical bore, a hol
mouth of said hollow shaft and thereby secure the arma
ture shaft within said collet, a vfeed guide located in said
low shaft mounted in said bore for rotatable and slidable
movement with respect thereto, an externally threaded
portion formed on said hollow shaft intermediate the ends
thereof, the portions of said bore on opposite sides of said
frame and radially movable therein, said feed guide in
threaded portion de?ning bearing surfaces for said hollow
shaft is locked against rotation so as to cause the split
head of said collet to frictionally lock in the beveled
shaft, a collet extending within said hollow shaft and
cluding a threaded surface for engaging said threaded
portion, means for urging said threaded surface into en
adapted to be locked in engagement therewith, a ?tting
located at the rear of said hollow shaft and threadably
gagement with said threaded portion and means for with
drawing said threaded surface out of engagement with
engaging the rear end of said collet, means for locking
said threaded portion, said hollow shaft being movable
said hollow shaft to said frame, a handle secured to said
?tting for producing rotation thereof after the hollow shaft
out of ?xed engagement with said frame, wherein said
handle is rotated to rotate the draw-in ?tting, collet, hol
has been locked to said frame, wherein said collet is locked
low shaft secured to said collet and armature shaft secured 15 to said hollow shaft and said armature shaft is locked
in said collet, a feed guide ?xed against axial movement
within said collet, the threaded engagement of the ‘feed
guide threaded surface with said threaded portion caus
and threadably engaging said threaded portion, said hol
ing said hollow shaft and collet to feed axially upon rota
low shaft being movable out of locking engagement with
tion thereof, and a tool mounted on said frame and ?xed
said frame and being rotated by said handle, whereupon
with respect to the rotating armature, said tool engag'ng 20 said hollow shaft is axially moved together with said collet
the rotating commutator of said armature for smoothing
and said armature, and a tool mounted on said frame and
the surface thereof during the axial movement of said hol
?xed with respect to the rotating and axially moving
low shaft.
armature for engaging the commutator of said armature,
2. 1In a device for smoothing the commutator of an
thereby smoothing the surface thereof.
armature, a ?xed frame having a cylindrical bore, a hol 25
4. ‘In a device as set forth in claim 3, said tool being
low shaft mounted in said ‘bore for rotatable and slidable
radially and axially adjustable with respect to the pe
movement with respect thereto, an externally threaded
ripheral surface of said commutator.
portion formed on said hollow shaft intermediate the ends
5. In a device as set forth in claim 3, said feed guide
thereof, the portions of said bore on opposite sides of said
including a U-shaped bracket mounted on said frame
threaded portion de?ning bearing surfaces for said hollow 30 ‘and positioned over an opening formed therein, said
shaft, said threaded portion being located between said
bracket including a V-shaped ridge ‘formed on the bight
bearing surfaces so as not to be externally exposed re
portion thereof, and a hole extending through said V
gardless of the axial movement of said hollow shaft with
shaped ridge, a cylindrical portion having an arcuate bear
respect to said frame, a collet extending within said hol
ing surface extending into said opening in said frame and
low shaft and adapted to be locked in engagement there 35 being adapted to engage said threaded portion, a post
with, means on said collet and shaft cooperating to pre
secured to said cylindrical portion and projecting through
vent rotation of said collet while permitting sliding move
said hole in the bight portion of said U-shaped frame, a
ment of said collet in said hollow shaft, a ?tting located
spring encircling said post and located between said
at the rear of said hollow shaft and threadably engaging
cylindrical portion and the undersur-face of said bight
the rear end of said collet, means for locking said hol 40 portion for urging said arcuate bearing surface of said
low shaft to said frame when a shaft of said armature is
cylindrical portion into engagement with said threaded
to be secured in said collet, a handle secured to said ?tting
portion, a cam element loosely mounted on said post
for producing rotation thereof when said hollow shaft is
and including a V-shaped groove for mating with said
locked on said frame wherein said collet is locked to said
V-shaped ridge and a stop nut secured to said post
hollow shaft and said armature shaft is locked in said 45 and cooperating with said cam element to radially
collet, a feed guide ?xed against rotation and having a
lift said post and cylindrical portion joined thereto where
threaded surface for threadably engaging said threaded
in said threaded surface is withdrawn from engagement
portion whereupon rotation of said hollow shaft produces
with said threaded portion.
a corresponding axial movement thereof, said hollow shaft
being movable out of locking engagement with said frame 50
and being rotated by said handle to produce the axial
movement thereof, wherein said collet and the armature
secured thereto are rotated and axially moved as a unit,
and a tool mounted on said frame and ?xed with respect
to the rotating and axially moving armature for engaging 55
the commutator of said armature and smoothing the sur
face thereof.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,841,550
2,281,307
2,357,765
2,409,158
Parker _______________ __ Ian. 19,
John-son _____________ __ Apr. 28,
Rhindress _____________ __ Sept. 5,
Simpson ______________ __ Oct. 8,
1932
1942
1944
1946
2,746,497
Thompson ___________ __ May 22, 1956
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