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Get. 8, 1946.
Fi1ed.Dec. 30, 1944
2 Sheets-Sheet l
lamp Will/‘W713
‘ _
W- 3, 1946.
.1. SIMPSON, JR,’ E1- AL
Filed Dec. 30, 1944
2 Sheets-Sheet 2
John S I'm/4:01? Jr;
J7 M‘l/z'ams
22 I @ORNEY.
Patented Oct. .8, 1946
John Simpson, J12. and James Williams, North
Tiverton, R. I. ; said Williams assignor .tosaid
Simpson, Jr.
Application December 30, 1944, Serial No. 570,570
3 Claims.
Our invention relates to cutting tools especially
for truing and undercutting commutators of elec
tric motors and generators.
A portable tool of this character is shown and
described in the Mans?eld Patent 2,145,091.
The main object of .our .present invention is
‘ a-collet or contractible
chuck l3 whose jaws are
clamped on the shaft by ‘a sleeve or spindle l4
and a draw-‘in screw l5. A pin [6 extends from
the sleeve into a slot'l6' in the shank of the collet
to prevent ‘relative rotation when the draw-in.
. screw ‘H5 is tightened.
to perfect such a tool for general commercial
The body H or the tool ?ts snugly on the Sleeve,
carries a cutter {8 in .a manner to be described
chuck adapted to be ‘mounted on the end of the
and is rotatable by means of a handle 19. The
armature whose commutator is to be trimmed 10 sleeve ill-has ascrew thread ,20 on the end oppo
and the cutter is carriedby "a .body which .is
site the collet and these threads ‘are adapted
advanced and-retracted by rotation about the axis
to be engaged by corresponding screw threads
of the armature which is held stationary in a
in a splitnut 2|, 22,. The two halves of this nut
vise. For this purpose the collet is longitudinally
arehinged on .a screw ‘stud 23;,which is seated
adjustable in a sleeve which has an external 15 in‘the flange 1240f the body. A spring '25 presses
screw thread and the cutter carrier body is rotat
thesehut'segments toward the sleeve and a cam
ably mounted on this sleeve and has a split nut
261s mounted on a screw stud 21 between the
adapted to engage the screw threads to feed
free ends of the nut segments. A lever arm
the cutter carrier along the sleeve as the body
28 extending from the cam provides means for
is rotated. As such toolsmust be used with 20 rotating the cam and retracting the nut seg
various sizes of armature shafts and various sizes
ments togpermit free ,movement .-of the cutter
of commutators it is necessaryvto provide many
carrier body. _;A cup-like shield :29 is mounted
adjustments. Unless these adjustments are
on-the ?ange .Ziand encloses ‘the split nut and
properly made and the tool carefully used the
cam and is held in place by the screws 23 and
commutator segments or the wiring is likely to 25 21. A lug 30 projects from the outer face of this
be damaged. Accordingly we have sought to pro
shield and serves as a stop to limit the. outer
vide means for ensuring proper adjustments and
throw of the lever 28 when retracting the nut
Such a tool is provided with a collet .or
automatically controlling the feed of the cutter
by disconnecting the nut and preventing further
When tightening the draw-in screw I5, it is
feed when the cutter has reached the end of 30 necessary to hold the sleeve l4 stationary. For
the proper cutting area.
this purpose, we provide a locking plunger or
We have also sought to protect the split nut
pin 31 which is mounted to slide in a recess [1’
and its cam. Speci?cally we provide an inter
in the body I1 and may be projected into an
locking pin to facilitate the adjustment of the
opening I4’ in the sleeve l4 so as to prevent the
collet on the armature shaft and we hold it in 35 sleeve from turning when the screw 15 is tight
place by the same shield which houses the split
ened or loosened. A spring 32 serves to retract
nut and cam. We also provide means for hold
the plunger pin when pressure is released. The
ing the sleeve to permit adjustment of the collet.
plunger pin has a slot 33 into which the edge of
In the drawings,
the shield 29 projects so as to limit the movement
Fig. l is a side elevation and partial section 40 of the plunger pin and hold it in place.
of a cutting tool embodying our invention.
This locking arrangement permits the operator
Fig. 2 is an end view thereof looking from
to hold the handle I9 and plunge the pin 3| with
the right of Fig. 1.
one hand, and by means of a tool inserted into
Fig. 3 is a sectional view through the inner
an opening l5’ in the end of the screw to turn
sleeve member showing the parts unlocked.
said screw with the other hand, su?icient lev
Fig. 4 is a similar view showing the parts locked.
erage being afforded therefor.
Fig. 5 is a sectional View taken on the plane
The cutter I8‘ is carried by a bar 49 which is
of the line 5-5 of Fig. 1.
slidable in a groove 4| in the carrier body H.
Fig. 6 is an enlarged sectional view showing
The cutter is reversible preferably so that one
50 end may be used for truing the commutator and
the collet, spindle sleeve and associated parts.
Fig. 7 is an exploded partial sectional view
the other end for undercutting between the seg
showing the split nut and associated parts.
ments. A screw 42 serves to hold the cutter tight.
An armature l0 having a shaft end H and a
Adjustment is effected by a screw 43 and spring
commutator I2 is held stationary in a vise (not
44 coacting with a, cross-piece 45 which is clamped
shown) and the tool is supported on the shaft by 55 to the cutter by screw 46. The screw 43 rotates
with the index mark or "0” on the cross-piece
indicates the degree of rotation and hence may
For undercutting the cutter is reversed and a
tool is connected to the stud 50 on the cutter
bar for moving it back and forth.
It will be understood of course that the tool
will receive different sized collets so as to be
able to engage the different sizes of armature
be used to keep the operator informed of the
amount the cutter has been fed toward the work.
The bar 40 may carry a pin 40" to limit its
The undercutting operation is effected by theuse of a lever and link (not shown) connect
ing the body of the carrier to a stud 50 on the
ward the commutator and the cutter bar is set
and locked. The cutter is adjusted and the split
nut moved to engaging position.
freely in the slotted end of the cross piece and
has a graduated scale 41 around its ?ange which
shafts likely to be met in use.
, We claim:
v"1. A commutator trimmer including a collet
slide bar 40.
and a draw-in screw, a sleeve embracing said
The truing or trimming of the'commutator seg-‘
collet and screw and having a recess, a cutter
ments is eiiected by rotating the carrier body and
the cutter around the sleeve M which movement 15 carrier rotatable on said sleeve, an interlocking
plunger pin mounted in the carrier and adapted
feeds the cutter from the outer end toward the
to be inserted into said recess in said sleeve for
inner end of the commutator.
interlocking the carrier to the sleeve, said pin
In order to avoid over-cutting, that is, running
the cutter beyond the inner ends of the com
having a notch in one side and a member carried
carrier body is rotated, the split- nut parts will
rier rotatable on said sleeve, an interlocking
mutator. segments, we provideea cam shoulder 20 by said cutter carrier. and projecting into said
notch to limit the movement of said pin.
54 on the sleeve [4. Whenthe cutter is prop
2. A commutator trimmer including a collet
erly‘ set or adjusted, this shoulder will serve
a draw-in screw, a sleeve embracing said col
as a stationary abutment for the inner edges
let and screw and having a, recess, a cutter car
55'0f the» split nut parts-2|, .22 so ‘that as the
spring retracted plunger pin mounted in the car
rier, and adapted to be inserted into said recess
thus retract the split nut parts and stop the feed
in said ‘sleeve for. interlocking the carrier to the
ing- action.
The body n is-split on one‘ side for adjustment is sleeve, a split nut carried by said cutter car
rier and coacting with said sleeve and a shield
by a screw 56 to a nicerunning ?t on the sleeve
enclosing said nut and holding said pin in place.
3: A commutator trimmer including a collet
~» In truing the commutator, the armature is
ultimately engage this cam shoulder which will
gripped in the vise. - A collet of the desired size
for gripping a commutator shaft, a sleeve em
pin-l6 is properly positioned to prevent the col
nut mounted to rotate and move longitudinally
on said sleeve, a shield surrounding said nut and
secured to said carrier, a cam mounted within
said shield for retracting said nut and a plunger
is inserted into the sleeve, making sure that the ; ' bracing said collet, a cutter carrier having a split
let from turning. » The carrierlbody islslid over
the ‘sleeve and is held in-one hand with a ?nger
on the plunger. The split nut is released and the
sleeve pulled back and revolved. until the plunger ' pin for interlocking-said sleeve and carrier when
drops into its hole. A tool isinserted in the 40 the nut is retracted,‘ said shield limiting the
movement of saidpin.
hole in the screw l5 andthe screwtightened to
cause the collet to tightly’ embrace the arma
ture shaft. The carrier :body is then moved to
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