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Патент USA US2405609

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Aug. 13, 1946.
w. F. ROSS
Filed Aug. 17, 1944
2 Sheets-Sheet l
- "(Wm/VJ GEM.
Aug. 13, 1946.
w. F. ROSS
Filed Aug. 17, 1944
m. E“r.swanmc1u52x?flh_ mail:
b %m.R.
. 9!?11 m
2 Sheets-Sheet 2
Patented 'Aug. 13, 19,467 _ i 7
2,405,699 _
- “UNITED *islTATEs PATENT (OF-neg ,
"Walter F. Ross, Detroit, Mich; assignor to Motor 1
Tool Manufacturing Company, Detroit, Mich,
a “corporation of Michigan
Application August 17, 1944,'Serial No. 549,891v
2 Claims.
(Cl. 51-100) \
.This invention relates to mechanism for the
grinding of chip breaker interruptions inthe cut
ting teeth of rotary form tools, and similar tools
having pro?led outlines of varying diameter
throughout the length thereof, and has for its
ample, having reference to the accompanying
drawings, wherein:
said invention;
Figure 2 is a longitudinal vertical section taken
' on plane indicated by the line 2—2 in Figure 1;
, object to provide an arrangement which is read
ily adaptable to produce this operation quickly
, Figure 1 is a plan of a ?xture'embodying the
- and accurately on different shapes and sizes of
Figure 3 is an end elevation ofthe device.
tools without calling for tedious and critical set
Similar, characters of reference indicate similar
tingup of the work.
10 parts in the several ?gures of the drawings.
A still further object is to provide such a mech
l0 indicates the base structure of a grinding
anism of simple and easily constructed form
machine on which the longitudinal movable table
which maybe readily attached as a ?xture to an
H is mounted, ‘which table II in turn carries the
existing grinding machine.
transversely slidable table 12. The base structure
A still further object is, to provide in such mech 15 H1 is provided with upwardly extending arms l3
anism for the simple coupling of the work to a
and 14 supporting a rider bar l5 which extends
follower ?nger, co-acting with a vdummy or pro
across and above the transversely sliding table l2.
?led stop de?ning the envelope of the work, in
It represents a grinding wheel which is supported
such manner that the rotation of‘ the work will
and driven in any well known manner (not
be accompanied by the traverse of the follower 20 shown) and with respect to which the said table
?nger over a line de?ning the contour of the
I 2 is longitudinally movable together with the
dummy and such traverse translated into move
table II and transversely movable upon the said
ment of the work relative to the grinding wheel
table H.
along such de?ned path.
‘v 41 and I8 are tailstocks mounted on the said
Still further, objects or advantages additional 25 table I2, 19 and 20 being centers mounted 'inthe
or subsidiary to the aforesaid objects,‘ or result
said tailstocks to receive the work 2| therebe
ing from the construction or operation of the in
tween, and 22 and 23 are similar centers carried
vention as it may be carried into e?ect, will be—
by the said tailstocks in parallel relation tothe
come apparent as the said invention is herein- ‘
said centers [9 and 20 to receive a dummy 24
30I having a, pro?le which is that of the‘envelope of
after further disclosed. ‘
In carrying. the said invention into e?ect, I
may provide a transversely slidable table mount
. ed on a longitudinal movable table which in turn
the cutting surface of the work 2| to be operated
on by the grinding wheel, said dummy 24 acting
as a pro?led stop forv the transversely slidable
is mounted on a ?xed supporting structure, said
table l2 as will be further explained.
transversely slidable -‘ table carrying a ?xture, 35
The rider bar I5 is provided with a normally
which includes a pair of work carrying centers
?xed but'adjustable bracket 25 carrying a follower ,
and a pair of dummy carrying centers arranged
?nger ' 26 which ?nger is intended to impinge
in parallel relation to said work carrying'centers;
against the pro?led surface of the dummy or stop
a follower ?nger having longitudinal line contact
24 under the in?uence of a weighted lever 21
‘with said dummy and carried by a rider bar sup 40 linked to the back of the said transversely slidable
’ported by said ?xed structure, means biasing said
table l2 and thus biasing the said table l2 in the
transversely slidable table to maintain said dum
direction, of the grinding wheel. This lever 21
my in contact with said follower ?nger during lon
will also operate as a handle, by the manual rais
gitudinal movements of said correspondingly
ing ofwhich the said table l2 may be moved away
movable table; a hand operated lead screw linked
from the grinding wheel. It will be obvious that
to said ?xed follower ?nger, whereby the longi
such movements of the table accompany corre
tudinal movement of the dummy may be effected,
sponding lateral movement of the dummy or stop I
and means. transmitting rotary motion of said
24 relative to the ?xed follower ?nger 26, and it
feed screw to the work, whereby the said work
will also be obvious that, if the said table l2 on
may be rotated in contact with a grinding wheel
its table ll be moved longitudinally so that the
as the said work is simultaneously moved longi
pro?led dummy or stop 24 is traversed relatively
tudinally through a path de?ned by the line con
by the follower ?nger 26, the said table will be
tact of the said follower ?nger with the pro?led
caused to recede from the grinding wheel as the
dummy. All of which is more particularly de
diameter of the stop 24 increases. This, longi
scribed and ascertained hereinafter, by way of ex 55 tudinal movement of the said table I2 and its
acoaeoa Y
" Q dummy or its ‘sto'p‘rlll relativeto the said'follower , ‘ dummy. any surface or which presented to the
' ?nger “will be accompanied by the lateral slid- - :rollower ?nger will-provide a lineof contact of
ing of the said table )2 in accordance with varia- '
. itions’, in diameter ofuthje said stop 21! and these
therequired pro?le so that the setting up or the 7
work for the chip breaker grinding is of the very,
simplest nature, the work and its corresponding
which is thatof the contour of the line on the, ' cylindricalfdummy being simply slipped into po
said stop ~24 ‘traversed by‘the followerj?nger'; 26. _, 'sition between‘ their respectivecenters and the
‘follower finger and the wheel adjusted into re
This path of travel is or" course transmitted to
V the work- 2! asthe saidiwork is mountedonthe: ,10 quired contact ‘with the surface of the dummy or
stop and the tooth of the work.
same table.
This invention may be developed within the
‘To’ eflect the foregoing controlled movementoi
scope of the following claims without departing
the work relative to the grinding wheel, and also _
from the essential features of the said invention,
the, synchronized rotation of the work in order
and it is desired that the speci?cation and draw
that the said grinding wheel may pass over a '
ings be read asbeing merely illustrative of a prac
_ helical path about the envelope of the work'a'nd
tical embodiment of the said invention and not
thereby notch the teeth thereof at spaced inter
. I movements will produce a resultant‘path of travel
vals as indicated at 21, I provide a hand operated
feed screw, 28 which is shown as being mounted
in bearings 29 and 30 carried by the tailstocks I1
and I8 respectively. This feed screw is provided
‘with a ,hand wheel 31 ‘for its manual operation
and is threaded through a lead screw follower 32
in a strictly limiting sense.
‘ What I claim is:
1. In a device of the class described, in com
bination, a ?xture table having longitudinally
and transversely guided'support a pair of work- ,
I holding centers mounted on said table, a second
" pair of centers also-mounted on said table in ,
which in turn is connected by the'swingable link
parallel with said work-holding centers,“a» pro
33 and link pivot clamp 34 to the ?xed rider
?led ‘stop carried by said second pair'of centers,
vIBy ‘reason of the linkage‘ referred to rotation '} a ?xed follower ?nger, means biasing said table
ofithe feed screw 28 in one or other direction will
to urge said stop against said ?nger, a feed screw
naturally result in‘thev longitudinal movement of
the table l2 with its supporting table II, and this
- carried by vsaid table, a feed nut on ‘said screw
linked to said follower ?nger for moving said
movement will in turn result in the sliding table 30 table longitudinally and to cause said stop to also
move saidatable transversely by virtue of the
[2 moving transversely of the table H by virtue
riding of said stop over said ?nger, means trans
, of the action of a pro?led stop ‘24 on the follower
?nger 26 as previously described;
VTo effect rotation of vthe Work while this move;
mitting rotary motion'of' said feed screw to the
work during such combined movements, and a
ment of the table is'being effected I provide in 35 grinding wheel positioned to cutting interruptions
in the teeth of said work during the resulting
terchangeable gears 35 and 36 removably mounted
on the shaft of the feed screw 28 and the shank
lineal and rotary movements thereof.
of the work 2 I, and so proportioned that the speed
2. ‘In a device ‘of the class described, in combi
nation,v a ?xture table having longitudinally and
7 of rotation of the work in relation to the longi
tudinal movement in’ front of the grinding wheel 4otransversely guided support a pair‘of work-hold
mg centers mounted on said table, a second pair
will producev the desired helical path of the grind
of centers also mounted on said table in parallel
with said work-holding centers, a pro?led stop
carried by said second pair of centers, a ?xed fol
produce the spacedchip breaker notches in the
teeth of the'work as clearly indicated in Fig 45 lower ?nger, means biasing said table to urge said
stop against said ?nger, afeed screw carried by
ure 1 of the drawings.
ing wheel on the envelope surface of the Work
and thereby enable the said grinding wheel to
The provision of chip breaker interruptions in
the teeth of ‘rotary form and similar tools is, of
course, not new in-itself, it having been a quite
' ccmmon'practice to do this, and the present in
vention lies in the simple expedients adopted by
which ‘the grinding of such interruptions may be
simply and e?ectively accomplished on a form
tool of varying pro?le such, for example, as that
' illustrated in the drawings; and a further im
portant feature of the invention resides in the
use, in the‘ manner described, of a cylindrical
- said table, a feed nut on said screw linked to'said
follower ?nger for moving said table longitudinal
1yv and to cause said stop to also move said table
50 transversely by virtue of the riding of said stop
over said ?nger, interchangeable gears transmit
ting rotary motion of said feed screw to the work
during such combined movements, and a grinding
wheel positioned to cutting interruptions in the
55 teeth of said work during the resulting lineal and
rotary movements thereof.
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