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Патент USA US2408788

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2,408,787
Patented Oct. 8, 1946 ` 'e
UNITED STATES. PATENT ortica
` INSERTEDy TOOTH MILLING CUTTER ’
Edward O. Lowell, South Pasadena, Calif., as-v
'
signor, byvmfes'ne- assignments, to Lowell and
VGrrayson Manufacturing Company, Monrovia,
Calif., a corporation of California
.
. `
` kApplication Juli 8,1943, seri-a1 îNo. 493,815
,
,
l
y
This invention relates to milling cuttersof the
inserted tooth type and lis particularly concerned
with improvements in the inserted teeth and the
teeth, because, even assuming accurate machin
means for locking and holding the same securely.
lThe principal object of my invention is to pro
vide a milling cutter of the type mentioned, in
or the slots to receive 'the same, were .not ma
which the insertedV teeth I mayv be adjusted, re
moved, or replaced easily, and are arranged to
be locked and held in place, so that they are eX
ing of the body and teeth, there was no guarantee
of the desired rigidity and tightness if the wedges,
chined just as accurately as the rest of the unit.
Hence, the importance in the 'elimination of the
`wedges. Furthermore, in many designs the use
'
of wedges was objectionable because of the‘difii
culty of loosening'the same when adjustment or
10 removal of vteeth was necessary. The serrations
tremely'rigid and there is little likelihood of vi
provided -on the teeth for wedgingly locking the
bration, these features being particularly im
portant where the inserted teethrare tipped with ' same are preferablyof a form providing maxi
tungsten carbide, tungsten titanium carbide, or ' imum thrust of the tooth against theback wall
' of the slot to maintain the precision flat sur
tungsten tantalum carbide, these materials ‘be
«ing hard but not tough,land while possessing 15 faces infirm contact, and yet when the screw, or
screws, employed for holding the tooth are
extraordinary resistance to wear are easilybroken
loosened there is nothing to interfere with the
down> ifV subjected to; excessive vibration. '
o „
i A salient featurev ofv the millingjcutter of ‘my
' vquickfaiid easy> adustment or removalv of _the
invention consists in the provision Yof precision
tooth.
fiat contacting surfaces on the backs of the in 20
serted teeth and the cooperating back walls of
the slots, such contact together withk the secure
ing drawing, inwhich-
wedge locking actionof interfitting serrations on
,
-
The invention is illustrated in the accompany
`
,
~ Figure 1 isa side view of a millingcutter made
in accordance with my invention, showing one
of the inserted teeth in section to better illus.
, trate 'the construction;
front walls of the slots making for the best pos
sible-rigidity and- eliminating danger ,of vibra-'- o, f Fig. y2 ’is an edge view showing two of the in
V'sertedteeth, one in front elevation and the other
tionof the insertedvteethA during operation. In’
the front faces of the inserted teeth land 'the »
manyfearlier designs, interñtting serration's were
'
in end elevation,
and
, -
'
Fig. 3v isr a fragmentary side elevational View
required on theìbacks. of the inserted .teeth and
the back walls of the slots,V` and, of course, it is Y30 cfa-:milling cutter showingla modified or alter
native construction `for the inserted teeth. _
well known that serrations cannotbe produced'
Similar reference numerals are applied to cor
as accurately as fiat surfaces; and', asia result,
responding parts throughout the views.A
the contact between the teeth and the walls of
'
»,
„
‘Referring first to Figs, 1 and 2, the reference
the slots was inclined to be more‘for less irregu
lar, and, as a result, the teeth'lacked' rigidity' 35 - numeral l0 designates the body'of a milling cut
ter- having the usual center hole II and key slot
and were subject to more or less vibration in op
I2. A plurality of. substantially radial slots I3 '
eration.
are provided in the peripheral .portion of the
Another salient feature ofthe ymilling„cutter
., body in Aequally circumferentially' spaced rela
of my invention is the elimination >of the con;
ventional wedgeheretofore employed,> usually at
` least one foreach inserted toothgthe.y inserted.Y
teeth, in accordance with my invention,.relying
upon the interfitting serrations onV the front faces
40
tion tofreceive the inserted teeth i4, in accord-îance with my inventionfWhere a positive or
negative rake angle or helix angle »for the teeth
I4 is desired, instead of .the neutral angle shown,
n the slots I3 may be inclined withrespect to the'
of the teeth andthe front'walls of the`slots lfor
the Wedging action,- thus simplifyingr the machin- ' ,- radii or the axis accordingly, and, of course, this?
same observation applies in regard to the other
ing and reducing the number of parts required, »
so ras to realize an important saving in cost,
while in addition reducing ,theamount of ma
terial required to be cut away from the body,Ak
and' accordingly strengthening the structure as
a> Whole and increasing rigidity and reducing
likelihood of vibration. Obviously, Where wedges
form illustrated in Fig. 3. The periphery of the
-body is cutaway in front of each slot I3, as at
15,101` chip clearance, but the peripheral por
tion I5 of the body behind each vslot is not cut
, away, whereby to providel precision flat> bearing
surface at I'I for good rigid support 4of the in
were required, thereÍwas introduced. an> addi-A
serted teeth I4, these .teeth being provided with , `
tional factor of possible error that might ac
Y precision flat back surfaces I8 for contacty with
count for looseness and lack of rigidityof the 55 the iiat back walls I1 of the slots. AThe front wall y
2,408,787
3
4
of each slot has wedge lock serrations I9 provided
therein to interi-lt in wedge lock serrations 20
provided in the front face of the tooth I4 in
serted in the slot. The teeth lli are adapted to
advantages of my invention. The appended
claims have been drawn with a view to covering
all legitimate modiiications and adaptations.
be inserted in the slots from either side of the
I claim:
1. A milling cutter of the inserted tooth type,
body, the wedge lock serrations having a close
comprising a rotatable body member provided
working nt. Consequently, after the teeth have
become worn and require regrinding, the teeth
with a substantially radial tooth receiving slot,
a tooth in said slot, interfitting serrations on a
wall of the slot and the adjacent face of the tooth,
can be removed and replaced one or more ser
rations removed from the original setting and
.then fastened in the new setting. A pair of
set screws 2l is provided in each tooth threaded
in holes 22 parallel to one another and to the
nat back face i8 of the tooth and the serrated
front face 2B but substantially at right angles to>
said serrations extending generally longitudinally
of the axis of rotation of the body, whereby the
tooth is insertible and removable by movement
laterally with respect to the body, and one or more
fastening screws threaded in through-holes pro
vided in the tooth in transverse relation to said
serrations, said screws being threadable into en
gagement with the inner end of the slot to force
are provided with sockets 23 in their outer ends
the interiitting serrations into wedging engage
for application of a wrench, and are arranged
ment.
`
«
to be tightened against the ilat inner end wall
2. A milling cutter of the inserted tooth type,
24 of the slot. In the tightening of the screws 20
comprising a rotatable body member provided
the slight clearance in the interñtting serra
with a substantially radial tooth receiving slot,
tions i9 and 2li is ‘taken up and the tooth is
a tooth fitting closely in said slot„interñtting
forced bodily against the back wall I1 of the
serrations on the front wall of the slot and the
slot with great pressure, and the tooth is there
front face of the tooth, said serrations extending
fore held ñrmly in place with great rigidity and
generally longitudinally of the axis of rotation
there is no danger of excessive vibration vduring
of the body, whereby the tooth is insertible and
operation. I refer to ‘these serrations as of the
removable by movement laterally with respect to
buttress type because of the resemblance to the
the body, the back wall of the kSlot and the abut
shape of buttress threads, but Want to point out
that whereas a buttress thread exerts force with 30 ting back face of the tooth being flat and in a
plane parallel to the plane of the serrations, and
minimum wedging and friction in relation to
the direction of said serrations, and these screws »
screw pressure, the serrations iQ-Zß are in
tended ~to give the opposite eiîect and provide
maximum wedging` and :friction in relation to the
force exerted by the set screws. Centrifugal
force is also an important factor tending to
tighten the inserted teeth and make for greater
one or more fastening screws which with the in
terñtting serrations comprise the sole fastening
means for the tooth, said screws acting between
the body and tooth by abutment with the one and
The
threaded engagement in the other and disposed
,substantially radially relative to the body -in
transverse relation to said serrations, whereby
not practical to cut the serrations as accurate
ly, and in many previous constructions which
tions, and the ñat back face on the tooth is forced
into tight engagement with the flat back wall of
rigidity and, incidentally, greater safety.
when said screws are tightened the tooth is placed
flat face contact at ll-l3 is particularly irn
under
end thrust radially relative to the body
40
portant from the standpoint of rigidity, because,
member and clamped in its adjusted position by
as previously stated, flat surfaces such as these
Wedging engagement of the interñtting serra
may be produced very accurately, whereas it is
required the provision of interñtting serrations
on the backs of the teeth and the back walls of
the slots, the contact between the teeth and the
slots was suiiiciently irregular to result in vibra
tion during operation. The flat surface contact
the slot.
`
»
3. A milling cutter of the inserted tooth type',
comprising a rotatable body member provided
with a substantially radial tooth receiving slot, a
, tooth in said slot, interñtting serrations on the
taken together with the wedge locking action 50` front Wall of the slot and the front face of the
tooth, said serrations extending generally longi
reduces to a minimum «the likelihood of vibration
tudinally >of the axisk of rotation of the body,
during operation, and that is particularly im
whereby the tooth is insertible .and removable by
portant where the teeth are tipped, as indi
movement laterally with respect to the body, the
cated at 25, with a cemented carbide cutting
back wall of the slot. and the back face of the
edge member, because .these materials are a prod
uct of powder metallurgy and although they pos
sess extraordinary resistance to wear they are
5 5 tooth being fiat and in a plane parallel to the
plane of the serrations, and one or more fastening
screws threaded in through-holes provided in the
easily broken down when subjected to excessive
tooth in transverse relation to said serrations,
vibration or not supported with sufficient rigidity.
said screws being threadableinto .engagement
The wedge lock serrations i9 and 2E) are of 6 0 with the inner end >of the slot to force the inter
fitting serrations into Wedging engagement and
the ibuttress type, but, as shown in Fig. 3, I may
force the nat back face on the tooth into tight en
employ serrations i9' and 2D’ of conventional
gagement with the nat back wall of the slot.
design. The tooth insert I4’ illustrated, it will
4. A mining cutter of the inserted tooth type,l
be understood, is otherwise of the same construc
tion as the tooth inserts i4 of Figs. 1 and 2, hav 65 comprising a body member having substantially
radialtransverse slots, cutter insert members dis
ing set screws 2| threaded therein to engage the
posed in and closely fitting said slots, said cutter
flat bottom surface 24 of the slot i3 and cause
»members
having wedge-shaped serrations trans
the flat back surface lI8 on the tooth to engage
versely in the front face thereof for adjustable
the iiat back wall Il of the slot.` The construc 7 0 slidable engagement in complementary serrations
tion of Fig. 3 will accordingly give substantially
provided generally longitudinally of the aXis of
the same results and advantages as that shown
rotation of the body in the front wallof the slots
'in Figs. 1 and 2.
adapted to be wedgingly engaged upon slight sub- y
It is believed therforegoing description con
stantially radial movement of the cutter mem'
veys a good understanding of the objects and 75 bers relative to the body member, the back wall
2,408,787
5
of the slots and the abutting back face of the cut
ter members being flat and parallel to the plane
of the front Wall of the slots and a tightening
screw means within each cutter mem-ber cooper
ating with the lbody to cause such radial move
ment of the cutter members for wedging engage
ment of the aforesaid serrations and clamp said
6
rations provided generally longitudinally of the
axis of rotation of the body in the front wall of
the slots adapted to be Wedgingly engaged upon
slight substantially radial movement of the cut
ter members relative to the body member, the back
wall of the slots and the abutting back face of
the cutter members being flat and parallel to the
plane of the front wall oí the slots and means
cutter member in place.
for forcing the cutter members substantially ra
5. A milling cutter of the inserted tooth type,
comprising a body member having substantially 10 dially outwardly with respect to said body mem
ber to cause Wedging engagement of the afore
radial transverse slots, cutter insert members dis
said serrations, whereby to secure the cutter
posed in and closely ñtting said slots., said cut
members in substantially immovable position.
ter members having Wedge-shaped serrations
transversely in the front face thereof for adjust
EDWARD O. LOWELL.
able slidable engagement in complementary ser 15
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