Note: Descriptions are shown in the official language in which they were submitted.
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BACKGROUND OF TH~ INVENTION
This invention relates to milling machine arbors and
adaptors therefor and specifically provides for a rigid and
accurate mounting arrangement for cutter bodies, especially -~
milling cutters a~d power driven spindle. An ~asily operable,
quick release mechanism allows ~he cu~ter body to be removed
and replaced with a minim~lm of effort and tooling.
Prior art arrangements for mounting mill-ing cutters may be
found in The Machiner~'s Handbook and other sLmilar sources.
10 These arrangements usually require the removal of several bolts ~ -
and ~he like before removal and replacement of the cutter body
can be achleved.
Pertinent to the patentability of the present invention . ..
~ are applicant firm's own patents and applications ~n tool holders
'~ utilizing rad~ally movable clamp elements to achleve a rigid
interconnec~ion between tool holders and their supports. ~:
B~IEF SUMM~RY OF THE INVENTION
According ~o the present invention, a shank is provided
which interconnects a power driven spindle and a cutter body,
2C and ~he shank, cutter body and power driven spindle all have a
.1 common axis of rotation. Cooperating elements Qf abutment.mea~s
~ and key~ng means are provided between ~he spindle and cut~er
I body.
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One e~d of the shank is pro~ided with a perforation,
preferably a central axi81 per~ora~ion communicating with
radially outwardly extending bores. Carried in the perforation . .
are radially movable clæmp el~ments9 preferably ball-like .. ~
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elements, that upon actuation will project beyond the envelope
of the shank. A bore having a shoulder is formed in either
the power driven spindle or the cutter body and is designed to
mate with ~he one end of the shank carrying the radially
outwardly movable clamp elements.
The shouldex of the bore is preferably shaped so that
when the radially movable clamp elements engage said shoulder
the cooperating elements of abutment means between the cutter
body and the spindle are urged into a ~irm abutting relationship.
The other end of the shank which is not carrying the clamp
elements is fixedly secured to the other of said spindle and
said cuttex nok having a bore thereon. The other end of said
shank may be secured by a drawbar to the power driven spindle
or by ~hreadingly engaging an end cap member which holds the
cutter body to the shank.
Actuator m~ans are movable axially within the
perforation in the shank and preferably comprise a threaded
screw element and a ball-like element that may be moved into and
out of engagement with said radially movable clamp elements.
The shouldered bore is preferably formed with a ring-
like element inserted in the bore with one surace of the
ring-like element providing the shoulder in the bore and one end
of the ring~like element abutting the one of the other of the
cutter or arbor having the bore formed therein.
In accordance with one broad aspect, the invention
relates to an arrangement for mounting a milling cutter and
shank on a power driven spindle wherein the cutter~ shank and
spindle have a common axis of rotation, ~he arrangement
comprising; a milling cutter and a power driven spindle rigidly
connected by a shank and having cooperating elements of
abutment means and cooperating elements of keying means between
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said spindle and said cut~er, a bore having a shoulder formed
in one of said spindle and said cutter, and radially movable
clamp elements mounted in a perforation formed on one end of
said shank, said clamp elements movable radially outwardly so
as to abuttingly engage said shoulder in said bore and urge
said cooperating elements of abutment means into engagement.
In accordance with another aspec~, the invention
relates to a method of mounting a cutter on a power driven
spindle for rotation on a common axis comprising the steps of
interconnecting said spindle and said cutter with a shank fixed
to one end of said spindle and cu~ter, abutting one side of
said cutter to one end of said spindle, keying said cutter to
said spindle, and engagj.ng a shouldered bore in one of said `
spindle and said cutter with radially movable clamp elements
carried by said shank so as to urge said cutter and said spindle
into firm abutment with one another.
The exact nature of the present invention will become
more clearly apparent upon reference to the following detailed
specification ~aken in connection with the accompanying drawings `
in which: .
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Figure 1 is a side view par~ly in sec~ion showing a
milling cutter and spindle according to the present invention
with a connecting arbor extending therebetween.
Figure 2 is a sectional end view of the tool according to
Figure 1.
Figure 3 is a view enlarging the key arrangement shown in
Figure 1.
Figure 4 is a fragmentary view showing a modification.
Figure 5 is a view like Figure 1 showing a diferen~ sort
of arbor arrangement.
Referring to the drawings somewhat more in de~ail, and wi~h
particular reference to Figures 1 to 4, reference numeral 10
represen~s a power driven spindle having a central bore 12
terminating in an outwardly tapering portion 13. Tapering
portion 13 is adapted for receiving a tapered arbor 14 which, at
the end inside spindle 105 iS threadedly engaged by drawbar 16.
The other end of arbor 14 projects axially outwardly from
the end of spindle 10 a~d is received in a central hole in cutter
body 18 of a milling cu~ter. The outer end of arbor 14 has a
cylindrical por~ion 20 ~hereon which is closely receivable
inside central bore 22 in body 18.
Body 18 has an annular recess 24 formed therein which
includes a~ inclined shoulder portion 26 engageable by clamp
elem~n~s 28 ~n the form of balls located i~ respective, subs~an-
tially radial bores 30 fo~med in the outer end of arbor 14.
The arbor includes a ~hreaded axial central perforation 32
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within which is threaded a clamp screw 34 that engages the
axially movable actuator ball 36 mounted in the bore.
It will be evident that rightward movement of actuator
ball 36 will force clamp balls 28 radially outwardly into
engagement with shoulder 26 thereby to olamp cutter body 18
fixedly in place with the surface 38 of the cutter ~ody firmly
pressed against surface 40 on the end of the arbor~
Rotation of the body 18 on the central axis of arbor 14
and spindle 10~ the body may be provided with a keyway 42 while
10 a key 4~ is mounted in a notch 46 provided therefor in the :~
end of spindle lO with the key block being fixed in place by a
screw 48. .
The arrangement provides for a s~mple and extrem01y rapid
manner of mounting cutter bodies on spindle 10 and of removing
cutter bodies therefrom. No clamp bolts or the like are ~ .
required and the illustrated arrangement will remain efective
over a long period o time.
The shoulder 26 which is engaged by the clamp balls 28
may be provided by a hardened material 50 in the form o a ring : .
mounted in body 18 as shown in Figure 4. The hardened material
50 can be fixed to body 18 in any suitable manner in order :~
properly to transfer the clamping loads from clamp balls 28 to
cut~er body 18.
Figure 5 shows a modifica~ion in which a spindle 60 has a
central bore 62 therein with a ring, advan~ageously of hardened
steel~ 64 mounted in the ou~er end of the bore and cl~mped
~ : therein as by clamp screw 66. Ring 64 has an i~clined shoulder
il 68 formed on the inner end and internally is of a size to
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receive and closely embrace a shank 70 which has an axially
outer end 72 fitted in a central bore 74 ln a cutter body 76.
A tubular clamp bolt 78 threads into the outer end of arbor
70 and clamps the cu~ter body against shoulder 80 formed on
arbor 70.
The body 76 may include a keyway 82 into which a key 84
; fixed on spindle 6Q extends to hold cutter body 76 against
; rotation on the spindle.
; Shank 70 h~s a central borP 86 whIch receives an actuator
ball 88 and which cen~ral bore is intersec~ed by radial bores
87 each having a clamp ball 90 therein engageable with shoulder
68 when actuator ball 88 is moved to the right, Movement o~ :
the actuator ball is accomplished by a screw 92 mounted ln a
~ threaded bore 94 in arbor 70 and the outer end of which is -. .
; accessible through the cen~ral bore 96 in clamp screw 78 in
which central bore m~y, to-advantage, be configured to receîve
a drive wrench for rotation of clamp screw 78 which may also
; receive a wrench for turning clamp screw 78.
Modif~cations may be made within ~he scope of the appended
claims.
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