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Патент USA US2404149

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July 16,-, 1946o ‘
'
D. R.'_TR1NK|_E
`
CONTOURING
2,404,149
MACHINE
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original Filed Aug. ,20, 1941`
¢
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2 sheets-sheet 1
F193 IM
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202
555
„j 55055/ Z0]
v
.53’v '5
i
y
u
`INVENTOR
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5MM/Í?
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BY
. ATTORNEY
Patented July 16,1946
2,404,149
UNITED STATESv PATENT OFFICE
2,404,149
ooNToURING
-Dallas Rhea Trinkle, Dayton, Ohio, assignor to
yMemo-Trinkle‘.Machine Co., -San Francisco,
lC_alif.„a corporation of California
Original application August 20, 1941, Serial No.
" 407,670, now Patent No. 2,365,365, dated Decem
ber 19,1944. Divided and this
application Feb-'
ruaryl 1, 1943, Serial No. 474,265
1
.
This invention relates to the art of metal Work
in_g and more particularly to meansforeffecting
contouring or die sinking, orother operations to
provide a given outline> or shape, the presentap
, plicationbeinga division Aof myco’-pending.appli_
cation, Serial No. 40_7,670,`filed August 20,51941,
„now
Patent No. 2.365.365, Agranted December 19,
_
19,44, which in turn was 4a continuationin part
._ofzmyprior application, Serial No. 291,872,.ñ1ed
2
Fig?
isahorizontal
section on the lineJ-l
of Fig.,_6;
, Y
Fig. ßis a horizontal section on the line 8_8 'of
_6;
,
Fig. `9 is asectionfon the line `9-,9 of Fig. .5;
and,
^
Fig. 10 isa section on the line lil-¿I0 of Fig.,»1.
Referring more particularly to thedrawings, a
portion `of `a metal cutting machine is shQWn, pro
August 215, 1,939, and now Patent No. 2,283,240, .10 vided yvitha cuttingtool vembodying the _present
Y
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invention. The machine ,may be of the character
Q_ne object of the inventionresides inthepro
,as more particularly 44described in my prior Patent
,vision of a tool which is particularlyadapte'd to
No.` 2,283,240. The numeral |16 vdesignates a por
_carry out contouringor >die sinking «'.ìperationsy
tion ofthe frameof such a machine, this fframe
Vofthe tcharacter,referred to inmy prior patent
being adapted tosupport a work carrying `>table
apoye mentioned.
which
can be moved in ahorizontal plane„prefAAnother object is theprovision .of atool adapt
Íed to -providea rapid.intermittentcutting opera- . erably under the lcontrol vofarecord operated de
.greeted Mey 19.19.42.
lvice. However, it will beobvious .that the work
A._tion, Hwith .the
.Work ,and -.tool , relatively located
can be moved in any> other suitable manner. »As
`by means `~of a guide bushing aiîording a guide
.20 the vWorkis moved,V it. is >supported from ubelowfby
orl supportiorgthe tool atV a pointvery close to the
lmeans of the plate 202, lreference numeralî20|
A_.worlr, >whereby a tool such as an end mill is
being applied to the work itself.'
. adapt/ed tov provide an eifectivecuttingaction.
Another object is the provision of ‘a reciprocable
„rotatable tool-having la, shank arranged in a guide
,bushing and Vhaving , an, enlarged cutting portion
`rat, the end of the shank, in .combination ‘with
v',I‘hetool assembly as >shown in Fig. 1 is an end
~~mill, the tool lbeing given „both a vertical recipro
-catory niover‘nent'` and a rotary movement las will
The Work _is `adjusted I_or
„be described later. ’
Amovedintime with ,the reciprocatory movement
means V.for `yieldingly urging'. the bushing inthe
» kdirection of .the enlarged .cutting portion;
Another object` of the invention is the` provision
,or optimum ,working conditions lof the cutter by ‘ 90
of theiool so thatV the work isstationary during
,the actual cutting portions of the successive cycles
ofV operation.
. ,
.
rI'he Aend _milling tool, see Figs. 1 and l2, is
continuously kñushing ,away the chips and lubri
Amountedfor
both rotation and for reciprocation.
,cating the `cutter to keep thecutting edges clean
yFIld mill 4,0 isv provided with shank 4| of reduced
and keep the .euttercooL
"
diameter vwhich has a ground and lapped fit
Aother objects andadvantagesof the inventiony .35 .Within
a bushing 42,.whose lower end abutsthe
„will A,be Yapimrent
fluted portion 40 lof the tool. The ground-,and
'the accompanyingfrom
drawings,
the „following
andthedescriptionI
appended
.Claims
.
.
_
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“Il
lapped :tit provides a clearance inthe order of one
hundred .thousandths of ' an inch` between g the
„In thev drawings,
end ymillshemkand theíbushing .4.2. In this -Way
Fig. 1 is a vertical transverse section through
tool is >accurately centered in the bushing
theupper, part ,of a cutting machine ,having cut-f" `the
and substantiallyno >side play is present. jBush
ting .means embodying lthe .present invention;
Fig. 21s _an'enlarged view _of aportion of V,the
ing v42 is also provided with a ground and lapped
.fit withinpan outer guide lcollar 4,3` having an en
_machineshown
1;
loweruend 44 _with a precision lapped nt in
pige is aifra‘gmentarysecuon view illustrating 45 larged
a seat 46 of a clamping sleeve 41. :The upper _end
vl.the mounting ofthebottom „portionofatoolfor ' of collar v.43 also> is l provided „With >a precision
$1.1@ machine;
lapped Viit _Within „thesleeve 41.
`
1
Fig. 4 is ahorizontal sectional view onthe line
v.Lubricating means are provided „for insuringan
,
oflubricant to the bearingsur
Fig. v.5 is a sectionalview 4generally similar to 50A >adequate,supply
faces `of ,the tool and its mounting means, Be
„,Fi‘g, ,1, showing the> Aconstruction `andmounting " tween
bushing 42 and collar 43 an oil passage is
I.ofpa piloted end mill;
‘
IFig. >6 isa. ñgu?e ciview similar to Fig.r5, show
ing .the construction _andmounting ofa Äpiloted
«f_broách:;,~_
__
ç
f
provided at either side by means of vertical
grooves 48 in bushing 442, communicating with
.annular grooves 49 in'collar 43.` From upper
55 groove 49 aLplurality- of radial passages»- 50 lead
12,404,149
3
4
work when not clamped thereon to prevent chips
from the upper rends of vertical passages 48 to
entering between the surfaces of collar 43 and
the work.
Means are provided for circulating oil under.pressure tothe work to flushaway and dispose
of the chips which would otherwise interfere with
the cutting operation, and to keep the cutter cool.
Oil under pressure is forced from pipe 59 through
space 50 and passage 53 into oil space 52. At
an annular groove in bushing 42 about shank 4| `
to supply oil to the bearing surfaces thereof. The
annular grooves 49 are fed through a plurality of i
openings 5| fromV an annular oil space 52 provided
between collar 43 and clamping sleeve 41. f Space
52 in turn is fed through radial passages 53 from ¿
annular groove 54 on the outer surface of clamp‘
ing sleeve 41, which communicates with vertical
the lower end of space 52 an annular groove 232
passage 5tr in bearing sleeve 51 press fitted in arm io Vrin shoulder 44 is provided from which a plurality `
'58 of frame I0. rlîhe oil is supplied through lead
pipe 59 in a manner later-described,r sothat the
ofdownwardlyconver-ging passages 233 lead to
the lower surface of collar 43, with their lower
ends converging sharply to direct the oil against
15. -the cutter. Certain of the passages 233 are
bearing surfaces between bushing 42, collar V43, ~
sleeve 41 and shank 4| are all continuously sup.
' plied with lubricant.
The normal position of end mill 40 with respect
Y always vOpen. toi-spray directly against the tool.
In-addition radial grooves 234 at the lower end
lto bushing 42 is shown in Figs. 1 and 2 where the .f . of each passage 233 provide for feeding of oil to
bushing 42 is against the shoulder provided at
the upper end of the fluted portion where itv is
the tool even when the direct spray is prevented
by the work, and the tool is withdrawn immedi-V
maintained by springA 0| compressed between 20 ately above the work. Thus the cutting edges of
bushing 42» and the hub 02 forming part of a uni
the tool are always cleaned of chips and a low
versal joint 63. Thel upper side of universal joint
cutting temperature is maintained.
63 `is connected `to a tubular rod which is con
y
Referring to Fig. 5, a, Apiloted end mill con
struction is shown in which the end mill‘is posi
nected at its upper end by universal joint with
"a suitable drive shaft which serves to rotate the 25 tively guided and supported both above and be
end mill through the drive connections described
low the work. The tool includes shank 410 which
f »andusually the rate of rotation is in the order of
is secured by set screws 411 in hub 02 of a uni
l1500~>to 2500 revolutions per minute.
versal joint similar to theconstruction shown in
Y' The'entire tool assembly is spring urged down
Fig. l. The shank 41.6` is guided in the Asleeve'42
`«wardly and its vertical movement is- controlled 30 in the same manner as in the previously described
" throughpower driven cam means and» a counter-`
Vend mill and is provided with a iluted portion
418r and a lower pilot 41S. The fluted 'portion
418 is shown in aposition raised above the work,
inwhich position the lower pilot 419 is Still slid
acting-»spring means one oi'which controls the
- upi movement and-theother the'down movement
off-Ȏthe-"tooLl The tool'dr-ive need'not be further
explained here'as it is more »completely described
in? my prior» patent above r-referredfto
ï
ably engaged with a die 480 with which it'has a ~
f ground and lapped fit. The die 480 has a ground
" The sleeve 41, see Fig. 1-, is-»provided with a
and lapped fit >within the collar 203 which is simi
lar to that shown and described in connection
posedvratchetwheels |3| and |32which are sepa
with Fig. 3. Asv shown, the» fluted portion 418'is
ratedby acollar` |33 and secured by a clamping 40 provided between machined annular grooves, and
operated
to
«collar |34. V'I’heseratchet wheels arev
provides end cutting edges at its lower end and
provide a rotationalfcontrol- of the sleeve 41.
a shouldered stop for spring urged bushing 42y at
pair ‘of vertically spaced apart >oppositely dis
A Above the ratchet wheels, thesleeve 41 is provided
with/¿collars which VKprovide thefwork clamping
meanshoperatingto positively hol-drthe work
vagainst movement during the cutting `*stroke of
itsV upper end.
workA whilethe tooliis out of engagement there
with to >pe'rrnii‘fthe step-by-steprmovement ofthe
50
-
` It will be noted that the work 20| is positioned
between the> work clamping sleeve 41 and flange
202>of lthe work supporting collar 203.Y Collar
203y has a lapped precision 'fit within bushing~206
which-is pressed in boss 201 ofA arm 208» ofthe
frame l0. The arrangement kis such that the
_
tion of` nut 491 is maintained by spring urged
always supported by the collar flange 202, rather 60
clamping of the work bygguide collar 43, its lower
locking pin- 500.
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,
Referr-ing-to-li‘igs, 6 to 8, the broach 498'com
prises alg'shank having "cutting section 50| and
lower pilot portion 502» of‘the'shank. It will be
noted that the successivelyracting' lips of `the-'cut
end surface «projects slightly beyondfthe endsur- I
-
If desired, the machiner may be equipped with
aY broach of spec-ial construction,4 in'whi‘ch event
the depth adjustment control becomes a control
an. annular 'groove engagedrby »a split collar‘499
held in closely.spaced'relationship between nut
491 and the end of ram 494. The operating fposi
»than by therwork table,rwhich-mere1y serves to -lo
cate the work. In order to providefor the actual
i
greaterdepths without side deflection.
At; its'V upper end broach'490, Figs. Bland 8,'has
ing sleeve 41 and work supporting collar Y203an'd
the'fpart'of ‘the work being cut by the tool is
Í'I’heïwork clamping means operates in a timed
relation to the reciprocating drive for the tool,
~
for rotative positioninglof the broach.
work is clampedrbetween guide collar~ 43 in clamp?
Y faceof> sleeve 41.
'
guides, namely bushing 42 .and die 480, the end
mill fluted> portion 418 is rigidlysupported against
side-wise thrust and can'beemployedfor cutting
the tool@ and its» withdrawaland to ¿release the
work.
»
Because both itheshank and ïthe pilotA have
45 ground
and lapped fits` with their respective
tingfsection »50| are made up of a plurality of
65 >cuttingteeth 503 which are staggered Y.from one
-and to' Nprovide for its `clamping movement the
sleeve 414 carries a threaded collar2| |- adjustably
j mounted thereon and held in place by lock nut 70
2|¿2..VV Suitable levers -2|1 through their engage
cutting lip to the next to reduce contactïwilth’the
work and also to 'provide oil passages as Vwill
presently be described.y
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-
j
To i provide forv mounting 'of' the broach' for end
wise sliding movement 'butvv to prevent rotation
f exert. «a downward"y thrust on sleeve `>41 sor that
other than the record-controlled ï positioning
thereof,v the broachi» is provided with opposite 1on
the‘work.: Dur
vguide collar 43 is“pressedagainst
`
gaged by opposite keys 501 of respective upperand
ment with theY upper flanged faceof collar 2||,
LingV normal operations,y .colglanI 43
_floats ’on the ‘»
gitudinal 'Y key-Ways ï 500 which» are' slidably f en
v2,4.;04449
5
iò'wer die" assemblies-toa; :sus .which are» mention
'in construenous` K_eys‘soir have upped nts in lthe
upper end, (see,1ï‘ig.'2f)".j;.'1‘he resulting; angular. po.->
sitioning on misalignment f'of; the` tool shank-is ac
commodatedíby -the :universal joints. Linï its.. drive
keyways. " Each die» =assembly includes 'split die
segments 5`|| between which the keys 50'| are held
and about which clamping'ring 5|2 engages. ",The
die assembly is constructed as follows: the keys
'501 are rplaced in position between'the die seg
as described in my prior patent...v -l
'_y g
' , : . îv ' I -.
, `Inthe .end milling` and broaching operationsthe
Work is clamped rigidly between guide. cr`J11arq4I‘l`
and collar 203 while the cutis being..madefand
mentsf5|| inside the'ring 5I2, whichisshrunk
the tool is being withdrawn and is thereafterffree
onto the inner assembly and thereafter 'ground
for' accurate _feeding movement prior. to the next
with respect to the center of the >keys to provide 10 cutting stroke. Because. the ‘end mill-issp'ring
‘an accurate lapped lit within the `sleeve >4l and
driven in its downward cutting movement, zthe
the collar 203, respectively.
l ‘l » I
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tool will not be broken if. presented to a greater
' 'The cutting portion 50| has a closeclearance
thickness of metal than it can cut. The cutting
with respect tothe «associated die segments, whne
of ¿the work takes place at a pointïver'y. closely
the"v opposite rounded* portion 4has substantial
15 adJacenty to, the i bearingësupporti l or „ guide" bush’
clearance providing an oil passage entirely around
mg to'prevent any lateral deflection of fthe to'ol;
In actual .practice precision iinish'esï have been
obtained with, for. example, a IA'/ cutter working
_the broach while it is withinr `thedie.` To supply
oil'to the lower die assembly to flush andiclear
,the breach, the die segments _5H and ring 5|.: are
provided with aligned radial passages 5| 6, which
communicatewith annular passage 5|'|, having a
seriesV of passages 5|8 communicating therewith
through 1" steel that.ïcompare‘favorably with'
20
constitutes a preferred embodiment of the inven
tion, it is tobe understood that the invention is
from an> annular passage 5|9 in collar 203A which
is „supplied with lubricant >under pressure from the
pìp‘e1520.
.
.
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notlimitedto .this precise form of' apparatus, vand
26 that. changes may be made therein with'out‘de
_The' upper die assembly is provided with oil
parting from `the scope óf the invention which 'is
through _the same channels as the end‘mill and
the oil is continuously forced out through the d1e
assembly around the broach by the pump- pres
sure, and additional pressure >is provided by the
rain 494vupon its downwardvmovement when the
breach starts cutting.l
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precisionground
' .While the formsurfaces.
of apparatus
`
herein:
- 1 ' rdescribed
defined in the appended-claims.
:
What'is claimed iszÍ»
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1v1. In a machine,- of >the vclass described; a’ re
30
ciprocable tool having a shank and- 'anïenla‘rged
cutting portionproviding ía. shoulder b’elòwis‘aid
` shank,
tool
meansv
`
r mounting*_
»
including a support
' To." provide for rotative adjustment of the
having an ‘ :axially '.‘movable‘ guidé "bushing- en_'
broach, upperdie assembly'j 500 is connected by
ld_ovvel Din 52| to sleeve '4l-,1. and'other clamping
screws, may also be provided Wengßgeihe 'iop
groove Wall .of the die, see" Fie. ¿_1. "lf‘hus-»the
broach can befrotatively adjustedstheiçWer dle
gaging said shankabove said> cutting pf‘irti‘onÃfor`
relative endwise movement ofthe shank inthe
bushing,- and'mean's urging'said bushing against`
said shoulder, whereby 'saidto'ol'is supported 'adi'
.assembly ’rotating freely 1119992?? 2,93 Simultane
ously with- the rotativeadjustment'of the broach
.2. In combination, a reciprocable toolfhaving
jacentsaidcuttingportion.
40
‘f
'i
i
a shank andan enlargedcutting~ portion; a‘gúide
and the upper die assembly. Lower die assembly
bushing: engaging said shank and"providin`g for
EUS-pmjectsslightly above ,the> collar 203 to secure
the clamping thrust from sleeve 41 through the
rotation and.` relative endwise movement'- of the `
tool, a'supportïfor said'guidebushing;` and Imeans'
upper die assembly 508.
for yieldingly urging said bushing in said support
If desired, the machine may be equipped with 45 tiin 1the direction of the enlarged portion of the
a center drill for locating the centers of the holes
in the lower surface of work. -For this purpose
>3. In combination, a rotatable end mill having
a shank and a milling end forming a shoulder
the sleeve 525 below the collar 203 is mounted for
thereon, a guide bushing in sliding and rotat
endwise movement, and carries a rotatable sleeve
521 which is journaled therein by spaced bearings 50 able engagement with said shank and adapted ,
528. Bearings 528 may be pre-loaded by means of
to abut against said shoulder, and work clamp
1ng means slidably and rotatably guiding said
screw retainers 529 which may be locked in ad
bushing.
v
.
justed position in the same manner as retaining
nut 491. Shaft 526 extends through sleeve 521 in
4. In a machine of the class described: a
which a suitable center drill v530 may be remov 55 frame having work supporting means thereon
andk an apertured portion spaced therefrom, a.
ably mounted. A special screw-connected exten
sion 526A may be employed for installing and re
sleeve mounted for endwise sliding movement;> in
said apertured portion, a collar secured in said
moving drill shaft 526. Shaft 526 has a ground
and lapped fit within collar 203 and projects'up
sleeve; a `bushing mounted for endwise and ro
wardly into a die 53| having radial passages 533 60 tative movement in said collar, a reciprocable
for supplying oil to the drill.
tool having a shank slidably and rotatably en-`
ToV provide for vertical adjustment of the center
gaged with said bushing and an enlarged lcut
drill the sleeve 525 may be provided with a rack
ting portion providing a shoulder for engagement
531 engaged by pinion 538 carried by a shaft 539.
by said bushing, and means yieldably urging said
Shaft 539 is journalled in boss 201 and has a suit 65 bushing to follow said cutting portion.
able hand wheel for manual raising and lowering
5. In a machine of the class described: a
of the drill.
frame having work supporting meansV thereon
In order to provide for an adjustable angular
and an apertured portion spaced therefrom, a.
clearance in cutting, blanking and punching dies
sleeve mounted for endwise sliding .movement
or to provide draft for other dies, patterns, or 70 in said apertured portion, acollar secured in
molds, a special guide collar 43A is provided hav
said s1eeve;ra bushing mounted for endwise _and
ing its outer surface and ends identical with the
rotative movement in said collar, and 'a recipro
standard collar 43 but having the axis of its cen
cable tool having a shank slidably and rotatably
tral bore extending from a. position concentric
engaged with said bushing and an enlarged cut
with the lower end to an eccentric position at the 75 ting portion providing a shoulder for engage
oo .
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zizi/begins;
7
` last liaxinggoilïfaconductin‘g: passagiesâthereixifiwith.
movements means fr urgingff said bushings» ëgßmäs‘e'
l thetoutletginësaid collar.fdirectîngáthefoiL-towatd»
ï said cutting portions
6; f .InaY asmachineffof:
`
'
said . sl-ioulde'rf»y ands a-à- Work». engagin
~
classi# desci‘ibed;
»clampingv t
membenfinafwhich @said-s.gnidetv bushing?> istsl-içlablv
i‘e
l c'xprocablœtoot havingsa :shank andfanzëenlai‘ged ‘
carried:fortendwisezmovementáf1
»
4
Y.
10.»‘In combination,ga;,reeiprocableá«tool/:having
aishankfandf. anafenlazegedfv cuttingfppptionßáangmide
bushing ».-engagfingf .said ,shanksandc-,pi‘ovidingg for:
' cuttingïportiomprovidin 'iacshoulder belowsaid `
wor-k1’ engaging-t1 clamping@ member-î a:
rotation f.; and@ relativei endwi-sa. movement.- of/Vlf the
tool, lsaivzl'f:guide-fbushingffhavingffa?fdiaisnete _subis
Dßrtemimsaid;clampingßmemberi and AVnioimzti'ng
stantially »larger than theaïdiameteng.oafwttíétcutê
` sains tool-§-A fomu reeiprooatiîomaj mea-rissv yi‘etdingly
tingzyportionsf‘.- of@ - the-2> tooL» r_means ,forn .vyieldiïnglyë
\ urging-'1said?lcmshingwE againstiçsaidashouldeníandàa ‘
n series'nof‘:oiltpassageseins saidfamountin'g- means
hagvingg, their ‘1i outlet;V ends: in „ radial;A array?? about 15
t saint tool to; directzstxteams.; off? 011;, against :said
` took' during athefrccuttinge ’operation?.` thereofaîï
urgingfisaid bushing itowatdsithegenlatged; portion
oftitheatool, „and -acsupporteintvvçliicln-saidiguide«
bushingiissmountedsfor l'gendwise». movementîß.
751m.. combination, c at. reeiprocablee rotatable
3 tool;-Lmeainssmountingf;saidstooliifonireciprocatïon'
1 and including a work clampingtcollar,sanft-ame v20
1 portion :in f which f said acolla'nfistf gui‘declîfoijf;r axial
Á movement,v l, saidsfi‘ame portion «_,havìiflggî ' ail fluid
supply; passagaf- an,annulalu'zA chamberaiinvsaidcoI-.i
` 1an, in :communicatiomwith: the: kiiuid-î suppllyìfpasz
ani-2|;A a cutting; portionv intermediate; sani.lfslianlcv
portions, , means ioperablyï» com'iecte'dff~ toi one); of
saidfàshank- portionstfon‘reciprocating, tl:i'e„v töo'l,
guider. meansacontinuouslyî- engaginga oma` of '1` said ’
.shanlb portionsf and; \. providing K-ï for'Y relative. axial
and rotational movements of the shankic-portion
sages of: the frame Lportion :-; throughout. aziz. range
i of vrnelativefmovementY ofthe collar 'andy a:.».series
` of oil passages in said amounting@meansfextendr5
thereinf and; .guide-,means_it‘for. continuou'slírf giiid‘á
ing from said chamber and‘vhavìngeitheirîoutlet
endsçinwardlyfdirected and in> radial arrangement
ments sof: the; said»4 other.A slfíanlíll 'po?tión‘ Atlíerei?
ingi: theeother> of-"said’läs’hankï portio'nslf. andî‘pi'œ
vidingg fon relative.v axial andLrotatiónalÍmové-î
l aboutäsaidtgtoolfftœ' Idirect; streams âofsì pill-:against 1 30 and .» cooperating~,» Wittig.;thev ñrst‘. manned"f guide
saidtoerig.duringïtheicuttingmptrattiomVJ
" »
Y
meansqto determine theîaxisßofltlié tool'lî'ï¿
n
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12. In a metal> cutting mac-hingen’ aid'all'í
Bfllm a@ maehinezëofiithei classndescribemnszre;
cipyocabliettook;meanssmounting:‘saictstootí' for.
reciptocable;> and; rotatablef mill'í?gï; i'lò'ol"v having
‘ .recipifocation .vmcludingt atworká .clamping ‘colla-ra
and :a: ' ser-lest. of?> oil:> passages; im said: mounting 35.
shankfportions extendin’glf?om saidïcuttîrí'gl'ipor;
saidîcollarvandtdirected towards .saiditoolfg said:`
outlet ends including radial.:recessesfinstheiworkengagihgì f‘aceäofff` said-'g collanr extending .to 'the
gagingf.. lsaid tool> th?oughout and.axialÈsti‘okev andv
cooperatingr with.. bothl „saidf shank/portions." to
mount vtheltoogl axisßin aîpredéterminedlocation;
as. cutting portionv », and ». Having ,L upper'f‘and »lower
meansthavinggtheitsoutlètïendstradially disposed»`r
40,
tion,.„ spacedv apart ali‘g‘nedoguíde' means v"-bbtlf "en=
and @means supporting. `onelof4 said""g11îde"means
fonrelative«endwiseïmovementf'
ing; a1- shank-f. and amenlarged;icutting„pml'tmnfy
ppovidingl'. at: vvshoulder-5ilcxelievvf». saint:A
took
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