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Патент USA US2115319

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Filed Julyv 25, 1956
matted Apr. ze, 193s
y 2,115,319 ,
intima rr. non, Hmm; rex., assigner' to Gray“ . . ’
Tool Company,~ Houston, Tex., a
'Application July'zs, 193s, ser-nim». 92,119
1 claim.
(ci '1v-ss) "
My invention relates to boring tools lfor» use ~in
machine tool operations.
posite end’of the body> I has a shoulder I0 which
serves as a bearing for one end of a compression
The device is particularly designed for forming
or boring tapered holes in tubular> members. ,
5 ‘1t is an object of ‘the invention to provide a
vsl’frong'and efllcient tool fortapping a tapered hole
spring I I, which is fitted about thestem 1 ofthe
vmandrel >and bears at its other end against the
end of the chamberland holds >the mandrel re- '5
`siliently forward, thus tending to hold the shoul-l
in a `tubular‘meinber such as a 'tool joint, cou- ' der l in contact with the’nut 9.» l
-‘: v
p_ling or the like.’ and to _so control the cutting `4 lOn one side of the mandrel is formedga longi
member that the taper will be uniform and pre- etudinal groove »or channel I2,. 'which tapers in»`
10 cise. '
l `
depth in either direction butI` have shown it _asm
It is a further object to'provide a tool v"of the tapered from the ou'œr end I3. inwardly along the
character stated which will hold the cutting bit i‘ace of the mandrel to a point closely adjacent the
in _stable position axially of thework so that no inner end of the body 5 of the mandrel. At that
variation inl the cutting performed' by the tool point a shoulder Il on the mandrelrforms ‘the
15 will occur.
end of said groove.4 `Where the groove isgformed 15 `
~ Itis an object of the invention to provide a
in the body 5 of the mandrel thegl‘OOVe iSÜlmder
boring tool which willl properly prepare a tapered
hole to receive a tapered tap. such as is used to
cut oil countryV threads.' By means of tapers
'cut at I5 to infcrllt with cutter block and to form
a mortise or dovetailed groove indicated clearly in
Fig. 3, in which the inner end of4 thecutter’sup
within the housing of the tool a single cutter bit is
porting block I6 may move.y The wall of the nous-"20` '
ing adjacent the slot I5 is formed with va remov
20 Ñfed at a ñxed rateV and taper into` the work. ` By
‘means of Vthis single narrow bit less power is r'equired to perform the operation, and at the same
time the tool may be quickly and easily refaced in
case foreign matter or hard spots are encountered
25 in the work.
In the drawing herewith, Fig. A1 is a side elevation of my improved tool.
able plate I6 to provide access to the interior of
the housing at that- point. As will be seen par
ticularly in Fig. l, the plate I‘I nts within a longi
tudinal »slot vin the housing and is held normally g5 V
in position by transverse pins I 8 which entend
through the walls of the housing and through said
plate I8. To accommodate the use of the .locking ~
Fig. 2 is a similar view partly in central vertical
30 section and indicating the manner in which the
tool is anchored in position-
pins I8 the outer wall of the housing is grooved
as shown at I9.
Fig. 3 is a transverse section on the plane 3-3
rectangular in cross section as will be understood
0f Fig- 1Fig. 4 is a Similar Section on the plane 4-4 of
from Fig. 1 and projects through the wall of the
housing so that its outer end is» flush with the
Fig. 1 and looking 1n the direction of the arrows.
MY boring *P01 LS adapted Wb@ afnchored ,in a
machine tool in the usual-maner.
Outer' surface thereof~ Said block has an anti_ 35
friction bearing as shown at 20, which allows the
There 1s a
said block to be moved muy inward during
tapered shank I which is shown in Fig. 4 as adapted to engage within an opening 2 in the stock of
the cutting operation under pressure.
It wm be understood that, upon assembly of the
40 the machine. It hasafl‘ictional ñttherelnsothat
itis heldin stationary position The tubular body
3 _Ofihe i001 is formed with “n axial ,îîambeï ‘
'I'he cutter supporting block I6 is approximately `
tool, the plate |1 is removed and the block le, k40
engaged with the sndeway |5, may be moved
through the open outer end of the slot in the
gîhzrïs‘gä‘ätâlîvwïgââïâlgïîäèmn â 529g; tubular member and against the closed inner end
45 end extending within the shank l, this reduced
` extension bemg adapted to act as a' guide n_n- t‘he
stem 1 of the mandrel '
l drical shape a nd adapted
said stem 1 is of Gym
to slide within the recess 6. YThe body 5 of the
50 mandrel is enlarged in diameter as compared
with stein 1 and nts within the cyundrical cham-
The plate '1 may the“ be Secured@ 45
k Centrally of the supporting block I6 is a cutter
2 I. Said cutter ñts within a rectangular opening
longitudinally of the cutter block and ‘projects
the required
distanceto. cut the largest 50
diameter 0f the tapered Orenins which is to be
ber l. rt has a. shomder s at one end adapted to formed in the work AS will be Seen from Fir.v 3,
contact with a tubular nut 9 threaded within 'the outer end of the cutter 2l is relieved in one
the end of the housing 3 and limiting the move- direction to form a cutting edge in the usual man
55 ment of the mandrel in that direction. The op- ner. This cutter isheldwihinthe block by means 5s
of a. setïscrewfîlfwhich-allows its removal and
replacement when desired.v 'n
y "
tively and uniforrnlyvby its engagement inthe e
groove yIl of the mandrel Vvto cut'a uniformly "
spaced.V rearwardly away from the cutter 2| is ,
' an 'outwardextension’ 23 on_ the1 housing.
of uniformity
in the.
in thektapered»
so’> that
no tap
is held
cut 'byfA
in . l
flange or extension serves as a mounting ffor a
> cutter!! and a‘esecond cutterl 25..l Thegcutter 2l the tap Vmay occur. Theencl o! the >wort: isre
extends longitudinally througntnenange n and e cessed and smoothed en py me cutters u and` :l f
’ vhase. forward cutting’end shown rat Nein Fig. l, ~
so that all that remains to be done in connection>
which is .adapted„.„to. engage the end of vthe work .with
the work is4 to thread thegtkßperedarea Il.
atV the properytimeïandï recess >.the end' thereof.
The advantages er rhisiweonstrúetion will- befoh-`
The cutting Ãbiade 2l pexends radially ` outward
yaway from the housing and has a'forward cut-_
ting blade Il, which smooths on’ the'end of the:y
workat the proper time. 'ï
. u
:It is also to be noted that thisdevice lmay be `
>"adapted'to rotate where V.thefworkis stationary., v ' ï
'form of machine is'rnot uncommon and f’
In the operationl lof the’ìfdevice thew which need not be illustrated.v Also, the’inclinationïof
is indicated generally by tlie broken lines 2l may ¿thefrecess
cutma'y( be `a flaring one insteadíof
be., rer example; a tooijelntwitmnwmeh a te: *
`tapered simply by reversing'the direction oi' in-` ‘ï
~ . pered recess is to' beïformed.
work'ls heldj„
vclination of the groove i2 in the mandrel. J -I do>A`
in the., lathe in the usual manner and rotated, not therefore wish Vto be confined to the'exact
20 aboutthe tool by the usualmea‘ns' not hereillus
details îof the` embodiment of the invention herein
Y "tratedf During fthe" operationl ofthe device_.__the
rfurthenthun‘is setsiorth in’ the claim ’
.shanlgflzlof the tool is movedgradually. toward vdisclosed
which follows.
the worin-.ills’meÍ work isrotateed the cutter zi . Whatis claimed Las new is : .. »
' will l engage .on.» the ' inner lace thereof; e 'and ¿cut a
Y er me elm _descnbegi eompnal?’glaïlpalr
recess. indicated iat.” in Flg.«.2 within-.the work.' of< Awel
of whichjone has a tubular portion _
rAs the vend/LII Lof :the-mandrel is statilonary?‘the` telescopingly receiving "aportion of `the other,
movement of thefïhousing-v-longitudinaliy¿against ï
slot having
_being )providednwith
open puter ~,end
the action'off. the `spring il ïwilllmolverthe cutter extending,
y’. l , along . the groove gil ~ ïand, » duel' toï'_¿t'he>_-{inc1lnation
' ¿1110 V.of l the i said groove,` ...the y cutterv‘will-,be gradually
yclosedfinner end, theinner`r ofgsaid members hay# .f.
moved'finw'ardlyand therecessïln theworkshown Y lngÍ-av longitudinally 'extendingï undercut-"alideway i»
j . at Il_ïwill taper/as' shown by the ¿dotted line ¿in ..¿within
tiver to the
.thesaldtubularportion-andinclinedrela.tool @nays cutter block, slldabie .inf'j „'f.~
'1 Fig. 2. ywir-entire tapered recess unas. been-.eut . said slidewayy,andeinterengagedyithj the latter "
- to thexproper.depthfthecutter “and y,the _cutter 1
so Vas .to be radially- displaced .upon Í yrelative vxx‘io've- '
.ment in .either
Sßìd. block>
upon assembly of themto'olï
saidgg..l . : v.
2'4"f will: cut an .enlarged ¿ recess ¿shown f at _IQ inl .slideway,
ï 25. :will engagefthefiend ofl the work., The-cutter .
engerandjtneeutter zl‘ wnltnen smoother: the
Y ‘end offtheazwork. and the.51ob.will ~be„finished. ;v
movable , through'4v
slot . to ,y theclosed 7
`inner-«end ofthelatterwhileengaged. withfsald y f
means securable to’said tubular member `
tracted»y so as to « withdrawl-»the »tool yfrom . engage#
to extend across vsaid slotforthepurpose of. i-'e`f-¿
nientfwith the workland by theusual manipula `taining
tions. oi' » the' machine parts `the work *mayy Abe re 'means' urging'said members 'A apart, and means
. The device holding-'.thershankflfwill thenvbere
' limiting movement of said members apart. .. j . y.
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