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Патент USA US2406326

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Aug- 27, l946~
` .2,406,326
Filed Jan. 19, '1944
Patented Aug. 27, 1946
Herman J. Engbrecht, North Hollywood, Calif., as
signor to Bendix Aviation Corporation, North
Hollywood, Calif., a corporation of California
Application January 19, 1944, Serial No. 518,839
5 Claims. (Cl. 90-12.5)
This invention relates to tools for accurately
cutting or finishing surfaces in valves and the like '
and is particularly usefu1 for reaming a surface
in concentric relation with another surface or
An object of the invention is to facilitate the
rapid and accurate cutting of a surface in con
centric relation to another surface.
l A more speciñc object is to provide a tool for
cutting seats in valve bodies and the like which
tool positively aligns theÁ seat in true concentric
relation with the passage or passages leading to
the seat.
' Other more speciñc objects and features of the
invention will appear from the detailed descrip
tion to follow. ,
It is common in the construction of hydraulic
valves >to employ two aligned bores of different
Fig. 4 is a side view, part in elevation and part
in longitudinal section of the collet.
Referring rlrst to Fig. 1, there is shown, in
broken lines, a valve body III having a small bore
II merging into a larger bore I2, which extends
to the outer end of a tubular body portion I3,
which is externally threaded as indicated at I4.
As these bodies are received for finishing, the
small bore II is approximately aligned with the
bore I2, which in turn is at least approximately
aligned with the external threads I4. To finish
the body, the smallbore II must have a conical
seat cut therein at its outer end, which conical
seat should be in alignment with both the axis
of the large bore and the axis of the threads I4,
if the bore and the threads are in perfect axial
alignment. If the bore and threads are not in
perfect alignment with each other, the axis of
the seat should be midway between the axes of
the smaller bore where it merges into the larger 20 the bore and the threads respectively. Further
more, if the small bore II was not originally in
bore. Heretofore, it has been the practice to
accurate alignment with the large bore I2, and
ream the conical seat and/or the smaller bore
external thread I E, it must be reamed to place it ‘
with a reaming tool admitted through the larger
in alignment.
bore. However, the prior methods did not pro
In the particular valve body IIJ shown in the`
vide any positive means for aligning the tool with
diameter with a conical valve seat in the end of
the larger bore, the skill of the workman being
relied upon to so support the reaming too1 that
the Vresultant reamed surface would be reason
drawing, the left end portion of the large bore I2
is of slightly smaller diameter than the re
mainder, but this is of no particular moment in
sofar as the present invention is concerned.
ably accurately aligned with the larger bore.
These previous methods have been unsatisfactory, 30 l A too1 in accordance with the present invention
for cutting a conical seat in the right end of bore
not only because they required a considerable
II is shown in full lines in Fig. 1. It comprises
amount of skill on the part of the workman, but
a hollow body member I5 internally threaded at
were slow, and, where accurate work was de
one end with threads I6 that are dimensioned to
manded, there were considerable numbers of re
jections even with eflicient workmen.
35 rather loosely engage the threads I4 on the valve
f body Ill. Adjustably fitted in a smooth bore in
In accordance with the present invention, I
the outer end of member I 5 is a sleeve I'I, the left
eliminate the need of specially skilled workmen
for performing this operation by providing a seat
end of which is chamfered or beveled to form a
conical surface ñtting against the beveled inte
reaming tool which has a guide structure expand
able to wedge in the larger bore so that there 40 rior end of an expansible collet I8, >which is
adapted to be expanded against the large bore
, is no possibility of the reaming too1 being mis
I2 of the valve body Ill. To this end, there is ac
aligned, even by unskilled workmen. I further
provide for the rapid assembly of the reaming
curately fitted within the sleeve I'I a tubular guide
I 9, which extends through the expansible collet
tool in the valve to be reamed, by utilizing the
usual threads on the valve body for expanding the 45 I8 and is enlarged at its left end to ñt loosely
guide in the larger bore.
within the reduced end portion of the large bore
I2. At the point of enlargement, the guide I9 is
A full understanding of the invention may be
smoothly tapered to provide a, flared or conical
had from the following detailed description'with
` `seat 20, which cooperates with the <seat 2 I on the
reference to the drawing, in which:
Fig. l is a view part in side elevation and part 50 sleeve I'I to expand the collet I8 when the tool is
in section of a tool in accordance withthe in
vention for reaming a conical seat in a valve body,
the tool being adapted for a valve body with ex
ternal screw threads.
the conical seat at the right end of the small bore
II. A handle 40 may be provided onthe outer
end of the stem 22 to facilitate its actuation
manually, although it is to be understood that, if
desired, the stem 22 can be gripped by the chuck
of a drill or the like for its actuation. In order
Fig. '2,is a view part in side elevation and part
in section of a tool in accordance with the inven
tion for reaming a straight bore in a valve vbody
having internal screw threads.
Fig. ‘3 is an end view of a collet employed in the
tool, andl
, The guide I!! rotatably supports the stem 22
of a conical reamer 23 which is rotated to ream
60 to prevent injury to the conical 'seat cut by the
reamer as a result of accidental impact of the
reamer against the seat while the reamer is not
cause the seat will vary in width at different cir
cumferential points.
being turned; it is desirable to .providea helical;y
conicalï'seat has been formed, asgdescribed with
spring 24 >which’.iscompressed between a stoplâi.
reference toFig. 1, inspection of the seat shows
Therefore, if, after the.
that the small bore is out of alignment Ywith the
secured to the stem 22 and the inner end of a
counter bore 2% in the right endfof the guide ISLJÍÍ. l >large bore, correction is made by applying the
.tool as previously described, but with a straight
This spring 2d retracts the reamer head 23 away
from the seat as soon as the actuating handle 49” " " reamer 35 of suitable size substituted for the coni
The cylindrical reamer
" `VVcal reamer'23 of Fig._1.
is released.
The device is actuated as follows‘zv; É‘irstg. thee" 10 isthen: a‘dvancedrinto the bore IIa for a short
sleeve I'I is properly positioned..longitudinally" ` distance. to form acounter bore that is in perfect
within the tool body I5 and locked into. position. . alignment with the conical seat and with the
by tightening set screws 2l in the body I5." Then
' large b'ore.
Although for the purposes of explaining the
invention a specific embodiment thereof has been
described indetail withv reference to the drawing,
it is to be understoodthat the invention isnot.
the tool is attached to the valve body I 0 by enten` .
ing the inner end of the guide IS into the large
bore I 2 and screwing. the tool body I5 on tothe
external threads I4` of the valve body-I0. 'This
ñrst moves the entire tool to the leftv until ythe
left end 280i the guide I9 `rests against the shoul- i
der. at they left end, of the large bore „lzgwhich 20
limitedto exact structuresv described but. only-to.
the extent .setforthin- the appended claims.
I claim:
l. A tool fcrmachininga body having a-.cylin
stops further movement to the left of the guide. I 9. `
Thereafter, as Vthe tool'body IS-is given itsiinal
' drical bore and screw threads inv at leastapproxi
turns, the sleeve Il is `moved to the left relative
mately concentric relation'tov saidbore, to .produce
in said. body a surface yoirevolution in ,approxi
tothe guide. I9, causing the. conical surfacesZI .
and 20, on the sleeve Il and the guide I9 respec-; 25 mate axialalignment with said bore', said toolv
tively, to expand the collet Iß'tightly againstthe.,
large bore I2. .As clearly shown in.Figs.I3 and..4,-`
the colletIB hasfour slits Sil-.extending ¿from the.,
right end approximately three quarters v.of the way
to the left end,. and‘four slits .3l extending from. 30
comprising: Va'nollow guidedimensioned to enter
said. bore; a rotatable.v tool accurately guided .by
said guide for rotary and longitudinal movement
coaxial with said. guide; andmeans for positively
positioning said guide withinsaid bore, compris.
ing an expansible annular member» surrounding`
said guide and an annular wedgeßmember aligned
with and relatively axially moveable with respect
to said guide, at leastfone of said.. members .hav
the left . endapproximatelythree quartersof .the 1
wayto theright end, the slits .3| being circumfer- y
entially positioned midway between adjacent .slits
30. The colletis therefore free. toexpand, .in re-‘v
sponse to the wedging action'applied thereto by'. 35 ing. a conical surface .cooperativewith the other
member to expand said expansible annular mem
the conical surfacesZII and 2 i, until its outer sur- `
face is expanded. tightly against the., bore'. I2,..v
ber against said. borein responseto relative axial
which occurs when thetool body I5 has been. fully`
As _hasbeen previously
movement cf-.said-members towardeach other,
and means vfor e?iecting. said relative. axial move-y
ment including. means forlimiting» axial. move.
mentioned, thethreads do
I6 inthe tool body I5 .are cut to ñt loosely on the
ment of said expansiblemember into said bore,
threads » I 4 of the .valve body, so that, if the threads:
and nut means adaptedfto engage thethreadsof
I4.are not Aexactlycoaxial'withy the large bore ~.I2,.
the toolbody I5 can cock .slightly with respect
to.threads.-I“I,.i'lo` permit the guide I9 to. assume av
position .in which its axisis intermediatethe. axis
said body, for moving said wedge member-'againstl
said expansible member.
of the bore. I2 andthe threads Iiìrespectively. »
~ .
` 2. A tool asdescribedin claim 1 forreamingY
a Ybody havingexternal threads surrounding saidv
bore, in which said nut .means comprises a. skirt
After the toolhasbeen positioned as described',
adaptedv to .telescope over the» threaded portion
the conical seat is reamed at the right end of the
of said .body member Yand havinginternal threads
small, bore AII by pressing the handleßo to the left. 50
to engage therewith.
and rotatingit. .
.f SpA-tool as. described in claim 1 for reaming- a
The stop 25,. in, addition to .functioningas a:
collar for the compression of the` spring 24„also
bore. is internally threaded, in. which said nut _
functions as a stop to limit the depthof out made
meanscomprises an annularv member dimensioned
body in> which the.. outer end .portion of said large
by the conical reaxner 23. Thus, the stop.25 may 55 tov enter saidlarge bore and externally threaded`
` .besecured to the stem 22 of the reamer by an
to engage with .said .threads in .the body.
Allenset screw 32, and by loosening .this screw,
. 4». .A -tool as described in claim 1 in which said
the stop 25 vcan be so positioned cnthe stem.22
expansible annulanmember- has .two expansible
aste contact the outer end 33 of the guide I9`
annular, bore-contacting faces at-opposite ends
when the reamer has lcut to the desired depth.
`60.. thereof, and.. cooperating. faces on oneend of` said
Referring noW toFig. 2, there is shown a tool
annular member and said guide, and-.cooperating
substantially identical with thatdescribed with
faces on the `other end of saidv annular. member
reference to. Figs. 1, 3 Vand 4 except. that thebo'dy.`
and. said wedge member, whereby both'ends of
I5 is> provided with external threads 34 to iît -in-.
said annularmember are. expanded against ,saidv
'ternal threads 35. in another branch of the valvei 65, bore in. response to thelongitudinal movement of
said wedge. member produced by tightening ,said .
body I0, and a straight reamer 35 is substituted.
for the conical reamer 23 ofFig. l. It may be as- »
nut means.
sumed that in Fig. 2 aconical seat 31 has'already
been reamed at the lower end of the passage IIa
by employing in the tool of Fig. 2 a conical-reamer '
similar 4to reamer .23. lof Fig. l, and that tit has
, 5. At'oolas-described in claim 1 ill-which said
nut means has a cylindrical bearing surface
7.0 closely fitted.. onfV a cylindricaLbearing 'surface'
on said guide whereby said nut means and said
been discovered, after the> formation» ofthe seat'
31,1 that ‘the bore._I Ia is out of alignment ywith the
bore `I2a. Such misalignment can beV readily de-`
guide aremaintained in alinement with-each
tectedafter. the conical seaizh'asbeenV cut, be 75
other, irrespective of.misalinement between' the
bore and the threads of the body to` bemachined.
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