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Oct. 1, 1946.
F. J. LAPOINTE
BROACHING MACHINE
Filed Feb. 10, 1942
2,408,521.
7 Sheets-Sheet l
' Oct. -1, 1946.‘!
F. J. LAPOINTE
BROAZJHING ‘MACHINE
Filed Feb. _1Q. 1942
LIW
817%..“
2,408,521
7 Sheets-Sheet 3
9
Oct. 1, 1946.
F. v.1. LAPOINTE
2,408,521
BROACHING MACHINE
Sheéts-Sheet
Filed Feb. 10, 1942
-
l |¢
l-.rv
INVENTOR.
,
Jlqivozz'zz‘e,
‘ Oct. 1, 1946. '
'
F. J. LAPOINTE ‘
2,408,521
BROACHING MACHINE ’
Filed Feb; 10, 1942
'7 Sheets-Sheet ‘5
‘Oct. 1, 1946.
I
F, JJLAPQINTE '
2,408,521
BROACHING MACHINE
Filed Feb. 10, 1942
7 Sheets-Sheet 6v
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INVENTOR.
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, Patented Oct. 1, 1946
2,408,521
UNITED STATES, PATENT OFFICE
Francis J. Lapointe, Ann Arbor, Micln, assignor
to American Broach& Machine (30., Ann Arbor,
Mich.,, a corporation of Michigan
1
Application February 10, 1942, Serial No. 430,235
16 Claims.‘ (Cl. 90-—-33)
2.
This invention relates to a broaching machine
Fig; 5' is‘ai detailv plan view' of‘the worklholdl
ing ?xture and coolant tube. connection shown;
and“ to a method of broaching‘ by the use of' such
machine, and it is illustrated herein as embodied
in a mechanism designed particularly for pro
ducing the ri?ing'in' a gun or cannon barrel.
One object of the invention is to provide‘ a
breaching. machine‘ in which a series of‘ br'oaches
in Fig; 3;.
>,
‘
‘
'
Fig- 6. is a front: elevati‘on',».part1y‘ in sectibn,.
constituting: largely' a‘. longitudinal extension or. '
Fig. 3 to show the lead screw and ther'hydraulic?
cylinderfor operating thebroacha
is employed in a manner to secure an unusually
smooth and accurate result.
Fig; 7 is a. transverse. vertical; section taken as:
indicated at" line"T—‘l'on“Fig..6.
Another object of‘ the invention is to provide
Fig. 8 is‘ a transverse sectionita'ken as indicated-v
a machine in which. a- series of breaches is em
ployed to complete a piece of work and in which
a rack or support, is arranged to travel with the
moving element of the; machine" so as to be con
at 8-—-8"on:Fi‘g. 6,
Fig. his a transverse section. on a larger scale"
taken as indicated'at. line 9+9- on‘;Fig,..6. ‘
veniently positioned at all times for presenting 15
the broaches when they are wanted for use in
the machine, and for receiving the broa'ches as
Fig. 10‘ is adetail sectiontakezr.asindicatedzat'
1i1‘1ei|a>—'|?'OII-Fig'. 9E.
‘
‘
Fig. 1'1 isa detail/sectionatrline. I |.=*—'l1|.'..0n. Figs
10.
theyfare remove‘dltherefrom.
I
'
1
_
Fig.» 12 is a detail section at- line l2-|.2 on1 Fig‘.
A further object of; the‘ invention is'to provide
a specialuarrang‘ement for supplying coolant .to 20
Fig. 13 is a side elevation; of. the ?rst broachof;
a breach and to: the work during the broaching
the series employed in theig-uir ri?ing: operation,
operation‘.
.
with parts, broken out toicond'ensethei View 10111It: is also an‘ object of the invention to-provide
gitudinally.
a bro-aching machine for drawing‘ a broach
141is across section of: the?rstibroach of
through the, bore of a‘ piece of work to form 25 theFig.
series.
v
‘
.
splines or grooves therein‘, together with mech
Fig. 15- is a cross section of. the; second broachi
anism for rotating one of the’ parts to render
ofitheiseries'.
the resulting grooves or splines helical in form;
Fig; 16 isia cross section of the third breach of
10..
'
.
'
'
and it is a further object to arrange themech
theiseries.
.
'
anisrnt for this purpose in a compact assembly 30
Fig;
17
isia
cross
section,
of
the‘
fourth‘
breach
without undue elongation of" the machine.
of the series‘.'
More speci?cally, it is an object of the invenFig; 18 is a ‘side. elevation of the leading: end"
tion to. provide a machine having a support-for
portion cfa typical brojach.
' '
a workpiece in which a bore isto be broached;
Fig.v 19- is an: axial section 01’. a1 portion of a
together with a tube sealably connectib‘le with 35
certain breach of the series, takenua's indicated
the bore of the work piece‘ and dimensioned to
at line'- I 9-4 9*on- Fig." '17.
'
enclose the breach in its initial position, together
Fig; 20‘ is? a side‘ elevation. of. a1 pull‘ rodiemployed'
with mean-sfor supplying coolant to‘ the tube and."
in- connection. with the breaches; with’, parts‘
to the breach as the latter is- forced through the
‘ broken; out-Ito condensethe-vi'ew.
bore of the work piece.»
j
40
'While- the invention‘ is susceptible‘ of various;
modi?cations and-alternative constructions}. it is
sh‘owi'ii' in thedrawings'and' will be described
hereinafter‘in' a'ipr'eferred embodiment, butit‘isi
Gther objects and advantages of the invention
will» appear irom'the following‘ description, taken
in connection with the accompanying drawings‘,
in-which-z
‘
'
Fig. 1 is a perspective view of a broaching ma
chine embodying this invention; showing at'gun
barrel mounted in position to‘ be operated‘ upon‘
and.‘ showing the broach-carrying rack disposed
substantially in‘ its‘v initial position. in relation, to
the working stroke.
'
Fig. 2' is a similar perspective view of‘ the ma
chine showing the pull head and broach'rack atv
the positions which they assume atthe end of
the working stroke‘.
Fig; 3' is a vertical sectional view of the prin-'
cipal working parts of‘ the machine with portions
broken out to condense the view longitudinally,
and showing‘: a portion of a gun barrelin position
to-be broached,»v
Fig‘.v
45
not‘ intended that the invention‘ is- to be limited‘
thereby to thefspeci?c embodiment disclosed; but;
it' i‘siintendedito coverall modi?cations and-alter-v
native: constructions falling within the spirit-and,
s‘c‘ope'fof the appended‘ claims.
“
vCertain principles offthe- present inventionlwill.
be applicable to broac'hing' operations in which:
straight‘ grooves or: splines‘? are {formed in' the-bore
of a workipiecerbut
the‘machinéherein-shown:
in the. drawings themechanisrn arranged; and;
the‘ breaches. themselves are designectz-for; giving:
a: predetennined. pitch.v to they splines: to produce:
the: helical‘ form: commonly" known as: “mi-?ing?"
as: applied'to a: gun barrel; Assshown. iniFigs-t 1
and 2, the machine comprisesttwo principal sec
tions connected together end to end; these are
is 1a. transversevertical section taken as? 60 the: work table.‘ section : I and thegmechanism- sec
indi'catedat lineill-elli'cnFig 3..‘
tion 2. .A gun: barrel- 3ais1shown=supported=ongthe
2,408,521
q
so
work table | by the insertion of one end of the
barrel in a centering chuck or collar ’4 and with
the opposite end secured in a separable clamp
device at 5. A coolant tube 6 is carried by
brackets '|, l in a position in which it is axially
alined with the gun barrel 3 and the end of the 1
tube is connected with a longitudinally adjust
able section 8 which terminates in a sealing fix
ture 9 directly engageable with the end of the gun
barrel 3. A disengageable coupling I3 permits
liquid-tight connection between the section 8
and the tube 6, and a flexible pipe connection is
provided at | | for supplying coolant liquid to the
interior of the part 8 from which it ?ows into
the tube 6 and into the gun barrel 3 during the
broaching operation. The ?xed support l2, in
4
mechanism, hereinafter described, and each of
the succeeding broaches is provided with a heli
cally ?uted pilot section such as that shown at
25 on the broach Bin Fig. 18. The splines of each
pilot section are dimensioned to ?t the helical
grooves formed by the preceding broach, and the
broaches B, C and D are free to turn in response
to this interengagement of their pilot sections
with the broached grooves in the gun barrel,
Fig. 20 shows the pull rod or shank 26 provided
for the broach A. This rod includes a hollow,
threaded terminal 21 for engagement with the
threads of the termina1 IS on the broach A, and
at its opposite end the rod is reduced at 28, leav
ing a head portion 29 which is engageable in the
pull head of the machine as shown in detail
in Fig. 10.
which the part 8 is slidably mounted, is slotted
This pull head includes a stem 36 with a cy
at l3 to accommodate the supply tube | | and per
lindrical shell 3| slidably mounted thereon and
mit-limited longitudinal movement of the part 8
20 held yieldingly against the head 32 of the stem
in ‘the ‘support.
30 by coiled spring 33. In this position the four
It will be understood that the number of
radially slidable jaw members 34 in the head are
broaches employed in a series to produce a given
held at their inner limits of movement by en
piece of work will vary with the nature of the
gagement of their T-heads 34,1 with the wall 35
work'and the character of the broaches them
of the shell 3| at its smaller internal diameter,
25
selves; in the illustrated machine there is em
so that the inner ends of the jaws engage the re
ployed a series of four broaches, with an optional
duced portion 28 of the pull rod with the head 29
?fth broach which may be used for a ?nal ?nish
stopped against the jaws as seen in Fig. 10. To
ing'operatio'n. Each of the regular four broaches
release the pull rod, it is only necessary to push
includes a series of graduated cutting teeth, and
back
the shell 3| against the pressure of spring
isprovided with a pull rod or shank which is dis 30 33 so as to bring the larger internal diameter of
engageably connected to the leading end of the
the shell at 36 into registration with the jaws 34,
broach and which is long enough to extend
leaving them free to move outwardly. The bev
through the gun barrel for attachment to the
eled shoulder 31 of the pull rod acting against
pull‘ head of the machine by which the broach ~ the beveled edges 38 of the jaws 34 operates to
is'd'rawn through the barrel for its cutting opera
shift them outwardly for releasing the rod 26.
tion; It may be assumed that, as shown in Fig. 1,
The threaded end of the stem 30 of the pull
the machine is ready for the ?rst breaching op
head is secured in a rotatably mounted shaft 49
eration, with the ?rst broach mounted in work
and is interlocked therewith by means of a key
ing position and enclosed within the coolant tube
39 so as to turn with the shaft. 'In order to
6; while the pull rod or shank for the broach eX
cause the pull rod 26 for the first broach A to
be turned by the rotation of the shaft 48 and
the pull head interlocked therewith, the head
portion 32 carries a radially disposed plunger
broach‘ are shown on the ‘rack l5 ready for use as
4| having a .T-head 42 which, when engaged
45
needed. Fig. 13 shows the ?rst broach A as com
with the inner surface 36 of the shell, holds the
prising’ a threaded terminal IS with an adjacent
plunger 4| inwardly to engage the flat area 26a
cylindrical pilot section _|‘|, which may have
of the shank 26. The pull rods for the other
grooves‘ l8 forlubricant or coolant; at intervals
broaches B, C and D are not formed with these
along the shank of the broach A are the cylin
flat areas and are not intended to be interlocked
drical cutting teeth 23 of graduated diameter and 50 for rotation-with the pull head 32; therefore,
with their cutting splines 2| of uniform width
when the other broaches are employed the shell
throughout" the length of the broach. In ac
3| is rotated through a limited angle by its
cordance with the present invention, the second
handle 43 to bring a clearance notch 44 into
broach shown in section at Bin Fig. 15 has a se
registration with the T-head 42 and allow the
ries of splines 22 which are wider than the splines
plunger 4| to move outwardly so as to accom
2| 0f the ?rst broach, but the successive teeth of
*modate the full diameter of the pull rod with-,
the broach B correspond in external diameter to
out interlocking engagement therewith. This
those‘o'f the broach A. Similarly in the broach
leaves the pull rod and its broach free to turn
C. (see Fig. 16) , the splines 23 are wider than the
in the pull head so as to follow exactly the ri?ing
splines‘ 22, but the teeth are graduated through
produced by the ?rst broach A, although the
the same range ‘of diameters as in the preceding
relative rotation between the broach B, C or D
broaches; and, likewise, in the broach D the
and the pull head will be very slight, in view of
splines 24 are still wider than those of the pre
the fact that the pull head will be rotated in
ceding broaches, but the diameters of the teeth
each of the succeeding broaching operations, just
range through the same graduated series. In 65 as it is during the operation of the broach A.
other'words, the ?rst broach cuts grooves in .the
For e?ecting the rotation of the pull head,
bore of the gun barrel 3 to the full required depth,
there is mounted in the mechanism section 2 a
and each successive broach widens these grooves
lead screw 45, sometimes referred to as a “spiral
until the ?nal width is attained, and the splines
bar,” which is ?xed against rotation and against
left standing in the gun barrel constitute the de
endwise movement. The pull plate I4 is secured
sired ri?ing effect. And since this vrifling is to
to the face of a traveling crosshead or hearing
have a helical pitch, all the broach teeth are cut
block 46 in which there is journaled a nut 4‘!
with'this pitch and each broach is rotated at a
threaded to ?t the helical grooves 48 of the lead
predetermined rate. as it'is drawn through the .
screw 45 so as to be rotated about its axis when
75
work. The ?rst broach A is positively rotated by
tends through the gun barrel 3 and is coupled to
the pull plate seen at I4. The remaining three
broaches of the regular series and the ?nishing
2,408,521
.5
_
the1cross'head-14i6 ‘travels along the-axis of the
engagement with the sleeve, :8, also veifecting ."a
‘similar engagement of the terminal 99 with the
screw F45. The nut 1'4"! carries a gear-:49 which
meshes with an idler pinion 50 zbyrwhic'h rotation
is transmitted-to agea-r 15"! secured toithe shaft
40in ‘which the pull head is carried. Theiheavy
bearing block or ~crossheaol 46 is mounted to
travel along suitable vways 2a provided, in the
section ~32 (ofthe-mach'inejand is connected by
an extension or slide ‘i52wwith‘a hydrauliclram
53, as shown in Fig.
The. cylinder 54 is con
veniently mounted in the ‘lower portion of the
housing of the mechanism section -2 and may
extend under the work-table .' pll/iovement. ofv the
ram353to the right, .as seen in Fig. 6,, carriesthe
extension v:52 ‘with it. and-draws the :crosshead 15
“and pull plate 114, together 'vwi-ththerpull head '
3:1, inthe direction-to draw-the broachthrough
gun ‘barrel 3. ‘Reverse rotation of the :handle
.68 will effect aquick release of the coupling am
from the sleeve v8 ‘when the next broachis vto
be installed in working position.
'
,
.Just prior to the working stroke of: the ‘breach,
the rack ['5 stands opposite the worktablesec
tion ‘I in convenient position for the operator
when he is ready to place the breach in the;tna—
chine, as just described. -When.the breaching
stroke has been completed, the. bearing block :46
with the pull plate [*4 and the pull head will-‘have
arrived nearthe ‘remote end ofrtheimechanism
section '2, as shown in Fig. '2, and will havewith~
drawn the breach and its pull rod from ‘the end
of the gun barrel supported .at 4. Thus it isnnly
thegun ‘barrel
.Forconvenience :in construc
necessary to release the pull rodby shifting .back
tion, .the bearing block :d?consists of ‘twoipnincipal
portions assembled facetoziacaand the exten 20 the shell 3-! of the pull head, as already described,
in order to remove the breach from the machine.
sion :52 is connected to {the ,hearing :block by
As
the operator does :this he ?nds thera'ck I15
means -.of .a threaded. stud, seen at 55in Fig. .‘10.
conveniently positioned adjacent the pointat
:To‘facilitate the ‘placing. of each broach :in the
which he is removing the broach, because the
machinein the position :of use, the coolanttube
'?iscarried :by its brackets 7 L011 arod :56 and , ,
the :brackets lsengage said rod Ebyvmeans of rollers
15.8 carried in thezrbrackets so that :therrcd :55
constitutes -a track or :running .rail upon. winch
the coolant. tube-t may be ‘moved :bodily away
from.;the end iof athedgun barrel {3; and when
the tube'? has been 'thussshifted a short dis
tance, .it;may be :swung about-the axis of the
red 1155 and Dllt of line with-the gun barrel so
as. '00 leave the iopen :end :of the barrel ‘exposed
for insertion of thepuill :rod or shank, such as
the rod 26., Elbe adjacent-end 0f the tube 6 is
also left exposed :for insertion of the broach it
.selfpafter :which the breach and its pull rod
30
rack itself is mounted for travel ona running
rail J6‘! extending along the back of .thBtSECtiDI-IS l
and 2. The bracketed forming -_one1en_d of the
rack i5 is securely attached to the bearing block
or head 45. This bracket and the other ~,upright
brackets 69, whichare elements of the ?ame-t5,
are provided with ‘hearingrollers 10 vcwhich .ri'de
upon the rail 61 .asrthe frame; I15 moves back and
forth with the pull. head. Thus the operatormay
easily place on the rack the breach which he. has
just removed from the machine, ‘and the will
then shift the machine into reverse, .caus'ingxthe
block 46 and its pull head to travel iback1to the
I position shown ‘in Fig. 1.
At :the same time,.-;the
rack l5 will move back to a position opposite the
maybe ‘10111.66. :at their threadedterminals, such
work
table so that, as the operator releases the
.as'those shown at l6 and 21 :in Figs. 13 and 20, 40
coolant tube 6 ‘from the end of the gun barrel
respectively, ‘the tube 6 being swung into align
and shifts the tube out of the-way, he can re:
ment with the gun barrel for this purpose, Pref
move
from the rack l5 thenext breach in be
erably, however, each breach :is-left connected
employed and insert it in position.
.
with its pull red, as. seen cn-therack 15 in Fig.
,1, and the ‘length of‘ the track 56 is su?icient to .
permit retraction of the coolant tube ?past the
position occupied by the breach when its =pull ,
rod has beeninserted into the gun barrel 3 and
connected into the pull head, at 3!. The pull
rodand broach will then extend through the
connecting sleeve .Sand beyond said sleeve into
space to a point adjacent, the ,open _:end of the
tube =6. rIfhe tube may then be slipped over
the breach, its brackets l riding along theytrack
156 until the open end of-the tube 6 approaches
the ‘sleeve 8, the latter having been already
shifted :into sealing position relative to the gun
‘barrel ate. The beveled connector It, being
As shown in Figs. 14, 15 and 16, each of lth?
breaches A, B and C has threechannels 75,;ex
tending longitudinally and positioned’to register
with spaces between the cutting splines-11f the
teeth; ‘in the broach D (see Fig. 17‘) "the corre~
sponding channels 56 are narrower than the
channels 15 because the available spacesare nar
rower. The coolant, which is supplied under
pressure‘ through the pipe H to the tube 18,, ?ows
into the tube ‘6, which is closed atits outer end
by its cap 80 and-thus maintains the coolantzun
der pressure as it follows. along the chahnels115,
or 16, of the. broach during the ‘progress of the
' broach through the gun barrel..3. As indicated in
Fig. 19, the cutting teeth 38 are. slightly under
’ tube .5, will have been set’ to ?t snuglyinto the 60 cut at their forward sides 29*‘ adjacent their
cutting edges, but at‘ the rear sides, 29*’, instead
.open end of the sleeve 8 and at this position a
.of being backed up with. inclined portions, they
islidable locking dog 59 is shifted by its operat
:are made with faces substantially perpendicular
ing handle 69 into holding positionin contact
to: the axis. Itis found that with beveled or in
with a collar ‘Gel on the tube 6 and adjacent one
clined backing there isa tendency for the cool
vof the brackets 1,. The locking dog 59 is not 65 ant,
flowing from the rear end of the breach un
.only slidableinto locking position .by virtue of 7
der
pressure,
to force the chips outwardly along
its slot .62 engaging the ‘supporting pin 63, but
the
inclined
backing,
causing them to pack and
the handle 60 is connected to operate a cam
adjustable on the threaded terminal 6*‘ of the
toscratch the interior surface of the gun barmember 64 having a single tooth'65 which ?rst
rel. But with the rear faces of the teeth as
engages in a notch 66 of the 010g 59 to shift it 70 shown
‘in Fig..l9, perpendicular to the axis, these
toward locking position, after which theslightly
eccentric surface of the cam 64 bears against
the tail portion of the dog-59 and rocks its op
posite endagainst the collar -,6!;,~forcing the con
nector‘ Ill-at the end of the tube-into ?rmssealing
faces merely act to dam the ?ow without mov
ing the chips outwardly or wedging them against
the bore of the gun.
,
It may be understood that ‘the vnumber of
7-5 gbroachesemployed
to produce ;a satisfactory re
2,408,521
7
sult will vary somewhat, depending upon the
length of the working stroke, the depth of the
out, and the character of the metal being worked
upon. With the set of four breaches herein
shown, the ?nal ?nishing cut will usually be
made with the fourth breach D, but occasionally
piece having a bore to be breached, a tube for
coolant closed at one end and open at the other
end supported in alignment with said bore, said
this breach may become slightly dull, not per
ceptibly so, but sufficiently to leave slight
scratches On the work.
In such cases the ?fth
breach, E, having its ?nal cutting teeth just a
tri?e larger than those of the breach D, but with
splines of exactly the same width, is pulled
through the bore, thus very slightly increasing
its diameter within the limiting tolerance and
cleaning up any imperfections in the surface.
But on the assumption that the breach D will I
usually make the ?nal cut, it may be explained
that the graduated series of teeth for breaches
A, B and C vary in diameter through exactly the
same range, while the ?nishing breach D has a
few teeth at the larger end which are slightly
larger than the ?nal teeth of the other breaches.
The pilot sections of the ?rst three breaches have
body diameters which are all slightly less than
the bore of the gun barrel, allowing two or three
thousandth-s of an inch for working clearance.
This may permit the ?rst three breaches to shift
slightly so that they may not follow each other
perfectly, and may cause re?ections or even
slight steps in the grooves which are successively
tube having a shoulder and locking means mov
ably mounted on the frame and adjustable to
exert pressure on the shoulder and effect sealing
engagement of the open end of the tube with said
bore, said tube being dimensioned to accommo
date the breach in its initial position preparatory
to the breaching stroke.
3. In a breaching machine, a horizontally elon
gated frame, a pull head mounted for horizontal
reciprocation thereon, a breach connected to the
pull head, work supporting means for a work
piece having a here to be breached, a tube for
coolant closed at one end and open at the other
end supported in alignment with said bore, said
tube having an external shoulder, a locking mem
ber on the frame slidable transversely of the tube
into and out of engagement with said shoulder,
guiding means for said locking member on which
it is also swingable toward and from the shoulder,
and a cam operable to swing the ‘locking member
against the shoulder to effect a sealing connec
tion between the open end of the tube and said
bore of the work piece, said tube being dimen
sioned to accommodate the breach in its initial
position preparatory to the breaching stroke.
4. In a breaching machine, a horizontally elon
widened by these three breaches. These imper
fections are corrected by the larger ?nal teeth
gated frame, a pull head mounted for horizontal
reciprocation thereon, a breach connected to the
pull head, work supporting means for a work
of breach D, or the ?nal breach of whatever
number compose the complete series for a given
job. This ?nal broach also differs from the others
in that its body diameter between successive
teeth is made substantially smaller toward the
?nishing end than at the leading end.
8
reciprocation thereon, a breach connected to the
pull head, work supporting means for a work
piece having a bore to be breached, a tube for
coolant, closed at one end, alignable with the
bore of the work piece and provided with means
at its other end to form a disengageable sealed
In a
connection with said bore, said tube being dimen
sioned to enclose the breach when the latter is
positioned at the beginning of its working stroke,
and supporting means for said tube comprising
a single rail mounted on the frame parallel to
the axis of said bore of the work piece and ex
breach having about thirty teeth, the body di
ameter between the last ?fteen to eighteen teeth
is thus made several thousandths of an inch
smaller than the preceding portions of the body
and, to the same extent, smaller than the body
portions of the preceding breaches; the ?nal
chips removed by the last teeth of this breach .
are so thin that this extra clearance space is
1.1
provided for them to insure that they shall not
become wedged or jammed in such positions as
to scratch the bore of the gun barrel, and, as
will be evident, this added clarance also permits .
a freer flow of oil or coolant, which contributes
further toward keeping the chips from causing
damage to the ?nished surface. Fig. 19 may be
tending therefrom in the same direction as said
tube, together with carrying brackets embracing
said rail and extending therefrom to the tube
adapted to ride along the rail or to swing thereon
about the axis thereof to carry the tube longi
tudinally away from the here or shift it trans
versely out of alignment therewith, to facilitate
placing the breach in working position.
5. In a breaching machine, a horizontally elon
gated frame, a pull head mounted for horizontal
considered as a fragmentary section through the
axis of the breach D, showing a body portion of 5.; reciprocation thereon, a breach connected to the
larger diameter at D1 and an adjacent body por
tion D2 of the smaller diameter.
~
I claim as my invention:
1. In a breaching machine, a horizontally elon
gated frame, a pull head mounted for horizontal
reciprocation thereon, a breach connected to the
pull head, work supporting means for a work
piece having a bore to be breached, a tube for
coolant, closed at one end, alignable with the
bore of the vwork piece and provided with means
at its other end to form a disengageable sealed
connection with said bore, said tube being dimen
sioned to enclose the breach when the latter is
positioned at the beginning of its working stroke,
and supporting means for said tube on which said "
tube is movable out of connection with said here
into a position exposing the open end of the tube
for entry of the breach therein.
2. In a breaching machine, a horizontally ‘elon
gated frame, a pull head mounted for horizontal
pull head, work supporting means'for a work
piece having a bore to be breached, a tube for
- coolant, closed at one end, alignable with the
bore of the work piece and provided with means
at its other end to form a disengageable sealed
connection with said bore, said tube being di
mensioned to enclose the breach when the latter
is positioned at the beginning of its working
stroke, and supporting means for said tube on
which the tube is movable transversely upon dis
connection from said bore of the work piece to
. expose the open end of the tube for entry of the
breach therein, said breach having a detachable
shank initially disposable in the bore of the work
piece and connectible with the breach upon re
alignment of the tube with said bore.
6. In a breaching machine, a horizontally elon
gated frame, a pull head mounted for horizontal
reciprocation thereon, a breach connected to the
pull head, work supporting means for a work
2,408,521
9
piece having a bore to be broached, a tube for
coolant, closed at one end, alignable with the
bore of the work piece and provided with means
at its other end to form a disengageable sealed
connection with said bore, said tube being dimen
sioned to enclose the breach when the latter is
positioned at the beginning of its working stroke,
10
11. In a breaching machine, a horizontally ex
tending frame, a crosshead mounted for recipro
cation along the frame, a pull head carried» by
the crosshead, supporting means on the frame
for a work piece having a bore to be breached,
a breach secured in the pull head to be drawn
through said bore, a slide extending from the
crosshead, the frame having ways for said slide
and crosshead, an hydraulic cylinder mounted
and supporting means for said tube including a
track along which the tube is retractable away
from the end of the work piece by a distance ap 10 under the work support and crosshead with a
proximating the length of the breach, said broach
ram projectible from said cylinder below the
having an elongated shank which is initially in
slide,
a terminal on the slide connected to the
serted in the bore of the work piece'withthe
ram for its actuation thereby, a helically grooved
broach proper extending toward the retracted
tube, whereby said tube is then movable upon'its
bar ?xed in the frame extending throughthe
track into telescoping relationwith the breach '
and sealing connection with the bore,
7. In a breaching machine, a horizontally ex
tending frame, a pull head mounted for recipro
cation along the frame, supporting means on the
crosshead and parallel to said ways at one side
of the axis of the pull head, said pull head being
mounted for rotation about its axis and engaging
the breach for rotating it, a follower nut on said
bar journaled for rotation in the crosshead, and
gearing in the crosshead connecting said nut
with the pull head to rotate it as the crosshead
frame for a work piece having a here to be
broached, a rack formed to support a plurality
advances along, the ways.
I
of breaches which are designed to be engaged
12. In a breaching machine which includes a
by the pull head and to operate successively upon
support for a work piece having a bore to‘ be
the bore of the work piece, said rack being mov 25 broached, a breach having a solid body and a
able along the frame in a path substantially par
, series of splined cutting teeth, and means supply
allel with that of the pull head, said rack being
ing coolant under pressure to said here from the
initially disposed adjacent the position at which
.a breach is inserted in the pull head, and means
rear end of the ‘breach, the rear faces of said
cutting teeth against which the coolant is fed
shifting said rack during the working stroke of 30 extending in. planes perpendicular to the axis of
the breach to av position adjacent the position
the'broach.
,
of the pull head at which the breach is to be
_ 13. In a, breaching machine, a horizontally ex
removed from the pull head.
tending frame, a pull head mounted for recipro
8. In a breaching machine, a horizontally ex
cation alOng the frame, supporting means on
tending frame, a pull head mounted for recipro 35 the frame for a workpiece having a bore to be
cation along the frame, supporting means on the
breached, a, rack formed to support a plurality
frame for a work piece having a bore to be
broached, a plurality of broaches each formed for
engagement by the pull head and designed to
operate successively upon the’ bore of thework
piece, anda rack for said breaches mounted for
travel along the frame and coupled to'the pull
head for reciprocation therewith, said rack being
disposed and maintained adjacent the position
occupied by a breach mounted in the pull head.
9. In the combination de?ned in claim 8, said
of breaches which are designed to be engaged
by the pull head and to operate successively upon
the bore of the workpiece, said rack being mount
ed for travel along the frame in a path substan
tially parallel to that of the pull head and being '
- initially disposed adjacent the position at which
a ‘breach is inserted in the pull head, and means
shifting said rack during the working stroke of
the breach to a position adjacent the position of
the pull head at which the breach is to be re
moved therefrom and shifting said rack during
the return stroke to the position at which a differ
plane, and extending in parallel relation to the
ent broach is to be inserted in the pull head.
working position of a breach engaged with the 50
14. A broach having a plurality of splined, heli
pull head.
'
'
cally disposed cutting teeth and including a pilot
10. In a breaching machine, an elongated '
section positioned to enter the work ahead of
frame, a pull head mounted for reciprocation
said’ teeth and having non-cutting, elongated,
along the frame, supporting means on the frame
helical splines of a pitch to follow 'in helical
for a work piece having a bore to be breached,
grooves previously formed in the workpiece.
said pull head being mounted ‘for rotation about
15. A broach having a vplurality of splined,
an axis aligned with the axis of said bore, a
helicallydisposed cutting teeth and including a
breach locked in the pull head for rotation there
pilot section positioned to enter the work ahead
with and formed with splined cutting teeth,
of said teeth and having non-cutting, elongated
means on the frame interengaged with the pull 60 helical splines of a pitch to follow in helical,
rack having supports for holding the breaches,
one above another in a substantially .vertical
head and operableto cause rotation thereof and
of the breach at a predetermined rate as the
pull head travels along the frame, said pull head
width of said non-cutting splines.
drical shell rotatable thereon, the body having
16. A broach having a plurality of splined cut
ting teeth and including a pilot section positioned
an axial bore to receive the shank of the breach, '
said shank having a ?attened area disposable
to enter the work ahead of said teeth and com
, posed of non-cutting, elongated splines positioned
to follow in grooves previously formed in the
in said bore, and a plunger slidably carried in
the body with one end engaging said ?attened
area of the shank and with theother end con
?ned by the shell, said shell having a clearance
recess positioned to register with" the plunger
when the shell is rotatively adjusted on the body,
permitting outward movement of the plunger to
‘
cutting teeth being of progressively increasing
depth and of uniform width greater than the
including a cylindrical body portion with a cylin
release the breach shank.
_ grooves previously formed in the workpiece, said
work piece, said cutting teeth being of progres
, sively increasing depth and of uniform width
' greater than the width of said non-cutting splines. -
75
FRANCIS J. LAPOINTE.
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