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Патент USA US3091149

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May 28, 1963
w. R. JACKSON
3,091,139
AUTOMATIC BILLET CENTER PUNCHING MACHINE’
Filed April 8, 1960
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May 28, 1963
3,091,139
W. R. JACKSON
AUTOMATIC BILLET CENTER PUNCHING MACHINE
Filed April 8. 1960
/mm
4 Sheets-Sheet 2
0
INVENTOR
William R, ‘Jackson.
8Y7”
ATTORNEY
May 28, 1963
w. R. JACKSON
3,091,139
AUTOMATIC BILLET CENTER PUNCHING MACHINE
Filed April 8, 1960
4 Sheets-Sheet 5
mON\
H
mm
‘Uh
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-@
mn
INVENTOR
3:7. Jackson.
William
8Y7
ATTORNEY
May 28, 1963
i
w. R. JACKSON
3,091,139
AUTOMATIC BILLET CENTER PUNCHING MACHINE
Filed April 8, 1960
4 Sheets-Sheet 4
INVENTOR
7O
William R. Jackson.
817% M
ATTORNEY
United States Patent ()f?ce
3,591,139
Patented May 28, 1963
1
2
3,091,139
billet with a reciprocating punch, thereby making it un
necessary to align the billet by carefully and exactly ad
AUTOMATIC BILLET CENTER PUNCHING
MACHINE
justing the height of a table or cradle structure on which
the billet is supported.
William Roland Jackson, Youngstown, Ohio, assignor to
Still another object of the invention is to provide hy
draulic billet center punching apparatus capable of
achieving a much higher production rate than punching
Filed Apr. 8, 1960, Ser. No. 20,862
machines of the type previously used.
6 Claims. (Cl. 78-9)
In accordance with the invention, hereinafter described,
This invention relates to apparatus for punching cen 10 there is provided a horizontally disposed hydraulic cyl
Fordees Corporation, Leetonia, Ohio, a corporation of
Ohio
tering holes in the ends of hot metal billets, and more
inder having a piston therein. Secured to the piston is
a ram or punch adapted to be reciprocated by the piston
along a straight line horizontal path, and beyond the
particularly to apparatus of the type described for punch
ing holes in the ends of hot steel billets preparatory to
a seamless tube forming operation.
forward end of the piston is a cradle or table structure
In the manufacture of tubular products by the seam 15 adapted to support a billet in general alignment with
less process, it is necessary to initially produce a hole in
the punch. At the end of the cradle structure adjacent
the punch is a self-centering clamping device comprising
the end ‘of a heated metal billet at the center thereof
preparatory to a piercing operation. In the past, this
a pair of opposing jaws between which the billet is se
bore was usually provided by means of a pneumatically
cured during a punching operation. The clamping de
operated punch or the like which Was repeatedly forced 20 vice is such that the aforesaid opposing jaws are actuated
against the end of ‘the billet in a forging operation until
by a single hydraulic cylinder operatively connected to
a hole of the desired depth was formed. It is of vital
the jaws through a pair of rocker arms disposed on either
importance that this hole be located at the exact center
side of the billet and adapted to maintain the opposing
of the billet, and since billets of different diameters were
jaws at equal distances from the center line of the punch
punched on the same machine, a vertically adjustable 25 at all times. With this arrangement, the billet will be
table structure was provided for supporting the billet
automatically and exactly aligned with the punch when
during a punching operation, the arrangement being such
it is clamped between the jaws regardless of the height of
that the table could be raised or lowered to accommodate
the aforesaid cradle structure or any deviation in billet
billets of different diameters whereby the longitudinal
diameter. At the same time, since the billet is clamped
axis of any billet could be aligned with the longitudinal 30 immediately adjacent the punch, the forward thrust of
axis ‘of the punch.
the billet during a punching operation may be absorbed
One di?iculty with machines of the type described
by the aforesaid jaws, and no possibility exists of de
?ection ‘of the billet along its length.
above, however, is that the depth of the centering hole
which can be produced with a pneumatic hammer is
The above ‘and other objects and features of the inven
limited and unsatisfactory for certain piercing operations. 35 tion will become apparent from the following detailed de
scription taken in connection with the accompanying
In addition, it is oftentimes difficult to exactly align the
billet with the punch, with the result that the bore is
drawings which form a part of this speci?cation and in
which:
sometimes misaligned with respect to the longitudinal
axis of the billet. Further, in prior art machines of the
FIGURE 1 is a side view ‘of the ‘overall billet center
type described above, the end of the billet opposite the 40 punching apparatus of the invention;
punch was supported against a stop, and the forward
FIGURE 2 is a sectional view of the apparatus taken
thrust of the billet during a punching operation was ob
along line -II—II of FIGURE 1, illustrating the opera
sorbed by this stop. With this arrangement, it was neces
sary to secure or clamp the entire length of the billet
tion of the cradle structures for supporting a billet during
a punching operation;
between the stop and the punch to prevent it from buck 45 .FIGURE 3 is a detailed cross-sectional view taken
ling under the impact of the punch. This is a rather
along line III—III of FIGURE 1 showing the details of
the self-centering clamping vmechanism of the invention;
and
complicated clamping and holding mechanism. Still an
other disadvantage of such prior art punching machines
FIGURE 4 is a cross-sectional view taken along line
resides in their relatively slow operational cycle which 50 IV-IV of FIGURE 2.
cumbersome arrangement and requires a more or less
Referring to FIGURES 1 and 2, the apparatus of the in
permits not more than about two hundred billets per
hour to be punched. Such a slow operational cycle is,
venti-on is supported on a floor or base structure 10 and
includes a pair of parallel upright I-beams 12 and 14- which
carry a billet supporting and manipulating structure, gen
hammer to vform a hole of the proper depth.
erally indicated at 16. As is best shown in FEGURE 2,
As an overall ‘object, the present invention seeks to
the billet supporting ‘and manipulating structure includes
provide a new and improved billet center punching ma
a plurality of I-beams l8 ‘spaced along the length of the
chine in which the punch is actuated by a hydraulic cyl
beams 12 and 14 and extending therebetween. The I
inder whereby much greater punching pressures can be
beams 18 may be welded or otherwise securely fastened
achieved over a pneumatic hammer arrangement, result 60 to the beams 12 and 14 and carry a plurality of spaced
ing in greater depths ‘of the centering holes as are re
structures 20 and 22 each of which has ‘a vertically ex
quired in certain piercing operations.
'
tending guideway therein. As will be understood, each
Another object of the invention is to provide a hy
beam 18 carries a pair of the structures 20 and 22 to
draulic billet center punching machine in ‘which only
provide a pair of facing guideways within which is dis
65
the end of the billet adjacent the punch is secured by a
posed a vertically reciprocable block 24. The blocks
single clamping device, thereby ‘obviating the necessity
24 on the ‘respective beams 18‘ spaced along the length of
of course, due to the fact that a considerable amount of
time is required to permit the reciprocating pneumatic
for clam-ping devices disposed along the entire length of
55
the assembly are interconnected by means of a channel
member 26 which, in turn, may be raised or lowered by
Another object of the invention resides in the provision 70 means of a plurality of jacks 28. As shown, the jacks 28
of a self-centering clamping device for a billet center
are all driven from a common shaft 30 by means of worm
punching machine which will automatically align the
gears 32. Thus, when the shaft 30 is rotated in one
the billet as in prior art devices.
'
'
3,091,139
4
direction, the channel member 26 and the various blocks
24 will be elevated in the guideways in members 20 and
22; whereas, rotation of the shaft 30 in the vopposite di
rection will lowerlthe blocks 24. Extending through the
various blocks 24 is a shaft 34 having a plurality of billet
supporting cradle structures 36 keyed or otherwise se
curely fastened thereto. As will be understood, the shaft
34 may be rotated in a clockwise direction whereby a
billet B supported on the cradle structures 36 will be
transferred to runeout skids 38 where it will roll onto a
conveyor or the like, not shown, which conveys the billet
to a remote point. An unpunched billet is disposed on
skids 40 and comes to rest against stop members 42.
The stop members 42 are spaced along the length of the
billet-supporting and conveying structure and are car
bellows 8'1 and 83 (FIGURE 4) encircle the columns
as shown to prevented dust and the like from depositing on
their surfaces. Carried on the columns extending be
tween the plates 52 and 54 is a third plate 84 which may
be reciprocated on the columns by means of hydraulic
cylinders 86 and 88 carried on the plate 54.
As best shown in FIGURE 4, the four corners of the
plate 84 have bores 90 therein, with each of the bores be
ing provided with a bushing 92 which slides on the sur
face of one of the columns extending between plates 52
and 54. Also carried on the plate 54 is a horizontally
disposed hydraulic cylinder 94 having a piston, not shown,
reciprocable therein. Connected to the piston of cylinder
94 is a piston rod 96 which carries, at one end, a pointed
15 punch 98 adapted to be forced into the end of a billet
positioned on the cradle structure 36. In a punching
ried on rotatable shaft 44, the arrangement being such
that when the stop members 42 ‘are in the position shown,
operation, an end of the billet will be held between the
the entering billet will be prevented from rolling onto the
opposing jaw-s 100 and 102 of the clamping mechanism‘
48. After the billet is clamped between the jaws 100
cradle structures 36. When, however, the shaft 44 is
rotated in a clockwise direction, the waiting billet will be 20 and 102, the cylinder 94 will be pressurized to move pis
permitted to roll onto the cradle structures 36. After
ton rod 96 and the punch 98 to the left as shown in FIG!
URE 4 whereby the punch will pass through opening or
one billet has been transferred to the cradle structures
aperture 104 in plate 52 and into the end of the billet
36, the shaft 44 will be rotated in a counter-clockwise di
rection whereby the next successive billet will come to
held between the jaws i100 ‘and 1.02. Surrounding piston
rest against surfaces 45 on the stop members ‘42 prepara 25 rod 96 and the punch 98 is a tubular member 106 which
tory to its being transferred onto the cradle structures
is carried on the plate ‘84, the arrangement being such
that the member 106 may be moved independently of the
36.
punch 98 by press-urizing the cylinders 86 and 88. After
The billets on cradle structures 36 must be generally
a billet between jaws 100 and 102 is punched, the jaws
aligned with .a reciprocable punch, hereinafter described;
and, since the diameters or cross-sectional con?gurations 30 100 and 102 will be released. Thereafter, the cylinders
86 and 88 will be pressurized to move the plate 84 and
of the billets may vary, the height of the cradle struc
tubular member 106 to the left as shown in FIGURE 4. .
tures 36 may be, adjusted by the jacks 28 to substantially
In this process, the member 106 will engage the forward
align the billet with the center line of the punch. As will
end of the punched billet and will force it outof the‘
hereinafter become apparent, however, the positioning
‘of the billet B on the cradle structures 36 is not critical 35 space between the jaws 100 and 102 where it may be
ejected from the cradle structures 36 as was explained
since the billet will be automatically centered or aligned
in connection with FIGURE 2. As shown, the punch
with the punch by a clamping mechanism, ‘generally in
dicated at 48.
Disposed in a recess in the ?oor or base 10 at one end
of the billet supporting and conveying structure 16 is a
pedestal '50 (FIGURE 1) fabricated from angle irons or
the like which supports a pair of parallel upright plates
98 is carried within a bore \108 provided in an end of
the piston rod 96 and is held therein by means of a pin
110. Independent movement of the piston rod 96 with
respect to the tubular member 106 is provided by virtue’
of the fact that the enlarged diameter portion 112 of the
piston rod may move forwardly in chamber 114 provided
in the tubular member 106 before striking the shoul
52 and 54. Supported ‘on the upper surfaces of plates
52 and 54, and a column 56 at the left end of the ap
paratus, is an elongated I-beam 60 which forms a guide 45 der 116'.
Referring to FIGURES 3 and 4, it will be seen that
way or track for a billet pushing carriage, generally in
the clam-ping jaws 1100 and 102 are carried in' vertically
disposed guideways 118 and 120 which are welded or
otherwise securely fastened to the left-hand side of plate
which are interconnected above and below the track or I
beam60 by blocks to provide an opening through which 50 52 as viewed in FIGURES 1 and 4. The guideways 118
dicated at 62. As shown, the billet pushing carriage 62
is formed from a pair of vertically extending plates 66
the track may pass. Carried on the plates 66 are rollers
68 adapted to travel along the lower ?anges of the I-beams
60 whereby the carriage 62 may be reciprocated back
and forth along the track. Depending downwardly from
and 120 are maintained in a rigid position by means of
gussets 122 which are welded to the plate 52 and guideway
118 or 120, respectively. As shown, each of the oppos
ing jaws 100 and 102 ‘is provided with slots or guideways
the plates 66 is an arm 70 having a member 72 at its lower 55 124 and 126, respectively, which are adapted to receive
extremity adapted to engage the end of a billet disposed
‘on the cradle structures 36 and force it to the right as
inserts 128- and 130 having circular surfaces 132 and 134
thereon adapted to' accommodate billets of different di
ameters, it being understood that the inserts '128 and 130 ,
shown in FIGURE 1. To actuate the carriage 62 and
may be changed for each billet diameter or cross-sectional
arm 70, there is provided an elongated hydraulic cylin
der 74 having its piston rod 76 connected to the carriage 60 con?guration. As shown in FIGURE 3, the inserts 128
and 130 are held in place by mean-s of plates 136 and
64, substantially as shown. With this arrangement, the
138 which vare secured to the opposing jaws 100 and 102
cylinder 74 may be pressurized to move the carriage 62
by means of bolts 140 or other similar fastening means.
to the right and thereby force the billet on cradle struc
The ends of jaws 100 and 102 opposite the inserts 128
tures 36 to the right. At the completion ‘of a pushing
operation, then, the carriage 62 may be returned to its 65 and 130 are provided with rectangularly shaped recesses
142 and 144 which receive bronze plates 146 and 148.
initial position at the left-hand end of the assembly by
pressurizing the opposite side of cylinder 74.
The vbronze plates 146 and 148‘ provide bearing surfaces
between the jaws 100 and 102 and bearing blocks 150
Extending between the four ‘corners of plates 52 and
and 152. The blocks 1% and 152, in turn, have curved
54 at the right-hand end ‘of the assembly as shown in
FIGURE 1, are four columns having their opposite ends 70 bearing surfaces 156 and 158 for the reception of a pair
of pins or axles 160 and 162. As is best shown in FIG
threaded to receive tightening nuts 78 thereon. As will
URE 4, the pins '160 and 162 have their opposite ends
be understood, only two of the columns 80 and 82 are
supported in bearing blocks 164 and 166. The bearing
shown in FIGURES 1 and 4, it being understood that
blocks 166 ‘are carried within apertures in extensions 2168
the other two columns are directly behind the columns
80 and 82 on the other side of the assembly. Flexible 75 and 170 on the jaws 100 and 10.2. The bearing blocks
3,091,139“
6 .
164, on the other hand, are carried in apertures provided
in plates 172 and 174 which are bolted to the outside
surfaces of jaws 100 and 102 as by means of bolts 176
or other suitable fastening means. The pins .160 and
162 are held on the bearing surfaces 156 and 158 in bear
ing blocks 150 and 152 by a ?rst pair of opposing ends
178 and 180 of clamp arms 182 and 184, best shown in
FIGURE 3.
With reference to FIGURE 3, it will be noted that a
pair of pivot pins 186 and 188 extend outwardly from the
upright plate 52 with their axes being parallel to each
other. The extremities of the pins 186 and 188 are
interconnected by means of an elongated plate 187. Pivot
pressurized to force wedge-shaped member 214 to the
right as shown in FIGURE 3, thereby forcing apart op
posing ends 190 and 192 while forcing clamping jaws
100 and 102 together to secure the billet disposed there
between. This action will continue until the pressure
supplied to cylinder 216 reaches a predetermined value,
at which point a pressure switch, not shown, will be
actuated to shut off the supply of ?uid pressure to cylinder
216 and thereby stop movement of wedge-shaped mem
10 ber 214 to the right as shown in FIGURE 3. With this
arrangement, a predetermined pressure can be maintained
on the jaws 100 and 102, and this pressure will be just
sufficient to hold the billet between the jaws during a
ally connected to the pivot pins 186 and 188 intermediate
punching operation without crushing the same.
their ends are the clamp arms 182 and 184, the arrange 15
At the same time that movement of double wedge
ment being such that when the opposing ends 178 and 180
shaped member 214 is stopped, the cylinder 94 will be
of the clamp arms move together the other pair of oppos
pressurized to move piston rod 96 and ram 98 to the left
ing ends ‘190 and 192 will move apart and vice versa.
as shown in FIGURE 4. In this process, the ram 98
As best shown in FIGURE 1, pins 194 and 196 extend
will be forced into the center of the billet to form a hole
through the opposing ends 190 and 192 and are inter 20 therein. After the ram 98 has moved into the billet by
connected by a pair of coil springs 198 and 200 which
a predetermined amount, another limit switch, not
tend to pull the ends 190 and 192 together.
shown, will be actuated by a projection on rod 222 car
Referring again to FIGURE 3, the ends 190 and 192
ried on piston rod 96 (see FIGURE 4). Actuation of
of clamp arms 182 and 184 are provided with a pair of
this latter-mentioned limit switch will then cause pres
pivot pins 202 and 204 which carry a pair of bearing 25 surization of the cylinder ‘94 in the opposite direction to
blocks 206 and 208. These bearing blocks, in turn, ride
retract the piston rod 96 and punch 98. At the same
on the opposing inclined surfaces 210 and 212 of a
time, the cylinder 216 will be pressurized to move wedge-'
double wedge-shaped member 214. The double wedge‘
shaped member 214 to the left as shown in FIGURE 3
shaped member 214 is carried at the end of the piston
whereby the springs 198 and 200 will separate the clamp
rod of a hydraulic cylinder and piston arrangement 216 30 ing jaws 100 and 102 to release the billet held there
which is disposed midway between the axes of pivot pins
between.
186 and 188. It will be noted that the inclined surfaces
After the ram 98 has been retracted by the cylinder 94,
210 and 212 are disposed at equal angles with respect
still another limit switch, not shown, will be actuated by
to the longitudinal axis of the hydraulic cylinder 216
a projection on the rod 222 to pressurize cylinders 86
which, as was mentioned above, is midway between the 35 and 88 and move plate 84 to the left as shown in FIG
pivot pins 186 and 188. With this arrangement, the bear
URE 4.
ing blocks 206 and 208 as well as the ends 190 and 192
move through aperture 104 in plate 52 and into the space
will always be at equal distances from the center line
or longitudinal axis ‘of the hydraulic cylinder 216, and
This Will cause the tubular member 106 to .
between jaws 100 and 102, thereby pushing the punched
billet out of the space between the jaws. Thereafter, the
since this center line intersects the center line of the punch 40 cradles 36 will be rotated in a clockwise direction as
98, the ends 190 and 192, as well as the ends 178 and
shown in FIGURE 2 to place the punched billet on the ‘
180, will also be at equal distances from the center line
run-out skids 38 where it may roll onto a conveyor, not
of punch>98. Similarly, the jaws 100 and 102, as well
shown. Finally,‘ the cradle structures 36 will be rotated
as the inserts 128 and 130, will likewise be at equal dis
in a counter-clockwise direction into the positions shown
tances from the center line of the punch at all times. 45 in FIGURE 2 where the next successive billet may be
Consequently, whenever a billet is disposed between the
rolled onto the cradle structures by actuation of the stop
jaws 100 and 102, and the wedge-shaped member 214
members 42, and the cycle is repeated.
‘
forced to the right as shown in FIGURE 3, the ends 190
Although the invention has been shown in connection
and 192 will move apart while the'jaws 108 and 102
with a certain speci?c embodiment,it will be readily ap~
will move together to clamp the billet in a position where 50 parent to those skilled in the art that various changes in
its longitudinal axis is exactly aligned with the longi
tudinal axis of the punch 98. Thus, when the punch 98 is
moved forwardly into the end of the billet by cylinder
94, it will produce a hole in the end of the billet at its
form and arrangement of parts may be made to suit
requirements without departing from the spirit and scope
of the invention.
a
I_ claim as my invention:
exact center. When the wedge-shaped member 214 is 55 _ 1. In a billet center punching machine, a horizontally I
retracted ‘to the left as shown in FIGURE 3, the springs
disposed cylinder having a piston reciproeable therein, an 198 and @200 will pull ends "190 and 192 together, there
elongated piercing ram having one end connected to said
by separating the jaws 100 and 102. A stop member 220
piston and adaptedto be reciprocated by the piston along
extends outwardly from plate 52 and is adapted to limit
a straight line horizontal path, a cradle structure adapted
movement of the wedge-shaped member 214 to the right 60 to support a billet in alignment with said piercing ram
as shown in FIGURE 3.
whereby the end of the ram opposite said piston may be
In the operation of the device, billets on skids 40 will
forced into an end of said billet at the center thereof, a
be conveyed‘ one by one over the stop member and onto
single pair‘ of opposing jaws at one end of the cradle
cradle structures 36. When a billet is positioned on the
structure for clamping only the end of said billet adja
cradle structures 36, it will actuate a limit switch, not 65 cent said piercing ram, means for conveying a billet onto v
shown, which will, in turn, actuate the hydraulic cyl
inder 74 to move carriage 62 to the right as shown in
said cradle structure at a point removed from the) clamp
ing jaws, means for pushing a billet along the cradle
FIGURE 1. This will force the end of the billet adja~
structure whereby said end of the billet adjacent the pierc
cent the clamping device 48 into the space between jaws
ing ram will be moved between said pair of opposing
100 and 102. After the carriage 64 has moved to the 70 jaws, means for actuating said opposing jaws whereby
right in an amount su?icient to insert the end of the
they will always be at equal distances from the longi
billet into the space between jaws 100 and 102, a second
tudinal axis of said piercing ram, and a tubular member
limit switch will be actuated which will cause the carriage
surrounding said piercing ram and adapted to be moved
64 to be retracted to the left as shown in FIGURE 1.
into the space ‘between said opposing jaws at the comple
At the same time, the hydraulic cylinder 216 will be 75 tion of a piercing operation whereby said end of the
3,091,139
8
billet adjacent the piercing ram will be moved out of the
other of said upright plate members, an elongated pierc
space between said opposing jaws.
infg ram having one end .connected to. said piston and
ried on said base member, horizontally‘exten'ding columns
interconnecting said ?rst and second plate members, a
third upright plate member reciprocable ‘on said columns
adapted to be reciprocated by the piston along a straight
line horizontal path whereby its other end may be moved
through the centrally disposed opening in said other up
right plate member, a cradle structure disposed on the
side of said other upright plate member opposite said
for horizontal movement between said ?rst and second
piercing ram and adapted to support 1a billet in alignment ,
2. ‘In a billet center'pun'ching machine, a base mem
ber, ?rst and second upright parallel plate members car
plate members, a horizontally disposed cylinder carried
with said piercing ram whereby the end of the ram oppo
on the ?rst plate member, said cylinder having a piston 10 site said piston may be forced into an end of said billet
reciprocable therein, an aperture in said second plate
at the center thereof, a single pair of opposing jaws car
member, an elongated piercing ram having one end con- .
nected to said piston and another end adapted to pass
through the aperture in said second plate >member, a
ried on said other upright member at one end of the
cradle structure for clamping only the end of said billet
adjacent said piercing ram, means for pushing a billet
cradle structure carried on the base member at the side 15 'along the cradle structure whereby said end of the billet
of the second plate member opposite said ?rst plate mem
adjacent the piercing ram will be moved between‘ said
pair of opposing jaws, means carried on said other upber, said cradle structure being adapted to supporta billet
in alignment with said piercing ram whereby the end of
the ram adapted to pass through said aperture may be
‘forced into an end of the billet adjacent the piercing ram,
a single pair of opposing jaws carried by said second plate.
member at one end of the cradle structure for clamping
only the end of the billet adjacent said piercing ram,
means for conveying a billet onto said cradle structure
right member for actuating said opposing jaws whereby
they will always be at equal distances from the longitu
;dinal axis of said piercing ram, and a tubular member
surrounding said piercing ram and adapted to be moved
into the space between said opposing jaws at the com
pletion of a piercing operation whereby said end of the
billet adjacent the piercing ram [will be moved out of the
whereby its end adjacent the piercing ram will not extend 25 ;:space between said opposing jaws.
into the space between said clamping jaws, means for
6. In a billet center punching machine, a horizontally
pushing a billet on‘ the cradle structure toward said sec
disposed hydraulic cylinder having a piston reciprocable
ond plate member whereby one end of the billet will
therein, an elongated piercing ram having one end con‘
neoted to said piston and ‘adapted to be reciprocated by
ating said opposing jaws whereby they will clamp 'the '30 the piston along a straight line horizontal path, means
extend into the space between said jaws, means for actu
end of a billet disposed therebetween, and a tubular mem
ber encircling said piercing ram and carried by said
third plate member whereby the third plate member may
be moved along said columns to force the tubular mem-»
her through the aperture in said second plate member
and into the space between said jaws at the completion
for supporting said ram at a ?xed vertical position, a
cradle structure adapted to support a billet in alignment
with said piercing ram whereby the end of the ram oppo
site said piston may be forced into an end of said billet
7 “at the center thereof, a single pair of opposing jaws Iver
tically movable toward and away from each other at one
of a piercing operation to force the end of the billet held '
end of the cradle structure for clamping only the end of
between the jaws out of the space between said jaws.
3. In a billet center punching machine, a horizontally
said billet adjacent said piercing ram, means for actuat~
disposed hydraulic cylinder having a piston reciprocable
ing said opposing jaws whereby they will always be at
equal distances from the longitudinal axis of said piercing
therein, an elongated piercing ram having one end con
ram, means for pushing .a billet along the cradle struc
nected to said piston and adapted to be reciprocated by
the piston along a straight line horizontal path, a cradle
structure adapted to support a billet in [alignment with
ture whereby said end of the billet adjacent the piercing
ram will be moved between said pair of opposing jaws
when they are separated, and a tubular member surround
‘ing said piercing ram and adapted to be moved into the
space between said opposing jaws at the completion of
a piercing operation whereby said end of the billet adja
cent the piercing ram will be moved out of the space
between said opposing jaws.
References Cited in the ?le of this patent
said piercing ram whereby the end of the ram opposite
said ‘piston may be forced into, an end of said billet at the
center thereof, a single pair of opposing jaws at one end
of the cradle structure for clamping only the end of said
billet adjacent said piercing ram, means for actuating
said opposing jaws whereby they will always be at equal
distances from the longitudinal axis of said piercing ram,
UNITED STATES PATENTS
and a member coaxial with said piercing ram and adapted
to be moved into the space between said opposing jaws
1,707,006
at the completion of a piercing operation whereby said
2,011,877
Shatf __,___--,___,..,_.._.___ Aug,.,»20, 1935
end of the billet adjacent the piercing ram will be moved
2,341,602
Dewey _____ _,_-__,_
,, ‘Feb. 15,1944
out of the space between the opposing jaws.
2,694,359
Jacobson ___,____.,_,_
,__ Nov. 16, 1954
,
4. The combination claimed in claim 3 wherein the
Hanna __________ _,______ Mar. 26, 1929
2,731,859
Kendall , ____ _,_..__,._-__H__ Jan. 24, 1956 .
2,766,631
Van Settert ____ ___...__..__ Oct. 16, 1956
tudinal axes of billets of various cross-sectional areas with 60.1 2,936,811
Skawden .._..,_______..____ May 17, 19160
cradle structure is adjustable in height to align the longi
the longitudinal axis of said piercing ram.
I
5. In a billet center punching machine, a base .mem
bet, a pair of parallel upright plate members secured to
the base member, a horizontally disposed cylinder car
ried on one of said plate members and having a piston 65
reciprocable therein, a centrally disposed opening in the
I
FOREIGN PATENTS
178,068‘
Great Britain ________ _____ Jan. 4, 1923 _
357,659
845,316
Great Britain _______ _,____ Oct. 1, 1931
Great Britain _________ __ Aug. 17, 1960
1,112,486
Germany ___________ __,_ Aug. 10, 1961
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