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Патент USA US3062093

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Nov. 6, 1962
Y
J. J. STRNAD
3,062,083
INTERCHANGEABLE DIE SETS
Filed May 20, 1958
4 Sheets-Sheet 1
INVEN TOR.
JAMES J. STRNAD
BYCORBETT, MAHONEY, MILLER
& RAMBO. ATT ' .
Nov. 6, 1962
J. J. STRNAD
3,062,033
INTERCHANGEABLE DIE SETS
Filed May 20, 1958
4 Sheets-Sheet 2
IN VEN TOR.
JAMES J. STRNAD
W 20
BY
'
Nov. 6, 1962
.1. J. STRNAD
3,062,083
INTERCHANGEABLE DIE SETS
Filed May 20, 1958
4 Sheets-Sheet 3
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INVEN TOR.
'
JAMES J. STRNAD
3,062,083
tats
Patented Nov. 6, 1962
2
1
3,062,083
James J. Strnad, Bedford, ()hio, assignor to Lempco
INTERCHANGEABLE DIE SETS
Products, Inc., Redford, Ohio, a corparation of Ohio
Filed May 20, 1958, Ser. No. ‘736,579
6 Claims. (Cl. 83—637)
punch and/or die members which embody knife edge
type steel strips or segments mounted in and projecting
outwardly from an associated, relatively lightweight
punch or die-supporting block formed from plywood or
the like, and which are employed in the high speed punch
ing or stamping of sheet metal workpieces.
A further object of the present invention is to provide
a die set of the aforesaid character which comprises a
The present invention relates generally to die sets for
machine presses, and more particularly to new and im
proved die sets which are standardized, so as to inter
pair of relatively reciprocal shoe members adapted for
mounting upon the relatively movable bed and platen
changeably receive and detachably mount a given set of
members of a machine press, and united for extremely
accurate reciprocating movement toward and from one
punch and die members without necessitating expensive,
time-consuming and laborious prealignment and attach
another by means of suitable guide pin and bushing mem
bers, and wherein each of the relatively reciprocal shoe
ment procedures heretofore necessary in the mounting of
a set of punch and die members upon prior art die sets. 15 sections of the die set is provided with locating and at
taching means disposed in predetermined ?xed relation to
The use of die sets in machine presses for the purpose
of maintaining precise and exacting alignment between
co-operating punch and die members during stamping or
punching operations is now practically universally ac
the axes of the pin and bushing members, so as to detach
ably receive and mount upon the respective shoe sections
of a die set a cooperative pair of punch and die-support
cepted practice. However, in the use of prior art die sets
comprising a pair of relatively reciprocal plate-like shoes
united for relative reciprocation by means of a plurality
ing blocks or plates in a manner to assure proper and
accurate closing alignment between the punch and die
cooperative die and punch members are ordinarily per
members, thus enabling a single set of punch and die
members and their associated relatively lightweight
mounting blocks or plates to be interchanged readily be
manently and securely mounted and ?xed, in prealigned
relation, to the relatively heavy plate-like shoe members
tween duplicative die sets.
Yet another object of this invention is to provide a die
oftentimes reduces the overall productive capacity of
such operations.
or member provided ‘with accurately machined, relatively
angularly related ?at surfaces adapted for abutting en
of relatively telescoping pin and bushing members, the
set for machine presses comprising relatively reciprocal,
of the die set, and when once mounted upon the shoes
heavy duty shoe sections connected by relatively telescop
of the die set, thereafter form substantially an integral,
ing pin and bushing means, and wherein one of said shoe
nondetachable part thereof. In view of the relative size
and weight of the shoe members of a die set, consider 30 sections is provided with locating or indexing abutment
surfaces disposed in predetermined or given spaced, angu
able di?iculty and expense is encountered in the storage
lar relation to the axes of the pin and bushing means, and
and handling of the punch and die members and their
operable in association with relatively movable clamp
associated die set shoes, and in the transportation of the
means carried by such shoe section to receive and detach
die set and attached punch and die members from one
ably mount thereon a punch or die-supporting plate or
operating location to another. Hence, for an operator
block formed from plywood or the like, in a manner to
having business establishments in different cities, it has
maintain the punch or die-supporting member in prede
become economically infeasible to ship or transport a
terrn-ined accurate operating alignment with an associated
given set of punch and die members and their attached
punch or die member detachably mounted upon the other
die set shoes between several di?erent locations. This,
shoe section in predetermined spaced, angular relation to
in many cases, has necessitated the duplication of a given
the axes of the pin and bushing means.
.
_ >' ~_'
set of punch and die members and their associated die
Still vanother object of the invention is to provide‘ a die
set shoes, in order that each of several di?erent operating
set comprising relatively reciprocal shoe sections con
locations might be equipped to produce a given stamping
nected for reciprocating movement by means of relatively
or other workpiece. Naturally, this duplication of punch
telescoping pin and bushing means, and wherein one "of
and die members and the associated die set shoes repre
the shoe sections includes a punch or die-supporting plate
sents a considerable expense to the press operators, and
Accordingly, it is the primary object of the present
invention to provide a new and improved die set which is
capable of detachably receiving and mounting a given set
of punch and die members in exact operating relation
without resort to the expensive, time-consuming, and
laborious prealignment and mounting procedures hereto
fore employed in permanently mounting and securing a
set of punch and die members upon the shoes of a die
gagement in at least three triangularly related lines-or
points of contact with the outer concentric surfaces of the
bushings of the pin and bushing means, so as to accurate
ly and precisely locate such punch or die-supporting plate
or member in a single given position with respect to the
axes of the pin and bushing means.
For a further and more detailed understanding of the
present invention and the additional objects and-advan
tages thereof, reference is made to the following descrip
tion and the accompanying drawings, wherein:
set, thus making possible the interchange of a given set
of punch and die members between duplicative die sets
FIG. 1 is a perspective view of a die set formed in ac
located, for example, in different cities. In this connec 60
cordance with the present invention showing the upper
tion,'it will be understood that the present die sets are
and lower shoe sections in assembled operating relation
so formed and constructed as to permit the simple and
to one another;
facile detachable mounting of a given set of punch and
FIG. 2 is a perspective view showing the upper'shoe
die members upon the relatively reciprocal shoe members
of the ‘die set in accurately aligned operating relation to 65 section of the die set in inverted position as compared with
one another, while at the same time permitting the set
FIG. 1;
'
of punch and die members to be easily removed and
detached from the relatively heavy and large shoe mem
bers of the die set for storage and transportation between
FIG. 3 is a perspective view of the lower shoe section
of the die set and its associated punch or die block mount
a die set which is particularly adapted and constructed for
details of the upper shoe section of the die set;
FIG. 5 is a detailed fragmentary vertical sectional view
ed thereon;
FIG. 4 is ‘a transverse vertical sectional view taken
different operating locales.
70 along the line 4—4 of FIG. 1 and showing the sectional
Another object of the present invention is to provide
the detachable mounting of so-called “steel rule-type”
3,062,083
3
4
taken along the line 5—5 of FIG. 1 and illustrating the
relative location and relationship between the upper shoe
section, its guide pin, ‘the locating key or abutment mem
ber and the die or punch-supporting block member;
and when so used, the blocks 23 serve to elevate the
lower shoe 20 with respect to the associated bolster or
bed of the press so as to provide accessible clearance
FIG. 6 is a similar view taken along the line 6—6 of
space therebetween, and when desired, permit the guide
tional depending upon the particular installation involved,
FIG. 1 and showing the mounted relationship between
bushings 13 to extend below the lower surface of the shoe
the punch or die-supporting plate, a primary adapter plate,
20 in controlling the shut height of the die set.
a riser block, and the associated lower shoe;
FIG. 7 is a plan view of the upper shoe section of a
The parts of the die set previously enumerated, namely,
the upper shoe, lower shoe, and pin and bushing means are
modi?ed form of die set, looking toward the under side 10 common to present die sets, and as such, do not, per se,
thereof;
constitute the novelty of the present invention. In accord
FIG. 8 is a plan view of the lower shoe section of the
modi?ed form of die set shown in FIG. 7;
FIG. 9 is an enlarged detail fragmentary elevational
ance with the present invention, the lower shoe member 20
is adapted to detachably receive and support thereon in a
single given position, a punch or die-supporting means
view of the relatively stationary and movable clamping 15 which, in the form of the present invention as disclosed in
blocks employed in the modi?ed die set shown in FIG. 7;
FIGS. 1—6 of the drawings, constitutes a pair of cooper
FIG. 10 is an enlarged fragmentary vertical sectional
ative rectangular, ?at plates 25 and 26. Advantageously,
view taken along the line 10—10 of FIG. 9 and showing
the lowermost of these plates 25 is comparatively heavier
particularly the return spring arrangement between the
and thicker than the uppermost plate 26 in order to with
relatively stationary and movable clamping blocks em 20 stand and absorb the pressing forces encountered, while
ployed in the die set disclosed in FIG. 7; and
the uppermost plate 26- may be made of relatively thinner
FIG. 11 is a diagrammatic plan view illustrating the
and less expensive metal stock which, if damaged, may be
predetermined spaced and angular relationship between
more readily and inexpensively replaced than the lower
the pin and bushing members and the locating blocks and
plate 25. However, for the purposes of the present in
keys of the upper shoe section of the die set disclosed in 25 vention, it should be understood that the die or punch
FIGS. 1—6.
supporting means may take the‘ form of a single in
Referring now to the drawings, FIG. 1 illustrates in its
tegral plate member rather than a composite of the two
entirety a die set formed in accordance with the present
separate plates 25 and 26- as shown in the drawings.
invention. This die set comprises a relatively thick, rec
Mounted upon the upper plate 26, as by means of weld
tangular, plate-like upper shoe 15 which, in operation, is
ing, bolting, or other appropriate fastening means, not
adapted to be secured to the movable platen or ram
shown, is a rectangular punch or die block 27 (see FIG.
member of a press, not shown, by any suitable means,
3) which may comprise either the male or female mem
such as the upwardly extending, cylindrical stud-like
ber of cooperative punch and die means. Before attach
shank 14. Alternatively, as will be understood, the upper
ing or securing the punch or die block 27 to the plate
shoe 15 may be secured to the movable member of the 35 26, the proper location of the latter relative to the plate
press, simply by bolting the shoe 15 to the movable mem
26 is predetermined by a trial and error closing of the
ber of the press in a conventional manner. The upper
shoe 15 is formed toward its rearward or inner side with
upper and lower shoe sections of a master die set, in
order that the punch or die block 27 is exactly located
on the upper plate 26 relative to a pair of dowel-receiving
pressed ?tted or otherwise suitably stationarily secured 4-0 openings 28 (see FIGS. 3 and 6) formed toward the outer
the upper end portions of a pair of downwardly extending
side edges of the upper plate 26. In this regard, in order
guide pins or posts 17'. In the usual manner, the guide
to insure against an improper location of the upper plate
posts 17 extend a distance downwardly below the lower
26 upon the associated lower plate 25, the dowel-receiv
surface of the upper shoe 15 and are telescopically re
ing openings 28 of the upper plate 26 and a pair of as
ceived within a cooperative pair of cylindrical tubular 45 sociated dowel pins 29, which are press ?tted into the
bushings 18 suitably secured, as by press ?tting, within
lower plate 25, are located at different distances relative
spaced openings 19 formed in a lower, plate-like shoe 20.
to the edges of the plates ‘25' and 26, so that the dowel
Interposed between the outer surface of the pins or posts
receiving openings 28 of the upper plate will register
17 and the inner ‘walls of the bushings 18 are cylindrical
with the dowel pins 29 only when the upper plate 26 oc
a pair of pin or post-receiving openings 16 in which are
tubular bearing retainers 21 which rotatably support there 50
diameter to extend radially inwardly and outwardly from
the retainer 21 to rollingly engage the opposing surfaces
in a multiplicity of antifriction ball elements 22 of a
cupies one given single position upon the plate 25, thus
preventing accidental transposition of the upper plate 26
upon the lower plate 25. This is referred to in the art
as “foolproo?ng” to make certain that in the assembly
of the posts 17 and bushings 18. In the usual manner, the
of the upper and lower plates, personnel will not acci
antifriction ball bearings 22 are of the “pre-loaded” type
dentally reverse the positions of the plates which might
with the diameters of the ball elements thereof very slight
otherwise occur due to the ?ush relation to the rectangu
ly exceeding the annular space provided between the outer
lar edges of the upper and lower plate members.
surface of the posts 17 and the inner wall surfaces of the
As will be understood, the dowel-receiving openings 28
bushings 18. In this manner, the pins and bushings and
and the dowel pins 29 are extremely accurately machined
bearing retainer serve to connect the upper and lower
to provide proper alignment between the upper and lower
shoes 15 and 20 respectively for accurately guided recipro 60 plates and thereby eliminate substantially all tolerance
cating movement, while at the same time eliminating any
between these members. After locating the upper plate
possibility of lateral play or deviation during reciprocat
26 upon the lower plate 25 by means of the dowel pins
ing movement thereof.
29 and openings 28, the upper plate 26 may be secured
The lower shoe 20 of the die set may, if desired, be
to the lower plate 25 through the use of ?ush-type cap
secured directly to the bed of the associated press by
screws or the like 30‘.
means of bolting, or other fastening means, or, if desired,
If desired, the lower plate 25 may be secured directly
may be secured to the bed of the press in relatively ele
to the upper surface of the lower shoe 20 or alternatively,
vated relation thereto through the use of a plurality of
as indicated in the drawings, the lower plate 25 may be
spacer or ?ller blocks 23 which are secured to the base of 70 secured to a plurality of rectangular risers or spacer
the shoe 20, along the outer side edges thereof, as by
blocks 31 which are interposed between the lower surface
means of bolts or cap screws 24 which, if desired, may
of the rlower plate 25 and the upper surface of the lower
also be utilized in securing the =lower shoe 20 to the sta
shoe '20. Preferably, the lower plate 25 is bolted, as at
tionary bed, or bolster of the press. It will here be under
32 (see FIG. 6), to the riser or spacer blocks 31, while,
stood that the use of the spacer or ?ller blocks 23 is op 75 the riser blocks 3-1 may be bolted, in turn, to the lower
3,062,083
5
shoe 20. Advantageously, in order to provide access to
the bolts 32, the upper plate 26 may be formed with open
ings or slots 33 in registry with the bolts 32, so that
the upper plate 26 and lower plate 25- may be detached
as a unit from the riser blocks 31 and lower shoe 20.
In order to accurately locate the die or punch-supporting
means in operative position upon the lower shoe 20‘, the
6
key or abutment block 43 is secured in the keyway 42 and
to the upper shoe 15 by means of cap screws or the like
44. Thus, the locating key or abutment block 43 ex
tends generally transversely beneath the lower surface of
the upper shoe 15, but terminates a slight distance inward
ly from the outer side edges of the shoe so as to provide
as much area of contact as is practicable with an associ
ated die or punch~supporting block, hereinafter described.
lower or base plate 25 may be integrally formed, or other
As will be understood, the locating key or abutment block
wise suitably provided, with a pair of rearwardly ex
tending locating or indexing bosses 34 and 35, as shown 10 43 may be formed as an integral part of the shoe 15, or
may, if desired, be formed as a separate part attached
best in FIG. 3. The locating boss 34 terminates in a
to the shoe, but in either case, the forwardly extending
?at, planar abutment surface 36 disposed generally par
side surface of the locating key 43 is accurately ma
allel to the rearward edge of the plate 25 and adapted to
chined to constitute a ?at planar surface disposed in pre
make diminished area contact with the outer cylindrical
determined angular position with respect to a straight line
surface of one of the bushings 18. The other boss 35 is
joining the axes of the guide pins or posts 17.
formed With a V-shaped notch 37 which de?nes on the
By reference to FIG. 11, the line A—B designates a
boss a pair of spaced, angularly related, ?at abutment
straight line passing through the axes of the pins or posts
surfaces 38 adapted to provide a diminished area of con
17, while the line C—~D designates the plane of the outer
tact with two spaced points on the outer cylindrical sur
face of the other bushing 18. The spacing between the 20 surface of the key or abutment block 43‘. As will be here
inafter more fully explained, in order to accomplish
V-forming surface 38 of the boss 35 is such as to permit
standardization of the die sets to thereby provide inter
the outer cylindrical surface of the bushing 18 to partially
changeability of a given set of punch and die-supporting
enter the V-shaped notch 37 of the boss 35 whereby to
members between different though duplicative die sets, the
prevent relative lateral displacement between the lower
plate 25 and the bushings 18, while the ?at surface 36 25 plane of the outer surface of the key or block 43 must
be disposed at a given uniform distance from the line
of the boss 34, ‘forming the third angularly related point
A—B joining the axes of the posts 17, and in given, uni
of contact with the other bushing 13, serves to locate the
form angular relation thereto. In the form of the present
plate 25 relative to the axes of the bushings 18 in a
invention disclosed herein, the angular relation between
manner to prevent radial shifting or displacement of the
plate 25 in respect to the bushings 18. It should here be 30 the line A—B and the plane of the outer face of the key
43, indicated by the symbol alpha, is zero degrees, but,
understood that the triangularly related ?at abutment sur
as will be understood, these two factors, namely distance,
faces 36 and 38 of the bosses 34- and 35 are employed
and angular relationship, may be varied as between differ
ent sizes or con?gurations of die sets, provided that for
tion relative to the axes of the bushings 18 prior to the 35 each size and con?guration of die set, the distance X
and the angle, alpha, must remain constant, in order to
bolting or securement of the plates 25 and 26 to the
provide for interchangeability. Toward this end, it will be
lower shoe 20. Toward this end, in initia'lly assembling
seen that the outer surface 43a of the locating key or
the plates 25 and 26 upon the lower shoe 20, the plates
as a highly accurate means of locating the die supporting
plates 25 and 26 at a predetermined single given posi
are slid or swung rearwardly toward the bushings 18 so 40 block 43 must be machined or formed with precise ac
curacy so as to provide the desired distance and angular
as to insure ?rm abutting engagement between the ?at
relationship between such outer surface and a line joining
surfaces 36 and 38 of the bosses and the outer surfaces
the axes of the guide pins or posts 17 of the die set.
of the bushings 18. When proper contact between these
surfaces is insured, a leaf spring-type clamp 39‘ carried by
the lower shoe 20, is tightened, by means of a cap screw
40 to apply holding pressure through an inturned lip 41
of the clamp 39 to the outer or forward edge of the
lower plate 25, thus holding the same in tight abutment
with the outer surfaces of the bushings 18. At this time,
the plates 25 and 26 may be anchored securely to the
Also, as a part of the punch or die-locating meansof
the upper shoe section, there is provided a secondlo
eating block or ?ange member 45 which is secured along
the left-hand side edge of the upper shoe 15, as viewed in
FIG. 4 of the drawings, as by means of a plurality of cap
screws 46. By reference to FIG, 4 of the drawings, it
will be seen that the locating ?ange 45- is of a height to
lower shoe 2%} or the riser or spacer blocks 31 as by means 50 extend downwardly a distance below the bottom surface
of the shoe 15, and terminates in a lower beveled edge
of the bolts 32. Thus it will be seen that the bosses 34 and
47. As in the case of the outer face 43a of the key 43,
35 provide a positive and e?icient means for locating or
the inner side or face surface of the locating ?ange 45,
indexing the punch or die-supporting plates 25‘ and 26 on
the lower shoe member of the die set in a single given 55 and the associated side surface of the shoe 15‘ must be
machined to a high degree of accuracy so as to locate
position relative to the axes of the pin and bushing mem—
the inner side surface 45a of the ?ange 45 at a prede
bers which connect the upper and lower shoe sections of
termined exact distance Y (see FIG. 11) from a line E-F
the die set. In this respect, the outer cylindrical surfaces
of the bushings 13 are formed concentric with the axes
extending perpendicularly to the line A-—B, and through
of the pins and bushings to insure that the ?at abutment 60 the axis of one of the pins 17. So, also, the surface 451
of the locating ?ange 45 must always be disposed at a
surfaces 36 and 38 of the bosses of a given set of punch
predetermined angle, theta, with respect to the line A—B
or die-supporting plates will be disposed in the same
joining the axis of the posts 17, in order that all die
spaced and angular relation with respect to the axes of
sets of a given size and con?guration may interchange
the pins and bushings of any number of duplicative die
_ ably receive a given set of punch and die-supporting
sets.
members. In the form of die set disclosed in FIGS. 1
For locating or indexing the cooperative punch or die
through 6, the angle theta is equal to ninety degrees,_ al
supporting means on the upper shoe 15, the latter is
though it will be understood that this angle may be varied
formed a distance inwardly from the pins or posts 17 with
between different sizes and con?gurations of die sets, so
an accurately machined keyway 42, as shown best in FIGS.
2 and 5, which receives and supports a locating key or 70 long as the same is constant with all die sets of a given
size or con?guration. It should also be understood that
abutment 43 of generally rectangular cross section and of
while the drawings depict the locating ?ange 45 as a sepa
a size to extend a distance downwardly below the under
rate part from the shoe 15‘, the same may be formed as an
surface of the upper shoe 15. FIG. 2 of the drawings
integral part of the shoe if desired.
depicts the upper shoe section of the die set in inverted
position, from which it will be noted that the locating 76 By reference to FIGS. 2 and 11, it will be seen that the
3,062,083
0
<3
inner side surfaces 43a and 45a provide an entrant, right
ing key and ?ange43 and 45 in a manner to prevent the
angular corner to receive and accurately locate a rec
full entrance of an unbeveled corner of the block 48 with
in the entrant corner provided by the locating members.
In this manner, only the beveled corner portion 6% of
the punch or die-supporting block 48 may be tightly re
ing the depending knife edge segments 49 forming a gen
ceived within the entrant corner provided between the
erally rectangular die cooperative with the punch block
locating members 43 and 45, thus eliminating the possi
27 mounted upon the lower shoe section of the die set.
bility of personnel reversing the position of the punch
In this regard, it will be understood that the block 48
or die-supporting block 48 when installing the same in
may support either the male or female member of a
given set of punch and die members or a combination 1O association with the upper shoe section.
Thus, it will be seen that through the provision of rela
of male and female members, with the lower plates 25
tively ?xed positions of the locating key 43 and the locat
and 26 supporting the cooperative male or female mem
ing ?ange 45 with respect to the axes of the pin and bush
bers or combination thereof, depending upon the par
ing means, as between numerous different die sets of a
ticular stamping or pressing operation to be performed
thereby.
15 given size and con?guration, a given punch or die-sup
porting block may be interchanged between two or more
As will be seen by reference to FIGS. 4 and 5 of the
drawings, the steel rule or knife edge segments or strips
duplicative die sets, and yet be maintained and secured
tangular punch or die-supporting block 48, preferably
formed from plywood, and which is illustrated as support
49 extend substantially through the associated plywood
in the same given single position on the upper shoe sec
tion of each die set. By the same token, due to the accu
block 48 and terminate at their lower edges in beveled
knife-edge extremities. The opposite or upper edges of 20 rate location of the lower punch or die-supporting plates
25 and 26, afforded by the triangularly disposed ?at sur
the blade segments 4? terminate flush with the upper sur
faces of the bosses 34 and 35 against the outer concentric
face of the supporting plywood block 48 and in abutting
surfaces of the bushings 13, a given lower punch or die—
engagement with a relatively thin, rectangular, metal back
supporting plate structure may be interchanged between
up plate 50. The back-up plate 50 is appropriately se
cured in position upon the upper shoe 15 as by means 25 two or more duplicative die sets and the initial inter?tting
alignment between the male and female die and punch
of ?ush head screws or bolts 51. The back-up plate 50
members will always be maintained without resort to
serves to prevent wear upon the relatively expensive and
heavy upper shoe 15 by absorbing impact forces imparted
individual trial and error alignment procedures upon each
given interchange of a given set of punch and die mem
30 bers between duplicative die sets. This interchangeabil
operations.
ity, so far as the applicant is aware, has heretofore been
For the purpose of maintaining the punch or die-sup
impossible, due to the more or less ?xed and permanent
porting block 48 in tight-?tting accurate engagement with
mounting of a given set of punch and die members on
the locating key and ?ange 43 and 45 respectively, the
the shoe members of a die set.
upper shoe 15 is provided along its forward and right
FIGS. 7 through 10 illustrate a modi?ed form of die
hand Side edges (as viewed in FIG. 1) with a pair of
set vformed in accordance with the present invention and
adjustable clamp plates or bars 52 and 53 respectively.
one which is employed for the support and guidance of
As will be seen by reference to FIG. 4, the side clamp 53
relatively large-area punch and die-supporting members.
is secured to the side edge of the upper shoe 15 by means
Referring to FIG. 7, the numeral 70‘ designates a rela
of adjustable cap screws 54 which may be tightened to
tively large and heavy rectangular upper shoe which is
move the clamp 53 inwardly of the associated edge of the
provided a distance inwardly from each of the four
plywood block 48 so as to ‘force the same into tight ?tting
corners thereof with depending guide posts or pins 71
engagement with the inner surface 45:: of the locating
arranged to telescope within cooperative bushings 72
?ange 45. In order to maintain the inner surface of the
carried upon a lower shoe 73, as shown in FIG. 8. The
clamp 53 in ?at, surface to surface, contact with the
pin and bushing connections between the form of die
associated edge of the plywood block 48, the clamp 53
set disclosed in FIGS. 7-10‘ and that disclosed in FIGS.
is provided with a plurality of screw threaded leveling
1-6 of the drawings are substantially identical in mechan
screws 55 which extend through threaded openings
ical principle, but due to the relative size of the die set
formed in the clamp 53 and into abutting relation with
disclosed in FIGS. 7-10‘, it is necessary to utilize four
the outer side edge of the upper shoe 15. As will be
rather than two pin and bushing guide assemblies be
understood, by adjusting the leveling screws 55 during
tween the upper and lower shoe components, in order to
and following tightening of the cap screws 54, the clamp
‘maintain the desired exact alignment of such components
53 may be maintained in parallel relation to the outer
during relative reciprocation thereof. The upper shoe 70
edge of the plywood block 48 and the outer edge of the
is formed inwardly from one end thereof with a keyway
upper shoe 15. This serves to prevent tilting or cocking
of the clamp 53 and consequent application of non-uni 55 74 in which is received a pair of relatively spaced, longi
tudinally aligned, and accurately located and machined
form pressures to the side edges of the plywood block 48.
abutment keys 75 analogous in function to the single
The forward adjustable clamp 52 is secured to the for
key 43 of the previously described form of the present
ward edge of the shoe 15 in the same manner as is the
invention disclosed in FIGS. 1—6 of the drawings. Along
side edge clamp 53, and is likewise provided with adjust
60 the rearward edge of the upper shoe 70, the latter is
able cap screws 56 and leveling screws 57.
provided With three relatively spaced locating ?anges or
Thus, in mounting the punch or die-supporting block
blocks 76 which are analogous to the locating ?ange 45.
48 in connection with the upper shoe 15, the block 48
As
in the case of the primary form of the invention, the
is positioned initially in abutting relation to the relatively
locating keys 75 and locating ?anges 76 provide an en
?xed locating key 43 and ?ange 45 at which time the
to the blade segments 49 during punching or pressing
adjustable clamps 52 and 53 are tightened inwardly upon 65 trant corner to receive a beveled corner 70a of an asso
ciated die or punch-supporting plywood block 70b. The
the opposite edges of the plywood block 48 to securely
entrant corner provided between the keys 75 and ?anges
clamp the same in a desired single given position upon
76 is provided with a foolproof pin 61a cooperative with
the upper shoe 15. In order to prevent accidental trans
the beveled corner of the plywood block to prevent acci
position of the upper punch or die~supporting block 48, 70 dental transposition of the block on the upper shoe.
due to its otherwise symmetrical con?guration, one of
Disposed in opposing relation to the relatively station
the corners of the block 48 is beveled off as at 60, as
ary locating ?anges 76 and adjustably secured to the
shown in FIG. 2, and a foolproof pin 61, ?rmly carried
opposite or forward edge of the upper shoe 70 are three
by the upper shoe 15, projects downwardly into the en
adjustable clamps 77 which, as in the case of the clamps
trant corner provided by the inner surfaces of the locat~ 75 53, are adjustable inwardly and outwardly with respect
3,062,083
9.‘
to the relatively ?xed flanges 76 so as to clamp the die
or punch-supporting block 70b therebetween.
Disposed in opposing relation to the stationary locating
keys 75 are two sets of movable clamp members gen
10‘
without resort to the usual prealignment and attachment
procedures.
While preferred embodiments of the present invention
have been disclosed and described in detail, it will be
understood that various modi?cations as to details of
erally designated at 78. Each set of the clamp members
construction and design may be resorted to without de
7 8 comprises a stationary bar or block 79 secured within
parting from the spirit of the invention or the scope of
a recess ‘or keyway \80 formed in the under surface of
the following claims.
the shoe 70. The relatively stationary bars 79 are con
Having thus described this invention, What is claimed
nected with the upper shoe 70 by means of appropriate
1s:
fastening devices, such as the cap screws 81. Mounted
1. A die set comprising a pair of plate-like shoes
adjacent the relatively stationary bars 79 are the coopera
adapted for connection with relatively reciprocal mem
tive movable clamp bars 82 which are secured to the
bers of a press; at least two relatively spaced apart, tele
upper shoe 70 for limited sliding movement by means of
scoping pin and bushing guide assemblies connecting said
an elongated slot and pin connection as shown at 83.
Connected between the stationary bars 79 and the mov 15 shoes for guided, relative, reciprocating movement toward
and from one another; punch-supporting means; abut
able clamp bars 82 are a plurality of contractile springs
ment means carried by one of said shoes in ?xed relation
84 arranged to urge the movable clamp bar 82 toward
to said guide assemblies and against which said punch
supporting means may be positioned to locate the latter
movable pins 84a. Opposing the action of the springs 20 in a single given position with respect to said guide as
semblies; releasable clamp means carried by said last
84 are a plurality of threaded cap screws 85 which ex
named shoe ‘for holding said punch-supporting means in
tend through cooperatively threaded openings in the sta
said single given position; die-supporting means; indexing
tionary bar 79 in abutting relation to the outer side edge
means carried by said die-supporting means and includ
of the movable bars 82. Thus, by tightening the adjusting
screws 85, the movable clamp bars 82 are caused to move 25 ing a plurality of relatively spaced, angularly related
abutment surfaces engageable with at least two of said
inwardly against the resilient action of the return springs
guide assemblies for locating said die-supporting means
84, and into clamping engagement with an edge of the
on the other of said shoes in a single given position rela
plywood die or punch-supporting block 70b, in a man
tive to said guide assemblies, the abutment surfaces of
ner to tightly clamp the same in connection with the
the relatively stationary bar 79. The ends of the springs
are connected with the bars 79 and 82 by means of re
relatively stationary locating keys 75.
The lower shoe section of the die set disclosed in
FIGS. 7 through 10 is shown particularly in FIG. 8 of
30 said indexing means including a ?rst surface engaged with
one of the guide assemblies and second and third surfaces
engaged with two relatively spaced, angularly related
surfaces of another of said guide assemblies to prevent
lateral movement of said die-supporting means on said
construction to the lower shoe section of the ?rst form
of die set disclosed in FIGS. 1 through 6 of the draw 35 other shoes; and releasable fastening means for securing
said die-supporting means in said single given position
ings, with the exception that the V and ?at locating
on said other shoe, said die-supporting means and said
bosses 34a and 35a are offset with respect to two corners
indexing means being removable as a unit from said other
of the lower die or punch-supporting plate members 86
shoe upon release of said fastening means Without chang
so as to engage the outer concentric surfaces of the bush
ing the positional arrangement of said guide assemblies
ings 72 at the outer forward side of the die set. Also,
with respect to said shoes, said ?rst-named abutment
in the modi?ed form of the present invention as disclosed
means and said indexing means providing means by which
in FIGS. 7—l0, due to the relatively large size of the
said punch-supporting means and said die-supporting
upper and lower shoe sections of the die set, it is neces
means may be accurately located on said shoes in opera
sary to employ a plurality of the temporary spring clamps
the drawings and is substantially identical in functional
39a located at spaced intervals along the forward edge
of the lower shoe member 73.
It will be apparent that the mode of operation and
mechanical principles involved in the modi?ed form of
die set disclosed in FIGS. 7-10 of the drawings are
identical to that disclosed in FIGS. 1 through 6, in that
the punch or die-carrying plates or blocks associated
respectively with the upper and lower shoe sections of
the die set are always located at a given single position
tive relation to one another without resort to trial and
error closing of said shoes or the use of supplemental
gauging apparatus, thereby providing for interchange
ability of said punch-supporting and die-supporting means
between duplicative die sets.
2. A die set as de?ned in claim 1, wherein said die-sup
porting means comprises at least one rectangular plate
member, and said indexing means comprises three tri
angularly related abutment surfaces projecting outwardly
from one edge of said plate member, one of the abutment
when interchanged between duplicative die sets, this being
made possible due to the locating means of both the 55 surfaces of said indexing means being engaged with a sur
face on the bushing of one of said guide assemblies and
upper and lower shoe sections being indexed and arranged
the other two abutment surfaces of said indexing means
in given angular and distance relation to the axes of the
being engaged with two circumferentially spaced surfaces
pin and bushing members.
on the bushing of another of said guide assemblies.
In view of the foregoing, it will be seen that the present
3. A die set as de?ned in claim 1, wherein said punch
invention provides a novel and improved die set construc
supporting means comprises a plywood block having at
tion characterized by its ability to interchangeably receive
least two angularly related edge surfaces, and said ?rst
and support a cooperative set of punch and die-supporting
members in predetermined accurate closing alignment
named abutment means comprises at least two surfaces
without resort to laborious and expensive prealignment 65 disposed in the same angular relation to one another as
the said edge surfaces of said block and at ?xed, prede~
and attachment procedures. Die sets formed in accord
termined distances from said guide assemblies.
ance with the present invention make possible the storage
4. A die set as de?ned in claim 3, wherein said block
and shipment of only the relatively light-weight die and
is of generally ?at, rectangular con?guration, and said
punch-supporting blocks or plates independently of the
relatively heavy and large shoe members of the die set. 70 ?rst-named abutment means comprises a pair of perpen
Thus, assuming that two or more die sets of a given size
and con?guration, formed in accordance with the present
invention, are disposed at different locations, a given set
of punch and die members may be interchanged between
dicularly related rectangular surfaces de?ning on said one
shoe an entrant corner to receive a corner portion of said
block, the perpendicularly related rectangular surfaces
of said ?rst-named abutment means serving to prevent
such die sets with a minimum of costs and labor and 75 movement of said block in two directions on said shoe.
3,062,083
11
5. A die set comprising a pair of relatively thick, plate
like shoes; at least two relatively spaced apart sets of rel—
atively telescoping pin and bushing members connecting
12
detachable as units from said shoes without disturbing the
relative positional arrangement of said sets of pin and
bushing members.
6. A die set as de?ned in claim 5, wherein said other
said shoes for guided, reciprocating movement toward and
of said supporting means comprises a pair of superposed,
from one another; ?rst and second die and punch-support
detachably connected plate members of different thick—
ing means; locating means carried by one of said shoes
and de?ning thereon at least two angularly related abut
,nesses, the thinner of said plate members being adapted
to directly support thereon a punch or die element, and
ment surfaces against which one of said supporting means
wherein said indexing means is carried by and projects
may be positioned to locate the latter at a single given
position on said one shoe; means carried by said one shoe 10 outwardly from an edge of the thicker of said plate mem
for releasably holding said last-named supporting means
bers.
in said single given position therein; indexing means car
ried by the other of said supporting means and engaged
with the bushings of at least two of said sets of pin and
bushing members for locating said other of said support 15
ing means in a single given position on the other of said
shoes, said indexing means including three relatively
spaced, angularly related, ?at surfaces, one of which sur
faces is engaged with one surface on the bushing of one
set of pin and bushing members and the other two of 20
which surfaces are engaged with two circumferentially
spaced surfaces on the bushing of another set of pin and
bushing members, whereby to prevent lateral displace
ment of said other supporting means on the other of said
shoes; and releasable fastening means carried by said 25
other shoe for securing said other of said supporting
means in said single given position thereon, said die and
punch-supporting means and said indexing means being
References Cited in the ?le of this patent
UNITED STATES PATENTS
636,913
1,447,247
1,801,490
1,954,708
2,163,229
2,275,706
2,364,401
2,379,271
2,381,062
2,545,560
2,850,096
Mergenthaler ________ __ Nov. 14,
Hilsdorf ______________ __ Mar. 6,
Falstrorn ____________ __ Apr. 21,
Mass ________________ __ Apr. 10‘,
Knebel ______________ __ June 20,
Wales ______________ __ Mar. 10,
Stellin ________________ __ Dec. 5,
Bechtel ____________ __ June 26,
Kirsch ______________ __ Aug. 7,
Scott ________________ __ Mar. 20,
Berlin ________________ __ Sept. 2,
1899
1923
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FOREIGN PATENTS
566,272
Great Britain ________ __ Dec. 20, 1944
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