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Патент USA US2404675

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My 23, 19%;.
‘ Filed Dec. 11, 1943
FIG. u
FIG. 3
Patented July 23, 1946
Alan E. Vosburg, Chicago, Ill., assignor to Tele
type Corporation, Chicago, 111., a corporation of
Application December 11, 1943, Serial No. 513,981 '
3 Claims. (01. 74-615)
This invention relates to safety appliances and
The present safety apparatus comprises, in gen
more. particularly to a safety guard to protect an
operator duringv the use of hazardous machinery,
such as punch presses and the like.
eral, an upper plate vwhich is securely fastened
to the reciprocating part of the machine onwhich
relatively small piece parts, it is frequently neces
sary that the piece parts he successively fed to
various points thereon whereat the operation is
to be performed. While there have been many
devices proposed to impart automatic stepping
cured to the lower die shoe, and a plurality of
it is used, which part may secure a punch or
‘ During machine operationson various types of Va the like, a lower frame which is removably se
motion to the piece parts, in many cases it is
necessary that the step-by-step feeding be done
springs extendingbetween the upper plate and
'the lower frame. Thus, the plate, frame, and
springs form a compact unit which is a constant
protection to the operator but which may be '
placed adjacent the ‘working parts of the ma
chine, inasmuch as the upper plate is designed
to reciprocate with the tool holder to which it
is secured while the lower frame is designed to
,At the present time there has been perfected
many different types of safety appliances to be 15 be stationary, resulting in a constant extending '
utilized with machinery such as punch presses and
and compressing of. ‘the springs therebe-tween.
the like, for the protection of the operator. Prob
The features and advantages of the invention
ably the best known types are of the cage variety
will become apparent from the following detailed
which extend completely around the reciprocat
description of a speci?c embodiment thereof, when
ing tool holder and tool of the machine and are 20 read in conjunction ‘with the following drawing
either raised upwardly or have a pivoted opening
by means of which the piece parts may be moved
in which:
after the machine operation, and the swinging
Fig. 1 is a detailed perspective view, partly
broken away, of the device embodying the inven
arm type which is simply a pivoted arm which au
tion as attached to a power punch press;
tomatically reciprocates from side to side be 25 Fig. 2 is a detailed view of the upper plate
tween the operator and the operating machine
forming part of the invention, as viewed by look
parts during-operation thereof. While it is true
ing upwardly, as in Fig. ‘1; and
that‘these devices work satisfactorily, it is neces
Fig. 3 is an enlarged perspective view, partly
sary that they be built well away from the re
broken away, showing the connection between
ciprocating tool of the machine which, therefore,
the device embodying the invention and the base
precludes theoperatorfrom keeping his hands
to which it is connected.
adjacent the tool during operation. This is a
The present invention has been illustrated and
distinct disadvantage in that machinery that is
will be described as being used in connection
used to operate on small parts is often provided
with a power punch press. However, such an ap
with manual piece part feed means, which ne 35 Dlication has been used for the sake of illustra
cessitates the machine operator having his hands
tion only and it is to be understood that the
close to the moving tool. Thus, such a safety de
invention is applicable to many other types of
‘vice could not be used on machinery having the
industrial machinery.
above-mentioned feed means.
As shown in Fig. 1, the punch press comprises
Accordingly, the object of this invention is to 40 a basal! on which is securely positioned a die
provide a safety apparatus which while serving
shoe H, by means of any suitable fastening de
to protect the machine operator allows the 0p
vices (not shown). The die shoe l2 has an up—
erator’s hands to be in close proximity to the
wardly extending circular section [3 which. is
reciprocating tool holder and tool of the ma
smaller in size than the outer contour of the
45 base‘of the die shoe. Rotatably positioned around
The invention consists of an elastic cage which,
the upwardly extending portion l3 of the die shoe
under all conditions of a reciprocating‘ tool hold
I2 is a feed ring [4 which may be manually po
er, provides a barrier against inadvertent expo
sitioned by means of three upwardly extending
sure of an operator’s hands to injury by the tool
rods 16.‘ A segment ll of the feed ring I4 is
and die elements. Such precautions are aggre~ 50 formed on its front edge with a series of notches
vated in the case of code segment punching where
18 ‘which serve as guides for successive feeding
an arcuate piece part is variously positioned as a
movements of the ring [4. A post [9 is mounted
code notch cutting punch is operated to remove
on the die shoe 12, carrying a pawl 2|! towards
various peripheral sections according to the par
its top and having aspring 22 thereon normally
65 urging the pawl in a clockwise direction, as viewed
ticulars . of , a coded element;
in ‘Fig. 1. The pawl 2| is positioned in line with
shoulder 3| and is smaller in diameter than either
and adjacent the segment I‘! of the feed ring 14
the head or shoulder, riding in the slot 49. As the
slot 49 is just slightly wider than the stock 33 the,
and is utilized to engage the notches ill in the
segment l'l, thus holding the feed ring I4 in the
frame 46 cannot pass up over the head 32 nor
position to which it has been set. A pin 23 is 5 down over the shoulder 3|. The frame is thus
mounted to the die shoe l2 and will resist any
mounted on the die shoe l2 and acts as ‘a limit
to the outward movement of the pawl‘ 21 when the
vertical. motion". In order to remove the frame 45
operator manually rotates it in a counterclock
wise direction, as viewed in Fig. 1, against the
tension of the spring 22, in order to release its-1e
end from a notch I8 and thus be able to position._
the feed ring I4 to the next notch. This is done
successively throughout thew-number ofnctches, _
it is only necessary to impart horizontal motion
to the frame to the extent that the circular open
ing 48 will be positioned in alignment with the
head 32 of the locating pin 29, the frame then
being lifted over the head of the locating pin 29.
A plate 51, as shown in Fig. 2, is formed with a
circularopening; 52, three small screw openings
A piece part 24 is located in place on the feed 15 in which are; shown screwsv 53, and a ?ange 54
IS in the segment I1.
ring 14 by means of two pins 25 which pass
through two holes in the piece~~part 24. Asthe
piece part 241s arcuate in shape two guides. 21,
are provided, one near either end of the piece
part, in order to more securely hold the piece
part in place. for the punching operation. The
guides 21* are. secured to the feed ring l4.‘ by any
suitablemeans (not shown) .
The speci?c'piece part 24 which hasbeen il
extending from all four sides of the plate 5|.
The plate is designed'to be positioned above the
punch block 4|, the cylindrical member by which
the punch block is held in the upper block 36 and
which is not shown in the present drawing pass
ing through the circular‘opening 52. Theplate
5| is then securely fastened to‘the punch block 4|
by means of the screws 531 which pass through
the screw holes in the plate. The plate is shown
lustrated in. the: drawing is a. blank which is to 25 after it has been secured in position in Fig. 1,
be formed witha seriesv of notches of various sizes
wherein the ?ange 54‘ is shown as‘ extending
and at various. points in the edge having the
smaller radii. After manufacture, this particu
lar. piece part, is- used as a. code. bar in printing
54 have a series of aligned openings therein
formed at spaced intervals the entire length of
telegraph apparatus.
Four locating pins- 29 are securely fastened
1 within. the circular upwardly extending portion
l.3.of the die. shoe [2.
As‘- more clearly- shown in
Fig. 3,. the locating. pins 29;. are formed with a
Both: the lower ?ange 41' and the upper ?ange
the flanges. A series of springséBB having hooked
ends engage the openings and extend between the
upper plate 5! and lower frame 41. The springs
56 should be so made‘ thatrwhen the upper block
shoulder 3|, a head 32, and a-metal stock 33sep
arating they head and the shoulder but being less
35 is in its upward position, at which-time no
punching occurs, the springs are extended.
in. diameter than the head or- shoulder. The
During the operation of the punch press, the
utility. ofithe locating pins will be. explained here
upper member 36; and the-parts secured there
to, move downwardly to a point- at which the
ASaELlSO; shown in. Fig. 1, a. punch holder 364 is 40 punch 42 notches the piece part 24. During this
illustrated as being above the members just de
operation the'springs 56 will no longer be held
scribed, and separated therefrom. The punch
under tension but instead will be put under‘ a cer
holder 3iiqhasva. block 31 positioned at the front,
tain' amount of compression which may cause
which is secured. tothe punch: holder by, means
the springs to buckle inwardly, outwardly, or to
of bolts 38. and tightened thereon by means of 45 ward the sides; However, because of- the great
nuts_3~9. Upon. loosening the nuts- 39git is possible
number of springs used and the relatively small
to insert an upwardly extending cylindrical-‘por
amount of movement of' the upper member 35,
tion. (not, shown). of the punch‘ block 4!. The
the resulting relatively small‘ amount of- compres
punch. block 4|. has a. punch->42 extending down
sion of the springs does not permit sufficient
wardly therefrom-which- performs the notching
movement of the springs to present any large
operations on the piece parts. 24. As thepunch
opening between any two adjacent springs.
block 41 is removable it is possible to change. the
Thus, it maybe seen that thesafety‘ appliance
type of punch utilizedv intheimachine, depending
embodying the present invention may be con
upon the type of notching operation to be per
structed as a compact unit and be placed in close
55 proximity to the working parts of the machineron
A frame 45 having anvupwardly extending edge
which it is installed. For this reason, it is possi
41 on all four sides thereof islremovably secured
ble for a machine operator to-place his hands in
to the circular upwardly extending portion I3
close proximity to the operating partsv to feed a
of. the die shoe. 12 by means of the locating pins
piece ‘part, or for any other reason, and yet be
29. Asmore clearly shownin Fig. 3, the-frame 46
protected from injury“ from the- reciprocating
has a seriesof four specially formed openings
punch by means of the safety device above
each of which comprisesga large circular opening
48 which is slightly larger» in size than the head
Althougha speci?c embodiment of the inven
32. of the locating. pin ‘2 9, and a-slotted portion 49,
tion has been shown and described, it will be-un
which is. slightly wider than the metal stock 33, ‘ , derstood that this embodiment is but illustrative
extending from the circular opening 48 length
wise of. the frame 46.. The circular opening 48
and the‘ slot 49 together assume the shape of a
and that various modi?cations may‘ be‘made
therein without departing from the, sco-peand
spirit of this invention.
keyhole. Thus, it is possible to removably secure
What is claimed is:
the frame 45 to the die shoe» l2’ by slipping the 70
1. In combination with a punch-press includ
frame over the locating pins 29, the circular
ing a reciprocating punch holder-rand a’ sta
opening 48 passing over the head~32. The frame
tionary die shoe, asafety device comprisinga
is then- pulled forwardly, as viewed in Fig. 3,
plate securely connectedv to said reciprocating
which results in the metal stock 33» of the locat
punch holder, a frame‘ having‘ openings therein
ing pin29, which-is between the head.32 and the
formed of a large circular section :and‘ a slot
joining the circular section removably connected
to said stationary die shoe through bolts in said
die shoe engaging the openings in said frame, and
a ‘plurality of springs each connected to said plate
and to said frame, whereby upon reciprocation
of said punch holder said springs will be com
pressed and extended to afford protection to the
‘punch press operator under all conditions of oper
3. In combination with a punch press including
a reciprocating punch holder and a stationary die
shoe, a safety device comprising a plate securely
connected to said reciprocating ‘punch holder, a
frame having a plurality of openings therein each
formed of a circular opening and ah‘orizontally
disposed slot connecting thereto, a plurality of
pins securely fastened to said die shoe each
formed with a circular head slightly smaller in
2. In combination with a punch press includ 10 size than the circular opening in said frameLa
reduced body section directly below said head
ing a reciprocating punch holder and a sta
slightly smaller in size than the slot in said frame,
tionary die shoe, a safety device comprising a
and a wide shoulder immediately below the re
plate securely connected to said reciprocating
‘punch holder, a frame having openings therein
formed of a large circular section and a slot join
ing the circular section, means to reinovably con
nect said frame to said die shoe including bolts in
duced body section, said pins and openings coop
erating to allow said frame to be removably se
cured to said die shoe, and a plurality of springs
each connected to said plate and to said frame,
whereby upon reciprocation of said punch holder
said die shoe engaging the openings in said frame,
said springs will be compressed or expanded to
and a ‘plurality of springs each connected to said
plate and to said frame, whereby upon recipro 20 a?'ord protection to the punch press operator
under all conditions of operation.
cation of said punch holder said springs will be
compressed or extended to afford protection to
the punch press operator under all conditions of
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