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Патент USA US2407892

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Sept. 17, 1946.
G. w. MCKINSTRY
_
2,407,891 >
SAFETY APPLIANCE
Filed May v22, 1943
I2
36
GEORGE w. McKlNSTRY
'
INVENTOR
‘BY
'ITORNEYS
Patented Sept. 17, 1946
2,407,891 '
YUNITQED STATES
cornice '
-to 'Bausch & Lomb Opticz'il??ompany, Roch.- ’
ester, N. Y., a corporation‘ of'New'York
Application May 22, 1943, ‘Serial N0.Y48‘8,0V75
' .5 Claims. (o1; 7.215615)
This invention relates ,to a safety appliance
mountimportance when the operator is err-pinned
and :more' particularly: to ‘a locking device for
guards used on punch presses, stamping ma
one pieceworh incentive basis in which casethc
chines, iandwthe . like.
operatoris intent on securing ainaximurn guane
ti-tvofstamped workpieces with a nnnimum-Qf
:Heretofore, it‘ has been -,customary to provide a
01
guardfor stamping machines which utilize-a lever
arrangement ,for permitting the‘machineto be
operated when a shield a?ixedthereto ‘has been
positioned in .front of the orperatortogprotect the
person. of theoperator frominjury caused {by ac
eratordueto the speed demanded. and ‘also-pro
motesiatigue of the mental and ‘physical iacul
cidentaliorcibie dislodgmentof the workpiece
:Asthe. shield was positioned in, its protective. plane
‘by depression of. a handle a?ixed to alever con
‘ties, resulting infailureto coordinate thesezfacule
ties to secure optimum safety in the use of ‘the
trolling the operation of . the. a machine, the lever
arrangement would. automatically ‘operate the
15
machine, permitting one of the dies to forcibly
.function of the ‘guard was primarily usedlas a
protection ‘for safeguarding the operator from
theiorcible ejection of ‘the workpiece on'the per
20
.
ent invention will appear ‘from. the following. de
scription taken in ‘connection-M1311 the acompany
‘
a
‘
I
,
.Fig. 1 is a-frontelevation of, my device attached
to a stamping machine.
tionary-die with one hand while the other hand
depressedjthe handleto bring the shield in front
of the-operator, andtoactuatethe machine. Due
Fig. 2 is a perspectiveview-of my deviceapplied
25 ‘to a guard of a stamping machine.
'
‘
Fig. 4 is (a. perspectivenview. of 1a fragmentary
portion of the guard‘ andsafety appliance.
’
hands, in performingthis,operation, the ‘hand
manipulating the workpiece was frequently in
inredhy: the movable die. because. the operator did
notremove-the hand in theinterchangekof work
pieces with the stationarvdie in unison with the
other ‘hand actuating the machine-operating
'
Fig. 3 is a sideel-evation of my device.
tothc failure to coincide the. movements. of the
30
The device of the present invention, for the
purpose of‘ illustration, , has} been shown attached
to arstamping machine.
.
'
1 .
V V
The stamping -~machine, in the‘ present instance,
is shown as ,a conventional punch press ‘having
‘handle or by the negligence inthe operation of
.
.Thusithe guard failed?to protect the hands ‘of
t .eoneraton-and it is an object of the present in
ventionpermits the‘ operator to secure the desir
ing drawing in which:
;In the actual'use ofthezguard, the operator po
sitioned .andrremoved :the workpiece on the sta
the, machine.
hands The. safety appliance of theprescnt in
able ‘benefits of the‘pieceworksystem, while guare
.anteeing the safety of the‘ hands of the operator.
Othernovel objects and advantages ofthepres
impact'the‘workpiece onthepther die. Thus, the
son of-theoperator-
time expenditure. Inso doing, the operator ‘must
necessarilylhevcry active in the mani-nulationof
theworknicccsand the operation of the machine
.WOI‘lQJOf this charactertends to engender care
.iessness and negligence in .theactmns ofvetheon
35
vention toprovide mechanical means employing
‘the usual 'frame'members, ‘generally ,indicated‘by
the numerals .IB and I I. Between these members
there is mounted the operating’ mechanism‘com
prising acrank shaft l2 to which a plunger [3 is
{the use ofw'both of the 'hands for securing opera
connected for,reciprocationqthereon. The plung
tion of the machine, and‘to thereby safeguard the
er l3 has an attached coupling member for re
ceiving .a removable die 14. The die“ is mova
Fbleby the plunger to contact. a workpiecesup
portedon a stationary die mounted in. a bedplate
l5 onka shelf vI 6‘ integral with the press. Located
at onesideof ‘the press is a lever I‘! for; controlling
the motive power operating the press. When the
lever I‘! is pulled downwardly. the lever will 1161'»
mit. the ‘motivatingiorce :to actuate the crank
hands, of- the operator from injury resulting from
interference with the shaping elements of the
machine. ‘This ‘desirable result is achieved by
employment of a lockingr device that retains the
guard. in an inoperative position and which must
be, released andheld by one hand of the‘operator
while theother‘hand depresses the handle on the
guard "to secure operation of the machine. In
shaft‘ 12 for reciprocating the plunger 113. The
this manner, "both “hands of the operator are
used .to actuate members instrumental for opera
non of‘the machine, which precludes injury to
the hands by. the negligence. of the operator.
,The present invention is particularly adapted
tQI-saieguard the hands-of the machine operator
in'modern production methods. ,It is of para
50
plunger l3 will force the die l4 onto the workpiece
held by the stationary die, forming ‘the work
piece'into a desired shape.
.
In the use of the punch press, itiislaccommon
' ractice to provide a guard to be positioned be
tween the die *bedplate. and the operator ,toTpro
tect the operator ‘from the workpiece should'it'be
2,407,891
'
'
'
l
~
,u'
bar such as might occur through wear of the
incorrectly struck by the movable die and from
fragments broken off from the workpiece when
the workpiece is struck by the die. Such guards,
generally when lowered to their protecting posi
tion, will actuate mechanism to operate the press.
The guard, as herein shown, is pivotally
coupling parts.
To permit the guard to be lowered in the oper
ation of the press, a trip arm 35, ?xed to the post
3|, is formed with a handle portion spaced from
the handle 28 of the lever and which must be
grasped by one hand of the operator to pivotally
mounted at one side of the bedplate of the press
move the bar 32 out of the position shown in Fig.
and comprises a lever, l8 and a transparent shield
2 to one wherein the end face thereof no longer
IS. The lever '18 is?xed in a collar pivotally se
interferes with the actuation of the lever 18.
cured toa yoke 2| on the power controlling lever 10
To relieve the operator from manually actuat
['6
Of
the.
l1 and is pivotally attached to the shelf
2‘ ing the handle portion of the trip arm 35 to re
press by means of a pin 24 passing through open
of the bar 32 to a position un
. turn the end face
ings in a coupling member 22, a collar 23-, and the
l8, means are provided in the
derlying
the
lever
lever l8. The shield l9 comprises a plate 26 of
present invention for automatically performing
15' this actuation for the operator. Although vari
ous means may be used to secure this desirable
toughened transparent material ?xedly secured
in a frame 21. The frame 21 has its ends formed
in the shape of loops to encircle the lever l8 and
result, in the now preferred embodiment of the
is securely fastened thereto. A handle 28 is at
invention, this means comprises a spring 36, one
tached to the lever |8 for manual manipulation
end of which is ?xed to the bracket 34 while the
of the lever. A spring 229 is fastened to the frame 20 opposite end is connected to the post 3|. The
of the press and the yoke 2| of the lever H to
spring 36 pivotally moves the post 3| and the bar
resist in pulling the lever l1 and the attached
32 rearwardly to a position wherein the end face
lever l3 downwardly to their operative positions,
of the bar 32 again lies beneath the end of the
‘and-to normally hold the shield out of its pro
lever IS. A stop pin 34, ?xed to the bracket34
the
handle
23
is
forci
25
tecting position. When
limits the return movement of the post 3| and
bly depressed by the operator, the guard will
de?nes the position of the same in which the end
move downwardly to a position intermediate the
face of the bar 32 is disposed beneath the free
‘bedplate and the operator, and actuate the lever
end of the lever l8.
1
H to ‘cause the operation of the press. It will
It will be seen now that depression of the trip
be clear that the guard when moved to its press 30 an'n 35 by one hand of the operator pivotally
operating position will prevent injury to the op
moves the end face of the bar 32 from its normal
erator'by accidental discharge of the workpiece
or fragments thereof when the workpiece is
struck by the die.
7
position underlying the lever l8 so that the same
may be lowered by depression of the handle 28
by the other hand of the operator to actuate the
Many operators to increase their production, 35 press. Due to the action of the spring 36, the trip
while operating the guard with one hand, used
arm 35 must be pushed downwardly and retained
their‘ other hand to position the unshaped work
in its lowermost position by the one hand of the
‘
die and sometimes to re
piece on the stationary
operator until the guard is lowered. Of necessity,
move the shaped workpiece therefrom after oper
the operator must employ both hands to secure
ation of the press. In so doing, the hand of the 40 operation of the press, thus insuring freedom
operator manipulating the workpiece, due to fa
from injury to the hands, by eliminating any
tigue or activity engendering carelessness or neg
possibility of the hands being inserted between _
ligence, may fail to coordinate itself with the
the‘ descending die and the stationary die.
hand actuating the guard and is frequently in
To insure ‘that the lever I8 will return to‘, its
>
lured by the descending die.
normal position over the‘ free end of the bar 32
The safety appliance of the present invention
and without‘ restraint that might-otherwise be
is particularly adapted to prevent injury to the
provided by the under surface of the flared por
free hand of the operator by incorporating with
tion of the bar 32, the bar 32 is formed along its
the guard other mechanism which, spaced from
rear edge with a cam surface 39 to be engaged
‘ ' the handle 28, requires actuation by the free hand
by the end of the lever l8 upon its return move-'
before‘the guard can be lowered. This mecha
‘ment‘. Thecamming action brought about by
nism, in the broader aspects of the present inven
the sliding engagement of the lever |8 along the
tion; may comprise any means which forces the
rear edge of the bar 32 forces the same forward’
operator to use his free hand to actuate the same
against the action of the spring 36 and permits
just prior to the actuation of the guard by his
' the lever to ride over the nose of the cam and
other hand. In the now preferred embodiment
assume its normal position as shown in Fig. 2.
of the present invention, this means comprises a
From the foregoing, it will be apparent that I
post 3| pivotally connected by a pin 33 to a brack
am able to attain the objects of my. invention
et 34 mounted on the shelf IS. A bar 32, carried
and provide a new and improved safety applié
by the post 3|, extends upwardly thereof and ter 60 ance which is efficient and trustworthy in oper
minates in a flared portion presenting a ‘relative
ation. Various modi?cations of structure can-be
ly long end face. The bar 32 is adjustably
made
without departing from the spirit of my
mounted to the post 3| by means of bolts 38
invention or the scope of the appended claims. '
passed'through a slot formed in the post and
threaded into- tapped sockets in the bar 32.
As ‘
the bar is movably mounted to the post, it may
' be adjusted to bring the end face thereof to a
position underlying the free‘end of the lever l8.
It will be seen that with the bar 32 in a position
wherein the end face thereof underlies the end
of the lever, it will be impossible for an operator
to lower the guard carried by the lever. - As the
end face of the bar 32 is relatively wide, it will be
effective to prevent movement of the lever even
I claim:
-
'
. r 1. In a machine of the type described having
a bedplate for holding a workpiece to be acted
upon by a die, the combination of means for
moving said die into work engaging position;
guard means adapted to be actuated by one hand
of an operator and movable to a position inter
mediate said bedplate and the operator, .said
guard means actuating said moving means as the
same, is moved to said intermediate position;
though the‘lever is notperfectly aligned with the 15 means for locking said guard means, against
5
2,407,891
movement; and means spaced from said guard
means and requiring the other hand of the op
erator to actuate the same to release said look
ing means.
2. In a machine of the type described having
a bedplate for holding a workpiece to be acted
upon by a die, the combination of means for mov
ing said die into work engaging position; guard
means mounted at one side of said bedplate and
guard means actuating said moving means as the
same is moved to said intermediate position;
means for normally holding said guard means
out of said intermediate position; means mount
ed on the other side of said bedplate for locking
said guard means against movement; means car
ried by said locking means and requiring the
other hand of the operator to actuate the same
to release said locking means; means for return
adapted to be actuated by one hand of an op
erator for movement to a position intermediate 10 ing said locking means to 'a normal operative
position upon release of the actuating means of
said bedplate and the operator, said guard means
said locking means, the said holding means mov
actuating said moving means as the same is
moved to said intermediate position; means for
locking said guard means against movement;
ing said guard means out of
'
15
ing means and engaged by said guard means on
said guard means;
and means mounted on the other side of said bed
its return movement for moving said locking
its operative position whereby said
plate and requiring the other hand of the oper
ator to actuate the same to release said locking
guard means may be returned to its normal posi
20 tion by said holding means.
means.
5. In a machine of the class described having
a bedplate for holding a workpiece to be acted
upon by a die, the combination of means for mov
ing said die into work engaging position; a lever
pivotally mounted at one
3. In a machine of the type described having
a bedplate for holding a workpiece to be acted
upon by a die; the combination of means for
moving said die into Work engaging position;
guard ‘means mounted at one side of said bed
plate and adapted to be actuated by one hand of
an operator for movement to a position inter
mediate said bedplate and the operator, said
guard means actuating said moving means as
the same is moved to said intermediate position; 30
means for normally holding said guard means
out of said intermediate position; means mounted
on the other side of said bedplate for locking
35 to said moving means for normally holding said
lever out of said intermediate position; a locking
member pivotally mounted at the other side of
said bedplate; a second spring connected to said
locking member; a stop pin for limiting the move
40 ment of said locking member by said second
spring whereby said locking member is normally
requiring the use of one hand of the operator
in order to permit actuation of the guard means
held in a position underlying said lever; a trip
by the other hand of the operator to operate 45
said machine.
4. In a machine of the type described having
a bedplate for holding a workpiece to be acted
GEORGE V7. MCKINSTRY.
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