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Патент USA US2111060

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Mm}; 15, 1938.
Filed April 20, 1936
5 Sheets-Sheet l
March 15, 1938.
Filed April 20, 1936
s Sheets-Sheet 2’
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March 15, 1938.,
Filv_ed\ April 20, 1936
3 Sheets-Sheet 3
Patented Mar. 15, 1938
Percy E. Boyd, Detroit, Mich.
Application April 20, 1936, Serial No. I75,291
4 Claims.
This invention relates toimprovement in safety
appliances ‘adapted for punch presses, and pro
vides a device of this’ character embodying a
certain mechanism that is coordinated with the
clutch of the press for the purpose of preventing
premature engagement and disengagement of the
same, which is due to the corners of the jaws of
the clutch head and those of the bull gear being
rounded as result of Wear.
(Cl. 192—24)
venting premature disengagement of the press at
all times.
Another object of the invention is to improve
the device as set forth in United States Patent
No. 2,014,758, issued to me September 17, 1935,
and to further the development in this particular
line of industry.
The invention possesses further advantages, all
of which will appear concurrently with the fol
As this wearing- process becomes more severe
the rounded corners of the clutch jaws have a
lowing detailed description, illustrated through
tendency to engage the ‘jaws of the bull gear con
pointed out in the sub-joined claims.
With reference to the drawings:
Figure 1 is a reduced partial view of the punch
tinually‘when the latter is idling and with a pro
r nounced clattering or pounding effect, thereby
causing a rapid wear and rounding of all corners
of both sets of jaws, and to the extent whereby
‘all of the jaws must be removed andlreplaced
with new ones, which requires considerable delay
and expense at frequent intervals from this cause.
Also with this dif?culty the crank of the press
willvnot be caused to stop precisely at high dead
press and as the device will appear thereon; and
in this view the jaws of the press are shown with
the proper clearance when the bull gear is idling.
Figure 2 is also a reduced partial view of a
punch press, and showing the device in the act
of releasing the jaws of the clutch, head from 20
those of the bull gear..
vcorrectly. On the contrary the crank will stop
approximately from ?ve to ?fteen degrees before
high dead center is reached. This condition pre
vailing the crank will have the tendency to, and
very frequently does drop to low dead center,
Figure 3 is a top plan view of the hanger of
the device, and broken in places as indicated.
Figure 4 is an elevation of the hanger pin.
Figure 5 is a part section and front elevation of
the bracket and hanger.
Figure 6 is a side elevation of the bracket with
simultaneously operating the press .at an unex
a portion thereof broken away as shown.
center as it should do when the same is operating
pected time and without Warning to theoperator,
30 which may result in a serious, accident to him.
It is understood that the jaws of both the bull
gear and clutch head of punch presses have per
fectly sharp edges when they are new, and as
these elements are engaged in repeated opera
35 tions the edges will become rounded thus per
mitting their premature engagement and disen
gagement, whereas if said edges arev kept from
being worn this condition is avoided, and it is
the purpose of this invention to prevent the wear
40 ing of the clutch jaws and thereby make it im
possible for the dangerous accidental tripping of
the press and rendering the same decidedly more
safe for the operator.
Premature release of the clutch‘jaws is due to
45 the worn condition of the clutch jaws. When
the jaws are new and unworn, they are sharp and
remain in engagement until roller 0 reaches a
point upon cam M corresponding to high dead
center of the press. Torque is transmitted
'50 through the clutch until theclutch jaws fully
clear each other. With worn jaws however, when
the movable jaws are retracted to a point such
that the worn ends of the jaws overlap, there is
‘a component of force tending to cam the mov
able jaws away from the other jaws before roller
0 has reached the point on cam M correspond
ing to high dead center of the press.
The principal object of this invention is to com
60 pletely overcome this di?iculty by positively pre
out the accompanying drawings, and more fully
Figure 7 is a top plan assembly of the complete
Figure 8 is a top plan view of the bracket.
Figure 9 is a front elevation of the hanger.
Figures l0, l1, and 12 are greatly enlarged
cross sectional views of both sets of jaws of the
press, and Figure 10 indicates a worn condition 35
of the jaws; Figure 11 shows the jaws when they
are new and unworn, and Figure 12 shows an
advanced state of worn jaws, or approximately
the usual limit in this respect.
Figure 13 is a reduced elevation of the plunger
safety cap.
Figure 14 is a. sectional assembly of the cap‘
taken vertically through the center thereof.
Figure 15 is a top plan view of the safety cap
Figure 16 is a section taken directly upon line
l?-lii of Figure 14; and Figure 17 is a section
upon line l'l-—I'I of Figure 14.
The invention comprises hanger l of the forma
tion as indicated and is adapted to be detachably
secured to frame A of the press by cap screws 2
where shown, and remains permanently in this
relation with said frame.
A bracket is provided, having body 3 and the
upper portion of said body being extended there
from and forming neck 4 with transversely ex
tending aperture 5 therethrough, and said
bracket is adapted to be pivotally secured to
hanger l by means of pin 6 with said aperture
and the usual cotter pins therefor. Apertures 60
15 in hanger l are provided to accommodate
pin 6.
Extended from neck 4 is enlargement 1 having
vertical passage 8 therethrough for accommodat
ing plunger B, also enlarged vertical passage 9
through lower enlargement I? of the bracket for
accommodating the lower portion of said shaft.
Referring to Figure 8 hub H is provided and is
projected from body I where shown so that lever
10 C
may be pivotally secured thereto by cap
screw I2.
turn of roller 0 into the path of cam M, the clutch
is disengaged. While torque is being transmitted
through clutch jaws J and K, cam M swings the
plunger B to the tilted position shown in Figure
2, thereby initially compressing auxiliary springs
As soon as roller ,0 and cam M effect the
disengagement of the clutch jaws, springs D react
through roller 0 and cam M tofurther separate
the clutch jaws as shown in Figure 1.
Thus, when
the clutch is disengaged, there is always ample 10
. clearance between the clutch jaws and accord
bracket so as to clear spring D upon sleeve E and
ingly, the undesirable wearing of the corners
thereof is prevented.
Having thus fully described my invention, what
stud F, and referring to Figure 1 it is understood
that studs F are adapted to threadedly engage
I claim as new is:
1. In a safety mechanism for a punch press, a
frame A as at G.
brackethaving a vertically disposed body, an en
In Figure 6 elongated recessed portion I3 is
provided upon each side of enlargement ill of the
The lower end of plunger B has eccentrically
mounted roller 0 thereon which is adapted to
engage clutch head H, and it is further understood
that by virtue of springs D'jaws J of said'head
will remain clear of jaws K of bull gear L. When
the clutch is tripped for causing engagement,
roller 0 is retracted upwardly until it is out of
the axial path‘ of cam M‘and all parts of the
clutch head 1-1. It is understood that after'the
operation of the press and cam M returns to nor
mal position as in Figure 1, jaws J and K will be
largement projected from the lower portion of
said body having a vertical passage therethrough
for accommodating the plunger of a punch press,
the combination with a‘ pair of studs, one of said
studs disposed upon each side of said enlarge
ment and adapted to pass through aforesaid body
and to threadedly engage the frame of the press,
each of said studs having a sleeve with a spring 1
upon the sleeve, means within each of said sides
‘of therenlargement for clearing said springs, com
prising an elongated recessed portion.
with a tension adequate so as to overcome springs
2. In a safety mechanism for a punch press, a
bracket having a vertical body, an extended en 30
N, and in this manner it is clearly understood
largement upon the upper portion of said bracket
that springs D will "prevent engagement of jaws
J of clutch head H. and jaws K of bull gear L,
and ‘a similar enlargement upon the lower por
tion thereof, both of said enlargements having 'a
thus positively preventing operation of the press
vertical p'assage'thereth'rough for the accommo
when the same is idling and vwear of the clutch
dation of, the'plunger of the press,-a hub ex 35
tended upon one side of said bracket and at right
completely disengaged and springs D are provided
jaws. In the construction of punch presses it
has always been customary to provide a weight angles theretovfor accommodating a lever of the
that is mounted upon the top end of plunger B, trip mechanismofthe' press,’ and an elongated
for obvious reasons, and 'due to the proportion , recessed portion upon each side of aforesaid lower
40 of this weight and being inadequately supported enlargement so as to clear a pair of studs pass- 740
to said plunger, very frequently it breaks off of ing through aforesaid body and threadedly en
the plunger and falls to the ?oor and with grave gaging the frame of the press, each of said studs
danger of injuring the press’operator and "other having a sleeve and a spring upon said sleeve.
3; In a safety mechanism for a punch press,
In order to completely overcome this difficulty
a safety cap arrangement is provided and com
prises housing ld which is adapted to be detach
ably secured to the top surface of enlargement
a hanger and means for’ securing same to the 45
frame of the press,‘a bracket and means for piv
otally securing the same to said hanger, an en
accommodation of screws I6 as indicated.
largement upon the upper portion of said bracket
and a similar‘ enlargement upon the lower por
tion thereof, each of said enlargements having a
‘vertical passage therethrough for the accom
modation of the plunger of the press, a hub ex
tended upon one 'side of said bracket and at right
Referring more particularly to Figure 14 it is
understood that the top end of plunger B is pro
mechanism of the press; the combination with a 55
I by cap screws l6 through ?ange ll of said hous
ing, and it is seen that said flange‘ is adapted to
conform substantially to said enlargement.
Apertures !8 are’ provided in ?ange II for the
angles thereto so as to receive a lever of the trip
vided with a shoulder as at i9 so as to receive
pair of studs passing through said bracket and
and retain the lower end of spring 29, and the
engaging the frame of the press, each of said
upper end of said spring bears against floating ' studs having a sleeve thereon and a spring upon
disc 2|. Screw 22 is provided and is adapted to said sleeve, and means upon each side of the
60 threadedly engage housing 14 where shown, ‘with. 'aforesaid'lower enlargement of said bracket for 60
clearing the springs aforesaid.
lock nut 23 as indicated.
The object of spring 2b is to provide the re
quired pressure downwardly upon plunger B to
substitute the weight previously explained, and
the tension of said spring is effected by screw 22.
All parts being inclose‘d’ in housing I4 spring’ 20
is thereby protected in a manner so as to perform
' its duty accurately at all'times.
rI‘he clutch operates in the following manner:
Engagement of the clutch is e?ected in the‘ or
dinary manner by moving roller 0 radially out'of
contact with cam M, whereupon springs N thrust
the clutch jaws into engagement. Upon the re
4. In a safety mechanism for a punch press
having a tiltable bracket and a plunger, a cap
for said plunger, said cap comprising a housing
and means for detachably securing said housing
to aforesaid mechanism directly over said plunger '
and in axial alignment with the same, a coil
spring freely disposed within said, housing, said
spring bearing upon the top of said plunger, the
upper end of the spring bearing against a ?oating 70
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