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Патент USA US2518495

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Aug- 15, 1950 i
, Filed Mm); 11. 1947
4
K. E. REESE .
SAFETY TRIP MECl-iANISll
_
2,518,492
2‘ sh'eetsb'sheet 1
* I Aug. 15,1950
‘
‘ K. E. REESE
,
2,518,492
SAFETY TRIP mgémmsu
Filed March 11,_194'Z'
2 Shéeis'éSheei 2
W22
I3H I WM
Patented Aug. 15, 1950
‘2,518,492
.UNITED » STATES
_
I‘
,
PATENT ‘ OFFICE
2,518,492
.
l I’ SAFETY TRIP MECHANISM‘
V
Kenneth'E. Reese, Elkhart, Ind.
Application March 11, 1947;‘Se1-ial No. 733,863
’ I
.
,.
(01.; ‘192-25) '
10 Claims.
l
'
This invention relates, in general, to punch
pres‘sesfand has particular relation‘ to an im
proved safety trip mechanism therefor.
“While ,Iihavereferred' to the invention as a
‘ 7 Another object of the invention is to provide
a device of the class described wherein excessive
wear is eliminated.
‘ Another object of the invention is to provide.
safety ‘trip mechanism for punch presses and
an improved 'form of safety trip mechanism 'in.
shall hereinafter,‘ in connection with the draw
ings,“ describe the" invention in that regard, it is
" which the ‘release member is pivoted for swing-
to be understood that thedevice of the present
invention may be employed‘ for‘ all similar pur
with respect to the axis of the crank shaft and,
about an axis parallel with the axis of the crank
poses; for example, wherever a safety trip mech
anism
is
desired.
a
'
'
'
~
'
. 1 shaft.
"
Prior‘devices of the s'ortwith which the present
invention is concerned usually embody a con
tinuously, rotating power member, such as a fly
wheel; a rotatable crank shaftfcooperating clutch
elements between the power member and the
crank shaft adapted to be moved into and out
.of‘ clutching engagement to cause intermittent
ing movement in a plane disposed transversely
"
Further “objects and advantages of the inven-j
tion'will appear from the following detailed ‘def
scription, taken in connection with the accom
panying drawings which illustrate the manner
of constructing and operating an illustrative em‘
‘ bodiment of the present invention.
In the drawings:
,
‘ ‘_
Figure. 1 is a fragmentary side elevational viewv
rotation of the crank shaft to be produced dur
of ‘ a safety trip mechanism embodying the pres-'
ing continuous rotation of the power member, 20 ent invention;
'
'
"
>
and a hand or foot lever for controlling engage
Figure 2 is a fragmentary vertical‘ sectional‘
ment‘of the clutch elements.
view taken substantially on the line 2-2 of’
- One of the main objects of ‘the present ‘inven
Figure l;
<
tion is to provide an improved safety trip mech
Figure 3 ‘is a, fragmentary vertical sectional
anism which will operate automatically as a 26 view taken substantially on the line 3-3 of
safety device to disengage the clutch elements ‘ Figure 1;
atthe end of each cycle of operation of thema
Figure 4 is a fragmentary detail elevation of
the end of the ratchet plate which has the ratchet‘
{Another object of the invention is ltoprovide
tooth or step for engagement with the cooperatan improved form of safety trip mechanism in 30 ing ratchet tooth or step on the release rod;
and ‘
which the release member, by travelling with the
Figure 5 is an end view ‘of the ratchet plate
driven clutch member at alltimes, does not have
to, depend on the drivenv clutch memberdropping
member.
5
chine.
..
.
.
.
.
..
back into‘ positionto retract it from the, ?ywheel
or other driving member as usual in the prior
conventional forms of safety trips.
Another object of the invention is to provide
ars‘afety trip mechanism having an additional
safety, feature operable in the event“ any part
Referring now to the drawings, the part shown
fragmentarily at I in Figure 2 may be the frame
cf the punch press or other machine or appara
tus with which the'safety trip mechanism of the
present invention is used. A horizontal crank‘
shaft 3 for the press is journaled in the frame
is“ sprung 'or broken to. cause belt slippage or 40 and has a driving wheel 4, such as a belt or motor
operated ?ywheel, pulley, gear or the like
mounted’ on the outer end of the shaft 3. The
stalling of the operating power, thereby avoid
ing possible accident and possible injury to the
operator.
Another object of the invention is to provide
flywheel 4 is normally free to rotate ‘ on ‘the
shaft 3.
j
>
_
a safety trip mechanism that may be set expedi 45 A driven, clutch block 5 is fixed on the shaft
tiously and with facility for either non-repeat or ‘ 3 for rotation therewith, for example, by a key,
continuous operation selectively 'as desired.
spline or the like indicated at 6. Brake means
Another object of the invention is to provide'
(not shown) is preferably provided as suitable
a device of the class described having various fea
or desired.
‘
tures of novelty and advantages, and which is 50 The hub of the ?ywheel 4 is con?ned between’
vparticularly characterized by its simplicity in
construction, its economy in manufacture, its
effectiveness in use, and the ease and assurance
with which it operates for the intended pur
posef
the block 5 and a suitable retaining member ‘I,
secured at 8, preferably detachably, to the outerv
endrof the shaft 3., The inner end of the hub‘
of the flywheel 4 has a plurality of driving clutch
55 elements, for example, in the " form of pins 94
2,518,492
4
3
tooth or step engagement at 3d. The release
lever I5 then drops out of the slot I8 in the bolt
I0 and the spring I3 forces the bolt ID to the
secured thereto with their inner ends adapted
for engagement with a driven clutch element,
for example, in the form of a bolt I6 carried
left, as the parts are shown in Figure 2, for em
for longitudinal sliding movement in the driven
gagement with the drive pins 9 on the ?ywheel 4.
clutch block 5. Four driving clutch elements
With the ?ywheel 4 in motion, the engagement
9, equispaced circumferentially about the hub of
of one of the pins 9 with the bolt It drives the
the ?ywheel, are shown in the drawings, but
crank shaft 3 in a counterclockwise direction
this may vary within the scope of the present
untilLa cam surface 35 on the block-5pby-engage
invention. ,The ‘driving clutch elements 9 are
shown of ‘cylindrical form with flat ‘surfaces ,‘II 10 ment with-‘a roller 35 *journ‘ale'd to turn on the
adjacent end of a release dog, forces the release
for engagement with the driven clutch element
l'rod 26 in a clockwise or backward direction about
or bolt IQ, but this, too, may vary.
its pivot 28.
The volt Ill, which is shown of generally rec-v ,
This releases the ratchet tooth or
tangular form in transverse section, iis'inio‘unted' step engagement at 34 between the release rod 26
for longitudinal sliding movement in ar'recess I172 15 and vvthe ratchet plate 2|, and the cam actuator
20 turns back to its vertical position (Figure 2)
of corresponding form in the block 5. V A coil
under the 'actioniof'the balance weight 29’.
spring l3, positioned within al'lreces's ‘in the 1bolt
The-cam actuator 20 has a radius on its outer
I0 and engaging at its outer end against'an abut
or back side which thenwomes into contact with
ment I4 secured to the block 5 operates when the
boltv IE} is released to force the bolt into ‘position 20 therelease lever I5 and ‘forces it upwardly from
idr engagement by one of the ‘pins "*9. ‘With the
?ywheeh? rotating in‘a‘coiinterclockwise‘ direction
its tame-a elin'apositio‘n to ‘its run line ‘position,
as shown by the arrow in Figure ‘:1,'one or ‘the
part. I ‘i of the 1ever i' 5 ‘erite‘rs‘the s'lot i3 and forces
(Figure 1"). Tn'swing‘ih‘g'iipwariily the angular
creeper theclu'tc‘h'pins Q-e'ngagesthe projecting
or cams "th‘e'bolt T0 out ‘of 'en'gagement‘with the
e‘n'd‘iif ‘thebolt I0‘ and drives or "rotates the ‘shaft 25 cooperating ‘drive .‘pin' '9. v""I'h'e release rro'd 26 ‘is
"The 'd'riv‘e'nblutch"element or bolt I0 is re‘
tractame from clutching‘ position by a release
brought 'back ‘to Iitsfiill line ‘position “from "its
dbtted?lill‘e .position as shown in Figure 1 "by “a
coil ‘spring i3I3~encircling _the ‘rod '24 ‘and inter
1ever15pivotedat It to ‘the?riven member or
posed'be'tweenarid acting ‘against abraoket :39‘
3 ‘withth'a?ywheel 4.
-
block}. ‘The lever I5 has a tapered or angular 80 which 'is'secured 'to'the “frame I, and an adjusting
part1? which, when'th'e lever is forced upwardly
froh?t‘s‘dotted‘line"position to its full linerposi
abu'tmentscollarvli? adjustable along therod T4.
The [proper :tension is obtained'by adjustment of
tian‘ajs'snown in Figure l," enters a'slot H3 in ‘the
thecollar do-up-anddown on the-rod 24. ‘The
b‘olt‘l‘fand, by cooperation with the ‘tapered ‘or
collar f 404s held in place after adjustment is
angular ‘side ‘I9 or "the ‘slot, ‘cams 'the'bolt It ‘out a 35 made‘b‘y SBll’SGI‘QWS 52 which lock against the
of engagementwi'th th'e cooperating drive pin‘S.
rod 24.
>
_
-.
The release lever I5, by travellingwith' the bolt
With the lfoot‘,..-pedal 3-I v‘released, the tension
I20 ' at all times, ‘does not have to depend (in ‘the,
of, ‘the-\spr-i-ng '38 -i's-~adapted tohforce the release
bolt "I0 “dropping back into position to retract » rod #26 in an upward direction until the ratchet
itfrom the ?ywheel as usual in the prior'c‘oriven 40 toothjori step' thereon is ‘brought into engagement
tiona'lfforms of 's'afety'trips. '
with the ratchet tooth :or 1step -on the :plate ~2I
by¢arguide "plunger *44. The plunger 414 has '-a
slot 135' w-hichi-?ts ther'sides ‘of the rod »2~6»and a
“For the purpose or swinging the ‘lever "r5 up?
wardly to retract the bolt Ill, a cam-actuator 2'9
is'c'arried by the adjacent-end ‘of a ratchetl'plate '- horizontal =sl'ot"46 :in which =a guide "pin 431 an
21. ‘The plate 2I‘is splined or'keyed, ‘for example, 45 choredlin afguide pin housing ‘48 engages. Pres
at 22aonv a shaft 23. This shaft 23 may ‘be suit
sure ‘to force ‘the :guide plunger 4'4 against'the "re
lease rod 26 is obtained by a coil spring 50 en
and vcam actuator 20 ‘may turn about the axis
gaged in the z'guidevzpin-ihousing 48. ‘ Proper ten
siomisiobtained'by adjustment "of a ‘screw 56' in
ablyéjournaled for ‘rotation so that the ‘plate '(ZI
of :the‘s‘haft. ‘The cam actuator 1it has a balance’
WeightVZIJ" which turns the cam actuator back 50 theiéguide pin ‘housing "48.
torits ventical position shown in full lines‘ in
"if-‘desired, =Spr-iii'g Ime'ans mayv be» provided ‘for
helping?toIforceT-the» 'r'e'lea'se lever 1P5 but of en'
to;-its dotted linelposition.
_
,
V
gagéme?tf'withitlfie slot ~18 in the {bolt 5H1 when the
epressing a trip rod :24 which works '_in
ratchet-"plate 2| —is»‘swun'g out from‘beheath ‘the
55
conjunction with a ‘trip arm 25(areleaserod'26 is
lever I5. An enample?'o'f this is shown 'i'n'the
pulled ‘downwardlytu'ff‘he armv 25 is shown rpiv-_
f'oriiné‘o'f a=coil ‘spring '53 mounted‘lin-E'a 'recess‘in
Figure *2’ following movement of the cam actuator
oted at one end: at 21 to the frame 'I_ ofj-the press
and,;a§t its opposite end,1at:28 tothe lower end of
the~release rod (26. ‘The trip rod; 2% is pivoted
ataits upper-endat '29 to the arm 25 between the
pivots Hand 28 and, at its lower end, for ex
amplez »at.-3Il to aqfoot pedal 3]. The pedal _3_I is
60
dog ‘g’lf‘and' its roller its inf ‘place, "the ‘crankshaft
adapted to be engaged and depressed at its op
~:!I“he4-relea'se rod 26 has a ratchet tooth or step
which engages at 34 with av-ratchet tooth or step
on ‘the ratchet plate 2I. With’the partsposi
tioned as shown in ‘full lines in Figures land ;2
shown iinl‘ll'igure lftheidog‘g‘l ‘may ‘be secured ‘in
place’on the ro'd‘26‘by ‘set screws ‘53, or ‘in any
other suitable or preferred manner. With ‘the
pivoted at one end at 32 to the frame I, and is
poslite end ati33 bythe foot of theoperator.
trial-blocks? andiac'tiing against the lever ‘1T5.
-'fI’he {-r‘e'lea‘s'e ?og-‘3'1 ‘is ‘preferably ‘detachably
mounteaen the upper’ end-tithe rode-26. "As
65
nnerevolution’anu ‘stops. ‘It 'dO'K-JS lldt
repeat'untirthe "foot‘pedlail iai‘lnasmoved‘upwaraiy
andis again'depl‘ess‘e'd. ‘The devi'ce‘may‘bemade
topper‘ate 'continuouny'
' the Simple expedient
of removing the‘ jre‘l‘ea's'enog '31 'all'd herding ‘the
and the ratchetjteéth or steps in engagement at
3'4,ithe plate'2ll is swung from its full line posi
pedal 's‘l'or'irod‘zt ‘depressed. Other ‘cycles or
operation are ‘also contemplated withinthe scope
or'the‘broader ‘aspects of ‘thepr'esent invention.
the ‘trip rod 124 is depressed. V This is accom
jIn order to eliminate: excessive wear, the en
tion-t0
dotted line position (Figure ‘2-) when.
thecam actuator ‘Ill and the__
plished by turning >movementlimparrtedl-to; the‘, :gageme'nt'between
I5 is preferably accomplished
plate‘ 21 about the axis of ‘the shaft 23 by the 76 release lever
2,518,492.
6‘.
through’ a? roller.» 56; .This roller. ;56::.is ijournaled
adapted .by i its turning. ' movement .to force, said
for rotationat 51‘ on the: cam actuatori20 and' en-.:
gages the vbottom of‘ the ‘lever l5. w :The roller 3.6.
on the release dog. 31' also eliminates‘: excessive.
wearibetween 'thelca'ml'surface 35 and the non
clutch releasing member into cooperation-with
repeat mechanism.
_
t
_
saidzdriven vclutch means to'retract said driven
clutch means from engagement with said driving
clutch means, and an‘ abutment ‘on said clutch
releasing member for. engagement with said cam‘
'_
An additional safety feature of ‘the trip mecha
nism of the presentinvention is, accomplished by ‘
providing an extension, step or shoulder 60 on
the under .or back side of the release lever l5. In 10!
the event any part is sprung or broken, for ex
ample, through careless maintenance or operation
actuator to cause stalling of ltheiop'erating power.
in theevent any part is sprung or broken.
3.. In a mechanism of the class described,
combinatioma rotatable driving member, arotat
pbssibleinjury to the operator. This safety fea
able driven member, driving clutch meanson said
driving. member, driven clutch means carried by
saiddriven membena clutch releasing member
carried by? said driven member, a cam' actuator
mounted'for turning movement and adapted-by
its'tturn'ing movement to force said clutchreleas
ing member. into‘: cooperation with .‘said driven
ture' alsol'operates in the-event ‘the bolt 'lllfis
clutch’means' to retract said driven clutch means
this'step 601 will come into contact with the cam
actuator 20'at BI. This will‘cause beltlslippa'ge
on the ?ywheel-4 or stalling of the operating
power, thereby avoiding possible ‘jaccident' and
broken; which may be caused by overloading.1-'-»3
from engagement with said driving clutch means,
It is believed that the operation of the mech 20 a cam surface on said driven member, and means
including a part cooperable with said cam sur
anism shown and described will be apparent from‘
face and operable to release said cam actuator for
the foregoing description, and therefore the oper
turning movement in a direction to actuate said
ation will not be repeated in further detail. Suf
clutch releasing member to retract said driven
?ce it to emphasize that the mechanism may be
set expeditiously and with facility to operate either 25 clutch means.
4. Mechanism according to claim 3 wherein the
clutch releasing member has an abutment for en
gagement with said cam actuator to cause stall
ment in a plane disposed transversely with respect
ing of the operating power in the event any part
to the axis of the crank shaft and about an axis
parallel with the axis of the crankshaft. By 30 is sprung or broken.
_ 5. In mechanism of the class described, in com
travelling with the bolt 10 at all times, the lever
bination, a rotatable driving member, a rotatable
[5 does not have to depend on the bolt l0 drop~
driven member, driving clutch means on said
ping back into position to retract it from the ?y
driving member, driven clutch means carried by
wheel.
The embodiment of the invention shown in the 35 said driven member, a clutch releasing member
carried by said driven member and operable to
drawings is for illustrative purposes only, and
release said driven clutch means from said driv
it is to be expressly understood that such drawings
ing clutch means, a ratchet member mounted for
and the accompanying speci?cation are not to
turning movement and having a cam actuator
be construed as a de?nition of the limits or scope
of the invention, reference being had to the ap 40 movable by turning‘ movement of said ratchet
non-repeat or continuous, as desired. The release
lever is pivoted on the block 5 for swinging move
pended claims for that purpose.
I claim:
,
member to position forcing said clutch releasing
member into cooperation with said driven clutch
means to retract said driven clutch means from
1. In mechanism of the class described, in com
engagement with said driving clutch means and
bination, a rotatable driving member, a rotatable
driven member, driving clutch means on said driv 45 to another position freeing said clutch releasing
member for engagement of said driven clutch
ing member, driven clutch means carried by said
means with said driving clutch means, a cam
driven member, means urging said driven clutch
surface on said driven member, a release mem
means into engagement with said driving clutch
ber having swinging and generally endwise move
means, a clutch releasing member carried by said
‘ driven member and operable to release said driven 50 ment, toothed engagement between said release
member and said ratchet member for turning said
clutch means from said driving clutch means,
cam actuator to released position by generally
said clutch releasing member comprising a lever
endwise movement of said release member, and
pivoted to said driven member for swinging move
means on said release member cooperating with
ment about an axis parallel with the axis of the
driven member and in a plane disposed trans 55 the cam surface on the driven member and op
erable to swing said release member to disen
versely with respect to said driven clutch means,
gage the toothed engagement between the re
and a cam actuator mounted for turning move
lease member and the ratchet member for ac
ment and adapted by its turning movement to
tuation of the driven clutch means to released
force said clutch releasing member into coopera
tion with said driven clutch means to retract 60 position at the end of a cycle of operation.
6. Mechanism according to claim 5 wherein a
said driven'clutch means from engagement with
foot pedal is connected to impart generally end
said driving clutch means, said cam actuator hav
wise movement to said release member and a
ing a balance weight for turning it in a direction
to retract said driven clutch means from engage
ment with said driving clutch means.
7 guide plunger cooperates with said release mem
65 ber to bring the tooth on the release member into
engagement with the tooth on the ratchet mem
2. In mechanism of the class described, in com
ber when the foot pedal is released.
bination, a rotatable driving member, a rotatable
7. Mechanism according to claim 5 wherein
driven member, driving clutch means on said driv
said clutch releasing member has an abutment
ing member, driven clutch means carried by said
driven member, means urging said driven clutch 70 for engagement with said cam actuator to cause
stalling of the operating power in the event any
means into engagement with said driving clutch
part is sprung or broken.
means, a clutch releasing member carried by said
driven member and operable to release said driven
8. Mechanism according to claim 5 wherein
clutch means from said driving clutch means, a,
said cam actuator has a balance weight for turn
cam actuator mounted for turning movement and 75 ing it to position to retract said driven clutch
7
mm :from engagement‘ with 58911‘! idrlvi?géclutch
means.
a :guide plunger cooperates :yieldingly ‘with said
-
mechanism aofnthe elaes described, .invcom;
binaztion, zatmtatable driving member, ‘alrotatable‘
driven member‘, ‘a longitudinally shiftable- :‘bolt
foradrivmglyzconnectingsaid rmembers, means afar‘
actuating said bolt ito released position and 111-.
ciuding a ratchet member mounted for atummg
'mnvemente :release member mounted :for swing
in: :movement and ‘generally aendwise movement 'm.
and adapted ‘for 'P'Bo‘othed. engagement 'withmsaid,
ratchet member, manually 'operable imeans con-1.
neeted $0 ~'impa;nt;general1y1endwise 'movementizto
saidmeleasemembeniazcamsurfaeeoncsaid driven.
member,- and \means ‘on :said xrelease member sand. 15'
cooperating with said ream surface ‘for .-<imparb
mg :ewinging :m'nvement to :said release member
tn :‘fnee itgirom utoothed vengagement“,with said
ratchet‘member.
8
'40‘ J-rMec‘hanismra'ccording to claim. 9 wherein;
.
v
release member to bring :it into .:,tuothed ‘ engage-v
meat with :the :ratehet :member.
.
,,
',
'
KENNETH E. REESE.
REFERENCES CITED
‘The fiollowing references are .of record in the
?le 61 this patent:
UNITED STATES PATENTS
Number
Name
.
Date
910,609
{945565
Trog ‘.1 ______ __.-____ Jan. 26, 1909
Marshall ._ ________ __ Jan. 4, 191,0,
-.9\'Z8;351
.~1,'2~11,>l43
vBergman ________ __ Dec. 13, 71910.
Gmthey _________ _- Jan. 2,191’!
2,204,421
Loshbough ______ __--_=June 1'11, 119401
23137596
2,365,093
Munschauer ______ .._ Oct. -8, 19405
Meyer.‘ ____________ __ Dec-.12, .1944
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