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Патент USA US2287630

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`Ivune 23, 1942.
K. MILLER
CLUTCH
Filed April 12. 1941
2,287,630
Patented June 23, 1942
2,287,630
UNITED STATES PATENT , OFFICE
2,287,630
CLUTCH
Kay Miller, Rockford, Ill., assìgnor to The Atwood
Vacuum Machine Company, Rockford, Ill., a
copartnershìp composed of Seth B. Atwood and
James T. Atwood
inmune-mn> April 12, 1941, serial No. 388,283
` iclaims.
Thisinvention relates to friction clutches and
is more particularly concerned with over-center
type clutches especially designed for tractors, al
though Suitable, of course, for other heavy duty
purposes.
The principal object of my invention is to
provide an over-center type clutch of simple,
economical, and practical design and construc
tion obtaining substantially constant engaging
pressure regardless of wear and operating satis
factorily with Afairly coarse and infrequent ad
justment.
The invention is illustrated in the accompany
ing drawing, in which
(01.»192-68) f
'
position'. The pressure plate 19a carries cir
cumferentially extending cam means 46a for
abutment with the finger portions 45 of clutch
actuating levers ‘lillaY which are pivoted, as at
4|, on ears v42 provided on a sheet metal ring
43al rotatably mounted on the back plate 20a
in concentric relation with the flywheel and
pressure plate.` In that way the proper rela
tionship is always assured between the fingers
45 on the intermediate pivot portions of the
levers 48a, and cam `means 46, such relationship
being important because the ring 43a, as will
presently appear, is arranged to be adjusted ro
tatively relative to the back plate to adjust
Fig. 1 is a longitudinal section through a 15 the fingers 45 of the levers relative to the in
clutch made in accordance with my invention,
clined helical cam surfaces 48 on the correlated
the same being shown in disengaged position, and
Fig. 2 is a fragmentary sectional detail illus
trating a variation in the construction of Fig, 1.
Similar reference numerals are applied to cor
responding parts in these two views.
arcuate segments 49 of the .circumferentially
extending cam means 46 to compensate for wear
on the clutch disk facings` I6.v The segments 49,
of which lthere happen to be six, one for each of
six levers 40a, are formed from straight strips
Referring ñrst to Fig. 1, the clutch shown is
of sheet metal bent to the desired arcuate shape
designed for application tothe usual lflywheel
and entered with a pressñt in the annular groove
on the crank-shaft of an engine. |2a‘is the
83 provided therefor‘inv the pressure plate `Illa
`driven shaft extending rearwardly from the fly
in concentric relation tothe shaft |2a. The ring
wheel and clutch into the gear box of the trans
43a is connected at a plurality of circumferen
mission in theusual way and supported at its
tially spaced points, as indicated at 84, with an
front end at the center of the flywheel. |4a
other sheet metal ring 85, which has an outer
is the clutch disk, the center hub |5 of which
annular >flange 86 for reinforcement thereof and
is splined on the front end of the shaft |211 to 30 a concentricinner annular flange 8l, by means
transmit drive from the flywheel to the shaft
of which the ring 85 is supported for rotary ad
when the clutch is engaged. The usual pads or
justment in the circular opening 88 in the back
facings lI6 `on‘ the clutch disk are engageable
plate 20a in concentric relation to the shaft
with the driving face on the flywheel and the
. Iza, The edge of the ñange 81 is notched, as
companion driving face i8 on the pressure plate 35 indicated at 53, to facilitate rotary adjustment
I'Sa. The latter is suitably cast like the flywheel,
of the rings 43a and 85. The gear 55a which
the face i8 being accurately machined to insure
meshes with the notched edge 53 of the flange
smooth clutch engagement. The back plate 20aI
81 is freely rotatable on thesmooth shank of
is also a casting and is arranged to be bolted at
the screw 56a, which is threaded in a hole in the
20’ tothe rim of the flywheel. Small rectangu 40 back plate, and when this screw is tightened the
lar plates 2l, ñtting in radial grooves `22 in the
gear is clamped so as to hold the ring 85 in
rim of the back plate, are secured in place by
adjusted position, and, of course, when the screw
rivets 23` and have a working fit in radial grooves
is loosened. the gear is free to turn to permit
2'4 in the rim portion of the pressure plate |9a
rotary adjustment of the ring 85. In that way
to drive the pressure plate with the flywheel,
the levers 4ta are arranged to be adjusted rela
while allowing axial movement of the pressure
tive to the c_am means 46a and held securely in
plate -relative to the ñywheel, as required in the
adjusted position. The rivets 84, by means of
engagement and disengagement of the clutch.
which the rings 85 and 43a are fastened to
Bolts 25 are entered freely through holes 2E in
gether, are shouldered, as indicated at 89, to
the plates 2| and threaded in holes 2`| in the 50 leave a clearance space, as indicated at 90, be
pressure plate to provide mountings for coiled
tween the rings, whereby to predetermine the
compression springs 28 acting between the plates
extent to which the preloaded Belleville spring
2| and the heads of the bolts 25, as shown, to
washer assemblies 18a, which are mounted in
urge the pressure plate normally away from the
circumferentially spaced relation between the
flywheel and clutch disk to retracted disengaged 65 rings 43d and 85 in a preloaded condition, may
2
2,287,630
be further compressed in the engagement of
the clutch. Each of these Belleville spring
washer assemblies consists of two spring wash
ers 'I9 and 80 with a spacer ring 8| therebetween
claims have been drawn to cover all legitimate
modifications and adaptations.
I claim:
1. In a friction clutch, the combination with a
held in centered relationhip with the washers
within the curled or flanged peripheries 82
flywheel constituting the driving element, and a
clutch disc constituting the driven element, of a
thereof. The rings 43a and 85 have small cy
lindrical bosses 9| struck therefrom, which fit
ing with the back plate and movable toward and
back plate for the flywheel, a pressure plate turn
away from the same in the disengagement and
freely in circular holes 92 in the centers of the
washers 'I9 and 80, so as to hold the washers 10 engagement of the clutch, respectively, a ring
mounted for rotary adjustment relative to the
against lateral or radial displacement with re
back plate, circumferentially extending cam
pect to the rings,
means on the pressure plate in concentric rela
The levers 40a project through slots 59 in the
tion with said ring, one or more elongated levers
ring 43a for pivotal connection, as at 60, with
toggle links 6 I, which, in turn, are pivotally con 15 extending in the general direction of the axis of
rotation of said clutch but radially spaced there
nected at 62 with lugs 63 on a throw-out collar
from, each pivoted intermediate its ends on said
54. The fiat surface 65 on the front of each lug
ring and having a radially projecting ñnger on
63 serves by engagement with the edge of the
the pivoted portion engaging the circumferen
inner flange Sla on the ring 43a to limit the for
ward movement of the throw-out collar in the 20 tially extending cam means, a counterweight on
one end of each of said levers, and means includ
engagement of the clutch when the pivots 62
ing toggle links pivotally connected with the
have moved past a plane through the pivots Bü
other end of said levers for oscillating the same
normal to the shaft l2a; in other words, when
to force the pressure plate away from the back
the toggle links 6| for operating the levers 4B
plate to engage the clutch, said levers being ad
have been moved “over center.” Each of the
justable with the ring circumferentially with re
levers 40a has an arm 65 extending forwardly
spect to the cam means.
from the pivot portion of the lever and en
2. In a friction clutch, the combination with a
larged at the outer end, as indicated at 6l, to
flywheel constituting the driving element, and a
serve as a counterweight, the centrifugal force
on which will balance the centrifugal force on 30 clutch disc constituting the driven element, of a
back plate for the flywheel, a pressure plate turn
the rear end portion of the lever and thus elim
ing with the back plate and movable toward and
inate that as a factor in the operation of the
away from the same in the disengagement and
clutch. The throw-out collar Ell is operable in
engagement of the clutch, respectively, a ring
the usual way by a conventional yoke or other
L. Ul mounted for rotary adjustment relative to the
clutch operating means.
In operation, it will be understood that the
back plate, circumferentially extending cam
Belleville spring washer assemblies 18a are pre
loaded to about 130 lbs. pressure and in the en
gagement of the clutch are arranged to be com
pressed further, to about 2‘60 lbs. pressure, so as
to exert that pressure on the clutch disk through
the pressure plate |9a so long as the clutch is
engaged. The clearances at 9D when the clutch
is disengaged are approximately .060" and in
the engagement of the clutch only a portion of
that clearance is absorbed-about .030”. Due to
the inherent low rate characteristic of the Belle-ville spring washers within the operating range,
means on the pressure plate in concentric relation
with said ring, one or more elongated levers ex
tending in the general Idirection of the axis of
rotation of said clutch but radially spaced there- '
from, each pivoted intermediate its ends on said
ring and having a radially projecting finger on the
pivoted portion engaging the circumferentially
extending cam means, a counterweight on one
end of each of said levers, means including toggle
links pivotally connected with the other end of
said levers for oscillating the same to force the
pressure plate away from the back plate to engage
the clutch, said levers being adjustable with the
there is very little decrease in the engaging pres sure due to wear of the clutch disk facings I6, 50 ring circumferentially with respect to the cam
means, and spring means supported on the back
andvit is also apparent that satisfactory opera
plate in preloaded condition and arranged to be
tion is obtainable with fairly coarse and infre
subjected to further compression by said ring in
quent adjustment. In the engagement of the
the engagement of the clutch whereby said
clutch, the forward movement of the throw-out
collar @4 is limited by engagement of the sur 55 springs exert increased pressure on the pressure
plate while the clutch is engaged.
faces 65 on the lugs 63 with the ñange 58a on
3. In a friction clutch, the combination with a
the ring 43a when the pivots 62 have moved past
flywheel constituting the driving element, and a
a plane through the pivots 6U normal to the
clutch disk constituting the driven element, of a
shaft IZa, namely, when the toggle links El for
operating the levers 4ta have been moved “over 60 back plate for the flywheel, a pressure plate turn
ing with the back plate and movable toward and
center.”
away from the same in the disengagement and
The clutch, a portion of which is illustrated in
engagement of the clutch, respectively, a ring
Fig. 2, is substantially identical with that of
mounted for rotary adjustment relative to the
Fig. 1 but has coiled compression springs 3M
back plate, circumferentially extending cam
provided between the rings 43a and 85, the
means on the pressure plate in concentric rela
ring 43a having cups 38a provided in holes 39
tion with said ring, one or more elongated levers
to accommodate the springs. The operation of
extending in the general direction of the axis of
this clutch is very similar to that just described
rotation of said clutch but radially spaced there
except for the fact that the coiled compression 70 from, each pivoted intermediate its ends on said
ring and having a radially projecting finger on
springs 36a have different characteristics from
the pivoted portion engaging the circumferen
the Belleville spring washers.
tially extending cam means, a counterweight on
It is believed the foregoing description con
one end of each of said levers, and means includ
veys a good understanding of the objects and
advantages of my invention. The appended 75 ing toggle links pivotally connected with the
3
2,287,630
other end of said levers for oscillating the same
from, each pivoted intermediate its ends on said
to force the pressure plate away from the back
ring and having a radially projecting linger on
plate to engage the clutch, and a throw-out co1
the pivoted portion engaging the circumferen
lar pivotally connected with the ends of said
tially extending cam means, a counterweight on
links remote from the levers and movable to
one end of each of said levers, means including
ward and away from engagement with the ring,
toggle links pivotally connected with the other
said ring limiting movement of the throw-out
end of said levers for oscillating the same to
collar when the toggle links have been moved
force the pressure plate away from the back
over center in the engagement of the clutch, said
plate to engage the clutch, and a throw-out co1
levers being adjustable with the ring circumfer 10, lar pivotally connected with the ends of said
entially with respect to the cam means.
links remote from the levers and movable to
4. In a friction clutch, the combination with
ward and away from engagement with the ring,
a flywheel constituting the driving element, and
said ring limiting movement of the throw-out
a clutch disk constituting the driven element, of
collar when the toggle links have been moved
a back plate for the flywheel, a pressure plate 15 over center in the engagement of the clutch, said
turning with the back plate and movable toward
levers being adjustable with the ring circumfer
and away from the same in the disengagement
entially with respect to the cam means, and
and engagement of the clutch, respectively, a
spring means supported on the back plate in
ring mounted for rotary adjustment relative to
preloaded condition and arranged to be sub
the back plate, circumferentially extending cam 20 jected to further compression by said ring in the
means on the pressure plate in concentric rela
tion with said ring, one or more elongated levers
extending in the general direction of the axis of
rotation of said clutch but radially spaced there
engagement of the clutch whereby said springs
exert increased pressure on the pressure plate
while the clutch is engaged.
KAY MILLER.
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