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Патент USA US2405582

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_ Aug. 13, 1946.,
l ¿405,52
Filed MarchB, 41944 -
2 Sheets-Sheet 1
Aug. 13, 1946..
Filed March s, 1944
‘ 2- sheets-sheet 2
Patented Aug. 13,1946
Harry A. Knox, Washington, D. C.
Application March 8, 1944, Serial No. 525,511
17 Claims. l (Cl. 192-68)
(Granted under the act of March V3, 1883, asV
amended April 30, 1928; 370 O. G. 757)
The invention described herein may be manu
factured and used by or for the Goverment for
current war. The enlargement of springs in
usual locations to alîord the necessary clutch
governmental purposes without the payment to
pressure, and the multiplication of discs and
me of any royalty thereon.
clutch surfaces have reached boundaries of prac
The invention relates to power transmission CIS t-icability, without a satisfactory solution of the
clutches, and has for an object to effect improve
problem. The use of more than one disc is ob
ment in a disc clutch operated through an axially
jectionable because of the greater longitudinal
slidable throwout member.
space required and also the added machine cp
The invention aims specially to improve con
erations, fitting and assembly operations, and
nections between a sliding sleeve and a presser 10 added materials. Sliding and keying or splin
plate on a rotative member whereby friction ele
ing of the multiple discs on both driving and
ments of respective rotating members may be
driven members is a serious objection. The
cl-amped together to form the clutch connection.
greater pressures required where a single disc is
A further important purpose is to offer an
employed of moderate diameter has been an in
improved construction for operating the presser
plate to attain high clutching eii'iciency within
a moderate space.
surmountable difficulty, where the limitations of
space, economy in material and reasonable ease
of assembly are satisfied; and it is one >of the
most important motives in this invention to en
vention to present novel means for amplifying
able the production of a single disc clutch and
the force applied through a spring element while 20 an amply adequate pressure applying means to
involving only a moderate extent of movement
clamp the disc to relatively rotating parts so as
of the spring element.
to transmit the high torque involved in tank
It is well appreciated that one of the most im
power plants, and at the same time gain marked
portant objects in clutches for power transmis
advantages and improvement in compactness,
sions between internal combustion motors and 25 eñiciency, economy of manufacture and ease of
final drive in motor vehicles is economy of space,
operation and repair.
especially longitudinally of the axis of rotation
It is a special aim of the invention to provide
of the driving and driven members, or longitudi
for a liberal clearance of opposed clutch faces
nally of the axes of the gearing of speed-chang
at the same time that a high pressure spring
ing transmission; and ordinarily all of the axes 30 action is provided for, enabling operation of the
indicated are laid in the same direction, making
device by a foot pedal with moderate effort, yet
the reduction of space required for the clutch
using a small and compact readily assembled
still more important.
spring device.
In the production of military material there
A specific end in view is to present a novel
are several factors making this attainment para 35 assembly of clutch operating connection of high
mount. First, all possible space is desired with
leverage value so constructed and arranged as to
in the length of the Vehicle for many auxiliaries,
be affected in a minimum degree by centrifugal
second, the running gear is in many cases short
coupled, and to this is often added a four-wheel
Another important attainment is the presenta
drive making further requirement for such 40 tion of a' construction having the foregoing ad
It is a specially important object of the in
economy of space.
Recently the use of radial airplane-type mo
tors, especially in tanks, has put a further pre
mium on space, because of the size of these mo
vantages, yet which is adapted to be produced
with a minimum of difficulty in manufacture,
and assembled manually with few fastening de
vices, and a minimum requirement for the use
tors, and in tanks, the limitations imposed 45
of tools.
encompass as small a space therewith as possible
It is a further object to añord a novel toggle
construction and operating means therefor en
by the use of armor (making it necessary to
and yet protect the power plant, driver and
abling the application of the high pressures to
large crew) and the multiplication of gun units
the clutch which may be expected from the use
radio equipment and other elements have put a 50 of such a device 'in a simple and rugged con
barrier in the way of amplifying conventional
struction yet one light in weight compared to
clutch designs to carry the prodigious loads in
the proportions of conventional clutch construc
volved by the great mass of these vehicles and
tion and the high degree of force transmitted.
the greatly enlarged power output required to
A further important attainment in view is to
move them at the high speeds demanded in the 55 enable ready access to all parts of the clutch op
erating connections for replacement or repair
working upon the hub I5 closely adjacent the
with a good working space therearound for
base of the base plate I5. The bore of the driven
hub is reduced rearwardly of the hub i6 in aline
ment with the nut I8, a roller bearing assembly
21 being fitted between the nut and driven hub
at this part. The motor shaft terminates at the
nut in this instance permitting a further sub
stantial reduction in diameter of the hub 25 as
at 28 where it is extended as a hollow splined
manipulation of convenient tools.
It is also sought to oiïer a construction which
will have great value for production in smaller
sizes, for incorporation in small passenger cars
and trucks.
Additional objects, advantages and features of
invention reside in the construction, ar
rangement and combination of parts involved inH
the embodiment of the invention, as will appear
or be understood from the following description
. coupling hub, a grease injection hole 29 being
provided therethrough for conventional grease or
oil supply fittings. Immediately adjacent the end
Y or the hub lâ a radial port 30 is formed through
and accompanying drawings, wherein:
the hub 2E for passage of lubricant from within
Fig. 1 is a section elevation of the rear side of
a clutch constructed in accordance with my in-
the hub to a throwout sleeve felt to be described.
A concentric annular recess 3l is formed in
the forward face of the disc near its axial bore,
Fig. 2 is a vertical section on the line 2--2 of
the inner side» thereof having an overhang 32 to
throw off lubricant escaping from the bearing 26
and the base plate I5 has an inwardly inclined
annular rib. 33 extended rearwardly into there
cess 31, forming a gutter 34 to receive lubricant
thrown oli by the overhang 32, drain holes 3.5.
leading from the bottom ofv the. gutter forward
through the plate l5 and inclined away fromy the
shaft, so. as to discharge oil forwardly from; the
Fig. 1;
Fig. 3 is a fragmentary section on the line 3-3
of Fig. l;
Fig". 4 is a` fragmentary section on the line
#-4, of Fig. 1;
rl‘he Figures 1 _and 2V are drawn approximately
onefhalf of the full size of apparatusheretofore
constructed.. for tank “Se
Reierring. to the drawings, there is shown. the,
rear, extremity of. a motor shaft lil, or prime
mover, haying a tapered. conical portion ll a
A presser plate 35 is mounted rearwardly of the
disc for translative axial> movement toward and
away from the disc and base plate. This presser
plate consists of a thick planiform annular body
coextensive with the zone 24 of the disc and
having a medial concentric stiffening rib 3_1, and
four radial support lugs 3B. spaced to aline with
distance forwardly, ending rearwardly ata cylinf.
drical part l2 which extends over a substantial
distance rearwardly from the part ll, a splined
part I3., and. a. relieved tenori t4 is formed on the
extremity of the shaft, the outer or rear part
which isexternally threaded to. receive a forcing
mit. llito be referredto.
A. Dlaníform circular clutch base plate i5 is
provided, constituting the driving member of the
the lugs 26 respectively. The lugs 2l! and 38 each
includes an angle of about 30 degrees, so as t0`
each receive therethrough three heavy assembly
and presser plate centering bolts 3,9 securing
clutch and having a hubY I6 bored and splined
brackets ¿lil vto the rear facesof the lugs 2n. The
to fitthe splined cylindrical part 1.3, of the shaft,
with a forward _flare lâ’ fitting the tapered. part 40 brackets project inwardly behind the presser
plate and are also inclined longitudinally rear
I_l. 0f the shaft. The hub. stops short of the»
ward. At their inner and. rearward parts they2
threaded part of the, tenori and; is. conically re-Í
are formed with integral radially bored and split
lieved interiorly to receive a wedgecollar I1 slide
pin holding clamp collars 4i, in which are in
able on the forward smooth. part of the tenori
and fitted to the conical end of the bore in the 45 serted enlarged. cylindrical pin bodies ¿l2v exposed
at the outer sides of the collars and slotted for.
hub. It is pressed forward by a forcing nut i8
screwed onthe extremity of the tenon, whereby
rotation by a screw driver or other tool at times,
the> hub is. likewise forced. on tothe conical. part
as-will be explained» thev collars are splitat` theirv
outer- sides in a plane parallel' to that ofthe
ilv of~ the shaft lil, witha greater extent of sup-».
50 plate l5, and- the outer rearward spring arm ¿Lil
port longitudinally. than afforded by thering.
thus formed is extended and` apertured as usual
in such clamps, to receive therethrough a clamp
bolt 44, screwed into a corresponding threaded
hole in the body ofA the bracket under the arm.
55 The pin body 42 has an- eccentric pivot stud 45
‘I_‘henut .Ik is formed with.I an` externalA hard
cylindrical face. to.. serve as a rear bearing- for the
driven member as will be described. Theinut has
a. swivel connection with. the collar so- that un
screwing of thenut willdraw out the collar.
extended longitudinally thereof and inward onv a
The base plate is of- substantial mass so that
itmay serve as a flywheel, and includes-a` periph
eral cylindrical rearward extension or flangeA i9
concentric with the> shaft. It has» at its rear'edge
rad-ial axis, to receive one member- of a toggle
to be described.
Each of the bolts 35 is in threaded eng-age
a series of four equally spaced lugs 2B- projected 60 ment with the lug 2G thereat, but freely- revoluble
in the base of the bracket 40, and at its forward
inwardly toward the> shaft parallel to the plate
extremity is formed with a slightly reduced
smooth cylindrical guide pin portion 45 extended
forwardlybeyond the lug 20 and engaged snuglyV
A drivenv member 2l is» revolubl'e onY the hub
and nut, consisting of a circular~ disc 2-2 of a
radius less than that of theinner edges of the 65 andslidably through holes in the lugs 38 of the
presser plateV so as to support the latter'slidably.
lugs 2.0 so that it'may be moved axially into and
On the rear side of the presser plate there are
out of operative position. The disc has opposite
quadriradiate raised bearings Sii, extending part
facings 23 of suitable friction> material».
ly across t-he rear face of the presser plate and`
The disc body is planiform over an outer an
inwardly thereof a distance, the plate having
nular zone 24 and throughout on its forward sur
corresponding inward strengthening extensions
face, but is progressively thickened from the
4_1 thereunder, these stop outwardly of the hub
The disc has an integral rearwardly» extended
hub 25, its interior bore being~ relieved at the
forward» end-to» accommodate roller bearings 28>
substantially of rib portions radially'bored to
zone 24 inwardly in a rearward direction.
25 a substantial'distance. The bearings consist
form a semicylindrical bearing surface 48; a slot'
49'being formed through one side throughout the’
abler inwardly freely when the shaft is away from
length of the bore. One side 5I of the slot 49
its bearing. A U-shaped yoke 10 has its arms 1|
in a clockwise direction is tangent to the bearing
apertured and engaged revolubly on the stud 61.
face 48 and in a plane parallel to the axis of the
The head l2 of this yoke is apertured to fit slidably
hub while the opposite side 52 of the slot is paral Ul around the rod, and the latter has a threaded
lel to the side 5l and located approximately 215
tenon at its extremity between the arms of the
degrees from the radius of the tangent mentioned,
yoke, on which a square nut 'I3 is screwed, ñtted
so that the clearance in the mouth of the slot is
snugly between the arms 'H by which it is held
correspondingly and substantially less than the
against rotation on the rod after assembly. The
diametrical measurement of the bore.
nut constitutes a limiting means to the rearward
A crank shaft 53 is provided fitted revolubly in
movement of the yoke head 1I on the rod, and
the bearing and extending beyond each end there
may be adjusted if desired by unscrewing and re
of. This shaft is formed with a flat 54 through
moving the stud 6T then rotating the yoke and nut
out its length parallel to the axis of the shaft and
together in the proper direction.
subtending an angle of approximately 90 degrees 15
The head 69 affords a shoulder 'M around the
more or lless on the cylindrical surface of the
rod next the wrist 59, and between this shoulder
shaft. As a result the measurement on a line
and the head of the yoke 10 a multiplicity of
normal to the face 54 through the axis of the
Belleville spring washers 'l5 are confined, slid
shaft to its periphery is less than the width of
ably engaged on the rod and arranged in pairs
the slot and when the shaft is presented at the 20 with their concave faces opposed. These washers
slot parallel to the bearing and with the ñat ad
are in such number that when the throwout sleeve
jacent the side 52 the shaft may be moved lat
is at its rear limit the washers are moderately
erally through the slot to a `bearing in the bore.
confined, and when the sleeve is forward to dead
When then rotated to its approximate operative
center relation as in Fig. l the washers are com
position as in Fig. 3, with the flat 55 extended
pressed to a desired maximum. The full extent
across the slot, the shaft is retained firmly in
of this movement need not be more than one
place. The principal loads communicated to- the
eighth inch in a heavy duty clutch, although this
shaft are sustained by the inner part of the bear
may be increased by decreasing the number of
ing and near the side 52 of the slot. The shaft
washers and properly proportioning the latter to
is formed with two integral upper and lower arms
give the desired maximum pressureforce .under
or levers 55-55 of short radius, each on the same
the extent of compression involved when the link
radial' plane of thev shaft, extending obliquely
age is in dead center position.
across the plane of the flat 54. The upper arm 55
With the linkage between the throwout sîleeve
is formed with an enlarged base 51, providing a
and crank shaft in dead center position and the
‘ shoulder 58 resting against the inner end of the 35 presser plate 3S fully engaged against the disc
bearing 50.
and facing, the member 42 is preferably so ad
The upper crank arm is provided with a wrist
¿usted initially that the link lever SI and crank
pin 59 fixed thereon and extended upwardly on
lever 55 are. short of dead center position to the
an axis parallel to the projected axis of the shaft
extent of between live and ten degrees of an
53, while the lower arm 55 is provided with a
gular movement on their axes. 'I‘his allows for:
similar pin 6D, also extended upward, that is, to
a considerable further operation of the toggle
ward the clutch axis.
linkage when the facings become somewhat worn,
' A compression toggle lever link 6I is fitted on
by expansion or extension of the linkage through
the stud 45 (retained by washer and cotter Eil’)
action of the Belleville washers, which, while the
and wrist pin E5, and the aggregate of the radii
parts remain in dead center relation will never
of the arm 55 and link 6l is greater than the
theless effect a further thrust upon the inner
distance between the axes of the shaft 53 and
crank arm 55, so as to operate the‘toggle through
stud 45.. This last named distance is variable
a further movement than initially set for. Also,
by rotating the pin body 42, .when the clamp 4l
at dead center position of the linkage to the
is `released, throwing the stud 45 toward or from 50 sleeve, and initial adjustment of the togglel de
thepresser plate. It is apparent that the arm
vice, the crank arm 55 is somewhat inclined at
5`5'and link 6I are capable of functioning as toggle
its outer part toward the axis of the sleeve.
levers by movement toward their dead center rela
In order to support the sliding junction of the
yoke 10 and rod E8, the nuts 'i3 are each pro
‘ On the hub 25 there is slidable a throwout 55 vided with longitudinally extended rest arms 16
sleeve 62 at the rear end of which a channel B3
at opposite sides, adjacent and against respec
is formed exteriorly, in which a throwout rin’g
tive arms 'il of the yoke. These arms are as wide
’54 is revoluble, operated conventionally by a usual
as the arms of the yoke and have longitudinal
yoke not shown to reciprocate the sleeve as de
guide slots 'H open through their outer ends and
sired. At its forward end four thrust arms 65 are 60 receiving the body portion of the stud 6'! therein
formed or mounted on the sleeve extending nearly
for rotationwhen the stud is screwed or un
tangent to the sleeve in a counterclockwise Edi
screwed, but, more important for sliding move
rection and formed with respective knuckles 55
ment of the stud in the slots as the yoke 'lf3 com
in which there are ñxed respective pivot bolt studs
presses the washers 'I5 or withdraws oppositely
'il> on axes parallel to the respective shafts 53 65 on the rod 68. When the washers expand the
.nextY to the bases of the arms 65. A thrust link
outer end of the rod is thus supported slidingly
connection is formed between the studs 6'! and
on the stud independently of the yoke lil, pre
respective adjacent wrist pins 59, so proportioned
venting binding or excessive wear of the latter
vthat at the forward position of the sleeve 62, the
against the rod.
wrist pin and stud may lie in the same plane 70
In the use of this construction, the toggle de
normal to the axis of the sleeve-in other words,
vice will be considered broadly as including con
in dead center relation. The linkage in the pres
necting portions 45-56-55--6L the linkage 61
ent instance consists of a rod 68 having a'trans
to 15, the shaft 53, and the crank 55. The'mech
versely bored head B9 receiving the wrist pin 59
anism being assembled as described, the released
sliidably'and revolubly therethrough and remov 75 position of the parts will be substantially as indi
cated in dotted lines in Fig. 4. The Belleville
washer unit or linkage will be fully extended so
that. the head 12 of the yoke 1G wil be pressed
against the nut 13, and the stud 61 will be at the
rear limit of its movement, in full size about one
and three quarter inches from dead center posi
wrist B0, so as to permit the latter‘to be swung'to
position for clearing the shaft from the bearing.
While I have disclosed this invention with par
ticularity in its best construction knownl to me,
it will nevertheless be understood thatÍ this. is
purely exemplary, and that changes in construc
tion, arrangement and combination of parts, sub
tion. The inner crank arm 55 will be inclined
stitution of materials, and equivalents mechani
inwardly toward the axis ofthe sleeve to a maxi
cal and otherwise, may be made therein Without
mum and the toggle device portion ¿l5-55-60
departing from the spirit of the invention as set
Bi will be broken from dead center position fur
forth in the appended claims, wherein I claim:
ther than shown in Fig. 3 to the extent. involved
l. in a clutch of the character described, a
by the dotted position of the inner crank arm
rotary driving member and a coaxial rotary
55 in> relation to its full line position in Fig. 4.
driven member on a main axis axially movable
This position of the toggle will have resulted in
toward and away from the driving member, an
drawing the shaft 53 rearwardly and with it the
axially movable presser plate ñxed angularly with
presser plate 36, slidingly on the stud ends 46
the driving member, a toggle device having one
of the bolts 39, and freeing the disc 22.
member element based on the presser plate and
On operation of the pedal or other levers cus
the other on the driving member on toggle axes
tomarily employed to operate the sleeve, the lat
substantially radial to the main axis, one mem
ter is moved slidingly forward, applying pressure
:ber element thereof having an operating rocker
throughout the linkage 81 to 15 to the crank
arms 55 so as to move these outward and swing
shaft extended inwardly to an are- of' rotation
ing the toggle device portion 56-6û-6i toward
on` said main axis lof less radius than that of
the toggle and having a crank at its inner part,
dead center position. In the early part of this
operation, relatively small opposition to compres
a slide axially movable on and angularly fixed
with the driving member, and a linkage con
sion will be manifest and the movement will re
quire only moderate force despite the low advan
nected between the slide and crank at an angle
tage in the leverage involved. As the resistance
to the latter and at an angle to the path of rela
of the washers increases so does the advantage
tive axial movement of its connection with the
in leverage, so that moderate effort will still effect 30 slide, and means to operate the slide,
the movement required under increasing pres
A2. The structure of claim 1 in which said link
sure applied at the clutch faces. The operation
age is constructed and mounted on said slide for
of the clutch pedal as last described may be by
movement relatively thereto in a plane parallel
spring action or manual, and may include means
to the said main axis.
`to limit forward. movement 1 of the throwout
sleeve, as in my Patent Number 2,380,971, issued
3. The structure of claim 1 in which said link
age is constructed and connected to said slide
August .7, 1945.
at a, distance radially outward from said main
Among the advantages of my invention in ad
axis adjacent the radius of the arc of rotation of
dition to those first mentioned, are the small
the crank around the main axis and spaced an
number of fastenings such as pins and nuts or 40 gularly from the crank in relation to said main
screw threaded or other fastenings of or between
axis a distance equal to the length of the linkage,
operative parts requiring tools or tooling in as
whereby a dead center leverage may be applied
sembly, or disassembly of the mechanism. Thus,
with a minimum of elements o-f centrifugal force
centrifugal force will hold the link lever 6| in
operative position so that only a small cotter pin
ëi. The structure of claim 1 in which said shaftv
BI’ is sufficient, required only during assembly
is radial, and the plane of operation of the tog
and when the parts are at rest. Likewise the con
gle is tangent to the path of translative motion
nection of the linkage with the wrist 59 requires
of the toggle around the said main axis.V
no fastening at all, the clearance between the
5. The structure of claim 1 in which said shaft
wrist and sleeve being insuflicient for detach 50 is radial, said toggle having its outer pivots> on
ment of the head 59, and the latter being thrust
axes radial to said main axis, means to adjust the
spacing of said pivots, said crank being movable
home on the wrist by centrifugal force during
with said shaft over a path having its mean ad
operation. The assembly and disassembly o-f the
jacent a radialplane of said main axis and said
extensiblelinkage also may be effected manually
without a fixed fastening, the nut 'i3 being un 55 linkage is of aV length to lie on dead center be
tween its connection with the sleeve and the
screWab-le Lby rotating the yoke» 'lil after dismount
ing, The shaft 53 is removable without Vtools
6. The structure of claim 1 in which a bearing
after dismounting the linkage from the stud Bl,
by extracting the Cotter pin 6i', litfing off the
for said shaft is formed on said presser member
link 6I, and after rotating the shaft clockwise 60 at its rearv side, the said bearing having a longi
as viewed in Fig. 3 to `bring the flat 5G parallel
tudinal slot whose diameter is of a width less
than the diameter of said bearing opening there
to the tangent side 5| of the bearing slot beside
from toward the rear,V one side of said slot being
the shaft. At this last named position of the
shaft the linkage may be lifted from the inner
wrist 59, manually. The linkage may be disas
sembled and assembled manually, since the range
of movement of the nut i5 on the threaded ten
oned end of the rod is sufficient to relieve the
discs of compression in outward direction and to
effect full compression of the discs when screwed
inward to the operative position of the nut previ
ously described. The wall of the bearing 50 is
exteriorly relieved (as shown in Figure 3') at one
side at itsouter end, adjacent the side 52 of the
bearing slot, in line with the path of the outer
tangent to the said bearing, the said shaft hav
ing a ñat‘ disposed normally across the said slot,
the transverse dimension of the shaft on a line
through its axis normal' to the said flat being less
that the width of the slot.
7. The structure of claim l in which the press
er plate has a bearing for said shaft extending
generally radially, said shaft being revoluble
therein and having a shoulder at its inner part
against the bearing to transmit thereto centrif
ugal force evolved on rotation ofthe shaft trans
latively aroundv said main axis, a wristv pin'
mounted in said crank and extending toward
said main axis, said linkage including a terminal
member set slidably and revolubly on the wrist
pin and having an applied position extending at
a tangent 'to the path of said wrist around said
main axis, said slide having an offset bearing for
l2. The structure of claim 11 in which means
is ,included to adjust the pivot of said toggle link
on the bracket toward and away from the driv
ing plate, and in which said last named link is
extensible, and elastic expansive means coact
between the end portion of the link to main
the outer end of the linkage.
tain a predetermined transmission of pressure
8. A linkage for the uses described consisting
between the slide and said crank.
of a pressure transmitting member, a pressure
13. The construction in claim i2 wherein the
applying member having angular limited con
last named link includes a rod having a head
vergent movement in relation thereto a link rod 10 revolubly mounted on the crank, a U-shaped
pivoted on the transmitting member, a pivot
yoke having an apertured head slidable on the
yoke on the pressure applying member and slid
rod, a stud on the respective thrust arm engaged
able on the rod, a nut having threaded engage
through the arms of the yoke the rod having a
ment with the extremity of the rod outwardly of
threaded extremity' extended between said arms
the yoke to limit outward movement of the yoke
of the yoke a nut screwed on the rod and held
on the rod, and a multiplicityof Belleville wash
between the arms, and aprotractile spring de
ers carried by said rod between said yoke and
vice engaged loosely around the rod and conñned
said transmitting member and adapted to trans
between the heads or the rod and yoke.
mit the pressure applied by Said pressure apply
14. A clutch comprising clutch members rela
ing member from said yoke to said transmitting 20 tively revoluble on a main axis, a toggle device,
9. The structure of claim 8 in which said yoke
an element of which is mounted on one clutch
member, and having pushing connection with
the other and having its members pivoted on
approximately radial with respect tc said
proportioned so that at the pressure applying 25 main axis, an eccentric linked to the toggle for
has parts extending in close iitting engagement
with said nut and beyond, and the whole being
limit of movement of the pressure applying
adjustment of the same, a throwout member
member said yoke will be clear of the nut.
slidable relative to and fixed angularly relative
l0. In a clutch a rotating driving plate, a con
to the toggle on said main axis, a pivot member
centric rotatable driven member of less diame
on and ñxed axially with the throwo-ut member
ter, an axially movable presser plate rearwardly 30 closely adjacent a tangent of the arc of move
of the driven member, the driving plate having
ment of the toggle device around said main axis
outer rearwardly extended parts and inwardly
and an elastic extensible shaft connected be
extended ears thereon, said presser plate having
tween the said eccentric and said pivot member
corresponding ears adapted to pass inwardly be
on the throwout and having a minimum length
tween the ñrst named ears under relative axial 35 equal to the distance between the eccentric and
translative movement of the presser plate and
pivot member when the throwout member is in
to lie in registry with the ñrst named ears with
position with the eccentric and pivot member in
in said rearwardly extended parts, brackets
a plane normal to said main axis, constituting a
mounted adjacent the first named ears, pressure
dead center relation.
transmitting means mounted upon said brackets
l5. The structure of claim 8 in which said
and engageable with the presser plate, and
yoke has parts extended beside said nut and be
headed bolt members having threaded engage
yond, the whole being proportioned so that at
ment in the ñrst named ears and slidable in the
the pressure applying limit of movement of the
brackets and through the second named ears in
pressure applying member said yoke will be off
supporting engagement therewith and having 45 bearing at the nut, said nut having a longitudi
their heads in clamping engagement against said
nal extension slidingly engaged with the pressure
applying member for support of the rod end.
11. In a clutch, a rotating driving plate, a
16. The structure of claim 1 in which an op
concentric rotatable driven member of less di
erating crank is formed on said rocker shaft, said
ameter, an axially movable concentric presser 50 linkage being pivoted on said slide and the end
plate ñxed angularly with the driving plate
of said crank, said pivot on the slide being angu
rearwardly of the driven member constructed to
larly spaced from the axis of the rocker shaft
clamp the driven member against the driving
around the axis of the clutch and said linkage
plate. said driving plate having rearwardly ex
being of a length to permit movement of the
tended parts, inwardly extended brackets there 55 slide to position both pivots of said linkage in a
on spaced rearwardly of the presser plate, radial
common plane normal to the main axis.
bearings adjacent said brackets, a shaft revol
17. The structure of claim l in which an op
uble in each said bearing having a rearwardly
erating crank is formed on said rocker shaft,
extended toggle arm, a toggle link pivoted on the
said linkage being pivoted on said slide and the
adjacent bracket and pivoted to the toggle arm, 60 end of said crank, said pivot on the slide being
a crank on the shaft inwardly of the toggle ex
angularly spaced from the axis of the rocker
tended in the same general direction as said tog
shaft around the axis of the clutch and said link
gle arm, a link extended therefrom having an
age being of a length to permit movement of the
operated position transverse to a radial plane
slide to position both pivots of said linkage in a
of said driving plate, a coaxial slide axially mov 65 common plane normal to the main axis, said
able on the axis of the driving plate and a thrust
linkage being movable to and beyond a dead cen
arm for each last named link on the slide pivot
ter relation to its connections with the slide and
ally connected to the link and movable rearward
crank whereby radial components of force in
ly with the connected end of the link from said
the action kof the clutch are minimized.
operated position, and means to operate the slide.
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