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Патент USA US2405357

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6, 1
2,405,357
(5. T. JARRETT
FRICTION
CLUTCH
I
_ Filed Dec. 13, ‘1944
2 Sheets-Sheet 1
.INV NTOR.
’
:
7;;
AT'TO RNEY8
G. "r. JARRETT '
FRICTION CLUTCH’
Filed Dec. 13, 1944'
_
2,405,357
.
'
2 Sheets-Sheet 2
“J INVENTOR.“
/
@G /
ATTORNEYS
Patented Aug. 6, 1946
2,405,357
‘ii-UNITED. STATES PATENT OFFICE
FRICTION CLUTCH
q George '1‘. Jarrett, Syracuse, N. Y., assignor to
Lipe-Rollway Corporation, Syracuse, N. Y., a
corporation of New York
Application December 13, 1944, Serial No. 567,971
9 Claims. (Cl. 192—68)
1
2
This invention relates to friction clutches of
clutch levers between the throw-out collar l I and
the type used in automotive vehicles and embody
the pressure ring, these levers being here shown
ing clutch levers for transmitting the movement
as of the ?rst class fulcrumed short of their outer
of the throw-out collar to disengage the clutch
or resistance ends on the back plate and thrust
against powerful spring means holding the clutch 5 ing at their outer or resistance ends against
engaged, and has for its object a simpler and
shoulders'provided on the rearwardly extending
economical lever construction and arrangement
arms 9. These shoulders are here shown as the
‘by which the levers are readily assembled in the
rear walls of notches 13 in the inner sides there
clutch without pivot and fulcrum pins and bear
of toward the axis of the clutch.- I 4 designate
ings and anologous fastening devices, and also 10 fulcrums provided on the back plate to the in
an arrangement of springs for holding the levers ,
ward of- the arms 9._ These fulcrums are here
from displacement on’ their fulcrums, prevent
shown as projections on the back plate. More
ing vibration or rattling and also: causingthe
speci?cally, they are in the form of a bail or
levers to follow up automatically as the friction
flattened U-shaped in general form, withthe
faces of the clutch wear.
'
15 ends of the U formation secured to the back
The invention consists in the novel features I
plate and their intermediate portions constitut~
and in the combinations and constructions here
ing- fulcrums. The levers l2 are formed, with
inafter set forth and claimed.
,
transverse notches on- their sides toward the
In describing this invention, reference is had
back plate or the fulcrums for‘ receiving the ful
to the accompanying drawings in which like'char 20 Crums,'these notchesbeingof less width than the
acters designate corresponding partsin all the
width'of the levers and located midway between
the side edges of the‘ levers, so that when'the ful
Figure 1 is a sectional view taken on line I—-l,
crums are seated in the notches, the levers bear on
Figure 2.
> ~
'
the fulcrums‘on opposite sides of'the notches,‘ that
Figure 2 is a fragmentary rear elevation of 25 is,‘ beyond the-opposite ends of the notches.~ The
parts seen in Figure 1.
walls of the notches hold the "levers from radial
- - Figures 3- and 4 are detail fragmentary views
displacement when the levers are engaged ‘with
of- a modi?ed form of spring means for the
the fulcrums and at their outer or resistance ends
levers.
the rear- walls of the notches 13 on .the
Figures '5 andu? are views similar to Figures 80 with
rearwardly extending armsof the pressure lringn v’
vviews.
'
'
.
.
‘
.
’
i
3Hand-4, ofwa second modi?cation of the spring
means of this clutch.
>
-_.. Figures 7 and 8 are views similar to Figures 3
and-fl of a third modi?cation‘of-the'spring means
off-this
clutch.
-
~
-
I
>
'
'
l designates the driving member-of'a clutch,
which is, usually the‘ ?ywheel of the enginev of
I
Usually,,_each_lever is-bifurcateol at its'outer
end,gthebifurcations l2a extending astride the
lateral sides- of'the arms -9; _,,'I,‘he_levers_jl_2_» are
channel-shaped in cross' section and theful
5 crums I 4 are substantially the width of the chan:
nels, so thatwhen the levers are assembled on
the fulcrums, the side walls of the channels, co‘
acting with the ends of the fulcrums, hold the
the ‘vehicle mounted on the crankshaft ~2 of'the
engine. 3' designates the driven member, here
levers from lateral-displacement. The transverse
shown as a friction clutch plate having a hub- 4 40.
notches in the ‘levers are shown as formed .by
slidably splined on the clutch shaft 5. 6 is the
striking up opposing lugs l5 from the intermedi
back plate secured, as by screw bolts'l, to the rim
ate portion of the lever into positions at an-angle
of the ?ywheel I. '8 is the pressure ring usually
to the lever. ‘
having rearwardly extending arms S-extending
The levers, because of the lugs 15, are hung on
through openings in the back plate to the rear
is the fulcrums and would rattle and become dis
side of the‘ back plate. The pressure ring thrusts
against thedriven member 3 to press the same
against the ?ywheel I.
‘
>
The spring means for engaging the clutch is
here shown as an annular series of springs l I]
interposed between the back plate 6 and the pres
sure ring 8. II is the throw-out collar suitably
mounted to slide axially of the shaft 2 to engage
and disengage the clutch.
‘
I 2 are motion transmitting and multiplying»
placed therefrom by relative pivotal movement
about the resistance points at the outer ends of
the levers. In order to hold the levers from
displacement, due to shifting and pivotal move
50 vInent about the resistance points, that is, to hold
the levers from displacement from the fulcrums
l4, springs are provided having bearing on the
lovers, Asseen in Figure 1, the springs 16 are
vcarried at the rear ends of the arms 9, are‘ leaf
55 springs anchored to the rear ends of the'arms
2,405,357
'
9, as by screws II, and press at their inner ends
against the inner arms of the levers. The springs
I6 tend to hold the levers from displacement off
their fulcrums and also hold them from rattling
Also, the springs or the inner
and vibrating.
ends thereof have an automatic follow-up move
ment, as the friction faces on the driven member
3 of the clutch wear. The shift .oi the levers
under such wear is considerable. Also, the
springs tend to offset the centrifugal action of
the inner ends or arms of the levers and hold
them off the bearing lb of the throw-out collar,
when the clutch is engaged.
The bifurcations I2a at the outer ends of the
levers are so located and of'such length as to en
gage the back plate upon abnormal movement
of the pressure ring 8 under the springs ID (as
when the back plate, pressure ring, etc., are de
tached from the ?ywheel I), and cause the levers
to bind on the bearing points I3 and hence pre
Vis frictionally engages the pivot 14 under the
in?uence of the spring IGI and snubs the lever
from vibration.
In any form of the invention, the springs I6,
I50, I60 and I 6| hold the levers from displace
ment from the fulcrum on the back plate and
hold the levers from rattling. In all forms of
the invention, the clutch levers are formed with
transverse notches intermediate their side edges,
which receive the fulcrums on the back plate,
the fulcrums bearing on the levers beyond oppo~
site ends of the notches.
What I claim is:
1. In a clutch, the combination with driving
and driven members, a back plate having open
ings therein, a pressure ring rotatable with the
driving member and having arms extending
through the openings in the back plate, spring
means pressing the pressure ring against the
driven member to engage the clutch, a throw
out. collar operable to disengage the clutch
against the spring means and levers for trans
mitting‘ the motion of the throw-out collar to
duty.
the pressure ring; of the back plate being formed
In Figures 3 and 4, another form of spring is
used,. this consisting of a leaf I50 bent to pass 26 with projecting fulcrums and the pressure ring
with shoulders against which the levers thrust at
through the opening in the center of the lever or
their outer ends, the clutch levers being formed
the bottom of the notches therein, part way
with transverse notches intermediate of the side
around the fulcrum HI and to the rear of‘ the
edges of the levers on the side thereof towards
levers, and then into position to press against the
inner ends of the arms I2. In this construction, 30 the back plate, for receiving thev fulcrums and
the end portions of’ the fulcrums bearing on the
the intermediate portions of the fulcrums are
levers beyond the opposite ends of‘ the notches,
reduced to provide a space for the portions of
and spring means‘ urging the levers toward the
the spring I50 passing around the fulcrum. In
back plate to hold the levers on the iulcrums with
this form of the invention, no rivets or screws
the intermediate portions of the iulcrums in said
are necessary to hold the spring in assembled po
notches, the spring means coacting with the le
sition. The fulcrum is reduced usually by turn
vers eccentric to the fulcrums to also resist piv-'
ing down or forming a groove in the intermedi
otal and vibrating movement of the levers.
ate portion of the fulcrum, that is, the portion
2. In a clutch, the combination with driving
between the lugs I5.
and driven members, a back plate having open
In Figures 5 and 6, a di?erent form of spring
ings therein, a pressure ring rotatable with the
is shown, this consisting of‘ a spring I60 formed
driving member and having arms extending
from ?at stock to have an- intermediate loop I8,
through the openings in the back plate, spring
the spring pressing at its opposite ends against
means pressing the pressure ring against the
the inner-arm of the lever and'lat its upper end
againstlthe rear wall of the notch I3‘, it being 45 driven member to engage the clutch, a throw-out
collar operable to disengage the clutch against
here shown as anchored to the lower arm of
the spring means and levers for transmitting- the
the lever I2, as by rivets I9‘. "The upper arm of
motion of the throw-out collar to the pressure
this spring which vextends into the notch I3'pro
ring; of the back plate being fonned with pro
vides a hardened surface against which the upper
50 jecting fulcrums. and the pressure ring with
resistance end of the lever works.
shoulders against which the levers thrustiat their
In Figures ‘Tand 8', a spring ‘IN is shown, this
outer ends, the clutch levers being formed with
being formed up from a ?at plate with its in
transverse notches intermediate of the sideedges
termediate portion provided with a corrugation
of’ the levers on the ‘side thereof towards the
which causes the spring to act somewhat as a
spring washer. The opposite ends of the spring 55 back plate for receiving the fulcrums and the
end portions‘ of the fulcrums'bearing- on the le-'
thrust at 20 against/the inner arm of ‘the lever
vers'beyond the opposite ends of‘ the notches,
I2 without being anchored theretov and against
and spring means urging the levers toward the
the rear wall of the notch l3 providing a hard
back plate to hold the levers on the fulcrums with
bearing face for the resistance end of the lever
I2. The intermediate or bowed portion of the to the intermediate portions of the fulcrums in said
notches, the spring means coacting withlthe le
spring I6!‘ is anchored to the fulcrum M, as by a
vers eccentric to the fulcrums to also resist piv
U‘-shaped' clevis 2| extending betwen the lugs l5
otal and vibrating movement of the levers, the le
and around the pivot M, the arms of the clevis
vers being channel-shaped in general form with
extending through an opening 22 in the bowed
their channels toward the back plate and the
portion of the spring IBI . The ends of the arms
fulcrums extending into the channels substan
of the clevis have outwardly extending, lugs 23
tially the full width of the channels holding the
formed thereon, which interlock with the outer
levers from lateral displacement.
face of the bowed portion of the spring, when
3. In a clutch, the combination with driving
the spring is assembled on the clevis. The spring
is assembled on the clevis by pinching the arms 70 and driven members, a back plate having open
ings therein, a pressure ring rotatable with the
of the clevis together, then slipping the spring
driving member and‘ having arms extending
over the arms and releasing the arms so that
through
the openings in the back plate, spring
they expand, moving the shoulders 2‘3'into inter
means pressing the pressure ring against the
locking engagement with the bowed portion of
the spring. The intermediate portionof the cle 75 driven member to engage the clutch, a throw-out
vent unintentional displacement of the levers o?
the fulcrums I4, or‘ relieve the springs I6 of this
2,405,357
5
issuer operable ‘to “disengage_ the’ clutch against
6
ward ‘the back plate, one spring for each lever,‘
each spring thrusting at one end against the back
plate, extending through the open bottom of the
the‘sprlng means and levers for transmitting the
motion'of} the throw-out collar to the pressure
ring; of the back plate being formed with pro
jecting fulcrums and' the pressure ring with
shoulders against which the levers thrust at their
outer ends,~th'e clutch levers being formed with
transverse notches intermediate of the side edges
notch part way around the fulcrum and then
extending rearwardly vof thev lever and arched to
press at its other end against the rear sides of >
the levers.
,
6. In a clutch, the combination with driving
of the levers on the side thereof toward the back
and driven members, a back plate having open
plate for receiving the fulcrums and the endpor 10 ings therein, a pressure ring rotatable with the
tions'of the fulcrums bearing on the levers be
driving member and having arms extending
‘yond the opposite ends of the notches, and spring
through the openings inthe back plate, spring
means urging the levers toward the back plate to
means pressing the pressure ring against the
vhold the levers on the fulcrums with the inter
driven member tov engage the clutch, a throw-out
mediate portions of the fulcrums in said notches,
collar operable to disengage the clutch against the
the spring means coacting with the levers eccen
spring means and levers for transmitting the mo
tric to the fulcrums to also resist pivotal and vi
tion of the throw-out collar to the pressure ring;
'brating'movement of the levers, the springs being
of the back plate being formed with projecting
carried by the rearwardly extending arms and
and the pressure ring with shoulders
extending inwardly therefrom and pressing 20 fulcrum-s
against which the levers thrust at their outer
against the inwardly extending arms of the levers.
ends, the clutch levers being formed with trans
4. In a clutch, the combination 'with driving
verse notches intermediate of the side edges of the
and driven members, a back plate having open
levers on the side thereof toward the back plate
ings therein, a pressure ring rotatable with the
for receiving the ‘fulcrums and the end portions
driving member and having arms extending
of the fulcrums bearing on the levers beyond the
through the openings in the back plate, spring
opposite ends of the notches, the transverse
means pressing the pressure ring against the
notches opening at their bottoms through the
driven member to engage the clutch, a throw-out
levers, and springs for urging the levers toward
collar operable to disengage the clutch against
the back plate, one spring for each lever, each
the spring means and levers for transmitting the
spring thrusting at one end against the back
motion of the throw-out collar to the pressure
plate, extending through the open bottom of the
ring; of the back plate being formed with pro
notch part way around the fulcrum and then ex
jecting fulcrums and the pressure ring with
tending rearwardly of the lever and arched to
shoulders against which the levers thrust at their
press at its other end against the rear sides of
outer ends, the clutch levers being formed with 35 the levers, the fulcrums being formed with grooves
transverse notches intermediate of the side edges
through which the springs extend.
of the levers on the side thereof towards the back
7. In a clutch, the combination with driving
plate for receiving the fulcrums and the end
and driven members, a back plate having open
portions of the fulcrums bearing on the levers
ings therein, a pressure ring rotatable with the
beyond the opposite ends of the notches, and 40 driving ‘member and having arms extending
spring means urging the levers toward the back
through the Openings in the back plate, clutch
plate to hold the levers on the fulcrums with the
spring means pressing the pressure ring against
intermediate portions of the fulcrums in said
the driven member to engage the clutch, a throw
notches, the spring means coacting with the
out collar operable to disengage the clutch against
levers eccentric to the fulcrums to also resist
pivotal and vibrating movement of the levers, the
levers being channel-shaped in general form with.
their channels toward the back plate and the
fulcrums extending into the channels substan
‘ the spring means, and levers for transmitting
tially the full width of the channels holding the '
levers from lateral displacement, the springs
being carried by the rearwardly extending arms
and extending inwardly therefrom and pressing
against the inwardly extending arms of the levers.
5. In a clutch, the combination with driving
and driven members, a back plate having open
ings therein, a pressure ring rotatable with the
driving member and having arms extending
through the openings in the back plate, spring
means pressing the pressure ring against the
driven member to engage the clutch, a throw-out
collar operable to disengage the clutch against
the spring means and levers for transmitting the
motion of the throw-out collar to the pressure
ring; of the back plate being formed with pro‘ 65
J'ecting fulcrums and the pressure ring with shoul
ders against which the levers thrust at their outer
ends, the clutch levers being formed with trans
verse notches intermediate of the side edges of ‘
the levers on the side thereof toward the back
plate for receiving the fulcrums and the end por
tions of the fulcrums bearing on the levers be
yond the opposite ends of the notches, the trans
verse notches opening at their bottoms through
the levers, and springs for urging the levers to
the motion of the throw-out collar to the pres
sure ring; of fulcrums projecting from the back
plate, and the arms of the pressure ring being
formed with notches on their inner sides, the
clutch levers being formed with open seats for
receiving the fulcrums, each fulcrum coacting
with its lever on opposite sides of the seat, the
levers also having notches at their outer ends
providing bifurcations extending on opposite sides
of said arms, the bottoms of the notches in the
levers seating on the bottoms of the notches in
said arms and the levers thrusting on the rear
walls of the notches in said arms, the bifurca
tions of the levers being of such length as to
engage at their ends with the back plate when
the inner ends of the levers have been moved
outwardly a predetermined amount and thus lock
the levers from further pivotal movement and
hence the pressure ring from movement by the
clutch spring means.
8. In a clutch,_the combination with driving
and driven members, a back plate having open
ings‘ therein, a pressure ring rotatable with the
driving member and having arms extending
through the openings in the back plate, spring
means pressing the pressure ring against the
driven member to engage the clutch, a throw
out collar operable to disengage the clutch against
the spring means and levers for transmitting the
motion of the throw-out collar to the pressure
2,405,357
7
ring; of the back plate-being formed with pro
8
out collar operable to disengage the clutch. against
the spring means and levers for transmittingthe
jecting fulcrums, and the arms of the pressure
motion
of the throw-out collar to the pressure
ring with notches on the inner sides thereof to
ring; of the back plate being formed with; pro
ward the axis of the clutch for receiving vthe
outer ends of the levers, the clutchlevers being U! jecting fulcrums, and the arms of the pressure ring
with notches on the inner sides thereof toward
' formed with transverse notches intermediate of
the axis of the clutch-for receiving the outer ends
their side edges on the side thereof toward the
of the levers, the clutch levers being formed with
back plate for receiving the fulcrums and, the
transverse notches intermediate of their side edges
end portions of the fulcrums bearing on the levers
beyond. the opposite ends of the transverse 10 on the side thereof toward the back plate for
receiving the iulcrums and the end portions of
notches, and a spring, one for each lever, each
the fulcrums bearing on the levers beyond. the
spring having a bowed portion between its ends,
opposite ends of'the transverse notches, and a
the inner end‘ of each spring thrusting against
spring, one for each lever, each spring having a
the inner arm of the adjacent lever and the outer
end thrusting against the rear wall of one of‘ said 15 bowed portion between its ends, the inner end of
each spring thrusting against the inner arm of
notches, the outer ends of the levers bearing on
the adjacent lever and the outer end thrusting
the ends of the springs in the notches.
against the rear wall of one of said notches, the
9. In a clutch, the combination with driving
outer ends of the lovers bearing on the ends of
and driven members, a back plate having open
ings therein, a pressure ring rotatable with the 20 the springs in the notches, the springs at their
inner ends being, anchored to the inner arms of
driving member and having arms extending
the levers.
through the openings in the back plate, spring
GEORGE T. JARRETT.
means pressing the pressure ring against the
driven member to engage the clutch, a throw
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