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Патент USA US2409758

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Patented Oct. 22, 1946
2,409,757
UNITED STATES PATENT OFFICE
CLUTCH
Frank L. Hetzel, Hermosa Beach», and Volñey E.
Carstedt, Los Angeles, Calif.
Application June 24, 1944, Serial No. 541,88‘6
3 Claims.
(o1. 19a-105)
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2
gag'ement with the `friction ring and the actu
ating spring >expe'inded into engagement with
This invention relates to clutches and more
particularly to a clutch of the centrifugal type.
The general object of the invention is to pro
vide _an improved centrifugal clutch, which is
said ring, which positions of said springs are
assumed when said clutch member is rotated'
simple in construction,«_efûcient in operation, easy
above a predetermined speed and the clutch is in
to repair and inexpensive te manufacture.
its power drive position.
A more particular object is to provide an im
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Fig. 9 is 'a view like Fig. T of ,the modification
of our clutch shown in Fig. 6; with the actuating
proved centrifugal clutch with means, actuated
by centrifugal force, for causing the clutch inem
spring contracted out of engagement with the
bers to be interen'gaged, when one of the clutch 10 friction ring and the auxiliaryspring expanded
members is rotated above a predetermined speed.
out of engagement 'with' said ring, when one o_f
A further object is to provide a centrifugal
the clutch members is rotated vby the power shaft
clutch with means for causing the clutch mem
bers to be interengaged during rotation of one
of said members up to a predetermined speed,
at a predetermined speed, and the clutch as idling
with its other member stationary and said power
shaft
and including means actuated by centrifugal
force, for causing the clutch members to be
interengaged when one of the clutch members
is rotated above said predetermined speed.
Other objects and advantages will appear here
turning ltherein. u
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A Fig. 10 is a Afragamentary section taken on line
2'--2 of Fig; ôilliistrating` novel means for pre
venting ovne of the clutch members from sliding
«ma
Shaft.`
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,
,
.
Referring more particularly to the drawings in
which corresponding parts are designated by the
inafter as this specification progresses.
rl‘he invention is illustrated in the annexed
drawings, which form a part of this specifica
saine reference characters in all of the views our
clutch includes primarily a~ pair of clutch mem
bers I and _2, va _fiat clutchvring 3 and an actuat
ing coil spring 4 arranged in ring formation.
tion, and in which:
Fig. 1 is an inner side view of one of the clutch
members, with the friction ring removed from
said member, and the actuating spring con
tracted to its inoperative position.
The clutch member I A is of circular dish
formation, open at its forward side and Vformed
with a hub 5, 'a side wall 6; a cylindrical periph
Fig. 2 is a longitudinal section of the clutch
taken on line 2_2 of Fig. 5, with the clutch mem
eral wall ‘I extending rforwardly from said side
wall, and
enlarged hub portion ß formed also
bers disengaged and the clutch in its inoperative
integral with said side wall 6 andV extending
forwardly therefrom tona'point within the> for
ward annular edge of> said cylindrical peripheral
_ position.
Fig. 3 is a view like Fig. 1, except that the
actuating spring of the clutch is shown in its
wall 1. A’plurality of pins~ 9, >preferably three,
are secured in the enlarged hub ,portion 8 equi
expanded and operative position.
distant apart Yand project forwardly therefrom,
Fig. 4 is a view like Fig. 2, except that the clutch
members are shown engaged with the clutch in
its operative position.
Fig. 5 is a side View of the clutch.
Fig. Gris a cross section taken on line 6-6 of 40
Fig. 7, of one of the clutch members of a modi
fication of our invention, with the friction ring
removed from said member and with the main
slidably thröügh a correspondingl number of
apen-ings IU, respectively, in the clutch ring 3,
near the' inner edge of said ring, whereby said
ring is detachably mounted in operative position
in the forward side of the clutch member I. An
annular' friction cluteh- shoe II of suitable mate
rial is secured tó the forward side of the clutch
actuating spring contracted to its inoperative
e, for engaging
clutch member 2 Vas will
position and the auxiliary spring contracted into 45 be hereinafter more 'f'ull‘yudescribed In the
its operative position, which positions of said
córner between the _side` wall 6- and the Cylindri
springs, are assumed when either clutch mem
cal peripheral wall -I` _is formed _an annularâcam
ber is rotated below a predetermined speed and
_I2 to be engaged by theactuating coil spring 4
the clutch is in its starting drive position.
in the
and for thepurpos'e hereinafter
Fig. '7 is a longitudinal section of the modifi 50 dèäê?íbëdl The`
4' is DÖS-îtîòne‘d Within
the Clutch ñ‘ièlnbë? I aròund 'the' periphéi‘y I3
cation of our clutch, as illustrated in Fig. 6, taken
on line 'I-'I of Fig. 6.
of the enlarged hub’p'ort'iòn'- 8' òf said- clutch mem
ber between the side‘ wall 6` óf said clutch> mein
Fig. 8> is a view like Fig. ’7 of the modification of
our clutch show'n in Fig. 6, with the auxiliary
b‘er and the clutch ring 3`, with' the' ends of said
spring expanded by centrifugal force out of en
55 spring c’on'ne'cted together by intereng‘aging
` 2,409,757
3
4
hooks I4 and I5 formed onthe ends, respectively,
of said spring; the spring being of such length
mitted by the clutch, through its pulley I8 and a
`
that with its ends connected together it is con
tracted around and against the periphery I3 of
the enlarged hub portion 8 underrproper tension
in its ineffective position when the clutch mem
ber l is at rest, as illustrated in Figs. 1 and2`, for
the purpose hereinafter described.
The clutch member 2 comprises a disc I6 with
a hub >Il extendingv outwardly therefrom in
which hub is formed a grooved pulley I8 to receive
a belt through which power may be transmitted
by the clutch.
The clutch member I is keyed on a drive shaft> l
I5 by a key 2.3„ whileV ther clutch member 2_is
turnably mounted on said shaftV and- is main
tained in its operative position on said shaft,
belt extending around said pulley, to any suitable
mechanism for driving said mechanism.
In the modification of our invention shown in
Figs. 6 to 9 inclusive the construction is sub
stantially the same as that shown in Figs. 1 to 5
inclusive, with the addition of an auxiliary coil
spring 26 of smaller diameter kthan the diameter
of the actuating springV 4, arrangedin ring for
mation of greater diameter thantheidiameter of
the ring formation of said actuating spring 4
and surrounding said actuating spring, in its ring
y . formation, in the clutch member I, there being an
annular groove ‘2l in the inner side of the
peripheral wallî of said clutch member I at the
outer end of the annular cam I2, into which
rgroove said auxiliary spring 26 is expanded by
centrifugal force when said clutch member I is
with its disc I6 adjacent the forward end of the
hub 5 and the forward edge of the CylindricalY » rotated above a predetermined speed.
When the clutch member 2> is roated at any
peripheral wall l of the clutch member I, by a -,
speed up to a predetermined speed, the auxiliary
4collar 2l secured on said shaft I9, by a set screw
spring 26 is contracted, so that it engages the
adjacent the forward fend of the hub I'I-of
actuating spring 4 and the fiat clutch ring 3
said clutch member 2, the shaftv I9 extending
(Figs. 6 and 7) and presses said ring and its shoe
through and being operatively ñtted in the bores
AI I outwardly until said shoe engages the disc IB
of the hubs 5 and I1 of the clutch members I and
of the clutch member 2 with suiiicient friction to
2, respectively, with the key 20 secured in the
cause the clutch mem-ber I and shaft I9 to be
shaft IS and fitted in a groove 23 in the hub 5
rotated slowly by the clutch member 2 at a speed
of the clutch member I.
below said predetermined speed. Above said pre
' The clutch member I is secured on the shaft
lil against sliding on its key 20, by means of a RO determined speed said auxiliary spring 26 is ex
panded outwardly in its ring formation by cen
set screw 24, threaded in the hub 5 of said clutch
member and extending through said hub and
trifugal force, into the annular groove 21 in the
through a longitudinal groove 25 in the bore of
peripheral wall 'l of‘ the clutch member I, (Fig. 9)
vsaid hub, into engagement with said shaft. The
and the actuating spring 4 is expanded out
width of the groove 25 is greater than the
wardly in its ring formation by centrifugal Aforce
diameter of the set screw 24, so that the end of
and is directed forwardly by its engagement with
said screw when tightened against the shaft I9
the cam l2 into engagement with the clutch
mayy upset the surface of said shaft around said
ring 3 (Fig. 8) and said ring and its shoe II are
screw end in said groove, which prevents sliding
thereby forced forwardly until said shoe engages
of the end of said screw on said shaft, and thus 40 the disc I6 of the clutch member 2 with sufficient
locks the clutch member I on said shaft against
friction to cause the clutch member I to rotate
>sliding on said shaft over the key 2D. Upon
the clutch member 2, so that the power of the
4loosening said set screw 24 and withdrawing its
shaft i9 may be transmitted by the clutch
endfrom the upset portion of the shaft I9 the
through the pulley I8 on the clutch member 2
clutch ymember I may be withdrawn from said 45 as aforesaid, above said predetermined speed.
shaft',l the key 2i) passing through the key groove ’
We claim:
23 in the hub 5 of said clutch member and the
l. A. clutch as disclosed comprising a clutch
upset portion of the shaft I9 passing through the
member to be secured on a rotatable shaft, a
groove 25.
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second clutch member to be turnably mounted
The operation of the invention is as follows:
on said shaft, a clutch ring mounted to move
When the shaft I9 and the clutch member I,
laterally in said first clutch member, an actuat
are at rest the actuating spring 4 is contracted by
ing coil spring in said first clutch memberl ar
its tension around and into engagement with the
ranged in ring formation and to be expanded
periphery I3 of the enlarged hub portion 8 and
by centrifugal force upon rotation of said first
into engagement with the side wall 6 of said 55 clutch member above a predetermined speed,
clutch member, releasing the forward pressure
and a cam in said first clutch member to be
of the spring against the clutch ring 3, whereby
engaged by said spring when expanded to cause
said clutch ring and its shoe II are allowed to
said spring to engage and move said clutch ring
move away from the disc I6 of the clutch member
forwardly into frictional contact with said second
2, releasing said shoe from said disc, said move 60 clutch member to clutch said second clutch
ment of said ring being permitted by the pins 9
member to said first clutch member, an auxiliary
sliding in the openings I!) in said ring, as illus
spring in ‘said ñrst clutch member arranged in
trated in Figs. l and 2 of the drawings.
ring formation surrounding said actuating spring
Rotation of the drive shaft I9 rotates the clutch
in its ring formation and constructed and ar
member l, and, at a predetermined speed of 65 ranged to be contracted between said actuating
rotation of said clutch member, the contracted
spring and said clutch ring to force said clutch
actuating spring 4 is expanded outwardly by
ring into frictional contact with said` second
centrifugal force and is directed forwardly by its
clutch member to clutch said clutch members
engagement with the cam I2, into engagement
together, ~when said second clutch member is
with the clutch ring 3, whereby said ring is moved -70 rotated below said predetermined speed, and
forwardly, sliding on the pins 9 until thering
said auxiliary spring being constructed and ar
shoe II, engages the disc I6 of the clutch mem
ranged to be expanded by centrifugal force out
ber 2 with sufficient friction to cause the clutch
'of effective frictional Contact with said clutch
member > I to rotate the clutch member 2 so
`ring when either of `said clutch members is
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«that the power of the shaft I!! may be trans 75 rotated'above said predetermined speed.
2,409,757
5
2. A clutch as claimed in claim 1 in which the
first clutch member is formed with an annular
groove into which the auxiliary spring is ex
panded When either clutch member is rotated
above a predetermined speed.
3. A clutch as disclosed comprising a first
clutch member to be secured on a rotatable shaft,
a second clutch member turnably mounted on
said shaft, means for clutching said clutch mem
bers together when either of said clutch members
is rotated below a predetermined speed, and
means for automatically clutching said clutch
members together when either of said clutch
members is rotated above a predetermined speed
and said ñrst clutching means is disengaged
and thereby rendered inelîective.
FRANK L. I-IETZEL.
VOLNEY E. CARSTEDT.
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