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Dec. 10, 1946.
2,412,351
D. L. MOUNT
VARIABLE SPEED TRANSMIITER
Filed July 14, 1944
2 Sheets-Sheet 1
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INVENTOR.
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Dec. 10, 1946.
D_ |__ MOUNT
2,412,351
VARIABLE SPEED TRANSMIITER
Filed July 14, 1944
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Q595
Patented Dec. 10, 1946
2,412,351
UNITED STATES ‘PATENT OFFICE
2,412,351
VARIABLE-SPEED TRANSMITTER
1
Donald L. Mount, Memphis, Mo.
Application July 14, 1944, Serial No. 544,895
> 17 Claims.
(Cl. 74—193)
2
My present invention relates to a power trans
mission wherein the speed between the driven
element and the driving element may be varied
in in?nitely small steps between the limits of
speed change.
One object of the invention is to provide a
variable speed transmitter wherein there is a
relatively simple arrangement for automatically
shifting a ball that frictionally engages a pair of
cone surfaces so that the ball and the cone sur
faces have continuously varying diameter rela
showing two balls instead of one in my transmisé
s1on.
0n the accompanying drawings, I have used
the reference numeral Ill to indicate a main
frame, which frame has an upper extension l2
and hubs l4 and I6 aligned with each other. In
the hub M, a cone element C is journaled and
within the cone element 0 is a second cone ele
ment C’. The cone element 0' is part of or
10 mounted on a driven shaft l1 and has a freely
rotatable ring portion l8. The shaft I‘! is J'our
tionship to each other as the cones are relatively
naled in the hub I8 and in a hub H! of the cone
shifted, the output speed being thereby varied
element C and is slidable relative thereto. A
sleeve 20 is threaded on the shaft l1 and is lo
cated relative thereto in various adjusted posi
tions by a lock nut 2|. A spring 22 extends be
tween the upper end of the sleeve 20 and the
hub It for normally raising the shaft [1 and a
stop collar 23 limits the upward movement.
20
The cone element C, it will be noted, has an
to any desired proportion within the range of
the transmitter.
-
-
Another object is to provide a construction of
this character wherein the cone elements may
be mounted on a common axis and the ball ele
ment is engaged frictionally with the surfaces of
the cones and caused to roll radially inward on
both cones during the adjustment whereby fric
tion occurring during the adjustment period is
minimized and a driving connection is main
tained at all times during the adjustment.
Another object is to provide an arrangement of
interior cone surface whereas the cone element
C’ has an exterior oone surface. A ball B is
adapted for frictional engagement with these
surfaces, and the ball is rotatable on a shaft 24.
The shaft 24 is carried by a frame F, having a
one cone within the other, and their cone sur
yoke portion 25 and arm portions 26 extending
faces being external and internal respectively, so
therefrom, as best shown in Figure 1. The outer
as to present a V-shaped groove in which a ball
ends of the arms 26 are rotatable in hubs 21 of
rests under spring pressure and the ball is car
vertical sleeves 28, which sleeves are vertically
ried by a framework having a compound motion 30 slidable on rod portions 29 of a sub-frame F’.
that actnates a pinion and rack mechanism to
The sub-frame F’ has a rack 30 parallel to the
rotate the ball to different adjusted positions in
rod 29, and has a horizontal rod-like portion 3|
relation to both cones as they are relatively ad
slidable in a bearing 32 of the main frame It.
justed. ,
Two of the bearings 32 and two of the sub-frames
With these and other objects in view, my in 35 F’ are provided. Only one rack 30 need be pr_o_
vention consists in the construction, arrangement
vided, however, and a pinion 33 is in mesh there
and combination of the various parts of my de
with. The pinion 33 is mounted on one of the
vice, whereby the objects contemplated are at
arms 26 of the yoke frame F so that vertical
tained, aslhereinafter more fully set forth, point
sliding movement of the sleeves 28 will result in
ed out in my claims, and illustrated in the 40 rotation of the yoke frame F, and consequently
accompanying drawings, wherein:
rotation of the shaft 24 on that axis of the ball
Figure J. is a plan view of a variable speed
B which is horizontal and at right angles to the
transmitter embodying my invention;
longitudinal axis of the shaft itself.
Figure 2 is a side elevation thereof;
The two sub-frames F’ may be connected to
Figure 3 is a sectional view on the line 3-3 45
gether to facilitate their simultaneous movement
of Figure 1 showing the parts of the transmitter
by rigid links 34 and 35. On the rod 29 of each
adjusted to a different position;
sub-frame F’ is a spring 36. It is interposed be
Figure 4 is a sectional view on the line 4-4 of
tween the upper end of the sleeve 28 and a collar
Figure 2;
'
Figure 5 is a side elevation, partly in section 50 31. A lever 38 pivoted at 39 to the frame exten
sion I2 is adapted to bear against rollers 39 on
showing a modi?ed construction wherein weights
the collar and in turn to be engaged with the
are used instead of springs as in Figure 2 ;
sleeve 20 whereby downward movement of the
Figure 6 is a similar view showing a different
spring arrangement than Figure 2; and
sleeve will result in an increase in pressure of
Figure 7 is another modi?ed construction 65 the springs 36 and consequently of the ball B
27.412351
.
3
‘
against the ‘cone surfaces as will hereinafter ap
ar.
peIn Figure 5. I show a modi?ed construction
wherein weights 36a take the place of the spring
3.6 in Figure 2 and weights 22a take the place of
thespring 22. The weights 36a are imposed di
rectly on the bosses 28 without any connection
such as the lever 38 in Figure 2 with the weights
22a. The weights 22a in turn are carried by a
vertical sleeve 50 slidably mounted on. a post 52
of the frame member I2 and keyed against turn
ing by a key 54. The sleeve 50 has rack teeth 58,
4
L9
ried by the sub-frames F’, the sub-frames them
selves moving toward the right and the frame F
moving downwardly relatively to the sub-frames
or downwardly and toward the right with rela
tion to the main frame. jTherdownward move
ment of the frame F relative to the sub-frame F’
causes the pinion 33 to‘ roll down the rack 30.
thus imparting the desired clockwise rotation to
the yoke frame F, so that the ball B engages the
cone surfaces at progressively dl?erent diameters
of the ball.
a
In the ?nal or lowest position of the lever 4|,
the shaft 24 has tipped to such a position that
' ‘ which through a pinion 58 impart movement to
the headof the shaft indicated at 240 is in con
a rack sleeve 60 mounted under the collar 20a of .
the shaft IT. The weights 22a accordingly tend 15 tact with the freely rotatable ring l8 andv the
ring can accordingly remain stationary while the‘
to raise the shaft l1 and the cone C’ in substan
cone C’ rotates, the head 24a constituting a "dead
tially the'same manner that the spring 22 does
spot” ‘for engagement with the element I8 at this
~ so in Figure 2.
time, During the relative adjustment of the
In Figure 6 I show springs 22b and 36b in place
of the springs 22 and 3B of Figure 2. the two 20 cones C and C’, the ball B merely rolls along the
cone surfaces, downwardly along one as it moves
springs in this instance being independent in
upwardly along the other, and this'rolling action
stead of inter-connected by the lever 38 of Figure
2 .
eliminates any sliding or other friction during
the adjustment for changing speeds.
Y
Figure 7 shows still another spring arrange
My device is applicable for many installations
ment wherein a cross head 38c is interposed be 25
where a chahge in speed from a drive shaft to a
tween the springs 22c and 360 and a double ball
driven shaft is desired and where the power trans
arrangement is shown, so as to provide twice the
mitted is not very great. The device is preferably
traction and balance the driving tension in a
made with ball or roller bearings throughout in
more efficient manner. '
.
30 stead of plain bearings as illustrated, but of course
Practical operation
that is immaterial so far‘ as the patentable fea
In the operation of my variable speed trans
tures of my invention are concerned. The useof
ball or roller bearings is particularly desirable
mitter, assuming the parts to be in the position
when the device is used in connection with a meter
of Figure 2, it will be noted that the shaft 24 of
the ball B is substantially horizontal and accord 35 for the purpose of adjusting the indicating means
ingly the surfaces of the cones C and C' are en
of themeter in relation to the flow of the ?uid
gaging the ball at diameter lines on the ball sub- _ through the meter as friction'must be held to a
stantially equal to each other, The diameter line
minimum,
l.
of engagement on the cone C’ is less than the di
With respect to the lever 38, it effects an in
ameter line of engagement on the cone C, and
crease of the pressure of the springs 36 on the
sleeves'28 and thereby an increase in frictional
therefore the cone C will rotate in the same direc
engagement between the ball B and the cones C
tion but at less speed than the cone C’. Thus
and C’ as the cone C’ is adjusted downwardly.
power from any suitable source, may be applied
to the shaft l1 and a reduced speed taken off the
Since the sleeve 20 moves downwardly faster than
cone C, as by meshing of a gear with gear teeth 45 the ball B and consequently faster than the sleeves
48 thereon. The teeth 48 are shown merely by
28, the collars 31 are likewise moved downwardly
faster than the sub-frames F’, thereby e?ecting
way of illustration, whereas the power take-off
the desired increase in spring pressure.
may be provided in any other suitable manner.
The operation of Figure 5 is a little different
If new the speed is to be further decreased, the
shaft I‘! may be shifted downwardly. This may 50 than Figure 2 in that the yoke frame F is mounted
be accomplished, for instance, by means of an
on the other side of the ‘ball. In the position
adjusting lever 4| pivoted at 42 to the frame I 0
shown in Figure 5, the speed ratio is about one to
and carrying a pair of rollers 43 engaging a col
one. As the cone C’ is raised, the yoke ‘frame will
lar 44 of the shaft I ‘I. The spring 22 tends to
rotate counter-clockwise, and the ball will tilt
keep the shaft 1 ‘I raised but the lever may be used 55 with it and at the same time move outwardly from
the axis of rotation as well as be raised by the
for lowering it and may be locked in any desired
position by means of a detent 45. coacting with
inner cone. Finally the dead end of the ball will
contact the outer cone and the ball will rotate
serrations 46 of a stationary part of the main
freely under the driving force through friction on.
frame l8.
As the shaft I1 is moved downwardly, the cone 60 the cone 0', but no motion will be transmitted to
the outer cone.
-‘
.
C’ likewise moves downwardly. The springs 36
The weight arrangement shown in Figure 5 op
cause the ball B to follow the receding cone C’,
thereby decreasing the diameter lines of engage
erates in substantially the same manner as the
ment on both the ball and cone C’, and increasing
spring arrangement in‘ Figure 2, except that )the
the diameter line on the ball where it engages 65 pressure does not vary in different positions of
adjustment as where springs are used.
the cone C. The diameter line on the cone C de
‘ creases and, as an ultimate result of all these
With the spring arrangement in Figure 6, the
difference in position of the shaft I‘! does not
changes in diameters, the cone C rotates at a
progressively increased speed as the lever 4| is
change the collar 31b as in Figure 2.
adjusted downwardly and as a constant speed in 70
Figure 7 again is somewhat like Figure 2 but
without a change in leverage between the collar
' put is applied to the shaft IT.
The change in diameter on the ball B occurs
31c and the collar 28c. Instead the spring 220
due to the yoke frame F rotating clockwise in
Figure 2 as the cone C’ is lowered. Such rotation
occurs as a result of the way the frame F is car
is opposed by the two springs 36c and all three
springs accordingly cooperate to bias the shaft H
in an upward direction. Figure 7 shows a better
2,412,851
5
arrangement from an eiiiciency standpoint by
having two balls for balancing the pressures in
able relative to each other, rack and pinion
means for rotating said ball element about its
stead of one as in the previous ?gures.
Some changes may be made in the construction
tively adjusted, and means for increasing the
axis of oscillation as said cone elements are rela
and arrangement of the parts of my device with
out departing from the real spirit and purpose of
my invention, and it is my intention to cover by
my claims any modi?ed forms of structure or use
of mechanical equivalents which may be reason
ably included within their scope without sacri?c
ing any of the advantages thereof.
I claim as my invention:
'
pressure of said ball element against said cone _
elements in one direction of axial movement of
the cone elements relative to each other.
5. In a‘ variable speed transmission‘device, a
-- pair of cone elements mounted for rotation on
10 a 00111111021 axis and arranged one within the
other, means for driving one of said cone 816-‘
ments and utilizing the other as a driving means,
1. In a variable speed transmitter, a, pair of cone
.and means for varying the relative speeds of said
elements mounted for rotation on a common axis
cone elements, comprising a rotatable ball ele
and being arranged one within the other,means 15 ment engaged with both, a frame for said ball
for driving one of said cone elements and utiliz- .
element pivoted for oscillation on an axis at
ing the vother as a driving means, and meansfor
right -’angles to the axis of rotation of said ball
varying the relative speeds of said cone elements,
element to shift the secant line of engagement
comprising a rotatable ball element engaging with
between the ball element and the cone elements,
both of said cone elements to transmit rotation 20 simultaneously increasing one ‘and decreasing
from one to the other, said ball element being
the other, said cone elements being axially ad
pivoted for oscillation on a-line at right angles
justable' relative to each other, and rack and
to its axis of rotation to shift the secant line of
pinion means for rotating said ball element
engagement between the ball element and the cone
about its axis of oscillation as said cone elements
elements, simultaneously increasing one and de
creasing the other, said cone elements being ax
ially adjustable relative to each other, and means
biasing said ball element to engage said cone ele
25
are relatively adjusted.
6. In a variable speed transmitter, a pair of
cone elements mounted for rotation on a com
mon axis and arranged one within the other
‘
and for relative axial adjustment, and means
2. In a speed transmitter of the character dis 30 for varying the relative speed of said cone ele
closed, a pair of cone elements mounted for ro
ments, comprising means for axially adjusting
tation and for axial adjustment in relation to
them and a rotatable ball element engaging both
each other, means for driving one of said cone
to transmit rotation from one to the other, said
elements and utilizing the other as a driving
balkelement being pivoted for oscillation to shift
means, and means for varying the relative speed 35 the secant line of engagement between the ball
of said cone elements, comprising means for ef
element and the cone elements simultaneously as
fecting axial adjustment thereof and a rotatable
said cone elements are axially adjusted relative to
ments.
vball element engaging both of them to transmit
each other.
rotation from one to the other, means biasing
7. A variable speed transmitter comprising a
said ball element to engage said cone elements, 40 pair of cone elements, one having an internal
and means for eifecting a following of said ball
surface and the other an external surface, and
element relative to said cone elements during
the latter being mounted inside the former, one
adjustment of said cone elements relative to each
of said cone elements being driven and the other
other.
'
constituting a driving means, a ball element en
3. In a variable speed transmission device, a
gaging the cone surfaces of both of said cone
pair of cone elements mounted for rotation on a
elements, means for mounting said ball element
common axis and arranged one within the other,
comprising a shaft on which it is rotatable, a
means for driving one of said cone elements and
yoke frame carrying said shaft for oscillation on
utilizing the other as a driving means, and means
an axis normal to the axis of rotation of said
for varying the relative speeds of said cone ele 50 ball element, means biasing said yoke frame'to
ments, comprising a rotatable ball element en
move in a direction for frictionally engaging
gaged with both, a frame for said ball element piv
said ball with said cone surfaces, means geared
oted for oscillation on an axis at right angles to
to said yoke frame to cause it to rotate as the
the axis‘of rotation of said ball element to shift
ball element is shifted relative to the cone sur
the secant line of engagement between the ball 55 faces, and means for shifting said ball element
element and the cone elements, simultaneously in
relative to said cone surfaces comprising mech
creasing one and decreasing the other, said cone
anism to move one cone element axially rela
elements being axially adjustable relative to each
tive to the other cone element and including a
other, and means biasing said ball element to re
sub-frame relative to which said yoke frame is
siliently engage said cone elements and follow 60 slidable, a main frame supporting said cone
them during such axial adjustment.
elements, said sub-frame being slidable relative
thereto at right angles to the sliding of the yoke
frame relative to said sub-frame, a rack carried
a common axis and arranged one within the
by said sub-frame and a pinion on said yoke
other, means for driving one of said cone ele 65 frame engageable therewith for rotating the
ments and utilizing the other as a driving means,
yoke frame in accordance with the adjustment
4. In a variable speed transmission device, a
pair of cone elements mounted forrotation on
and means for varying the relative speeds of
of said cone elements, one of said cone elements
said cone elements, comprising a rotatable ball
and said ball having, respectively, a freely ro
element engaged with both, a frame for said ball
tating ring and a dead-spot comprising the end
element pivoted for oscillation on an axis at right 70 of said shaft for coaction with each other at one
angles to the axis of rotation of said ball element
limit of adjusting movement of the cone elements
to shift the secant line of engagement between
relative to each other.
the ball element and the cone elements, simul
8. A variable speed transmitter comprising a
taneously increasing one and decreasing the
pair of cone elements, one having an internal
other, said cone elements being axially adjust
surface and the other an external surface, and
2,412,851
7
a"
,
i the latter being mounted inside the former and
the two being axially adjustable in relation to
each other, a ball element engaging the cone
surfaces of both of said cone elements, means
' the adjustment of said
cone elements, one of said
cone elements and said ball having, respectively,
a freely rotating ring and a dead-spot for coac-‘
‘ tion with each other at one limit of adjusting
‘ .for mounting said ball element comprising a
shaft on which it is rotatable, a yoke frame car
movement of the cone elements relative to each
pair of cone elements, one having an internal sur
face and the other an external surface, and the
means to oscillate said frame in accordance with
other.
7
-
12. A variable speed transmitter comprising a
rying said shaft for oscillation on an axis normal
pair of cone elements mounted on a common axis.
to the axis of rotation of said ball element,
one having an internal cone surface and the
means biasing saidryoke frame to move in a
other an external cone surface, and the latter
direction for frictionally engaging said ball with
being mounted within'the former, one of said
said cone surfaces, means geared ‘to said yoke
cone elements being driven and the other con
frame to cause it to rotate as the ball element
stituting a driving means, a ball element re
is shifted relative to the cone surfaces, and‘
siliently engaging both of said cone ‘surfaces,
means for shifting said ball element relative to
said cone surfaces, in accordance with the axial 15 means for mounting said ball- element compris
ing a shaft on which it is rotatable, a frame carry
adjustment of said cone elements, one of said
cone elements and said ball having, respectively, ‘ ring said shaft for oscillation 0n anaxis normal
to the axis of said shaft, said frame'being oscil
a freely rotating ring and a dead-spot for coac
latable to shift said ball element in its diametri
tion with each other at one limit of axial ad
justing movement of the cone elements relative, 20 cal engagement with said cone surfaces compris
ing. mechanism to move one cone element axially
to each other.
relative to the other cone element and including
-9. A variable speed transmitter comprising a
the adjustment of said cone elements.
‘
13. In a speed transmitter of the character dis- I
latter being mounted inside the former, a ball 25
closed, a pair of cone elements mounted for ro
element engaging the cone surfaces of both of
tation and for relative axial adjustment, means
said cone elements, means for mounting said ball
for driving one of said cone elements and utiliz
element comprising a shaft on which it is rotat
ing the other as a driving means, and means for
able, a yoke frame carrying said shaft for oscilla
tion on an axis normal to the axis of rotation of 30 varying the relative speed of said cone elements,
comprising means for axially adjusting them and
said ball element, means biasing said yoke frame, .
to move in a direction for frictionally engaging
a, rotatable ball element engaging both of them
to transmit rotation from one to the other,
said ball with said cone surfaces, means geared‘
Weights biasing said ball element to engage said
to said yoke frame to cause it to rotate as the ball
element is shifted relative to the cone surfaces,
cone elements, and means for effecting a follow
and means for shifting said ball element relative
up of said ball element with respect to said cone
to said cone surfaces comprising mechanism to
elements during adjustment of said cone elements
move one cone element axially relative to the
relative to each other.
other cone element, one of said cone elements and
14. In a variable speed transmission device, a
said ball having, respectively, a freely rotating
pair of cone elements mounted for rotation on
ring and a dead-spot comprising the end of said:
a common axis and arranged one within the oth
shaft for coaction with each other.
\
er, means for driving one of said cone elements
10. A variable speed transmitter comprising a
and utilizing the other as a driving means, and
pair of cone elements, one of said cone elements
means for varying the relative speeds of said
being driven and the other constituting a driving 45 cone elements, comprising a rotatable ball ele
means, a ball element engaging the surfaces of
ment engaging with both cone elements, a frame
both cone elements, means for mounting said ball
for said ball- element pivoted for oscillation on an
elements comprising a shaft on which it is rotat
axis at right angles to the axis of rotation of
able, a frame carrying said shaft for oscillation
said ball element to shift the secant line of en
on an axis normal to the axis of rotation of said 50 gagement between the ball element and the cone
ball element, means geared to said frame‘ to cause
elements, simultaneously increasing one and de
it to rotate for shifting said ball element relative
creasing the other, said cone elements being ax
to the cone surfaces, mechanism to move one
ially adjustable relative to each other, rack and
cone element axially relative to the‘other cone
pinion means for rotating said ball element about
element, and an inter-connection between said 55 its axis of oscillation as said cone elements are
last means and said geared means for rotating
relatively adjusted, and weight operated means
said frame in accordance with the adjustment of
for biasing said ball elements towards said cone
'said cone elements.
elements and one of said cone elements away
' 11. A variable speed transmitter comprising a
from the other one.
,
pair of cone elements mounted on a common axis, 60
15. In a speed transmitter of the character dis
one having’, an internal cone surface and the
closed, a pair of cone elements mounted for rota
other an external cone surface, and the latter
tion and for relative axial adjustment, means for
being mounted within the former, one of said
driving one of said'cone elements and utilizing
cone elements being driven and the other con
the other as a driving means, and means for vary
stituting a driving means, a ball element resilient 65 ing the relative speed of said cone elements, com
ly engaging both of said cone surfaces, means
prising means for effecting such axial adjust
for mounting said ball element comprising a
ment and a pair'of rotatable ball elements located '
shaft on which it is rotatable, a frame carrying
diametrically opposite each other and engaging
said shaft for oscillation on an axis normal tov
both cone elements to transmit rotation from
the axis of said shaft, said frame being oscillat 70 one to the other, means biasing said ball ele
able to shift said ball element in its diametrical
ments to engage said cone elements, and means
engagement with said cone surfaces comprising
for effecting a following of said ball elements in
mechanism to move one cone element axially
relation to said cone elements during relative ad
relative‘to the other cone element and including
justment of the cone elements.
means to oscillate said frame in accordance with 75
16. In a variable speed transmission device, a
2,412,851
10
pair of cone elements mounted for rotation on a
common axis and arranged one within the other,
17. In a variable speed transmitter, a pair of
cone elements mounted for rotation on a com
means for driving one of said cone elements and
utilizing the other as a driving means, and means
mon axis and arranged one within the other for
relative axial adjustment, means for varying the
for varying the relative speeds of said cone ele 6 relative speed of said cone elements, comprising
means for changing such axial adjustment and
ments, comprising a pair of rotatable ball ele
ments engaged with both cone elements and lo
a rotatable ball element engaging both to trans
cated diametrically opposite each other, a frame
mit rotation from one to the other, said ball ele
ment being pivoted for oscillation to shift the
secant line of engagement between the ball ele
ment and the cone elements simultaneously as
the cone elements are axially adjusted relative to
each other, and spring means biasing said cone
creasing one and decreasing the other, said cone
elements relatively away from each other and
elements being axially adjustable relative to each 15 said ball element relatively toward said cone ele
ments, said spring means being mounted in series
other, and means for rotating said ball elements
relation to each other.
about their axes of oscillation in accordance with
the relative adjustment of said cone elements.
DONALD L. MOUNT.
for each of said ball elements and each pivoted
for oscillation on an- axis at right angles to the
axes of rotation of said ball elements to shift the
secant line of engagement between the ball ele
ments and the cone elements, simultaneously in
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