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Патент USA US3097550

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July 16, 1963
3,0 97,540
H. BERENS
AUTOMATIC CHAIN TIGHTENING MECHANISM FOR INFINITELY
VARIABLE CONE PULLEY GEARS
Filed July 9, 1962
2 Sheets-Sheet 1
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/ IIIIIIIIIIIIIIIII
I
7
INVENTOR.
BY
HEM/RICH BERE/VS
July 16', 1963
H. BERENS
3,097,540
AUTOMATIC CHAIN TIGH TENING
MECHANISM F0R INFINITELY
VARIABLE
CONE
PULLEY
GEARS
Filed July 9, 1962
2 Sheets-Sheet 2
INVENTOR.
HEINRICH BERENS
81,1344 Zia/01W?
United States Patent ()?ice
3,097,540
Patented July 16, 1963
1
2
3,097,540
has been tightened to its proper tension. Since it is the
sense and purpose of an in?nitely variable transmission to
AUTOMATIC CHAIN TIGHTENING MECHANISM
FOR INFINITELY VARIABLE CONE PULLEY
GEARS
Heinrich Berens, Bad Homhurg vor der Hohe, Germany,
assignor to Reimers Getriebe K.G., Ascona, Switzer
land, a ‘?rm of Switzerland
Filed July 9, 1962, Ser. No. 208,438
Claims priority, application Germany Mar. 17, 1962
4 Claims. ((31. 74—230.17)
The present invention relates to a mechanism for auto
attain the best possible operating conditions by varying
the speed ratio in response to a change in the driving
speed, it is usually necessary to readjust the transmission
ratio rather frequently either upwardly or downwardly
by means of the setting spindle. The present invention
now provides that any such adjustment of the setting
spindle will be employed for also tightening the chain,
10 provided that its tension has decreased to such an extent
that the resulting change in position of the tension shoes
matically tightening the endless driving belt or chain of an
will permit the shift rod which is eccentrically mounted
in?nitely variable cone pulley transmission of the type as
on the tension spindle to act upon the ratchet wheel. The
described in the copending application of Fritz Karger
high speed reduction ratio which is provided for driving
and Carl Gausman, Serial No. 187,238, ?led on April 15 the setting spindle or the slow rotation thereof when
13, 1962, in which tension shoes are provided which slide
manually adjusted easily permits both actions to be car
under spring pressure along the belt or chain (both being
ried out at the same time, that is, the adjustment of the
hereafter collectively referred to as a “chain”) and in
transmission ratio and the retightening of the chain.
which the chain running between two pairs of conical
Naturally, this requires a slightly greater force. Accord
pulley disks, which are adjustable relative to each other in 20 ing to another feature of the invention this increased force
opposite axial directions by means of control levers, may
requirement may, however, also be compensated by driv
be tightened by means of a spindle which carries the
ing the shift rod which actuates the ratchet wheel also by
control levers and permits the distance between the
means of the main transmission shaft through a double
conical disks of each pair to be adjusted in the same direc~
helical gear unit which reduces the movements of the
tion. This mechanism is designed so that the chain 25 main transmission shaft very highly so that the shift rod
tightening means may be driven temporarily by normally
will carry out continuous reciprocating movements of a
moving elements of the transmission namely, at such
low frequency. When the rocker is pivoted by the pres
times during the operation of the transmission when it
sure of the cam surfaces on the tension shoes against
becomes necessary to tighten the chain and until it has
the rods on the rocker, the operation of retightening the
been readjusted to the proper tension.
30 tightening spindle will therefore be effected immediately
The means for transmitting a driving force from these
by the reciprocating shift rod rather than later by the ad
normally moving elements of the transmission to the
justment of the transmission ratio of the transmission
tightening spindle-and always in the direction in which
by the setting spindle, as occurred in the tightening mech
the chain will be tightened-may be made of different
anism as described in the mentioned copending applica
designs. In transmissions of the type in which tension 35 tion.
The ratchet device is designed so that when the
shoes slide under spring pressure along the stringers of
rocker is not pivoted away a nose on a setting element
the chain it is evident that, since the position of these
which is mounted on the rocker will hold the shift rod
tension shoes is necessarily determined by the tension of
by means of a draw spring in a position in which it is
the chain, a change in this position as the result of a
disengaged from a ratchet wheel of the ratchet device
decrease in the tension of the chain may also be employed 40 which is connected to the tightening spindle, while when
for instigating the chain-tightening operation.
the rocker is pivoted away, the shift rod will be drawn
In the above-mentioned copending application, a mech
by the spring against the ratchet wheel ‘and turn the same
anism of this kind has already been described, in which
in a step-by~step movement by means of a projecting
the change in position of the levers on which the tension
edge on the reciprocating shift rod.
shoes are mounted is employed for operatively connect 45
The objects, features, and advantages of the present
ing a ratchet wheel, which is mounted on the tightening
invention will become more clearly apparent from the
spindle, with a driving element which is actuated by one
following detailed description thereof which is to be read
of the transmission shafts. Such a mechanism is, how
with reference to the accompanying drawing, in which
ever, relatively expensive.
FIGURE 1 shows a side view of a cone pulley trans
It is an object of the present invention to provide a 50 mission without its housing according to a ?rst embodi
chain tightening mechanism of the above-mentioned type
ment of the invention;
which is much more simple and inexpensive than the
FIGURE 2 shows a plan view of the transmission
mechanism referred to above and which is likewise de
according to FIGURE 1;
signed for use in a transmission which is provided with
FIGURE 3 shows a cross section taken along line
tension shoes which are slidable under spring pressure on 55 III~—III of FIGURE 2;
the chain stringers. This object may be attained accord
FIGURES 4a to 4c show diagrammatic illustrations of
ing to the invention by mounting on each tension shoe a
different stages of the operation of parts of the mechanism
member with an inclined cam surface which, when the
according to FIGURES 1 to 3; While
tension of the chain decreases, presses upon a rod of a
FIGURE 5 shows a diagrammatic illustration of a
rocker, whereby this rocker is pivoted and releases a shift 60 second embodiment of the invention.
rod which is eccentrically mounted on the setting spindle
The in?nitely variable transmission as illustrated in
of the transmission which actuates a ratchet wheel which
FIGURES l to 3 has two transmission shafts 1 and 2
is mounted on the tightening spindle. By these means
which carry two pairs of conical pulley disks 3, 4 and
it is possible to initiate the tightening of the spindle in
5, 6, respectively, which are connected to each other by
65
such a manner that, when the transmission ratio of the
‘an
endless link chain 7. For varying the transmission
transmission is varied by the setting spindle, the tighten‘
ratio of the transmission, control levers ‘8 and 9 are
ing spindle will be turned until the rocker has returned
provided which ‘are pivotably mounted on tension blocks
to its original rest position, that is, until the cam surfaces
10 and 11 and are pivotably connected to threaded blocks
are disengaged from the rods which are mounted on the
on a setting spindle ‘14.
rocker. This does not occur until the chain has lifted
The tension blocks 10 and 11 carrying the control
the tension shoes pressing thereon, that is, until the chain
levers 8 and 9 are provided with screw threads with
3,097,540
3
opposite pitch directions which are screwed on a tighten
ing spindle 21 which, when turned in one direction, will
move the tension blocks 10‘ and ‘11 toward each other and
thereby tighten the chain 7. By turning the setting spindle
14 which is likewise provided with screw threads with
opposite pitch directions, the control levers 8 and 9 will
vary the axial distance between the conical disks 3 and
4 in one direction and simultaneously and to an equal
extent the axial distance between disks 5 and 6 in the
opposite direction so that the transmission ratio of the
transmission will thus be changed.
4
apart so that the cam surfaces 125 on the tension shoes
have also been disengaged from rod 124. The rocker is
therefore free and the nose 135 engages with the inclined
surface 137 of shift rod 129. Thus, possibly after a
further advance by one tooth, the parts are again in
their original position as shown in FIGURE 4a.
The same effect may also be attained if the movement
of the shift rod is not produced by the setting spindle but
by one of the shafts of the transmission. The main
shaft 2 then carries a worm 117 which drives the worm
wheel 119 at a highly reduced speed by means of drive
shaft 115 having worm wheel 116 in mesh with worm
117 and worm 114 and mesh with worm wheel 119.
This worm wheel 119 is freely rotatable on the setting
.18, respectively, which are pivotable about ?xed axes and
the outer ends of which are acted upon by a compression 15 spindle 14 and carries an eccentric 118 on which the
Tension shoes 15 and 16 which are slidable on the
two stringers of chain 7 are mounted on levers 17 and
spring 19 whereby the tension shoes 15 and 16 are con
stantly pressed against the two chain runs. As illustrated
in greater detail in FIGURES 4a to 40, a ratchet wheel
122 which is secured to the tightening spindle 21 is
actuated by a shift rod 129 which is secured eccentrically 20
on the setting spindle 14. A tightening movement is
started when one of the inclined cam surfaces 125 which
are provided on the tension shoes approaches the chain
shift rod 129 is mounted. When the main shaft 2 is
rotated, shift rod 129 will continuously carry out recipro
cating movements of a low frequency which may be
utilized in the manner as above described for retightening
the chain by means of a ratchet device 121.
Although my invention has been illustrated and de
scribed with reference to the preferred embodiments
thereof, I wish to have it understood that it is in no way
tightening spindle and thereby engages with and pushes
limited to the details of such embodiments, but is capable
rocker 123.
pended claims.
Having thus fully disclosed my invention, what I
back one of the rods ‘124 which are rigidly secured to a 25 of numerous modi?cations within the scope of the ap
This rocker which is loosely mounted on the
tightening spindle is thereby turned which causes the
shift rod 129 to drop down upon the ratchet wheel 122
as illustrated in FIGURE 4b. If the setting spindle ‘14
claim is:
1. In an in?nitely variable transmission having a hous
is then turned, shift rod 129‘ will engage with its edge 134 30 ing, a pair of transmission shafts rotatably mounted in
into the ratchet wheel 122 and turn the same in a step
said housing, two pairs of conical pulley disks within
said housing and each pair mounted on one of said shafts,
?exible
endless power transmitting means connecting said
turned and the chain be tightened. As long as the chain
two pairs of disks and adapted to travel between them
has a proper tension, shift rod 129 is in the position
as illustrated in FIGURE 4a, in which it engages with 35 under a certain tension, adjusting means comprising a
tightening spindle rotatably mounted in said housing cen
its recessed part 136 with the nose 135 of an adjustable
trally between and parallel to said shafts and a setting
setting element 132 which is connected to the rocker 123.
spindle rotatably mounted in said housing near one end
‘By the action of a spring 133, these parts will remain in
by-step motion whereby the tightening spindle will be
engagement until one of the cam surfaces 125 engages
thereof, both of said spindles having oppositely directed
upon one of rods ‘124.
is pivoted away to the position as illustrated in FIGURE
4b, shift rod 129 will slide off the nose 135 of the setting
element 132. After the chain has been tightened, the
cam surface 125 again disengages from rod 124 so that
said spindles and engaging with said threads thereof and
However, when the rocker 123 40 threads at opposite sides of the central plane of said
transmission, a pair of threaded members on each of
being movable in opposite directions along each spindle
when the same is turned, a pair of levers pivotably
rocker .123 will be drawn by spring 133 in the direction 45 mounted on said threaded members on said setting spindle
so that, when said setting spindle is turned, said levers
toward shift rod 129 until nose 135 engages with the
are
equally pivoted in opposite directions to each other
inclined surface 137 of the shift rod, as indicated in
about their pivot points on said tightening spindle to
FIGURE 40. Spring 133 insures that during a return
vary the transmission ratio of said transmission, a ratchet
movement of the shift rod, nose 135 will slide along the
inclined surface 137 until it enters into the notch 136 50 device comprising a ratchet wheel secured to said tight
ening spindle and a shift rod eccentrically mounted at
whereby the edge 134 of the shift rod is disengaged from
one end on said setting spindle so as to be reciprocated
the ratchet wheel v122. During the further movements
thereby when said setting spindle is turned and its other
of the shift rod, the same will not engage with the ratchet
end adapted to engage with the teeth of said ratchet wheel
Wheel until, when another expansion of the chain occurs,
one of the cam surfaces 125 will again engage with one 55 end thereby to turn said wheel and thus also said tight
ening spindle in one direction to tighten said transmitting
of the rods 124 and thereby pivot the rocker 123 out of
means, and means ‘for gauging the tension of said trans
its normal position.
mitting means and for controlling the operation of said
Assuming the direction of rotation of the setting
ratchet device comprising tension shoes, spring means
spindle 14 to be as indicated by the arrow 127, shift
for applying said tension shoes upon and in sliding en
rod 129 according to FIGURE 4a will carry out a com 60
g‘agement with one side of the two runs of said transmit
mon pivoting movement together with rocker 123 and its
ting means, a rocker pivotally mounted on said tightening
setting element 132. Edge ‘134 will then not engage into
spindle and in its normal position when said transmitting
ratchet wheel 122._ When the chain tension decreases,
means has an adequate tension being adapted to engage
the cam surfaces 125 of tension shoes 15 engage with
rod 124 of rocker 123 and swing the latter outwardly 65 w1th_sa1d shift rod to hold the same in its inactive posi
tion 1n.which it is disengaged from said ratchet wheel so
so that the shift rod, drawn by spring 133, will then
that said tightening spindle then remains stationary, and
engage into ratchet wheel 122. If the setting spindle
at least one cam member on and movable with at least
14 is adjusted in the direction of arrow 120, the ratchet
one of said tension shoes when the tension of said trans
wheel is therefore shifted by one tooth in the direction
of arrow 127. The end of this rotary movement is in 70 mitting means decreases whereby the position of said
tension shoe is changed accordingly, said cam member
dicated'in ‘FIGURE 4c. By the rotary movement of
then being adapted to engage with and to pivot said
setting spindle 14, the eccentric is then shifted to its
rocker about said tightening spindle and thereby to dis
outermost position and shift rod \129 has advanced the
engage said rocker ‘from said shift rod to permit the
ratchet wheel 122 by one tooth and has thus tightened
the chain, whereby the tension shoes 15 have been moved 75 latter to move to its active position, so that when said
5
3,097,540
setting spindle is turned, said shift rod can then engage
with and turn said ratchet wheel and thus also said
tightening spindle and thereby tighten said transmitting
means.
2. In an in?nitely variable transmission having a hous
ing, a pair of transmission shafts rotatably mounted in
said housing, two pairs of conical pulley disks within
6
spindle so that, when said setting spindle is turned, said
levers are equally pivoted in opposite directions to each
other about their pivot points on said tightening spindle
to vary the transmission ratio of said transmission, a
ratchet device comprising a ratchet wheel secured to said
tightening spindle and a shift rod eccentrically mounted
at one end on said setting spindle so as to be reciprocated
said housing and each pair mounted on one of said
thereby when said setting spindle is turned and its other
shafts, ?exible endless power transmitting means connect
end adapted to engage with the teeth of said ratchet
ing said two pairs of disks and adapted to travel between 10 wheel and thereby to turn said wheel and thus also said
them under a certain tension, adjusting means comprising
tightening spindle in one direction to tighten said trans
a tightening spindle rotatably mounted in said housing
mitting means, and means ‘for gauging the tension of
centrally between and parallel to said shafts and a set
said transmitting means and for controlling the operation
ting spindle rotatably mounted in said housing near one
of said ratchet gear comprising tension shoes, spring
end thereof, both of said spindles having oppositely 15 means for applying said tension shoes upon and in slid
directed threads at opposite sides of the central plane of
ing engagement with one side of the two stringers of
said transmission, a pair of threaded members on each of
said transmitting means, a rocker pivotably mounted on
said spindles and engaging with said threads thereof and
being movable in opposite directions along each spindle
said tightening spindle, a setting member adjustably
secured to said rocker near the outer end thereof and
when the same is turned, a pair of levers pivotably 20 adapted when said rocker is in its normal inactive posi
mounted on said threaded members on said setting spindle
tion when said transmitting means has an adequate ten
so that, when said setting spindle is turned, said levers
sion to engage with said shift rod to hold the same in
are equally pivoted in opposite directions to each other
its inactive position in which it is disengaged from said
about their pivot points on said tightening spindle to
ratchet wheel so that said tightening spindle then re
vary the transmission ratio of said transmission, a worm 25 mains stationary, at least one cam member on and mov
secured to one of said transmission shafts, a worm wheel
able with at least one of said tension shoes when the
on and rotatable relative to said setting spindle, worm
means connecting said worm and worm wheel to each
other so that said Worm wheel will be very slowly driven
tension of said transmitting means decreases, whereby the
position of said tension shoe is changed accordingly, said
when said transmission is in operation, a ratchet device
comprising a ratchet Wheel secured to said tightening
pivot said rocker about said tightening spindle and away
from said shift rod so as to disengage said setting mem
spindle, and a shift rod eccentrically mounted at one end
on said worm wheel and adapted to be reciprocated there
ber from said shift rod, so that when said spindle is
turned, said shift rod can then engage with and turn
cam member then being ‘adapted to engage with and to
by and its other end adapted to engage with the teeth of
said ratchet wheel and thus also said tightening spindle
said ratchet wheel and thereby to turn the latter and 35 and thereby tighten said transmitting means, and a ten
thus also said tightening spindle in one direction to tighten
sion spring connecting said rocker with said shift rod
said transmitting means, and means for gauging the ten
for holding said setting member in said disengaged posi
sion of said transmitting means and for controlling the
tion and for drawing said setting member into the opera
operation of said ratchet device comprising tension shoes,
tive engagement with said ratchet wheel when said rocker
spring means for applying said tension shoes upon and
is pivoted by said inclined member.
in sliding engagement with one side of the two runs of
4. In an in?nitely variable transmission having a hous
said transmitting means, a rocker pivotably mounted on
ing, a pair of transmission shafts rotatably mounted in
said tightening spindle and in its normal position when
said housing, two pairs of conical pulley disks within said
said transmitting means has an adequate tension being
housing and each pair mounted on one of said shafts, ?ex
adapted to engage with said shift rod to hold the same 45 ible endless power transmitting means connecting said
in its inactive position in which it is disengaged from
two pairs of disks and adapted to travel between them
said ratchet wheel so that said tightening spindle then
under a certain tension, adjusting means comprising a
remains stationary, and at least one cam member on and
tightening spindle rotatably mounted in said housing cen
movable with at least one of said tension shoes when
trally between and parallel to said shafts and a setting
the tension of said transmitting means decreases whereby 50 spindle rotatably mounted in said housing near one end
the position of said tension shoe is changed accordingly,
said cam member then being adapted to engage with and
to pivot said rocker about said tightening spindle and
thereby to disengage said rocker from said shift rod to
thereof, both of said spindles having oppositely directed
threads at opposite sides of the central plane of said trans
mission, a pair of threaded members on each of said
spindles and engaging with said threads thereof and be
permit the latter to move to its active position, so that 55 ing movable in opposite directions along each spindle when
said shift rod can then engage with and turn said ratchet
the same is turned, a pair of levers pivotally mounted on
wheel and thus also said tightening spindle and thereby
said threaded members on said setting spindle so that,
tighten said transmitting means.
when said setting spindle is turned, said levers are
3. In an in?nitely variable transmission having a hous
equally pivoted in opposite directions to each other about
ing, a pair of transmission shafts rotatably mounted in 60 their pivot points on said tightening spindle to vary the
said housing, two pairs of conical pulley disks within said
transmission ratio of said transmission, a worm secured
housing and each pair mounted on one of said shafts,
to one of said gear shafts, a worm wheel on and rotatable
?exible endless power transmitting means connecting said
relative to said setting spindle, worm means connecting
two pairs of disks and adapted to travel between them
said worm and worm wheels to each other so that said
under a certain tension, adjusting means comprising a 65 worm Wheel will be very slowly driven when said gear is
tightening spindle rotatably mounted in said housing cen
in operation, a ratchet gear comprising a ratchet wheel
trally between and parallel to said shafts and a setting
secured to said tightening spindle, and a shift rod eccen
spindle rotatably mounted in said housing near one end
tricaltly mounted at one end on said worm wheel and
thereof, both of said spindles having oppositely directed
adapted to be reciprocated thereby and its other end
threads at opposite sides of the central plane of said 70 adapted to engage with the teeth of said ratchet wheel
transmission, a pair of threaded members on each of
and thereby to turn the latter and thus also said tightening
said spindles and engaging with said threads thereof and
spindle in one direction to tighten said transmitting means,
being movable in opposite directions along each spindle
and means for gauging the tension of said transmitting
when the same is turned, a pair of levers pivotably
means and for controlling the operation of said ratchet
mounted on said threaded members on said setting 75 device comprising tension shoes, spring means for apply
3,097,540
ing said tension shoes upon and in sliding engagement with
said setting member from said shift rod, so that said
one side of the two runs of said transmitting means, a
shift rod can then engage with ‘and turn said ratchet wheel
rocker pivotably mounted on said tightening spindle, a
setting member adjustably secured to said rocker near the
outer end thereof ‘and adapted when said rocker is in its
normal inactive position when said transmitting means
has an adequate tension to engage with said shift rod to
said transmitting means, ‘and a tension spring connecting
said rocker with said shift rod for holding said setting
member in said disengaged position and for drawing said
hold the same in its inactive position in which it is dis
engaged from said ratchet wheel so that said tightening
spindle then remains stationary, at least one cam member 10
on and movable with at least one of said tension shoes
when the tension of said transmitting means decreases,
whereby the position of said tension shoe is changed
accordingly, said cam member being then adapted to
engage with and to pivot said rocker about said tightening 15
spindle and away from said shift rod so as to disengage
and thus also said tightening spindle ‘and thereby tighten
setting member into the operative engagement with said
ratchet wheel when said rocker is pivoted by said inclined
member.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,112,157
2,266,687
Hatcher ______________ __ Mar. 22, 1938
Keller ______________ __ Dec. 16, 1941
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