IMPROVEMENTS IN THE TRANSMISSION OF ROTARY MOTION
Year: 1876

page_text: LETTERS PATENT to Carl Pieper, of Dresden, Saxony, for the Invention of
"IMPROVEMENTS IN THE TRANSMISSION OF ROTARY MOTION." A communi-
cation from Vital Daelen, residing at Berlin, Prussia.
Sealed the 17th April 1877, and dated the 23rd October 1876.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 23rd October 1870.
CARL PIEPER, of Dresden, Saxony. "IMPROVEMENTS IN THE TRANSMISSION OF
ROTARY MOTION." A communication from Vital Daelen, residing at Berlin,
Prussia.
The transmission of rotary motion by belts, wire ropes, or the like, has the incon-
venience that power is constantly lost by the slipping of the said belts or ropes.
The use of chains instead has shewn other difficulties and proved impossible for
high velocities, while connecting rods and other dispositions do not allow a discon-
nection of the machines in motion.
I have invented a new device, by which the transmission of motion from the pulley
of the driving shaft to the pulley of the driven shaft is effected by means of end-
less metal belts provided with driving teeth. Into the crown of a pulley recesses of
the form of the driving teeth are drilled in equal distances on the outer surface
called driving holes. The teeth are provided with round washers and rivetted to
the metal belt. The distance of the centres of two teeth is exactly equal the length
of arch from the middle of one driving hole to the next, while in motion the driving
teeth engage one after the other into the driving holes, and leave them after half a
revolution on the opposite side, thereby transferring the motion without inter-
ruption.
The common belt as it is generally in use would slide when a sudden impulse is
given to the driving shaft, but the new device will move the working machinery
with exactly the same velocity as the shafting and without any loss of power.
Here of course the device is intended for a continual motion in one or the other
direction without any throwing out of gear, but by a suitable arrangement of the
metal belts and driving teeth the rotary motion may be transferred with or without
loss by slipping, allowing the mechanism to work solely by means of friction or by

page_text: means of the teeth, and can also be applied to cases where it is required to lead the
belt from the fast pulley to the loose one, while the machine is in motion.
At the side of the pulley a clutch is provided which sliding on the shaft manages
to advance or retire the driving teeth, which here in form of belts are lodged
radially in bushes round the crown and hob of the pulley in equal distances.
The belt here consists of two bands of metal, one aside of the other, leaving some
space between to allow the driving bolts to enter, and connected firmly to one
another by riders rivetted on the bands. The inner side of the bands are lined
with a material which produce more friction, as leather, rubber or the like fastened
to the metal either by pasting on or by rivetting. If the clutch by means of a lever
is moved from the hob, all driving teeth will advance in radial direction, and engage
behind the riders so as to avoid any slipping of the belt.
Applying my Invention on a transmission of motion by wire ropes I should give
to the driving teeth the form of rings or bushes firmly connected to the rope in
equal distances, and falling into corresponding recesses on the crown of the rope
pulley.
If it be desirous to transfer motion by means of my new arrangement exclusively
by friction, as it is the case when using common belts, the driving teeth with the
disposition of their throwing into and out of gear may be dispensed with, and in
this case the pulleys will be connected by endless metal belts, the inside of which
being lined with leather, rubber, or similar material rivetted or glued to the metal as
already mentioned above to increase friction.
Just as well the crown of the pulleys might be covered with leather, rubber, or
the like, and the metal belts may be led over them naked to arrive at the same
purpose.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 23rd April 1877.
CARL PIEPER, of Dresden, in the Kingdom of Saxony. "IMPROVEMENTS IN THE
TRANSMISSION OF ROTARY MOTION." A communication from Vital Daelen, residing
at Berlin, in the Kingdom of Prussia.
The transmission of rotary motion by belts, wire ropes, &c., has the inconvenience
that power is constantly lost by the slipping of the said belts or ropes. The use of
chains instead has shown other difficulties and proved impossible for high velocities,
while connecting rods and other dispositions do not allow a disconnection of the
machines in motion.
I have invented a new device, by which the transmission of motion from the
pulley of the driving shaft to the pulley of the driven shaft is effected by means of
endless metal belts, provided with driving teeth as represented on the accompanying
Drawings.
Fig. I and II. represent one half of a pulley E with a metal belt A in elevation
and section; Fig. III. shows the top view of the driving teeth B. Into the crown
of the pulley E, recesses D of the form of the teeth B are drilled in equal distances
on the outer surface called driving holes. The teeth B are provided with round
washers C and riveted to the metal belt A. The distance of the centers of two
teeth B is exactly equal in length of arch from the middle of one driving hole D to
the next. While in motion the driving teeth B engage one after the other into the
driving holes D, and leave them after half a revolution on the opposite side, thereby
transferring the motion without interruption.
The common belt as it is generally in use would slide when a sudden impulse is
given to the driving shaft, but the new device will move the working machinery
with exactly the same velocity as the shafting, and without any loss of power.
Here of course the device is intended for a continual motion in one or the other
direction without any throwing out of gear, but by a suitable arrangement of the

page_text: metal belts and driving teeth the rotary motion may be transferred with or without
loss by slipping, allowing the mechanisme to work solely by means of friction or by
means of the teeth.
The construction of this device is represented in Figures 4 to 7 of the Drawings,
and can also be applied to cases where it is required to lead the belt from the fast
pulley to the loose one, while the machine is in motion.
The pulley G and the belt A is shown in section (Fig. 4), and on the left hand
side the clutch F with the disposition of levers H is adapted to engage or disengage
the driving teeth E; Fig. 5 shows a side elevation of the pulley with belt and
clutch without the lever arrangement; Fig. 6 and 7 represent the form of the
riders B to be hereafter described in a top view and section.
On the inner side of the pulley crown in equal distances bushes D are provided,
and opposite to them on the hub an equal number to guide the driving teeth or
driving bolts E, when they are pushed forward and backward radially by the
clutch F and the lever arrangement H. The belt A here consists of two bands of
metal, one aside of the other, leaving some space between to allow the driving bolts
to enter, and connected firmly to one another by the riders B and the rivets C. The
inner side of the bands are lined with a material which produces more friction, as
leather, rubber, &c., fastened to the metal either by pasting on or by rivetting. If
the clutch F by means of a lever H is pushed towards the hob of the pulley, the
driving teeth E will go back radially far enough, that the device can work only by
friction of the belt on the pulley and that the belt may be led over to a loose pulley
as it is usually done by a fork with common belts. The position of the clutch F
and the driving teeth E is indicated on Fig. 4 in dotted lines.
If the clutch F by means of the lever H is moved from the hub all driving
teeth E will advance in radial direction, and engage behind the riders B so as to
avoid any slipping of the belt.
Applying my Invention on a transmission of motion by wire ropes, I should give
to the driving teeth the form of rings or bushes firmly connected to the rope in equal
distances, and falling into corresponding recesses on the crown of the rope pulley.
If it be desirous to transfer motion by means of my new arrangement exclusively
by friction, as it is the case when using common belts, the driving teeth with the
disposition of their throwing into and out of gear may be dispensed with, and in
this case the pulleys will be connected by endless metal belts, the inside of which
being lined with leather, rubber, or similar material rivetted or glued to the metal
as already mentioned above to increase friction. Just as well the crown of the
pulleys might be covered with leather, rubber, &c., and the metal belts may be led
over them naked to arrive at the same purpose.
Having thus fully described my said Invention and the manner of performing the
same, I wish it understood that I claim as my Invention,-
1. The transmission of the rotary motion by endless metal belts provided with
driving teeth or driving riders, substantially as herein set forth.
2. The characteristic quality of the device to use it either by friction alone or by
means of the driving teeth, substantially as herein-before described and represented
by the Drawings.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Twenty-third day of March, in the year of our Lord One thousand
CARL PIEPER. (L.S.)