Differential Friction-wheels with Inside-gearing and Spring-pressure for Variable Transmission of Motion.
Year: 1890

page_text: Date of Application, 5th Apr., 1890
Complete Specification Left, 5th Jan., 1891-Accepted, 7th Mar., 1891
PROVISIONAL SPECIFICATION.
Differential Friction-wheels with Inside-gearing and Spring-pressure
for Variable Transmission of Motion.
I, EMIL KOCH, of 32, Lothringer Strasse, Berlin, N., in the Kingdom of Prussia,
German Empire, Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of my invention' is to get variable transmitting of rotary motion
from one shaft to another by employing two friction-wheels, one of which is formed
as a hollow conical wheel and moveable in the direction of its axle towards the
other wheel, pressed against its internal side by means of a lever and a spring.
The hollow wheel is connected with the driving shaft, the construction allowing
however also a gearing in inversed direction.
The mechanism is illustrated in the accompanying drawing, in which similar
letters denote similar parts throughout the several views.
Figs. 1 and 2 are vertical sections,
Fig. 3 is a top 'view,
Fig. 4 is a sectional view, while the other figures represent details of the
mechanism:
The hollow wheel M is fixed upon the shaft w turnable in the plummer-block L
(Figs. 1 to 4) and gears internally with the wheel S which on the left is provided
with an annular part r. This part is connected with the ring R by the pivots z
and the screws & in such a manner that risenabled to oscillate about its vertical
axis, while the pivots and the screws s¹ connect the ring R on its side with the
plummer-block L', thus allowing R to turn about its horizontal axis. It is evident
that by this arrangement a universal joint has been constructed between L' and M.
The ring 'r carries the bow K' with the lever H, the end of which is turnable in the
plummer-block l. lis moveable placed between the guiding-bars i, which are fixed
upon the wheel and shaft w'and 'held in' position by the click' n pressed against / by
means of the spring F and' of the barrel t. The trunnion q, the ratchet-wheel p,
the click e and the spring serve for bending the spring F, and G is a
counterweight placed vis à vis to the barrel t. The plummer-block L is formed as
sledge and is moveable about the guiding bars C' by means of the levers g and k,
the latter of which can be fixed upon the bow D by the binding-screw .
The mechanism works in the following manner:
When F is bent, the barrel t'will press the click n upon 1 and thus force the
lever-arm H to nove downwards, while the wheel S is pressed against the upper
internal side of t.ie hollow wheel M (Figs. 1 and 2).
By making hal a 'revolution, the shaft w will induce the dotted position of the
mechanism and force the wheel S to roll with half its circumference upon the inside
of the wheel M, in such a manner that the latter by means of the friction between
Sand Mwill be driven forwards and the rotation correspond to the difference' of
the half peripheries. This the shaft W' will turn a little.
As M has a conical shape the difference of the peripheries is variable' by 'moving
the plummer-block L trward or backward.
Figs. 1 and 2 show that position of the lever k, which induces the greatest
difference and Figs. 3 and 4 represent the least difference of 'the peripheries, so
that in the former figures the shaft W will turn with a greater velocity than in the
látter figures.
It is clear, that the shaft W'will uniformly move, when by the shaft w a uniform
motion is transmitted and that by 'converse the shaft w will uniformly turn, when
the shaft W transmits a uniform rotation, in such a manner that in the former' case

page_text: the motion will be retarded and in the latter case accelerated. The degree of
transmission corresponds to the difference of the half peripheries of the friction-
wheels and can be varied by means of the lever k also when the engine is at
work.
The easy gearing of the mechanism essentially depends on the length of the
lever HS as the friction of the shaft w will diminish in the same degree as the
lever is lengthened.
By Rayner & Cassell,
EMIL KOCH.
37, Chancery Lane, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Differential Friction-wheels with Inside-gearing and Spring-pressure
for Variable Transmission of Motion.
I, EMIL KOCH, of 32, Lothringer Strasse, Berlin, N., in the Kingdom of Prussia,
German Empire, Engineer, do hereby declare the nature of this invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The object of my invention is to get variable transmitting of rotary motion from
one shaft to another by employing two friction-wheels, one of which is formed as a
hollow conical wheel and moveable in the direction of its axle towards the other
wheel, pressed against its internal side by means of a lever and a spring. The
hollow wheel is connected with the driving shaft, the construction allowing however
also a gearing in inversed direction.
The mechanism is illustrated in the drawing sent in with Provisional Specifica-
tion, in which similar letters denote similar parts throughout the several views:
and in which:
Figs. 1 and 2 are vertical sections,
Fig. 3 is a top view,
Fig. 4 is a sectional view, while the other figures represent details of the
mechanism.
The hollow wheel M is fixed upon the shaft w turnable in the plummer-block L
(Figs. 1 to 4) and gears internally with the wheel S which on, the left is provided
with an annular part r. This part is connected with the ring R by the pivots z and
the screws s in such a manner, that is enabled to oscillate about its vertical axis,
while the pivots and the screws s² connect the ring R on its side with the
plummer-block L', thus allowing R to turn about its horizontal axis. It is evident
that by this arrangement a universal joint has been constructed between L' and M.
The ring carries the bow with the lever H, the end of which is turnable in the
plummer-block l. 7 is moveably placed between the guiding bars i, which are fixed
upon the wheel and shaft w and held in position by the click n pressed against / by
means of the spring F and of the barrel t. The trunnion q, the ratchet-wheel p,
the click e and the spring serve for winding the spring F, and G is a counter-
weight placed vis à vis to the barrel t. The plummer-block L is formed as sledge
and is movable about the guiding bars C by means of the levers g and k, the latter
of which can be fixed upon the bow D by the binding-screw v.
The mechanism works in the following manner :-
l
When F is wound, the barrel t will press the click n upon and thus force the
lever-arm H to move downwards, while the wheel S is pressed against the upper
internal side of the hollow wheel M (Figs. 1 & 2).
By making half a revolution, the shaft w will induce the dotted position of the
mechanism and force the wheel S to roll with half its circumference upon the
inside of the wheel M, in such a manner, that the latter by means of the friction
between S and M will be driven forwards and the rotation correspond to the
difference of the half peripheries. Thus the shaft W will turn a little.

page_text: As M has a conical shape the difference of the peripheries is variable by moving
the plummer-block L forward or backward.
Figs. 1 & 2 show that position of the lever k, which induces the greatest
difference and Figs. 3 & 4 represent the least difference of the peripheries, the
shaft W will turn with a greater velocity in the former figures than in the latter
figures.
It is clear that the shaft W will uniformly move, when by the shaft to a uniform
motion is transmitted and that by converse the shaft w will uniformly turn, when the
shaft W transmits a uniform rotation, in such a manner that in the former case the
motion will be retarded and in the latter case accelerated. The degree of trans-
mission corresponds with the difference of the half peripheries of the friction-wheels
and can be varied by means of the lever k also when the engine is at work.
The easy gearing of the mechanism essentially depends on the length of the
lever HS as the friction of the shaft w will diminish in the same degree as the
lever is lengthened.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
In a differential friction-wheel work with inside gearing and spring-pressure:
1. The arrangement for variable transmission of motion between shafts W and w,
in combination with the hollow wheel M, the latter being attached to shaft W and
adapted to be axially displaced, for the purpose as described.
2. The arrangement for variable transmission of motion between shafts W and w,
in combination with the wheel S of smaller diameter than wheel M, and sitting on
lever H, the latter having its bearing in a cross-hinge for the purpose as
described.
3. The arrangement for variable transmission of motion between shafts W and w,
in combination with a spring case on shaft w, pressing wheel S against the hollow
wheel M, by means of lever H, for the purpose as described.
Dated this 5th day of January 1891.
EMIL KOCH.
By Rayner & Cassell,
Agents for the Applicant.