Improvements in and relating to Speed-changing Mechanisms.
Year: 1895

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Speed-changing Mechanisms.
I, WILHELM LORENZ, Kriegstrasse 57, of Karlsruhe, in the Grand Duchy of
Baden, German Empire, Engineer and Counsellor of Commerce, 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:-
This invention relates to a toothed wheel-work, in which a small ordinary cog-
wheel with outer toothing and a large cog-wheel with inner toothing co-operate
with a ring-like wheel which is provided with an outer toothing and with an inner
one, too; said double-toothed ring is arranged excentrically with regard to the two
cog-wheels, in such a manner, that the small cog-wheel gears with the inner toothing
of the said ring, whilst the large cog-wheel gears with the outer toothing of the
same.
My invention may be applied to machines, devices and apparatus of all sorts,
provided, there be a necessity of increasing or decreasing rotatory motion according
to a special requirement; therefore, the forms of construction shown in the
accompanying drawing need merely be regarded as examples.
Referring to Figs. 1 and 2, a desiguates the small cog-wheel afore mentioned,
which in this case is fixed to the boss of the loose cone-pulley c of a lathe, said boss
carries a loose disk d. The latter takes with a suitable central recess over said
cog-wheel a, and is moreover provided with a deep, annular, eccentric groove for
the reception of the double-toothed ring e. There are by said recess and said groove
formed upon the loose disk d two projections d' d² of half-moon-like configuration ;
these projections as well as the double-toothed ring e are taken over by the cog-
wheel, which is furnished with inner toothing, and is fixed to the mandril b.
The toothed ring e is held in position by a flat annular disk fixed to the main-
disk ; the latter may in its turn be held fast by a wedge i, or any other equivalent
or suitable device.
If the disk d is fixed in place, and the cone-pulley c is caused to rotate upon the
mandril the motion will be transmitted from the cog-wheel a to the cog-wheel f
through the mediation of the toothed ring e. Owing to the greater diaineter of said
ring with regard to the cog-wheel a on one side, and of the cog-wheelf with regard
to the said ring on the other side the velocity will twice be decreased, the degree
of decrease being in an inverse ratio to the ratio in circumference of the three parts
in question.
If, however, rotatory motion is to be transmitted not from the cone-pulley c to the
mandril b, but from the latter to said cone pulley, it will without further explanation
be clear, that the velocity will not be decreased but increased.
If, finally, the disk d is set free, there will be neither a decrease nor an increase
in velocity, especially if the toothed ring e is coupled with one or the other of the
two cog-wheels.
The large cog-wheel (f, Figs. 1 & 2) need not indispensably be fixed to the
mandril, but may be loosely arranged on the same; in such a case, said large cog-
wheel is formed into or made integrally with, a pulley, such as fi in Figs. 3 & 4.
In Fig. 3 said pulley is supposed to be arranged on a shaft of a machine requiring
a slow rotation, but a powerful effect, of said shaft. In Fig. 4, the said pulley is
supposed to be arranged upon the driving-shaft of an engine having a slow
rotatory motion of its crank or cranks (not shown) but a quick ro:ation of the
nulley1

page_text: The large cog-wheel may, as a matter of course, be formed into, or made integrally
with, a pulley, as shown at f2 in Fig..5.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performned, I declare that what [
claim is :-
:-
1. As a means for decreasing or increasing the velocity of rotary motion on
transmitting it from one pulley or shaft or similar rotatable part to another pulley
or-shaft or similar rotatable part, the combination with a toothed wheel connected
_with the driving part, and with another toothed wheel connected with the driven
part, of an annular double-toothed wheel embracing the shaft of either said driving
or said driven part, and arranged excentrically to both the said parts so as to have
one of its toothings in gear with the driving part, and the other of said toothings in
gear with the driven part, the places of gear being diametrically opposite with
regard to the shaft embraced by said annular wheel, substantially as described.
2. As a means for decreasing or inereasing the velocity of rotary motion on
transmitting it from one pulley or shaft or similar rotatable part to another pulley
or shaft or similar rotatable part, the combination with a cog-wheel having outer
toothing, and connected either with the driving or the driven part, and with another
cog-wheel having inner toothing, and connected with the other of said two parts,
of an annular cog-wheel having outer as well as inner toothing, embracing the shaft
of the first-named cog-wheel, and arranged eccentrically to said shaft so as to have
its inner toothing in gear with said first-named cog-wheel, and its outer toothing in
gear with the second cog-wheel, the places of gear being arranged diametrically
opposite with regard to the shaft embraced by said annular wheel, substantially as
described.
means for decreasing or increasing the velocity of rotary motion on
transmitting it from one pulley or shaft or similar rotatable part to another pulley
or shaft or similar rotatable part, the combination with a cog-wheel having outer
toothing, and connected either with the driving or the driven part, and with another
cog-wheel having inner toothing, and connected with the other of said two parts, of
an annular cog-wheel having outer as well as inner toothing, embracing the shaft
of the first-named cog-wheel, and arranged eccentrically to said shaft so as to have
its inner toothing in gear with said first-named cog-wheel, and its outer toothing in
gear with the second cog-wheel, the places of gear being arranged diametrically
opposite with regard to the shaft embraced by said annular wheel, the latter being
beld within a groove of a disk arranged loosely upon said shaft, substantially as
described.
3. As a
Dated this 15th 1
1
1005
F. BOSSHARDT & Co.,
4 Corporation Street, Manchester, Agents for the Applicant.