Improved Transmission Gear for Revolving Shafts of Machinery or Road Vehicles.
Year: 1896

page_text: Date of Application, 20th Aug., 1896
Complete Specification Left, 15th Apr.. 1397-Accepted, 15th May, 1897
PROVISIONAL SPECIFICATION.
Improved Transmission Gear for Revolving Shafts of Machinery or
Road Vehicles.
I, HEINRICH ERRHARDT, of 20 Reichstrasse Dilsseldorf, Germany, Civil Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object to enable the speed of machinery or vehicles to bo
varied by a ready and oasy alteration of the ratio of transmission.
I will describe the said invention with reference to the accompanying drawings.
The driven shaft was also the driving shaft to have each a disc e and a
Figs. 1 and 2, having at different distances from the centre circular rows of holes for
the pins of pin wheels to gear into.
With the disc a Fig. 1 gears the pin wheel b on the shaft o, by means of which the
latter is driven. At the other end of the shuft c is fixed the pin wheel d which gears
with the holes of the disc e which is thus driven thereby.
For varying the ratio of transmission, and consequently the speed of the driven
shaft, the two pin wheels are withdrawn from the discs either by turning the shaft o
on excentric bearings or by other suitable means, and the shaft is then shifted
longitudinally somewhat, in one direction or the other after which the pin wheels are
nade to gear with another ring of holes of the discs.
Thus the one pin wheel being engaged at an increased distance from the centre of
its disc, while the other pin wheel is engaged at a smaller distance from the centre
of the other disc the ratio of transmission will be correspondingly altered, so that
by providing a suitable number of rings of holes on each diso, the ratio of transmission
can be varied between wide limits, so as to obtain any desired speed for the driven shaft.
For effecting a still greater variation of speed, the pin wheels d and b can also be
so arranged thuit their distance from each other can be varied, whereby intermediate
ratios of transmission can be obtained. Such alteration of the distance between the
pin wheels can be effected in various ways, thus Figs. 3 and 4 shew the pin wheels
mounted on a telescopic sbaft.
Figs. 5 and 6 shew an arrangement in which the disengagement of the pin wheels
from the discs is effected by turning the shaft of the former partly round a central
point. Of course the arrangement may be such that only one of the pin wheels is
made shiftable.
Dated this 20th day of Anunst 1896.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Transmission Gear for Revolving Shafts of Machinery or
Road Vehioles.
1, HEINRICH EHRHARDT, of 20 Reichstrasse, Düsseldorf, Germany, Civil 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 :-
This invention has for its object to enable the speed of machinery or vehicles to be
varied by a ready and easy alteration of the ratio of transmission.

page_text: I will describe the said invention with reference to the drawings accompanying my
Provisional Specification.
The driven shaft was also the driving shaft to have each a disc e and a
Figs. 1 and 2 having at different distances from the centre circular rows of holes for
the pins of pin wheels to gear into.
With the disc a Fig. 1 gears the pin wheel b on the shaft e by means of which the
latter is driven. At the other end of the shaft c is fixed the pin wheel d which gears
with the holes of the disc e which is thus driven thereby.
For varying the ratio of transmission and consequently the speed of the driven
shaft, the two pin wheels are withdrawn from the discs either by turning the shaft c
on excentric bearings or by other suitable means, and the shaft is then shifted
longitudinally somewhat, in one direction or the other after which the pin wheels are
made to gear with another ring of holes of the discs. Thus the ono piu wheol being
engaged at an increased distance from the centre of its disc, while the other pin
wheel is engaged at a smaller distance from the centre of the other disc, the ratio of
transmission will be correspondingly altered, so that by providing a suitable number
of rings of holes on each disc, the ratio of transmission can be varied between wide
limits, so ns to obtain any desired speed for the driven shaft.
For effecting a still greater variation of speed, the pin wheels d and b can also be
so arranged that their distance from each other can be varied, whereby intermediate
ratios of transmission can be obtained. Such alteration of the distance between the
pin wheels can be effected in various ways; thus Figs. 3 and 4 shew the pin wheels
mounted on a telescopic shaft.
Figs. 5 and 6 shew an arrangement in which the disengagement of the pin wheels
from the discs is effected by turning the shaft of the former partly round a central
point. Of course the arrangement may be such that only one of the pin wheels is
made shiftable.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Transmission gear for imparting variable speeds to revolving shafts of machinery
or road vehicles, wherein pin wheels at or near each end of a shaft are engaged with
two discs having circular rows of holes at different distances from their centres into
which the pins of the wheels take so as to transmit the rotary motion from the one
diso to the other one, the pin wheels and their shaft being so arranged that they can
readily be moved out of gear with the discs and shifted so as to cause the pin wheels
to engage with different rows of holes of the discs and thus vary the ratio of
transmission substantially as described.
2. In transmission gear such as is referred to in the first claim, arranging the
pin wheels on their shaft in such manner that the distance between them can be
altered, so as thereby still farther to vary the ratio of transmission, substantially as
described.
Dated this 15th day of April 1897
ABEL & IMRAY,
Agents for the Applicant.