Improved Change Speed Gear for Motor Vehicles.
Year: 1897

page_text: Date of Application, 26th Nov., 1897
Complete Specification Loft 26th Aug 1808 Accented
15th Oct
1808
PROVISIONAL SPECIFICATION.
Improved Change Speed Gear for Motor Vehicles.
I, JULES LOUIS DIDIER, of 26, Parc Montretout, St. Cloud, (Seine et Oise),
France, Engineer, do hereby declare the nature of this invention to be as
follows:
This invention relates to change speed gear applicable to motor cars and
particularly to motor tricycles. It comprises essentially a train of reducing
gear so mounted as to be adapted to be brought instantly into connection with
the motor of the tricycle or motor car for the transmission of motion when it is
required to obtain increased power at the expense of speed as in mounting a hill
for example.
The invention is illustrated in the accompanying drawings forming part of
this specification wherein Figures 1 and 2 are elevations of the change speed gear
and Figure 3 shews its application to a motor tricycle. Figure 4 shews a
modification for enabling the change of speed to be made whilst running. The
same letters of reference denote like parts in all the figures.
The train of reducing gear comprises a toothed wheel a loose on axis b and
in gear with a pinion c loose on an axis d and in one with another pinion e which
transmits motion at a reduced velocity to the gear wheel 1. The axes 6 and d
are mounted in a bracket f adapted to be readily mounted on the motor. The
bracket is fixed at its upper end by two bolts to a part of the frame of the
tricycle for instance the draught yoke frame g in the case when a small carriage
is to be hauled by the motor tricycle, and presents at its lower part a tenon h
adapted to be bolted to one of the wings of the motor, the proper relative positions
of band being also ensured by the link j.
The speed reducing gear thus constitutes a removable mechanism capable of
being applied to the motor when it is required to convert velocity into force.
When applied in position the pinion of the motor driving shaft gears with the
toothed wheel of the reducing train, the pinion k being for this purpose slightly
shifted on its axis so as to be no longer directly in gear with the wheel 1. The
wheel then transmits motion at a lower velocity to pinion and pinion e in
one therewith transmits this motion at a still lower velocity to the wheel l.
The bracket also carries two lubricators for constantly oiling the axes b
and d.
Figure 4 shews the mechanism adapted to be brought into action whilst running.
Loose on the motor shaft are mounted two pinions one k directly in gear with
wheel and the other k¹ with the wheel a. Between the pinions k¹ is a clutch n
operated by a lever or any other convenient means within reach of the driver, the
clutch being in sliding connection with shaft but turning therewith, and adapted
to engage either with pinion kor k¹ according as it is desired to obtain the reduced
or normal speed. In this arrangement the link j may be replaced by a second
bracket frame f so that the axes b d will be supported at both ends.

page_text: The change speed gear although primarily intended for motor tricycles may
be applied to the motors of other auto-motive vehicles, the construction and
arrangement of the gear being modified accordingly.
Dated this 26th day of November 1897.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
Improved Change Speed Gear for Motor Vehicles.
I, JULES LOUIS DIDIER, of 26, Parc Montretout, St. Cloud, (Seine et Oise),
France, 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 relates to change speed gear applicable to motor cars and
particularly to motor tricycles. It comprises essentially a train of reducing gear
so mounted as to be adapted to be brought instantly into connection with the
motor of the tricycle or car for the transmission of motion when it is required
to obtain increased power at the expense of speed as in mounting a hill for
example.
In the accompanying drawings
Fig. 1 is a side elevation of the gear applied to a motor,
Fig. 2 is an end elevation of the gear showing the means of attachment to the
motor.
Fig. 3 is a rear elevation of a modified form of speed-change gear.
Like letters indicate like parts throughout the drawings.
Referring first to Figures 1 and 2, A is a pinion fast upon the motor shaft A¹
and gears, under ordinary circumstances with the wheel B by which the power is
transmitted to the vehicle.
In applying the speed reducing gear the pinion A is moved along the shaft A'
so that it may no longer be in direct gear with the wheel B but is brought into
gear with the same through the medium of a train of wheels. This train comprises
a wheel gearing with a second wheel and free to revolve upon an axle C³.
The wheel C has a pinion Cattached and is free to revolve upon an axle C".
The axles C. C are carried by a frame 1) which may conveniently be bolted to
a web of the motor crank-chamber, as at I)', their proper relative positions being
also ensured by a link D². The upper part of the frame 1) may be bolted to a
plate 13 secured in turned to some convenient part of the vehicle.
The speed reducing gear thus constitutes a removable mechanism capable of
being applied to the motor when it is required to convert velocity into force.
When fixed in position the pinion A of the motor driving shaft Al gears with the
toothed wheel C of the speed reducing train which in turn gears with the wheel C
and the pinion (3 being attached to the latter transmits motion at a reduced
velocity to the large wheel B with which it gears.
Two lubricators E, E carried by a bracket F bolted to the frame D and plate D³,
constantly oil the axles (2 04.
Figure 3 shows the mechanism adapted to be brought into action whilst running.
The pinion A in this case is duplicated and mounted loose on the motor shaft A¹
The part A2 of the pinion A is continuously in gear with the wheel B whilst
the part .A³ is continually in gear with the speed reducing train comprising the

page_text: wheel CC and pinion C³ gearing with the wheel B as before. Between the
parts A and A³ is a clutch A operated by a lever, or any other convenient means,
within reach of the driver, the clutch being in sliding connection with the shaft A
but turning therewith and adapted to engage either with the part A2 or A³ accord-
ing as it is desired to obtain the reduced or normal speed. In this arrangement
the links I may be extended to form a bracket capable of being bolted, as at 14,
to a web of the motor crank chamber and forming a bearing 5 for the end of the
shaft A. The bracket thus formed will also have the effect of further strengthen-
ing the axles C³0%.
The lubricators are not shown in this figure.
The change speed gear although primarily intended for motor tricycles may
be applied to the motors of other automotive vehicles, the construction and
arrangement of the gear being modified accordingly.
Having now particularly described and ascertained the nature of the said.
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. The complete detachable speed-reducing gear arranged and operating sub-
stantially as described and illustrated in Figures 1 and 2 of the accompanying
drawings.
2. The complete change-speed gear arranged and operating substantially as
described and illustrated in the accompanying drawings.
Ddad this with day of August 1898
BOULT & WADE,
Agents for the Applicant.