Improvements in Gear for Reversing and Speeding Tram Cars and other Locomotives.
Year: 1893

page_text: Date of Application, 8th June, 1893
Complete Specification Left, 7th Mar., 1894-Accepted. 19th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Gear for Reversing and Speeding Tram Cars and
other Locomotives.
I, HENRY PERCY HOLT, of No. 10 St. Bride Street, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to means of readily altering the direction and speed of a
tramcar or other locomotive while the direction and speed of the motor remains
unchanged. For this purpose, I fix on the shaft driven by the motor, which may
be a gas or other engine, or an electromotor, a drum carrying a belt which, when
tightened, drives a drum on a countershaft, which countershaft by chain or belt or
other suitable connecting gear, drives one of the running axles of the vehicle.
The countershaft is mounted in bearings which can be slid or moved radially so as
to slacken the belt and to bring the two drums into frictional contact, the rotation
of the countershaft and of the axle driven by it being thus reversed. In an
intermediate position of the countershaft bearings the axle is not driven. For the
purpose of varying the speed of the vehicle while that of the motor remains
unchanged, I provide a second set of the gear above described, connecting the
motor shaft to another of the running axles through drums or gear differently
proportioned.
When this arrangement is adopted, I interlock the levers or other mechanism
by which the bearings of the countershafts are moved, so that neither countershaft
can be put in position to be driven by the motor unless the other is in the
intermediate position in which it is not driven.
When a gas engine is employed as the motor, I prefer to regulate its speed by
an inertia governor, and to provide means of shifting the inertia weight so as to
vary the speed at which it governs.
Dated this 8th day of June 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Gear for Reversing and Speeding Tram Cars and
other Locomotives.
I, HENRY PERcy Holt, of No. 10 St. Bride Street, in the City of London,
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 :-
My invention relates to means of readily altering the direction and speed of a
tram car or other locomotive while the direction and speed of the motor remains
unchanged. For this purpose, as shewn diagrammatically by the accompanying
drawing, I fix on the shaft A driven by the motor which may be a gas or other
engine, or an electro motor, a drum B carrying a belt C which when tightened
drives a drum D on a counter-shaft E which counter-shaft by chain or belt or other
suitable connecting gear, drives the axle F of one of the running wheels G of the
vehicle.
The countershaft E is mounted in bearings which can be slid, or moved radially,
so as to slacken the belt C and to bring the two drums B and D into frictional

page_text: contact, the rotation of the countershaft E and of the axle F driven by it being
thus reversed. In an intermediate position of the bearings of E there is no
frictional contact of D and B and the belt C is loose, so that the countershaft E
and axle and wheel F and G are not driven. For the purpose of varying the
speed of the vehicle, while that of the motor remains unchanged, I provide a second
set of the gear above described connecting the motor shaft A to another F1 of the
running axles through drums or gear differently proportioned.
When this arrangement is adopted I may apply any known interlocking
apparatus to the levers or other mechanism by which the bearings of the counter-
shafts E and E are moved so that neither countershaft can be put in position to
be driven by the motor unless the other is in the intermediate position in which it
is not driven. When a gas engine is einployed as the motor, its speed being
regulated by an inertia governor, I may provide means of shifting the inertia
weight so as to vary the speed of the engine, and thus I may dispense with the
second set of gear, or, while that set is retained, I may run the car at intermediate
speeds as determined by the governor.
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. For reversing or stopping the motion of a tram car or other locomotive while
the motor shaft revolves always in one direction, the combination of a belt and
friction drum on the motor shaft and a belt and friction drum on a counter shaft
provided with sliding bearings and geared to a driving axle, substantially as herein
.described.
2. For varying the speed in either direction, the duplication, substantially as
described, of the combined parts referred to in the preceding claim.
Dated this 7th day of March 1894.
ABEL & IMRAY,
Agents for the Applicant.