Improvements in Stopping and Restarting Tram Cars and other Vehicles.
Year: 1893

page_text: Date of Application, 9th Jan., 1893
Complete Specification Left. 8th Mar., 1893-Accepted, 29th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Stopping and Restarting Tram Cars and other
Vehicles.
I EDMUND CHADWICK of Number One Falcon Street Douglas Isle of Man
Retired Builder do hereby declare the nature of this invention to be as follows:→
I place on centre of each axle a small wheel suitably grooved round which I
place an endless linked chain which passes through the centre of a spiral spring of
suitable length and strength which is supported underneath and parralel with
the underside of vehicle in a tube or cage inside each end of which I place a round
disc having a hole in centre for chain and with a projecting arm on each side
I also place on disc a pall actuated by a spring which is kept out of gear when not
required, by the spiral pressing it against end of cage. To each of the projecting
arms I attach a chain which is connected at the other end on to a short shaft on
which is a toothed wheel geared into a similar wheel on axle I arrange that the
wheel on shaft can be moved in and out of gear by a chain or rod the arrange-
ment thus acting as a break by compressing spiral spring in stopping, and by
means of palls gripping chain, assisting to again restart car, on being released.
Dated this the Sixth day of January 1893.
EDMUND CHADWICK.
COMPLETE SPECIFICATION.
Improvements in Stopping and Restarting Tram Cars and other
Vehicles.
EDMUND CHADWICK 1, Falcon Street Douglas, Isle of Man Retired Builder
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:-
To render my invention perfectly clear I will proceed to describe the same in
detail by aid of the two sheets of drawings forming part of this Specification.
Before however, I proceed to describe my invention I wish it to be distinctly
understood that I do not confine myself to the exact details shewn.
Referring to the drawings, the view on Sheet 1 is a plan of the general
arrangement, and on Sheet 2 Fig. 1 shews a longitudinal section of the wheels and
axles of a tramcar or other vehicle, shewing my invention applied.
Fig. 2. is an end view of Fig. 1.
Fig. 3. is a view of disc shewing palls.
Fig. 4. is an enlarged detail of chain.
Fig. 5. is a back view of plate shewing guides for chain.
Fig
1 of Fig
6 is an enlarged detail of
Fig. 7. is an enlarged sectional view of one end of Fig. 1.
The apparatus consists of a spiral spring A loosely supported in a cage made up
of four rods B, B, B, B, which are connected to the two axles C and C on each of
hese axles I place a chain wheel D, D, with a smaller toothed wheel E attached
o it. Round the chain wheel and passing through the centre of the spiral spring
arrange an endless chain F. At each end of the spring and fitted to slide easily
on the cage I place a round plate or disc G with two projecting arms G¹, G¹ and
also two palls H. H which are pivoted on to the disc in such a manner, as to be
kept perpendicular by means of small springs as shewn on Fig. 7. I also
place at each end of the cage a plate I, with two projecting pieces I¹ I¹
Fig. 7. is an enlarged sectional view of one end of Fig. 1.
The apparatus consists of a spiral spring A loosely supported in a cage made up
of four rods B, B, B, B, which are connected to the two axles C and C on each of
hese axles I place a chain wheel D, D, with a smaller toothed wheel E attached
o it. Round the chain wheel and passing through the centre of the spiral spring
arrange an endless chain F. At each end of the spring and fitted to slide easily
n the cage I place a round plate or disc G with two projecting arms G', G¹ and
lso two palls H. H which are pivoted on to the disc in such a manner, as to be
kept perpendicular by means of small springs as shewn on Fig. 7. I also
lace at each end of the cage a plate I, with two projecting pieces I¹ I¹

page_text: arranged in such a manner that when the spiral spring is fully extended, the two
projecting arms I¹, I press against the palls H, H, when by counteracting the
effect of the small springs the palls will be thrown out of action. On the other
side of the plate I above and below the chain F. I place guides F', F¹ to keep the
chain in position.
Behind each axle and supported at a suitable height by means of a light frame X
running on the axle, C, I place a short shaft K. on which is keyed a toothed
wheel L, which can be thrown in and out of gear with the toothed wheel E, on
the axle C by means of cranks M and M' and connecting rods N and N shewn
on Sheet 1 of drawings. Each end of the small shaft 1 connect by means of
chains O, to the projecting arms G', G' on disc G.
The effect of the arrangement is as follows, supposing the car to be moving and
the toothed wheels thrown into gear the chains by being wound round the short
shaft will compress the spiral spring, thus acting as a brake in stopping the car,
on the toothed wheels being thrown out of action the palls H. H. actuated by the
small springs will grip the endless chain, the force of the spiral spring being
expended in starting the car I would also connect one of the chains at each end of
car, (which compresses spiral spring,) with the ordinary brake chain or rod in
such a way that when the spring is compressed to a proper distance, it would then
pull the brake hard on.
In connection with the chain wheels, as there might be cases where it was not
advisable to have the chain wheels fast on both axles (such as where there was a
difference in the diameter of wheels thus causing a difference in the speed of the
two axles or for other reasons) in such cases I propose to allow the wheels on one
end to run loose on axle, or if necessary on an additional shaft to be supported
from underside of car as shewn at Y in Fig. 1. I propose to use but one handle
which would require to be movable, to actuate this apparatus so as to leave the
entire control of it to one person.
Having now particularly described and ascertained the nature of my invention
and in what manner it is to be performed I declare that what I claim is
1st. The general arrangements construction and combination of parts comprising
the improved apparatus for stopping and starting tram cars and other vehicles
substantially as herein before described and shown.
2nd. An apparatus for improving the stopping and starting tram cars and other
vehicles by placing a spiral spring in a suitable position for the endless chain which
passes round the chain wheels on axle's to pass through.
3rd. For the arrangement of the disc's, palls, and plate's with projecting arms in
such a way that while the said palls will grip the endless chain when required, they
are kept out of gear and clear of the chain when not required.
4th. The arrangement of the short shaft and the means by which the spring
being compressed in stopping has its full force directed to again assist in starting
car on being released and also that the spring being compressed beyond proper
distance applies ordinary brake.
5th. The arrangement of a fast chain wheel on one axle and a loose one on the
other or on the additional shaft in cases where it was not practicable to have both
chain wheels fast to the axle's.
Dated this the Sixth day of March One thousand eight hundred and ninety-
EDMUND CHADWICK.