Year: 1894

page_text: Date of Application, 20th July, 1894
Complete Specification Left, 20th Apr., 1895-Accepted, 8th June, 1895
I, HENRY PERCY HOLT, of No. 22 Chancery Lane, in the County of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to an arrangement of engines and driving gear for. gas
motor cars, and to means of reversing the direction of rotation of the gas motor
shaft.
I mount the crank shaft in a vertical position about the middle of the car, having
on its lower end a horizontal fly wheel from which by bevil and suitable inter-
mediate gear actuated at one side of the car, I drive the wheels of the car.
To the crank on the vertical shaft I connect the pistons of two horizontal
cylinders one situated at the side of the car opposite to the gearing, and the other
situated towards one,end.
I provide the latter cylinder with means of cutting off the gas supply, and
allowing the piston to move idly, when the other cylinder is sufficient to give the
necessary power.
I can thus dispense with a second set of slow speed gear for starting and
ascending gradients. Besides the second cylinder mentioned as being situated
towards one end of the car, there may be a third cylinder situated towards the
other end, this cylinder also being provided with means of cutting off the gas
supply.
For the purpose of reversing, I in the first place arrange the ignition gear. so
that the cylinder charge is always ignited a little before the piston reaches the end
of its instroke, so that, when the engine is going slowly, the flywheel having little
momentum, the combustion of the charge propels the piston in the direction
opposite to that. in which it was proceeding towards the extreme of, its instroke.
I also arrange the cams which work the gas and air supply valves, the exhaust valve
and the ignition gear, not fixed in position on the valve shaft but driven by stops
fixed thereon, so that when the rotation of the shaft is reversed, they, take a position
relatively to the crank to suit the reversed motion.
"1
I also provide a centrifugal governor to control the gas supply, valve according to
the speed of the engine, and I provide a spring which can be made to bear against the
sliding sleeve of the governor, so as to aid the centrifugal force. I connect, to a
lever, on, which one end of this spring bears, a pair of slides faced with; leather,
wood or the like, one of which, slides, by means of a hand lever I can cause to
press, upon the engine shaft or the valve shaft, when, I desire to effect reversal.
When the slide is, so, pressed, it is caused by the friction on the revolving shaft
to travel in such a direction,as to compress the spring, which, aiding the centri-
fugal force, causes the governor to operate as if the speed of the engine
were excessive, cutting off the gas supply, until the speed is so far reduced that the
fly wheel has scarcely sufficient momentum to carry the crauk over its back centre;
a gas charge being then admitted to, the cylinder, is fired by the ignition, taking
place, just, before the back centre,is reached, and thus the engine is reversed, us
stated above.
The slide is now caused by its friction on the reversed shaft to travel backwards,

page_text: relieving the governor sleeve from the spring and so restoring the governor to its
normal condition.
Dated this 20th day of July 1894.
ABEL & IMRAY,
Agents for the Applicant.
↓
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I, HENRY PERCY HOLT, of No. 22, Chancery Lane, in the County 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 an arrangement of engines and driving gear for gas
motor cars, and to means of reversing the direction of rotation of the gas motor
shaft, as I shall describe referring to the accompanying drawings.
Fig. 1 is a longitudinal section and Fig. 2 is a plan of the under part of a gas
motor car shewing the arrangement of engines and driving gear according to
my invention, but for the sake of clearness omitting the framing and shaft bearings
which may be constructed and arranged in various ways, as may be readily
understood.
Fig. 3 is a plan, Fig. 4 is a front view partly in section and Fig. 5 a side view
partly in section shewing mechanism according to my invention for adjusting the
governor for reducing speed prior to reversing.
I mount the crank shaft A in a vertical position about the middle of the car,
having on its lower end a horizontal fly wheel B from which by bevil gear C and
suitable intermediate gear D actuated at one side of the car, I drive the wheels E
of the car.
To the crank on the vertical shaft I connect the pistons of two horizontal
cylinders one F situated at the side of the car opposite to the gearing, and the other G
situated towards one end.
"I provide either cylinder with means of cutting off the gas supply, and allowing
the piston to move idly, when the other cylinder is sufficient to give the neces-
sary power.
་
I can thus dispense with a second set of slow speed gear for starting and ascending
gradients. Besides the cylinder G there may be a third cylinder G¹ situated
towards the other end, this cylinder also being provided with means of cutting off
'the gas supply.
For the purpose of reversing, I in the first place arrange the ignition gear so
that the cylinder charge is always ignited a little before the piston reaches the end
of its compressing instroke, and consequently when the engine is made to go slowly,
the flywheel having little momentum, the combustion of the charge may propel the
piston in the direction opposite to that in which it was proceeding towards the
extreme of its' instroke. I also arrange the cams which work the gas and air
supply valves, the exhaust valve and the ignition gear, not fixed in position on the
valve shaft but driven by stops fixed thereon, so that, when the rotation of the
shaft is reversed, they take a position relatively to the crank to suit the reversed
motion.
.
I also as shewn in Fig. 3 provide a centrifugal governor H to control the gas
supply valve according to the speed of the engine, and I provide a spring I which,
bap be made to bear against the sliding sleeve or spindle S of the governor, so as to
aid the centrifugal force in swinging the governor balls outwards. One end of
this spring bears on one arm L of a lever to the other arm M of which I connect
by a link M, to a pair of slides N and N¹ faced with leather wood or the like, oue

page_text: of which slides by means of a lever O worked by a handle P and provided with a
roller QI can cause to press upon the engine shaft or the valve shaft R when I
desire to effect reversal. Assuming the shaft R to be revolving in the direction of
the arrow, when the upper slide N is so pressed by pushing the handle P it is
caused by the friction on the revolving shaft R to travel towards the left moving
the lever arms M. L in such a direction as to compress the spring I which, aiding
the centrifugal force, causes the governor to operate as if the speed of the engine
were excessive, cutting off the gas supply, until the speed is so far reduced that the
fly wheel has scarcely sufficient momentum to carry the crank over its back centre;
a gas charge being then admitted to the cylinder, is fired by the ignition taking
place, just before the back centre is reached, and thus the engine is reversed, as
stated above.
The slide N is now caused by its friction on the reversed shaft to travel backwards
relieving the governor from the pressure of the spring I and so restoring the
governor to its normal condition.
Should the shaft R be revolving in a direction opposite to that of the arrow,
when reversal of the engine is required, then the operator, instead of pushing the
handle P so as to press the slide N on the shaft, draws the handle P so as to press the
lower slide N¹ on the shaft, the effect being as before to compress the spring I and so
aid the centrifugal force of the governor. The rod of the handle P is provided
with springs T to bring the lever O always back to its middle position where it
causes neither of the slides N N¹ to press upon the shaft R.
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. Motor and driving gear for a gas motor car consisting of an engine or a pair
of engines situated towards the end or ends of the car and another engine situated
at the side acting on one crank of a vertical shaft carrying a horizontal flywheel,
driving through bevil and intermediate gear the wheels on one side of the car
substantially as described with reference to Figs. 1 and 2.
2. The herein described method of reversing the engine, by arranging ignition to
take place a little before the piston reaches the extreme of its compressing stroke,
supplying the cylinder with a combustible charge, and reducing the speed of the
engine until the momentum of the flywheel is scarcely sufficient to carry the crank
over its back dead centre, so that when ignition takes place the movement of the
piston is reversed.
3. The herein described method of reducing speed of the engine by pressing on
the revolving engine or valve shaft a slide which, being thus caused to travel with
the shaft compresses a spring which, acting on the sleeve or spindle of a centrifugal
governor causes it to operate as when the speed is excessive by reducing the gas
supply.
4. For operating as set forth in the preceding claims apparatus substantially as
described with reference to Figs. 3, 4 and 5.
Dand the oth
A
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