Improvements in or connected with Gas and Oil Motors.
Year: 1899

page_text: Date of Application, 21st Oct., 1899
Complete Specification Left, 21st July, 1900-Accepted, 25th Aug., 1900
PROVISIONAL SPECIFICATION.
Improvements in or connected with Gas and Oil Motors.
I, ALFRED ROWE BELLAMY, of Fordsburg, Edgeley, Stockport, in the County
of Chester, Engineer, do hereby declare the nature of this invention to be as
follows:-
My said invention has reference more particularly to the starting of gas
and oil motors. In starting such engines it is a common practice to turn the
engine by hand until the crank is in the best position to receive the starting
impulse.
Gas or explosive mixture is admitted or forced into the cylinder and com-
bustion chamber behind the piston which explosive mixture when a certain
compression is reached, is fired and the engine thus started. It is found, how-
ever, and particularly with large engines, that the compressed charge behind
the piston has a tendency to start the engine before the explosion takes place
thus moving the crank from its position, and neutralizing the efficiency of
the initial explosion. To prevent this, brakes have been used which have
been taken off by hand just prior to the explosion.
The object of my invention is to provide means whereby such braking surface
shall be automatically removed upon the initial or starting explosion taking
place.
In carrying my invention into effect I provide a cylinder having a piston
valve sliding therein. This piston valve carries a piston or stem the end
of which protrudes out of the cylindrical casing. A suitable brake block is
mounted on a fulcrum in juxtaposition with the flywheel, a brake pulley or
other revolving part of the engine, and this brake is connected by means of
a link to a pivotted lever. When the brake block has been applied to the pulley
the connected link and pivotted lever are arranged so as to be extended in a
rigid straight line which resists any back pressure from the brake block and
thus maintains the block in frictional contact with the periphery of the flywheel
or brake pulley. The pivotted lever is arranged in contact with the protruding
end of the piston valve stem.
On the initial or starting explosion taking place the pressure of the gases is
The
conducted to the cylinder forcing the piston valve down upon its seat.
stem of the piston thus turus the pivotted lever upon its fulcrum raising
the attached link and thus removing the pivotted brake block from contact with
the brake pulley.
As the gist of my invention consists in removing the braking surface by
means of a sliding piston operated by the force of the initial or starting ex-
plosion the method described of effecting this may be varied to some extent
without departing from the spirit of my invention.

page_text: Improvements in or connected with Gas and Oil Motors.
I, ALFRED ROWE BELLAMY, of Fordsburg, Edgeley, Stockport, in the County
of Chester, 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 and accompanying drawings;
My said invention has reference more particularly to the starting of gas
and oil motors. In starting such engines it is a common practice to turn the
engine by hand until the crank is in the best position to receive the starting
impulse.
Gas or explosive mixture is admitted or forced into the cylinder and com-
bustion chamber behind the piston which explosive mixture when a certain
compression is reached, is fired and the engine thus started. It is found how-
ever, and particularly with large engines, that the compressed charge behind
the piston has a tendency to start the engine before the explosion takes place
thus moving the crank from its position, and neutralizing the efficiency of
the initial explosion. To prevent this, brakes have been used which have
been taken off by hand just prior to the explosion.
The object of my invention is to provide means whereby such braking surface
shall be automatically removed upon the initial or starting explosion taking
place.
The accompanying two sheets of drawings clearly illustrates my invention.
Fig. shows in side elevation, partly in section, my method for automatically
removing the braking surface on the starting of the engine.
Fig. 2 shows the brake block removed.
Fig. 3 shows a modification in detail.
Fig. 4 illustrates another modification of my invention.
Referring in the first place to Figs. 1 to 3 in carrying my invention into
effect I provide a cylinder a having a piston valve 6 sliding therein. This
piston valve carries a piston or stem c the end of which protrudes out of the
cylindrical casing. The cylinder a is in communication with the combustion
chamber of the engine by means of a port d. A suitable brake lever e having a
block e¹ is mounted on a fulcrum f in juxtaposition with the fly wheel g or it
might be a brake pulley or other revolving part of the engine, and this brake
lever is connected by means of a link to a pivotted lever i.
When the brake block e' has been applied to the fly wheel g the connected
link and pivotted lever i are arranged so as to be extended in a rigid straight
line.
The piston 6 is at the end of its stroke bearing against stops 61. The tendency
of the flywheel g being to turn in the direction of the arrow the brake lever e and
lever are affected as shown by the arrows but motion in this direction is
resisted by the stem of the piston valve which is arranged to be in contact
with the lever i. The brake block is thus maintained in frictional contact with
the flywheel g
On the initial or starting explosion taking place the pressure of the gases is
conducted to the cylinder a through the port d forcing the piston valve 6 down
upon its seat as shown in Fig. 2. The stem c of the piston b thus turns the
pivotted lever i upon its fulcrum raising the attached link h and thus removing
the pivotted brake block e¹ from contact with the flywheel g.
The link might be dispensed with and the pivotted lever i be connected
directly to the brake lever e as shown in the diagram Fig. 3.
As the gist of my invention consists in removing the braking surface by means

page_text: of a sliding piston operated by the force of the initial or starting explosion
the method described of effecting this may be varied to some extent without
departing from the spirit of my invention.
Another method of effecting the object is shown in Fig. 4. In this case
the brake lever e which is pivotted at el is held in position against the flywheel g
by means of a lever i pivotted at . The lever i bears against a stud e² on the
brake lever e, the spring j connected to the brake levere being extended.
On the initial explosion taking place the gases entering the port d in the
cylinder a force forward the piston b the rod c of which is connected to the
lever i.
The lever is thus turned on its fulcrum and is moved away from the stud e²
and the extended spring j removes the brake block e³ from contact with the
flywheel g.
On the engine being started the port d may be closed by means of a suitable
valve.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is-
1) On the starting of gas and similar motors automatically removing the
braking surface by the force of the initial or starting explosion substantially
as described and shown.
2) For the indicated purpose the cylinder a the piston valve 6 sliding therein
having a stem c, the pivotted lever i connected by means of a link hor
directly to the brake levere and arranged and acting in the manner and
substantially as described and illustrated in Figs. 1 to 3 of the drawings.
3) The modified method of automatically removing the braking surface on
the starting of gas and similar motors consisting of a cylinder a a piston b
sliding therein connected by means of a rod c to a pivotted lever i adapted to
maintain the braking surface in contact with the flywheel or other revolving
part of the motor against the action of a spring, the spring removing the braking
surface on the lever being turned on its pivot by the piston on the initial
explosion in the manner and substantially as described and illustrated in Fig. 4
of the drawings.