Improvements in and Applicable to Gas and Oil Engines.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in and Applicable to Gas and Oil Engines.
ALFRED EDWARD ALBERT BROWN, of 306, Lenton Boulevard, Nottingham,
Engineer, do hereby declare the nature of this invention to be as follows:
This invention has reference to improvements in and applicable to gas and oil
engines, and relates more particularly to improved valve actuating mechanism,
and speed governing mechanism, the object of the invention being the provision
of simple and effective means whereby the gas and air inlet valves may be
simultaneously operated by the same or independent actuating mechanism; means
whereby the said valve actuating mechanism will open the air valve only when the
normal speed of the engine is exceeded; means whereby the said air valve, when
open alone, is held open until the speed of the engine falls to normal; and means
whereby the air valve holding mechanism is prevented from coming into action
or the air valve is released from such holding mechanism whenever the gas valve
is opened.
According to this invention the gas and air valves are actuated by the end of a
lever fulcrumed on a movable fulcrum which receives its motion from the crank
shaft, the said valve operating lever being normally held in a definite position
by a spring. As the valve operating lever moves toward the valve spindles it
strikes upon a fixed stop which moves it under normal conditions into a position
to actuate either or both valve according to the arrangement and speed of the
engine. The gas valve spindle is provided with a projection which may be used
for operating the air valve and for acting on the air valve holding mechanism,
or the said projection may be used for the latter purpose only. When the air
valve is opened alone it is held in that position by a catch or its equivalent from
which it is released by the gas valve spindle at the next movement of the latter.
The parts are so arranged that the valve holding mechanism is prevented from
operating when both valves are opened together.
A
1
Y
1000
Improvements in and Applicable to Cas and Oil Engines.
ALFRED EDWARD ALBERT BROWN, of 306, Lenton Boulevard, Nottingham,
ngineer, do hereby declare the nature of this invention, and in what manner
[Price 8d.]

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
-
This invention has reference to improvements in and applicable to gas and oil
engines, and relates more particularly to improved valve actuating mechanism;
the object of the invention being the provision of simple and effective means
whereby the gas and air inlet valves may be simultaneously operated by the same
actuating mechanism; means whereby the said valve actuating mechanism will
open the air valve only when the normal speed of the engine is exceeded; means
whereby the said air valve when opened alone is held open until the speed of the
engine falls to normal; and means whereby the air valve holding mechanism is
prevented from coming into action, or the air valve is released from such holding
mechanism whenever the gas valve is opened.
According to this invention the air valve spindle is fitted with a block which
works within a slot formed in a piece attached to the gas valve spindle and so
arranged that the air valve may be opened independently of the gas valve and so
that when the gas valve is opened the air valve is opened also. There is also
a catch. arrangement working in conjunction with the air valve spindle, so
arranged that whenever the air valve is opened without the gas valve the catch
come into operation and holds the air valve opened until the gas valve is next
opened, at which time the catch is released and the valves close simultaneously
but when both valves are opened together the catch is prevented from coming
into action. For operating the valve spindles there is a lever which is oscillated
from the crank shaft, and to this lever there is pivotted a second lever so weighted
and arranged in conjunction with a fixed stop that when it is moved towards the
valve spindles in comes into contact with the fixed stop and is turned on its
fulcrum through an angle which varies approximately with the speed of the
engine.
In the drawings which accompany this specification and are referred to in the
following detailed description
Fig. 1 is an elevation of the improved mechanism showing the position occupied
by the same when the engine is running at its normal speed.
Fig. 2 is an elevation of the improved mechanism showing the position occupied
when the engine is running at a speed higher than its normal speed.
Fig. 3 is an end elevation of the air valve spindle and
Fig. 4 is an end elevation of the gas valve spindle.
The improved valve actuating mechanism herein described may be applied to
gas and oil engines of any of the usual types. In the arrangement shown the
air valve is connected to the spindle 1, and the gas valve connected to the
spindle 2 and both valves are held closed with their spindles in the position
shown in Fig. 1 by suitably disposed springs. On the end of the spindle 2, and
fixed thereto, is a slotted piece piece 3, and on the end of the spindle 1 there is a
block which is fitted to work within the slotted piece 3. This spindle is also
provided with a collar 5, which normally abuts against the slotted piece 3, and
also with a recess 6. The air and gas valves are contained in the chamber 7
from which there projects an arm 8 and to the outer end of this arm there is
pivotted a catch 9 which is held upon the spindle 1 by a spring 10.
•
Pivotted at any convenient part of the engine frame there is a lover 11 which
is oscillated through a link 12 by a crank or eccentric suitably driven from the
crank shaft. Pivotted at the top of the lever 11 there is a weighted lever 13, one
end of which is curved as shown at 14 while the other is fitted with a thin steel
plate 15. There is also a piece 16 fixed to the engine framing and so placed that
it is struck by the end 14. of the lever 13. when the latter is moving towards the
valve spindles.
When an engine fitted with the improvements herein described is working
under normal conditions the lever 13 is filted when the end 14 strikes the stop 16
but the weight of lever 13 is so regulated that the end 15 falls low enough to
strike below the slot in the piece 3 before such piece is reached. The niece 3 in

page_text: then pushed in to open the gas valve and this movement through the collar 5
also opens the air valve, so that both valves are operated simultaneously. At the
same time the upper end of the piece 3 acts upon the catch 9 which is held up and
prevented from engaging with the recess 6. When however the speed of the
engine exceeds the normal, the plate 15 through the end 14 and block 16 is raised
to a higher position and has not time to fall below the bottom of the slot in the
piece 3 before the end of the plate 15 is in contact with the end of the spindles.
The plate 15 then strikes upon the block 4 and the air valve spindle 1 is pushed
in and the air valve opened independently of the gas valve. When this takes
place the catch 9 comes into operation and by falling into the recess 6 holds the
air valve open until the speed of the engine falls to normal and the gas valve is
opened, the movement of the latter, by the piece 3, raising the catch 9 and by
releasing the spindle 1 allows the air valve to be closed by its spring.
Instead of the lever 11 and its attached parts any other equivalent arrangement
may be used in which the position of a striking piece is varied according to the
speed of the engine.
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. The combination and arrangement of a gas valve spindle by or through which
the gas and air valves may be opened simultaneously, and an air valve spindle by
which the air valve may be opened independently of the gas valve and a catch
arrangement constructed arranged and operating substantially as herein described
and for the purpose herein set forth.
2. The general arrangement and construction of the valve operating mechanism
as herein described with reference to the accompanying drawings.
Dated this oth
W. H. POTTER,
Patent Agent, Brougham Chambers, Nottingham.