Improvements in or relating to the Valve Gear of Gas, Petroleum, and other similar Engines.
Year: 1891

page_text: Date of Application, 8th Jan., 1891
Complete Specification Left, 8th Oct., 1891-Accepted, 8th Jan.. 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Valve Gear of Gas, Petroleum,
and other similar Engines.
A communication from BERLINER MASCHINENBAU-AKTIEN-GESELLSCHAFT,
late L. Schwartzkopff, of Berlin, in the Empire of Germany.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
This invention relates to an arrangement enabling by means of one individual
part of the reversing gear, two adjacent closing devices, such as distributing or slide
valves to be alternately operated in such a manner that while one of the valves is
opened the other is closed and vice versa.
This arrangement is specially adapted for use in connection with gas or petroleum
motor engines.
In the accompanying drawings which illustrate this invention,
A is the main driving shaft which by suitable gearing bearing a relation of 1
to 2 conveys motion to the reversing shaft B. The reversing shaft is provided
with a crank or eccentric which through the medium of link C imparts reciprocating
motion to the slide or block D, which is provided with a pin E upon which is
pivotted a bell-crank lever F F. With the sliding block D is connected slide G
by which the extent of motion of the bell crank lever in either direction is limited.
In a line with the arm F of the bell-crank lever F F¹ is arranged a valve H which
when open admits gas or petroleum and when closed cuts off the supply of such
combustible.
Above this valve a cut-off slide or valve is
mixture is ignited no air may be drawn in.
machine mounted on a pivot a small catch or
to be stated.
arranged so that when the explosive
There is further on the frame of the
pawl K fulfilling a purpose presently
Fig. 2 shows the mechanism at the moment when the sliding block D is in its end
position on the right. This being so if the slide D and the bell-crank lever be
moved to the left by means of the reversing crank the arm F of the said bell-
crank lever will come into contact with the pawl K and thereby the bell-crank
lever will be caused to turn on its pivot for a given distance limited by the slide G.
Should the slide D move still further to the left it will thereby release the arm F' of
the bell crank lever when the latter will take up the position shown in Fig. 3.
Being fitted with a weight L the lever arm F will however manifest a tendency to
descend and in the lowest point it then can reach it will open the supply valve H
and admit the required amount of gas petroleum or the like.
Such is the operation of a motor-engine fitted with these improvements under
normal circumstances. But should it so happen that from any cause the proper
number of revolutions is exceeded the lever-arm F would have no time to move past
the head O of the slide J (Fig. 3) but would with its edge P catch in a notch
provided for the purpose in the head O thereby closing the valve J and rendering
it impossible for the machine to draw in a combustible charge thus precluding
explosion.
By suitably displacing the weight L or the catch or pawl K the precise
moment of the engagement of the knife-edge P with the notch in head O may be
adjusted and thus the number of revolutions determined.
It should be borne in mind that the angle of displacement of the bell-crank
lever F F is permanently limited by the slide G quite independently of the speed
of the motor while the time in which the said lever can resume its normal position

page_text: solely depends on the position of the weight L or the pawl K. Instead of a weight
a suitable spring may be used if preferred.
As the slide D returns the arm F¹ of the bell-crank lever raises the pawl K and
this is subsequently pressed down again by a spring so that the whole mechanism
resumes the position shown in Fig. 2 and the same operation may be repeated.
Dated this 8th day of January 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to the Valve Gear of Gas, Petroleum,
and other similar Engines.
A communication from BERLINER MASCHINENBAU-AKTIEN-GESELLSCHAFT,
late L. Schwartzkopff, of Berlin, in the Empire of Germany.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., 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 :-
This invention relates to an arrangement enabling by means of one individual
part of the valve gear two adjacent closing devices such as distributing or slide
valves to be alternately operated in such a manner that while one of the valves is
opened the other is closed and vice versa.
This arrangement is specially adapted for use in connection with gas or petroleum
motor engines.
In the drawings filed with the Provisional Specification which illustrate this
invention
A is the main driving shaft which by suitable gearing bearing a relation of 1
to 2 conveys motion to the shaft B. This valve operating shaft B is provided with
a crank or eccentric which through the medium of link C imparts reciprocating
motion to the slide or block D which is provided with a pin E upon which is
pivotted a bell-crank lever F F. The slide D carries a stop G by which the
extent of motion of the bell-crank lever in either direction is limited. In a line
with the arm F of the bell-crank lever F F is arranged a valve H which when
open admits gas or petroleum and when closed cuts off the supply of such
combustible.
Above the valve H is arranged a cut-off or slide valve J for controlling the
supply of air, the operating rod of which valve is provided with a head O against
which the arm F strikes and thereby effects the closing of the valve J. This only
happens when, by reason of the speed of the engine being too great, the arm F is
not allowed sufficient time to get past the head () and reach the valve H the result
of this being that both the valves I and J are closed and no explosion takes
place.
There is further on the frame of the machine mounted on a pivot a small catch
or pawl K fulfilling a purpose presently to be stated.
Fig. 2 shows the mechanism at the moment when the sliding block D has reached
the end of its outward stroke. This being so when the slide D and the bell-crank
lever move to the left the arm F of the said bell-crank lever will come into contact
with the pawl K and thereby the bell-crank lever will be caused to turn on its
pivot for a given distance limited by the stop G. Should the slide D move still
further to the left it will thereby release the arm F' of the bell-crank lever, when
the latter will be in the position shown in Fig. 3. Being fitted with a weight L
the lever arm F will however manifest a tendency to descend and in the lowest
point it then can reach it will open the supply valve H and admit the required
amount of gas, petroleum or the like.

page_text: Such is the operation of a motor-engine fitted with these improvements under
normal circumstances. But should it so happen that from any cause the proper
number of revolutions is exceeded the lever arm F would have no time to move
past the head O of the slide J (Fig. 3) but would with its upper edge P catch in a
notch provided for the purpose in the head O thereby closing the valve J controlling
the supply of air and rendering it impossible for the machine to draw in a com-
bustible charge thus precluding explosion.
By suitably displacing the weight L or the catch or pawl K the precise moment
of the engagement of the knife-edge P with the notch in head O may be adjusted
and thus the number of revolutions determined.
It should be borne in mind that the angle of displacement of the bell-crank
lever F F is permanently limited by the stop G quite independently of the speed
of the motor while the time in which the said lever can resume its normal position
solely depends on the position of the weight L or the pawl K. Instead of a weight
a suitable spring may be used if preferred.
As the slide D returns the arm F' of the bell-crank lever raises the pawl K and
this is subsequently pressed down again by a spring so that the whole mechanism
resumes the position shown in Figure 2 and the same operation may be repeated.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner the
same is to be performed, I declare that what I claim is:
1. In a valve gear for gas petroleum and other engines the employment of a
reciprocating bell-crank lever such as F F adapted to be turned upon its pivot by
means of a pawl or tappet such as K at each stroke of the said slide its angle of
oscillation being limited by a stop G so that when the arm F is allowed freely to
descend it thereby opens the gas or other combustible supply substantially as
described and illustrated in the accompanying drawings.
2. In a valve gear for gas petroleum and other engines the combination with the
bell-crank lever and tappet K of an adjustable balance weight or spring whereby
the movement of the arm F may be properly timed so as to control the speed of the
engine substantially as described and illustrated in the accompanying drawings.
Dated this 7th day of October 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.