Year: 1888

page_text: 1, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery Lane in
the County of Middlesex, Consulting Engineer and Patent Agent do hereby declare
the nature of this invention to be as follows:-
In the Specifications to my application for Patents No. 11444 of 1887 and No: 688
of 1888 were described apparatus for igniting the charges of gas motor engines by
means of an externally heated tube, in which the passage leading back from the
igniting port of the engine cylinder to the said igniting tube had an extension
beyond the latter, forming a chamber for the reception of a portion of the combustible
charge which entered the said passage and heated igniting tube on opening the slide
or valve establishing the communication between these parts and the cylinder port.
The present invention relates to an improved arrangement of the said passage, igniting
tube, chamber, and slide or valve so as to insure firstly, that the combustion gases that
remain in these parts shall be effectually cleared out of the passage before the entrance
of the next charge of combustible gas, and secondly that the gases remaining in the
said parts shall be reduced to atmospheric pressure before the entrance of the next
combustible charge so as to enable the latter to effectually penetrate into the same
and to effect its certain and rapid ignition.
For this purpose the several parts are arranged as follows:-
The valve or slide which opens and closes the communication between the firing
port of the cylinder and the said parts, instead of being situated immediately against
the firing port, between this and the passage leading to the heated firing tube, is
situated between the said passage and the firing tube, and the before mentioned
chamber is made to communicate with the passage at a point between the valve or
slide and the firing port, so that the chamber and passage are always in communication
with the firing port. Furthermore, the valve or slide is so actuated by a cam or
I DOSI

page_text: excentric that the communication between the cylinder and the passage, the chamber,
and the heated igniting tube is kept open during the working stroke, the expelling
stroke and, in some cases also, during the suction stroke of the engine, while during
the compression stroke the communication with the igniting tube is closed, the passage
and chamber still remaining open to the cylinder. The result of this arrangement is,
that during the expelling and suction strokes, the several parts being open to the
atmosphere, the residual combustion gases from the last ignition will be free to escape
until they are at atmospheric pressure, and that on the following compression stroke,
the small volume of combustion gases remaining in the passage will be readily forced
into the chamber by the compressed combustible charge entering from the cylinder,
the passage becoming thus entirely filled and the chamber partially so by such charge,
so that on the valve or slide being now opened, only combustible gas will enter the
igniting tube, thus insuring a certain and rapid ignition of the charge.
The arrangement of the igniting apparatus for carrying out the above described
mode of action can be variously modified. Thus according to one arrangement, the
passage from the cylinder port extends vertically upwards to the heated igniting tube,
immediately below which is arranged a sliding plug-valve at right angles to the
passage for closing the communication, the stem of which valve is acted upon by a
helical spring tending to keep the valve open, this being closed at the desired moment
by a lover acted upon by a cam on a countershaft of the engine. The chamber is in
the form of a tube projecting horizontally from the passago at a point below the
valve.
.
It is found advantageous to effect the ignition of the charge somewhat sooner when
the engine is running fast than when running slow, and in order to enable this to be
done, the cam acting on the valve is arranged so that it can be shifted on the shaft in
order to bring a part thereof which is more in advance to act upon the valve stem
when the engine is to run at a quick speed.
The igniting tube is surrounded by the annular flame of a Bunsens burner, enclosed
in a cylindrical casing.
"
• According to another modification, the passage projects horizontally from the
side or end of the cylinder and the igniting tube projects vertically upwards from
the end thereof, the valve being situated vertically below the igniting tube, and
the tubular chamber extends vertically downwards from an intermediate point of the
passage.
ليوم
,
200

page_text: COMPLETE SPECIFICATION.
Improvements in Igniting Apparatus for Gas or Oil Motor Engines.
I, CHARLES DENTON ABEL of No. 28 Southampton Buildings Chancery Lane in the
County of Middlesex Consulting Engineer and Patent Agent 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 :-
-
In the Specifications of my applications for Patents No. 11444 of 1887 and 688
of 1888 were described apparatus for igniting the charges of gas motor engines by
means of an externally heated tube in which the passage leading back from the
igniting port of the engine cylinder to the said igniting tube had an extension beyond
the latter, forming a chamber for the reception of a portion of the combustible charge
which entered the said passage and heated igniting tube on opening the slide or valve
establishing the communication between these parts and the cylinder port. The present
invention relates to an improved arrangement of the said passage, igniting tube,
chamber, and slide, or valve, so as to insure firstly that the combustion gases that
remain in these parts shall be effectually cleared out of the passage before the entrance
of the next charge of combustible gas, and secondly that the gases remaining in the
said parts shall be reduced to atmospheric pressure before the entrance of the next
combustible charge so as to enable the latter to effectually penetrate into the same and
to effect its certain and rapid ignition.
For this purpose the several parts are arranged as follows:-
The valve or slide which opens and closes the communication between the cylinder
and the said parts, instead of being situated immediately against the cylinder, between
this and the passage leading to the heated firing tube, is situated between the said
passage and the firing tube, and the before mentioned chamber is made to communicate
with the passage at a point between the valve or slide and the cylinder; so that the
chamber and passage are always in communication with the cylinder. Furthermore,
the valve or slide is so actuated by a cam or eccentric that the communication between
the cylinder and the passage, the chamber and the heated igniting tube is kept open
during the working stroke, the expelling stroke and in some cases also, during the
suction stroke of the engine, while during the compression stroke the communication
with the igniting tube is closed, the passage and chamber still remaining open to the
cylinder. The result of this arrangement is, that during the expelling and suction
strokes, the several parts being open to the atmosphere, the residual combustion gases
from the last ignition will be free to escape until they are at atmospheric pressure, and
that on the following compression stroke, the small volume of combustion gases
remaining in the passage will be readily forced into the chamber by the compressed
combustible charge entering from the cylinder, the passage becoming thus entirely
filled and the chamber partially so by such charge, so that on the valve or slide being
now opened only combustible gas will enter the igniting tube, thus insuring a certain
and rapid ignition of the charge.

page_text: The arrangement of the igniting apparatus for carrying out the above described
mode of action can be variously modified. Thus according to one arrangement the
passage from the cylinders extends vertically upwards to the heated igniting tube,
immediately below which is arranged a sliding plug valve at right angles to the
passage for closing the communication, the stem of which valve is acted upon by a
helical spring tending to keep the valve open, this being closed at the desired
moment by a lever acted upon by a cam on a countershaft of the engine. The
chamber is in the form of a tube projecting horizontally from the passage at a point
below the valve.
It is found advantageous to effect the ignition of the charge somewhat sooner when
the engine is running fast than when running slow, and in order to enable this to be
done, the cam acting on the valve is arranged so that it can be shifted on the
shaft in order to bring a part thereof which is more in advance to act upon the
valve stem when the engine is to run at a quick speed.
The igniting tube is surrounded by the annular flame of a Bunsen's burner,
enclosed in a cylindrical casing.
According to another modification, the passage projects horizontally from the side
or end of the cylinder, and the igniting tube projects vertically upwards from the
end thereof, the valve being situated vertically below the igniting tube, and the
tubular chamber extends vertically downwards from an intermediate point of
the passage.
The above described arrangement may be carried out in various ways, thus,
Figs. 1 and 2 of the accompanying drawing shews an arrangement in which the
passage h, extending vertically up from the engine cylinder, has the externally heated
igniting tube fixed to its upper end, the tuber being heated by the surrounding
flame of a Bunson's burner u supplied with gas through a pipe a. At an intermediate
point of the passage is the tubular chamber extending at right, angles therefrom
and at a point between the chamber and the igniting tube, is the sliding piston
valve v, the stem of which is acted upon by a helical spring which tends to keep the
valve open as shewn.
A lever b c bears with its one arm upon the end of the valve stem and with its
other end upon a cam n on the countershaft e driven at half the speed of the engine
shaft. This cam is so formed that during that part of the revolution of e which corre-
sponds to the working, expelling, and suction strokes of the engine, it does not act
upon the valve, so that during this time the passage chamber and igniting tube
being in communication with the cylinder, will only contain gases at atmospheric
pressure but as the piston is about to commence its compressing stroke the cam n is
made to close the valve v and to keep this closed until the end of such stroke.
During this time a portion of the compressed combustible charge enters the passage
from the cylinder, thereby forcing the small quantity of combustion gases remaining
in it from the last ignition into the tube which also becomes partly filled with the
combustible charge, so that on the valve being now opened again by the spring, only
combustible gas
will pass into the igniting tube and consequently the certain and rapid
ignition of the cylinder charge will be insured.
h
When the valve v is open it is pressed by the spring with its coned face upon a
coned seating in the casing, thus preventing any escape of gas through the hole for
the valve stem. The cam n nay either be fixed on the countershafte so as always to effect
the closing of the valve at a determined moment, or it may be on a sleeve in capable
of being slid on the shaft e, and be made some width, with one side sloping as shewn
at Fig. 2a, so that by varying the position of the cam relatively to the lever e the
moment at which the valve is made to open so as to effect the ignition may be varied.
It is found that when a gas-motor engine is running at a quick speed, it is advan-
tageous to effect the ignition of the charge somewhat sooner than when it is running
at a slower speed, and this may be effected by the above described arrangement
by shifting the cam so that the part with shorter dwell acts upon the lever c. Figs. 3
and 4 shew another arrangement of the several parts.

page_text: The passage here extends horizontally from the side of the cylinder, with the
igniting tuber projecting vertically upward from its end, and the tubular chamber r
projecting vertically downwards, the valve v being also moved vertically from
below; the several parts are otherwise of the same construction and action as
described.
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. In apparatus for igniting the charges of gas-motor engines by means of an
externally heated tube, the combination of a passage leading from the cylinder to
the firing tube, a valve or slide arranged to close the communication between the
tube and passage, and a chamber communicating with the passage so that the passage
and chamber are always in communication with the engine cylinder, but the com-
munication with the igniting tube is closed by the valve during the compression stroke
of the engine substantially as and for the purposes herein described.
2. In igniting apparatus of gas-motor engines, the combination of a passage h
leading to the cylinder, externally heated igniting tube r, tubular chamber com-
municating with passage and valve v for closing the communication between the
igniting tube and passage h during the compression stroke of the engine substantially
as herein described.
3. In igniting apparatus such as is referred to in the preceding claim, effecting the
opening of the valve v earlier for a quick speed of the engine than for a slow speed by
means of an adjustable cam n so formed that in one position it acts on the valve lever
earlier than in another position, substantially as herein described.
Dath: 00th 2. of Navambar 18ee
ABEL & IMRAY,
Agents for the Applicant.