An Improvement in Lubricators for Cylinders of Gas Motor Engines.
Year: 1898

page_text: Date of Application, 5th Apr., 1898-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
An Improvement in Lubricators for Cylinders of Gas Motor Engines.
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 :-
In my Specification No. 10113 of 1894 I have described a lubricator for the
cylinder of a gas motor engine, having a valve for admitting lubricant into the
cylinder opened by a flexible diaphragm which is moved by the reduction of
pressure of the gas caused by the suction stroke of the piston. My present
invention relates to means of maintaining constant level of the lubricant over the
valve, thus ensuring more exactness in the supply of lubricant for which the
movement of the valve may be adjusted.
The accompanying drawing is a vertical section of a lubricator modified
according to my present invention.
On a base B having a boss b screwed into a sight feed communicating with the
cylinder is fixed a cylindrical glass G having bolted to the base B a cover made in
two parts C and C¹ between which is clamped a flexible diaphragm D. To this
diaphragm is attached the stem of the valve V which seats on a hole of the base B
and has a needle v grooved or flattened on its sides extending down into the sight
feed.
The space above the diaphragm D is connected by a pipe P to the gas supply
pipe preferably between the gas check or cock and the governor valve, and the
space within the vessel has an opening A to the outer air. O is a passage for
supplying oil covered by a cap o. When by the suction stroke of the piston, the
pressure in the gas supply pipe is less than that of the atmosphere, the diaphragm D
rises lifting the valve V and so allowing oil to descend by the sight feed into the:
cylinder. So far the lubricator is constructed and operates as described in my
former Specification No. 10113 of 1894 the stroke of the diaphragm being
determined by a setting screw c.
But I have found that as the level of the oil in the vessel varies the quantity of
lubricant supplied also varies, so that when the lubricator is full the cylinder
receives too much lubricant and when it is nearly empty the cylinder receives too
little. I have therefore, according to my present invention applied means of
maintaining the level of the oil over the valve constant. For this purpose by means
of a cylindrical partition H which may be of glass I form a a compartment for oil
above the valve, and to the lower cover C¹ I attach a pipe K which extends down
nearly to the bottom of the vessel; also I form a groove or a flattened part on the
valve stem when it passes through a boss L of the lower cover which projects down
to or a little below the level of the top of the partition H. When the diaphragm D
rises, a partial vacuum is created in the space under it and consequently oil ascends
the pipe K into this space and flows through the passage at L down into the
compartment within the partition H. Surplus oil thus delivered into the compartment
overflows into the outer space of the vessel.
Thus the oil over the valve V is maintained at a constant level.

page_text: 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 :-
In combination with a lubricator of the kind described in the Specification
No. 10113 of 1894, a partition forming an inner compartment and a suction pipe
extending down into the outer compartment, constructed and operating substantially
as described.