Year: 1887

page_text: Date of Application, 20th Sept., 1887
Complete Specification Left, 20th June, 1888
Complete Specification Accepted, 24th Aug., 1888
I, ROBERT MCDOWELL of 68 Roden Terrace, Limestone Road, Belfast, Marine
Engineer, do hereby declare the nature of this invention to be as follows:-
My present Invention has for its object, the providing of a simple and effective
means of lubricating the cylinders, pistons, valves, and other parts of steam, and other
engines which are operated by high pressure gases or other fluids.
In engines such as above referred to, it is commonly found that the internal
pressure, prevents the admission from the ordinary lubricators, of the oil or other
lubricant which they should supply, and it is therefore necessary to provide means
for injecting the lubricant into the cylinder or other parts of the engines, against the
pressure of the operating fluid.
For the purpose above referred to, I employ an improved lubricator or lubricating
apparatus, consisting of two or more pumps of a very small size, the discharge
orifices of which, communicate by a common outlet with the parts to be lubricated.
The pumps are, by preference single acting, and are fitted with plungers, actuated by
cranks or eccentrics, so arranged, that a constant discharge from the pumps may be
maintained; separate suction pipes being provided and connected to an oil box or
tank. The crank or eccentric shaft may be operated by any suitable mechanical
device from the engine, the parts of which are to be lubricated; a convenient
arrangement being toothed gearing, a toothed belt or the like.
To allow of the lubricant being seen, it is made to travel through a glass sight tube
attached to a metal frame, which latter is fitted to the top of a screw down valve, to
be hereinafter described. In the event of the glass tube above mentioned being
broken or damaged, a check or non-return valve is provided at the top of the sight
tube, by means of which, pressure from the cylinder or other part is prevented.
On the discharge orifice is placed an air vessel of ordinary design, provided with
a conical screw down valve at top end, and a conical escape valve at bottom end, and
also a pipe to connect the escape valve with the source of supply. The escape valve
above referred to, is loaded with a spiral spring, possessing a load by compression on
Pin S/1

page_text: spiral, equal to 50 lbs. per square inch above the operating pressure. For instance,
if this latter be 100 lbs. per square inch the valve will not permit of the lubricant
escaping, until the pressure has been increased to 150 lbs. per square inch by the
action of the small pumps above mentioned, consequently the air in the air vessel is
compressed to 150 lbs. per square inch to maintain a steady, regular, and uniform
flow of lubricant, the quantity being regulated by the screw down valve. The spiral
loaded escape valve may be adjusted at will, to open at any pressure, and so permit
of the superfluous lubricant finding its way back to the source of supply.
By the arrangement above described, which is specially applicable to non con-
densing engines, and engines in which no vacuum is created, a constant supply of
lubricant may be discharged at the required pressure on the parts to be lubricated.
Dated this 20th day of September 1887.
JAMES STEVENSON,
Grays Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant.

page_text: Improved Automatic Sight Feed Lubricator.
I, ROBERT MCDOWELL, of 68 Roden Terrace, Limestone Road, Belfast, Marine
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, reference being also had to the accompanying two sheets of
drawings, in which, Figure 1 represents a front elevational view and Figure 2 an end
clevational view of the device according to my Invention :-
My Invention has for its object the providing of a simple and efficient means of
lubricating the cylinders, pistons, valves and other parts of steam and other engines
which are operated by high pressure gases or other fluids. It is found in practice
that in order to effect the injecting of the lubricant into the cylinder or other parts of
such engines against the pressure of the operating gas or fluid, special means have to
be employed as distinguished from lubricators to be used under other conditions.
Various appliances have already been devised to this end but hitherto with indifferent
success. The object therefore of my Invention is to produce an automatic sight feed
lubricator especially adapted to meet the requirements which occur in the cases of
high pressure steam and other engines.
Referring to the accompanying drawings, the device or appliance according to my
Invention consists of two or more pumps A of a very small size, the discharge orifices
of which communicate by a common outlet with the parts to be lubricated. The
pumps are, by preference single acting, and are fitted with plungers B actuated by
cranks or eccentrics C, so arranged that a constant discharge from the pumps may be
maintained, the lubricant passing to the engine from the Tubricator by means of the
discharge pipe & Figure 2; separate suction pipes a being provided and connected to
a tank or reservoir for the lubricant, said tank or reservoir is of any convenient size
and material, and is provided preferably with cocks or valves to shut off the supply
of lubricant when necessary. The crank or eccentric shaft D of the cranks or
eccentrics (as the case may be) C, may be operated from the engine by any suitable
mechanical device such for instance as toothed gearing, belting or the like.
To allow of the lubricant being seen, it is caused to travel through a glass sight
tube E attached to a metal frame F, which latter is fitted to the top of a conical screw
down or stop valve G to be hereinafter described. In the event of the glass sight
tube before mentioned being broken, or requiring to be cleaned, an intermediate
non-return valve c is provided at the top of the sight tube E aforesaid, by means of
which the escape of steam and lubricant from the cylinder is prevented.
On the discharge orifice from the pumps, is placed an air vessel H of suitable size
and construction. The top of said air vessel is provided with a conical screw down
or stop valve G to regulate the supply of lubricant; the bottom end thereof being
fitted with a escape valve I and a pipe d to connect the escape valve with the source
of supply.

page_text: The escape valve I above referred to is loaded with a spiral spring possessing a
load by compression on spiral equal to 50 lbs. per square inch above the operating
pressure. For instance, if this latter be 100 lbs. per square inch, the spring loaded
escape valve I will not permit of the lubricant escaping until the pressure has been
increased to 150 lbs. per square inch by the pumps before mentioned, consequently
the air in said air vessel is compressed to 150 lbs. per square inch to maintain a steady,
regular, and uniform flow of lubricant, the quantity being regulated by the conical
screw down or stop valve G aforesaid. The spring loaded eseape valve I may be
adjusted at will to open at the desired pressure, and so permit of the superfluous
lubricant finding its way back to the source of supply by means of the pipe d before
mentioned.
By the arrangement last above described, it will be seen that in the event of the
pumps being geared to the engine, and the conical screw down valve G closed when
starting, the lubricant is drawn through the supply or suction pipes a and forced
through the escape valve I back to the source of supply by means of the pipe d.
As a means for throwing the pumps in and out of gear when the engine is running,
I provide a clutch and clutch lever or equivalent, fitted to the crank or eccentric
shaft, thereby allowing the valves or other parts to be examined without necessitating
the stoppage of the engines.
Thus, it will be seen that by the arrangement above described,-which is specially
applicable to non-condensing engines and engines in which no vacuum is created-a
constant supply of lubricant may be discharged at the required pressure to the parts
of the engine to be lubricated.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
The improved automatic sight feed lubricator herein described, by means of which
a constant supply of lubricating material is injected or discharged at the required
pressure into the cylinders or other parts of high pressure steam or other engines
against the operating gas or other fluid substantially as herein set forth and shewn in
the accompanying drawings.