Improvements in Lubricators for Solid or Semi-solid but Plastic Lubricants.
Year: 1889

page_text: Date of Application, 18th Sept., 1889
Complete Specification Left, 18th June, 1890-Accepted, 16th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in Lubricators for Solid or Semi-solid but Plastic
Lubricants.
1, GEORGE HEY STUART of 17, City Walls, Chester in the County of Chester,
Merchant, do hereby ileclare the nature of this invention to be as follows
This invention has for its object a lubricator for solid or semi-solid lubricants,
having a device adapted for forcing out, by pressure, the lubricant continuously
from the cup on to the bearing, and means for controlling the pressure and the
amount of lubricant delivered.
The lubricator comprises a cup adapted to contain fat or other lubricant, and is
provided with a central spindle on which slides a piston having preferably suitable
packing on its periphery. The bottom of the cup cominunicates with the tubular
shank which conveys the lubricant to the bearing.
The aforesaid central spindle has at its upper part a screw thread, and carries a
milled nut, between which and the piston is a spring, whose pressure on the piston
can be regulated by the said nut.
The mode of action is as follows:-
The cup being filled with lubricant, the piston is placed in the cup and pressed
down onto the grease by the spring and regulating screw, in such a manner that the
lubricant is forced down the stein, to the part to be lubricated, the spring gradually
expanding until its elasticity is expended, when (there being no longer any pressure)
the flow of grease stops. The amount of the feed can be observed by a check device,
if desired, and controlled by tightening or loosening the regulating screw.
There are many slight modifications which may be made in the lubricator described
above without departing from the nature of my invention. Instead of a central
spindle and movable piston, I might employ, for example, a piston and piston rod
connected therewith, forced on the grease by means of a spring with a regulating nut.
Dated this 17th day of September 1889.
WM. P. THOMPSON & Co.,
Of 6, Lord Street Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Lubricators for Solid or Semi-solid but Plastic
Lubricants.
I, GEORGE HEY STUART, of 17, City Walls, Chester, in the County of Chester,
Merchant, 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 has for its object a lubricator for solid or semi-solid but plastic
lubricants, having a device adapted for forcing out the lubricant continuously by
pressure from the cup on to the bearing, and means for controlling the said pressure
and the amount of lubricant delivered.
The invention may be described as follows, reference being had to the accom-
panying drawing which shows an elevation, partly in section, of my improved
lubricator.
A is the cup of the lubricator, adapted to contain the fat or other solid. or semi-
solid lubricant. The bottom of the cup communicates by several small holes a with
the tubular shank B, which conveys the lubricant to the bearing.

page_text: if
The cup is provided with a central guiding spindle Cupon which a piston (such
as D) may slide, or, what is the same thing, the piston D may be a fixture and the
cup A may slide upon it and upon the spindle C, as shown in the drawing. The
piston is, by preference, grooved on its periphery, as at d, and said groove may,
desirable, be provided with suitable packing. When the piston is a fixture, it is more
convenient to form it in one piece with the shank, as shown, the holes a being continued
through it into the cup.
The spindle Chas, at its upper part, a screwed thread cupon which rides a milled
nut E. Between the nut E and the top of the cup-or between the nut and the
piston, when the cup is a fixture.and the piston slides upon the spindle-there is
interposed a spring ; the pressure of which can be regulated by the nut.
The lubricator is manipulated as follows:-
The nut E and spring being removed, the cup is withdrawn to a distance sufficient
to enable it to be filled with lubricant. The cup being filled it is pressed down
towards the piston, so that the lubricant is forced against the latter. When the cup
has assumed the position shown in the drawing, the spring and nut are replaced, the
latter being screwed down upon the regulating screw in such manner that the spring
causes the lubricant to be forced at the required pressure, that is, at the required rate,
through the perforations a, and down the stem B to the part to be lubricated. The
spring gradually expands until after a certain time, which time may be regulated
by the nut, its elasticity is expended, and the lubricant ceases to flow. The amount
of the feed can be observed by a check device, if desired, and controlled at will by
tightening or loosening the regulating nut E.
There are many slight modifications which may be made in the lubricator without
departing from the essence of the invention. For instance, instead of a central fixed
spindle and movable piston, I might employ a spindle or rod movable with the piston,
and either fixed to it or formed in one therewith. In this case, the cup would be a
fixture, and the spring, F, being interposed between the nut E and cup, as shown, it
would force the piston upwards against the lubricant, so that the litter would be
pressed through holes in the piston and into the feed tube.
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 :-
In a lubricator for solid or semi-solid plastic lubricants having a containing cup and
a piston sliding one upon the other, the arrangement of pressure spring and regulating
nut, whereby the pressure exerted on the lubricant may be adjusted at will, and a
variable feed obtained, substantially as described.
Dated this 17th day of June 1800
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, and London, Patent Agents.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, and London, Patent Agents.