Improvements in and relating to Sight Feed Lubricators.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Sight Feed Lubricators.
1, ARCHIBALD WELSH, of Carrick Brass Works, in the Town and County of
Ayr, Brassfounder, do hereby declare the nature of my invention, and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement in writing, that is to say :-
This invention has reference to and comprises improvements in the construction
or arrangement and combination of the parts of sight feed lubricators, whereby in
the eveut of a sight glass getting broken, the pressure steam and oil supply can be
instantaneously shut off, and a new glass easily and expeditiously inserted.
And in order that my said invention and the manner of performing or carrying
the same into effect or practice may be properly understood I have hereunto
appended an explanatory sheet of drawings, in which Figure 1 represents a
sectional elevation, and Figure 2 an external view at right angles thereto, showing
a sight feed lubricator as constructed in accordance with my improvements.
Referring to these drawings, the improved lubricator is formed with a cential
hollow stem A, screwed at its lower part A', for connecting to the bearing or part
to be lubricated, and having an upper oil containing vessel or cistern B, preferably
formed in one casting with the lower stem A. An orifice B2 is formed at the
upper part of the vessel B, for filling it with oil, and is covered in by a hand screw
plug B. A channel or passage a is formed in the lower central stem A, and a
central tube is screwed or fitted into the bottom B¹ of the vessel B, so as to be in
line with the orifice a and form a passage for steam pressure to act in the upper
part of the oil vessel B, as hereinafter described.
By my improvements a projecting arm or bracket C is cast on, or screwed or
fitted to, the stem A, and has a hollow channel or passage c, formed through it com-
municating with the passage a in the stem A, and a hand spindle C₁, is fitted at the
outer end of this arm to work through a screwed stuffing box C², and by its
tapered point c regulate or control the supply of fluid through the orifice c. A
hollow recess or stem (3 with an orifice c² is formed at the upper outer end of the
bracket arm C to receive the lower end of a sight feed glass G, while the upper
end of this glass would be inserted and secured within a hollow stem D³, on the
outer end of an upper projecting arm or bracket D cast on, or screwed or fitted
below the vessel B or above stem A. A plug or cover D' is screwed or fitted into
the hollow stem D³ and has a kneed orifice formed in it, leading by a narrow or
tapered end nipple d' into the glass tube G. A ground cock or plug E is fitted in
an orifice or recess formed between the bottom B of the oil vessel B, and the upper
part of the central stem A, and is formed with a through orifice e to communicate
with the central passages a and b when turned into position to do so; while.a knee
orifice or branch e', e', is similarly formed at the inner end of this cock E to form a
communicating passage for the oil from the vessel B, through it and through the
orifice d² and knee branch d to the sight glass G, and an open space e² may be left
between the end of the cock e and the passage d². The cock E is formed with a
spindle E passing through a stuffing box E2 and fitted with a handle E³ outside.
While a hand pointer E is mounted over the spindle E' to turn with it, and visibly
indicate by its position in front of the vessel B whether the cock is in its open or
shut positions and the steam pressure on or off the oil.
The action of the apparatus is as follows:-In the working position of the
lubricator the cock E, E, is turned so that the orifice e is in line with the passages a
and, and the orifice e in line with the orifice d². The steam pressure will
therefore pass up through the hollow body a of the stem A, and through the
orifice e and tube inte the upper part of the vessel B, where it will act on the oil

page_text: and force it through the channels e, d², and d, into the sight feed glass G. The
screw spindle C will then by its tapered end c¹ regulate the supply of oil from the
glass G, through the channel c to the passage a leading to the part to be lubricated.
Should the glass G get broken, or the supply of lubricant be desired to be stopped,
the handle E³ is turned to shut off communication through the passage e between
the channels a, and b, and thus stop the supply of steam pressure to the oil
vessel B; while by screwing inwards the spindle (the passage of oil is shut off
from the glass G and the inward passage of steam through the channel e also closed,
so that by unscrewing the cap D₁ the broken glass can be removed and a new one
immediately replaced, and the hand spindles be then turned for the working of the
lubricator to go on as before described.
The improved lubricator although described as worked by steam pressure, is
equally applicable for working with air or other pressure fluid, the oil being fed by
gravity.
Figures 3 and 4 show a vertical and a horizontal section respectively through
the screw plug D¹. In this arrangement instead of forming a knee orifice, an
annular groove d³ is formed round the plug D', with lateral branch passages (*,
for leading the oil by the vertical passage d, d', to the glass G.
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 :-
First. The construction or arrangement and combination of the parts of a sight
feed lubricator with steam shutting off and indicating mechanism and glass retain-
ing and replacement fittings, substantially as and for the purposes herein described
in reference to and shown in the accompanying drawings.
Second. In sight feed lubricators the forming on or fitting to these of lateral
projecting arms with fluid passages to retain and enable a glass to be replaced, and
to feed the supply of oil and shut off the steam pressure if required, substantially as
and in the manner described with reference to the accompanying drawings.
Third. In sight feed lubricators, the forming of a channel or passage from the
oil vessel laterally through the stop cock and upper projecting arm to the sight
feed glass, substantially as herein described with reference to the accompanying
drawings.
Dated the 13th March 1893.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.