IMPROVEMENTS IN LUBRICATORS FOR BEARINGS AND OTHER PARTS OF MACHINERY."
Year: 1881

page_text: LETTERS PATENT to John Davis, of No. 158, Great Dover Street, Borough,
in the County of Surrey, for an Invention of "IMPROVEMENTS IN LUBRICATORS
FOR BEARINGS AND OTHER PARTS OF MACHINERY."
PROVISIONAL SPECIFICATION left by the said John Davis at the Office of
the Commissioners of Patents on the 1st December 1881.
JOHN DAVIS, of No. 158, Great Dover Street, Borough, in the County of Surrey.
"IMPROVEMENTS IN LUBRICATORS FOR BEARINGS AND OTHER PARTS OF MACHINERY.'
This Invention has for its object improvements in lubricators for bearings and
other parts of machinery.
I construct a lubricator as follows:-A boss, which screws or is inserted into the
oil hole of the bearing or other part forms the foot of the lubricator.
Upon this font a glass bowl serving as the oil reservoir is supported; it rests upon
a leather washer, and it has a hole through the bottom.
The lower end of a metallic standard passes through the hole in the glass bowl,
and screws into a socket prepared for it in the foot.
A cover for the bowl or oil reservoir is forɩned upon the upper part of the
standard; a ring of packing is inserted into a groove in the under side of the
cover, and as the standard is screwed into its socket this packing comes against the
upper edge of the bowl with a pressure sufficient to make tight the joints both
at the top and bottom of the bowl.
Sometimes I employ a glass of cylindrical form.
There is a hole through the cover for supplying oil; it is provided with a stopper
which is hemispherical on the under side, and is held in its place by a coiled spring
passing to a lug on the standard. The spring admits of the stopper being easily
displaced by the spout of the oil can used to pour in oil, but draws the stopper
back to its place directly the spout is removed.
The standard is hollow, an oil duct being formed in it communicating with the
interior of the oil reservoir at a short distance from the bottom. A plug is also screwed
into the standard from the top; it terminatos in a cone or point entering into the oil

page_text: duct, which it closes more or less as the plug may be set; it serves to regulate the
quantity of oil supplied, and by it the flow may be stopped when the machinery is
not in action. But this is not usually found to be necessary, as the oil ceases to
flow when the machinery is standing; the channel between the bearing and the
lubricator becomes filled with oil, thus stopping its further discharge.
· A lock nut is provided upon the screwed part of the plug.
A similar lubricator can be constructed with a metal bowl or oil reservoir, which
then can be formed of a piece with the foot. The cover carrying the stopper and
screw plug can also be screwed into the mouth of the metal bowl.
In place of the external stopper drawn inwards by a spring, a stopper within the
oil vessel pressed outwards by a spring may be employed.
In some cases the adjusting plug may be entirely within the oil vessel; the
lubricator would then be filled either by removing the cover or by means of a
small hole formed in the cover screwed to receive a stopper.
I sometimes make the reservoir in a piece and solid with the bearing or part to be
lubricated. In this case the standard would be screwed into it.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Davis in the Great Seal Patent Office on the 1st June 1882.
JOHN DAVIS, of No. 158, Great Dover Street, Borough, in the County of Surrey.
"IMPROVEMENTS IN LUBRICATORS FOR BEARINGS AND OTHER PARTS OF MACHINERY."
This Invention has for its object improvements in lubricators for bearings and
other parts of machinery.
I construct a lubricator as follows:-A boss, which screws or is inserted into the
oil hole of the bearing or other part forms the foot of the lubricator.
Upon this foot a glass bowl serving as the oil reservoir is supported; it rests
upon a leather washer, and it has a hole through the bottom.
The lower end of a metallic standard passes through the hole in the glass bowl,
and screws into a socket prepared for it in the foot.
A cover for the bowl or oil reservoir is formed upon the upper part of the
standard; a ring of packing is inserted into a groove in the under side of the cover,
and as the standard is screwed into its socket this packing comes against the upper
edge of the bowl with a pressure sufficient to make tight the joints both at the top
and bottom of the bowl. Sometimes I employ a glass of cylindrical form.
There is a hole through the cover for supplying oil; it is provided with a stopper
which is hemispherical on the under side, and is held in its place by a coiled spring
passing to a lug on the standard. The spring admits of the stopper being easily
displaced by the spout of the oil can used to pour in oil, but draws the stopper
back to its place directly the spout is removed.
The standard is hollow, an oil duct being formed in it communicating with the
interior of the oil reservoir at a short distance from the bottom. A plug is also
screwed into the standard from the top; it terminates in a cone or point entering
into the oil duct, which it closes more or less as the plug may be set; it serves
to regulate the quantity of oil supplied, and by it the flow may be stopped when the
machinery is not in action. But this is not usually found to be necessary, as the
oil ceases to flow when the machinery is standing; the channel between the bearing
and the lubricator becomes filled with oil, thus stopping its further discharge.
A lock nut is provided upon the screwed part of the plug.
Figures 1 and 2 are vertical sections of lubricators of this construction. In
Figure 1 the glass is of a cup like form, in Figure 2 it is cylindrical.
a is a boss adapted to screw into the oil hole of a bearing.
b is the bowl or cylindrical glass.
c is the central standard; it screws into a socket in the part a, and is
perforated at c', c'.
d is the cover; it is formed of a piece with the part c.
e, e, is packing forming tight joints at the top and bottom of the glass.
fis the stopper for the oil hole, and f¹ is its spring.
g
is the regulating cone or plug screwing into the standard c.
is a lock nut.
A similar lubricator can be constructed with a metal bowl or oil reservoir, which
then can be formed of a piece with the foot. The cover carrying the stopper and
screw plug can also be screwed into the mouth of the metal bowl.
Figure 3 is a vertical section of a lubricator of this construction. Figure 4 is a

page_text: Figures 5, 6, 7, and 8 represent lubricators with the adjusting plug within.
Figure 8 is adapted to be filled without removing the cover, but by pressing upon
the central projecting stud perforations in the lid are uncovered.
I sometimes make the reservoir in a piece and solid with the bearing or part to
be lubricated. In this case tho standard would be screwed into it. Figure 9
represents a vertical section of a lubricator of this construction.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that I claim my improved
lubricators substantially as described.
In witness whereof, I, the said John Davis, have hereunto set my hand and
seal, this Twenty sixth day of May, in the year of our Lord One thousand
eight hundred and eighty two.
TAX