IMPROVEMENTS IN LUBRICATORS
Year: 1877

page_text: LETTERS PATENT to Sydney Pitt, of Sutton, in the County of Surrey, for the
Invention of "IMPROVEMENTS IN LUBRICATORS." A communication from
abroad by Felix Isidoro Millet, of Persau, Departement de Seine et Oise,
France.
"
Sealed the 30th November 1877, and dated the 13th June 1877.
PROVISIONAL SPECIFICATION left by the said Sydney Pitt at the Office of
the Commissioners of Patents on the 13th June 1877.
"IMPROVEMENTS IN
SYDNEY PITT, of Sutton, in the County of Surrey.
LUBRICATORS." [A communication from abroad by Felix Isidore Millet, of Persan,
Departement de Seine et Oise, France.]
This Invention has for its object improvements in lubricators, and is applicable
to parts of machines mounted upon shafts or axos, so as to be able to turn thereon,
such, for example, as loose pulleys to receive a driving belt whilst the machine
remains at rest.
The lubricator consists of a cylindrical or other vessel attached to the pulley or
other moving part, and charged with the lubricating liquid.
When the pulley or other part is in motion, centrifugal force tends to drive the
liquid towards the outer end of the cylinder or vessel away from the shaft or axis ;
and there is a small tube or passage connecting this end of the vessel with the boss
or centre of the pulley or other part at the point were the lubrication is required.
Within the lubricating vessel and behind the liquid there is a piston (or its
equivalent) of greater specific gravity than the lubricating liquid, and which
consequently, being more strongly influenced by the centrifugal force, compels the
lubricating liquid to pass by the tube or passage before mentioned to the boss or
centre of the pulley or other part.
The flow of the lubricating liquid is moderated to any extent desired by suitably
obstructing the tube or passage.

page_text: Figure 1 represents an apparatus constructed according to this Invention, and
which has a lubricating action during the whole time that the pulley which carries
it continues in rotation.
In a glass cylinder A, containing the lubricating matter, there slides with a slight
friction the leather piston B. It is furnished with a leaden crown C, which under
the action of the centrifugal force presses upon the lubricating matter contained in
D, and compells it to pass by the tube E to the rubbing parts. A stem G either
plain or grooved and of suitable size regulates the flow according to the require-
ments. The screw plug H permits of the introduction of a small metallic rod to
push back the piston to its starting point when the apparatus is empty. It also
serves to admit the lubricating matter to refill the apparatus. A spring J presses
the piston outwards and prevents the flow continuing when at rest.
Figure 2 represents another form of the apparatus; it works like that already
described; but it is protected from voilence by a metallic case, open to allow the
interior of the apparatus to. be seen. An additional piece K serves when necessary
for fixing to the arm or middle body of the pulley as well as to the boss.
Figure 3 shows another form of the apparatus working intermittently. When
it is.put into motion the piston B diminishes the interior capacity D, and expells
the lubricating matter by the tube E; but as soon as the movement ceases the
spring L returns the piston to its starting point, and air enters the apparatus.
The same thing takes place each time that the apparatus is put into motion.
The piston may, it will be seen, be replaced by a flexible membrane working in a
similar manner.
Figure 4 represents another form of the apparatus working intermittently like
that last described, but it differs in that it is provided with a retaining valve M
The air in place of entering by the passage at which the outflow takes place, enters
:

page_text: by a pipe N. In place of being fixed like the apparatus represented in the
preceding Figures, it is fixed to the periphery, but it may be mounted like the
others; or these may be fixed to the felly, as in Figure 4.
In other cases arrangements shown in one of the Figures will be found applicable
to others.
Having thus described the nature of the said Invention and the manner of
performing the same, I would have it understood that I claim,―
First. The construction of lubricators with weighted pistons or their equivalents,
which being driven outwards by centrifugal force cause the lubricating material to
pass to the rubbing surfaces which it is desired to lubricate.
Second. The construction of lubricators, substantially in the manner herein
shown and described.
In witness whereof, I, the said Sydney Pitt, have hereunto set my hand and
seal, this Eleventh day of December, in the year of our Lord One thousand
eight hundred and seventy-seven.
SYDNEY PITT. (L.S.)