IMPROVE- MENTS IN LUBRICATING FLASKS
Year: 1878

page_text: LETTERS PATENT to Carl Pieper, Civil Engineer and Patent Agent, of 74,
Belle-Alliance-Strasse, Berlin, S. W., Prussia, for the Invention of "IMPROVE-
MENTS IN LUBRICATING FLASKS." A communication from Carl Greif, Coburg,
Germany.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office
of the Commissioners of Patents on the 12th October 1878.
CARL PIEPER, Civil Engineer and Patent Agent, of 74, Belle-Alliance-Strasse,
Berlin, S.W., Prussia. "IMPROVEMENTS IN LUBRICATING FLASKS." A communi-
cation from Carl Greif, of Coburg, Germany.
This Invention relates to a lubricating flask from which the oil is ejected by a
pressure of the fingers on certain elastic parts of the same.
Hitherto lubricators of this kind have been made entirely out of metal with a
spring bottom by means of which, the lubricator being inverted, the oil is pressed
out through the outflow pipe.
My improved lubricating flask consists of a glass vessel, having its mouth closed
by a membrane of india-rubber, leather, or other flexible and impermeable material,
in the middle of which the outflow pipe is fixed, so that oil will be ejected by
pressing the said pipe towards the interior of the inverted flask.
The outflow pipe after having been relieved of the inward pressure of the fingers
may be caused to spring back by the elasticity of the membrane itself or by means
of a special spring. In the first case the membrane must be made of india-rubber
of sufficient thickness and by preference of spherical form, the convex side being
turned outward. If however a thin membrane of india-rubber or leather, &c., is
used a spring must be applied for the said purpose. This spring acts on a collar
on the outflow pipe and abuts against a cover screwed to the neck of the flask and
serving for holding down the edge of the membrane.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Pieper in the Great Seal Patent Office on the 9th April
1879.
CARL PIEPER, Civil Engineer and Patent Agent, of 74, Belle-Alliance-Strasse,
Berlin, S.W., Prussia. "IMPROVEMENTS IN LUBRICATING FLASKS." A communi-
cation from Carl Greif, of Coburg, Germany.
This Invention relates to a lubricating flask from which the oil is ejected by a
pressure of the fingers on certain elastic parts of the same.
Hitherto the flasks or bottles of lubricators of this kind have generally been
made of metal with a spring bottom by means of which, the lubricator being
inverted, the oil is pressed out through the outflow pipe. These lubricators
however present certain inconveniencies. Firstly, the oil, which is seldom free
from acid, tends to oxydize and to dissolve the metal out of which the flask is
made, the oil being thereby adulterated and caused to become thick; secondly, the
repeated bending of the metallic bottom soon gives rise to cracks and conse-
quently of leakage along the seams, which is especially disagreable when the
lubricator is used with sewing machines.
My improved lubricating flask consists of a glass vessel, having its mouth closed
by a membrane of india-rubber, leather, or other flexible and impermeable material,
in the middle of which the outflow pipe or nozzle is or may be fixed, so that oil will
be ejected by pressing the said pipe towards the interior of the inverted flask.
The outflow pipe after having been relieved of the inward pressure of the fingers
may be caused to spring back by the elasticity of the membrane itself or by means
of a special spring. In the first case the membrane must be made of india-rubber
of sufficient thickness and by preference of spherical form, the convex side being
turned outward. If however a thin membrane of india-rubber or leather &c., is
used a spring must be applied for the said purpose. This spring acts on a collar on
the outflow pipe and abuts against a cover screwed to the neck of the flask and
serving for holding down the edge of the membrane.
In Fig. 1 of the accompanying Drawings a lubricating flask is represented in
which the mouth of the flask e is closed by a strong india-rubber membrane k,
having by preference the form of a cap. This cap or elastic part of other shape is
held in its place by a ring d of metal, horn, ebonite, or other suitable material
which is screwed or otherwise attached to the neck of the flask.
The outflow tube a is fastened to the middle of the said part k. It is evident
that when this flask is inverted and a pressure is exercised by the fingers against
the collar b, the thumb being applied to the bottom of the flask, the elastic cap will
be bent inward so as to compress the air within the flask whereby oil is ejected
by tube a. When the cap is relieved of pressure it springs back on account of its
inherent elasticity.
In the modified arrangement of Fig. 2 a thin disk of india-rubber or leather is
substituted for the cap k, and as this disk would not have sufficient tension always
to re-assume its original shape after having been pressed inward, a spring fis
combined with the same for drawing its centre outward. This spring presses
against a coller on tube a while it abuts against the cover d, through which the
part g of the outflow tube passes freely. When a pressure is exerted against the
collar of tube a of this arrangement oil will be ejected as in the first case.
Instead of using india-rubber for the membrane or cap k of Fig. 1, this part may
also be constructed of a convex or corrugated disk of metal, horn, or ebonite,
sufficiently thin to spring under a pressure of the fingers, and the said disk may be
soldered or otherwise attached to the rim or ring & according to the nature of the
material employed, or it may be made out of one piece with the latter. A lubri-
cating flask of this description is represented by Fig. 3; c is a packing ring of
leather or india-rubber.

page_text: Fig. 4 finally shows a modification of Fig. 3 in which the outflow tube a is
fixed laterally to the flask. This mode of attaching the tube may also be used with
the arrangement of cap of Fig. 1.
Having thus described the object and nature of this Invention and the manner
in which it is to be carried out in practice (as communicated to me by my corre-
spondent), I claim as new and important features of the same,-
The combination with a lubricating flask consisting of glass of an elastic or
springing cover, substantially in the manner and for the purpose described.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Sixth day of March, in the year of our Lord One thousand eight
hundred and soventy-nine.
CARL PIEPER. (L.S.)