Improved Lubricator.
Year: 1896

page_text: Date of Application, 24th Oct., 1896-Accepted, 2nd Jan., 1897
COMPLETE SPECIFICATION.
Improved Lubricator.
I, WILHELM MICHALK, of Dresdener Strasse 23 Deuben C/ Dresden in the
Kingdom of Saxony and Empire of Germany, Manufacturer, 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 relates to some improvements in what are called lubricating
presses, in which the lubricant forced from a cylinder by a piston is intermittently
and drop by drop fed to the part to be lubricated.
One of these improvements is automatically to stop the piston when it has
reached its lowest position so that such piston will not move farther in the direction
of its stroke, nor turn. Another improvement has for its object to render more
perfect the construction of the controlling mechanism which effects the forward
movement of the piston so that the least movement of the controlling lever will
with certainty cause rotation of the driving spindle. By latter improvement is
attained that the lubricant is forced from the press-cylinder to the part to be
lubricated in the smallest admissible quantities whereby waste of lubricant is
avoided.
In the accompanying drawings these improvements are shown applied to a
lubricating press, represented in Fig. 1, partly in section, partly in elevation;
Fig. 2, shewing a detail of construction.
For automatically disconnecting the piston the following arrangement is used:
The nut of the screw spindle S which drives the piston k, is not fixed to the
piston k as is usual, nor is the female thread cut into the piston, but a separate
nut a is provided in the piston k so as to be free to rotate. In order to guide the
piston in a straight direction an arm a¹ is provided on the nut a, the forked portion
of which engages with a rib r on the pump-frame and is guided by this rib when
the piston descends. By reason of this arrangement the nut a can only move in a
straight line, whilst the arm a' is guided on the rib r.
The length of the guide rib is so chosen that the arm a¹ will cease to be in
contact therewith and be no longer guided thereby when the piston k has reached
the lowest point of its stroke, as shown in Fig. 1. From that moment the nut a
can participate in the rotary motion of the screw spindle S without transferring
the same to the piston k. From that moment therefore the piston has neither a
rectilineal motion, nor does rotary motion take the place thereof. The latter being
obviated, neither the piston nor the packing of the same suffer by wear after the
press has ceased to be operative.
In cases where a high pressure acts on the piston from the part to be lubricated,
for instance in steam engines working with steam under high pressure, this pressure
becomes perceptible at the surface where the piston k touches the nut a and also
where the collar g on spindle S touches the bearing of the latter, and this produces
considerable friction at these two points. In order to prevent, on the one hand,
the nut a becoming unable to turn in the piston k and forcing the latter to turn
with it when it should be stationary, on the other hand to avoid excessive
expenditure of power in overcoming such friction and the consequent wear of the
working parts that transmit motion, which would injure the same, ball bearings /
and respectively, are provided between the piston k and nut 2, as well as between
collar and the bearing of spindle S, see Fig. 1.

page_text: The improvement in the controlling mechanism of the lubricating press is shown
in Figs. 1 and 2 of the drawings.
It relates to the pawls c provided on the lever h, the disc d operated by said pawls
and consists substantially in providing the pawls c with several acute-angled teeth c¹,
by which they engage with the plain inner side of the rim d' of disc d, actuating
the latter when lever h swings forward.
These teeth, as soon as lever h moves forward, are forced into the rim d' of
disc d, and consequently the latter is also forthwith set in motion. By reason of
this arrangement the loss of motion which takes place with both toothed gear and
friction gear, is entirely avoided and hence the controlling lever h without losing
any of its motion acts to operate the rest of the mechanism and therefore the
piston. It follows that the smallest amount of motion can be given to said lever,
and thus the lubricant may be fed to the part to be lubricated in the smallest
particles.
Having now particularly described and ascertained the nature of my inven
tion and in what manner the saine is to be performed, I declare that what I
claim is :-
In a lubricating press the following improvements:
1. The nut a of screw spindle S so arranged in piston kas to be capable of
rotation in consequence whereof the rotary motion of spindle S is not transmitted
to piston k even after completion of the rectilineal motion of the latter.
2. The employment of ball bearings between piston k and the nut a, and a
similar bearing between collar g and the bearing of the screw spindle S so as to
diminish the friction produced at these two points by the pressure opposed to the
piston k.
3. The teeth c¹ having teeth with acute-angled points, whereby the pawls c
are made to engage with the rim d' of the controlling disc d at the very com-
mencement of their motion, so that all loss of. motion in the transmitting gear
is avoided.
Dated the 24th day of October 1896.
NEWNHAM BROWNE,
Agent for the Applicant.