Improvements in Fluid Pressure Power Motors.
Year: 1898

page_text: Date of Application, 7th July, 1898-Accepted, 3rd Sept., 1898
COMPLETE SPECIFICATION.
Improvements in Fluid Pressure Power Motors.
I, ZDZISLAV MAEVSKY, of Vozniesniensky Prospecte No. 38, log., Nr. 53, St.
Petersburg, in the Empire of Russia, Engineer, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention relates to a power engine which works with a reciprocating
piston but in which the reciprocating motion of the piston is not converted into
rotary motion by means of a crank, but is converted through the medium of
worms or endless screws.
Whereas a specification filed concurrently by the present applicant relates to
a power motor in which the nuts gearing with the worms or screws are situated
inside the piston, the present invention relates to an engine in which the said
nuts are arranged outside the said piston.
The means for carrying the invention into effect are illustrated in the accom-
panying drawings as follows:-
Figure 1 is a longitudinal section through the engine.
Figure 2 is a section on a line A-B of Figure 1.
The cylinder 1 of the engine consists of three parts of which the cylinder
proper 1, contains the annularly shaped piston 2, whilst the parts 11 and 12
forming extensions thereof contain the nuts with the coupling devices.
The main shaft 3 of the engine runs in bearings 4 and 5 and carries the fly
wheels 6. It consists of a central smooth portion and of two parts connected
therewith provided with endless screws or worms cut in the same; of these the
one worm runs in a left hand fashion round the shaft whilst the other worm runs
in a right hand direction around the same. Upon these worms are mounted the
working nuts 7 and 8 which are adapted to be coupled alternately by means of
ratchet teeth with the shaft 3. The coupling of the same is effected by means
of operating rods 9 and 10, which are carried in a steam tight manner through
the walls of the main cylinder 1, and are bolted to piston 2. The coupling rods 9
and 10 are provided with bridge pieces 11 and 12 of which the outer one 12 is
provided with an annular ratchet which corresponds with the ratchet situated
on the opposite side of the nuts 7 and 8, so that on a suitable movement of the
piston 2 these catches are caused to engage with each other, whilst the nuts 7
and 8 are prevented from rotating by the engagement of the locking device, and
by the further movement of the nuts 7 and 8 the force exerted upon them by the
piston is transmitted through the medium of the incised worms to the shaft and
to the fly wheels. From the latter the power is then transmitted in one of the
generally known ways to the machines to be driven.
In this case also the piston is prevented from rotating and in the present
engine this is effected by means of the operating rods 9 and 10 which are carried
by means of stuffing boxes through the fixed walls that form the compartments
of the cylinder. The distribution of the steam in the main cylinder 1 is effected
in the usual manner by means of one of the known valve gears which is operated
by the slide valve rod 13. The nut which is not working at the time is dis-

page_text: engaged from its catch during this period and rotates with its smooth surface
freely against the inner connecting rod.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is: —
1. In improvements in power motors in combination, a central cylinder with
an annular piston reciprocated upon a central shaft 3, a slide valve to distribute
the working fluid and reciprocate the piston, operating rods 9 and 10 attached
to and reciprocated by the said piston and moving alternately into and out of
gear two nuts 7 and 8 which rotate the central shaft by operating respectively
upon right and left hand threads cut therein, locking ratchets engaging alternately
with similar ratchets upon cross bars 12 so that while one nut is operative the
other is loose and free to rotate and all operating substantially as hereinbefore
described.
2. The improved power motor for directly converting reciprocating into rotary
motion substantially as hereinbefore described with reference to the accompany-
ing drawings.
Dated this 7th day of July 1898.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.