Improvements in Fluid-pressure Power Motors.
Year: 1898

page_text: Date of Application, 7th July, 1898-Accèpted, 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 motor which works with a reciprocating
piston, but in which the reciprocating movement of the piston is not converted
into rotary motion by means of a crank but is converted through the medium of
a worm or endless screw.
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; the driving shaft,
bearing and fly wheel on one side being omitted.
Figure 2 is a sect on on the line A-B of Figure 1.
The cylinder 1, as also bearings 3, that carry the main shaft 2, are fastened in
the usual manner by bolts to the engine bed-plate. Upon the main shaft 2 are
mounted the fly wheels 4, from which the power can be taken direct or by means
of special belt pulleys and transmitted to the machine to be driven.
In the whole length of the bore of the cylinder 1, there is inserted a segment
of a cylinder 5, so that the cylinder is rendered flat on one side and preferably
on the side where the valve chest 7, is situated, and this prevents the piston 6,
working therein from moving round on the main shaft 2. The valve chest 7, is,
as in other steam engines, bolted to the cylinder, and inside of it there works
the slide valve 9, which reciprocated by means of the slide valve rod 8. The
slide valve may be constructed as an ordinary D-valve or as a hollow valve, and
generally its construction may comprise all the modifications of the slide valves
as used with other steam engines. The steam supply pipe is bolted to the
union 10. 11 are the steam inlet ports for the cylinder, whilst 12 indicates the
exhaust opening. The piston 6, which moves to and fro in the cylinder but
which is prevented from rotating in the cylinder by means of the aforesaid
flattening produced by the segment 5, consists of the two piston halves 61 and 611
which are connected together by means of stay bolts 13. To each of these piston
halves or piston plates there is holted by means of a flange 14, a pipe 15 which is
made completely steam tight externally by means of the stuffing boxes 171
and 17 which pass through the cylinder covers 16 and 16". The main shaft 2,
passes steam tight through this pipe 15. It is preferable to make the joint
between the pipe and the shaft by means of a suitable jointing device at the ends
of the pipes. The means employed for this purpose are the usual ones, such as
stuffing boxes or the like. The length of the pipes depends on the length of the
evlinder that to say the length of the stroke, as will be perceived from the
following statements:-
For about the same length as the cylinder there is cut in the main shaft 2 a
groove with a very wide pitch similar to that which is usually employed in drills

page_text: or boring tools. This groove has a double thread, that is to say, two grooves
intersect each other at a suitable angle, one of the said grooves being left-handed
whilst the other groove is right handed. Inside piston 6, there are formed two
nuts 18 and 19 which are provided externally with ratchet teeth but which are
made smooth on their adjacent contact surfaces. Of these nuts, one works on
the left handed screw thread of the shaft 2, whilst the other nut works on
the right-handed screw of the said shaft. Two rings 20 and 21 provided with
ratchet teeth are fixed to the piston 6, and engage with ratchet teeth of the
nuts 18 and 19 situated nearest to them. The mode of operation of the machine
will be clearly understood without further description. The piston 6, with the
jointing pipe 15 attached thereto is caused to make a to-and-fro movement as a
consequence of the distribution of the steam which is dependent on the rotation
of the main shaft as is the case in other power engines. In consequence of this
to-and-fro movement the two nuts will be caused by means of the ratchet teeth
to become coupled alternately with the corresponding sides of the piston, and by
reason of their engagement with a corresponding groove cutting in the shaft to
cause this shaft to rotate. The other nut works in this case idly in this groove
and rotates in contact with the working nut.
The motor as will be perceived without further description from the construc-
tion, can be worked equally well with steam, compressed air or even with water.
The lubrication of the working parts is effected in any of the usual modes by
means of oil, solid fat or the like. The constructional arrangement of the various
parts may be of any desired kind and suited to the various purposes.
tions of this kind cannot affect the scope of the patent in any way.
Modifica-
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 power motors in combination, a two part piston 6 prevented from rotat-
ing in its cylinder, a slide valve such as 9 to distribute the working fluid and]
reciprocate the piston, two nuts alternately connected to the piston 6 by means of
couplings or clutches and gearing alternately in a double spiral cut in the main
shaft 2, and suitable packings upon the main shaft all operating substantially as
herein before described.
2. The improved power motor for converting reciprocating motion directly
into rotary motion without the interposition of a crank, substantially as herein-
before described with reference to the accompanying drawings.
·
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.