Year: 1895

page_text: Date of Application, 3rd Sept., 1895-Accepted, 26th Oct., 1895
I, HERMANN GRACEL of Paulstrasse, Berlin, 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 a rotary motor in which the pressure medium such as
steam, compressed air or explosive gas presses against the inclined planes formed
by the windings of two oppositely screwed taper or parallel bodies mounted to
rotate in a common casing.
In the accompanying drawing which illustrates the invention Fig. 1 is a cross
section of the motor casing and Fig. 2 a sectional view of the motor.
m is the motor casing. s, s', shafts on which are fixed two taper bodies with
oppositely cut screw threads. Said screwed bodies approximately fit the inner
periphery of the casing. h are hollow spaces formed by the casing and the screw
threads, and leading from one end to the other of each screwed body, one winding
hollow space for each screw with a single thread, two with a double thread and so
If the pressure or driving medium, steam for instance is admitted at the
inlet a rotation of both of the screwed bodies will take place, the hollow
windings h moving in the direction of the steam outlet c. This rotation is
effected by the pressure of the steam on the windings on the principle of the
inclined plane.
on.
For the purpose of insuring a regular motion of the motor the shafts s, s¹, are
connected together by two toothed wheels 2, 1, or by other suitable means.
If the screws are formed with an increasing pitch and either taper or parallel
the hollow spaces will increase in dimensions from one end to the other,
consequently the steam admitted thereto will operate expansively, and with the
taper form of screw body as shewn, the hollow spaces will be more considerably
increased in dimensions than with parallel screwed bodies. Greater expansion
may be obtained by means of intermittent steam admission as in the case of other
motors and the effect may be increased by the application of condensing apparatus.
An increase of power may also be obtained by the admission of auxiliary steam to
the casing m through steam pipes a and valves a¹ whereby the expanding steam
may be again brought up to full pressure.
Turning on point is a freely moving support W for the screw shafts s, s¹. With
tapering screw bodies the clearances between the screws and the screws relatively
to the casing are adjustable by a screw d.
The power may be transmitted from the motor through a pulley t or t¹. To
reverse the motor the steam may be admitted at c and after a revolution be
discharged through orifice b, from the casing.
The motor may be used as a pump by suction at e induced by pressure passing
through pipes a, valves al and outlet b or the discharge of steam may take place
at c for suction through different independent suction pipes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A motor consisting of screwed taper bodies placed within a casing and engaging

page_text: in one another in the manner that the hollow spaces h repeatedly formed in the
rotation of said screwed bodies by the screw windings by the casing and by the
engaging parts of one of the screwed bodies, are increased in dimensions from one
end to the other of said screwed bodies, for the purpose of using the driving
medium expausively, substantially as described and shewn.
2. In the motor referred to the arrangement of parallel cylindrical screwed
bodies placed within a correspondingly constructed casing and having their screw
windings or hollow spaces enlarged between their two ends for the purpose specified,
substantially as described.
3. In the motor referred to the arrangement of auxiliary inlets to the casing, for
the purpose specified, substantially as described and shewn.
4. In the motor referred to the arrangement of a freely moving support W by
which the screwed bodies are automatically held mutually adjusted, substantially as
described and shewn.
5. In the motor referred to the arrangement by which the driving medium enters
through the pipe c and after a revolution exhausts from the casing, for the purpose
of reversing the motor.
6. The principle of the motor hereinbefore described and shewn in the drawing.
Dated this 3rd day of September 1895.
CAPITAINE & VON HERTLING,
89 Chancery Lane, London, W.C., Agents for the Applicant.
CAPITAINE & VON HERTLING,
89 Chancery Lane, London, W.C., Agents for the Applicant.