Improvements in Rotary Air-engines.
Year: 1891

page_text: Date of Application, 27th Apr., 1891
Complete Specification Left, 18th Jan., 1892-Accepted, 12th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Rotary Air-engines.
1, REGINALD HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street, Strand, W.C. in the County of London, Civil Engineer
do hereby declare the nature of this invention a communication to me from
abroad by Hermann Müller of Leipzig in Germany, Manufacturer to be as
follows:-
This invention consists in an improved rotary engine intended to be driven by the
motive force of the expansion of compressed air.
A cylindrical stationary casing fixed or forming part of the stand or bed plate
of the engine is surrounding by a rotary cylindrical hood, the outer face of which
is curved or otherwise formed to driving a machine belt or equivalent gearing.
This hood is carried by a disc or wheel upon a central shaft traversing the axis of
the engine and is provided on its inner side with three parallel circular webs
meeting exactly the outer surface of the inner stationary cylindrical casing, so as
to enclose two annular parallel spaces. Each of these spaces is divided into two
semi-annular halves by two diaphragms or heads, those in the one space being
preferably placed intermediately with regard to those in the other space.
On the rotary shaft is keyed a cam disc operating upon the ends of four radially
movable pistons, the said cam disc being adapted to hold said pistons protruded into
the annular spaces except when the fixed diaphragms or heads pass above the
pistons when the latter are temporarily withdrawn by depressions in the cams.
Channels are made in the body of the casing, leading to an air pressure chamber
in which is a rotary disc fixed upon the aforesaid shaft and provided with slots so
arranged with regard to the air channels that compressed air is admitted during a
quarter revolution, then cut off and suffered to act by expansion during the
succeeding quarter revolution after which it passes to the exhaust; and the cycle
of action is such in the four semi-annular spaces that during the whole revolution
compressed air is admitted consecutively to all the four chambers each being
placed in communication with the air chamber during a full quarter revolution.
In place of providing a cam disc or discs to operate the movable piston heads
the faces of the latter may be bevelled and also the faces of the fixed diaphragms
or heads so that the latter in their passage depress the movable piston heads which
are in such case provided with springs for protruding them.
Dated this 27th day of April 1891.
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in Rotary Air-engines.
I REGINALD HADDAN of the firm of Herbert & Co. Patent Agents of
18 Buckingham Street Strand W.C. London, Civil Engineer do hereby declare
the nature of this invention a communication to me from abroad by Hermann
Müller of Leipzig in Germany, Manufacturer and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement :—
This invention consists in an improved rotary engine intended to be driven by the
motive force of the expansion of compressed air.
A cylindrical stationary casing fixed or forming part of the stand or bedplate

page_text: disc valve e with slots ƒ ƒ g g arranged in relation to said channels substantially as
set forth.
4. The combination as set forth of the core or case a with its channels c c d d
the disk valve e with slots f f g g and the annular chest 6 supplied with the motive
fluid.
5. In the motor herein described the combination with the pistons i ikk of the
cam disc h on the shaft w substantially as set forth.
6. In the motor herein described the combination with the pistons i ork of the
bevelled heads 7. 8 and springs i substantially as set forth.
Dated this 18th day of January 1892.
HERBERT & Co.,
Agents to Applicant.