Improvements in Rotary Engines.
Year: 1891

page_text: Date of Application, 31st Mar., 1891-Accepted, 9th May, 1891
COMPLETE SPECIFICATION.
Improvements in Rotary Engines.
I, GEORGE HENRY WESTON, Mechanic, of 84 Kingston Street, in the City of
Boston in the State of Massachusetts one of the United States of America 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 rotary engines and has for its object to improve the
construction of the same, whereby the valve may be opened at an earlier period of
its stroke and reference is made to the Specification of Letters Patent granted to
me dated April 29th 1890 No. 6509.
In accordance with my invention, the piston valve at its port opening is provided
with a longitudinal arm to enter a longitudinal groove or recess in the abutment,
whereby the space between the abutment and piston valve is made steam tight,
thereby enabling the valve to be opened at an earlier period of its stroke or
revolution.
The particular features of my invention will be pointed out in the claim at the end
of this Specification.
Fig. 1, is a transverse section of a rotary engine embodying my invention, the
section being supposed to be taken on line, Fig. 2.
Fig. 2, a section of the engine shown in Fig. 1 on the line ¹, a¹.
Fig. 3, a detail to be referred to, and
Fig. 4, a detail of the form of gearing preferred by me.
The cylindrical case A provided with the bearings a, a', the bearing a being
extended into the said case, and having mounted upon it the abutment a² located
within the case A, the cover a³ secured to the said case, are and may be substantially
such as shown and described in the Patent referred to.
The abutment a², herein shown as detachably secured as by screw a to the
shaft a, is provided in accordance with my invention with a longitudinal or axial
groove, channel or recess a', see Figs. 1 and 3.
The shaft a, as herein shown, is extended through the bearing sleeve a³ made
conical at its inner end, as at a³.
The shaft as is coupled, as shown, by gears a10, a to the shaft as to which is
secured as by screw as the piston valve a preferably provided at its front end with
the projecting portion as and at its rear end with the Hange a..
The piston valve a" is provided with a longitudinal slot or port opening b, see
Figs. 1 and 3, and one wall of the said slot is provided with an extended lip, which
projects into the groove a' and fits therein steam tight, the said lip extending the
length of the said groove or channel.
The piston valve is provided with the arm which enters the reentrant
portion 61 of the abutment, the said arm being made separate from the piston valve
suitable manner, as by a screw or bolt 61°.
and secured thereto in separate from the piston valve, I am enabled to employ
By making the arm
lighter metal, such as aluminium.
The hollow piston valve a has cooperating with it the cut-off 65, provided
with the stem or rod extended out through the cover a³, as in the Patent
referred to.
By means of the lip 61 entering the groove a' and fitting steam tight therein, the
piston valve may be made to open earlier, as the said lip prevents the escape of live
steam into the exhaust port b³.
Referring to Fig. 2, the lip on the piston valve is shown in contact with one
edge, as 2, of the groove or channel a', and the port opering or space between the

page_text: abutment and the piston valve from the point 3 to the said lip is rendered steam
tight, so that the steam inlet port of the valve may be opened earlier than if the
lip was omitted.
Referring to Fig. 4, I have shown the form of gears a, a preferred by me, the
gear a being provided with teeth having a flat face, as 20 in a radial line with
the center of the gear, the said face preferably having fitted into it a buffer 30 of
leather or like material.
The gear
is provided with teeth aª having one side or face, as 4, made curved
so that the point of contact of the teeth, a is in a direct line with the centers 7,8
of the gears.
By making the arm of aluminium, the piston valve is not thrown so far out of
balance, and consequently does not have to be provided with as much counter-
balancing metal as would be the case, if the said arm is made of steel or other
heavier metal.
The joints between the various parts of the engine are rendered steam tight by
suitable packing material d.
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. In a rotary engine, an enclosing case provided with a bearing, an abutment
having reentrant portion and a groove or channel on its periphery extended
axially, a shaft for said abutment, a piston valve provided with an arm to enter said
reentrant portion and with a lip to enter said groove or channel, and a shaft for
said piston valve substantially as described.
2. In a rotary engine, an enclosing case provided with a bearing, an abutment having
a reentrant portion, and a groove or channel a' on its periphery extended axially, a
shaft for said abutment, a gear a on said shaft, a hollow piston valve provided
with an arm to enter said reentrant portion, and with a lip to enter said groove
.or channel, a shaft for said piston valve, and a gear a on said shaft in mesh with
the gear a", the point of contact of the teeth of said gears being in a direct line
with the centers of the gears, substantially as described.
3. In a rotary engine, an enclosing case provided with a bearing, an abutment
having a reentrant portion, a shaft for said abutment, a screw or threaded rod
extended through the face of the abutment into the end of the shaft a piston valve
provided with an arm to enter said reentrant portion, a shaft for said piston valve,
and a screw or threaded rod extended through the piston valve into the end of the
shaft to secure the valve to its shaft, substantially as described.
4. In a rotary engine, an enclosing case provided with a bearing, and abutment
having a reentrant portion, a shaft to which said abutment is secured, a piston valve
provided with an arm to enter said reentrant portion, a shaft for said piston valve,
and means extended through the piston valve into the end of the shaft to secure the
valve to its shaft, substantially as described.
Dated the 31st day of March 1891.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.