A NEW OR IMPROVED ROTARY ENGINE, APPLICABLE ALSO FOR USE AS A LIQUID METER AND AS A PUMP
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Cyrus Avery at the Office of the
Commissioners of Patents on the 1st February 1877
CYRUS AVERY, of Islington, in the County of Middlesex, Engineer " A NEW OR
IMPROVED ROTARY ENGINE, APPLICABLE ALSO FOR USE AS A LIQUID METER AND AS
A PUMP."
This Invention relates to a new or improved rotary engine, applicable also for use
as a liquid meter and as a pump
According to my Invention the piston of the rotary engine is attached to a disc
and works in a groove or channel concontiic with the axis of the disc
The piston
may be of cucular or other approved form, and inay be provided with a ring o
other packing The disc also works steain-tight between the opposite sides of the
case oi dium (forming the body of the engine) and runs also on a roller contained
within the said case and of about the same diameter as the disc, but sufficiently
wide that a pocket or recess may be formed in it to receive the piston as it is
brought round by the revolution of the disc The said roller where it intercepts
the channel in which the piston works, closes the said channel and forms an abut-
ment for the steam, which issues into the said channel between the said abutment
and the piston, consequently forcing the latter round until near the end of the
channel where the exhaust aperture is formed, after passing which the piston enters
the pocket in the roller, and immediately this pocket by reason of the rolle
revolving has passed the intersection of the sud channel by the said roller, the
steam is again let in between it and the piston
The steam is admitted through apertures in the face of the casing covered by a
valve, said apertures communicating with a channel in the disc leading to the
piston at one side of which the steam is ejected By adjustment of the valve the
steam may be cut off at any portion of the stroke
The relative positions of the disc and roller are maintained by spur wheels on
their respective shafts gearing into one another, which spur wheels inay be either
outside the case of the engine or within the exhaust chamber
One side of the case of the engine is removable and forms a cover, and the
channel in which the piston works is formed half within the cover and half within
the stationary portion.

page_text: To ensure the side faces of the disc being steam-tight packing rings may
be introduced between it and the sides of the case; or other packing may be
employed
For making the engine reversible two steam valves must be used instead of one
only, the second valve communicating with a second channel in the disc lending to
the opposite side of the piston Two exhaust apertures must also be provided, one
on each side of the line of contact of the disc and roller, one of which, as required,
is kept closed by a valve operated by a lever leading to the outside of the engine
Two discs and pistons may, if desired, gear into the roller on the opposite sides
thereof, the pistons being arranged in relation to one another and to the roller 60
that they will alternately enter the pocket of the latter The engine thus formed
may be driven by steam or other Huid When driven by a liquid it will also
measure the flow thereof, diven by another engine it may be used as a pump.