IMPROVEMENTS IN ROTARY ENGINES AND PUMPS
Year: 1869

page_text: PROVISIONAL SPECIFICATION left by John Loader at the Office of
the Commissioners of Patents, with his Petition, on the 6th
March 1869.
I, JOHN LOADER, of Upper Clifton Street, Worship Square, in the
County of Middlesex, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN ROTARY ENGINES AND PUMPS," to be as
follows:-
The Invention has for its object improvements in rotary engines
and pumps. For this purpose I employ a disc or piston having an
epicycloidal movement within a cylinder in connection with a radial
or other stop or abutment.
The engine is constructed as follows:-Through a cylinder I place a
central shaft or axis having a crank pin or eccentric formed on or carried
thereby, and upon the crank pin or eccentric I fit a disc which is capable
of revolving thereon and the periphery of which fits against the inside
of the cylinder. In the cylinder I cut a slot, in which a stop or abut-
ment slides; this stop or abutment may be in a line radiating from the
centre of the cylinder or inclined thereto, and such stop or abutment is
conn cted to the disc or piston by a stud or pin which is received into a

page_text: suitable hole formed for it in the disc or piston, or it may be connected
thereto in other convenient manner, or if desired the stop or abutment
may be disconnected from the disc or piston but forced up thereto in any
suitable or well known manner. The steam or other motive fluid enters
at one side of the stop or abutment and acts against the periphery of the
disc or piston, which is thereby made to rotate on the crank pin or
eccentric and around the central axis. The exhaust port is at the other
side of the stop or abutment near to the inlet port.
In the arrangement before described the cylinder is supposed to be
fixed, whilst the piston revolves around the central shaft or axis, but in
some cases I reverse the the action of the parts and cause the cylinder to
revolve around the piston, the central shaft being fixed. If desired to
work expansively any suitable "cut-off" may be employed, but that
which I prefer for the last-described arrangement is as follows:-I form
a suitable groove or steam passage in the axis of the cylinder, which in
the rotation of the cylinder comes at the desired times opposite a passage
formed in or carried by the standard or framing so as to open a com-
munication with the steam boiler, and in order to render the "cut-off"
capable of regulation I employ a worm and worm wheel or their
equivalents, so as to facilitate the throwing of the disc or piston more or
less round with its shaft or axis and thereby open the communication
between the boiler and engine earlier or later as desired. The disc or
piston may have any suitable packing applied thereto, but I prefer to
apply around its edge a number of elastic packings which are received
into suitable undercut recesses formed across the periphery of the disc or
piston, whilst I pack the side of the disc or piston by means of a cut
ring, which is received into a suitable inclined groove or recess formed
around the side of the disc or piston near the edge thereof. In order to
enable the engine to be reversed when desired I employ two sets of inlets
and outlets, and by means of suitable cocks or valves cut off the one or
the other set of inlet and outlet passages as desired.
The Invention above described with slight modifications may also be
emploved as a rotary pump.