all of Kensal Green in the County ofsex Engineers IN ROTARY ENGINES AND PUMPS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by John Brierley, Frederick Wade
Brierley and Walter Wright Brierley at the Office of the Commissioners of
Patents on the 10th July 1882.
JOHN BRIERLEY, FREDERICK WADE BRIERLEY and WALTER WRIGHT BRIERLEY,
"IMPROVEMENTS
all of Kensal Green in the County of Middlesex Engineers
IN ROTARY ENGINES AND PUMPS."
The improvements which form the subject of the present application have for
their object to render the working of rotary engines more even and quiet than
heretofore when working at high speeds.
In carrying out our invention we use that kind of piston which consists of a
small cylinder set excentrically inside the steam cylinder and having a blade
working across its diameter. In this form of piston the edges of the blade have to
be bevelled off to permit of its working and thus the rubbing or wearing surface
is so narrow that it is almost impossible to keep the piston steam tight besides
which the rubbing surface rapidly wears away causing considerable expense for
renewals from time to time.
•
Attempts have been made to remedy these defects by employing a series of
blades so set that a broad rubbing surface may be obtained the said blades being
projected from the inner cylinder by cams or equivalent mechanical incans.
These arrangements are however complicated and have not been found to work
when the engine is running at a high speed.
•
Now according to our invention we divide the blade transversely into two
parts the depth of each part being somewhat less than half the diameter of the
steam cylinder so that when the blades are in position there will be a small
space between them. In the outer edges of these blades we form a semi circular
recess in which works a metal packing piece. One face. of this packing piece is
made to correspond to the recess in the blade and the other face is rounded to
correspond to the circumference of the steam cylinder. The inner edges of the
blades are also recessed to form a steam space to which steam is introduced in any
convenient manner to act as a spring to force the blades outwards against the
packing pieces. The width of the blades may vary according to the size of the
engine and as the packing pieces may be of nearly the same width it will be
evident that a more or less broad rubbing surface will be obtained.

page_text: Instead of two wide blades we may employ four narrower blades the outer
edges of which will be recessed to receive the packing pieces and the inner ends
to form the steam spring space.
If desired metal springs may be employed in lieu of the steam spring. The
steam valve which we employ consists of a cylinder enclosing the steam cylinder,
and containing suitable passages connecting the inlet and exit ports in the steam
cylinder with the steam chest and exhaust pipe.
To open or close the ports the valve cylinder is rocked by a crank arm in
connection therewith and mounted on a suitable rod or spindle.
This valve when once set remains stationary and it can be set to admit any
quantity of steam required.
It will of course be understood that an engine as above described may be driven
by water or any other suitable motive force and that the principle of construction
is equally applicable to rotary pumps.