Improvements in Rotary Engines, Rotary Blowers, Pumps, and Water Meters.
Year: 1890

page_text: Date of Application, 2nd Aug., 1890
Complete Specification Left, 2nd May, 1891-Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Rotary Engines, Rotary Blowers, Pumps, and
Water Meters.
I, ROBERT JOHNSON, of 55, Athol Road, Bradford in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to that class of rotary engine, rotary blowers, pumps and
water meters in which a revolving cylinder mounted in a suitable casing is
employed and provided with projecting vanes or piston vanes which revolve in
contact with or in close proximity to said casing, and in which a cylindrical valve
is employed geared to revolve therewith having openings or recesses to allow said
vanes to pass. The object of the invention is to reduce the size and volume of said.
openings or recesses and also the relative time the periphery of said vane cylinder
is out of contact with the periphery of the cylindrical valve as the vanes are
passing the penings therein.
provements consist in driving the said cylindrical valve at a greater
than the vane cylinder and in modifying the form of the recesses or.
openings in th Je valve to allow of this increased speed.
The said
surface speed
To carry out my invention I preferably so gear the cylindrical valve and vane
cylinder together that the former revolves at approximately the same surface speed.
as the periphery or extremity of the vanes on the vane cylinder and I preferably.
so form the vanes and valve openings that the extremities of said vanes enter and
leave said openings at about the same point.
Dated this 1st day of August 1890.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Rotary Engines, Rotary Blowers, Pumps, and
Water Meters.
I, ROBERT JOHNSON, of 55, Athol Road, Bradford in the County of York,
Engineer, 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 that class of rotary engine, rotary blowers, pumps and
water meters in which a revolving cylinder mounted in a suitable casing is
employed and provided with projecting vanes or piston vanes which revolve in
contact with or in close proximity to said casing, and in which a cylindrical valve
is employed geared to revolve therewith having openings or recesses to allow said
vanes to pass. The object of the invention is to reduce the size and volume of
said openings or recesses and also the relative time the periphery of said vane
cylinder is out of contact with the periphery of the cylindrical valve as the vanes
are passing the openings therein.
The said improvements consist in driving the said cylindrical valve at a greater
surface speed than the vane cylinder and in modifying the form of the recesses or
openings in the valve to allow of this increased speed.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this Specification, in which similar letters of reference
indicate corresponding parts in each of the figures.

page_text: Figure 1, represents a cross section at right angles to the axes of the vane and
valve cylinders of a pump constructed in accordance with my invention, and
Figure 2, is a side elevation of the same.
The vane cylinder A and valve cylinder B are mounted in the bearings a, a
formed in the side plates C, C concentric with the semicircular ends D, D, of the
casing as usual in this class of mechanism and they are driven in the ordinary
manner by a pulley J mounted upon the shaft F of the vane cylinder A.
The diameter of the valve cylinder is equal to the full size of the vane cylinder
from the extremity of one vane to the other and their shafts E and F are geared
together by wheels G and H of equal size, consequently the valve cylinder being
of considerably larger diameter than the cylindrical portions of the vane cylinder
the surface speed of the former is proportionately greater. This increased speed
enables the valve openings e, to be reduced in width and also greatly reduces
the time the cylindrical portions of the valve and vane cylinders are not contact
with each other. The extremities of the vanes i, i pass into and leave the
openings e, e approximately at the centre as shown in Figure 1, and sad openings
are of such a shape that the vanes do not meet the sides of the openis until the
cylindrical portions of the valve and vane cylinders are on the point of
And the vanes pass from contact with the sides of the openings as th
cylindrical
portions again meet so as to avoid unnecessary friction and wear and t
By this method of construction the cylindrical portions of the vive and vane
cylinders are almost continuously in contact with the exception of the
omparatively
slight break as the vanes pass and as it is far less costly to prepare s
Cylindrical
faces to work accurately together without leaking and maintain than working
order the initial cost of this class of machinery is considerably red
effectiveness is not nearly so dependent upon the accuracy of the fo
openings or recesses so that better results are obtained generally.
separating.
d and the
f the valve
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 what I claim is:
In a rotary engine, blower, pump or water meter the combination with a vane
cylinder having projecting vanes of a valve cylinder geared thereto in such a
manner that the cylindrical portions of said valve cylinder revolve at a greater
surface speed than the cylindrical portions of said vane cylinder, substantially as
herein shown and described and for the purpose specified.
Dated this 1st day of May 1891.
DRACUP & NOWELL,
Bradford, Agents.