Improvements in Rotary Pumps, Blowers, and Motors.
Year: 1888

page_text: PROVISIONAL SPECIFICATION.
Improvements in Rotary Pumps, Blowers, and Motors.
I, PERCY HADDAN, of the firm of Herbert & Co., Patent Agents, of 18 Buckingham
Street, Strand, W.C., London, in the County of Middlesex, Civil Engineer, do horeby
declare the nature of this invention, a communication to me from abroad by William
Briggs Allyn of Boston, in the County of Suffolk and State of Massachusetts, United
States of America, Manufacturer, to be as follows:-
This invention relates to rotary pumps, motors and blowers having an annular
piston with slot therein for passage of an abutment, and it principally concerns those
having central stationary flanges carrying the said abutment and an annular
eccentrically moved piston outside said cylinder.
The object of the improvements are, first to avoid undue friction heretofore caused
between the sliding abutment and the bearing surface of the slot receiving the same,
and secondly to obviate the necessity of forming an opening in the web of the piston
which is liable to become choked by sediment.
The invention consists of the combinations of parts, including their construction,
substantially as hereinafter fully set forth.
In carrying out the invention I construct the piston with a peripheral flange
arranged in alignment, and formed solidly with the web of the piston. Disposed in
the upper part of the casing are abutments arranged so as to cause their inner ends to
stand end wise closely to the said flange and web of the piston.
Upon the sides of the said flange opposite the slots in the piston is pivoted a link or
links connecting it with the casing in such a manner that while the piston will be
permitted to have the requisite movement the abutments will be prevented from
having contact with the surfaces of the slots in the piston. The addition of the flange
to the piston admits of the use of separate abutments, one arranged upon each side of
the flange and web thereof, while the use of the separate abutments renders unnecessary
the formation of an opening in the web of the piston in which such abutment heretoforo
worked. The flange extends entirely around the piston, and is of sufficient width to
prevent it leaving the circumferential recess in the casing thereby preventing the
water from passing back through the same.

page_text: The piston is actuated by a driving shaft having a rectangular portion or surface
upon which is fitted an eccentric. The eccentric works in a bearing or flange formed
with the web of the piston and which can be extended more or less as desired.
Between the shaft and the eccentric is interposed a spring which allows the piston to
pass over small obstructions liable to enter with the water.
In order to provide room or space for the said bearing or flanges and the eccentric,
recesses are furnished between the flanges which extend inwardly from the casing to
the web of the piston.
This pump may be provided with water chambers at the top, which would serve as a
convenience in the attachment of the inlet and outlet pipes.
Ports, four in number, may also be supplied to the casing, one being disposed upon
each side of each of the abutments and connecting by passages with the aforesaid
chambers.
As the pump can be reversed the ports on either side of the abutments can serve as
inlets or outlets.
If desired rectangular passages may be provided leading directly from the chambers
of the pump and connecting with the upper chamber.
Longitudinal wear may be taken up by interposing elastic packing between the
sections of the casing which will allow said sections to be drawn together more or less
and adjusted by means of bolts and set screws.
In operation it will be seen that when power is applied to the shaft and the piston is
actuated by the eccentric the links, while permitting the piston to have the required
movement, will prevent it from turning on the abutinents consequently from coming
into contact with the surface of the slots in the piston.
The improvements are applicable to blowers and motors constructed on the same
principle, and by placing two or more such engines on the same shaft, the moving
parts may be easily balanced, and steam be used expansively.
Dated this 25th day of July 1888.

page_text: I, PEROY HADDAN, of the firm of Herbert & Co., Patent Agents, of 18 Buckingham
Street, Strand, W.C., London, in the County of Middlesex, Civil Engineer, do hereby
declare the nature of this invention, a communication to me from abroad by William
Briggs Allyn of Boston, in the County of Suffolk, and State of Massachusetts,
United States of America, Manufacturer, 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 pumps, motors and blowers having an annular
piston with slot therein for passage of an abutment, and it principally concerns those
having central stationary flanges carrying the said abutment and an annular
eccentrically moved piston outside said cylinder.
Reference being had to the accompanying drawings in which Fig. 1 is a sectional
elevation of the invention on the line X-X of Fig. 2.
Figure 2 is also a sectional elevation of the same on the line Y-Y of Fig. 1.
Figure 3 is a detached perspective view of the piston and links.
Figure 4 is an interior view of one side of the casing, showing the ports and a
section at the top in which are shown chambers for attaching the inlet and outlet
pipes, and
Figure 5 is a sectional elevation of the invention showing the ports and an
arrangement of water passages and upper chambers.
Like letters refer to like parts in the several figures.
The object of the improvements are, first to avoid undue friction heretofore caused
between the sliding abutment and the bearing surface of the slot receiving the same,
and secondly to obviate the necessity of forming an opening in the web of the piston
which is liable to become choked by sediment.
The invention consists of the combinations of parts, including their construction,
substantially as hereinafter fully set forth and pointed out in the claims.
In carrying out the invention I construct the piston 9, g' with a peripheral flange H
arranged in alignment, and formed solidly, with the web G of the piston. Disposed
in the upper part of the casing are abutments J, J, arranged so as to cause their inner
ends to stand endwise closely to the said flange H and web G of the piston g, gl.
Upon the sides of the flange H opposite the slots in the piston g, g is pivoted a link
or links S, S¹ connecting it with the casing a in such a manner that while the piston
will be permitted to have the requisite movement the abutments J, J will be prevented
from having contact with the surfaces of the slots in the piston. The addition of the
flange H to the piston admits of the use of separate abutments, one arranged upon
each side of the flange and web thereof, while the use of the separate abutments
renders unnecessary the formation of an opening in the web G in which the abutment
heretofore worked. The fange H extends entirely around the piston, and is of
sufficient width to prevent leaving the circumferential recess I in the casing a
thereby preventing the water from passing back through the same.
The piston is actuated by a driving shaft B having a rectangular portion or surface
upon which is fitted an eccentric E. The eccentric works in a bearing or flange M M¹
formed with the web G and which can be extended more or less as desired. Between
the shaft B and the eccentric E is interposed a spring c which allows the piston to
pass over small obstructions liable to enter with the water.

page_text: In order to provide room or space for the bearing or flanges M M¹ and the
eccentric E recesses F F are furnished between the flanges Ď D' which extend
inwardly from the casing to the web G of the piston.
This pump may be provided with water chambers at the top, which would serve as a
convenience in the attachment of the inlet and outlet pipes.
Ports PP four in number may also be supplied to the casing a one being disposed
upon each side of each of the abutments JJ and connecting by passages with the
aforesaid chambers as shown in Figures 4 and 5.
As the pump can be reversed the ports on either side of the abutments can serve as
inlets or outlets.
If desired rectangular passages may be provided leading directly from the chambers
of the pump and connecting with the upper chamber as shown by dotted lines and
arrows in Figures 4 and 5.
Longitudinal wear may be taken up by interposing elastic packing between the
sections of the casing at n―n, Figure 4, which will allow said sections to be drawn
together more or less and adjusted by means of bolts and set screws.
In operation it will be seen that when power is applied to the shaft B and the piston
is actuated by the eccentric E, the links S, S¹, while permitting the piston to have the
required movement, will prevent it from turning on the abutments J J consequently
the latter from coming into contact with the surface of the slots in the piston.
The pump is applicable to blowers and motors constructed on the same principle,
and by placing two or more such engines on the same shaft, the moving parts may be
easily balanced, and steam be used expansively.
I do not claim the eccentric-actuated piston, without the peripheral flange, and with
an abutment extending through an opening in its web or with any passages through it
for water, as these have been before used, but
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a pump, the combination, with a casing having the circumferential recess and
inwardly projecting flanges, of the piston having the peripheral flange arranged coin-
cidently with and entering said recess, links connecting the flange with the casing and
abutments, substantially as set forth.
2. In a pump, the combination, with a casing having the circumferential recess and
inwardly projecting flanges, of the piston having the peripheral flange arranged
coincidently with, and entering said recess, links connecting the flange with the
casing and abutments disposed end wise and closely to the sides of said flange,
substantially as set forth.
3. In a pump the combination with a casing having the circumferential recess, and
inwardly projecting flanges of the piston, having the bearing or flanges, and the
peripheral flange, the abutments disposed endwise, and closely to the side of said
peripheral flange of the piston, the shaft fitted with a spring-cushioned eccentric,
interposed between the shaft and the said bearing, and the links connecting the
piston-flange with the casing, substantially as set forth.
Dated this 14th day of September 1888