Improvements in Positive Pressure Blowers.
Year: 1893

page_text: Date of Application, 2nd May, 1893-Accepted, 2nd June, 1893
COMPLETE SPECIFICATION.
Improvements in Positive Pressure Blowers.
I, JOHN WRIGHT WILSON of No. 445, 13th Street in the City of Brooklyn
County of Kings and State of New York, United States of America, Machinist
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:
My invention relates to improvements in positive pressure blowers.
My invention consists essentially of wings pivoted in radial slots in the conic
side of a rotating piston working in a case having one side oblique to the plane of
rotation, and forming a cut-off abutment at one side and a way for receiving and
compressing the air on the opposite side of the axis of the piston, and it also
consists of certain details of construction and arrangement of the parts, all as
hereinafter fully described reference being made to the accompanying drawings
in which
Fig. 1, is a central sectional elevation in the plane of the shaft.
Fig. 2, is a central sectional elevation of my improved blower transversely to
the shaft, the wings being omitted.
Fig. 3, is a vertical section of part of the machine same as Fig. 1, but enlarged.
Fig. 4, is an elevation of one of the covers of the case.
Fig. 5, is a side elevation of one of the wing bearing rings on the same scale
as Fig. 3, in which said ring is shown in transverse section on line xx Fig. 5.
Fig. 6, is a detail of part of a wing and the wing bearing devices on
line y y, Fig. 5.
In this example of my invention I represent a duplex machine whereof the rim a,
of the case in which the wings 6 and the rotating piston c work, is faced obliquely
to the axis at both sides, and the piston is conic on both sides d, and carries wings b,
on each side making two compression ways as e, and two cutting-off abutments at f,
and this is the preferable form, but it is to be understood that single acting
machines utilizing one side only of the piston are alike available.
The rim a, has a cylindrical bored section f¹ the width of the face of the piston c,
or thereabout and it also has the oblique sections g, bored spherically to the axes
of the pivots h, respectively, and coincident with the bore of section" and it has
the clearance spaces i, with which inlet and outlet passages, communicate, and
which are separated by the abutment 1. The covers m consist of plain flat disks
bolted on the oblique sides of the rim close against the sides of the piston at one
side of its axis and form the aforesaid abutments f, and said covers close the ways e
at the opposite sides of the axis.
The piston is composed of two cup-shaped parts which are joined by the rims
abutted together at n, and it encloses a hollow space each conic side has a slot o,
extending across it diametrically in which the wings b, are fitted, said wings having
one straight edge p, to run in close proximity to the plane surface of the cover,
whilst the other edge projects into the hollow space of the piston. The wings
vibrate in these slots and thus project in the ways e, to take effect on the air and
retire to pass the abutments.
The two parts of the piston are secured together by the bolts a¹ dotted
in Fig. 1.
Each side of the slots there is an inwardly projecting flange e, integral with the
side plates of the piston to afford lateral support of the wings, and each side plate
has other flanges at right angles thereto the edges of which abut against the

page_text: edges of flange v, of the other plate for stability when the two parts of the piston
are secured together, the corners of the wings of one side of the hub play into the
spaces o between flanges o' of the other side.
7
The shafts & are made integral with the side plates d of the piston and are slotted
at b¹ for the wings: the flanges and merge in the shafts at the center, said
flanges also have branch flanges for greater stability.
To protect the edges p of the blades from wear against the covers I have
provided rings, in the annular recesses of the covers with removable wearing
rings, said rings being preferably fastened with screws c¹.
The rings z have recesses d' in which are boxes el in which the wings have step
bearings to prevent contact of the edges p with the sides of the case; packing
pieces are placed in the recesses under the boxes to gauge the edges of the wings
to the sides of the case.
The step bearings g' are preferably made of separate parts connected to the wings
by a stem and socket but they may be made integrally with the wings.
The rings are preferably made of two plates joined by the webs of the
recesses d', and by other webs as i¹ (dotted) at intervals around the ring, but they
may be solid if preferred. The rings z are caused to rotate by the wings through
the effect of the step bearings.
The covers m are bored centrally at * to receive the rings z, and these bores are
closed by other covers having oblique bores l' for the shafts, and being faced off
outside at right angles to the shaft for the application of boxes m' supported by
adjusting and centering screws n¹.
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 that what I
claim is:
1. The combination of the rotary piston having the diametrically slotted conic
side, the wings fitted in said slot and pivoted in the axis of the piston, and in the
apex of the cone, the case having the cylindrically bored section for the piston,
the spherically bored section for the wings, and the oblique side enclosing the
spherically bored section, and with the conic side of the piston forming an
abutment at one side of said axis of the piston substantially as described.
2. The combination of the rotary piston having the diametrically slotted conic
side, the wing fitted in the slot and pivoted in the axis of the piston and in the
apex of the cone, the case having the cylindrically bored section for the piston,
the spherically bored section for the wing, the oblique side enclosing the spherically
bored section, and the rotating bearing ring in the annular recess of the side of the
case substantially as described.
3. The combination of the rotary piston having the diametrically slotted conic
side, the wing fitted in the slot and pivoted in the axis of the piston and in the
apex of the cone, the case having the cylindrically bored section for the piston,
the spherically bored section for the wing, the oblique side enclosing the
spherically bored section, the rotating bearing ring in the annular recess in the
side of the case, and the step bearings of the wing in the ring substantially as
described.
4. The combination of the rotary piston having two diametrically slotted conic
sides, wings fitted in said slots and pivoted in the axis of the piston and in the
apexes of the cones, and the case having the cylindrically bored section for the
piston, two spherically bored sections for the wings, and two oblique sides enclosing
the spherically bored sections, and with the conic sides forming abutments at one
side of said axis of the piston substantially as described.
5. The combination of the hollow rotary piston consisting of two cup-shaped
parts fitted together at the edges and having two diametrically slotted sides with
the slots at right angles to each other or thereabout, wings fitted in said: slots aud
pivoted in the apexes of the cone, the case having the cylindrically bored section

page_text: for the piston, two spherically bored sections for the wings and two oblique sides
enclosing the spherically bored sections, and with conic sides of the piston forming
abutments at one side of the axis of the piston substantially as described.
Dated 2nd May 1893.
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicant.