Improvements in Rotary Blowers, Exhausters, or Pumps.
Year: 1895

page_text: Date of Application, 30th Jan., 1895-Accepted, 30th Mar., 1895
I
COMPLETE SPECIFICATION.
Improvements in Rotary Blowers, Exhausters, or Pumps.
THOMAS WILBRAHAM GREEN, Factory Superintendent residing at
No. 2007 East Alleghany Avenue in the City of Philadelphia, State of
Pennsylvania United States of America 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 rotary blast blowers or exhausters for forcing or
exhausting air, water and similar fluids, and the improvements consist in the
particular construction and arrangement of those parts of the revolvers or pistons,
that are located between the wings or blades and form the locks or cut off's to
prevent the escape and backward flow of the fluid acted upon. The general con-
struction and operation of the driving parts of my improved blower are the same
as ordinarily used in this class of machines, and is particularly described in the
Complete Specification of my application numbered 7139 of 1894.
In the accompanying drawing
Figure 1, is a vertical cross sectional view through a blower constructed with my
improvements therein.
Figure 2, is a horizontal sectional view of the blower on line a, x, of Figure 1.
Figure 3, is a vertical cross sectional view of a blower having the locking or
cut off mechanism arranged in the same manner as those parts shown in Figure 1,
but with flat wings or blades formed separately.
Figure 4, is a vertical cross sectional view of a blower having the locks. or
cut offs arranged slightly different from those shown in Figures 1, 2, and 3, but
otherwise constructed on the same principle.
Where not otherwise specified similar letters refer to similar parts throughout
the several views.
In the description immediately following, and which has particular reference to
Figures 1 and 2, A, represents the bed plate of the machine; B, B, are the end
castings forming the supports for the driving shafts; C, is the external casing
surrounding the revolvers or pistons; A¹, is the intake for the air or water; B¹, is
the outlet or discharge port; D, D, are the driving shafts; E, E, are two
revolvers secured upon the respective driving shafts D, D; F, F, are solid heads
on the ends of the revolvers. These heads together with the shafts D, D, are
preferably cast integral with the other parts of the revolvers. By thus casting all
parts of the revolvers in one piece, the central or middle parts lying between the
wings, may be made quite thin one way, thus allowing the outer ends of the wings
of one revolver to extend further into the gaps or pockets on the opposite revolver
as they pass each other. F', F¹, are the pulleys over which the driving belt
passes, G, G, are gear wheels secured on the driving shafts to preserve a positively
uniform motion of the revolvers, b, b, b, b, are four short segmental extensions
formed on each of the revolvers E, E, the outer surfaces of these segmental
extensions are segments of a circle, the center of which is the center of the
respective driving shafts, the diameters of said circles being the distance between
the centers of the driving shafts D, D; c, c, c, c, are four larger segmental
extensions formed on each of the revolvers E, E, the center of each pair of these
long segmental extensions c, is the same, the said center being located on the
circumference of the circle forming the short extensions b, b; a, a, are intervening
webs joining the long extensions c, c, in pairs.

page_text: These intervening webs are not necessarily segments of circles, they may be
formed on straight lines, if desired but it is best to give them a circular formation,
making them as large as will pass through the gaps formed in the opposite revolver.
When the segmental extensions b; b, and c, c, are formed to circles of correct
diameters, the forward end of one of the short extensions b, on one revolver will
engage with the outer surface of one of the long extensions e, on the opposite
revolver, following it around until the two short extensions b, b, meet when these
two, short extensions begin to separate, as the revolvers turn around, the rear end
of one of the short extensions b, will engage with the surface of the long extension e,
immediately following on the other revolver, thus maintaining a complete lock or
cut off until the other similar parts of the two revolvers co-operate for the same
purpose, and prevent the backward flow of the fluid. The wings of the revolvers
or pistons shown in Figure 1, are formed by the webs a, a, joining together the
ends of the long extensions c, c.
When the revolvers are constructed and arranged
in the blower in the manner shown in Figure 1, the gaps or spaces between the
wings of one revolver are almost completely filled by the wings of the opposite
revolver, as the said revolvers turn around, consequently the air contained in said
gaps is displaced before the locking parts b, and c, begin to operate and there is no
air remaining in said gaps to be compressed therein and afterwards discharged
against the air coming in at the intake and thus cause a thump or noise when the
blower is in operation.
In Figure 3, of the drawing the revolvers E', E', are formed with flat blades or
wings a', a', separate from the long extensions c, c, there being no intervening webs
that join the said long extensions c, c, together in pairs; the locking or cut off
mechanism however is the same as that hereinbefore described and shown in
Figures 1 and 2.
In the form of revolvers or pistons shown in Figure 4, both of the revolvers or
pistons are formed with the flat blades or wings a¹, al, and both have thereon the
four short segmental extensions b, b, but the long segmental extensions c, c, shown
in Figures 1, and 3, are only on the one revolver E3, this revolver is also provided
with additional long segmental extensions c¹. To preserve the lock or cut off, when
using these forms of revolvers or pistons, the forward end of the short extensions b,
on the revolver E2, will engage with the outer surface of the long extensions c, on
the revolver E³, and as the revolvers turn around the rear end of the short
extensions b, on the revolver E³, will engage with the outer surface of the long
extensions c¹, on the revolver E³, thus at all times preserving a complete lock or
cut off.
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. In a rotary blower exhauster or pump, the combination of two revolvers
surrounded by an outer casing, each revolver having formed thereon the short
segmental extensions, and the long segmental extensions c, said long segmental
extensions c, on each revolver, converging in the direction of the parts forming the
wings and adapted to engage with the ends of the short extensions b, on the opposite
revolver to form locks or cut offs, substantially as shown.
2. In a rotary blower exhauster or pump, the combination of the two revolvers E, E,
each of said revolvers being provided with a series of short segmental extensions b,
and a series of long segmental extensions c, the long segmental extensions c, on each
revolver being joined together in pairs by the webs a, and adapted to co-operate
with the short extensions b, on the opposite revolver to form locks or cuts off,
substantially as shown and for the purpose described.
3. In a rotary blower exhauster or pump, the combination of the two revolvers
surrounded by an outer casing, each of said revolvers having cast integral therewith
the solid heads F, F, provided with the short segmental extensions, and the long
segmental extensions c, said long segmental extensions c, converging in the direction

page_text: of the part forming the wings and adapted to engage with the ends of the short
segmental extensions b, and co-operate therewith to form locks or cut offs,
substantially as and for the purpose described.
4. In a rotary blower exhauster or pump, the combination of two revolvers
surrounded by an outer casing, each of said revolvers being provided with two flat
wings or blades and between said wings or blades, having the short segmental
extensions b, and the long segmental extensions c, the long extension c, converging
in the direction of the wings or blades and adapted to engage with the short
extensions b, on the opposite revolver to form locks or cut offs, substantially as
shown and described.
5. In a rotary blower exhauster or pump, the revolver E2, having the flat blades
or wings a', and between the said wings or blades the short segmental extensions b,
in combination with the revolver E³, having the flat blades or wings a', and between
the said wings or blades the short segmental extensions b, and the long segmental
extensions ce and c', the ends of the short segmental sections b, on the revolver E?,
being adapted to engage with the outer surfaces of the long extensions c and c¹, on
the revolvers E3; both of the said revolvers being mounted in a suitable frame and
working together substantially as and for the purpose described.
Dated the 30th day of January 1895.
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicant.
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicant.