Improvements in Rotary Blowers or Exhausters.
Year: 1896

page_text: Date of Application, 6th May, 1896-Accepted, 18th July, 1896
COMPLETE SPECIFICATION.
Improvements in Rotary Blowers or Exhausters.
I, THOMAS WILBRAHAM GREEN, Factory Superintendent, residing at
No. 2007 East Alleghany Avenue, in the City of Philadelphia, State of Penn-
sylvania, 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 blowers or exhausters for forcing or exhausting
air, water and other fluids, and the improvement consists in the construction and
arrangement of those parts of the revolvers or pistons that form the locks or
cut-offs to prevent the backward flow of the fluid acted upon. The general con-
struction and operation of blowers of this class is particularly described in the
Specifications to Patents heretofore granted to me, one of said Patents being
numbered 7139 and dated April 10th 1894, and the other numbered 2111 and
dated January 30th 1895.
In the construction shown in both of these each revolver or piston has formed
thereon four short segmental extensions marked b, b, b, b, that meet and roll around
together, those on one revolver just touching the corresponding parts on the
opposite revolver. This construction is all that can be desired when blowing or
exhausting air or water, but when the blower is used on tar or other fluids of a
like nature, I have found that the tar or other material will adhere to the outer
surfaces of these short segmental extensions and in a short time form a hard and
compact layer or coating thereon, consequently when said segmental extensions
meet each other as the revolvers turn around, the driving shaft must bend to
accommodate themselves to the extra thickness formed on the outer surfaces of
these parts of the revolvers.
My present invention is to overcome this difficulty and construct the revolvers
or pistons in such a manner that, whilst the lock or cut off is maintained, the
locking surface of one revolver will be scraped or cleaned off by the opposite
revolver when the blower is in operation and there will be no segmental extensions
or parts that meet each other and roll around together. I accomplish the desired
result by leaving off the short extensions b, b, b, b, shown in my previous specifi-
cations and constructing the locking or cut off parts so that the inner ends of the
locking parts on one revolver will pass over the outer surfaces of the similar
parts on the opposite revolver and thus free them from any material adhering
thereon.
In the accompanying drawing
Figure 1, is a vertical cross sectional view through a blower having my improvel
form of revolvers ;
Figure 2, is a horizontal sectional view of a blower with the top of the outer
casing removed;
Figure 3, is a vertical cross sectional view, showing a form of revolvers similar
to those shown in Figure 1, but having the parts forming the cut off's flattened
instead of angular.

page_text: A, represents the bed plate of the machine; B, is the end casing forming the
support for the driving shafts; C, is the external casing; A', is the outlet or
discharge; B', the intake; E, E, are the revolvers, each of which consists of two
enlarged portions joined together by a thin neck or strip and provided with suit-
able driving shafts on the ends that project through the outer casing; E', E', are
solid heads, one at each end of each revolver and cast integral therewith; the
driving shafts D, are also preferably, cast on these parts and turned down to the
required size; a, a, are the parts forming the wings or blades of the revolvers ;
b, b, b, b, are four long segmental extensions formed on each revolver; c, c, c, c, are
four angles or corners on the rear of inner end of each of the long segmental
extensions b. When the blowers are not designed to work under a high
pressure, these corners or angles c, on one revolver, passing over the surfaces of the
long segmental extensions b, on the opposite revolver are sufficient to maintain the
lock, but when the blower is designed to work under a high pressure, the four flat
surfaces c, c, c, c', shown in Figure 3, are formed on the long segmental
extensions ; these flat surfaces make a longer contact of the locking or cut off
parts of the revolvers, consequently a more secure lock.
If desired the revolvers may be constructed with flat wings or blades in place of
the curved form made by the parts a, a, joining two of the segmental extensions b,
together.
When the revolvers are constructed as shown and the segmental extensions b,
are formed to the proper curve, the rear or inner ends of one segmental extension b,
will follow along on the outer surface of one of the segmental extensions b, on the
opposite revolver, until the next following similar parts of each revolver come
into play, thus at all times preserving a lock or cut off and cleaning off any of the
material that may adhere.
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 rotary blower or exhauster the combination of two revolvers mounted
in a suitable frame and surrounded by an outer casing, each of said revolvers having
thereon the four long segmental extensions b, said extensions converging in the
direction of the parts forming the wings or blades of the revolvers, and formed to
such a curve that the rear end of one of the said extensions b, on one revolver will
scrape or slide along over the outer surface of one of the extensions b, on the
opposite revolver and form a lock or cut off, substantially as showu and described.
2. In a rotary blower or exhauster the combination of two revolvers E, E, each
of said revolvers having formed thereon the four long segmental extensions b,
converging in the direction of the parts forming the wings, and a series of flattened
sections c, located at the rear or inner end of the segmental extensions b, the
said flattened sections c', being adapted to scrape or slide along over the outer
surfaces of the segmental extensions b, for the purpose of forming a lock or
cut off as set forth.
3. In a rotary blower or exhauster the combination of the two revolvers E, E,
each of said revolvers having cast integral therewith, the solid heads E, E, and
having thereon the four segmental extensions b, converging in the direction of the
parts forming the wings and formed to a curve that will allow the rear or inner
ends of the said extensions b, on one revolver to scrape or slide along over the
outer surfaces of the said extensions b, on the opposite revolver, substantially as
and for the purpose described.
4. In a rotary blower the combination of the two revolvers E, E, the two parts
of each of said revolvers being joined together by a thin strip or neck that forms
no part of the locking device, and provided with segmental extensions b, b, con
verging towards the parts forming the wings, the outer finished surfaces of the
said extensions b, b, on ench revolver being adapted to engage with the inner or

page_text: rear ends of the said extensions on the opposite revolvers and being of sufficient
length to enable a lock or cut-off to be continuously maintained by the co-
operation of these parts as the revolvers turn around, substantially as described.
Dated the 6th day of May 1896.
PHILIP M. JUSTICE,
55 & 56 Chancery Lane, London, Chartered Patent Agent,
For the Applicant.