IMPROVEMENTS IN THE MANUFACTURE PROVISIONAL SPFICATION
Year: 1883

page_text: LETTERS PATENT to William Allday the younger and Edmund Allday trading
as William Allday and Sons of Birmingham in the County of Warwick
Manufacturers for an Invention of "IMPROVEMENTS IN THE MANUFACTURE
PROVISIONAL SPECIFICATION left by the said William Allday the younger
and Edmund Allday at the Office of the Commissioners of Patents on the
29th December 1883.
WILLIAM ALLDAY the younger and EDMUND ALLDAY trading as William Allday
and Sons of Birmingham in the County of Warwick Manufacturers " IMPROVE⭑
MENTS IN THE MANUFACTURE OF ROTARY BLOWERS EXHAUSTERS AND PUMPS'
"
Our invention has reference to rotary blowers of the kind commonly known as
Root's blowers and to similar blowers employed for producing a blast of air for
urging the fires of forges and other fires the said blowers being also exhausters
and when driven at a slow speed may be used as pumps for raising and forcing
liquids.
We will describe our invention in connection with a blower for producing a blast
of air.
A blower of the kind described consists essentially of a case nearly oval in cross
section containing two rotating diaphragms having in cross section a figure
resembling generally the numeral 8 or an hour glass. These rotating diaphragms
are commonly called revolvers by which name we will herein after refer to them.
By the rotation of the said revolvers in opposite directions a current of air is drawn
in at an opening on one side of the case and forced out at an opening on the
opposite side of the case. The general construction and action of the said blower
is so well understood that we do not think it necessary further to refer to
the same.
Our invention has reference to the manufacture of the said revolvers whereby
great lightness is secured with the consequent saving of the driving power.
Revolvers made according to our invention are less liable to derangement by wear
and accident than revolvers of the ordinary kind.

page_text: •
In making one of the said revolvers according to our invention we form a
skeleton or frame consisting of end and middle or intermediate plates made
preferably in two parts or halves and fixed on the shaft of the revolver at right
angles the said frame having in outline the figure of the revolver to be made.
We cover the said frame with sheet iron or other hard sheet metal or alloy
which we attach to the frame by rivetting or otherwise. We thus produce a
revolver of extreme lightness. When it is desired to give additional rigidity to the
revolver we cover the skeleton or frame with plates of sheet iron of the required
curvature and having at those junctions which are at right angles to the shaft
internal flanges. When these internal flanges are rivetted together each compound
flange constitutes as it were an additional internal support to the sheet iron
The end and intermediate plates constituting the
covering of the revolver.
skeleton or frame of the revolver may be made by casting or forging or the said
frame may be made from semi cylindrical bar iron bent into the required shape.
Or each end and intermediate plate of the frame may be made from two bars of
semi cylindrical iron their flat faces being rivetted together at their middle portions
and their unrivetted ends being curved into the required figure. The said bars
may either pass through the shaft of the revolver or may be curved at their
middle so as to clip or pass round the boss of the shaft.
When the skeleton or frame is made in the last described ways or in analogous
ways the curved ends of the revolvers may be coated or covered with sheet iron or
other sheet metal in the manner herein before described. The sheet metal does not
in this case extend to the middle portions of the revolver but a middle diaphragm
or division extends from end to end of the revolver for the purpose of isolating one
side of it from the other.
We make the said diaphragm or division of a plate or plates of sheet iron or
other hard metal extending from end to end of the revolver dividing the said
revolver into two halves or divisions.
In open sided revolvers that is revolvers of the last described kind the boss of
the shaft requires to have such a diameter that the curved end of the revolver
shall work practically air tight against it and in order to give the said boss the
required diameter without unduly increasing its weight we make the said boss
hollow or tubular and fit it concentrically on the solid shaft by means of conical
ferrules driven between the shaft and the tubular boss and fixed in their places by
rivetting or otherwise.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Allday the younger and Edmund Allday in the Patent
Office on the 25th June 1884.
WILLIAM ALLDAY the younger and EDMUND ALLDAY, trading as William Allday
and Sons of Birmingham in the County of Warwick, Manufacturers IMPROVE-
MENTS IN THE MANUFACTURE OF ROTARY BLOWERS, EXHAUSTERS AND PUMPS.
Our invention has reference to rotary blowers of the kind commonly known as
Root's blowers and to similar blowers employed for producing a blast of air for
urging the fires of forges and other fires, the said blowers being also exhausters
and when driven at a slow speed may be used as pumps for raising and forcing
liquids.
We will describe our invention in connection with a blower for producing a blast
of air.
A blower of the kind described consists essentially of a case nearly oval in
cross section containing two rotating diaphragms having in cross section a figure
resembling generally the numerical 8 or an hour glass. These rotating diaphragms
are commonly called revolvers by which name we will herein after refer to them.
By the rotation of the said revolvers in opposite directions a current of air is drawn
in at an opening on one side of the case and forced out at an opening on the
opposite side of the case. The general construction and action of the said blowers
is so well understood that we do not think it necessary further to refer to the
same.
Our invention has reference to the manufacture of the said revolvers whereby
great lightness is secured with the consequent saving of the driving power.
Revolvers made according to our invention are less liable to derangement by wear
and accident than revolvers of the ordinary kind.
In making one of the said revolvers according to our invention we form a
skeleton or frame consisting of end and middle or intermediate plates made
preferably in two parts or halves and fixed on the shaft of the revolver at right
angles, the said frame having in outline the figure of the revolver to be made.
We cover the said frame with sheet iron or other hard sheet metal or alloy
which we attach to the frame by rivetting or otherwise. We thus produce a
revolver of extreme lightness. When it is desired to give additional rigidity to
the revolver we cover the skeleton or frame with plates of sheet iron of the
required curvature and having at those junctions which are at right angles to the
shaft internal flanges. When these internal flanges are rivetted together each
compound flange constitutes as it were an additional internal support to the sheet
iron covering of the revolver. The end and intermediate plates constituting the
skeleton or frame of the revolver may be made by casting or forging or the said
frame may be made from semi-cylindrical bar iron bent into the required shape.
Or each end and intermediate plate of the frame may be made from two bars of
semi-cylindrical iron their flat faces being rivetted together at their middle portions
and their unrivetted ends being curved into the required figure. The said bars
may either pass through the shaft of the revolver or may be curved at their
middle so as to clip or pass round the boss of the shaft.
When the skeleton or frame is made in the last described ways or in analogous
ways the curved ends of the revolvers may be coated or covered with sheet iron or
ther sheet metal in the manner herein before described.
The sheet metal- does not in this case extend to the middle portions of the
evolver but a middle diaphragm or division extends from end to end of the

page_text: revolver for the purpose of isolating one side of it from the other.
We make
the said diaphragm or division of a plate or plates of sheet iron or other hard
metal extending from end to end of the revolver, dividing the said revolver into
two halves or divisions.
In open sided revolvers that is revolvers of the last described kind the boss of
- the shaft requires to have such a diameter that the curved end of the revolver
shall work practically air tight against it and in order to give the said boss the
required diameter without unduly increasing its weight we make the said boss
hollow or tubular and fit it concentrically on the solid shaft by means of conical
ferrules driven between the shaft and the tubular boss and fixed in their places by
rivetting or otherwise.
We will now proceed to describe with reference to the accompanying Drawings
the manner in which our invention is to be performed.
The Drawings represent the various improvements in the manufacture of the
revolvers of rotary blowers, exhausters and pumps constituting our invention,
Figure 1 represents in end elevation and longitudinal section a revolver made
according to one of our improvements. The revolver is made up of three cast iron
plates or frames a, a, a with central bosses b. Each of the frames and bosses a, b
is made in two halves bolted together at c, c as represented. The covering of the
frames of the revolver is marked d and consists of six sheet metal plates having
the length of the revolver to be made and curved to the configuration of the end
frames a.
The longitudinal edges of the plates of the covering d are turned at right angles
so as to form flanges on the said edges, some of which flanges take into recesses at e
in the frames a. The flanges of the covering plates at the middle of the convex
portions of the said plates are inserted between the bolting snugs on the frames as
indicated at f, f. The ends of the plates d are without flanges and are rivetted to
the frames a, a in the manner shown in the Drawing.
In Figure 2, which represents in end elevation and longitudinal section another
revolver constructed according to our invention, the covering plates are divided by
'transverse divisions into three parts d, d², d³, each of the portions d, d², d³ con-
sisting of two parts d', d³ (see the end elevation). The parts & and d³ are connected
with the end frames a in the way represented and described with respect to
Figure 1 excepting that there are no junctions and flanges as at e Figure 1. The
covering d, d², d³ is supported internally and the revolver strengthened and the
three parts connected together by means of flat supporting plates g, g of the kind
represented separately at g Figure 4. The flanged edges of the portions d, d², d³ of
the covering plates are inserted between the plates g, g and by rivetting the said
plates and covering are connected together as will be understood by an examination
of the longitudinal section Figure 2.
Figure 3 represents in end elevation and longitudinal section a revolver made
according to another of our improvements. In this revolver the covering plate h
is made in one piece and is fixed by its flanged edges being inserted between the
This revolver has a middle
flanges of the end frames a as represented at i
support a² rivetted to the covering plate as will be understood by an examination
of the longitudinal section.
Figure 4 represents in end elevation and longitudinal section another of our
improvements in the manufacture of revolvers. In this revolver the end frames k
are made of two iron frame pieces rivetted together as represented, their ends being
separated for the reception of the flanges of the covering d, which said flanges are
secured between the snugged ends of the iron end frames k by screwing as repre-
sented. Besides the end frames k, k similar frames k², are fixed in the middle
of the revolver as represented in the longitudinal section. The covering is divided
longitudinally into two parts, which are secured together by their flanged edges
being inserted and fixed between the ends of the middle frames k², k². The
covering is supported at its ends and middle by means of three flat plates g one of
which is shown separately at the right hand side of Figure 4. The way in which

page_text: the plates g are connected to the covering plates d will be understood by an
examination of the Drawing.
Figure 5 represents in end elevation and longitudinal section, another revolver
constructed according to our invention. In Figure 5 the end frames are made in
one piece and have internal flanges to which the covering is rivetted as represented
in the longitudinal section. The covering d is made in two pieces as represented in
the end elevation connected by lap joints at m, m, which joints are brazed.
Figure 6 represents in end elevation and longitudinal section another revolver
constructed according to our invention. This modification is suited for the manu-
facture of a light revolver. This revolver consists of two flat end frames n, n of
the kind represented at g Figure 4 and a covering & formed of one piece of sheet
metal lap jointed as represented in the end elevation. The ends of the covering d
are flanged and the said covering is connected by the said flanges to the end
frames n, n by rivetting.
Figure 7 represents another modification of a revolver made according to our
invention. In this revolver the end frames p, p are made in two parts rivetted
together, the inner part carrying the boss and the outer part being a strengthening
plate. The covering d is made in two parts, lap jointed as represented at d², d²
and brazed. The covering d is connected to the end frames p, p by its flanged ends
being inserted and rivetted between the two parts of which each of the end frames
is composed as will be understood by an examination of the longitudinal section.
Figure 8 represents a modification which differs only from that represented
in Figure 7 in the respect that the covering d is made in four parts connected
longitudinally together by their flanged edges at d³, d³,
Figure 9 represents in end elevation and longitudinal section an open sided
revolver constructed according to one of our improvements. This revolver is
without end frames and is made wholly of wrought iron or steel. It consists of
the two semi-tubular portions q, q connected together by their flanges r, r. Between
the flanges r, r are the plates 8, 8 extending like the parts and r from end to end
of the revolver. The outer ends of the plates 8, 8 are turned nearly at right angles
and to these the covering plates d, dare rivetted as represented. In order to
support the covering d, d² more efficiently sector shaped brackets u, u flanged on
three sides are rivetted at their inner ends to the semi-tubular pieces q, q and to
the covering plates d, d². In this modification, the covering plates d, d² are not
continuous, that is, the covering plate d does not join the covering plate d³ and but
for the middle plates 8, 8 there would be a passage for air from one side of the
revolver to the other. The plates 8, 8 constitute a longitudinal diaphragm dividing
the revolver into two parts which are isolated from one another by the said plates
instead of by the continuous covering of the arrangements herein before described.
Four sets of the sector like supporting brackets u are by preference employed as
represented in the longitudinal section.
Figure 10 represents a modification of Figure 9. In this modification the semi-
tubular parts q, q, the diaphragm 8, 8 and the covering d, d² are made of two
symmetrical parts as will be understood by an examination of the end elevation.
Figure 11 represents another modification. This modification resembles that
last described excepting that it is divided by transverse divisions into three parts
connected together by pairs of flanged sectors or brackets.
Figure 12 represents another modification. In this modification the revolver is
made up as follows. Each of the semi-tubular parts q carries one of the plates of
the double diaphragm 8, 8. Between the two plates of the diaphragm is the middle
plate u Each of the parts d, d² of the covering consists of two curved plates the
inuer edges of which are flanged. The flanges are inserted and rivetted between
the plates 8, s constituting the diaphragm and the middle plate u.
covering d, d² is supported by two double sector shaped brackets as seen in the
longitudinal section.
The
In the modifications Figures 9. 10. 11 and 12, a solid cylindrical axis of much
less diameter than the central tubular part q is inserted in the said tubular part q

page_text: and fixed therein by ferrules at the ends of q, q. By this arrangement each of the
revolvers is provided with middle portions q, q of the requisite diameter for the
other revolver to work against while great lightness is obtained.
Those parts of the revolvers made of sheet iron are preferably shaped or fashioned
by stamping or pressing by which method of manufacture great accuracy of figure
is given to the said parts which work practically air tight with a minimum of
friction and without contact. From the accuracy of their figure the parts are
interchangeable. The frames of the revolver may have the requisite truth given to
those portions requiring accuracy of figure by the process called machining, thus
furnishing a true bearing for the outside metallic covering.
Having now described the nature of our invention and the manner in which the
same is to be performed, We wish it to be understood that We do not limit ourselves
to the precise details herein described and illustrated as the same may be varied
without departing from the nature of our invention.
But We claim as our invention of Improvements in the manufacture of the
revolvers of rotary blowers exhausters and pumps :-
First Making the said revolvers of end or end and intermediate plates or
frames with a continuous covering of sheet metal by the several methods herein
before described and illustrated in Figures 1. 2. 3. 4. 5. 6. 7 and 8 of the accom-
panying Drawings.
Secondly-Making the said revolvers wholly from sheet metal the several parts
being formed, arranged and combined in the several ways herein before described
and illustrated in Figures 9. 10. 11 and 12 of the accompanying Drawings.
In Witness whereof I the said William Allday have hereunto set my hand and
seal this twenty third day of June in the year of our Lord one thousand eight
hundred and eighty-four.