IMPROVEMENTS IN ROTARY BLOWERS
Year: 1884

page_text: I FERDINAND BOSSHARDT of the firm of Bosshardt & Grant Mechanical
& Consulting Engineers and Patent Solicitors of 24 & 32 Bulls Head, Exchange
Chambers Market Place Manchester in the County of Lancaster do hereby declare
the nature of my Invention for "IMPROVEMENTS IN ROTARY BLOWERS" which
has been communicated to me from abroad by Christian Hoppe of Bockenheim
near Frankfurt in the Empire of Germany to be as follows:-
"
My invention relates principally to that class of rotary blowers in which a pair
of working revolvers mounted on separate shafts and rotated in opposite directions
in a double cylindrical casing, are employed and has for its object. Firstly to effect
a steady and uniform delivery of air, and silent working of the revolvers. Secondly
to prevent leakage of air and undue friction between the revolvers and the casing.
Thirdly to lubricate the periphery of the revolvers and the interior surface of the
casing in which the revolvers work, automatically. Fourthly to obtain a greater
pressure of air than heretofore has been the case and to keep the blower and the
air always cool.
To this end I employ in a suitable casing a pair of revolvers each one consisting
of a suitable number of teeth. fixed on shafts and revolving in suitable bearings at
opposite directions. The said revolvers are arranged in the casing, in sections,
corresponding in number to the number of teeth of the said revolvers and are kept
apart from each other by means of partitions formed on the inside of the casing.
Each section being set different on the shaft in order that the teeth of the revolvers
of the different sections will not be fully engaged simultaneously thus obtaining a
very steady, working of the revolvers and uniform air delivery. The said revolvers
are provided on their sides with discs, which are of the same thickness as the
partitions and in diameter exactly the size of the pitch line of the revolvers. The
partitions are so formed as to receive one half of such discs thus forming an
additional partial bearing for the revolvers. By preferance I make the latter of
paper pulp either solid or hollow and make the same adjustable in a horizontal
direction by means of two conical bushes. One bush is suitably fixed on the ends
of the shafts, and bearing against a shoulder formed thereon, and the other bush
122
دو

page_text: provided at each end with a thread and lock-nut, fits on the first named bush and
inside the bearings and is held in its position when the locknut is screwed against
each end of the bearings thus retaining the revolvers in their proper positions.
The bearing on the driving side of the blower is arranged to swivel around its
shaft and when in the required position is bolted down firmly, against the end
plate of the blower by means of bolts, the heads of which slide in a circular slot
formed in the end plate. The object of this arrangement is to fix the bent part of
the bracket or bearing always in the opposite direction to which the strap is
drawing thus taking a great deal of friction and strain from the shaft.
To effect an easy adjustment of the sides of the revolver casing to the periphery
of the revolvers and to prevent undue friction and leakage I hinge the said sides of
the casing opposite to the delivery to the flanges of the end plates of the casing by
means of pins. The said casing is screwed to the flange of the top or delivery part
of the casing by means of a suitable number of screws which serve to adjust the
casing to the periphery of the revolver. The ends of the side of the said casing
are formed with flanges fitting between the end plates and provided with small
slots through which screws are screwed into the end plate. It will thus be seen
that the amount of adjustment of the sides of the casing can be regulated by means
of the screws, which causes the interior surface of the sides of the casing next to
the delivery to bear slightly against the periphery of the revolvers and form a good
joint, the screws then being tightened up will thus keep the sides of the casing in
their proper positions. The said sides of the casing may also be made adjustable
in the manner represented, where screws are arranged at the delivery part and at
the suction part, thus adjusting the said casing in a horizontal direction to the
periphery of the revolver and retaining the same in the proper position by means
of tightening the screws:
U.
The lubricating of the inner surface of the casing and the periphery of the teeth
I effect in. two different ways. One method consists in forming the teeth of the
said revolvers hollow and filling the same with consistent fat through holes formed
in the periphery of the revolvers. When the blower is working the consistent fat
becomes a little warm and on account of the centrifugal force is then caused to
leave its cavity and pass through the holes forined in the periphery of the revolvers,
thus lubricating the inner surfaces of the casing as well as the periphery of the
revolvers, automatically.
Another method consists in fitting or casting to the outsides of the sides of the
casing a reservoir which communicates with the interior of the casing by means of
a hole formed in the sides of the casing. The said reservoir is also filled with
consistent fat and suitably closed and has near its top and above the fat a pipe
attached which is connected with the delivery of the blower. When the blower
is working the air from the delivery will pass through the said pipe and press onto
the consistent fat thus forcing the same gradually from the reservoir into the
interior of the casing and lubricating both revolver and casing simultaneously and
automatically.
To obtain a very high pressure of air I arrange a combination of blowers, in
which the air is gradually compressed. In such combination the revolvers may be
placed above each other, or side by side and arranged in sections or otherwise.
Any suitable number of blowers may be fixed on a bed plate, a suitable distance
apart and connected together by means of pipes or trunks through which the air is
transmitted from one blower to the other.
The revolver casings and pipes or trunks may be provided with water-jackets
in order to keep the air and the blower cool when working under high pressure..
Dated this 6th day of March A.D: 1884.

page_text: "
I, FERDINAND BOSSHARDT of the firm of Bosshardt & Grant, Mechanical and
Consulting Engineers & Patent Solicitors of 24 & 32 Bulls Head Exchange
Chambers Market Place Manchester in the County of Lancaster, do hereby declare
the nature of my Invention for "IMPROVEMENTS IN ROTARY BLOWERS
which
has been communicated to me from abroad by Christian Hoppe of Bockenheim
n Frankfurt in the Empire of Germany 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 principally to that class of rotary blowers in which, a pair
of working revolvers mounted on separate shafts and rotated in opposite directions
in a double cylindrical casing, are employed and has for its object, Firstly to effect
a steady and uniform delivery of air and silent working of the revolvers. Secondly
to prevent leakage of air and undue friction between the revolvers and the casing.
Thirdly to lubricate the periphery of the revolvers and the interior surface of thie
casing in which the revolvers work, automatically. Fourthly to obtain a greater
pressure of air than heretofore has been the case and to keep the blower and the
air always cool.
And in order that my invention may be more fully understood I have caused to
be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in various figures.
Fig 1 is a side view shown partly in section of a blower constructed according
to my invention. Figs 2 & 3 are cross sections showing two different ways of
adjusting the casing to the revolver, formation of the latter and one method of
lubricating the interior surface of the casing and periphery of the revolver.
Fig 4 is a cross section of one side of the casing, and shows another method
of lubricating the interior surface of the casing and periphery of the revolver.
Fig 5 is a side view of a combination of blowers for obtaining a very high
pressure.
Fig. 6 is a section of the revolver shaft bearing showing the means for adjusting
the revolvers in their casing in a horizontal direction.
Referring to Figs 1, 2. 3. 4 a is the casing of a blower constructed in accordance
with my invention. b are the revolvers consisting of a suitable number of teeth
fixed on shafts and revolving in suitable bearings d at opposite directions. The
said revolvers b are arranged in the casing a in sections corresponding in number
to the number of teeth of the said revolvers b and are kept apart from each other
by means of partitions e formed on the inside of the casing a. Each section being.
set different on the shaft c in order that the teeth of the revolvers of the different
sections will not be fully engaged simultaneously, thus obtaining a very steady
working of the revolvers and uniform air delivery. The said revolvers b are
provided on their sides with discs f which are of the same thickness as the
partitions e and in diameter exactly the size of the pitch line of the revolvers b.
-,』 "

page_text: The said partitions e are so formed as to receive one half of such disc f thus
forming an additional partial bearing for the revolvers. By preferance I make
the latter of paper pulp either solid or hollow and make the same adjustable in a
horizontal direction by means of two conical bushes g h, (see Fig 1 and enlarged
Fig 6). The bush g is suitably fixed on the ends of the shafts c bearing against a
shoulder i formed thereon. The bush h provided at each end with a thread and
locknut k, fits on the bush g and inside the bearings d and is held in its position
when the lock-nut k is screwed against each end of the bearings d thus retaining
the revolvers b in their proper positions.
The bearings d on the driving side of the blower are arranged to swivel around
their shafts and when in the required position are bolted firm against the end
plate of the blower by means of bolts the heads of which slide in a circular slot
formed in the end plate: The object of this arrangement is to fix the bent part of
the bracket or bearing d always in the opposite direction to which the strap is
drawing thus taking a great deal of friction and strain from the shaft e, To effect
an easy adjustment of the sides of the revolver casing to the periphery of the
revolvers b and to prevent undue friction and leakage I hinge the said sides of the
casing a (see Fig 2) opposite to the delivery A to the flanges of the end plates of
the casing a by means of pins e¹, The said casing a is screwed to the flange of the
top or delivery part of the casing by means of a suitable number of screws a¹
which serve to adjust the casing a to the periphery of the revolver. The ends of
the side of the said casing a are formed with flanges fitting between the end plates
and provided with small slots. through which screws 61 are screwed into the end
plate It will thus be seen that the amount of adjustment of the sides of the
casing can be regulated by means of the screws a³, which causes the interior
surface of the sides of the casing next to the delivery to bear slightly against the
periphery of the revolvers and form a good joint, the screws b¹ then being tightened
up will thus keep the sides of the casing in their proper position. The said sides
of the casing a may also be made adjustable in the manner represented in Fig 3.
where screws a¹ are arranged at the delivery part A and at the suction part B thus
adjusting the said scasing in a horizontal direction to the periphery of the revolver
and retaining the same in the proper position by means of tightening the screws b¹.
The lubricating of the inner surface of the casings and the periphery of the
teeth I effect' in two different ways. One method consists in forming the teeth of
the said revolvers b hollow (sec Fig 3) and filling the same with consistent fat
through holes formed in the periphery of the revolvers. When the blower is
working the consistent fat becomes a little warm and on account of the centrifugal
force is then caused to leave its cavity and pass through the holes formed in the
periphery of the revólvers b, thus lubricating the inner surfaces of the casing as
well as the periphery of the revolvers automatically.
Another method consists in fitting or casting to the outsides of the sides of
the casing (see Fig 4) a reservoir m which communicates with the interior of
the casing by means of a hole formed in the sides of the casing a, The said
reservoir m is also filled with consistent fat and suitably closed and has near its
top and above the fat a pipe n attached, which is connected with the delivery A
of the blower. When the blower is working, the air from the delivery A will
pass through the said pipe n and press onto the consistent fat thus forcing the same
gradually from the reservoir into the interior of the casing and lubricating both
revolver and casing simultaneously and automatically.
To obtain a very high pressure of air I arrange a combination of blowers as
illustrated by Fig 5, in which the air is gradually compressed. B is the inlet and
A the delivery. In such combination the revolvers b may be placed above each
other as illustrated by Fig 5 or side by side, and arranged in sections or otherwise.
Any suitable number of blowers may be fixed on a bed plate o, a suitable distance
appart and connected together by means of pipes or trunks p through which the
air is transmitted from one blower to the other. *
+

page_text: The revolver casings a and pipes or trunks p may be provided with water-jackets
in order to keep the air and the blower cool when working under high pressure,
The working of such a combination of blowers is as follows:-
The air being drawn into the first or large blower and is delivered to the next
adjacent blower by means of the pipe or trunk p under a pressure of about one
half of an atmosphere. Such pressure is then increased in the second blower
according to its proportion and transmitted to the third blower through a pipe or
trunk p, under a pressure of about one atmosphere. The third or smallest blower
will increase the air pressure again and deliver the air at A, under a pressure of
about one atmosphere and a half.
It will thus be seen that by increasing the number and size of blowers of such
combination any desired pressure can be obtained.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I declare that what
I claim is
First. In rotary blowers arranging the revolvers 6 in sections and fixing the said
revolvers on their shafts in such positions which will cause the different sections to
come into full gear at different times and equal intervals during the whole of their
revolutions in order to obtain a steady working of the revolvers and uniform air
delivery, substantially as described and illustrated in the annexed drawings by
Figs 1, 2 & 3.
Second. Producing the revolvers 6 of paper pulp or vulcanized fibres either
hollow or solid for the purpose of obtaining a silent working of the revolvers as
described and illustrated in the Figs 1, 2 & 3 of the annexed drawings.
Third. The arrangement for adjusting the revolvers axially and radially and
sides of casing a in a horizontal or radial direction for the purpose specified
substantially as described and illustrated in Figs 1, 2, 3, and 6.
Fourth. The employment of a swivel bearing or bracket d, for the purpose
specified substantially as described and illustrated in Fig 1 of the drawings.
Fifth. Automatically lubricating the inner surface of the casing a and periphery
of revolvers as described and illustrated by Figs 3 and 4.
Sixth. The use and combination of blowers as illustrated by Fig 5, in the
annexed drawings for the purpose specified and substantially described.
Seventh. Providing the casing and pipe or trunk through which the hot air
passes, with a water-jacket for the purpose specified and substantially described.
Dated this 11th day of February A.D. 1885.