IMPROVEMENTS IN BOLTING MACHINES
Year: 1880

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort on the Main, in the Empire of Germany, for an
Invention of "IMPROVEMENTS IN BOLTING MACHINES." A communication from
Messrs. Weber & Bunzli, Manufacturers, of Uster, in the Republic of
Switzerland.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 28th February 1880.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frankfort
on the Main, in the Empire of Germany. "IMPROVEMENTS IN BOLTING
MACHINES." [A communication from Messrs. Weber & Bunzli, Manufacturers,
of Uster, in the Republic of Switzerland.]
This Invention relates to centrifugal bolting machines wherein the meal is
separated from the husks or bran and is sorted into different degrees of fineness by
the action of a series of revolving beaters inside a revolving cylindrical screen
placed in an inclined position.
According to one of the present improvements the whole meal is introduced
at the inlet end of the machine into a cylindrical screen of wire gauze or
perforated metal situated concentrically within the bolting cylinder or drum
and extending some distance along the same, its inner end being closed;
within this inner cylinder are revolving blades or beaters, by the action of which
the meal is thrown against the screening surface through which the meal passes
into the bolting drum, while the husks or bran and very coarse particles are
retained in the cylinder. These husks and coarse particles find their way from
the cylinder into outlet passages leading from near the inner end thereof through
the outer bolting drum, so that as the cylinder and drum revolve together
the husks or bran fall through such passages into a special shoot situated below
them, passing through the meal shoots, and by which they are conducted away
out of the machine.
The inclination of the axis of the beaters and bolting drum with its inner
screen is rendered adjustable by supporting the ends thereof in bearings
suspended by side trunnions in forked supports, of which the one for the
lower or delivery end is adjustable in height by means of a screw. The part of
the axis carrying the driving pulley is made separate from the other part and is
Price 6d1

page_text: carried in fixed horizontal bearings, the connection between this part and the
before described inclined part being effected by a universal joint or by a driver,
such as is used in lathes.
The regulation of the speed of rotation of the bolting drum is effected by
means of a friction disc bearing against the underside of a rim on the inlet end
and driven through speed reducing gearing from the before-mentioned driving
shaft. The inner end of the shaft of the friction disc is carried in a bearing that
is adjustable in height by a screw so as to keep the disc in more or less close
frictional contact with the drum.
The blades or beaters of the machine are constructed of longitudinal metal strips 1
that are partly slit down from their outer edge inwards at short intervals of their
length, and the parts so slit are alternately bent to a certain angle backwards
and forwards, whereby the beaters are caused to effectually divide or break up
the mass of meal as they throw it against the bolting surface.
The blades are stiffened by having another longitudinal strip of metal rivetted to 1
the back thereof.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 24th August
1880.
on
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frankfort
the Main, in the Empire of Germany. "IMPROVEMENTS IN BOLTING
MACHINES." A communication from Messrs. Weber and Bunzli, Manufacturers, of
Uster, in the Republic of Switzerland.
This Invention relates to centrifugal bolting machines wherein the meal is
separated from the husks or bran and is sorted into different degrees of fineness by
tho action of a series of revolving beaters inside a revolving cylindrical screon
placed in an inclined position.
According to one of the present improvements the whole meal is introduced
at the inlet end of the machine into a cylindrical screen of wire gauze or
perforated metal situated concentrically within the bolting cylinder or drum
and extending some distance along the same, its inner end being closed;
within this inner cylinder are revolving blades or boaters, by the action of which
the meal is thrown against the screening surface through which the meal passes
into the bolting drum, while the husks or bran and very coarse particles aro
retained in the cylinder. These husks and coarse particles find their way from the
cylinder into outlet passages leading from near the inner end thereof through the
outer bolting drum, so that as the cylinder and drum revolve together the husks or
bran fall through such passages into a special shoot situated below them, passing
through the meal shoots, and by which they are conducted away out of the machine.
The inclination of the axis of the beaters and bolting drum with its inner
screen is rendered adjustable by supporting the ends thereof in bearings suspended
by side trunnions in forked supports, of which the one for the lower or delivery
end is adjustable in height by means of a screw. The part of the axis carrying the
driving pulley is inado separate from the other part and is carried in fixed horizontal
bearings, the connection between this part and the before described inclined part
being effected by a universal joint or by a driver, such as is used in lathes.
The regulation of the speed of rotation of the bolting drum is effected by means of
n friction disc bearing against the underside of a rim on the inlet end and driven
through speed reducing gearing from the before mentioned driving shaft. The
inner end of the shaft of the friction disc is carried in a bearing that is adjustable
in height by a screw, so as to keep the disc in a more or less close frictional contact
with the drum.
The blades or beaters of the machine are constructed of longitudinal metal
strips that are partly slit down from their outer edge inwards at short
intervals of their length, and the parts so slit are alternately bent to a certain
angle backwards and forwards, whereby the beaters are caused to effectually divide
or break up the mass of meal as they throw it against the bolting surface.
The blades are stiffened by having another longitudinal strip of metal rivetted

page_text: particles of meal which pass through the perforations or holes of the cylinder into
the outer drum D covered with gauze, while the husks escape through the outlet E
into a busk shoot F which leads them out of the machine separately from the meal.
The greater or less inclination of the bolting drum D or of the beater shaft I, which
depends upon the nature of the mcal, is effected by a special arrangement of the 5
bearings G and H. The beater shaft I is carried in the bearings G and H that are
provided with trunnions on which they can 'turn, and the bearing H can be raised
or lowered by means of the screw K acting on the saddle piece L that carries tho
trunnions of the bearing. In order to prevent the driving strap from running off,
the part 1 of the beater shaft that carries the driving pulley is horizontal and runs 1
in fixed bearings M and N, and motion is imparted from this part of the shaft to
the adjustable part, either by a universal joint or by a carrier.
The speed of rotation of the bolting drum is regulated by the friction roller O which
receives its motion by toothed gearing P from the shaft I, and whose axis Q can be
raised or lowered by the screw R, so that the friction roller always remains in contact 1
with the drum. The beater shaft I has 12 beater blades C and S running parallel to
the shaft, and which are of strong sheet iron strengthened by having iron bars rivetted
to their back surface. The beater blades are slit up about 04 of their width by
parallel cuts into a number of small blades, which are alternately bent forwards
and backwards as indicated at Figs. 1, 2, and 3. By this form of the beater blades 2
the mass of meal is effectually broken up or separated out as it is thrown against
the drum, being thus more effectually screened, while at the same time the blades
do not offer so much resistance when revolving rapidly, as the air can pass readily
through the slits.
Having thus described the nature of this Invention, and in what manner the 2
same is to be performed, as. communicated to me by my correspondents, I claim in
respect of bolting machines,―
First. The combination of the preparatory screening cylinder B with beaters C,
with the outlet E, and shoot F for separating the husks from the meal.
Second. Supporting the bearings G, H, on trunnions so as to be capable of 3
adjusting themselves to the greater or less inclined position of the beater shaft I.
Third. In combination with the adjustable beater shaft I, the shaft I carrying
the driving pulley running in fixed bearings and connected to the shaft I either by
a universal joint or by a carrier, for the purposes herein described.
Fourth. In combination with the bolting cylinder, the friction roller O for 3
regulating its speed, the said roller being adjustable by means of a screw R in order
to maintain its contact with the drum as the inclination of this is varied.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Seventeenth day of August, in the year of our Lord One thousand
eight hundred and eighty.