Collectors and Apparatus therefor.
Year: 1885

page_text: Collectors and Apparatus therefor.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co, Patent
Agents, Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of my invention for "IMPROVEMENTS RELATING TO THE REMOVAL OF
DUST FROM DUST COLLECTORS AND APPARATUS THEREFOR to be as follows:-
"
This invention relates to a method of, and apparatus for, removing dust from
the filtering surfaces of horizontal rotary dust-collecting drums.
The said method consists in admitting a current of air into the drum while the
latter is at rest and being operated upon by knockers, the said current of air
passing through the filtering surfaces and removing the particles of dust deposited
thereon. The current of air is produced either by the exhauster which draws the
air to be purified through the drum or by a separate fan.
According to the said invention the dust-collecting drum, which revolves upon a
horizontal shaft and is supported in a casing, is provided with radial filtering
surfaces converging in pairs towards one another. The dust deposits on the outer
sides of these filtering surfaces when, by the action of the exhauster, a rarefaction
of the air in the interior of the drum is effected. The air containing dust enters
the chambers which are formed by the filtering surfaces of the drum, and the dust
deposits upon, the filtering surfaces, so that only purified air passes through the
latter to the interior of the drum, and through the exhauster into the atmosphere.
The cleansing of the filtering surfaces from dust is effected by the combined
action of a current of air, passing from the interior of the drum through the filtering
surfaces to the outside, and of a knocking-off device which shakes the filtering
surfaces, while the current of air passes through them. Accordingly the removal
of the dust is accomplished by simultaneous shaking and blowing, which produces
most advantageous results.
In the construction of the improved apparatus, the purifying current of air
is produced by the exhauster for causing the rarefaction of air in the interior of
the drum, and rotating upon a suitable shaft. The said purifying current of
air produced during the rotation of the exhauster is forced through a tube firmly

page_text: supported in the interior of the drum, and having a longitudinal slit communicating
with a chamber situated below the drum.
The purifying current passes in an opposite direction to the air drawn through
the drum, that is to say, it passes through the said tube and then from the latter
through the slit downward into one of the chambers of the drum, which chambers
are formed between every two adjacent filtering surfaces. In this manner, the air
passes through the respective filtering surfaces from the interior to the outside.
The detached dust falls into a discharge channel placed beneath the drum
and provided with a screw-conveyer whereby the dust is discharged from the
apparatus.
The said tube extends beyond the casing around the periphery of the exhauster,
and terminates in a box, which has its open side towards the exhauster. The
purifying current of air is forced into this box as the exhauster rotates and then
passes into the said tube and from the latter through the slit into the chamber
situated exactly beneath, and formed between, two filtering surfaces.
By means of an analogous arrangement, a purifying current of air can be
produced by an exhauster arranged at the other end of the shaft.
While the cleansing of. the filtering surfaces of a chamber is taking place, the
drum remains at rest. During this time, the knocking-off of the dust is effected by
means of a knocking device.
This device consists of a rod terminating in a hammer which strikes against the
stationary bottom of a chamber. The said rod is fixed to an axis which is
supported below, and parallel to, the drum, An arm fixed upon the outer end of
the said axis at an acute angle to the rod or handle of the hammer is engaged
by a second arm upon a second shaft.
After the second arm has moved out of engagement with the first arm, the latter
is returned to its normal position by a spring striking upon the bottom of the
chamber which is lowest.
In consequence of the blows, the dust is shaken from the filtering surfaces and
this action is arrested by the current of air passing through the said filtering
surfaces. The bearing piece in which the axis or shaft carrying the hammer or
knocker is supported is attached by bolts to the casing. These bolts pass through
slits in the said bearing piece and thus permit the adjustment of the latter.
In order that the hammer or knocker shall not interfere with the revolution of
the drum, the said knocker is held in position by a spring which is attached to the
said bearing piece and acts as a stop, until the arm on the knocker is engaged by
the arm on the second shaft. A pin serves for guiding the spring throwing the
hammer or knocker upward which pin passes through a projection at the lower
portion of the said bearing piece and has on its upper end above the spring a collar,
through the medium of which the spring is compressed when the hammer moves
away from the bottom of the drum. The upper rounded point of the pin enters a
depression in the arm on the knocker-shaft.
..
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LOOK

page_text: Improvements relating to the Removal of Dust from Dust
Collectors and Apparatus therefor.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co, Patent
Agents, Southampton Buildings, in the County of Middlesex, 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 :-
This invention relates to a method of, and apparatus for, removing dust from the
filtering surfaces of horizontal rotary dust-collecting drums.
The said method consists in admitting a current of air into the drum while the
latter is at rest and while it is operated upon by knockers, the said current of air
passing through the filtering surfaces, and removing the particles of dust deposited
thereon.
The said current of air is produced either by the exhauster which draws the air
to be purified through the drum, or by a separate fan.
As shown in Figure 1 of the accompanying drawing, the dust-collecting drum A
revolves upon a horizontal shaft and is supported in the casing A². This drum is
provided with radial filtering surfaces converging in pairs towards each other.
The dust deposits on the outer sides of these filtering surfaces, when, by the action
of the exhauster C Figures 1, 2 and 3, a rarefaction of the air in the interior of
the drum is effected. The air containing dust enters the chambers K which are
formed by the filtering surfaces of the drum A, and the dust deposits upon the
filtering surfaces, so that only purified air passes through the latter to the interior
of the drum and through the exhauster C into the atmosphere.
The cleansing of the filtering surfaces from dust is effected by the combined
action of a current of air passing from the interior of the drum through the
filtering surfaces to the outside, and of a knocking-off device which shakes or
vibrates the filtering surfaces while the current of air passes through them.
Accordingly the removal of the dust is accomplished by simultaneous shaking and
blowing, which produces most advantageous results.
In the construction of the improved apparatus shown in the drawings by way of
example, the purifying current of air is produced by the exhauster C causing the
rarefaction of air in the interior of the drum A and rotated by means of the
shaft C. The said purifying current of air produced during the rotation of
the exhauster is forced through the tube B which is firmly supported in the
interior of the drum and has a longitudinal slit 6 communicating with a chamber a
situated below the drum A.
The purifying current of air passes in the reverse direction to the air drawn
through the drum by the exhauster, that is to say, it passes in the direction
indicated by the arrows through the said tube B and then from the latter through
the slit b downward into one of the chambers a of the drum, which chambers are
formed between every two adjacent filtering surfaces. In this manner-the-air

page_text: passes through the respective filtering surfaces in the direction of the arrows from
the interior to the exterior.
The detached dust falls into a discharge channel placed beneath the drum
and provided with a screw conveyor whereby the dust is discharged from the
apparatus.
The said tube B extends beyond the casing A¹ around the crown D of the
exhauster C as indicated in Figure 3, and terminates in a box B¹ which has its
open side towards the exhauster. The purifying current of air is forced into this
box B¹ by the exhauster and then passes in the direction of the arrows Figure 3,
into the said tube B and from the latter through the slit 6 into the chamber a
situated exactly beneath and formed between two filtering surfaces.
By means of an analogous arrangement, a purifying current of air can be
produced by an exhauster arranged at the other end of the shaft C¹.
While the cleansing of the filtering surfaces of a chamber a is taking place, the
drum A remains at rest. During this time, the knocking off of the dust is effected
by means of a knocking device, the construction of which is illustrated in
Figure 4.
This device consists of a rod terminating in a hammer which strikes against
the stationary bottom a¹ of a chamber a. The said rod is fixed to an axis k¹ which
is supported below and parallel to the drum A. The arm w having upper contact
or striking plates and fixed upon the outer end of the said axis at an acute angle
to the rod or handle of the hammer, is engaged by a second arm v upon the shaft I
which rotates in the direction of the arrows. It is then released and thrown
back by the spring L'. The hammer k therefore first moves back and shortly
afterwards strikes upon the bottom of the lowermost chamber. By reason of the
vibration caused by the blows of the said hammer, the dust is shaken from the
filtering surfaces and this action is assisted by the current of air passing through
the said filtering surfaces. The bearing piece Z, in which the axis or shaft carrying
the hammer or knocker is supported, is attached by bolts to the casing A¹. These
bolts pass through slits 2' in the piece Z and thus permit the adjustment of the
latter as required.
In order that the hammer or knocker shall not interfere with the revolution of
the drum, the said knocker is held in position by a spring Z³, which is inserted in
an edge-piece Z of the said bearing piece Z and acts as a stop, the hammer k is
held down against the pressure of the spring L until the arm w of the knocker
shaft is engaged by the arm on the second shaft v. A pin serves for guiding the
spring L' for throwing the hammer or knocker upward; the pin Y is passed
through a projection.Z³ at the lower portion of the said bearing piece Z and has on
its upper end above the spring La collar y, through the medium of which the
spring is compressed when the hammer_moves away from the bottom of the drum.
The upper rounded point of the pin Y enters a depression in the arm won the
knocker shaft.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is :-
First. The above described method of removing dust from the filtering surfaces
of rotary dust-collectors by forcing a current of air into the chambers of the drum
when the latter is at rest and whilst it is operated upon by knockers, the said air
passing through the filtering surfaces and detaching the dust adhering to the same,
as above specified.
Second. In a dust collecting apparatus, the tube B connected with a fan, or with
a box B¹ which has its open side towards the exhauster of the said dust collecting
apparatus so that, in the operation of the said apparatus, a current of air is forced
into the said box and thence into the tube B, substantially as, and for the purpose
described.

page_text: Third. In a dust collecting apparatus, a knocking device for the filtering surfaces
consisting of a hammer k fixed on an axis or shaft ¹, and an arm w which is
operated through the medium of an arm on the shaft I, in combination with the
adjustable bearing piece Z, substantially as described.
Fourth. In the said apparatus, the springs Land Z for throwing forward and
holding back the hammer k, substantially as described.
HASELTINE, LAKE & Co.,
Agents for the Applicant.