An Improved Funnel for Dust-collectors.
Year: 1894

page_text: Date of Application, 27th Jan., 1894
Complete Specification Left, 20:h Oct., 1894-Accepted, 24th Nov.,
1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by FRANZ PROKUPEK, of Monza, near Milan, in the
Kingdom of Italy.]
An Improved Funnel for Dust-collectors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
This invention relates to an improved funnel for dust collectors.
The dust collectors heretofore employed present the inconvenience that a
considerable part of the dust, including mill dust, is carried away with the air
which, after having passed in its whirling movement along the lateral wall of the
cone of the collector, escapes therefrom at the upper part.
The modifications in the said apparatus, devised for the purpose of breaking the
current of air in order to obviate this inconvenience, have in their turn the defect
of causing a great quantity of air to pass into the sacks designed for collecting the
dust.
My improved device, adapted to be used for weak as well as for strong currents
of air, consists substantially of a funnel which may be mounted upon any ordinary
dust-collecting apparatus the lower truncated extremity of which has previously
been removed. This device is not only furnished with means for breaking the
current, but also with means by which the orifice provided at the lower part of the
apparatus may be regulated.
If the sacks attached to the lower part of the funnel are excessively inflated too
much air is introduced into them, and it is necessary to increase the section of the
passage at the lower extremity of the cone in order that the air may, as it whirls,
rise along the cone and escape at the upper part.
If on the contrary the sacks fold up under the action of too energetic an interior
suction it is necessary to contract the orifice provided at the lower end of the
cone, in order to moderate the back movement of the air from the bottom to
the top.
In the interior of the funnel, which is fixed to the extremity of the cone of the
dust collecting apparatus, are also secured vanes occupying at their lower part the
whole interior diameter of the funnel with the exception of the central circumference.
These vanes are cut at the upper part in accordance with the profile of the cone
which is rivetted upon them and which they hold in such a manner that their
radial width is reduced.
The vanes form cylindrical helices by which they cut the interior surface of
the cylinder of the funnel, and conical helices by which they cut the truncated
cone.
The descending current of air subdivided by the cone will break against the
vanes, and as the intervals between the vanes offer it a very extended section of
passage, it allows the total amount of dust which it holds in suspension to pass
along the interior wall of the funnel.
It remains to be described how the regulation hereinbefore referred to is
effected.
Suppose the wall of the truncated cone to be provided interiorly with another
cone formed of very thin and flexible sheet metal, and terminating in a circular
orifice. Now imagine the lateral surface of the flexible cone to slide downwards
while it is kept against the surface of the truncated cone in such a manner that the

page_text: circular orifice will gradually be contracted. By acting in this manner any inter-
mediate value between the area of the circular orifice and nil may be obtained for
the lower orifice of the passage for the air passing upwards.
This gradual regulation is effected by means of a thumb nut the bolt of which
is fitted to slide in the interior of a slot provided in the exterior fixed cone,
while the head of a rivet designed to keep the two cones together is displaced
during the regulation along another slot pierced in the side of the flexible interior
cone.
Dated this 27th day of January 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Funnel for Dust-collectors.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 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 an improved funnel for dust collectors.
The dust collectors heretofore employed present the inconvenience that a
considerable part of the dust, including mill dust, is carried away with the air
which, after having passed in its whirling movement along the lateral wall of the
cone of the collector, escapes therefrom at the upper part.
The modifications in the said apparatus, devised for the purpose of breaking the
current of air in order to obviate this inconvenience, bave in their turn the defect
of causing a great quantity of air to pass into the sacks designed for collecting the
dust.
My improved device, adapted to be used for weak as well as for strong currents
of air, consists substantially of a funnel which may be mounted upon any ordinary
dust collecting apparatus the lower truncated extremity of which has previously
been removed, so that the funnel and collector form only a single apparatus after
mounting.
This device is not only furnished with means for breaking the current, but also
with means by which the orifice provided at the lower part of the apparatus may
be regulated.
If the sacks attached to the lower part of the funnel are excessively inflated too
much air is introduced into them, and it is necessary to increase the section of the
passage at the lower extremity of the cone in order that the air may as it whirls
rise along the cone and escape at the upper part.
If on the contrary the sacks fold up under the action of too energetic an interior
suction it is necessary to contract the orifice provided at the lower end of the
cone, in order to moderate the back movement of the air from the bottom to
the top.
In the accompanying drawing
Figure 1 shows a vertical section of the lower part of a dust collecting apparatus
provided with the funnel forming the subject of this invention.
Figure 2 is a plan or view from above of Figure 1 and
Figures 3 and 4 represent the vanes designed to break the current as hereinafter
set forth.
In the interior of the funnel B which is fixed to the extremity of the cone of the
dust collecting apparatus A are also secured vanes d d occupying at their lower part
the whole interior diameter c of the funnel with the exception of the central circum-
ference. These vanes y are cut at the upper part in accordance with the profile of

page_text: the coue C which is rivetted upon them and which they hold in such a manner that
their radial width is reduced at k (Figure 1).
The vanes d are represented in plan Figure 4, while Figure 3 shows in elevation
the cylindrical helices by which they cut the interior surface of the cylinder of the
funnel B having a diameter c and conical helices by which they cut the truncated
cone C the diameter of the large base of which is shown at a and that of the small
base at f.
The descending current of air subdivided by the cone C, a, fwill break against
the vanes, d (see the arrows Figure 3) and as the intervals e between the vanes
offer it a very extended section of passage, it allows the total amount of dust which
it holds in suspension to pass along the interior wall of the funnel.
It remains to be described how the regulation hereinbefore referred to is
effected.
Suppose the wall of the truncated cone C af to be provided interiorly with
another cone the large base of which is seen at b formed of very thin and flexible
sheet metal, and terminating exactly as C af in a circular orifice whose diameter
is f. Now imagine the lateral surface of the flexible cone to slide downwards
while it is kept against the surface of the truncated cone C af in such a manner that
the circular orifice will gradually be contracted. It will be seen that by acting
in this manner any intermediate value between the area of the circular orifice f
and nil may be obtained for the lower orifice of the passage for the air passing
upwards.
The position of the flexible cone when the orifice is entirely closed is shown in
dotted lines in Figures 1 and 3, where the upper base of the flexible cone will be
placed at and the lower base is reduced to a point h constituting the apex of the
cone, into which the truncated cone represented in full lines is transformed.
This gradual regulation is effected by means of a thumb nut j the bolt of which
is fitted to slide in the interior of a slots provided in the exterior fixed cone Caf,
while the head of a rivet a designed to keep the two cones together is displaced
during the regulation along another slot t pierced in the side of the flexible interior
cone.
.
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 :-
A funnel for dust collectors, characterized by vanes designed to break the air
current, carrying a fixed truncated cone which is provided interiorly with a flexible
cone adapted to become deformed so as to gradually contract or even completely
obstruct the lower orifice of the fixed truncated cone.
3 L: 20th den of Ontaho 1901
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.