Year: 1887

page_text: Date of Application, 8th Sept., 1887
Complete Left, 25th May, 1888
Complete Accepted, 6th July, 1888
I, GUSTAV BEHRNS, Machine manufacturer, residing at Lubeck, in the free-state of
Lubeck, German empire, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the dust-collector described in the specification of the
British patent A.D. 1886, No. 2168, the said dust-collector substantially consisting of
an inverted filtering-bag, fixed with its open end to an aperture in the top of a chamber
into which passes the dust-laden air, of means for causing the said bag to collapse at
intervals, for subsequently closing the same and for reexpanding it quickly in order
to produce a back-current of air through the pores of the bag in view of cleaning it
from adhering dust, the dust being thereupon removed and the bag reopened.
The improvements constituting my present invention consist in the particular means
employed for closing the bag or bags, for allowing them to collapse, for reexpanding
them and for collecting and removing the dust.
The filtering bag, or a combined group of bags are attached at the top to ropes
running over pulleys and secured with their other ends to a weight which keeps the
bags expanded. Through a hole in the centre of the weight passes a travelling chain,
driven by any motive power and provided with collars, the said collars acting through
the medium of a disengaging device on the weight so as to lift it to a certain height,
and to cause the said ropes to become slack and the bags to collapse. The weight is
thereupon released from the chain and, in descending, reexpands the bags.
For closing the bag or bags previous to their being expanded, and for collecting the
dust, there is arranged below the said bag or bags a vertically-movable funnel, and
within the latter is suspended a cone, adapted to close the bottom orifice of the funnel.
The funnel is connected to a vertical rod passing through a hole in the aforesaid
weight and having a collar for the weight to act against when it is near the end of its
upward motion. The rod being thus raised by the weight, will raise the funnel, so as
to cause the same to bear with its upper rim against the top of the dust-chamber to
which the bags are attached, and with the lower portion of its inner surface against
the aforesaid cone, the bags being thereby closed. In this position the rod and the

page_text: funnel are retained by a pall, acting on the former, until the collar of the travelling-
chain that bad lifted the weight, strikes against the pall and releases the rod which
thereupon drops down together with the funnel. The passage for dust-laden air into
the bags is then again free, and the dust collected in the funnel falls through a spout
into a bag tied thereto.
In the described arrangement of the bag-closing contrivance there is always an open
communication between the dust-chamber and the aforesaid spout. This communica-
tion may be avoided by means of a stationary funnel fixed at the bottom to the spout
and connected at the top by means of a flexible sleeve to the movable funnel, in com-
bination with an additional cone integral with the aforesaid cone, both cones being free
to slide up and down on a rod, and the distance of the two cones from each other being
such that, when the movable funnel is lifted, it will raise the lower cone by means of
the upper one, whereas, when the movable funnel is lowered, the lower cone, on
settling within the stationary funnel, closes the same, the upper cone simultaneously
coming out of contact with the movable funnel.
Dated the Sith oy of Santowhan 1007

page_text: COMPLETE SPECIFICATION.
Improvements in Dust-collectors.
1, CLARA BEHRNS, of Lubeck, Widow and legal representative of Gustav Behrns,
Machine Manufacturer, late of Lubeck in the free State of Lubeck, German Empire
(deceased), 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 the dust-collector described in the specification of the
British patent A.D. 1886, No. 2168, the said dust-collector substantially consisting of
an inverted filtering bag fixed with its open end to an aperture in the top of a chamber
into which passes the dust-laden air, of means for causing the said bag to collapse at
intervals, for subsequently closing the same and for reexpanding it quickly in order to
produce a back-current of air through the pores of the bag in view of cleaning it from
adhering dust, the dust being thereupon removed and the bag reopened.
The improvements constituting the present invention consist in the particular means
employed for closing the bag, or bags, for allowing them to collapse, for reexpanding
them, and for collecting and removing the dust, as hereinafter fully described.
On the annexed two sheets of drawings Fig. 1 represents in vertical sectional
elevation two dust-collectors A and B, involving the said improvements and placed side
by side, the collector B showing some features in addition to those of the collector A.
Fig. 2 is a transverse sectional view of the collector B. Fig. 3 is a top view corres-
ponding to Fig. 1, and Fig. 4 a transverse section through the lower part of the
collector A. Fig. 5 is a transverse sectional view of the operating parts of the
collector B, drawn to a larger scale, portions of some of the parts being broken away.
Fig. 6 is a fractional plan of the tops of the bags and parts connecting them together.
Figs. 7, 8 and 9 are plans of the parts in Fig. 5 opposite to them.
Each collector is preferably composed of four filtering-bags a closed at the top by
wooden disks e and attached with their open lower ends to corresponding apertures
formed in the casting a' inserted into the top of the chamber g', which is in communi-
cation with the dust-producing machine (not shown in the drawing) by the conduit g².
The said disks e are connected together by a frame h attached to two ropes d running
over the pulleys i, the said ropes being secured with their other ends to a weight c
which thus keeps the bags expanded. The means for causing the bags to collapse
consist in a travelling chain running over the pulleys f, ff, ff, the tension-
pulley having a weight attached to it, and the pulley keyed on a shaft which
is driven by any motive power. The said chain passes through a hole in the centre of

page_text: the weight c and it is provided with collars g, while to the weight c are pivoted a
bifurcated latch o straddling the chain and a spring pall p, adapted to engage the latch
and to keep it down. The chain being but in motion by the driving pulley 7, will
act with its collars g against the latch o, each collar in its turn raising the weight cand
causing the ropes d to become slack, so that the tops of the bags are then free to sink.
The weight is raised until the pall p strikes laterally against an inclined stationary
toer, whereby the pall is pushed away from the latch o and the latter released, so that
the weight being then no more supported by the collar g, descends and reexpands the
bags. During its upward and downward motion the weight is guided by the column n.
For closing the bags previous to their being expanded and for collecting the dust,
the filter A is provided with a vertically-movable funnel b, fitting with its upper rim
to the lower edge of the casting a', and a cone 6 adapted to close the bottom orifice of
the funnel b. The cone 6 is loosely suspended upon a rod 7 secured with its upper
end to a frame 1, while the funnel is fixed by means of arms to a tube in like
manner as shown in Fig. 5, the said tube being arranged to slide on the rod l and
pivoted to a lever t, which in its turn is connected to a rod u guided by the three
arms q, q and wo projecting from the column n. The rod u passes through a hole in
the weight c, and it is provided with a collar against which the weight strikes when
being near the end of its upward motion, so that the rod u is thereby lifted. Moreover
there is pivoted to the arm w, which is close to the upper end of the rod u, a pall a
having two arms, one of these arms being adapted to engage in a notch cut into the
rod u, while through the other arm, which is bifurcated, passes the chain f.
The said notch is arranged at such a point of the rod u that, when the rod is lifted
sufficiently by the weight c to allow the pall a to engage with the notch, the funnel b
will be in its upper position (see Fig. 1A, Fig. 4 and Fig. 5), in which it closes against
the rim of the casting a¹. At the same time the funnel is pressed with the lower
portion of its inside surface against the edge of the cone 6. It then completely
separates the filtering-bags a from the chamber g¹, and the dust dropping from the
bags while being exposed to the cleaning-operation, falls into the funnel and is
retained therein by the cone 6¹. After the weight c has been released from the
collar which had lifted it, the said collar on coming in contact with the pall x,
disengages the same from the rod u, and the rod drops down together with the lever t
and the funnel b until the parts are arrested by a spring y, Fig 5. The funnel then
has the position shown in dotted lines in Fig. 4, in which position it leaves free the
passage from the chamber g¹ to the bags a, while the dust collected in the funnel and
upon the cone 6¹, drops through the space between these parts into the spout c¹ and
thence into a bag to be tied thereto. In the time elapsing between the closing and the
reopening of the filtering-bags, these may be caused to collapse and to reexpand
several times by a repeated lifting of the weight c, brought about by a plurality of
collars g fixed upon the chain fat suitable distances apart.
In order to ensure a complete closure of the bags when the funnel bis in its upper
position, the cone is not fixed to the rod 1, but it is carried by a head or shoulder m,
Fig. 4, formed upon the rod 1, so that the funnel, on being raised, first strikes against
the cone and lifts the same a little, and then comes in contact with the casting a¹.
In the described arrangement of the bag-closing contrivance there is always an open
communication between the chamber g¹ and the spout c¹ and consequently with the bag
tied thereto. This communication may be avoided by means of a stationary funnel z
Figs. 1 B, 2 and 5, fixed at the bottom to the spout c¹ and connected at the top by
means of a sleeve 63 of cloth or leather to the funnel b, in combination with a cone z¹
integral with the cone 6', both cones being fully free to slide up and down on the rod !,
and the distance of the cones from each other being such that, when the funnel 6 is
lifted, it will raise the cone ¹ by means of the cone 61; whereas, when the funnel 6 is
lowered, the cone z in settling within the funnel z, closes the same, the cone 6 at the
same time coming out of contact with the funnel b. Thus, in this case, a closure of
the bags and also of the chamber g' is brought about alternately by the two funnels
and the two cones, and the dust drops in two steps through the closing-device.

page_text: Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is.
1. The combination, with the chamber g' and the inverted bags a, of the weight c
connected to the bags by ropes d running over pulleys i, the travelling chain f passing
through the weight and having collars g for engaging and lifting the weight, and a
disengaging device for releasing the weight from the collars, such as the latch o and
pall p pivoted to the weight and fixed toe r arranged to trip the pall, substantially as
and for the purpose described.
2. The combination, with the chamber g' and the inverted bags a, of the weight c
connected to the bags by ropes d running over pulleys i, the travelling chain passing
through the weight and having collars g for engaging and lifting the weight, a dis-
engaging device for releasing the weight from the collars, funnel b, rod u having the
collar v, means of connection between the rod u and funnel b, pall x adapted to engage
the rod 26, and cone b, substantially as and for the purpose described.
3. The combination, with the chamber g¹ and the inverted bags a, of the weight c
connected to the bags by ropes d running over pulleys i, the travelling chain f passing
through the weight and having collars 9 for engaging and lifting the weight, a dis-
engaging device for releasing the weight from the collars, funnels b and z, sleeve b³,
rod u having the collar v, means of connection between the rod u and funnel b, pall x
adapted to engage the rod u, and cones b¹ and z', substantially as and for the purpose
set forth.