ADJUSTABLE SMOKE EXTRACTION ASSEMBLY

TRADUCTION NON-DISPONIBLE

English Abstract

Abstract of the Disclosure
Assembly for extraction of smoke, gases, etc. which
Comprises a suction funnel that is adjustable to any desired
position. To this end, the funnel is attached to a suction
hose which is flexible in all directions and the length of
which is variable and which, together with the suction funnel,
is retained in the desired position by means of a balancing
device.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An adjustable assembly for extraction of smoke, gases,
dust, powder etc. at their source of generation, which comprises
a suction pipe (3) connected to an exhaust device, a suction
funnel (6), a suction hose (7) of variable length and extending
between said suction pipe and said suction funnel, and means
(8) for variation of the length of the hose and thus of the
position of said funnel (6), wherein said hose (7) is flexible
in all directions and normally extends substantially vertically
between said pipe (3) and said funnel (6), and said means (8)
for varying the length of said hose are disposed within the hose
and comprise a balancing plummet (12) suspended by a line (9)
and substantially balancing the mass of said hose (7) and of
said funnel (6) so as to maintain said funnel in the desired,
adjusted position.
2. Assembly as claimed in claim 1, wherein said line (9)
is attached at one end (10) to said pipe (3) and at the other
end (11) to said funnel (6), the portion of the line which
extends between the ends thereof running over a guide means (13)
mounted on said balancing plummet (12) and over at least one
guide means (14) mounted in said pipe.
3. Assembly as claimed in claim 1, wherein said line (9)
is attached at one end to said funnel (6) and at the other
end to said balancing plummet (12), the portion of the line
which extends between the ends thereof running over a guide
means (14) mounted in said pipe (3).

4. Assembly as claimed in claim 2 wherein at least one
of said guide means (13, 14) exerts a frictional force on
said line (9) in order to make the line run more slowly.
5. Assembly as claimed in claim 4, wherein at least one
of said guide means (14) exerting said frictional force has
or have a friction increasing deflector surface (15).
6. Assembly as claimed in claim 5 wherein said deflector
surface is stationary.
7. Assembly as claimed in claim 2 wherein said line (9)
comprises a plurality of runs and the number of guide means
mounted in said pipe corresponds to the number of runs.

Description

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The present invention relates to an adjustable assembly
for the extraction of, for instance, gases, smoke, powder and
dust at their source of generation, comprising a suction pipe
preferably connected to an exhaust device, a suction funnel, a
suction hose the length of which is variable and which extends
between the suction pipe and the suction funnel, and means for
- optional variation of the length of the hose and,thus, of the
position of the funnel.
Prior art smoke extraction assemblies of the above type are
either complicated or difficult to move from one location to
another, in general from one working place to another.
According to the invention, these problems are so~ved in
that the hose is flexible in all directions and normally extends
substantially vertically between the pipe and the funnel, and in
that the means for varying the hose length are disposed inside
the hose and comprise a balancing plummet suspended by a line
and substantially balancing the mass of the hose and of the fun-
nel so as to maintain the funnel in the desired adjusted posi-
tion.
The assembly of the invention is simple, cheap to manufac-
tue, easy to mount and requires little effort to be moved from
one location to another.
The invention will be described is greater detail below
with reference to the accompanying drawing, in which a preferred
embodiment is shown schematically in side elevation, a suction
hose forming part of the assembly being shown in sectional view
in order clearly to illustrate the means disposed within the ~
hose.
2 -

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In the dra~ling, the smoke extraction assembly according to
the invention is suitably, but not necessarily, suspended by an
articulated, horizontally pivotal arm 1 which is mounted by
means of a mounting 2 to a suitable support, for example a ver-
tical wall or the like.
The extraction assembly comprises a suction pipe 3 which
is composed of a bend 4 mounted at the outer, free end of the
arm 1, and a pipe length 5 which is preferably flexible and
extends between said pipe bend and a suction fan (not shown),
only a short portion of the pipe length 5 being shown in the
drawing.
The assembly further comprises a suction funnel 6 and a
suction hose 7 normally extending substantially vertically bet~
ween the funnel and the bend 4 of the suction pipe 3. The suc-
tion hose 7 is secured in a substantially air-tight manner to
the vertical portion of the pipe bend 4 and to the upper portion
of the suction funnel 6 by suitable fastening means (not shown),
for instance hose clamps. The suction hose 7 is flexible in all
directions and its length is variable such that the suction fun-
nel 6 can be moved to any desired position and retained in this
position by appropriate means which will be described in greater
detail below. The suction hose 7 may consist of a steel spiral
which has a certain spacing between the wires of the spiral and
is coated with a thin glass fibre fabric, whereby the hose can
be compressed in its longitudinal direction until the wires of
the spiral are brought so close to each other that only the
~lass fibre fabric separates them. The maximum extension of the
suction hose 7 depends on both the total length of the hose and
the distance between the wires of the spiral when the glasS fibre
. 3

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fabric is fully stretched.
Inside the flexible suction hose 7 there are means 8 for
optional. variation of the hose length and thus of the vertical
position of the funnel 6, and for retaining the funnel in the
desired, adjusted position. In the shown embodiment, the means 8
comprise a line 9 of a suitable material, for example plastic or
steel, which at one end 10 .is attached to the suction pipe 3, and
more precisely to the bend 4 of the pipe, and at the other end 11
to suitable fastening means on the suction funnel 6. A balancing
plummet 12 is suspended on the line 9 between the ends thereof by
means of a guide pulley 13 rotatably mounted on the plummet, and
is dimensioned so as substantially to balance the mass of the
hose 7 and of the funnel 6, thereby maintaining the funnel in the
adjusted position. In addition, the line 9 passes over a guide
means 14 which is mounted within the pipe bend 4 and has a sta-
tionary deflector surface 15 for increasing the friction with the
line, thus making the line run more slowly so as to prevent the
funnel 6 from slowly moving upwardly or downwardly by its own
force and/or under the influence of the elasticity of the hose 7.
In order further to increase the motional resistance, it is
possible to provide, inside the hose, a telescopic device (now
shown) which also serves as guide means for the funnel 6, such
that the hose 7 is maintained in vertical alignment, and the
funnel 6 is thus maintained in a vertical position below the
downwardly directed portion of the pipe bend 4.
In an alternative embodiment, the line 9 has only one run~
i.e. in that it is attached at one end to the funnel 6 and
at the other end to the balancing plummet 12,

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the portion of the line extending between its ends passing
over a guide means which is mounted in the pipe bend and
corresponds to the guide means 14.
In particular uses, for example when the suction hose 7
is of a considerable length and/or the suction funnel 6 is
heavy, as may be the case when additional equipment, tools
etc. are suspended in the funnel, the line may comprise more
than one or two runs as defined above, e.g. four or six,
there being then provided a corresponding number of guide
means in the pipe bend and the funnel.