GB1592142A - Adjustable smoke extraction assemblies - Google Patents

Description

(54) IMPROVEMENTS IN OR RELATING TO ADJUSTABLE SMOKE EXTRACTION ASSEMBLIES (71) We, PLYMOUTH PP AB, a com- pany duly organized under the laws of Sweden, 6f Industricentrum, 921 00 Lycksele, Sweden, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to an adjustable assembly for the extraction of, for instance, gases, smoke, powder and dust at their source of generation.

Prior art smoke extraction assemblies are generally either complicated or difficult to move from one location to another, such as from one working place to another.

According to the invention, there is provided an adjustable assembly for extraction of smoke, gases, dust, powder etc., a"t their source of generation, which comprises a suction pipe connected to an exhaust device, a suction funnel, a suction hose of variable length extending between sa'id suction and said-suction funnel whereby the pos.ftron of said funnel can be adjusted, said hose be- ing flexible in all directions and normally extending along a substantially vertical path between said pipe .and, said funnel, .and means for maintaining' said funnel in a desired, adjusted position along said vertical path, said means being disposed within the hose and comprise a" balancing plummet suspended by a line and substantially balancing the mass of said hose and of said funnel.

The assembly of the invention is simple, cheap to manufacture, 'easy to mount and requires little effort to be moved from one location to another.

The invention will be described in 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.

In the drawing, 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 vertical 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 between the funnel and the bend 4 of the suction pipe 3.

The suction 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 funnel 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 c,ompressed in its longitudinal direction until the wires of the spiral are brought so close to each other that only the glass 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 fabric is fully stretched.

Inside the flexible suction hose 7 there are means 8 for retaining the funnel 6 in a desired, adjusted vertical 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 stationary 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 unfluence 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 (not 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, the portion of the line extending between its ends passing over a guide means which is mounted in the pipe bend 4 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.

WHAT WE CLAIM IS:- 1. An edjustable assembly for extraction of smoke, gases, dust, powder, etc., at their Source of generation, which comprises a suction pipe connected to an exhaust device, a suction funnel, a suction hose of variable length extending between said suction pipe and said suction funnel whereby the position of said funnel can be adjusted, said hose being flexible in all directions and normally extending along a substantially vertical path between said pipe and said funnel, and means for maintaining said funnel in a desired, adjusted position along said vertical path, said means being disposed within the hose and comprise a balancing plummet suspended by a line and substantially balancing the mass of said hose and of said funnel.

2. An assembly as claimed in Claim 1, wherein said line is attached at one end to said pipe and at the other end to said funnel, the portion of the line which extends between the ends thereof running over a guide means mounted on said balancing plummet and over at least one fixed guide means mounted in said pipe.

3. An assembly as claimed in Claim 1, wherein said line is attached at one end to said funnel and at the other end to said balancing plummet, the portion of the line which extends between the ends thereof running over a guide means mounted in said pipe.

4. An assembly as claimed in any one of the preceding claims, wherein at least one of said guide means exerts a frictional force on said line in order to make the line run more slowly.

5. An assembly as claimed in claim 4, wherein one or all of said guide means exerting said frictional force has or have a friction increasing deflector surface.

6. An assembly for extraction of, for instance, smoke, gases, powder and dust, constructed substantially as hereinbefore described and claimed with reference to the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. 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 stationary 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 unfluence 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 (not 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, the portion of the line extending between its ends passing over a guide means which is mounted in the pipe bend 4 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. WHAT WE CLAIM IS:-

1. An edjustable assembly for extraction of smoke, gases, dust, powder, etc., at their Source of generation, which comprises a suction pipe connected to an exhaust device, a suction funnel, a suction hose of variable length extending between said suction pipe and said suction funnel whereby the position of said funnel can be adjusted, said hose being flexible in all directions and normally extending along a substantially vertical path between said pipe and said funnel, and means for maintaining said funnel in a desired, adjusted position along said vertical path, said means being disposed within the hose and comprise a balancing plummet suspended by a line and substantially balancing the mass of said hose and of said funnel.

2. An assembly as claimed in Claim 1, wherein said line is attached at one end to said pipe and at the other end to said funnel, the portion of the line which extends between the ends thereof running over a guide means mounted on said balancing plummet and over at least one fixed guide means mounted in said pipe.

3. An assembly as claimed in Claim 1, wherein said line is attached at one end to said funnel and at the other end to said balancing plummet, the portion of the line which extends between the ends thereof running over a guide means mounted in said pipe.

4. An assembly as claimed in any one of the preceding claims, wherein at least one of said guide means exerts a frictional force on said line in order to make the line run more slowly.

5. An assembly as claimed in claim 4, wherein one or all of said guide means exerting said frictional force has or have a friction increasing deflector surface.

6. An assembly for extraction of, for instance, smoke, gases, powder and dust, constructed substantially as hereinbefore described and claimed with reference to the accompanying drawing.