GB2046858A - Articulated duct - Google Patents

Articulated duct Download PDF

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Publication number
GB2046858A
GB2046858A GB7913367A GB7913367A GB2046858A GB 2046858 A GB2046858 A GB 2046858A GB 7913367 A GB7913367 A GB 7913367A GB 7913367 A GB7913367 A GB 7913367A GB 2046858 A GB2046858 A GB 2046858A
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GB
United Kingdom
Prior art keywords
duct
friction
articulated
arms
sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7913367A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Allwright C G
Original Assignee
Allwright C G
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Allwright C G filed Critical Allwright C G
Priority to GB7913367A priority Critical patent/GB2046858A/en
Publication of GB2046858A publication Critical patent/GB2046858A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
    • F16L27/0849—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid being turned through an angle when passing from one joint element to another
    • F16L27/0857—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid being turned through an angle when passing from one joint element to another with hinge and bellows sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/002—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using a central suction system, e.g. for collecting exhaust gases in workshops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool

Abstract

An articulated duct comprises d duct sections (2, 3, 4, 5) connected together by friction elbow joints (6) and flexible bellows members (7). Each friction elbow joint (6) comprises at least one pair of arms (8, 9) one end of each of which is secured to one of the adjacent ends of said duct sections and the other ends of which overlap and are pivotally connected together by a pivot member (13). A friction pad (11) is interposed between the overlapping ends of the arms (8, 9). Preferably a friction washer (12) is provided on the opposite side of one of the arms (9) to the friction pad (11) and a disc spring (12a) is provided on the opposite side of the other arm (8) to maintain the arms (8, 9) in frictional engagement with the friction pad (11) and friction washer (12). The friction pad (11) and friction washer (12) provide sufficient frictional resistance with the arms (8, 9) to maintain the duct sections in a required articulated position whilst permitting their articulation to a different required position. <IMAGE>

Description

SPECIFICATION Articulated duct This invention relates to ducting for air extractor or air blowing means.
In many industrial operations, such as welding or sanding, smoke, fumes and/or dust are produced which for health and safety reasons need to be removed at source before they enter the general atmosphere of the factory or workshop. Where such industrial operations are carried out at a fixed location it is a simple matter to provide suitable air extractor means at that location. However, when there is a requirement for such industrial operations to be carried out at various different locations it becomes necessary to provide air extractor means which can be positioned, within limits, at a required location.
The present invention has as its object to provide an articulated duct for use with air extractor or air blowing means whereby an inlet or outlet end of such duct can readily be positioned as required.
The present invention provides an articulated duct comprising at least two duct sections which are connected together by a friction elbow joint whereby said sections can be articulated relative to one another.
Said friction elbow joint may comprise a pair of arms one end of each of which is connected to one of the adjacent ends of said duct sections and the other ends of which are pivotally connected together with the interposition therebetween of a friction pad which will create sufficient frictional resistance in the pivotal connection as to maintain the duct sections in a required articulated position whilst allowing their articulation to a different required position. A further friction pad may be provided on the opposite side of one of each arm to said first friction pad so that said other end of one or each arm is sandwiched between two friction pads.Where a further friction pad is provided on the opposite side of one arm only, a suitable resilient means, e.g., a disc spring or spring washer, may be provided on the opposite side of the other arm, said resilient means serving to maintain frictional engagement between said arms and said friction pads. Preferably the adjacent ends of the duct sections each have a pair of diametrically opposed arms extending outwardly therefrom each of which is pivotally connected to the corresponding arm of the other duct section.
Said duct sections may be formed from sheet metal material and in order to provide sufficient support for said arms the adjacent ends of the duct sections may each have a metal ring secured, e.g., welded, thereto, preferably internally thereof, said one end of said arms being secured, e.g., welded, to said rings.
A flexible bellows member extends between the adjacent ends of the duct sections over said friction elbow joint.
Preferably the duct comprises a plurality of duct sections, e.g., four sections, which are connected together by friction elbow joints as aforesaid. A first duct section at one end of the duct may be connectable to suitable air extractor or air blower means by way of a swivel joint so that said first duct section can be rotated through 360 . The duct section at the other end of the duct may be flared outwardly toward its outer end to form an inlet or outlet hood.
The duct of the present invention may be used with any suitable air extractor or air blowing means, e.g., may be used with portable air extractor means such as a portable electrostatic air cleaner or air filter apparatus, or may be used with fixed air extractor or air blowing means such as by being connected to a fixed duct of an air conditioning or air cleaning system.
The invention will be more particularly described with reference to the accompanying drawings, in which: Figure 1 is an elevation, partly in section, of an articulated duct according to the invention, Figure 2 is an underneath plan view of the duct of Fig. 1, and Figure 3 is a detail view of a friction elbow joint used in the duct of Figs. 1 and 2.
Referring to the drawings it will be seen that the duct 1 illustrated comprises for sheet metal duct sections 2, 3, 4, 5 which are connected together by friction elbow joints generally indicated at 6 and by flexible bellows members 7.
The friction elbow joint 6 between the duct sections 3 and 4 comprises a pair of diametrically opposed arms 8 extending outwardly from the duct section 3 and a pair of diametrically opposed arms 9 extending outwardly from the duct section 4, the arms 9 each being cranked as shown at 10 so that the outer end of each of the arms 9 overlaps the outer end of an arm 8. Friction pads 11 are interposed between the overlapping ends of the arms 8 and 9 and a friction washer 12 is provided on the opposite side of the arm 9 to the friction pad 11. On the opposite side of the arm 8 to the friction pad 11 is a disc spring 1 2a which maintains the arms 8 and 9 in frictional engagement with the friction pad 11 and friction engagement with the friction pad 11 and friction washer 12. If desired or necessary a second friction washer 12 could be interposed between arm 8 and disc spring 12a.A screw, bolt, rivet or like pivot member 13 extends through the overlapping ends of the arms 8 and 9 and through the friction washer 12, disc spring 1 2a, and the friction pad 11 to pivotally connect each arm 8 to an arm 9. The friction pad 11 and friction washer 12 provide sufficient frictional resis tance with the arms 8 and 9 to maintain the duct sections in a required articulated position whilst permitting their articulation to a different required position. Each of the arms 8 is welded or otherwise secured to a ring 14 welded or otherwise secured within the adjacent end of the duct section 3. Likewise each of the arms 9 is secured to a ring 15 secured within the adjacent end of the duct section 4.
The friction elbow joint 6 between the duct sections 2 and 3 is exactly the same as that between the duct sections 3 and 4. The friction elbow joint 6 between the duct sections 4 and 5 is similar to that between the duct sections 3 and 4, the only difference being that instead of the arms 8 and 9 being in diametrically opposed pairs they are secured to an upper portion of each of the rings 14 and 15 and extend outwardly and downwardly instead of in the axial direction of their respective duct sections as in the case of the other friction elbow joints 6.
The flexible bellows members 7 each extend over a friction elbow joint 6 and are secured to the adjacent ends of adjacent duct sections by mean of suitable clips or clamps 16.
The duct section 2 has an annular flange 17 thereon which is received between a seating ring 18 on a fixed duct 1 8a and a securing ring 19 secured to the seating ring 18 so as to provide a swivel joint enabling the duct section 2 to be rotated about its axis through 360 .
The duct section 5 flares outwardly as shown towards its outer end to form an inlet or outlet hood. A handle 20 is provided on the duct section 5 to facilitate the movement of this duct section to a required position.
It will readily be appreciated that because the duct 1 can be rotated about the axis of the duct section 2 and because the duct sections can be articulated relative to one another by virtue of the friction elbow joints 6, the duct section 5 which forms the inlet or outlet hood can be positioned as required anywhere within a radius determined by the maximum extent of the duct 1.
The fixed duct 1 8a may be either a fixed duct of a portable air extractor or air blower means, e.g., a portable electrostatic air cleaning apparatus, or may be a fixed duct of an air cleaning or air conditioning installation.

Claims (12)

1. An articulated duct comprising at least two duct sections which are connected together by a friction elbow joint whereby said duct sections can be articulated relative to one another.
2. An articulated duct according to claim 1, wherein said friction elbow joint comprises a pair of arms one end of each of which is connected to one of the adjacent ends of said duct sections and the other ends of which are pivotally connected together with the interposition therebetween of a friction resistance in the pivotal connection as to maintain the duct sections in a required articulated position whilst allowing their articulation to a different required position.
3. An articulated duct according to claim 2, wherein a second friction pad is provided on the opposite side of at least one of said arms so that said other end of the at least one arm is sandwiched between two friction pads.
4. An articulated duct according to claim 3, wherein a second friction pad is provided on the opposite side of one arm only and wherein resilient means is provided on the opposite side of the other arm said resilient means serving to maintain frictional engagement between said arms and said friction pads.
5. An articulated duct according to claim 4, wherein said resilient means comprises a disc spring or spring washer.
6. An articulated duct according to any one of the preceding claims, wherein said duct sections are connected together by two said friction elbow joints.
7. An articulated duct according to claim 6, wherein the adjacent ends of the duct sections each have a pair of diametrically opposed arms extending outwardly therefrom each of which is pivotally connected to the corresponding arm of the other duct section.
8. An articulated duct according to any one of the preceding claims, wherein said duct sections are formed from sheet metal material.
9. An articulated duct according to claim 8, wherein the adjacent ends of the duct sections each have a metal ring secured thereto, said one end of said arms being secured to said rings.
10. An articulated duct according to claim 9, wherein said rings are secured internally of the adjacent ends of the duct sections.
11. An articulated duct according to any one of the preceding claims, wherein a flexible bellows member extends between the adjacent ends of the duct sections over said friction elbow joint.
12. An articulated duct substantially as herein described with reference to the accompanying drawings.
GB7913367A 1979-04-17 1979-04-17 Articulated duct Withdrawn GB2046858A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7913367A GB2046858A (en) 1979-04-17 1979-04-17 Articulated duct

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7913367A GB2046858A (en) 1979-04-17 1979-04-17 Articulated duct

Publications (1)

Publication Number Publication Date
GB2046858A true GB2046858A (en) 1980-11-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB7913367A Withdrawn GB2046858A (en) 1979-04-17 1979-04-17 Articulated duct

Country Status (1)

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GB (1) GB2046858A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540202A (en) * 1981-02-10 1985-09-10 Andre Amphoux Articulated tubular conduit arm for sucking gaseous fluids
US4860644A (en) * 1988-02-29 1989-08-29 Donaldson Company, Inc. Articulatable fume exhauster trunk
US5336130A (en) * 1993-03-04 1994-08-09 Metal-Fab, Inc. Adjustable exhauster arm assembly
US5427569A (en) * 1992-04-21 1995-06-27 Plymex Fabriksforsaljning Ab Adjustable local extraction device
US5536206A (en) * 1995-02-10 1996-07-16 Airflow Systems, Inc. Articulated duct fume collection and exhaust apparatus
US6203590B1 (en) 1999-03-25 2001-03-20 Steris Corp Surgical smoke evacuation system with replaceable filter cartridge module and accumulated filter usage display
WO2007015663A1 (en) * 2005-08-04 2007-02-08 Fumex Ab Lockable friction joint

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540202A (en) * 1981-02-10 1985-09-10 Andre Amphoux Articulated tubular conduit arm for sucking gaseous fluids
US4860644A (en) * 1988-02-29 1989-08-29 Donaldson Company, Inc. Articulatable fume exhauster trunk
US5427569A (en) * 1992-04-21 1995-06-27 Plymex Fabriksforsaljning Ab Adjustable local extraction device
US5336130A (en) * 1993-03-04 1994-08-09 Metal-Fab, Inc. Adjustable exhauster arm assembly
US5536206A (en) * 1995-02-10 1996-07-16 Airflow Systems, Inc. Articulated duct fume collection and exhaust apparatus
US6203590B1 (en) 1999-03-25 2001-03-20 Steris Corp Surgical smoke evacuation system with replaceable filter cartridge module and accumulated filter usage display
WO2007015663A1 (en) * 2005-08-04 2007-02-08 Fumex Ab Lockable friction joint

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