ADJUSTABLE DEVICE FOR EXHAUSTION AND/OR SUPPLY OF GAS

Abstract: The present invention relates to an adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) comprising at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provided for balancing the exhaustion and/or supply conduit (4). In order to provide at such an adjustable device that the balancing device (54) generates balanced forces which correspond with the correct balancing requirement, the force-producing balancing device (54) cooperates with a compensating device (57) which compensates for differences between the balancing force that said force-producing balancing device (54) exerts on the exhaustion and/or supply conduit (4) and the force required for balancing said exhaustion and/or supply conduit in substantially all its positions.

Description: Adjustable device for exhaustion and/or supply of gas. The present invention relates to an adjustable device for exhaustion and/or supply of gases and gas supported par¬ ticles, said device comprising at least one exhaustion and/ /or supply conduit which is pivotable in at least vertical direction, whereby a force producing balancing device is pro¬ vided for balancing the exhaustion and/or supply conduit. US-A-3 818 817 relates to an adjustable device for ex¬ haustion of fumes from working places. This device comprises an exhausting conduit which is adjustable in vertical direc- tion for setting thereof in various operating positions. A force producing device in the shape of tension springs is provided to balance the exhausting conduit such that it main¬ tains the positions set. A problem with this and other balancing devices for ad- justable devices of said type is that said balancing devices do not produce balanced forces corresponding with the actual balancing need. This means that one must use friction links which provide sufficient friction for maintaining the con¬ duit in all positions set. A drawback with friction links providing sufficient friction for maintaining the conduit in said positions is however, that a large frictional effect must be overcome when the conduit is pivoted in vertical di¬ rection, which means that it is heavy to manipulate. The object of the present invention is among other things to see to, at adjustable devices of the abovementioned type, that the balancing device produce balanced forces which correspond with the correct balancing need. This is arrived at according to the invention by providing the abovementio¬ ned device with the characterizing features of claim i. By means of said characterizing features an easily cont¬ rollable conduit is provided, which maintains substantially all its set positions without needing friction links there¬ for, producing great friction forces for this maintenance. The invention will be further described below with re- ference to the accompanying drawings, wherein fig. 1 is a side view of an adjustable device according to the invention having two adjustable conduit members; fig. 2 is a side view of a first alternative embodiment of the adjustable device according to the invention, whereby two adjustable conduit members are provided on an extension device; fig. 3 is a side view of a second alternative embodiment of the adjust¬ able device of the invention, whereby two adjustable conduit members are provided on a longer extension device; fig. 4 is a side view showing two arms forming part of the adjus- table device according to the invention, whereby obscuring members are removed such that a parallelogram device forming part of said arms can be seen; fig. 5 schematically and with a side view illustrates said parallelogram device, where¬ by a portion thereof is set in an upwardly directed position and another portion in downwardly directed position; fig. 6 schematically and with a side view illustrates said paral¬ lelogram device having a portion moved somewhat downwards from the position in fig. 5, while the other member is moved more inwardly from the position of fig. 5; fig. 7 schemati- cally and with a side view illustrates said parallelogram device having one member moved somewhat downwards from the position of fig. 6 and the other member moved somewhat out¬ wards from the position of fig. 6; fig. 8 schematically and with a side view illustrates said parallelogram device where- in one member is moved somewhat upwards from the position in fig. 7, while the other member is moved substantially out¬ wards from the position in fig. 7; fig. 9 is a section along line IX-IX in fig. 4; fig. 10 is a side view of holding and coupling members forming part of the adjustable device, where- by obscuring members have been removed for being able to see into said members; fig. 11 is a side view of an outer arm forming part of the adjustable device; fig. 12 is a plan view of the outer arm of fig. 11; fig. 13 is a vertical sec¬ tion through a suction hood forming part of the adjustable device; fig. 14 is a front view of the suction hood of fig. 13; fig. 15 is a section X7-XY in fig. 14 through an ancho¬ ring device for a flange forming part of the hood of fig. 13; fig. 16 is a side view, partly in section, of members of the extension device in the embodiment of fig. 2; fig. 17 is a side view, partly in section, of a joint portion of the members illustrated in fig. 16; fig. 18 is a section along line X7III-X7III in fig. 17; fig. 19 is a section along line XIX-XIX in fig. 17; fig. 20 is a perspective view over a part of the exhaustion and/or supply conduit of the adjustable device according to the invention, said part having a hose lock; fig. 21 illustrates the exhaustion and/or supply conduit of fig. 20 with the hose lock in some¬ what open condition; fig. 22 is a section through the hose lock of figs. 20 and 21 and end portions of pipe and hose forming part of the exhaustion and/or supply conduit. The adjustable device 1 illustrated in the drawings is at first hand adapted for exhaustion of gases and gassuppor- ted particles from work places, e.g. air contaminated with unhealthy welding fume generated at work places for welding. The adjustable device 1 consists of an exhausting conduit 4 having a first conduit member 4a, a second conduit member 4b and a passage 4c for gas transport. The exhaustion conduit 4 is adjustable for setting in suitable position relative to the place or spot where contaminants and/or other particles are generated, such that these can be exhausted before sprea¬ ding. The exhausting conduit 4 is also adjustable in such a way that its position can be altered from one place to another for e.g. successive movements during progress of welding or other work. The exhausting conduit 4 includes, in the embodiment shown, a link device 2 (so called swivel device), a support arm 3 provided on the link device 2 and a hood 5, all cons¬ tituting the outer members of the exhausting conduit 4. The link device 2 is adapted to permit pivoting of the exhausting conduit 4 in horizontal direction in parts of a turn or more. The exhausting conduit 4 is pivotable in ver- tical direction such that the hood 5 can be set in various heights and/or at various distances e.g. from the link de¬ vice 2. The hood 5 is adapted to facilitate effective collec- tion of gas to be exhausted. At the embodiment shown, the link evice 2 is mounted on a cantilever 8 (see fig 10) which is screwed onto the wall 7 through suitable fixing means 9 and it has shanks 10 directed outwardly from the wall 7. T_ιe link device 2 comprises yokes 11 permitting said device 2 to be threaded onto the shanks 10, whereafter said device 2 can be fixed to said shanks 10 by means of suitable fixing means (not shown). A fan aggregate 6 or another evacuating unit can be mounted on the link device 2 and is designed such that the exhausting conduit attains the required suction effect. The air is suck into the fan aggregate 6 throuth a lower tubular air inlet 12 and it is discharged through a sidewardly direc- ted air outlet 13 and guided out from the premises through a hose 14 connected to said outlet. The link device 2 comprises a vertically directed link shaft 15 and a bracket 16 attached thereto and horizontally directed and having the shape of a square- tube. The link shaft 15 is at the top pivotally mounted in the link device 2. If the load on the link shaft 15 is great, said shaft is preferably pivotally mounted in a support means 17 which is fixedly mounted on the cantilever 8. The link device 2 further comprises a gas passage 18 formed by an upper and a lower passage portion 19, 20. The upper portion 19 of the air passage 18 is through a connec¬ ting means 21 of a suitable type attached to the bracket 16 such that said gas passage 18 is moved along with said bracket during rotation thereof. The upper passage portion 19 has a tubular upper member 22 fitting the outside of an air inlet provided on the link device 2 such that it pivotally connects thereto. The lower passage portion 20 can be threaded onto the link shaft 15 and it can be snapped onto the upper pas¬ sage portion 19 while said passage portions 19, 20 are provi- ded with snap portions 20a. These are preferably formed such that they provide sealing between the passage portions 19, 20. The verticaly pivotable carrier or support arm 3 con- sists of a first and a second arm 23, 24 of which the first arm 23 is mounted on the link device 2 while the second arm 24 is mounted on the outer portions of said first arm 23. The first arm 23 is mounted on the link device 2 through a rear link means 25. For this purpose the rear link means 25 has a fixing portion 26 which can be inserted into the bracket 16 and attached thereto by means of bolts 27 or si¬ milar fixing means. The link means 25 further comprises a link portion 28 located at a distance outside the bracket 16. The link portion 28 has a lower link 29 with a horizon¬ tal link shaft 30 which preferably is provided somewhat above an extension of the lower edge of the air passage 18. The link portion 28 further has an upper link 31 with a ho¬ rizontal link shaft 32. In the lower link 29 a pivoting arm 33 is pivotally mounted about the horizontal link shaft 30 in such manner that said pivoting arm can be swung or pivoted in vertical direction. On the outer end of the pivoting arm 33 there is provided an intermediate link means 34, through a lower link 35 with a.horizontal " link shaft 36, in such a way that the intermediate link means 34 can pivot in vertical direction relative to the pivoting arm 33. In the upper link 31, about the horizontal link shaft 32, there is pivotally mounted a parallel guide bar 37 in such manner that said bar can pivot in vertical direction. The outer end of the parallel guide bar 37 is pivotally mounted on an upper link 38 on the inter¬ mediate link means 34 in such manner that said bar can swing or pivot about a horizontal link shaft 39. By means of the pivoting arm 33 and the parallel guide bar 37 a portion Pi of a parallelogram device is obtained, which permits movement of the intermediate link means 34 with maintained positional orientation relative to the hori¬ zontal plane when the first conduit member 23 is pivoted in vertical direction. The second arm 24 is mounted on the intermediate link means 34 such that also said arm can pivot in vertical direc¬ tion. For mounting the second arm 24 the intermediate link means 34 comprises a second lower link 40 with a horizontal link shaft 41 about which a pivoting arm 42 is pivotally mounted in vertical direction. On the outer end of the pivo¬ ting arm 42 there is provided an outer link means 43, through a lower link 44, in such a way that said outer link means can pivot in vertical direction relative to the pivoting arm 42 about a horizontal shaft 45. The intermediate link means 34 also comprises a second upper link 46 wherein, about a horizontal link shaft 47, a parallel guide bar 48 is pivotally mounted in such manner that said bar can pivot in vertical direction. The outer end of the parallel guide bar 48 is pivotally mounted on an upper link 49 on the outer link means 43 in such a way that said bar can pivot about a horizontal link shaft 50. By means of the pivoting arm 43 and the parallel guide bar 48 a portion P2 of the parallelogram device is obtained, which permits movement of the outer link means 43 with main¬ tained positional orientation relative to the horizontal plane when the second arm 24 is pivoted in vertical direc- tion. An outer arm 51 can be provided on the outer link means 43, said arm being directed obliquely downwards and in an outer end portion 52 provided with a bracket 53 for the hood 5. The passage 4c is connected with the hood 5 and with the gas passage 18 of the link device 2 for conducting or trans¬ porting gases from said hood 5 to said gas passage 18 and therethrough to the fan aggregate 6 or any other evacuating unit. In the embodiment shown, this passage 4c surrounds the various members of the first and second arms 23, 24. The passage 4c is provided in a special way and includes special parts which will be described below. For balancing the exhausting conduit 4 there is provi¬ ded at least one force producing balancing device 54. This device consists of, at the device 1 shown, a first spirally wounded tension spring 55 for balancing the first arm 23 and members supported thereby and a second spirally wounded tension spring 56 for balancing the second arm 24 and mem¬ bers supported thereby. The force producing balancing device 54 cooperates with a compensating device 57 for compensation of differences be- tween the balancing force applied onto the support arm 3 by said balancing device and the force required for balancing said support arm 3. Hereby, it is achieved that the support arm 3 in substantially all of its positions is almost comp¬ letely balanced without using frictional links or without taking other additional measures for that purpose. In the embodiment shown, the compensating device 57 com¬ pensates differences between the force requirement of the parallelogram-device portions PI, P2 and the characteristic of the tension springs 55, 56. Hereby, the compensating device comprises a first compensating means 58 for cooperation with the first tension spring 55 and a second compensating means 59 for cooperation with the tension spring 56. The first com¬ pensating means 58 is mounted on the rear link means 25 and forms a compensating curve 60. The fore part of the tension spring 55 is mounted directs ly or indirectly on the pivoting arm 33 and on the rear part thereof there is provided a flexible fixing means 61, e.g. a steel wire or similar. The flexible fixing means 61 engages the compensating curve 60 and extends from a fix point 62 located such that the flexible fixing means 61 always engages at least rear portions 63 of the compensating curve 60. The fix point 62 can e.g. be located under the compensating curve 60. The compensating curve 60 is formed and located such that the flexible fixing means 61 engages its rear portions when the first arm 23 is in an upwardly pivoted position (see fig. 5, position 66). When the first arm 23 is pivoted or mo¬ ved downwards from this position, the flexible fixing means 61 will roll forward onto the compensating curve 60 more and more, whereby the tension and point of action of the tension spring 55 is altered so that total balancing of the first arm 23 and members provided thereon is achieved in substan¬ tially all positions of said arm 23. In a reversed manner. the flexible fixing means 61 will roll backwards and off the compensating curve 60 more and more when the first arm 23 is pivoted upwards. The compensating curve 60 is preferably convex in shape and eccentric relative to the centre thereof and its rear por¬ tions 63 are preferably located at such a distance behind a vertical plane 67 (see fig. 5) through the horizontal link shaft 30 of the pivoting arm 33 that the flexible fixing means 61 can move inside the passage 4c from positions adja- cent the upper side thereof (see e.g. fig. 4) in a direction downwards in the passage 4c when the first arm 23 is pivoted downwards from an upwardly pivoted position. The fore portions 64 of the compensating curve 60 are preferably located at or adjacent the vertical plane 67 through the horizontal link shaft 30 of the pivoting arm 33, whereby the flexible fixing means 61 will extend in a position 65 (see fig. 5) when the first arm 23 is pivoted downwards to a position 68. The arm 23 can eventually be constructed so that said arm can be pivo¬ ted downwards beyond the vertical plane 67 to a position 68', whereby the flexible fixing means is located in position 65'. The second compensating means 59 of the compensating device 57 preferably has a convex and relative to its centre eccentric shape. The second compensating means 59, its flexi¬ ble fixing means 72 and the second tension spring 56 are also, seen from above, preferably laterally displaced relative to the portion P2 of the parallelogram device in such a way that said flexible fixing means 72 and tension spring 56 can move beside said portion P2 of the parallelogram device, whereby said flexible fixing means 72 may pass beside said portion P2 of said parallelogram device and its links 40, 46 on the rear link means 34 in order to permit downward pivot or movement of the second arm 24 from the upwardly directed position 77 to a downwardly directed position 79 (see fig. 8). Ψhile there is a free space 80 beneath the fore portions 75 of the compensating curve 70, the flexible fixing means 72 may pass freely downwards through said space and e.g. be set in the downwardly directed position 79 without the compensa- ting curve 70 being in the way. In a reversed manner, the flexible fixing means 72 can move upwards beyond the link 41 when the other arm again is pivoted or moved upwards from the position 79. The fore part of the tension spring can be mounted, seen from the side, about in the middle of the passage 4c on an attachment 71 which is provided at the front of the pivoting arm 42. This attachment 71 is adapted to permit fastening of the fore part of the tension spring 56 in such a way that the force producing means 54 does not come in contact with the passage 4c when the arm 24 is moved. Fig. 9 illustrates how the parallel guide bar 37 in the first arm 23, seen from above, is laterally displaced rela¬ tive to the pivoting arm 33. It is also shown that the ten¬ sion spring 55 is placed right above the pivoting arm 33. Fig. 9 further illustrates with dashed and dotted lines that the parallel guide bar 48 in the second arm 24, seen from above, is laterally displaced relative to the pivoting arm 42. It is also shown with dashed and dotted lines that the tension spring 56 is laterally displaced relative to the pivoting arm 42 and furthermore, the parallel guide bar 48 and tension spring 56 are located on both sides of a verti¬ cal centre line through said pivoting arm 42. Hereby, the second arm 24 can without hindrance be pivoted or moved to said downwardly directed position 79 (see fig. 8). On the lower link 44 of the second arm 24 there is provided a fixing means 82 for the outer arm 51 and this fixing means permits pivoting of said outer arm about a vertical axis 83. The outer arm 51 extends obliquely downwards from the fixing means 82 and the bracket 53 is mounted on an outer end por- tion 52 in such manner that said bracket is pivotable about a vertical shaft 84. Since the outer arm 51 and bracket 53 are mounted as described, said bracket and thus, the hood 5 can be swung sideways or laterally relative to the second arm 24. The parallelogram device Pi. P2 ensures that the bracket 53 and thus, the hood 5 maintain a predetermined orientation relative to the horizontal plane when the arms 23 and/or 24 are pivoted or moved vertically. The bracket 53 comprises a member 85 provided on the outer arm 51 and an anchor member 86 for anchording the hood 5. The anchor member 86 is pivotable about a horizontal axis 87 relative to the member 85 mounted on the outer arm 51, whereby the hood 5 when required can be tilted upwards/ /downwards relative to said outer arm 51. The outer arm 51 is preferably not articulated between the vertical axes 83, 84 and the hood 5 is eventually pivo- tally mounted on the anchor member 86 so that it can pivot about a longitudinal axis 88 thereto. The hood 5 comprises a base hood 89 with a recess 90 permitting threading of said base hood 69 onto the anchor member 86 of the bracket 53. The base hood 89 can be snap- ped onto the anchor member 66 or attached thereto in anot¬ her way. The base hood 89 is adapted to define an end ope¬ ning 91 to the passage 4c and it may include a damper 92 for controlling the gasflow therethrough. The base hood 89 is provided with a handle 93 for manoeuvring said base hood and said handle has a space 94 with a lamp 95. Since the lamp 95 is located in the space 94 in the manoeuvring handle 93, it is achieved that said lamp is located beside the gas guiding members of the hood 5. The lamp 95 is adapted to il¬ luminate the work place from which gases shall be sucked and because of its position it is not situated directly in smoke flowing into the hood 5. The base hood 89 may have a square or substantially square cross section and it may be shaped for connection of an extension hose, an extension pipe or any other additio- nal or supplementary unit (not shown). The hood 5 further comprises a flange 96 which can be mounted on the base hood 89 in such a way that is extends outwardly therefrom. For mounting the flange 96 on the base hood 89, said base hood 89 has two elastic or flexible grip portions 97 at outer parts of the end opening 91. The flange 96 has two corresponding hook portions 98, which means that said flange can be snapped onto the base hood 89 by pressing said flange against said base hood such that said hook por¬ tions 98 press the grip portions 97 aside (from position 97A to position 97B in fig. 15) until said hook portions 98 are located behind a grip tongue 99 on said elastic grip por- tions 97. Thereafter, the grip portions 97 can spring back to the position 97A such that the grip tongue 99 retains the hook portions 98 and thus, the flange 96 at the base hood 89. The flange 96 can be released by pressing the grip portions 97 aside from position 97A to position 97B by hand, e.g. with the thumb. The flange 96 preferably has a square circumference, whereby a lower edge 100 is adapted to run in parallel or substantially in parallel with the horizontal plane. Hereby, the lower edge 100 can be placed on a work table so that said lower edge follows said table. Seen from the side, the flange 96 may have a concave front side 101 and from the front it may be somewhat rec¬ tangular and be about twice as wide and high as the base hood 89. In the passage 4c for gas transport there may be inclu¬ ded a flexible hose 102, one end of which is releasably con¬ nected with the passage 18 while the other end is releasably connected with a longitudinal pipe 103 which is mounted on the first arm 23. The hose 102 extends above the lower link 29, the first compensating means 58 of the compensating de¬ vice 57 and the fix point 62 for the flexible fixing means 61. Since the ends of the hose 102 are releaseably connec¬ ted, it is easy to remove said hose for exposing the first compensating means 56 and the fix point 62 without further interference in the passage 4c. To the pipe 103 there is also releaseably connected one end of a flexible hose 104, the other end of which is releaseably connected with a longitu¬ dinal pipe 105 provided on the second arm 24. The hose 104 extends above the intermediate link means 34, the second compensating means 59 of the compensating device 57 and the fix point 73 for the flexible fixing means 72. Since the ends of the hose 104 are releaseably connected, it is easy to remove said hose for exposing the second compensa¬ ting means 59 and the fix point 73 without further interfe¬ rence in the passage 4c. On the pipe 105 there is also re¬ movably provided one end of a hose 106 which is threaded over the outer arm 51 and the other end of which is remov¬ ably connected with the hood 5. The end portions of the flexible hoses 102, 104 and 106 are preferably threaded over the longitudinal pipes 103, 105 and the hood 5 and they are fixed by means of hose locks 107. Each longitudinal pipe 103, 105 preferably has a lower pipe portion 108 and an upper pipe portion 109, which when assembled give the pipe 103, 105 a substantially square cross section with somewhat arcuate sides and corners (see fig. 9). The pipe portions 108, 109 have grooves 110 in a long side and a tongue 111 at the opposite long side and these grooves and tongues are formed such that said pipe portions can be put together by a snap action. The lower pipe portion 108 further comprises an anchoring device 112 for fixing the pipe portion 108 of the pipe 103 on the pivoting arm 33 and the pipe portion 108 of the pipe 105 on the pivo¬ ting arm 42. The anchoring device 112 preferably consists of a snap device having two resilient shanks 113, 114 with in¬ wardly directed tongues 115, 116 and support flanges 117, 118. The lower pipe portion 108 is firmly snapped in posi- tion by threading the anchoring device 112 thereof onto the respective pivoting arm 33 and 42 respectivly, whereby the shanks 113, 114 are brought to spring outwards. When the tongues 115, 116 have passed the respective pivoting arm 33 and 42 respectively, the shanks 113, 114 can spring back inwardly and said tongues lock said anchoring device at the respective pivoting arm. After the snap attachment of the pipe portion 108, the support flanges 117, 118 see to that said pipe portion is locked firmly without play. The pipe portion 108 can be locked in the snap position by means of a lock device 119 which is adapted to prevent the shanks 113, 114 from springing or mo¬ ving outwards. The lock device 119 may comprise a U-shaped member with two shanks 120, 121 which can be inserted into slits or gaps between the resilient shanks 113, 114 of the anchoring device 112 and support flanges 122, 123 on the pipe portion 108 located beside said shanks. The rear link means 25 may be connected directly with the bracket 16 (as in figs. 1 and 10) or indirectly through an extension device preferably comprising at least one beam 124 which may consist of one member (fig. 2) or two members 124a, 124b (fig. 3). In order to connect the beam 124 with the bracket 16 and/or connect the two members 124a, 124b to a beam 124, one can use an interior coupling piece or connector 125 which is designed such that the members to be connected are drawn in a direction towards each other until their edges engage each other with pressure or engage an intermediate portion 126 of said interior connector 125, whereafter said members are held in these positions. In order to provide this function, the interior connec¬ tor 125 may have a pair of apertures or holes 127 and 128, which holes are adapted to receive bolts 129 that are threa¬ ded through holes in one of the members, e.g. the member 124a, to be connected. The interior connector 125 may have a further pair of holes 130 and 131 for bolts 132 which are threaded through holes in the other of said members, e.g. the member 124b, to be connected. By locating one pair of holes 127, 128 at a somewhat lesser distance from the other pair of holes 130, 131 than the distance between corresponding holes in the members to be connected, when said members are brought together as far as possible, said members can be pressed further against each other by means of the bolts 129, 132. By positioning a washer 133 for inward flanging under the head of at least on of the bolts 129 and/or 132, in¬ wardly flanged portions 135 can be provided in the wall 134 of the beam, whereby a firm and effective connection or joint is obtained. A longitudinal pipe 136 (fig. 2) or several longitudinal pipes 136, 137 (fig. 3) of the same type as the longitudinal pipes 103, 105 can be mounted on the beam 124 in order to connect the flexible hose 102 with the passage 18. In order to mount these longitudinal pipes 136, 137 on the beam 124, the anchoring device 112 thereof is used such that between its resilient shanks 113, 114 a fixing unit 138 is provided, which is gripping in under the inwardly directed tongues 115, 116. This fixing unit 138 is attached to the beam 124 by a suitable fastening means 139 so that the anchoring device 112 at the top engages the underside of the beam 124. On the exhaustion and/or supply conduit 4 there may be provided at least one belance-adjusting weight 140 illustra¬ ted with dashed and dotted lines in fig. 9. This balance- -adjusting weight 140 is movable by hand to various posi- tions along the conduit 4 e.g. for adjusting eventual chan¬ ges in weight which might occur after some time due to e.g. fouling of the pipes 103, 105 or for adjusting the force required for manoeuvring said conduit 4. The balance-adjusting weight 140 is -e.g. provided in a cover 141 which is displaceably mounted on the outside of one or more sides of the longitudinal pipe 103 and/or 105. The balance-adjusting weight 140 can e.g. be fixed in the cover 141 by a snap-action. Alternatively, a longitu¬ dinal cover can be provided on the pipe 103 and/or 105 and the balance-adjusting weight 140 provided therein accessible from the outside such that said weight can be displaced in the longitudinal direction of said cover and thus, be set in various positions along the pipe 103 and/or 105. If the conduit members 4a, 4b have parallelogram devi- ces PI, P2, each conduit member may have at least one balance- -adjusting weight 140, whereby each conduit member can be ba¬ lance adjusted separately. The hose locks 107 may consist of a ring 142 (see figs. 20-22) which preferably at two locations is easily bendable to provide hinge-like properties, whereby said ring 142 can be opened for positioning around such part of the conduit 4 wherein the inside of an end portion 145 of the flexible hose 102 and/or 104 and/or 106 engages the outside of an end portion 146 of the pipe 18 and/or 103 and/or 105 and/or eventually the hood 5. The ring 142 comprises a yoke portion 147 and a hook portion 148, whereby the lock portion of said yoke portion 147 consists of an opening or aperture 149 and the lock portion of said hook portion 148 defines a hook 150 which fits into the opening 149 and defines an eccentric lock. The ring 142 further comprises snap portions 151a and 151b for maintaining the yoke and hook portions 147, 148 in engage¬ ment with each other and for preventing, together with mem¬ bers 150 and 149 and guide flanges 152, 153, rotation or distorsion of said yoke and hook portions 147, 148 relative to each other when in engagement. The ring 142 is interiorly adapted to the outer dimen¬ sions of the flexible hose 102, 104, 106 and it has inwardly directed hook portions 154 which are adapted to protrude down between spirals 155, defined by a spiral or helical means 156 forming part of the flexible hose 102, 104, 106, such that said hook portions 154 prevent said hose from sliding relative to the ring 142 when said ring is attached to the pipe 18, 103, 105. This function is made possible or impro¬ ved if the spirals 155 of the hose are not compressible or lack compressible properties. For fastening the ring 142 on the pipe 18, 103, 105, said pipe is provided with an annular groove 157, into which an inwardly directed flange 154a of the ring 142 can be in¬ serted. This flange 154a is retained in the groove 157 when the ring 142 is locked. The end portion 146 of the pipe may taper conically to¬ wards its outer edge 158, whereby connection of the hose is facilitated and the sealing between hose and pipe improved. The end portion 146 may be resilient in radial direc¬ tion, e.g. by providing said end portion with axially exten- ding recesses 159. Furthermore, the end portion 146 may comp¬ rise at least, one radially outwardly directed, resilient hook 160 for facilitating retainment of the hose at the pipe during mounting or connection. The invention is not limited to the embodiments descri¬ bed above and shown in the drawings, but may vary within the scope of the following claims. As examples of not further described or illustrated em¬ bodiments which however still lie within the scope of the claims, one can mention that the adjustable device 1 also or alternatively can be used for supplying air to locations when this is needed; the device 1 may be mounted in other places than a wall; the fan aggregate 6 can be located in another place than shown. The balancing device 54 may be mounted in other ways than shown and consist of other members and the compensa¬ ting device 57 may also be mounted in other ways than il- lustrated and consist of other parts and members than those shown and described. As an example it can be mentioned that the compensating device may have a compensating means which e.g. is similar to the compensating means 58 and placed in a similar way. Above this compensating means there may also extend a flexible fixing means, but one end thereof is not attached to any tension spring but at the front of the arm 23. Thereafter, the fixing means runs backwards over the compensating means and continues downwards behind said means and includes a balancing device in the shape of a weight or spring which is fastened to the lower end thereof. The size of this weight or the spring force is of course estimated for the required balancing. Another example of compensating device is that a compensating means corresponding with the compensating means 58 can be positioned either on any of the pivoting arms or parallel guide bars on condition that said means maintains its orientation relative to the horizon¬ tal plane when the arm in question is moved or pivoted. In order to maintain this orientation, the compensating means can be mounted on a pivoting arm as well as the correspon- ding parallel guide bar. A further example of a compensa¬ ting device is a device having at least one compensating motor. Furthermore, instead of two conduit members 4a, 4b there can be only one conduit member 4a; the passage 4c or similar can be suspended exteriorly on a support arm or similar instead of locating the support arm inside the pas- sage 4c; the conduit device 2 may be of another type and also other members and parts of the device according to the invention, their position and number may vary within the scope of the invention.

Claims: Claims : 1. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri¬ sing at least one exhaustion and/or supply conduit which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54), prefera¬ bly including at least one tension spring (55 and/or 56) is provided for balancing the exhaustion and/or supply con¬ duit (4), c h a r a c t e r i z e d i n that the force- -producing balancing device (54) cooperates with a compensa- ting device (57), preferably including a flexible fixing means (61 or 72) for fixing said force-producing balancing device (54) and preferably including at least one compensa¬ ting means (58 and/or 59) defining at least one compensa¬ ting curve (60 and/or 70), whereby said compensating device is arranged, preferably since the compensating curve (60 and/or 70) has such shape and since the flexible fixing means (61 and/or 72) slides and/or preferably rolls off said curve, such that said compensating device compensates for differences between the balancing force that said force- -producing balancing device (54) exerts on the exhaustion and/or supply conduit (4) and the force required for balan¬ cing said exhaustion and/or supply conduit in substantially all its positions. 2. Adjustable device according to claim 1, whereby the exhaustion and/or supply conduit (4) comprises a first con¬ duit member (4a) which is pivotable in vertical direction and a second conduit member (4b) which is mounted on said first conduit member and also pivotable in vertical direc¬ tion, c h a r a c t e r i z e d i n that the compensa- ting device (57) includes first compensating members (58, 61) for cooperation with such members (55) of the force-producing balancing device (54) which are adapted to balance the first conduit member (4a), and that said compensating device also includes second compensating members (59, 72) for cooperation with such members (56) of said force-producing balancing de- vice which are adapted to balance the second conduit member (4b). 3. Adjustable device according to claim 1 or 2, c h a¬ r a c t e r i z e d i n that the compensating device (57) includes at least one compensating means (58 and/or 59) de¬ fining at least one, relative to its centre preferably ec¬ centric compensating curve (60 and/or 70) and that said com¬ pensating device also includes at least one flexible fixing means (61 and/or 72) through which at least one balancing- -force generating means (55 or 56) in the force-producing balancing device (54) is fixed, whereby said flexible fixing means engages the compensating curve in such a way that said fixing means by sliding or preferably by rolling on and off the compensating curve, is displaced along said curve when the exhaustion and/or supply conduit (4) is pivoted or moved in vertical direction, such that the differences between the balancing force exerted on said exhaustion and/or supply conduit by the balancing-force generating means and the force required for balancing said exhaustion and/or supply conduit is compensated. 4. Adjustable device according to claim 3, c h a ¬ r a c t e r i z e d i n that the compensating curve (60 and/or 70) of the compensating means (58 and/or 59) has such shape, preferably eccentric shape, that the differences be- tween the balancing force exerted on the exhaustion and/or supply conduit (4) by the force-producing balancing device (54) and the force required for balancing said exhaustion and/or supply conduit is compensated by altering the force exerted on said exhaustion and/or supply conduit by the balancing-force generating means (55 and/or 56) as well as its point of action on the compensating curve when the flexible fixing means (61 and/or 72) moves along said com¬ pensating curve. 5. Adjustable device according to claim 3 or 4, c h a- r a c t e r i z e d i n that the compensating means (58 and/or 59) is arranged such that it maintains its positio¬ nal orientation relative to the horizontal plane when the exhaustion and/or supply conduit (4) is pivoted. 6. Adjustable device according to any of claims 3-5, c h a r a c t e r i z e d i n that the compensating means (58 and/or 59) is provided on a link means (25 and/ /or 34) on which the exhaustion and/or supply conduit (4) is pivotally mounted, that the flexible fixing means (61 and/or 72) is fixed on the same link means (25 and/or 34) and that the compensating means (58 and/or 59) and the flexible fixing means (61 and/or 72) are mounted such that said flexible fixing means successively engages ever increa¬ sing parts of the compensating curve (60 and/or 70) of said compensating means in a direction from rear portions of said curve towards fore portions thereof when the exhaustion and/ /or supply conduit (4) is pivoted or moved downwards, while said flexible fixing means successively leaves said compen¬ sating curve in a direction towards its rear portions when said exhaustion and/or supply conduit is pivoted upwards. 7. Adjustable device according to any of claims 3-6, c h a r a c t e r i z e d i n that the compensating means (58 and/or 59) is fixedly provided on a link means (25 and/ /or 34) on which the exhaustion and/or supply conduit (4) is pivotally mounted and that the flexible fixing means (61 and/or 72) extends through rear portions of the compensating curve (60 and/or 70) of said compensating means to a fixed fix point (62 and/or 73) on said link means, whereby said fix point is placed such that said flexible fixing means always engages at least rear portions (63 and/or 74) of said compensating curve. 8. Adjustable device according to any of claims 3-7, c h a r a c t e r i z e d i n that the compensating curve (60 and/or 70) of the compensating means (58 and/or 59) is convex in shape and that fore portions of said compensating curve are situated in or adjacent a vertical plane through a link (29 and/or 35) in which the exhaustion and/or supply conduit (4) is pivotable. 9. Adjustable device according to any of claims 3-8, c h a r a c t e r i z e d i n that the flexible fixing means (61 and'or 72) is connected with the exhaustion and/or supply conduit (4) such that it runs over the compensating curve (60 and/or 70) of the compensating means (58 and/or 59) and that the flexible fixing means is also attached to one end portion of a force-producing balancing device (54) in the shape of at least one spring means (55 and/or 56), the other end portion of which is directly or indirectly connec¬ ted with the exhaustion and/or supply conduit (4) at a dis¬ tance from a link (30 and/or 41) in which said conduit is pivotable in vertical direction. 10. Adjustable device according to any preceding claim, c h a r a c t e r i z e d i n that the compensating de¬ vice (57) or at least members (58, 61 and/or 59, 72) there¬ of are laterally displaced relative to members (33 or PI and/or 42 or P2) forming part of the exhaustion and/or supply conduit (4) such that said compensating device or at least some of the members (61 and/or 72) forming part thereof can move in vertical direction beside said members (33 or PI and/or 42 or P2) forming part of said exhaustion and/or supply conduit when said conduit is pivoted. 11. Adjustable device according to claim 10, c h a ¬ r a c t e r i z e d i n that the compensating device (57) or at least members (58, 61 and/or 59, 72) forming part thereof are laterally displaced relative to at least one link (29 and/or 40) wherein the exhaustion and/or supply con¬ duit (4) is pivotally mounted such that said compensating device or at least any of said members thereof can move in vertical direction beside said link when said exhaustion and/or support conduit is pivoted. 12. Adjustable device according to claim 10 or 11, c h a r a c t e r i z e d i n that at least one flexible fixing means (61 and/or 72) forming part of the compensating device (57), through which means force-producing means (55 and/or 56) forming part of the force-producing balancing means (54) are fixed and which cooperates with at least one compensating means (58 and/or 59) and is laterally displa¬ ced relative to members (33 or PI and/or 42 or P2) forming part of the exhaustion and/or supply conduit (4) and/or re¬ lative to at least one link (29 and/or 40) wherein the ex¬ haustion and/or supply conduit (4) is pivotally mounted, such that the flexible fixing means (61 and/or 72) can move in vertical direction beside at least any of said members of said exhaustion and/or supply conduit and/or said link in which said conduit is pivotally mounted. 13. Adjustable device according to any preceding claim, c h a r a c t e r i z e d i n that at least one balan- cing-force producing means (55 and/or 56) forming part of the force-producing balancing means (54) is laterally displaced relative to members (33 or PI and/or 42 or P2) of the exhaus¬ tion and/or supply conduit (4) such that said balancing-force producing means can be displaced beside said members (33 or PI and/or 42 or P2) of said exhaustion and/or support conduit (4) when said conduit is pivoted. 14. Adjustable device according to any preceding claim, whereby the exhaustion and/or supply conduit (4) comprises a first conduit member (4a) which is pivotable in vertical di- rection and a second conduit member (4b) which is mounted on said first conduit member and also pivotable in vertical direction, c h a r a c t e r i z e d i n that the com¬ pensating device (57) comprises a first compensating means (58) on the first conduit member (4a) and a flexible fixing means (61) engaging a compensating curve (60) on said com¬ pensating means and through which a balancing-force produ¬ cing means (55) for balancing said first conduit member is fixed, and that said compensating device comprises a se¬ cond compensating means (59) for the second conduit me - ber (4b) as well as a flexible fixing means (72) engaging a compensating curve (70) on said second compensating means and through which a balancin -force producing means (56) for balancing said second conduit member is fixed. 15. Adjustable device according to claim 14, c h a - r a c t e r i z e d i n that the first compensating means (58) is mounted on a rear link means (25) on which a link (29) for pivoting the first conduit member (4a) is provided and that the second compensating means (59) is mounted on an intermediate link means (34) which is provided on said first conduit member and on which a link (40) for pivoting the second conduit member (4b) is provided. 16. Adjustable device according to claim 15, c h a ¬ r a c t e r i z e d i n that the flexible fixing means (61) cooperating with the first compensating means (58) is fixedly ly mounted on the rear link means (25) and the flexible fixing means (72) cooperating with the second compensating means (59) is fixedly mounted on the intermediate link means (34). 17. Adjustable device according to any preceding claim, whereby the force-producing balancing device (54) is provi¬ ded inside a passage (4c) forming part of the exhaustion and/or supply conduit (4) for gas transport, c h a r a c - t e r i z e d i n that the compensating device (57) is also mounted inside the passage (4c) for gas transport. 18. Adjustable device according to claim 17, c h a ¬ r a c t e r i z e d i n that at least one compensating means (58 and/or 59) forming part of the compensating de- vice (57) nd a fix point (62 and/or 73) for at least one flexible fixing member (61 and/or 72) which forms part of said compensating device and cooperates with said compensa¬ ting means and which fixes said force-producing compensa¬ ting device, are provided inside partially operable parts or members (102 and/or 104) of the passage (4c) for gas transport for enabling exposure of said compensating means and said fix point by opening said parts without interfe¬ ring with other parts or members of said passage. 19. Adjustable device according to claims 17 and 18, c h a r a c t e r i z e d i n that the compensating de¬ vice (57) is mounted inside the passage (4c) for gas trans¬ port such that at least one flexible fixing means (61 and/ /or 72) forming part thereof and cooperating with at least one compensating means (58 and/or 59) also forming part of said compensating device, can move inside said passage from positions adjacent the upper side of said passage and downwards in said passage when the exhaustion and/or supply conduit (4) or members (4a, 4b) thereof is/are pivoted in downwards direction. 20. Adjustable device according to any preceding claim, whereby the exhaustion and/or supply conduit (4) comprises a support arm (3) which cooperates with the orce-producing balancing device, c h a r a c t e r i z e d i n that the compensating device (57) directly or indirectly coope¬ rates with the support arm (3). 21. Adjustable device according to claim 20, c h a - r a c t e r i z e d i n that the compensating device (57) and support arm (3) are located inside a passage (4c) for gas transport forming part of the exhaustion and supply conduit (4). 22. Adjustable device according to any of claim 20 or 21, c h a r a c t e r i z e d i n that the compensating device (57) or at least members (58, 61 and/or 59, 72) for¬ ming part thereof are laterally displaced relative to the support arm (3) forming part of the exhaustion and/or supp¬ ly conduit (4) or at least relative to members (33 or PI and/or 42 -or P2) thereof such that said compensating device or at least members thereof can move in vertical direction beside said support arm or beside at least members thereof. 23. Adjustable device according to claim 1, whereby the exhaustion and/or supply conduit (4) comprises a sup- port arm (3) including at least one parallelogram device (PI and/or P2) in order to ensure that outer parts or mem¬ bers of said exhaustion and/or supply conduit maintains a predetermined orientation relative to the horizontal plane during pivoting of said conduit and whereby the force-pro- ducing balancing device (54) comprises at least one spring means (55 and/or 56), c h a r a c t e r i z e d i n that the compensating device (57) compensates for differen¬ ces between the force requirement of the parallelogram de¬ vice (PI and/or P2) and the characteristic of the spring means (55 and/or 56). 24. Adjustable device according to claim 23, c h a ¬ r a c t e r i z e d i n that parts (PI) of the parallelo- gram device (PI and/or P2) forming part of the first con¬ duit member (4a) are provided to permit that at least one member (59) of the members (59, 72) of the compensating device (57) which are adapted to cooperate with the second conduit member (4b), maintains a predetermined orientation relative to the horizontal plane when said first conduit member (4a) pivots in vertical direction. 25. Adjustable device according to claim 24, c h a ¬ r a c t e r i z e d i n that the member which by the parts (PI) of the parallelogram device (PI and/or P2) for¬ ming part of the first conduit member (4a) is brought to maintain a predetermined orientation relative to the hori¬ zontal plane when said first conduit member is pivoted in vertical direction, comprises a compensating means (59) with a compensating curve (70) which is engaged by a flexi¬ ble fixing means (72) forming part of the compensating de¬ vice (57). 26. Adjustable device according to any preceding claim, c h a r a c t e r i z e d i n that the members (4a, 4b) of the exhaustion and/or supply conduit (4) which comprise the compensating device (57) are mounted on an outer arm (51) such that sε.id arm is pivotable about a ver¬ tical axis (83), that a bracket (53) for a hood (5) is pro¬ vided on an outer end portion (52) of said outer arm (51) such that said bracket is pivotable about a vertical axis (84) relative to said outer arm, and that the bracket (53) includes an anchor member (86) for the hood (5), which anchor member is connected with a member (85) provided on the outer arm (51) such that said anchor member is pivo- table about a horizontal axis (87) relative to said mem¬ ber (85) on said outer arm (51). 27. Adjustable device according to claim 26, c h a ¬ r a c t e r i z e d i n that the outer arm (51) is in¬ articulate between the vertical axes (83, 84). 28. Adjustable device according to claim 26 or 27, c h a r a c t e r i z e d i n that the hood (5) is pivo¬ tally mounted on the anchor member (86) such that it can pivot about a longitudinal axis (88) thereto. 29. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri¬ sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, where¬ by at least one force-producing balancing device (54) is provided for balancing the exhaustion and/or supply con¬ duit (4), whereby said exhaustion and/or supply conduit comprises at least one passage (4c) for gas transport, which passage includes at least one longitudinal pipe (103 and/or 105), c h a r a c t e r i z e d i n that the longitudinal pipe (103 and/or 105) comprises a lower and an upper pipe portion (108 and 109), whereby this lower and/or upper pipe portion (108 and 109) through an ancho- ring device (112) can be fixed on a pivoting arm (33 and/or 42) forming part of the exhaustion and/or supply conduit (4) in such a way that said pivoting arm is situated inside said longitudinal pipe. 30. Adjustable device according to claim 29, c h a - r a c t e r i z e d i n that at least one of the pipe portions (108 and/or 109) comprises an anchoring device (112), preferably in the shape of a snap device (113, 114) permitting snapping of said pipe portion onto the pivoting arm (33 and/or 42) and that the snap device can be locked by means of a lock device (119) which is adapted to ensure that said snap device maintains its grip on the pivoting arm (33 and/or 42). 31. Adjustable device according to claim 29 or 30, c h a r a c t e r i z e d i n that the anchoring device (112) is mounted on the lower pipe portion (108) such that this pipe portion can be mounted on the pivoting arm (33 and/or 42). 32. Adjustable device according to any of claims 29-31, c h a r a c t e r i z e d i n that the anchoring device (112) is designed such that it also permits mounting of the lower and/or upper pipe portion (108 and/or 109) on an ex¬ tension device, preferably including at least one beam through which at least one pivoting arm (33) can be mounted. 33. Adjustable device according to any of claims 29-32, c h a r a c t e r i z e d i n that the longitudinal pipe (103 and/or 105) has a substantially square cross section, whereby the sides and corners are preferably somewhat ar¬ cuate and that to at least one such longitudinal pipe there is connected a flexible hose (102 and/or 104 and/or 106) with a square cross section and which is threaded onto said longitudinal pipe and fixed thereto through a hose clamp (107). 34. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri¬ sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provi¬ ded for balancing the exhaustion and/or supply conduit (4) and whereby said exhaustion and/or supply conduit includes a hood (5), c h a r a c t e r i z e d i n that the hood (5) comprises a .base hood (89) which is adapted to define an end opening (91) to a passage (4c) for gas transport, which passage forms part of the exhaustion and/or supply conduit (4), and that the hood (5) further comprises a flange (96) which can be mounted on the base hood (89) in such a way that it defines a screen to said base hood. 35. Adjustable device according to claim 34, c h a ¬ r a c t e r i z e d i n that a handle (93) for manoeuv¬ ring the hood (5) is provided on the base hood (89). 36. Adjustable device according to claim 35, c h a ¬ r a c t e r i z e d i n that a lamp (95) is mounted in the manoeuvring handle (93) in such a way that said lamp is situated beside gas guiding members of the hood (5). 37. Adjustable device according to claim 35 or 36, c h a r a c t e r i z e d i n that the base hood (89) has the same or substantially the same cross sectional shape and size as the portions of the passage (4c) for gas transport connected therewith, whereby the cross section of said base hood preferably is square or substantially square. 38. Adjustable device according to any of claims 34-37, c h a r a c t e r i z e d i n that the flange (96) can be snapped onto the base hood (89). 39. Adjustable device according to any of claims 34-38, c h a r a c t e r i z e d i n that the flange (96) has a square circumference, whereby a lower edge (100) is adap¬ ted to run in parallel or substantially in parallel with the horizontal plane. 40. Adjustable device according to any of claims 34-39, c h a r a c t e r i z e d i n that the flange (96) has a somewhat concave front side. 41. Adjustable device according to any of claims 34-40, c h a r a c t e r i z e d i n that the base hood (89) is designed to permit connection of an extension hose or any other extension unit. 42. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) co pri- ' sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provi¬ ded for balancing the exhaustion and/or supply conduit (4) and whereby said conduit includes at least one passage (4c) for gas transport, which passage has at least one longitu¬ dinal pipe, c h a r a c t e r i z e d i n that the lon- gitudinal pipe (136 and/or 137) comprises a lower and an upper pipe portion (108 and 109), whereby this lower and/or upper pipe portion (108 and/or 109) through an anchoring device (112, 138, 139) can be fixed on at least one exten¬ sion device (124) forming part of the exhaustion and/or supply conduit (4) in such a way that said extension device is situated inside said longitudinal pipe. 43. Adjustable device according to claim 42, c h a ¬ r a c t e r i z e d i n that the anchoring device (112, 138, 139) defines a snap device, preferably in the shape of resilient shanks (113, 114) which permit snapping of the pipe portion onto at least one pivoting arm (33 and/or 42) forming part of the exhaustion and/or supply conduit (4). 44. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri¬ sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provided for balancing the exhaustion and/or supply conduit (4) and where¬ by said conduit includes at least one extension device (124), c h a r a c t e r i z e d i n that the extension device (124) is connectable with other members (16) in the exhaus- tion and/or supply conduit (4) and/or with various members (124a, 124b) forming part of said extension device by means of a connector (125) which during mounting permits drawing or pulling of said extension device and said members and/or said various members of said extension device against each other and keeping or holding them in joined positions. 45. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri¬ sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provided for balancing the exhaustion and/or supply conduit (4), c h a ¬ r a c t e r i z e d i n that at least one balancing-adjus¬ ting weight (140) is mounted on the exhaustion and/or supply conduit (4), said weight being manually displaceable along said conduit. 46. Adjustable device according to claim 45, c h a ¬ r a c t e r i z e d i n that the balance-adjusting weight (140) is mounted displaceable in longitudinal direction on the exhaustion and/or supply conduit (4). 47. Adjustable device according to claim 45 or 46, whereby the exhaustion and/or supply conduit (4) includes at least one passage (4c) for gas transport, which gas pas¬ sage comprises at least one longitudinal pipe (103 and/or 105), c h a r a c t e r i z e d i n that the balance- -adjusting weight (140) is provided on the outside of the longitudinal pipe (103 and/or 105) and movable, preferably by displacement in longitudinal direction, to various loca- tions along said longitudinal pipe. 48. Adjustable device according to any of claims 45-47, whereby the exhaustion and/or supply conduit (4) comprises a first and a second conduit member (4a and 4b) which both are pivotable in vertical direction and whereby each con¬ duit member includes at least one parallelogram device (PI, P2) in order to ensure that outer parts of said exhaustion and/or supply conduit maintain a predetermined orientation relative to the horizontal plane during pivoting of said conduit, c h a r a c t e r i z e d i n that each conduit member (4a, 4b) comprises at least one balance-adjusting weight (140). 49. Adjustable device according to any of claims 45-48, c h a r a c t e r i z e d i n that the balance-adjusting weight (140) is provided in a longitudinal cover (141) which is formed integral with or disposable on the exhaustion and/ /or supply conduit (4). 50. Adjustable device for exhaustion and/or supply of gases and gas supported particles, said device (1) compri- sing at least one exhaustion and/or supply conduit (4) which is pivotable in at least vertical direction, whereby at least one force-producing balancing device (54) is provided for balancing the exhaustion and/or supply conduit (4), whereby said conduit includes at least one passage (4c) for gas transport, which passage comprises at least one longitudi¬ nal pipe (103 and/or 105) to which a flexible hose (102 and/or 104 and/or 106) with at least one helical means (156) is connected, said helical means defining spirals (155) in¬ cluded in said flexible hose, c h a r a c t e r i z e d i n that the flexible hose (102 and/or 104 and/or 106) is locked to the longitudinal pipe (103 and/or 105) by means of at least one hose lock (107) having hook portions (154) which are adapted to protrude down between the spirals (155) of the helical means (156) in such a way that said hook portions prevent said flexible hose from sliding rela¬ tive to said hose lock and that the hose lock can be fixed on the longitudinal pipe. 51. Adjustable device according to claim 50, c h a ¬ r a c t e r i z e d i n that the end portion (146) of the pipe (103 and/or 105), at which the flexible hose (102 and/or 104 and/or 106) can be locked by means of the hose lock (107), tapers conically towards its outer edge (158). 52. Adjustable device according to claim 50 or 51, c h a r a c t e r i z e d i n that the end portion (146) of the pipe (103 and/or 105), at which the flexible hose (102 and/or 104 and/or 106) can be locked by means of the hose lock (107), is resilient in radial direction, and that the end portion (146) preferably has an outwardly directed, resilient hook (160) to permit retainment of the flexible hose during mounting. 53. Adjustable device according to any of claims 50-52, c h a r a c t e r i z e d i n that the hose lock (107) has the shape of a ring (142) which can be opened and which in open condition can be put around such an end portion (145) of the flexible hose (102 and/or 104 and/or 106) which is to be locked at the pipe (103 and/or 105), that the ring (142) comprises a yoke portion (147) and a hook portion (148) which can be locked to each other, and that the size of the ring (142) is adapted to the size of the flexible hose. 54. Adjustable device according to claim 53, c h a - r a c t e r i z e d i n that the yoke and hook portions (147, 148) of the ring (142) are provided with at least one lock portion, preferably an eccentric lock portion (150) for locking said yoke and hook portions to each other and that the ring also comprises at least one snap portion (151a, 151b) for keeping the yoke and hook portions (147, 148) in engagement with each other.

Inventors: ENGSTROEM HANS THORBJOERN, ENGSTROEM, HANS, THORBJOERN
Applicants: NEDERMAN PHILIP & CO AB, AB PH. NEDERMAN & CO.
Application year: 1992
Main classification: B08B15
IPC codes: B08B15, F16L3, F24F7