ARRANGEMENT FOR MOUNTING A TUBE OR MEMBER PROVIDED WITH A FLANGE

Abstract: An arrangement for mounting a tube (4) provided with a flange in a hole (3) formed in a wall (2) comprises a locking ring (8) with at least three peripherally spaced apart seats (10) adapted to cooperate with a corresponding number of pins (9) which are fixed to the wall and which each have an oblique surface against which a cam surface (13) provided adjacent to the seat (10) on the periphery of the locking ring is arranged to be applied so that, when the locking ring is turned, the locking ring is urged against the wall in order to compress an elastic sealing ring (7) provided between the locking ring and the wall.

Description: ARRANGEMENT FOR MOUNTING A TUBE OR MEMBER PROVIDED WITH A FLANGE Field of the invention The present invention relates to an arrangement fo mounting a tube or member provided with a flange in a h formed in a wall, said arrangement comprising a locking element with at least three peripherally spaced apart seats or shoulders adapted to cooperate with a corre¬ sponding number of abutment members which are fixed to wall and which each have an oblique surface against whi portions of the locking element can be applied so that, when said locking element is turned, both the locking element and the tube flange are urged inwardly against wall in order to fix said tube flange. NO 152,282 discloses an arrangement of this type i which the abutment members are portions of a ring fixed the wall, said portions defining slits which form bayon catches and which are adapted to receive shoulders in t form of projecting fingers on the turnable locking ele¬ ment. Forming these slits in the ring is, however, both complicated and expensive, which renders the entire arrangement costly to manufacture. Summary of the invention The present invention aims at obviating the above inconveniences in providing an arrangement which is sim and inexpensive to manufacture and which permits rapid expedient mounting and dismounting of the tube. Accordi to the invention, this is achieved by means of an arran ment which is characterised in that a cam surface is pr vided adjacent to each seat or shoulder, and that each abutment member is a pin with a conical portion forming said oblique surface and tapering towards the wall to which said pin is fixed and against which the cam surfa is applied until said pin engages the seat. Brief description of the drawings In the drawings, Fig. 1 is an exploded view showing a filter tube in the process of being mounted in the housing of a dus separator by means of the arrangement according the invention, Fig. 2 is an enlarged front view of a locking element according to the invention, Fig. 3 is a partial cross-section of a portion of the locking element and of the filter tuber in mount position, Fig. 4 is a front view of a tool used for turning the locking element, and Fig. 5 is a part sectional side view of the tool in Fig 4. Description of a preferred embodiment In Fig. 1, the housing 1 of a dust separator has a vertical front wall 2 with a number of holes 3 each adap ted to receive a filter tube 4. For the sake of simpli- city, only two holes are shown in Fig. 1, but in actual practice, the number of holes is usually much larger, e. eight, sixteen, etc. Advantageously, the filter tube 4 i of the type described in, for instance, PCT/SE83/00428, which has an annular flange 6, e.g. of sheet metal, ad- jacent to an opening 5 in one end of said tube. To provi satisfactory sealing between the flange 6 and the front wall 2, a sealing ring 7 of elastic material, e.g. rubbe is passed onto the filter tube to be located between the flange and the front wall when the filter tube is intro- duced in its entirety into the housing. A locking element in the form of a ring 8 adapted t lock the filter tube 4 cooperates with at least three abutment members 9 on the front wall 2. The locking ring 8, which advantageously is made by punching of a metal plate, has a number of peripherally spaced apart seats 1 in this case three seats, the distance between said seat corresponding to the distance between the abutment membe 9. As is best shown in Fig. 3, the abutment member 9 is a pin whose one end is fixed to the front wall 2 and whose opposite end has a head 11, a conical portion 12 being arranged adjacent to said head and converging towards the wall 2. The seats 10 of the locking ring 8 (see Fig. 2) may advantageously consist of V-shaped cuts in the peri¬ phery of the disc-shaped ring. The periphery of said ring is mainly circular, but a cam surface 13, e.g. in the form of a straight portion, as opposed to the remaining cir- cular periphery, is provided before the seat 10. Further¬ more, a recess 14, which in this case is rectangular, is provided in the area behind the seat 10. In actual prac¬ tice, both the seats 10 and the recesses 14 (as well as the pins 9 ) may advantageously be equidistantly spaced apart, in this case with a circular pitch of 120°. Figs 4 and 5 are enlarged views showing a tool 15 for turning the locking ring 8. The tool comprises a base plate, e.g. an annular plate 16, formed along its peri¬ phery with projections 17 whose shape and positon corre- spond to the shape and position of the recesses 14. In actual practice, the projections 17 may be short pieces of square rods welded to the annular plate 16. A grip portion 18 in the form of a U-shaped tube is also, at its opposite ends, welded to the annular plate 16. The above arrangement functions in the following manner. When the filter tube 4 is to be mounted, the elastic sealing ring 7 is slipped over the tube, and the locking ring 8 is fitted on the tool 15. The tube is pushed into the housing 1 with the sealing ring 7 placed in the space between the housing front wall 2 and the flange 6. The locking ring 8 is applied against the outer face of said flange and, while approaching the wall, is held in such a manner that each of the locking pins 9 will be located somewhere in the area between the cam surface 13 and the recess 14 immediately before. When the locking ring 8 has entered a plane immediately behind the heads 11 of the pins, it is turned by means of the tool 15 (clockwise in Fig. 2) such that the cam surfaces 13 will engage the conical surfaces 12 of the pins 9. As the cam surfaces 13 go past the three pins 9, the locking ring is gradually pressed against the wall 2, the sealing ring 7 being compressed correspondingly, until the pins finally engage the seats 10 in the locking ring. Thus, the sealin ring will be permanently compressed under a pressure which, because of the pins 9 which are at least three, will be uniformly distributed along the entire ring, such that the sealing action of the sealing ring will be main¬ tained also if the filter tube projecting into the housin 1 is subjected to a certain torque in consequence of its own weight. It should be observed that, in the assembled state, only the conical portion 12 of the pin 9. is in contact with the V-shaped seat 10, whereas the more slender shank portion of said pin has such a small diameter that it can never contact the portions of the locking ring surroundin the seat. When the filter tube is dismounted, it is there fore easy to release the locking ring by briefly pressing it against the wall and simultaneously turning it by mean of the tool 15 to a position in which the locking pins ar situated along the circular circumferential portions be¬ tween the cam surfaces and the recesses 14 immediately before. Thus, with the arrangement according the invention, filter tubes of the above-mentioned type can be mounted i an extremely rapid and expedient manner ensuring a totall reliable sealing action between the flange of the tube an the housing of the dust separator unit. It goes without saying that the invention is not restricted to the embodiment described above and shown in the drawings. For example, the invention may be applied t flanged tubes or memers other than filter tubes, e.g. an inspection lid in the form of a transparent plate of glas or plastic, which, by means of the locking ring, is pressed against a sealing ring around the hole at issue. The invention can also be used with members which have no openings at the mounting end and in which the ring-shaped locking member 8 could be replaced by a plate without holes. Furthermore, the tool for turning the locking plate can be modified in many ways, e.g. by making the pro¬ jections on the tool engage with holes in the locking plate proper instead of recesses on the plate periphery. Finally, it should be pointed out that the term "wall", as used in the specification and the claim, should be inter- preted in the widest possible sense to comprise, for in¬ stance, also flat rings formed with holes and mounted on a wall or the like.

Claims: CLAIM An arrangement for mounting a tube or member (4) provided with a flange (6) in a hole (3) formed in a wall (2) , comprising a locking element (8) with at least three peripherally spaced apart seats or shoulders (10) adapted to cooperate with a corresponding number of abutment mem¬ bers (9) which are fixed to the wall (2) and which each have an oblique surface (12) against which portions of th locking element can be applied so that, when said locking element is turned, both the locking element and the tube flange ( 6) are urged inwardly against the wall in order t fix said tube flange, c h a r a c t e r i s e d in that a cam surface (13) is provided adjacent to each seat or shoulder (10), and that each abutment member is a pin (9) with a conical portion (12) forming said oblique surface and tapering towards the wall (2) to which said pin is fixed and against which the cam surface ( 13) is applied until said pin engages the seat (10) . .

Inventors: KRANTZ ANDERS, KRANTZ, ANDERS
Applicants: SOEDERHAMN ARCHITECT AB, AIRCHITECT I SOEDERHAMN AB
Application year: 1990
Main classification: F16L5
IPC codes: B01D46, F16L37