Classifications

• • 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
  • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area

Definitions

• the present invention relates to an extraction hood and a method of assembling such an extraction hood.
• extraction hoods have the shape of either a funnel hood or a flange hood.
• the funnel hood is in its simplest form a thin-wall funnel with a first upper connecting end having a smaller diameter for connecting the hood to a suction source and a second lower suction end having a greater diameter which is intended to be directed towards the contamina- tion source.
• the funnel hood has met with broad acceptance due its simplicity but suffers from some deficiencies.
• the funnel hood having a great diameter at its lower end, the entrance speed of the air in the opening plane of the funnel hood will be lower, which affects the suction capacity.
• eddying occurs around the peripheral edge in the opening plane of the hood, deteriorating what is referred to as the capture length since the entrance speed will be lower. Eddying causes a reduc- r
• the flange hood consists of a connection end to be connected
• the extraction end comprises a substantially flat radial flange which surrounds a central opening in the hood.
• the purpose of the flange is to reduce eddying. Due to the
• the capture length increases, which in turn implies that the flange hood can be used at a greater distance from the contamination source, compared with a funnel hood.
• damper is introduced through an end of the hood. Since the available work space inside the hood is very limited, such mounting will be difficult. In this position, the damper is provided with a pivot pin that is mounted from the outside through said holes. Finally the pivot pin is
• the object of the present invention is to provide an extraction hood which allows simple assembly, whether it comprises a damper or not.
• Another object of the present invention is to provide an ergonomically designed extraction hood. Yet another object of the invention is to provide an extraction hood which allows good production economy and which allows easy production.
• An additional object is to provide an extraction hood which ensures a high suction capacity.
• the present invention relates to an extraction hood having the features defined in claim 1.
• the invention also concerns, according to claim 16, a method of assembling an extraction hood.
• the invention relates to an extraction hood which is characterised by a first module comprising a pipe having a first and a second end portion, and a second module comprising a connecting pipe and a cover, said cover connecting to the connecting pipe in such a manner that the connecting pipe comprises a first end portion which is located outside the cover and a second end portion which is located inside the cover, the second end portion of the connecting pipe connecting to the second end portion of the pipe of the first module, and the cover connecting to the first module in the first end portion of the pipe of the first module.
• the inventive extraction hood provides a double-wall structure which has high torsional rigidity.
• an interior space is defined between the cover, the connecting pipe and the pipe of the first module, which space can be used to integrate, for example, a light and associated wiring.
• capture length is meant the distance between the opening plane of the hood and the flow contour which has the minimum air velocity that is required for effective capture.
• the hood can operate with lower air flows with maintained capture length.
• High flows of air are associated with high costs regarding, for example, dimensioning of fans and duct systems, filter dimensioning and also frequency of filter exchange.
• a reduced fre- quency of filter exchange also results in less production stoppages.
• the inventive extraction hood thus offers a number of economic advantages .
• the extraction hood is very easy to manufacture since the two modules can be made each separately by, for example, injection moulding.
• the modules can further be designed in such a manner that, for example, guide means, handles, support surfaces, fastening means and capture means can be integrated into the respective modules and thus be moulded in the injection moulds that are used for the respective modules. This means that the invention allows good production economy.
• the two modules can be designed in such a manner that all mounting, including the possible mounting of damper and light, can take place in one and the same mounting direction. This is made possible by putting the two modules together, while at the same time addi- tional functions, such as damper and light, can be mounted.
• the second end portions of the connecting pipe and the pipe, respectively, can connect to each other, end face to end face. This is advantageous since it results in very simple mounting since the two modules can be put together without overlap or loose connecting means. Furthermore, any injection moulds that are used for the two modules, if injection-moulded, are simplified.
• the first end portion of the pipe of the first module may comprise a radially projecting flange to which the hood connects.
• a flange reduces or may even eliminate the eddying which normally occurs around the opening of extraction hoods, in particular funnel hoods. As stated above, this reduced eddying results in a longer capture length and the advantages associated therewith.
• the flange can also be used to provide an attachment surface for, for example, a glass cover for a light which optionally is arranged in the double-wall construction of the hood.
• the radial flange may form a mounting plate for assembling the first and the second module.
• the first and the second module may define a space between the pipe of the first module and the cover and connecting pipe of the second module.
• This space allows additional functions in the form of, for instance, a light and associated wiring to be integrated into this space. Such additional functions thus need not be arranged in the airflow through the extraction hood and are by their position protected from oil film for instance.
• a damper can be arranged in a connecting portion between the second end portion of the connecting pipe and the second end portion of the pipe of the first module.
• a damper which is arranged in this position allows very smooth assembly of the extraction hood since the modules and the damper can be mounted in one and the same mounting direction and the damper is supported during mounting by one of the two modules.
• By arranging the damper between the two modules it can be kept in place in the connecting portion by the second end portions of the pipe and the connecting pipe, respectively, being put together, after which the two modules are assembled by the lower ends of the cover being connected to the first end portion of the pipe or alternatively a radial flange arranged on this end portion.
• the three parts can thus be assembled by means of a single joint.
• the second end portion of the pipe of the first module may comprise suspension means for said damper.
• the second module may comprise a guide means to allow actuation of said damper by cooperation with an actuating means, which actuating means is arranged on the outside of the second module.
• the guide means and the actuating means may comprise complementary cam curves.
• the actuating means may consist of a knob for instance.
• the connecting pipe may in its first end portion comprise a fastening means for direct or indirect connection of the extraction hood to a suction source.
• the fastening means may be eccentrically arranged relative to the centre axis of the connecting pipe. An eccentric position may result in a smaller lever when the extraction hood is to be handled in a state in which it is connected to a suction source.
• the connecting pipe may in its first end portion comprise a capture means.
• the purpose of the capture means is to capture any objects that may unintentionally be sucked up.
• the capture means may with a suitable design add to increased torsional rigidity of the extraction hood.
• the centre axes of the connecting pipe and the pipe of the first module advantageously make an angle.
• the resulting suction field will obtain a corresponding angle relative to the connecting pipe, whereby the extraction hood need not be arranged straight above the contamination source, but it may be arranged with some displacement and/or angling relative to the same.
• the main extension axis of the suction field which substantially coincides with the extension of the pipe of the first module, is thus allowed, depending on angle, flange width and strength of the suction field, to extend beyond the surface of the flange.
• the extraction hood need not be arranged, for instance, straight or almost straight above the contamination source where it is in the way of the user and also restricts visibility. Visibility and accessibility in the work area are two important ergonomic factors.
• the suction field is angled up from the table surface at a corresponding angle, instead of extending substantially parallel to the table surface. This results in effective capture of fumes, for instance, if the fumes are of the type rising upwards, while at the same time the extraction hood is displaced relative to the work area.
• an elliptic opening plane of the hood is obtained if the first end portion of the pipe comprises a flange.
• This elliptic opening plane results, in turn, in a suction field which can be said to be elliptic in cross-section.
• Such an elliptic opening plane allows further displacement of the hood relative to the contamination source.
• the second module may comprise a collar which defines a gap between the cover and the first end portion of the connecting pipe, said gap being adapted to receive an additional fastening means for direct or indirect connection of the extraction hood to a suction source.
• This additional fastening means may be, for example, a hose clamp which is used to connect the extraction hood to a flexible hose which in turn is connected to the suction source. Also parts of the actual connection may be concealed in this gap.
• the extraction hood may advantageously be provided with a spark screen which is adapted to be arranged over the opening plane of the extraction hood.
• the invention relates to a method of assembling an extraction hood, comprising the steps of providing a first module comprising a pipe which has a first and a second end portion, and a second module comprising a connecting pipe and a cover, which cover connects to the connecting pipe in such a manner that the connecting pipe comprises a first end portion which is located outside the cover and a second end por- tion which is located inside the cover, putting the second module together with the first module so that the second end portion of the pipe of the first module connects to the second end portion of the connecting pipe, and joining the first module to the second module by con- necting the cover to the first end portion of the pipe of the first module.
• This method of assembly results in very advantageous assembly in terms of production technology and production economy since the two modules have such a shape that, by way of introduction, they can be made in one piece by injection moulding for example.
• the two modules may further be designed so as to fit together and give a tight mutual connection, without necessitating gaskets and the like.
• the two modules may, for example during injection moulding, be provided with the necessary guide means, thus allowing the two modules to be smoothly put together from one and the same direction and after that be kept in place relative to each other until the two modules have been assembled with the aid of fixing means intended for the purpose.
• assembly requires no fixtures. If the extraction hood has to be disassembled, for instance in cleaning or general maintenance, disassembly will be as smooth as assembly.
• the method comprises the step of arranging a damper in a connecting portion between the second end portion of the pipe of the first module and the second end portion of the connecting pipe.
• the current method allows this damper to be mounted in the same working direction as the one in which the two modules are put together. During assembly, free vision and access to the interior of the extraction hood are obtained, in contrast to prior-art technique. Moreover, the damper is kept in place by means of the two modules without requiring any fixing elements.
• the damper arranged in the extraction hood may easily be provided with an actuating means in the form of a knob for instance.
• an actuating means being arranged on the outside of the second module to allow actuation of said damper, said actuating means cooperating with the damper and a guide means arranged in the second module.
• the second actuating means in the form of, for instance, a knob can be smoothly mounted from the outside of the extraction hood.
• Fig. 1 is a perspective view of the inventive extraction hood seen obliquely from above.
• Fig. 2 is a perspective view of the inventive extraction hood seen obliquely from below.
• Fig. 3 is a perspective view of the first module seen obliquely from above.
• Fig. 4 is a cross-section of the first module.
• Fig. 5 is a perspective view of the second module seen obliquely from above.
• Fig. 6 is a cross-section of the second module.
• Fig. 7 is a perspective view of the damper.
• Fig. 8 is a cross-section of the assembled extraction hood comprising a damper.
• Fig. 9 shows the position of the actuating means relative to the guide means when the damper is in a closed position.
• Fig. 10 shows the position of the actuating means relative to the guide means when the damper is in a half- open position.
• Fig. 11 shows the position of the actuating means relative to the guide means when the damper is in an open position.
• Fig. 12 shows a spark screen seen obliquely from above .
• Fig. 13 shows a spark screen on an extraction hood.
• FIGs 1 and 2 perspective views are shown, seen obliquely from above and seen obliquely from below respectively, of an extraction hood 1, in the following referred to as hood, according to a preferred embodiment of the present invention.
• the terms upper and lower are used throughout the description.
• Upper end relates to the end which is adapted to be connected to a suction source, and lower end means that part of the hood which is adapted to be directed towards the contamination source.
• the hood has a front and a rear end. Front end relates to the end of the hood which is adapted to face the user and vice versa.
• pipe and connecting pipe are used throughout the application. These terms intend to comprise pipes, hoses, channels or other forms of air ducts which may carry an airflow between a first and a second opening of the hood.
• end portion intends to comprise the pipe end of the respective pipes, but also a portion of the inner and outer circumferential surface next to the pipe end. If the pipes overlap each other or are arranged to engage each other by means of an overlapping socket or the like, the term end portion comprises such an overlapping portion.
• the hood comprises on its outside a cover 2, whose lower end 3 is adapted to be directed towards a contamination source, and an upper end 4 which is adapted to be directly or indirectly connected to a suction source.
• the hood 1 is composed of two parts, more specifically a first 5 and a second module 6. With reference to Figs 3 and 4, the first module 5 is shown.
• the module 5 comprises a pipe 7 which in its lower first end portion 8, more specifically pipe end, has a circumferential, substantially flat radial flange 9.
• the radial flange 9 connects to the pipe in a soft radial transition and is adapted to face the contamination source.
• the opening in the first end portion 8 of the pipe forms what is referred to as the opening plane 10 of the hood, which opening plane preferably coincides with the extent of the radial flange 9.
• the radial flange 9 has two main purposes. It should form a flange which reduces or eliminates eddying in and around the opening plane of the hood. It should also form a mounting plate 11 for assembly of the first 5 and the second module 6 to form the hood.
• the radial flange 9 For assembly of the two modules 5, 6 there are, on the inner surface 12 of the radial flange 9, see Fig. 3, a number of fastening means 13 which in the shown embodiment consist of tower-like structures for receiving screws. However, it will be appreciated that also other types of fastening means can be used.
• the radial flange 9 has a substantially elliptic shape with a bevel 14 at the rear edge 15. The purpose of the bevel is that it should be possible to put the hood, in use, for example on a table, resting on this bevelled rear edge and directed towards the contamination source.
• the pipe 7, see Fig. 4 is arranged so that its centre axis Cl makes a non-right angle ⁇ to the plane 16 of the radial flange 9. More specifically, the centre axis Cl of the pipe makes an acute angle ⁇ which opens towards the rear edge 15 of the radial flange 9.
• the pipe can be substantially straight cylindrical. It can also have the shape of a truncated cone with its base facing the radial flange.
• the centre axis Cl of the pipe 7 making an angle ⁇ to the plane 16 of the radial flange 9, the cross-section of the second end portion 17, that is the opening plane 10 of the hood, of the pipe will be elliptic.
• the ellipse is oriented so that its major axis extends between the front and the rear edge of the hood.
• the geometry of the pipe is not limited to the described embodiments and that the pipe, with maintained function of the hood, may have any cross-section in the longitudinal as well as in the transverse direction. It will also be appreciated that the centre axis of the pipe may make a right angle to the plane of the radial flange.
• the second end portion 17 of the pipe 7 there are two opposite suspension means 18, see Figs 3 and 4, in the form of recesses for receiving and bearing a damper and its pivot pins.
• the first end portion 8 further com- prises first 19a and second 19b flange-like support surfaces which are arranged on the inner circumferential surface 20 of the pipe 7.
• the two support surfaces 19a, 19b are arranged on opposite sides of an imagined straight line (not shown) which extends between the two suspension means 18.
• the two support surfaces 19a, 19b are relatively offset along the centre axis Cl of the pipe by a distance corresponding to the thickness of the peripheral edge of the damper which is adapted to be mounted in the suspension means. If the centre axis Cl of the pipe makes an angle ⁇ to the radial flange 9, the two support surfaces 19a, 19b are preferably positioned so that the support surface 19a which is arranged on the rear portion of the inner circumferential surface 20 of the pipe is positioned below the support surface 19b which is arranged on the front portion of the inner circumferential surface of the pipe 7. As a result, the deadweight of the damper will ensure that the damper tightly engages the two support surfaces .
• the second module 6 comprises a connecting pipe 21 which extends through a cover 2 in such a manner that a first end portion 22 is located outside the cover and a second end portion 23 is located inside the cover.
• the connecting pipe is advantageously straight cylindrical.
• the second end portion 23 of the connecting pipe 21 preferably has the same geometry and dimension as the second end portion 19 of the pipe 7 of the first module 5. Moreover the second end portion 23 of the connecting pipe 21 and the second end portion 17 of the pipe 7 of the first module 5 have complementary bevels 24.
• the first end portion 22 of the connecting pipe 21 preferably comprises a capture means 25.
• the capture means 25 has a grid-like structure which serves to capture any objects that may unintentionally be sucked up when using the hood. Due to its design and position, the capture means 25 increases the torsional rigidity of the second module.
• the connecting pipe 21 further comprises a fastening means 26 in its first end portion 22.
• the fastening means 26 is intended to connect the hood directly or indirectly to a suction source.
• the fastening means 26 is advantageously arranged on and integrated with the capture means 25.
• the fastening means 26 is advantageously arranged eccentrically to the centre axis C2 of the con- necting pipe 21, and more specifically displaced towards the front part of the hood.
• the fastening means 26 has the shape of a lug with a through hole for receiving a bolt.
• the fastening means may constitute part of a hinge. It will be appreciated that the fastening means 26 can also be arranged in some other position, for instance at the rear edge of the hood.
• the cover 2 of the second module 6 has on the upper part of its outer circumferential surface a collar 27 which extends circumferentially around a portion of the first end portion 22 of the connecting pipe 21.
• the collar 27 is arranged at a distance from the outer circumfe- rential surface 29 of the connecting pipe 21 to form a circumferential gap 30 between them.
• the gap 30 is adapted to conceal parts of a connection (not shown) to the suction source and fixing means intended therefor.
• the collar 27 has at its rear edge a recess 31.
• the cover 2 has at its lower end 3 a geometry which is complementary to the lower end 23 of the first module 5, see Fig. 4, and more specifically the periphery of its radial flange 9.
• the cover 2 further comprises on its inner circumferential surface 33 fastening means 34 which are complementary to the fastening means 13 on the radial flange 9 of the first module 5.
• the first module may comprise fastening means, for instance, on the first end portion of the pipe, its circumferential surface or on some other suitable surface.
• the cover 2 advantageously comprises a handle 35, see Fig. 5.
• the handle 35 is arranged on the lower front end of the cover 2 and extends at a minor angle to the plane 16 of the radial flange 9. The angle corresponds to the natural angle at which the hand of an individual grasps an object, thereby providing an ergonomic grip.
• the hood may comprise a damper.
• the damper is a part which is separate from the first and the second module.
• the damper 36 is designed as a flat sheet 37 with a geometry corresponding to the internal cross-sectional geometry of the first end portion 8 of the pipe 7 of the first module 5, and with two radially projecting pivot pins 38.
• the pivot pins 38 are centrally arranged in the plane of the sheet 37, which provides a well-balanced damper.
• the pivot pins 38 are advantageously complementary to the suspension means 18 intended for the damper and arranged in the first end portion 8 of the pipe 7 of the first module 5.
• the damper 36 has advantageously a thickness along its peripheral edge 39 which allows it to be received between and engage the two support surfaces 19a and 19b on the inner circumferential surface of said pipe 7.
• the damper 36 is adapted to be arranged so that the two pivot pins 38 rest in said suspension means 18 and so that the peripheral edge 39 of the damper 36 rests held between the two support surfaces 19a, 19b in the first end portion 8, see Fig. 8.
• the two support surfaces 19a, 19b will thus form a sealing plane against the upper and the lower peripheral surface of the damper 36.
• the damper 36 or alternatively the support surfaces 19a and 19b can be provided with a flexible seal.
• the assembly of the hood will in the following be described with reference to Fig. 8.
• the assembly will relate to the case where the hood comprises a damper 36.
• the first module 5 is arranged so that its pipe is directed upwards.
• the damper 36 is arranged in the suspension means 18 in the second end portion 17 of the pipe 7. More specifically, the damper 36 is arranged in such a manner that the pivot pins 38 of the damper are rotatably held and so that the periphery 39 of the damper is held between the two support surfaces 19a, 19b which are arranged on the inner circumferential surface 20 of the pipe 7.
• the second module 6 is arranged on the first module 5 in such a manner that one pivot pin 38 of the damper 36 projects through a hole 40 in the cover 2, which hole is arranged to hold this pivot pin, and so that the damper is held in place in a connecting portion 41 between the second end portion 17 of the pipe 7 of the first module 5 and the second end portion 23 of the connecting pipe 21.
• connecting portion 41 is meant the portion in which the two end portions 17, 23 engage each other. This connecting portion may, as will be appreciated, be arranged in various ways.
• the second end portion 17 of the pipe 7 of the first module 5 has the same cross-sectional geometry as the second end portion 23 of the connecting pipe 21, whereby the end faces 17, 23 of the two end portions will abut tightly against each other to retain the damper 36 arranged between them.
• the two end portions can be provided with a complementary bevel, see Figs 4 and 6.
• the two end portions have such a geometry that one end portion can be slipped onto the other to form an overlapping joint which at the same time holds the damper in place.
• the connecting portion is defined by the overlap of the end portions.
• the two modules will form a uniform tran- sition in their interface 42, see Fig. 8.
• the thus assembled hood has, with the two modules 5, 6, a double-shell structure in which an inner space 43 is defined between the pipe 7 and the radial flange 9 of the first module 2 and the cover 2 and the connecting pipe 21 of the second module 6.
• This double-shell structure provides increased torsional rigidity.
• the inner space can be used to build in, for instance, a light and associated wiring. If the space 43 accommodates a light, the radial flange 9 advantageously comprises an associated glass cover 44, see Figs 2 and 3.
• a control panel (not shown) for the light can advantageously be arranged on the outside of the cover.
• the cover 2 advantageously comprises on its outer circumferential surface 28 a guide means 60 which constitutes part of the actuation of the damper, see Fig. 5.
• the guide means 60 is preferably formed in one piece with the cover 2 and is arranged around the hole 40 in the cover which is adapted to hold one pivot pin of the damper.
• the guide means 60 is formed as a cam curve 61 which is adapted to cooperate with a complementary cam curve on an actuating means which is a knob for instance.
• the actuating means is shown, for example, in Fig. 1, and designated 70.
• the guide means 60 comprises two sections 63 which are mutually offset at an angle.
• Each section 63 comprises a convex, single-curved arcuate curve 64 with a V-shaped recess 65 arranged centrally on the curve.
• Radially outside these two sections 63 there are two indentations 66, 67, which are also angularly offset from each other to form an upper inden- tation 66 and a lower indentation 67.
• Each indentation 66, 67 forms stop means 68 for said actuating means 70.
• the actuating means 70 comprises two cam curves 71 (only one is shown) which are complementary to the cam curves 61 on the guide means 60 of the cover 2.
• Each cam curve 71 of the actuating means 70 thus comprises a concave, single-curved arcuate curve 74 with a centrally arranged V-shaped protrusion 75.
• the two cam curves 71 are interconnected by means of additional concave, single-curved arcuate curves (not shown) . The transitions between these curves occur in outer V-shaped protrusions 76.
• the actuating means 70 has a first and a second wing 77, which wings form gripping surfaces for actuating the damper. The wings are also adapted to engage the stop means 68 of the guide means 60, see Figs 1 and 5, to limit the turning of the actuating means 70.
• the damper 36 is settable in three fixed positions, that is a closed position, a half-open position and an open position.
• the engagement between the guide means 60 and the actuating means 70 in the three positions will in the following be described with reference to Figs 9-11.
• the inventive hood can easily be connected to a suc- tion source (not shown) , either directly or indirectly.
• the connection to the suction source can occur in the fastening means of the second module.
• the connection to the suction source may be concealed in the gap 30 which is formed between the first end portion 22 of the con- necting pipe 21 and the collar 27 formed by the cover, see Fig. 5.
• a fixing means for instance a hose clamp, which is used for the connection, may be concealed.
• the inventive hood may advantageously comprise a spark screen 48, see Figs 12 and 13, to prevent any sparks from being sucked up.
• the spark screen 48 consists of a fine-mesh metal netting 49 which is adapted to be arranged over the opening plane 10 of the hood, see Fig. 13.
• the mounting on the hood takes place with the aid of a fixing means on the spark screen which is adapted to cooperate with an associated fixing means 51 which is arranged on the hood 1.
• the fixing means 51 arranged on the hood 1 is adapt- ed to be arranged in or adjacent to the opening plane 10 of the hood.
• this fixing means 51 consists of a strip 52 of spring steel, or some other equivalent flexible material, which is arranged on two opposite sides of and transversely to the opening plane 10 of the hood.
• the strip 51 is arranged in the form of an arc transversely to the opening plane in such a manner that in a first position A, see Fig. 12, it forms a con- vex arc which bulges from the opening plane, and in a second position B it forms a concave arc which curves in to the opening plane.
• the fixing means 51 arranged on the hood is designed so that it can mesh lockingly with the fixing means 50 of the spark screen.
• the fixing means 50 of the spark screen are shown highly schematically, and it will be appreciated that they can be designed in many different ways.
• the spark screen and its fixing means 50 are moved towards the fixing means 51 arranged on the hood so that the fixing means 50, 51 engage each other.
• a force is applied perpendicular to the surface of the spark screen 48, whereby the fixing means 51 arranged on the hood snaps away from its first bulging position A to its second inwardly curved position B.
• the spark screen 48 is clamped over and curves into the opening plane 10 of the hood and thus is fixedly mounted.
• the spark screen 48 is pulled straight out, whereby the fixing means 51 arranged on the hood snaps back to its bulged position A.
• the fixing means 50 of the spark screen 48 can be released from the fixing means 51 arranged on the hood 1.
• the two modules 5, 6 have such a construction that each of them advantageously is produced by injection moulding in one piece.
• the two modules with- in the scope of the invention may be divided into several parts or be produced in some other way than by injection moulding .
• the first module 5 comprises a radial flange 9 which is used for assembling the first 5 and the second module 6.
• the first module 5 may consist only of its pipe 7, and that the first end portion 8 on this pipe comprises fastening means, with the aid of which the first 5 and the second module 6 can be assembled.
• the radial flange 9 can be arranged on the second module 6, but that this is less advantageous in terms of tool engineering.
• the radial flange 9 can also be designed as a separate part, but this necessitates a completely different construction of fastenings between the two modules .
• the parts included in the hood can be produced in a smooth manner by a composite material being injection moulded. However it will be appreciated that also other methods and materials may be used.

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Citations (5)

• 2005
  • 2005-09-09 SE SE0502007A patent/SE529098C2/sv not_active IP Right Cessation
• 2006
  • 2006-09-06 WO PCT/SE2006/001020 patent/WO2007030064A1/en not_active Ceased

Patent Citations (5)

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