CA2007990A1 - Manhole closure for insulated sheet metal duct walls - Google Patents
Manhole closure for insulated sheet metal duct wallsInfo
- Publication number
- CA2007990A1 CA2007990A1 CA002007990A CA2007990A CA2007990A1 CA 2007990 A1 CA2007990 A1 CA 2007990A1 CA 002007990 A CA002007990 A CA 002007990A CA 2007990 A CA2007990 A CA 2007990A CA 2007990 A1 CA2007990 A1 CA 2007990A1
- Authority
- CA
- Canada
- Prior art keywords
- cover
- closure according
- metal ring
- inner cover
- manhole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L45/00—Pipe units with cleaning aperture and closure therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Insulating Bodies (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Thermal Insulation (AREA)
- Duct Arrangements (AREA)
- Building Environments (AREA)
- Closures For Containers (AREA)
- Securing Of Glass Panes Or The Like (AREA)
- Details Of Indoor Wiring (AREA)
Abstract
Abstract of the Disclosure A manhole closure with manhole opening and manhole cover for an insulated sheet metal duct wall has a metal ring which extends around the opening at right angles to the duct wall and is designed as a profiled metal band. The metal ring has an essentially U-shaped cross-section, with a central part, a first flank and a second flank, between which the insulation is enclosed. A folded pocket, with which the metal ring is inserted into the cutout of the duct wall, is molded to the first flank. The manhole cover has an inner cover and an outer cover which can be tightened together and which rest with one clamping rim each on the duct wall or metal ring respectively.
Description
200~990 02 This invention relates to a manhole 03 closure for insulated sheet metal duct walls, with a 04 manhole opening and a manhole cover.
05 Sheet metal ducts which are used in air 06 conditioning and ventilation systems are often 07 provided with an insulating layer for thermal 08 insulation and/or soundproofing. This insulating 09 layer can, for example, consist of glass wool that can 10 be applied to the sheet metal wall either from the 11 outside as outer insulation or from the inside as 12 inner insulation. The top side of the insulation is 13 usually protected by a lining, e.g. in the form of 14 aluminum foil. Sheet metal ducts of this type must 15 also have manhole openings for inspection, maintenance 16 of duct components and cleaning purposes which are 17 sealed with manhole doors, covers, lids or the like.
18 In a design as disclosed in Federal 19 Republic of Germany industrial design DE 02 25 276 01, 20 a manhole cover consists of a long, oval outer cover 21 having a clamping rim around its periphery which is 22 connected to an inner cover of the same shape and size 23 via two screw bolts which can be tightened from the 24 outside by screw studs.
If this type of a manhole cover is to be 26 used for an insulated sheet metal duct wall, then, 27 with outer insulation, the inner edge of the 28 insulating layer can be covered and enclosed by a 29 metal ring which is fastened to the outer duct wall by 30 screws or rivets and expands conically outward. To 31 accomplish this, the insulation must be cut out over 32 the whole cover area, as a result of which the entire 33 area including the manhole cover forms a cold bridge.
34 In another embodiment according to the above 35 industrial design, a two-piece metal ring is provided 36 which aligns with the manhole opening and covers the 37 edge of the insulating layer facing the manhole ., . . . . .. ~.. . ..... . .
, ~ .. ~ .
.
02 opening. The outer cover and the inner cover lie 03 directly on the metal ring and/or duct wall. The 04 disadvantage in this case is that, due to the thin 05 duct wall, the metal ring must be fastened to the duct 06 wall with numerous rivets or screws. Moreover, the 07 frame in sheet metal ducts insulated on the inside 08 must, in addition, be sealed with a packing material.
09 It is an object of the invention to improve a manhole closure having a manhole opening and 11 a manhole cover for insulated sheet metal duct walls 12 in such a way that assembly is facilitated and 13 low-cost manufacturing is possible. At the same time, 14 the insulating effectiveness of the manhole closure is to be improved.
16 This object is obtained in accordance with 17 this invention used in a conventional manhole 18 closure. The profiled metal ring according to this 19 invention can be cut to the required length for the cutout of the manhole opening and easily mounted with 21 the folded pocket on the metal rim edge of the 22 cutout. The metal ring has an essentially U-shaped 23 cross-section with a central part, a first flank and a 24 second flank between which the insulation of the duct wall is enclosed. With outer insulation, the metal 26 ring is inserted into the opening with the folded 27 pocket provided on the first flank of the U-section in 28 such a way that the second flank of the u-shaped 29 section surrounds the insulation from the outside.
The same metal ring can be used for inner insulations 31 =I without any modifications. In this case, it is 32 inserted with the folded pocket into the cutout in 33 such a way that the second flank of the U-shaped 34 section surrounds the insulation from the inside.
To seal the manhole opening, the inner 36 cover has, in an advantageous embodiment, a sealing 37 tape which rests on the metal duct walls insulated on 38 the outside. The folded pocket of the metal ring is ~" ' ~ ' ' ''' , 200799~
Ol _ 3 _ 02 preferably measured in such a way that it is covered 03 by the inner cover resting on it and that the sealing 04 tape of the inner cover seals with the sheet metal 05 wall of the duct.
06 In duct walls insulated on the inside, the 07 sealing tape of the inner cover rests on the second 08 flank of the metal ring from the inside of the duct.
09 To improve the seal, a seal can, in addition, be provided in the folded pocket. To accomplish this, a 11 permanent plastic packing material can e.g. be 12 injected into the folded pocket.
13 Preferably, the metal ring has a smaller 14 curvature than the cutout prior to being inserted into the manhole opening. As a result of this, the metal 16 ring is securely fixed in the cutout after insertion 17 due to its inherent tension.
18 In a further advantageous embodiment, the 19 contact point of the two opposite ends of the metal ring can be connected, for example, by a sheet metal 21 strip which can be inserted into slits of the metal 22 band. Moreover, the contact point can be covered by a 23 self-adhesive aluminum strip.
24 In another advantageous embodiment, for particularly high demands on the insulation and seal 26 of the manhole opening, the inner cover can be in two 27 parts, that is, consist of an even cover plate which 28 rests on the sheet metal duct wall and/or the metal 29 ring from the inside and of a profiled intermediate pl~e. The intermediate plate is shaped like a 31 ^I truncated cone and has a bulge in the area of the rim 32 which extends around the opening and protrudes 33 outward. The two parts of the inner cover can be 34 connected with the cover plate by means of screws or rivets at the junction point between the casing of the 36 truncated cone and the bulge. The cover plate is 37 coated with a continuous insulation in direction 38 toward the outside of the duct. The edge of the cover :, . ,~ ~ : . .
, 02 is, preferably, bent slightly outward. This helps to 03 press the seal against the duct wall in an area 04 outside of the metal ring inserted into the opening.
05 Due to the insulation of the cover, which can e.g.
06 consist of polyethylene foam, the heat-absorbing cover 07 inside the duct is termally insulated against the rest 08 of the manhole covers. The protruding edge of the 09 in~ermediate plate of the inner cover ensures that the manhole cover is centered on the inserted metal ring.
11 Its strong profiling gives the entire inner cover 12 stability and ensures that the forces exerted by ;~
13 tightening the outer cover are also transmitted to the 14 sealing rim. The smooth inner side of the cover with the chamfered rim is aerodynamically very advantageous 16 for the flow inside the sheet metal duct.
17 In another advantageous embodiment, inner 18 cover and outer cover are constructed so as to be 19 detachable from one another. Two short screw bolts are provided on the inner cover: the outer cover can 21 be tightened on said bolts with threaded sleeves, 22 which are fixed with screw studs on the outside of the 23 outer cover. In order to enable a particularly simple 24 mounting, several spring clips are fastened to the rim of the inner cover.
26 The inner cover is first of all 27 torsionally inserted into the manhole opening and then 28 turned into its final position. When the handle is 29 pulled outward, the spring clips snap in on the metal ring and thus fix the inner cover to the duct wall.
31 -i After that, the outer cover can be placed onto the 32 .inner cover and fixed by turning the screw studs. It 33 is dismantled in reverse sequence.
34 In this embodiment, an additional insulating layer can be provided in a particularly 36 advantageous manner on the inner wall of the outer 37 cover. Moreover, the screw bolts do not protrude 38 outward from the screw studs since these are fixed ~ '' .
~ i~` 200~990 02 with threaded sleeves on the screw bolts. ~ .
03 The invention is explained in greater 04 detail below, with reference to descriptions of 05 embodiments, and with reference to the drawings, in 06 which:
07 Figure 1 is a partial section of a sheet o8 metal duct wall, insulated on the outside, with a 09 manhole opening and an inserted manhole cover, Figure 2 is a partial section of a sheet 11 metal duct wall, insulated on the inside, with a 12 manhole opening and an inserted manhole cover, 13 Figure 3 is a partial section of a sheet 14 metal duct wall, insulated on the outside, with a manhole opening and an inserted manhole cover 16 according to an alternative embodiment, 17 Figure 4 is a perspective view of the 18 profiled metal ring which is partially inserted into 19 the cutout of the manhole opening, Figure 5 is a perspective view of the 21 metal ring according to Figure 4 connected at the 22 contact point with a sheet metal strip, 23 Figure 6 is a cross-section of the metal 24 band, Figure 6a is a cross-section of the metal 26 band in an alternative embodiment, 27 Figure 7 is a perspective view of the 28 contact point of the metal ring according to Figure 4 29 with adherent aluminum strip, Figure 7a is a section through the metal 31 ring along the line A-A of Figure 7, 32 Figure 8 is a partial section of a sheet 33 metal duct wall, insulated on the outside, with a 34 manhole opening and an inserted manhole cover, according to a further embodiment, and 36 Figure 9 is a partial section of a sheet 37 metal duct wall with a manhole opening and a manhole 38 cover as in section VIII-VIII of Figure 8.
' ~, .
02 A duct wall 16 which is provided with an 03 outer insulation 12 has an oval manhole opening into 04 which, according to Figure 1, a manhole cover having 05 an outer cover 10 and an inner cover 11 is inserted.
06 On the edge of the cutout, insulation 12 is enclosed 07 with a metal ring 23 which is made like a profiled 08 metal band. Metal ring 23 has an essentially U-shaped 09 cross-section with a central part 13, a first Elank 27 and a second flank 15 between which the insulation 12 11 is enclosed. The end of the first flank of the 12 U-shaped metal band is shaped like an S, whereby its 13 end is formed by a U-shaped folded pocket 14. Metal 14 ring 23 is slipped onto the edge of the cutout in the duct wall 16 with the folded pocket 14 in such a way 16 that the edge of the cutout is surrounded by the 17 folded pocket 14 from the inside and from the 18 outside. Advantageously, the metal ring 23 has a 19 somewhat smaller curvature than the cutout prior to being inserted. It is then securely fixed in the 21 cutout after insertion due to its inherent tension.
22 Moreover, it can, according to Figure 5, be secured by 23 a sheet metal strip 51 at the contact point 52 between 24 the two ends. For this reason, two slits 50 each are punched into the central part 13 of metal ring 23 at 26 both ends. Sheet metal strip 51 is inserted into the 27 resultant fishplates. Alternatively or additionally, 28 contact point 52 of metal ring 23 can be pasted over 29 with a self-adhesive aluminum strip 37 in accordance with Figure 7 or 7a.
31 Outer cover 10 and inner cover 11 of the 32 ~ manhole cover have the same shape and size according 33 to Figure 1. Both covers have a clamping rim 26, 28 34 on the outside which extends around its periphery.
Clamping rim 28 of outer cover 10 rests on the second 36 flank 15 of the U-shaped profiled metal ring 23.
37 Clamping rim 26 of inner cover 11 has a sealing tape 38 21 on its side facing the outer cover 10, which can, 01 _ 7 _ 02 for example, be in the form of a self-adhesive foam 03 strip. The sealing tape 21 covers the folded pocket 04 14 of metal ring 23 and sits tightly on the duct wall 05 16 inside the sheet metal duct.
06 A curved section, extending diagonally 07 outward and passing over into an inwardly sunk curved o8 section, adjoins each of the even clamping rims 28, 26 09 of outer cover 10 and inner cover 11. The middle section of outer cover 10 and inner cover 11 is 11 slightly offset outward and contains one screw bolt 18 12 each (only one bolt can be seen in Figure 1 due to the 13 illustration in cross-section through the oval ~anhole 14 cover). The bolt 18 made as a lock nut is fixed with its head 22 to the inner cover 11 and penetrates the 16 outer cover 10 which can be tightened by screw stud 17 20.
18 The shaft of each bolt 18 is surrounded by 19 a cylindrical coil spring 19 which spreads the outer cover 10 and inner cover 11 apart when they are not in 21 a tightened state so as to facilitate insertion of the 22 manhole cover into the manhole opening.
23 For the purposes of insertion, screw stud 24 20 is unscrewed up to stop 17 on the end of bolt 18, whereby inner cover 11 and outer cover 10 are spread 26 apart by spring 19. The oval manhole cover can be 27 placed into the manhole opening after turning with 28 respect to the longitudinal axis. Often a turn of 30 29 is sufficient to accomplish this. After turning back and fitting the inner cover 11 into the oval cutout, 31 the two screw studs 20 are tightened until outer cover 32 ~ 10 rests with its clamping rim 28 on flank 15 of metal 33 ring 23 on the outside and seal 21 on clamping rim 26 34 of the inner cover 11 seals with folded pocket 14 or duct wall 16. -36 ~ As shown in Figure 2, the same metal ring 37 23 can also be used for enclosing the insulation in 38 sheet metal ducts insulated on the inside. The only ,- ^ - ZO()7990 01 - 8 - ;~
02 difference with respect to Figure 1 is that metal ring 03 23 is inserted into the cutout with its folded pocket 04 14 in such a way that the second flank 15 of metal 05 ring 23 surrounds the inner insulation 25 from the o6 inside. The sealing tape 21 of inner cover 11 then 07 lies directly on this flank. Usually, this is 08 sufficient to seal the manhole opening. With 09 particularly high demands on the tightness, an additional seal 29 can be provided in folded pocket 11 14, in accordance with Figure 6a such as by a 12 permanent plastic sealing material which is injected 13 into the folded pocket.
14 Although an additional insulation is not usually required due to the relatively large space 16 between outer cover 10 and inner cover 11, in order to 17 avoid greater heat losses at the manhole cover, a 18 manhole cover constructed according to Figure 3 can be 19 used for particularly exacting requirements. The inner cover 11' is constructed in two parts it ~-21 consists of a profiled intermediate plate 30, in whose 22 central area the two screw bolts 18 are placed in the 23 above described manner, and of a flat cover plate 34 24 which abuts against the inner wall of the sheet metal duct. The intermediate plate 30 of inner cover 11' is 26 shaped like a truncated cone and has, in the 27 peripheral area, an outwardly protruding bulge 31 28 around the cutout of the manhole opening. The 29 intermediate plate 30 is connected with the cover plate 34 by rivets 32, plastic screws or the like at 31 the junction point between the casing of the truncated 32 cone and bulge 31. A continuous insulating layer 33 33 made of an elastic material, e.g. of polyethylene 34 foam, is applied to the outside of cover plate 34.
The rim of cover plate 34 is curved slightly outward 36 which facilitates pressing the seal against duct wall 37 16 in the area outside of folded pocket 14.
38 Possible cross-sectional shapes of the 02 profiled metal ring 23 are shown in Figures 6 and 6a.
03 The metal band has an essentially U-shaped o4 cross-section with a central part 13, a first flank 27 05 and a second flank 15. A U-shaped folded pocket 14 is 06 placed on the first flank 27 in such a way that its 07 free flank points in the same direction as the second 08 flank 15 of the U-shaped profile. According to Figure 09 6, the folded pocket 14 passes over into an opposite U-shaped curve, so that, as a whole, an S-shaped 11 profiling results between central part 13 and first 12 flank 27.
13 In an alternative embodiment according to 14 Figure 6a, a second U-shaped folded pocket 24 of the same shape and size, which points in the same 16 direction and passes directly over into the second 17 flank 15 of the U-shaped profile, can be provided in 18 addition to the U-shaped folded pocket 14 on the end 19 of the first flank 27. In this embodiment, a seal 29 made of a permanent plastic sealing material is, 21 moreover, injected into folded pocket 14 on the first 22 flank to improve the tightness. Similarly, this type 23 of a seal could also be provided in the other 24 embodiment of the metal ring 23 according to Figure 6.
The described arrangement could also be 26 installed in existing sheet metal duct walls without ~:~
27 any difficulty. To accomplish this in a sheet metal 28 duct wall insulated on the outside, the insulation is 29 first of all cut to the desired size and the cutout is then made in the sheet metal duct wall. The metal 31 band, which has a slightly larger bending radius prior 32 to being inserted into the cutout, is then inserted ~ -33 into the cutout with its folded pocket 14 on the first 34 flank 27 of the U-shaped profile. If desired, it can additionally be fixed at the contact point of the two 36 ends by a sheet metal strip and sealed by means of a ~
37 self-adhesive aluminum strip. One must simply take ~ -38 care when inserting the metal band to ensure that the :
01 - 10 - .
02 insulation is neatly enclosed and not damaged. After 03 inserting and fixing the metal band, the manhole 04 opening can be closed with the manhole cover.
05 A further embodiment of the manhole cover 06 is shown in Figures 8 and 9. The cover consists of an 07 inner cover 11" and an outer cover 10", which have 08 essentially the same shape as described above with 09 reference to Figures 1 and 2. In order to be able to insert and/or remove the manhole cover in a 11 particularly simple manner, however, inner cover 11"
12 and outer cover 10" can be completely detached from 13 one another.
14 Two outwardly protruding screw bolts 18", which are shorter than the screw bolts in Figure 1 or 16 2, are fastened to the inner cover 11". A screw stud 17 20" each is held in two bores 83 on the outside of 18 outer cover 10" which are connected with a threaded 19 sleeve 81 on the inside of the outer cover 10".
A U-shaped handle 80 is fastened with its 21 two inwardly bent ends 82 between the two screw bolts 22 18" of the inner cover 11". For fastening purposes, 23 the two ends 82 are each passed through by one screw 24 bolt 18" and fixed by a pressed-on bulge 92 with respect to the head of screw bolt 22 to the inside of 26 inner cover 11". Four spring clips 91 with a U-shaped 27 clamping ring 93 are slipped on the clamping rim 26 of ~ 28 the inner cover 11", which extends around the d~ 29 periphery and is somewhat larger than the cutout of the manhole opening. A circular sealing tape 21 is 31 placed between the clamping rim 26 and duct wall 16.
32 If the manhole opening is to be sealed, ; 33 then the inner cover 11" is first of all torsionally 34 inserted into the opening and then brought into its final position. By pulling the handle 80 outward, the 36 spring clips 91 snap in place and fix the inner cover 37 11" to the duct wall 16. After that, the outer cover ; 38 10" can be placed onto the manhole opening and ., ~-. .~ ,, .. .
Z007~90 02 tightened on the screw bolts 18" by turning the screw 03 studs 20" with the threaded sleeves 81, whereby the 04 sealing tape 21 seals airtight with the duct wall 16.
05 In this embodiment, an additional insulating layer 90 06 can be provided on the inside of the outer cover 10"
07 in order to obtain a particularly good heat 08 insulation. For the sake of clarity, this insulating 09 layer is not shown in Figure 8. Preferably, the metal ring 23' inserted into the manhole opening has the 11 same shape as in Figure 6a, since the metal ring can 12 be easily bent into the oval shape of the manhole 13 opening in this embodiment.
05 Sheet metal ducts which are used in air 06 conditioning and ventilation systems are often 07 provided with an insulating layer for thermal 08 insulation and/or soundproofing. This insulating 09 layer can, for example, consist of glass wool that can 10 be applied to the sheet metal wall either from the 11 outside as outer insulation or from the inside as 12 inner insulation. The top side of the insulation is 13 usually protected by a lining, e.g. in the form of 14 aluminum foil. Sheet metal ducts of this type must 15 also have manhole openings for inspection, maintenance 16 of duct components and cleaning purposes which are 17 sealed with manhole doors, covers, lids or the like.
18 In a design as disclosed in Federal 19 Republic of Germany industrial design DE 02 25 276 01, 20 a manhole cover consists of a long, oval outer cover 21 having a clamping rim around its periphery which is 22 connected to an inner cover of the same shape and size 23 via two screw bolts which can be tightened from the 24 outside by screw studs.
If this type of a manhole cover is to be 26 used for an insulated sheet metal duct wall, then, 27 with outer insulation, the inner edge of the 28 insulating layer can be covered and enclosed by a 29 metal ring which is fastened to the outer duct wall by 30 screws or rivets and expands conically outward. To 31 accomplish this, the insulation must be cut out over 32 the whole cover area, as a result of which the entire 33 area including the manhole cover forms a cold bridge.
34 In another embodiment according to the above 35 industrial design, a two-piece metal ring is provided 36 which aligns with the manhole opening and covers the 37 edge of the insulating layer facing the manhole ., . . . . .. ~.. . ..... . .
, ~ .. ~ .
.
02 opening. The outer cover and the inner cover lie 03 directly on the metal ring and/or duct wall. The 04 disadvantage in this case is that, due to the thin 05 duct wall, the metal ring must be fastened to the duct 06 wall with numerous rivets or screws. Moreover, the 07 frame in sheet metal ducts insulated on the inside 08 must, in addition, be sealed with a packing material.
09 It is an object of the invention to improve a manhole closure having a manhole opening and 11 a manhole cover for insulated sheet metal duct walls 12 in such a way that assembly is facilitated and 13 low-cost manufacturing is possible. At the same time, 14 the insulating effectiveness of the manhole closure is to be improved.
16 This object is obtained in accordance with 17 this invention used in a conventional manhole 18 closure. The profiled metal ring according to this 19 invention can be cut to the required length for the cutout of the manhole opening and easily mounted with 21 the folded pocket on the metal rim edge of the 22 cutout. The metal ring has an essentially U-shaped 23 cross-section with a central part, a first flank and a 24 second flank between which the insulation of the duct wall is enclosed. With outer insulation, the metal 26 ring is inserted into the opening with the folded 27 pocket provided on the first flank of the U-section in 28 such a way that the second flank of the u-shaped 29 section surrounds the insulation from the outside.
The same metal ring can be used for inner insulations 31 =I without any modifications. In this case, it is 32 inserted with the folded pocket into the cutout in 33 such a way that the second flank of the U-shaped 34 section surrounds the insulation from the inside.
To seal the manhole opening, the inner 36 cover has, in an advantageous embodiment, a sealing 37 tape which rests on the metal duct walls insulated on 38 the outside. The folded pocket of the metal ring is ~" ' ~ ' ' ''' , 200799~
Ol _ 3 _ 02 preferably measured in such a way that it is covered 03 by the inner cover resting on it and that the sealing 04 tape of the inner cover seals with the sheet metal 05 wall of the duct.
06 In duct walls insulated on the inside, the 07 sealing tape of the inner cover rests on the second 08 flank of the metal ring from the inside of the duct.
09 To improve the seal, a seal can, in addition, be provided in the folded pocket. To accomplish this, a 11 permanent plastic packing material can e.g. be 12 injected into the folded pocket.
13 Preferably, the metal ring has a smaller 14 curvature than the cutout prior to being inserted into the manhole opening. As a result of this, the metal 16 ring is securely fixed in the cutout after insertion 17 due to its inherent tension.
18 In a further advantageous embodiment, the 19 contact point of the two opposite ends of the metal ring can be connected, for example, by a sheet metal 21 strip which can be inserted into slits of the metal 22 band. Moreover, the contact point can be covered by a 23 self-adhesive aluminum strip.
24 In another advantageous embodiment, for particularly high demands on the insulation and seal 26 of the manhole opening, the inner cover can be in two 27 parts, that is, consist of an even cover plate which 28 rests on the sheet metal duct wall and/or the metal 29 ring from the inside and of a profiled intermediate pl~e. The intermediate plate is shaped like a 31 ^I truncated cone and has a bulge in the area of the rim 32 which extends around the opening and protrudes 33 outward. The two parts of the inner cover can be 34 connected with the cover plate by means of screws or rivets at the junction point between the casing of the 36 truncated cone and the bulge. The cover plate is 37 coated with a continuous insulation in direction 38 toward the outside of the duct. The edge of the cover :, . ,~ ~ : . .
, 02 is, preferably, bent slightly outward. This helps to 03 press the seal against the duct wall in an area 04 outside of the metal ring inserted into the opening.
05 Due to the insulation of the cover, which can e.g.
06 consist of polyethylene foam, the heat-absorbing cover 07 inside the duct is termally insulated against the rest 08 of the manhole covers. The protruding edge of the 09 in~ermediate plate of the inner cover ensures that the manhole cover is centered on the inserted metal ring.
11 Its strong profiling gives the entire inner cover 12 stability and ensures that the forces exerted by ;~
13 tightening the outer cover are also transmitted to the 14 sealing rim. The smooth inner side of the cover with the chamfered rim is aerodynamically very advantageous 16 for the flow inside the sheet metal duct.
17 In another advantageous embodiment, inner 18 cover and outer cover are constructed so as to be 19 detachable from one another. Two short screw bolts are provided on the inner cover: the outer cover can 21 be tightened on said bolts with threaded sleeves, 22 which are fixed with screw studs on the outside of the 23 outer cover. In order to enable a particularly simple 24 mounting, several spring clips are fastened to the rim of the inner cover.
26 The inner cover is first of all 27 torsionally inserted into the manhole opening and then 28 turned into its final position. When the handle is 29 pulled outward, the spring clips snap in on the metal ring and thus fix the inner cover to the duct wall.
31 -i After that, the outer cover can be placed onto the 32 .inner cover and fixed by turning the screw studs. It 33 is dismantled in reverse sequence.
34 In this embodiment, an additional insulating layer can be provided in a particularly 36 advantageous manner on the inner wall of the outer 37 cover. Moreover, the screw bolts do not protrude 38 outward from the screw studs since these are fixed ~ '' .
~ i~` 200~990 02 with threaded sleeves on the screw bolts. ~ .
03 The invention is explained in greater 04 detail below, with reference to descriptions of 05 embodiments, and with reference to the drawings, in 06 which:
07 Figure 1 is a partial section of a sheet o8 metal duct wall, insulated on the outside, with a 09 manhole opening and an inserted manhole cover, Figure 2 is a partial section of a sheet 11 metal duct wall, insulated on the inside, with a 12 manhole opening and an inserted manhole cover, 13 Figure 3 is a partial section of a sheet 14 metal duct wall, insulated on the outside, with a manhole opening and an inserted manhole cover 16 according to an alternative embodiment, 17 Figure 4 is a perspective view of the 18 profiled metal ring which is partially inserted into 19 the cutout of the manhole opening, Figure 5 is a perspective view of the 21 metal ring according to Figure 4 connected at the 22 contact point with a sheet metal strip, 23 Figure 6 is a cross-section of the metal 24 band, Figure 6a is a cross-section of the metal 26 band in an alternative embodiment, 27 Figure 7 is a perspective view of the 28 contact point of the metal ring according to Figure 4 29 with adherent aluminum strip, Figure 7a is a section through the metal 31 ring along the line A-A of Figure 7, 32 Figure 8 is a partial section of a sheet 33 metal duct wall, insulated on the outside, with a 34 manhole opening and an inserted manhole cover, according to a further embodiment, and 36 Figure 9 is a partial section of a sheet 37 metal duct wall with a manhole opening and a manhole 38 cover as in section VIII-VIII of Figure 8.
' ~, .
02 A duct wall 16 which is provided with an 03 outer insulation 12 has an oval manhole opening into 04 which, according to Figure 1, a manhole cover having 05 an outer cover 10 and an inner cover 11 is inserted.
06 On the edge of the cutout, insulation 12 is enclosed 07 with a metal ring 23 which is made like a profiled 08 metal band. Metal ring 23 has an essentially U-shaped 09 cross-section with a central part 13, a first Elank 27 and a second flank 15 between which the insulation 12 11 is enclosed. The end of the first flank of the 12 U-shaped metal band is shaped like an S, whereby its 13 end is formed by a U-shaped folded pocket 14. Metal 14 ring 23 is slipped onto the edge of the cutout in the duct wall 16 with the folded pocket 14 in such a way 16 that the edge of the cutout is surrounded by the 17 folded pocket 14 from the inside and from the 18 outside. Advantageously, the metal ring 23 has a 19 somewhat smaller curvature than the cutout prior to being inserted. It is then securely fixed in the 21 cutout after insertion due to its inherent tension.
22 Moreover, it can, according to Figure 5, be secured by 23 a sheet metal strip 51 at the contact point 52 between 24 the two ends. For this reason, two slits 50 each are punched into the central part 13 of metal ring 23 at 26 both ends. Sheet metal strip 51 is inserted into the 27 resultant fishplates. Alternatively or additionally, 28 contact point 52 of metal ring 23 can be pasted over 29 with a self-adhesive aluminum strip 37 in accordance with Figure 7 or 7a.
31 Outer cover 10 and inner cover 11 of the 32 ~ manhole cover have the same shape and size according 33 to Figure 1. Both covers have a clamping rim 26, 28 34 on the outside which extends around its periphery.
Clamping rim 28 of outer cover 10 rests on the second 36 flank 15 of the U-shaped profiled metal ring 23.
37 Clamping rim 26 of inner cover 11 has a sealing tape 38 21 on its side facing the outer cover 10, which can, 01 _ 7 _ 02 for example, be in the form of a self-adhesive foam 03 strip. The sealing tape 21 covers the folded pocket 04 14 of metal ring 23 and sits tightly on the duct wall 05 16 inside the sheet metal duct.
06 A curved section, extending diagonally 07 outward and passing over into an inwardly sunk curved o8 section, adjoins each of the even clamping rims 28, 26 09 of outer cover 10 and inner cover 11. The middle section of outer cover 10 and inner cover 11 is 11 slightly offset outward and contains one screw bolt 18 12 each (only one bolt can be seen in Figure 1 due to the 13 illustration in cross-section through the oval ~anhole 14 cover). The bolt 18 made as a lock nut is fixed with its head 22 to the inner cover 11 and penetrates the 16 outer cover 10 which can be tightened by screw stud 17 20.
18 The shaft of each bolt 18 is surrounded by 19 a cylindrical coil spring 19 which spreads the outer cover 10 and inner cover 11 apart when they are not in 21 a tightened state so as to facilitate insertion of the 22 manhole cover into the manhole opening.
23 For the purposes of insertion, screw stud 24 20 is unscrewed up to stop 17 on the end of bolt 18, whereby inner cover 11 and outer cover 10 are spread 26 apart by spring 19. The oval manhole cover can be 27 placed into the manhole opening after turning with 28 respect to the longitudinal axis. Often a turn of 30 29 is sufficient to accomplish this. After turning back and fitting the inner cover 11 into the oval cutout, 31 the two screw studs 20 are tightened until outer cover 32 ~ 10 rests with its clamping rim 28 on flank 15 of metal 33 ring 23 on the outside and seal 21 on clamping rim 26 34 of the inner cover 11 seals with folded pocket 14 or duct wall 16. -36 ~ As shown in Figure 2, the same metal ring 37 23 can also be used for enclosing the insulation in 38 sheet metal ducts insulated on the inside. The only ,- ^ - ZO()7990 01 - 8 - ;~
02 difference with respect to Figure 1 is that metal ring 03 23 is inserted into the cutout with its folded pocket 04 14 in such a way that the second flank 15 of metal 05 ring 23 surrounds the inner insulation 25 from the o6 inside. The sealing tape 21 of inner cover 11 then 07 lies directly on this flank. Usually, this is 08 sufficient to seal the manhole opening. With 09 particularly high demands on the tightness, an additional seal 29 can be provided in folded pocket 11 14, in accordance with Figure 6a such as by a 12 permanent plastic sealing material which is injected 13 into the folded pocket.
14 Although an additional insulation is not usually required due to the relatively large space 16 between outer cover 10 and inner cover 11, in order to 17 avoid greater heat losses at the manhole cover, a 18 manhole cover constructed according to Figure 3 can be 19 used for particularly exacting requirements. The inner cover 11' is constructed in two parts it ~-21 consists of a profiled intermediate plate 30, in whose 22 central area the two screw bolts 18 are placed in the 23 above described manner, and of a flat cover plate 34 24 which abuts against the inner wall of the sheet metal duct. The intermediate plate 30 of inner cover 11' is 26 shaped like a truncated cone and has, in the 27 peripheral area, an outwardly protruding bulge 31 28 around the cutout of the manhole opening. The 29 intermediate plate 30 is connected with the cover plate 34 by rivets 32, plastic screws or the like at 31 the junction point between the casing of the truncated 32 cone and bulge 31. A continuous insulating layer 33 33 made of an elastic material, e.g. of polyethylene 34 foam, is applied to the outside of cover plate 34.
The rim of cover plate 34 is curved slightly outward 36 which facilitates pressing the seal against duct wall 37 16 in the area outside of folded pocket 14.
38 Possible cross-sectional shapes of the 02 profiled metal ring 23 are shown in Figures 6 and 6a.
03 The metal band has an essentially U-shaped o4 cross-section with a central part 13, a first flank 27 05 and a second flank 15. A U-shaped folded pocket 14 is 06 placed on the first flank 27 in such a way that its 07 free flank points in the same direction as the second 08 flank 15 of the U-shaped profile. According to Figure 09 6, the folded pocket 14 passes over into an opposite U-shaped curve, so that, as a whole, an S-shaped 11 profiling results between central part 13 and first 12 flank 27.
13 In an alternative embodiment according to 14 Figure 6a, a second U-shaped folded pocket 24 of the same shape and size, which points in the same 16 direction and passes directly over into the second 17 flank 15 of the U-shaped profile, can be provided in 18 addition to the U-shaped folded pocket 14 on the end 19 of the first flank 27. In this embodiment, a seal 29 made of a permanent plastic sealing material is, 21 moreover, injected into folded pocket 14 on the first 22 flank to improve the tightness. Similarly, this type 23 of a seal could also be provided in the other 24 embodiment of the metal ring 23 according to Figure 6.
The described arrangement could also be 26 installed in existing sheet metal duct walls without ~:~
27 any difficulty. To accomplish this in a sheet metal 28 duct wall insulated on the outside, the insulation is 29 first of all cut to the desired size and the cutout is then made in the sheet metal duct wall. The metal 31 band, which has a slightly larger bending radius prior 32 to being inserted into the cutout, is then inserted ~ -33 into the cutout with its folded pocket 14 on the first 34 flank 27 of the U-shaped profile. If desired, it can additionally be fixed at the contact point of the two 36 ends by a sheet metal strip and sealed by means of a ~
37 self-adhesive aluminum strip. One must simply take ~ -38 care when inserting the metal band to ensure that the :
01 - 10 - .
02 insulation is neatly enclosed and not damaged. After 03 inserting and fixing the metal band, the manhole 04 opening can be closed with the manhole cover.
05 A further embodiment of the manhole cover 06 is shown in Figures 8 and 9. The cover consists of an 07 inner cover 11" and an outer cover 10", which have 08 essentially the same shape as described above with 09 reference to Figures 1 and 2. In order to be able to insert and/or remove the manhole cover in a 11 particularly simple manner, however, inner cover 11"
12 and outer cover 10" can be completely detached from 13 one another.
14 Two outwardly protruding screw bolts 18", which are shorter than the screw bolts in Figure 1 or 16 2, are fastened to the inner cover 11". A screw stud 17 20" each is held in two bores 83 on the outside of 18 outer cover 10" which are connected with a threaded 19 sleeve 81 on the inside of the outer cover 10".
A U-shaped handle 80 is fastened with its 21 two inwardly bent ends 82 between the two screw bolts 22 18" of the inner cover 11". For fastening purposes, 23 the two ends 82 are each passed through by one screw 24 bolt 18" and fixed by a pressed-on bulge 92 with respect to the head of screw bolt 22 to the inside of 26 inner cover 11". Four spring clips 91 with a U-shaped 27 clamping ring 93 are slipped on the clamping rim 26 of ~ 28 the inner cover 11", which extends around the d~ 29 periphery and is somewhat larger than the cutout of the manhole opening. A circular sealing tape 21 is 31 placed between the clamping rim 26 and duct wall 16.
32 If the manhole opening is to be sealed, ; 33 then the inner cover 11" is first of all torsionally 34 inserted into the opening and then brought into its final position. By pulling the handle 80 outward, the 36 spring clips 91 snap in place and fix the inner cover 37 11" to the duct wall 16. After that, the outer cover ; 38 10" can be placed onto the manhole opening and ., ~-. .~ ,, .. .
Z007~90 02 tightened on the screw bolts 18" by turning the screw 03 studs 20" with the threaded sleeves 81, whereby the 04 sealing tape 21 seals airtight with the duct wall 16.
05 In this embodiment, an additional insulating layer 90 06 can be provided on the inside of the outer cover 10"
07 in order to obtain a particularly good heat 08 insulation. For the sake of clarity, this insulating 09 layer is not shown in Figure 8. Preferably, the metal ring 23' inserted into the manhole opening has the 11 same shape as in Figure 6a, since the metal ring can 12 be easily bent into the oval shape of the manhole 13 opening in this embodiment.
Claims (27)
1. A manhole closure for an insulated sheet metal duct wall containing a manhole opening and comprising a manhole cover, a metal ring extending around the opening at right angles to the duct wall and having a U-shaped cross-section, a central part, a first flank and a second flank between which insulation is enclosed in the region of the opening, the manhole cover having an inner cover and an outer cover which can be tightened together and whereby both covers have a clamping rim resting on one of the duct wall and the metal ring, a seal being provided on at least one clamping rim, the metal ring being comprised of a profiled metal band, in which a folded pocket is molded to the first flank, the metal ring being slipped onto the opening in the duct wall so that the folded pocket surrounds the metal edge of the opening from the inside and from the outside.
2. A closure as defined in claim 1, in which the metal ring is folded in the shape of an S at its first flank, whereby the end of the S-shaped fold is formed by the folded pocket which points in the same direction as the second flank of the U-shaped profile.
3. A closure according to claim 1, in which the second flank of the metal ring passes over into a U-shaped folded pocket of the same shape and size as the folded pocket on the first flank of the metal ring, whereby both folded pockets point in the same direction.
4. A closure according to claim 1, 2 or 3, in which the inner cover has a sealing tape on the outside of its clamping rim.
5. A closure according to claim 4, in which the sealing tape of the inner cover covers the folded pocket of the metal ring on the inside of the duct and fits tightly on the duct wall.
6. A closure according to claim 4, in which the sealing tape of the inner cover lies on the second flank of the metal ring from the inside of the duct.
7. A closure according to claim 1, 2 or 3, in which a seal is provided in the folded pocket.
8. A closure according to claim 1, 2 or 3, in which the metal ring is fixed in the manhole opening by its inherent tension acting in direction of the rim of the manhole opening.
9. A closure according to claim 1, 2 or 3, in which two opposite ends of the metal ring are connectable at their contact point.
10. A closure according to claim 9, in which the two opposite ends of the metal ring are connectable at their contact point by a metal strip which can be inserted into slits on the central part of the metal ring.
11. A closure according to claim 1, 2 or 3, in which the contact point of two opposite ends of the metal ring is covered by a self-adhesive aluminum strip.
12. A closure according to claim 1, 2 or 3, in which the manhole opening and manhole cover have an elongated oval shape.
13. A closure according to claim 1, in which, on the inner cover, two outwardly pointing screw bolts are provided which penetrate the outer cover, and further comprising screw studs for tightening the screw bolts, and coil springs being provided between outer cover and inner cover for providing tension against the screw bolts.
14. A closure according to claim 13, in which the screw studs are partially received in a depression of the outer cover.
15. A closure according to claim 1, 2 or 3, in which the inner cover and the outer cover have the same shape and size.
16. A closure according to claim 14, in which the inner cover is comprised of a profiled intermediate plate and of a flat cover plate connected to it and which covers the manhole opening on the inside of the duct.
17. A closure according to claim 16, in which the intermediate plate of the inner cover is shaped like a truncated cone and has an outwardly protruding bulge extending around the manhole opening in its peripheral region.
18. A closure according to claim 17, in which the intermediate plate of the inner cover is connected to the cover plate by means of screws or rivets at a junction point between the casing of the truncated cone and the bulge.
19. A closure according to claim 16, 17 or 18, in which an insulating layer is applied to the outside of the cover plate.
20. A closure according to one of claims 16, 17 or 18, in which the cover plate has a rim which is curved in direction of the duct wall.
21. A closure according to one of claims 16, 17 or 18, in which the rim of the cover plate covers the folded pocket of the metal ring and fits tightly on the duct wall.
22. A closure according to one of claims 1 to 12, 14 or 15, in which two outwardly pointing screw bolts are provided on the inner cover on which the outer cover can be tightened by means of threaded sleeves which are fixed with screw studs on the outside of the outer cover, whereby outer and inner cover can be completely detached from one another after loosening the screw connection.
23. A closure according to claim 22, in which an outwardly protruding handle is provided on the inner cover.
24. A closure according to claim 22 or 23, in which the handle is bent into the shape of a U and is secured in position with its two ends together with the screw bolts on the inner cover.
25. A closure according to claim 24, in which the handle is passed through by the screw bolts on its two ends and passed through by the threaded sleeve on its outwardly protruding handle part.
26. A closure according to one of the claims 23 to 25, in which, to assist in assembly, numerous spring clips are fixed on the clamping rim of the inner cover which snap in on the metal ring when the inner cover is pulled outward with help of the handle and fix the inner cover on the metal ring.
27. A closure according to one of the claims 23 to 26, in which an insulating layer is provided on the inside of the outer cover.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3901393A DE3901393C1 (en) | 1989-01-19 | 1989-01-19 | |
| DEP3901393.6-24 | 1989-01-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2007990A1 true CA2007990A1 (en) | 1990-07-19 |
Family
ID=6372340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002007990A Abandoned CA2007990A1 (en) | 1989-01-19 | 1990-01-17 | Manhole closure for insulated sheet metal duct walls |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0379189B1 (en) |
| JP (1) | JPH0350441A (en) |
| AT (1) | ATE81394T1 (en) |
| AU (1) | AU628467B2 (en) |
| CA (1) | CA2007990A1 (en) |
| DD (1) | DD291621A5 (en) |
| DE (2) | DE3901393C1 (en) |
| ES (1) | ES2035653T3 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1018980C2 (en) * | 2001-09-18 | 2003-03-19 | Interactive Bouwprodukten B V | Assembly for sealing openings in an outer tube part and an inner tube part and an inner cover for such an assembly. |
| AT500028B8 (en) * | 2002-05-29 | 2007-02-15 | Poloplast Gmbh & Co Kg | TUBULAR PLASTER FOR PIPING |
| DE10317718B3 (en) * | 2003-04-17 | 2004-11-04 | Metu Meinig Aktiengesellschaft | Inspection closure for an inspection opening of a sheet metal duct |
| NZ546688A (en) * | 2003-09-24 | 2008-05-30 | Mag Solutions Pty Ltd | Means for disenabling the use of a toilet bowl |
| DE102004032554B4 (en) * | 2004-07-06 | 2006-07-13 | Airbus Deutschland Gmbh | Closure for closing a component opening in a component |
| FR3012563B1 (en) * | 2013-10-28 | 2016-05-06 | Xavier Servanin | FIREWALL VISIT HAT FOR CONDUIT |
| JP7071720B2 (en) * | 2017-03-27 | 2022-05-19 | 株式会社フカガワ本社 | Inspection port device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT293805B (en) * | 1969-03-07 | 1971-10-25 | Oesterr Symalen Gmbh | Pipe with cleaning opening and sealing cover |
| GB1557861A (en) * | 1975-07-03 | 1979-12-12 | Hargreaves & Sons Ltd Henry | Access door assemcly for ducting |
| AU526320B2 (en) * | 1979-04-27 | 1983-01-06 | Acme Fluid Foundry Pty. Ltd. | Manway cover fastening assembly |
| DE8225276U1 (en) * | 1982-09-08 | 1982-12-23 | Karl Meinig KG, 7201 Rietheim-Weilheim | Sheet metal duct wall with inspection opening and inspection cover closing the same |
-
1989
- 1989-01-19 DE DE3901393A patent/DE3901393C1/de not_active Expired - Fee Related
-
1990
- 1990-01-17 CA CA002007990A patent/CA2007990A1/en not_active Abandoned
- 1990-01-18 DE DE9090100971T patent/DE59000337D1/en not_active Expired - Fee Related
- 1990-01-18 EP EP90100971A patent/EP0379189B1/en not_active Expired - Lifetime
- 1990-01-18 JP JP2007252A patent/JPH0350441A/en active Pending
- 1990-01-18 AT AT90100971T patent/ATE81394T1/en active
- 1990-01-18 ES ES199090100971T patent/ES2035653T3/en not_active Expired - Lifetime
- 1990-01-19 DD DD90337215A patent/DD291621A5/en not_active IP Right Cessation
- 1990-01-19 AU AU48613/90A patent/AU628467B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE3901393C1 (en) | 1990-06-28 |
| JPH0350441A (en) | 1991-03-05 |
| ES2035653T3 (en) | 1993-04-16 |
| EP0379189B1 (en) | 1992-10-07 |
| DD291621A5 (en) | 1991-07-04 |
| ATE81394T1 (en) | 1992-10-15 |
| EP0379189A1 (en) | 1990-07-25 |
| DE59000337D1 (en) | 1992-11-12 |
| AU628467B2 (en) | 1992-09-17 |
| AU4861390A (en) | 1990-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |