GB2149494A

GB2149494A - Air ventilating duct

Info

Publication number: GB2149494A
Application number: GB08423289A
Authority: GB
Inventors: Roger George Irwin
Original assignee: RYTON S VENTILATION EQUIPMENT
Current assignee: RYTON S VENTILATION EQUIPMENT
Priority date: 1983-11-09
Filing date: 1984-09-14
Publication date: 1985-06-12
Also published as: GB8329875D0; GB8423289D0

Abstract

The duct, for insertion in an aperture (13) in a rendered or cladded wall structure, comprises a tubular body (10) for engagement with the aperture, an apertured cap (12) for insertion into the outer end of the body, and groove formations (18, 19) on the inner surface of the cylindrical body and on an outer surface of the cap to maintain the cap and body in engagement. The duct is held in engagement with the aperture in the wall structure by external ribs (16) on the body, and the bore in the body is tapered and provided with a rib 29 to inhibit the ingress of water when the duct is in position in a wall structure. <IMAGE>

Description

SPECIFICATION Air ventilating duct This invention relates to air ventilating ducts and in particular to a ventilating duct for insertion in a wall in lieu of a conventional air brick.

In British patent number 1274881 there is disclosed and described a ventilating duct adapted for location between adjacent bricks of a wall, the duct comprising a flat sleeve member of elongate generally rectangular transverse cross-section and having a barrier therewithin to inhibit the flow of water therethrough. Such a duct is intended for inclusion in a wall during the construction thereof.

In the case of a cavity wall it is necessary that the vertical joints between the bricks in the inner and outer walls be aligned in order that the duct can be located in the joints. Such joint alignment may be undesirable.

It is an object of the present invention to provide a ventilation duct which may be incorporated in a wall during or after construction thereof or be inserted in an existing wall. It is also an object of the present invention to provide a ventilating duct which does not require alignment of the vertical joints between bricks in the inner and outer walls of a cavity wall. It is a further object of the present invention to provide a ventilating duct which is particularly suitable for incorporation in a wall which is, or which is subsequently to be, cement rendered or clad with some other form of cladding.

The invention provides a ventilation duct comprising a tubular member adapted to be inserted in an aperture in a wall to be retained therein and an apertured cap member engageable with the intended outer end thereof. Preferably the cap member comprises a tubular part and a flange part extending outwardly therefrom, said cap member tubular part and said tubular member being adapted for mutual telescoping engagement and having cooperable formations thereon operable to maintain said telescoping engagement.

Preferably said cap member tubular part is adapted to be inserted within said tubular member with said flange part extending radially outwardly thereof.

Said cooperable formations may comprise at least one circumferentially entending rib on one of said members and as least one circumferentially extending groove on the other of said members.

The or each rib and groove may have a V-shaped cross-section and may have one face thereof extending substantially radially. The or each rib may be provided on said tubular member and the or each groove in said cap member tubular part. The rib or ribs may be provided adjacent one end of said tubular part. A further circumferentially extending rib of substantially rectangular cross-section may be provided internally of said tubular member at a location remote from said one end.

Preferably the outer surface of said tubular member is provided with a plurality of circumferentially extending ribs to facilitate retention of said tubular member within said aperture of a wall. Said outer surface ribs may be of substantially rectangular cross-section.

The outer surface of said tubular member may also be provided with a radially outwardly extending circumferential flange of larger diameter than that of said outer surface ribs.

The tubular member may be circular in crosssection and comprise two C-shaped parts each having at least one formation thereon adapted to cooperate with a corresponding formation on the other C-shaped part to retain said C-shaped parts in mutual engagement.

Said flange part of said cap member may taper radially outwardly. Said cap member may also be provided with a plurality of diametrically extending internal ribs.

The invention will now be described with reference to the accompanying drawing in which: Fig. 1 is a longitudinal section on line I-I of Fig. 2 of one embodiment in situ in a wall but with the cap member disengaged from the tubular member, Fig. 2 is an end view of the cap of Fig. 1; Fig. 3 is a scrap view corresponding to Fig. 1 with the cap member engaged with the tubular member; and Fig. 4 is a view corresponding to Fig. 1 and shows a modified form of tubular member.

Referring now to Figs. 1 to 3 of the drawings, there is shown a ventilating duct 10 comprising a tubular member 11 and a cap member 12. The tubular member 11 is inserted in an aperture 13 in a wall 14.

As shown in Fig. 1, the wall is of single brick or block construction, but it could be the outer wall of a cavity wall construction so that the ventilating duct 10 provides ventilation of the cavity, or is could be a cavity wall construction with the tubular member 11 extending through both walls of the cavity wall to provide ventilation of the room space. The outer surface of the wall 14 is cement rendered or provided with a cladding 15 of some other form.

The tubular member 11 has circumferentially extending ribs 16 on its outer surface to facilitate retention of the tubular member 11 in the aperture 13. An outwardly extending circumferential flange 17 on the tubular member 11 abuts the wall 14 and is covered by the rendering or cladding 15.

Internally of the tubular member 11 is provided a plurality of saw-toothed shaped circumferential ribs 18 which interengagewith correspondingly shaped circumferential grooves 19 provided on the tubular part 20 of cap member 12. Before insertion of the cap member 12 in the tubular member 11 the protruding end 21 of the latter is cut off flush with the rendering or cladding 15, as shown in Fig. 3. The cap member 12 is then inserted into the tubular member 11 until the flange 22 abuts the outer surface 23 of the rendering or cladding 15, or in the case of an un-clad wall the outer surface of the wall itself. Since the flange 22 tapers outwardly a degree of resilience is imparted thereto which allows for an intimate contact between the flange 22 and the cladding 15.This prevents or hinders the ingress of water from the outside of the cap 12 between the flange 22 and the cladding 15 to the interior of the duct 10. A circumferential bead 24 is provided on the cap 12 so that water running down the outside of the upper part of flange 22 will be directed around the outside of the cap 12 to the lower part of flange 22 instead of towards the interior of the cap 12.

The cap 12 is provided with diametrically extending ribs 25 and an annular rib 26 between which apertures 27 provide an inlet or outlet for air to or from the ventilating duct 10.

Any water which does enter the ventilating duct 10 through apertures 27 may be prevented from further ingress towards the inside surface 28 of wall 14firstly by the exposed ribs 18 and finally by the annular internal rib 29 provided in the tubular member 11 adjacent the end thereof remote from the outer end 21. As an additional safeguard against ingress of water through the ventilating duct 10 the aperture 13 through wall 14 may be inclined upwardly towards the inner surface 28, and/or the bore ofthetubular member may taper to provide an upwardly inclined lower surface 31 as shown in Fig.

1. The resilience of flange 22 will accommodate such inclination of the aperture 13 and provide intimate contact between the flange 22 and the outer surface 23 of the cladding 15 or wall 14 as the case may be.

The tubular member 11 is formed of two C-shaped halves, only one being shown in Figs. 1 and 3, which are joined together by means of cooperating spigots and recesses 30.

Although the tubular member 11 may be inserted in the wall after construction thereof, it is preferred that it be inserted during construction. If the aperture 13 is drilled in an existing wall there isa tendency for the inner part of the brick or building block to breakaway under the hammer action of the drill. Such breakage can be made good if the wall is not completed when the aperture 13 is drilled.

In the event that a tubular member 11 is inserted into an aperture 13 in a partly constructed wall, a thin film of a plastics material (not shown) may be provided covering the protruding end 21 to prevent the ingress of dirt, mortar and the like during completion of construction of the wall. Such film will of course be removed when the protruding end 21 is cut off as previously described.

An alternative form of tubular member is shown in Fig. 4, like reference numerals to those of Fig. 1 being used for the same or similar parts.

Thus, referring now to Fig. 4, the intended outer end portion 32 of the tubular member is cylindrical whilst the remaining portion 33 is of truncated conical form and of sensibly constant wall thickness.

The ribs 16 are of increasing radial extent relative to the conical shell which defines region 33 of the tubular member and are of a like outside diameter to those ribs provided on cylindrical end portions 32.

As with the embodiment shown in Fig. so too is the embodiment of Fig. 4 provided with an external flange 17 for abutment with the wall 14 and with internal ribs 18 of saw-tooth form for cooperation with grooves 19 on the tubular part 20 of cap member 12.

Outwardly of the flange 17 the tubular member is provided with a series of external V-shaped grooves 34, the grooves 34 existing in that axial extent of the tubular member within which such member is cut off flush with the outer wall surface 23 and serving to facilitate such operation, whilst the outer end of the member is closed by web 35 to prevent ingress of water or spoil in like manner to the film of plastics material hereinbefore mentioned.

The ventilating duct herein proposed will ordinarily be moulded from a synthetic plastics material, the preferred material of choice being polypropylene, although other materials or a combination of materials may be preferred in some instances.

Claims

1. A ventilation duct comprising a tubular member adapted to be inserted in an aparture in a wall to be retained therein and an apertured cap member engageable with the intended outer end thereof.

2. A ventilation duct as claimed in claim 1, wherein said cap member comprises tubular part and a flange part extending outwardly therefrom, said cap member tubular part and said tubular member being adapted for mutual telescoping engagement and having cooperable formations thereon operable to maintain said telescoping engagement.

3. A ventilation duct as claimed in claim 2, wherein the flange part of the cap member is so dimensioned as to extend radially outwardly of the tubular member on engagement of the cap member therewith.

4. A ventilaton duct as claimed in claim 2 or 3, wherein said cooperable formations comprise at least one circumferentially extending rib on one of said members and at least one circumferentially extending groove on the other of said members.

5. A ventilation duct as claimed in claim 4, wherein the or each rib and groove is of V-shaped cross-section.

6. A ventilation duct as claimed in claim 5, wherein one face of each rib and groove extends substantially radially of the tubular member/cap member.

7. A ventilation duct as claimed in any one of the preceding claims, further including a peripheral flange at the outer surface of the tubular member and in closely spaced disposition relative to the intended outer end thereof, for abutment with a wall surface about the periphery of an aperture therein to limit engagment of the tubular member with such aperture.

8. A ventilation duct as claimed in any one of the preceding claims, wherein the outer surface of the tubular member is provided with a plurality of circumferentially extending ribs to facilitate retention of said tubular member within said aperture of the wall.

9. A ventilataion duct as claimed in claim 8, wherein the circumferentially extending ribs are of cylindrical peripheral configuration and of like outside dimension.

10. A ventilation duct as claimed in any one of the preceding claims, wherein the tubular member has a tapered bore thereto in spaced disposition relative to the intended outer end thereof.

11. A ventilation duct as claimed in claim 10, wherein the tubular member is of sensibly constant wall thickness

12. A ventilation duct as claimed in any one of the preceding claims, further including a series of grooves in the outer surface of the tubular member and adjacent the intended outer end thereof, said grooves materially reducing the wall thickness and facilitating severance of an end region thereof.

13. A ventilation duct as claimed in any one of the preceding claims, wherein the tubular member is an assembly of two C-shaped parts having respective cooperating formations thereon to retain said parts in mutual engagment.

14. A ventilation duct as claimed in any one of the preceding claims, further including a web extending across the intended outer end thereof.

15. A ventilation duct as claimed in claim 14, wherein the said web is formed integrally with the tubular member or elements thereof.

16. A ventilation duct as claimed in claim 2 or any one of claims 3 to 15 when dependent thereon, wherein the flange part of the cap member tapers towards the periphery thereof.

17. A ventilation duct as claimed in any one of the preceding claims, wherein the cap member includes a plurality of diametrically extending internal ribs.

18. A ventilation duct as claimed in any one of the preceding claims, wherein the cap member includes a bead on the outer end face thereof about the periphery of the through bore thereto.

19. A ventilation duct substantially as hereinbefore described with reference to and as illustrated in Figs. 1 to 3 of the accompanying drawings or as modified in accordance with Fig. 4 thereof.