COVERING PANEL FOR ROOFS AND OUTSIDE WALLS OF BUILDINGS

Abstract: A covering panel for roofs and outside walls of buildings with a projecting top (15, 16) along each one of two opposite edges. The free flank (15 c) of one of these tops (15) is provided with a bend (15 d) running continuously in the direction of the top. When two panels (10, 11) overlap each other in such a way that the top (15) having a bend of one panel (10) is positioned over the top (16) of another panel (11), a gap (22) is formed that is open towards the lower panel. This gap has such a large width (b) that no capillary forces can arise in the gap. When the wind is blowing, a depression arises in the gap, and this depression balances or compensates the depression that arises under the panels. Thus, penetration of water between the panels in the overlaps is prevented.

Description: Covering panel for roofs and outside walls of buildings. Technical Field The present invention relates to a covering panel for roofs and outside walls of buildings. The covering pa¬ nel is provided with a projecting top along each one of 5 two opposite edges and can preferably consist of a profiled sheet having e.g. trapezoidal tops. Background Art When covering a roof with pro iled panels , the se¬ parate panels are positioned with the side edges overlapping 10 each other, so that a top of a succeeding panel ±$ positio¬ ned over a top of a preceding panel. However, in this over¬ lap a narrow gap or slot is formed beτween the panels, and when rain is falling, water can penetrate into this gap or slot by capillary sucticn. When the wind is blowing, the 15 penetration of Water increases due to the depression crea¬ ted by the wind under the covering panels. This penetration of water can cause ' serious damage by damp and frequently ne¬ cessitates the provision of a separate layer for protection against leaking water. 20 Attempts have been made to prevent leakage by apply¬ ing the panels as tight as possible against each other in the overlaps. However, it has not been possible to provide water tight overlaps at* a reasonable price due to manufac¬ turing tolerances . It has been proposed to provide conduits 25 for draining the water that may penetrate between the panels in the overlaps, see e.g. SE 381 075. The provision of such conduits, however, will make the manufacturing and mounting of the panels more complicated and, hence, more expensive. It has also been proposed to provide a top with a depressed 3G groove on the outside flank, see e.g. AU 255 251. This groo¬ ve provides a space between the panels in the overlap, where no capillary forces can arise. While this space eliminates the capillary forces along a portion of the overlap, it does not prevent the penetration of water between the panels due 35 to the depression created under the panels, when the wind JR. is blowing. Furthermore, from a manufacturing point ex vie it is difficult to provide a depressed groove on a flank side of a top. Disclosure of Invention The main object of the invention is to provide a co vering panel that efficiently prevents leakage between the panels in the overlaps but nevertheless is simple to manu¬ facture and easy to mount. This object is obtained by gi¬ ving the covering panel the features set forth in the clai Due to the fact that the free flank of one of the two tops provided along two opposite edges cf the panel is provided with a bend running continuously in the direction of the top and directed outwards, an open gap is provided in the overlap in which no capillary forces can arise. Due to the fact that the gap is open downwards towards the pa¬ nel lying underneath, a depression is created in the gap, when the wind is blowing. This depression opposes the de¬ pression created under the panels, so that the water- is efficiently prevented from penetrating between the panels in the overlaps. Because the bend can be provided by a sim le bending operation on the profiled panels , the manu ctu ring of the panels will not beccme more complicated. One embodiment of the covering panel according to the invention will now be described more in detail " below with reference to the accom an y i g drawings. Brief Description of Drawings Figure 1 is a perspective view of portions of two profiled covering panels with overlapping edges. Figure 2 is a cross section on an enlarged scale through the overlap. Best 2*:ode for carrying Cut the Znvention T e covering panels IC,11 in Figure 1 are provided with longitudinal projections or tops which have been as¬ signed reference numerals 12-15 and 15-17, respectively. These tecs have a trapezoidal cross section. Each top com¬ prises a top section, e.g. 13 a, and a fla k 13 b, 13 c cr. eitner s ce or tne too section, acn t.anel s rov ce . one top along each one of two opposite edges. In Figure 1 only portions of the two panels 10, 11 are shown, the outer¬ most top 15 of the first panel 10 overlapping the other outermost top 16 of the second panel 11. The free flank 15 c 5 of the outermost top of the upper panel 10 is provided with a bend 15 d, as more clearly shown in Figure 2. The panels are positioned with a single overlap, i.e. one top of the first panel overlaps one top of the second panel. In Figure 2 the overlapping portions of the panels 10 are shown on an enlarged scale. The top of the lower panel 11 has a plane top section 16 a and plane flanks 16 b, 16 c, the free flank 15 c being provided with a bent edge 13 in the same plane as the bottom portions 19 of the panel lying between the tops. The top of the upper panel 10 has a plane 15 flank 15 b and a plane top portion 15 a and a free flank 15 c. The free flank 15 c does not cover the whole flank 16 b of the lower panel but ends above the middle of the flank 16 b. The distance between the free edge of the outer flank 15 c of the uppertop and the upper level of this top is less than 20 half the height h of the top. The free flank 15 c is provided with a bend 15 d that runs continuously in the longitudinal direction of the top all along the top. This bend includes two parallel folds 20, 21 and is arranged so that the lower portion of the flank of the top is displaced in parallel 25 outwardly in relation to the upper portion of the flank. The bend forms a gap or chamber 22 that is open downwards towards the lower panel and has a width b such that no capillary forces can arise in this gap or chamber. The gap forms a chamber of turbulence in which a depression arises when the C wind is blowing. This depression balances the depression that arises under the panels and, thus, prevents the water from penetrating between the panels and running away under the panels. The turbulence arising in the gap further decrea¬ ses the risk of water penetrating between the panels in the 35 overlap. To obtain the desired funktion of the gap or cham¬ ber, the gap or chamber should have a width of at least u millimetres , preferably at least 5 millimetres, e.g. 5-10 _ne wictn or tne gap rerers to t e perpendi u¬ lar distance between the flanks of the upper and the lower panels. The bend 15 d on the free flank 15 c cf the top of the upper panel 10 is preferably arranged Immediately below the upper level of the top, so that the upper portion of the gap 22 is connected to the air channel 23 formed bet¬ ween the panels 10, 11 at the upper edges of the flanks 15 and 15 d due to the difference between the inner radius and the outer radius of the top bendings. This step urther re- duces the risk of leakage. The distance between the folds 20, 21 can preferably be. S-9 millimetres, and this portion of the bend can form an angle of about -45 with the flank of the top of the lowe panel. The distance from the lower fold 21 to the lower edg of the flank can preferably be about 5 millimetres. While only one embodiment of the covering panel ac¬ cording to the invention has been illustrated and described it is obvious that many variations and modifications are possible within the scope of the invention. The invention i≤ applicable when the panel is provided with two tops, i.e. one top along each one of two opposite edges. ' r.z. design of the panel between these two tops is immaterial for the appl cation of the invention. The tops must not necessarily have a trapezoidal cross section but can alternatively have a wave-like or scuare -cross-section. The ~ z rY m_st not ne- ι- r- xr - %-,_. v_ V _J_^__^ _ _^ _. mi__V_ __.1_. L_:C ; alternatively be provided by - _an I also possible to use a com! . Nor is it necessarv i — -. d -D * **: - ^ *"_=> — : -_ ■ ! _ __ e _ _3 i s a d- ' k i i .. , .ever , t;.≤ is a εoa-ce _ a ceoressic: ...._ _. ^ ; i.7 i * .__._i _ iT * sτ * , . _ _. _ _i.v_. __. lower anel, than illustrated or- =-._. -i - ≤

Claims: Claims 1. Covering panel for roofs and outside walls of buildings, comprising a projecting top (15,15) along each one of two opposite edges, the free flank (15 c) of one cf these tops (15) being provided with a bend (15 d) running continuously 5 in the direction of the top and directed outwardly, so that when two panels (10,11) overlap each other in such a way that the top (15) having a bend of one panel (10) is posi¬ tioned over the other top (16) of another panel (11), a gap (22) is formed which has such a large width (b) that no 10 capillary forces can arise between the walls of the gap, characterized in that the gap (22) is arranged at the free edge of the flank (15 c) and Is open towards the lower panel (11) and in that the free edge of the flank (15 c) is si¬ tuated at a distance below the upper level cf the top that 15 is smaller than the height (h) of the top, so that a depres¬ sion arises in the gap (22)., when the wind is blowing. 2. Covering panel according to claim 1, characterized in that the distance between the free edge of the flank (15 c) and the upper level of the top is less than half the height 20 (h) of the top. 3. Covering panel according to claim 1 or 2 , characterized in that the bend (15 d) is provided Immediatel below the upper level of the top. •■÷. Covering panel according to any of the preceding claims, 25 characterized in that the gap (22) formed by the bend (15 d) has a width (b) of at least 4 millimetres. 5. Covering panel according to claim •+ , characterized in t the width (b) of the gap is 5-10 millimetres. Covering panel according to claim 1, characterized in the gap (22) forms a chamber of turbulence.

Inventors: JOHANSSON BERNT TORSTEN
Applicants: GRAENGES ALUMINIUM AB, JOHANSSON BERNT TORSTEN
Application year: 1982
Main classification: E04D3
IPC codes: E04D3