CORNER JOINT

Abstract: A corner joint for a building made of timber elements, the exterior surface of which is a wall construction made of logs (3.1, 3.2), and whose interior surface is a wall construction made of logs (4.1, 4.2), and where in the space between said wall constructions thermal insulation (6) is fitted, whereby both elements end inside the wall construction and the exterior corner, which extends over the wall line of the building, is made of separate corner elements (1, 2) on top of another. Elements (4), which form the interior wall, are placed crosswise in the corner, reach to and end substantially in the elements, which form the exterior wall, and the crosswise stacked corner elements (1, 2) have extensions, which between elements (3, 4) reach over the crosswise interior wall elements (4), while said extensions have an inter-locking shape, such as a notch at the crossing elements.

Description: 1 CORNER JOINT The invention relates to a corner joint, according to the introduction chapter of patent claim 1 , which is used by framework. The corner joint is especially suited for a wall construction built of an exterior wall element, an inner wall element and thermal insulation between them. Corner joint solutions by building framework elements are previously known among other things from the Finnish publication print 94276 and application prints 222/68, 864707, 950847 and 94276. In said solutions there are interior wall and exterior wall elements. The wall elements extend over the corner, or at least one of them. If both wall elements extend over the corner, on the outside a double corner will be visible (94276) or a corner made massive by means of extra bits between the elements (864707 and 222/68. If only one of the two wall elements extends over the corner, the corner extension will be narrow (950847, 960737) with a thickness remarkably thinner than the wall, 50% of the wall thickness only. In the above presented solutions the corner piece does not look outwards like a massive log as thick as the wall. It is made as thick as the wall either by joining parallel elements together or it is formed of one log but with a thickness less than half of the wall thickness. By means of a corner joint as per this invention the above problem is solved and the invention is characterized in that the elements forming the interior wall in the corner are placed crosswise and reach, substantially, to and end in the elements that form the exterior wall, and that the crosswise stacked corner elements have extensions, which in the space between corner elements extend over the intersecting interior wall elements and said extensions have an interlocking shape, such as a notch at the crossing elements. 2 Other features characteristic of the invention are presented in the enclosed sub-claims. The advantage of the corner joint of this invention is that by means of it the interior wall and exterior wall elements can be interlocked at a distance from one another, that the corner is in horizontal plane directions secured in a manner that it cannot be unlocked and so that the external elements will stay in position, the interior wall won't move either inward or outward and neither can the corner elements move in the horizontal plane. The log portion then forming the corner element can be, for instance, as thick as the wall or as thick as preferred. In the following the invention is disclosed with reference to the enclosed drawing, where Fig. 1 shows a corner joint from above. Fig. l.l shows a corner joint from above and made of round log elements Fig. 2 shows the interior wall element top ends and corner elements. Fig. 2.1 shows the interior wall element top ends and corner elements made of round log elements. Fig. 3 shows the crossing of interior wall and exterior wall. Fig. 4 shows the cross-section of a wall. Fig. 5 shows a corner joint diagonally viewed from above. Figure 1 shows the corner joint of a log house from above, where the elements forming the interior wall, such as logs, are marked 4.1 and 4.2 and the elements forming the exterior wall elements, such as logs, are marked 3.1 and 3.2. There is heat insulation 6 between the elements. Further away on the wall there is a spacing piece 5 keeping the elements at proper distance. The top ends of neither element will not become visible from the outside, but the elements end into side the corner. Separate corner joints 1 and 2 even fitted in and stacked one upon another between the elements will form a visible corner. Accordingly, the appearance of a corner is 3 produced only by choosing a suiting massive log, out of which the corner elements are cut off and shaped. The broken lines illustrate how the exterior free top end of the corner element can be preferred as to its thickness according to how massive an appearance is wanted. The corner elements extend inside the wall at least slightly over the interior wall element in order to produce interlocking by means of a notch system. For instance, the exterior wall elements reach with equal top ends and without interlocking into the vertical notch formed inside corner elements 1 and 2. In figure 1.1 a corresponding corner joint is illustrated in a round log structure. The exterior wall elements 3.11 and 3.22 are also cut off with equal top ends, for instance, with 45EC bevels added to them. Shaping the interior wall element top ends is somewhat more demanding compared with the figure 1 structure. Likewise, the corner elements 1.1 and 2.2 have 45C° bevels. Figures 2 and 2.1 include some feasible solution alter-natives for the top ends of interior wall elements 4.1, 4.2 and 4.11. 4.22. In the figures also constructional changes of corner elements 1,2 and 1.1, 1.2 with different interlocking notches in extension portions 10 and 10.1 of the elements are shown. Interlocking notches in the extension portion are needed both for the other crosswise corner element and the crosswise interior wall element. The extensions have interlocking notches on their upper and bottom surface. The extension portions 10 and 10.1 of the corner joints are much thinner than the visible portion on the outside. Figure 3 shows a partition wall 7, which in conventional framework structure can be taken through the exterior wall, e.g. both half-notched. Figure 4 is a cross-section of the wall. The interior wall 4 elements 4.1 are substantially thicker than the exterior elements 3.1. In the wall portions distance-adjusting pieces 5 are used and the elements can be fastened by nailing diagonally or secured with screws to them. Pieces 5 are advantageously broken-off from the interior or exterior wall elements and mounted so that their joint 11 is in the middle of the wall element joint 12. Thus sliding of pieces 5 crosswise in the wall direction is prevented and straightness of wall retained. To ensure tightness, in the joint between interior wall elements insulation 8 is used and cardboard or lining paper on the inner surface of logs. Thermal insulation 5 is advantageously made of woodfibre blasting wool. The interior and exterior wall elements are of similar height and Simultaneously mounted in layers. Figure 5 shows a corner joint as per the invention diagonally viewed from above. Each corner element has notches in its extension, by means of which the extension interlocks the other crosswise corner element and the interior wall element so that they cannot move in the direction of the interlocking extension. Shaping of wall element top ends is easily done mechanically as well as shaping of the corner elements. The exterior wall element is most conveniently thinner than the interior wall element. The exterior wall element is exposed to thermal fluctuations and its massiveness is hardly of any use. The aim is to maintain constant temperature in the interior wall, i.e. inside the insulation layer, and its massiveness, produced among other things by thickness, makes it better. When the corner element extensions are thinner than the thickness of the insulation layer and the interior wall elements on top of the other are not in contact with each other in the insulation space but there is a gap between them, the insulation space extends through the corner, whereby, among other things, the blasting wool can fill all empty spaces in the corner.

Claims: 5 PATENT CLAIMS 1. A corner joint for a building made of timber elements, the exterior surface of which is a wall construction made of logs or similar elements ( 3.1, 3.2) , ( 3.11, 3.22) and whose interior surface is a wall construction made of logs or similar elements (4.1,4.2),(4.11,4.22) and where in the space between said wall constructions a thermal insulation (6) is fitted, whereby both elements (3), (4) end in the corner inside the wall construction and elements (4), which form the interior wall, are arranged crosswise in the corner and reach to and end substantially in elements (3), which form the exterior wall, and the exterior corner, which extends over the wall line of the building, is made of separate corner elements (1,2), (1.1,2.2) made on top of another, characterized in that the crosswise stacked corner elements (1,2) comprise extensions (10), (10.1), the width of which between elements (3,4) is substantially smaller than the width on the corner outside and substantially smaller than the width of the intermediate space and that the corner elements reach over the crosswise interior wall elements (4), while said extens-ions have an inter-locking shape, such as a notch at the crossing elements. 2. A corner joint according to patent claim 1 characterized in that exterior wall element (3) extends into the crossing corner element (1,2) and ends in the notch in said element. 3. A corner joint according to patent claim 1 and 2 characterized in that by means of the groove and notch system of corner element(l,2) the interior and exterior wall elements that are in contact with said element are interlocked at a distance from one another. 4. A corner joint according to any of the above patent claims 1-3 characterized in that the thickness of corner joint (1,2) can be chosen regardless of total thickness of the wall structure 6 5. A corner joint according to any of the above patent claims 1-4 characterized in that exterior wall element (3) ends freely without blocking in the vertical notch formed in joint elements (1,2) . 6. A corner joint according to any of the above patent claims 1-5 characterized in that interior wall element (4) is broader than exterior wall element (3). 7. A corner joint according to any of the above patent claims 1-6 characterized in that the insulation layer between the walls extends over the corner joint.

Inventors: HAUTALA JOUKO, HAUTALA, JOUKO
Applicants: HAUTALA JOUKO, RED WIRE OY, HAUTALA, JOUKO
Application year: 1999
Main classification: E04B2
IPC codes: E04B2