FI71973B - LJUDDAEMPANDE DOERR - Google Patents

Description

71973 Sound absorbing door

The invention relates to sound-absorbing doors and in particular to doors of the type referred to as "double-structure without mechanical joints".

By making said type of door frame, for example as a lamellar structure formed by wood fiber lamellae, for example in accordance with the Swedish publication 33-250, a certain structure for damping lateral resonances is obtained. 10 The sound attenuation can be further improved if the known door is provided with a split frame, for example in accordance with the Swedish publication 349093.

However, the prior art does not achieve an optimum solution to the sound attenuation problem with a particular material combination or weight in use.

The object of the present invention is therefore to provide such a solution, while taking into account the manufacturing possibilities which can be realized practically and economically.

The invention therefore relates, in its broadest sense, to a door comprising a frame and frame structure and a lamella arrangement associated with the frame structure, as well as a cover layer arranged on each side of the frame and frame, the door being characterized in that the lamellae in the frame 25 face each other at least longitudinally. for the most part, their cross-sections are discontinuous.

The slats can then in principle be placed either in the height or width direction of the door.

The successive lamellae are preferably alternately porous and hard material, for example a wood fiber material.

In principle, the door frame is preferably made of a so-called double structure without mechanical joints (distinguished from what is known in the art as a "solid door"), 2 71 973 wherein the lamella arrangement is double and fixed to a load-bearing base or the like.

The support base preferably comprises an overlayer-5 debris arrangement comprising two sheets, preferably of hard wood fiber material.

The discontinuities of the lamellae are preferably saw grooves or the like extending from the side of the lamellae bearing the side of the lamellae and cutting most of the respective lamellae.

10 The slats are sawn to substantially the same length and are less than twice the height of the slats (the height is measured perpendicular to the door surface).

The invention will now be illustrated by way of example in the following description with reference to the accompanying drawings, in which Fig. 1 is a perspective view showing a door frame or part thereof, Fig. 2 is a cut-away vertical section of a door with Fig. 1, Fig. 3 is a schematic view the method of manufacturing the body of the double structure, and Fig. 4 shows a partial view of how the body according to Fig. 3 is placed in the frame and indicates how the "double structure" can be suitably sawn.

Fig. 1 is a partially sectioned perspective view of a door frame 10, which in the embodiment shown consists of two layers 11 and 12, both of which are formed of fibreboard or sawn wood board, respectively, with successive lamellae, for example 14 and 13, alternately porous and hard wood-fiber material. The lamella arrangement is distinguished by a central panel 15, for example made of a hard wood fiber material, but not attached to a panel, which is not absolutely necessary per se, but which, inter alia, has 3,71973 certain properties in terms of fire protection and to some extent sound attenuation. The other side of each lamella arrangement has a cover layer, each of which is glued together or otherwise joined to one of the hard fiber boards 16, 17 or the like.

Each lamella arrangement 11, 12 has break points, in the embodiment shown they are sawing slits 21 extending from the central plane of the body 10 to the inner cover layer 16. The points of interruption or discontinuity in the lamellae 10, 14 can also be obtained in other ways, for example by sawing the lamellae only partially, which may be advantageous from the point of view of processing, or the pre-cut lamellae pieces can be placed against each other

The lamellae 13 and 14 are detached from each other and from the central plate 15, but are attached to the cover layer on all or part of its surface. The "free" relatively short lamella pieces obtained in this way greatly improve the sound-absorbing properties of the material by their degree of freedom, which has meant, among other things, that the same sound-absorbing coefficient has significantly reduced the overall weight of the door.

The lamellae 13 and 14 separated by the sawing slits 21 are preferably of equal internal dimensions, the fish rule being that the sawn length is less than twice the height of la-Mell (height measured at right angles to the door surface and lamellae at right angles to the slabs) .

In the finished door, the lamellae 13 and 14 are preferably in the position that they are in the vertical direction of the door, but the lateral direction is not in principle impossible.

The frame structure 10 is intended to be placed in a door frame 18, shown in vertical section in Figure 2, and to be provided with reinforcements 19 and 20. The door is provided with a groove 22 in a known manner 22 for a sealing strip 23 which 4 71973 together with sealing strips 24 and 25 and with respect to threshold 27.

Figure 3 shows how one part of the door frame 10 can be made by placing lamellas 13 and 14 fixedly in a tight pin between two wooden beams 28 against the bearing base 29, which can be placed in the door frame 26 (Fig. 4) with or without the central plates 15. In this connection, the plates 29 and 30 form the inner plates which the plates 16 and 17 correspond to in the cover layer arrangement according to FIG.

Figure 4 shows in broken lines 31 how the existing sealing groove can be extended so that it extends 15 through the entire frame. With such a procedure, an ordinary door can be separated from the double-structure type and the lamellae 13 and 14 cut to the desired lengths with a lamella saw and then the door halves can be joined, for example in accordance with Swedish Announcement 340093.

Claims (7)

71973 A sound-absorbing door comprising a frame and frame structure (18, 10) and a lamella arrangement (11-14) associated with the frame structure (10), and a cover layer (16, 17) located on each side of the frame (18) and the frame. , characterized in that the lamellae (13, 14) in the body (10) are against each other and are discontinuous in their longitudinal direction at least for the most part. Door according to Claim 1, characterized in that the immediately successive lamellae (13.14) are formed alternately by a hard or porous material, for example a wood fiber material. A door according to claim 1 or 2, wherein the door frame is mainly formed by a so-called double structure without mechanical joints and in which the lamella arrangement is doubled, characterized in that each lamella fastening (11, 12) is attached to a supporting base (16). ) or equivalent. A door according to claim 3, characterized in that the support base (16) is part of a cover plate arrangement consisting of two plates (16, 17), for example a hard plate. Door according to Claim 4, characterized in that the discontinuities are provided by sawing slits (21) or the like which extend from the side of the lamella (13.14) bearing base (16) and intersect the main part of the respective lamella. Door according to Claim 5, characterized in that the discontinuously divided lamellae (13, 14) have identical lamella pieces, the sawn length of which is less than twice the height of the lamella. Door according to Claim 6, characterized in that a fibrous fibreboard (15) or the like is loosely arranged in the respective lamella arrangement (11, 12) between the discontinuous lamellae (13, 14). 71973