FI64502B - FOERFARANDE FOER TILLVERKNING AV MOEBLER ELLER DETALJER SOM UPVISAR BOEJDA FORMER OCH BESTAOR AV MASSIVT TRAE - Google Patents

Description

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5¾¾ (4S) ^ ^ (51) Kv.lk. ^ Int.Cl. ^ A 47 C 5/00 ENGLISH —FINLAND (21) Pit.nttlhtkimu.-Ptflttnteknlni 780103 (22) Hik * ml * pil ¥ l - Arattningidaf 13.01.78 (23) Starting point —Glltishttad * g 13 Q1 jg (41) Became public— Blivlt offsntllf ^ ^

National Board of Patents and Registration / 44) Nlhtlvftkslpsnon | a moonLjulkilsun pvm. -.

Patent · och registerstyrelean 'Ansöksn utisjd och utUkrHtsn publkersd 31.0o. o 3 (32) (33) (31) Privilege requested - Begird prlofttet (71) Lahden Puutyö Oy, PO Box 177, 15101 Lahti 10, Finland-Finland (Fl) (72) Aarre Horko, Soramäki, Hannu Peltonen, Helsinki,

Hannu Taipale, Maakeski, Finland-Finland (Fl) (7 ^) Forssen & Salomaa Oy (5 * 0 Method for the manufacture of furniture or parts of solid wood containing bent shapes -Förfarande för tillverkning av Möbler eller detailjer som upvvisar böjda former och bestär av massivt trä

The invention relates to a method for manufacturing furniture or parts made of solid wood containing bent shapes.

One known method of making furniture or parts of solid wood containing bent shapes is based on conventional bending. The disadvantage of this known method is, firstly, the very uneconomical use of the raw material, since the production of long, branchless and flawless bendable parts causes a very large loss of raw material. Secondly, a sufficiently small-radial bending of the raw material thicknesses required for the strength of the structure is not possible, for example, from solid birch with reasonable certainty.

In the traditional bending method, the manufacture of furniture parts requires, as noted above, long piece dimensions. As a result, the 2 64502 bending machines are, of course, large in size and difficult to work with. The bending stage has to deal with a lot of timber, so that the wetting of the wood and the drying stage after bending is a high-energy and labor-intensive operation. In addition, in the traditional bending method, each different part of the furniture requires its own press mold made for it, which further causes additional costs for the product due to setting and mold costs.

Another known method is based on lamination. Furniture or parts made of laminates are made of thin cut or turned veneer. This method also has numerous drawbacks. First, the cost of raw materials becomes relatively expensive and making veneers, applying glue and stacking requires a lot of work. In addition, in the bend made by the laminates, the strength is based solely on the adhesive joint that connects the veneers to each other. As a result, there is a risk that if the adhesive joint fails, the bend will straighten.

A common drawback in both of the methods described above is that curved furniture parts made both by bending and by laminates are heavily post-processed and generally require manual work.

The object of the invention is to provide an improvement on the currently known methods. It is a detailed object of the invention to provide a method in which the numerous drawbacks of the known methods can be avoided.

The object of the invention is achieved by a method which is mainly characterized in that a) separate straight parts are made b) separate curved parts are made, and c) the curved parts are connected between the straight parts.

According to claim 2, in a preferred embodiment of the method according to the invention, curved parts having the same bending radius are produced. In this case, according to claim 3, such curved sections are cut to the desired number of dimensions in each case.

The method according to the invention achieves a number of significant advantages. In the method according to the invention, the technically difficult bending step is facilitated because the part to be bent has a small amount of wood. In this case, wetting, bending, drying and further processing of the wood to be bent is easy, and in addition, the machines required for handling are small in size. In addition, when constant-radius bends are used, it is possible to build special machines for bending and machining in an economically advantageous manner.

The invention will be explained in detail with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawing, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a piece of furniture made by the method according to the invention, which is formed of three parts.

Figures 2-4 show diagrammatically how furniture parts requiring different degrees of angles can be made from a bend bent to the same radius by the method according to the invention.

In the embodiment according to Figure 1, parts 1 and 3 are made of birch by a conventional direct machining method. Part 2 is bent from red beech and thus the wood is made to bend to a relatively small radius. Since the piece of furniture shown in Fig. 1 is made of three separate parts 1, 2 and 3, the use of low-quality wood also becomes possible. The short part 2 should be made of suitable wood, such as red beech, due to bending. Instead, parts 1 and 3 can be of ok quality and birch.

Figures 2-4 show how furniture parts requiring different degrees of angles can be made from a bend bent to the same radius by cutting the curved part 2 to the desired quantity in each case.

Claims (3)

4 64502 A method of making furniture or parts made of solid wood with bent shapes, characterized in that a) separate straight parts (1,3) are made b) separate curved parts (2) are made, and c) curved parts (2) are joined in straight lines. between the parts (1,3). Method according to Claim 1, characterized in that curved sections (2) having the same bending radius (R 1) are produced. Method according to Claim 2, characterized in that the curved sections (2) are cut to the desired number in each case.