GB2400815A

GB2400815A - Method of forming wooden frame pieces

Info

Publication number: GB2400815A
Application number: GB0309075A
Authority: GB
Inventors: Ian Malcolm Robertson
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-22
Filing date: 2003-04-22
Publication date: 2004-10-27
Anticipated expiration: 2023-04-22
Also published as: GB0309075D0; GB2400815B

Abstract

A method of making wooden window or door frames or laminated beam sections, the frames having internal longitudinal channels 7 into which impregnation liquid for the preservation of the wood may be introduced, the object being made of two or more parts 1,2,3 whose internally extending side face have longitudinally extending grooves with holes 8 extending transversely from the grooves, the parts being glued together so that the grooves form the channels in the frame. The channels and the holes are preferably closed at their ends with a plug 10, the plug being removable when impregnation liquid is introduced.

Description

24008 1 5 A METHOD OF MAKING WOODEN OBJECTS. PREFERABLY FOR USE

IN THE MANUFACTURE OF WINDOW OR DOOR FRAMES AND

BEAMS FOR STRUCTURAL USE

The invention relates to a method of making wooden objects, preferably for use in the manufacture of window and/or door frames, said objects being provided with internal longitudinal channels into which impregnation liquid for the protection of the object against timber decay, such as wet-rot and mould fungus may be introduced from the outside via other channels.

Prior Art

Objects of the above type are used for the manufacture of frames. Wooden

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À objects of this type are frequently exposed to attacks from wet-rot or mould À ..

fungus, where e.g. the constructive protection is insufficient, or because the : wood is not sufficiently resistant to such attacks. A: À:e

Resistance is achieved by impregnating the object, which takes place par À À À. ticularly by a preceding impregnation. Àe

i. .: 20 However, to ensure a pemmanent impregnation, it must be possible to sup- ply impregnation liquid to the object after the assembly, which is to take place at specific intervals of time.

This impregnation may take place via channels which extend internally in the frame, and which may be filled with impregnation liquid as required.

The specification of EP 0 890 012 B1 discloses a method of making a frame member with internally extending channels for use in the application of such an impregnation liquid.

The channels are made by milling one or more grooves in the outer side of the wooden frame object, said grooves being then covered by means of a strip which is fixedly glued in the groove to form a channel at the bottom of the groove.

Actually, the method is sufficiently effective in temms of impregnation, but it is relatively expensive to perform.

This is caused by the making of the grooves and the subsequent covering by adapted strips, and since the grooves must have a certain dimension in order for the strip to be mounted, this involves a corresponding weakening of the strength of the frame. e Àe À .

Finally, there is a limit to how deep the grooves can extend and thereby a À practically conditioned limitation on the position of the channels in the : frame. I: À:e

Obiect of the Invention À À À Àe À : 20 The object of the invention is to manufacture wooden objects in a speedier and more rational manner while giving the channels the best possible con figuration and position relative to the needs of the object, and this is achieved according to the invention in that the object is made of two or more parts whose internally extending side faces are provided with longitu dinally extending through grooves and holes extending transversely there from, following which the parts are glued together to a laminated wood ob ject and such that, after assembly of the parts, the grooves constitute the longitudinal, internally extending channels in the object.

Hereby, it is possible to machine the side faces with grooves on the individ ual parts and then assemble them into a laminated wood object in a surpris ingly simple manner, so that the finished object has the necessary channels extending in the best suitable positions, i.e. with the most effective position relative to the object. The channels do not weaken the frame, as it just comprises a machining to form the channel itself and is not to accommo date a strip which has a considerably larger dimension. The laminated ob ject moreover has the advantage of having dimensional stability, as it counteracts tendency to warping and twisting.

When, as stated in claim 2, parts are used for the laminated wood object which essentially have the same dimension, a rationalization of the opera tion is achieved, while ensuring a good strength because of the uniform cross-section. Àe À. À .

When, as stated in claim 3, the desired machining of the profile is carried À out, the finished object will appear to be manufactured from a massive : piece of wood. À:e

Finally, it is expedient, as stated in claim 4, to provide the channels with a À À. plug - e.g. in the form of a plastics or wooden member - at the mouths of : 20 the channels, thereby achieving a closed liquid channel system extending inside the wooden object. Impregnation liquid may be fed to the channel system via a plug.

The Drawing By way of example, the invention will be described more fully below with reference to the drawing, in which fig. 1 shows three wooden parts toward their end faces, fig. 2 shows the parts provided with channel grooves and bores, fig. 3 shows the parts after assembly to a laminated wood object, fig. 4 shows the laminated wood object after completed profiling, and fig. 5 shows the finished, adapted object in the form of a sill.

Description of an Embodiment

The description will first comprise the object itself, as shown in figs. 4 and 5, in the form of a wooden piece of frame as it may be configured when it is to be used as a sill 9. se Àe À

The profile of the wooden object is a normal profile with a rebate for the À window or door frame and a drip with an underlying drip groove. À:.

Channels 7 extend inside the object which, as indicated in dashed line in fig. 5, extend as two longitudinal internal channels in the entire extent of the À À object. À. : 20

As is moreover indicated, the channels 7 are closed at a distance from the mouths at the ends of the object, and this closure may take place either by discontinuing the channel groove after the manufacture or, as indicated in fig. 4, by inserting an adapted plug or piece of wood 10 into the channels 7.

As is additionally indicated in figs. 2 and 3, connecting channels in the form of bores 8 extend transversely to the channels 7 to form a continuous liquid passage through channels 7 and bores 8 in the wood.

The bores 8 are also closed at their outlet, and some selected bores termi nate on the side of the frame member 9, where a plug 10 may be mounted in a corresponding manner, as indicated in fig. 5.

Impregnation liquid, optionally at a slight pressure, may be supplied via the bore or optionally via a channel 7 at the ends of the frame, as indicated by the arrows 11.

When impregnation liquid has been introduced into the channels and the bores, they are closed by means of the plug 10, and the liquid will spread evenly through the entire wooden frame object and thereby ensure opti mum impregnation against wet-rot and mould fungus.

Further, fig. 5 indicates the mounting of a frame side member, which may likewise be provided with internally extending channels which are also closed by means of plugs to thereby prevent impregnation liquid from leak À 15 ing. À:. À.

The method of making an object according to the invention will now be de scribed with reference to figs. 1-3. À À À À

: 20 In the example shown, the starting objects 3 are rectangular wooden parts 1-3 which are dimensioned such that together they will constitute the fin ished laminated wood object 4, as indicated in fig. 3.

First the parts are machined in that the two side parts 1 and 3 are provided with a longitudinal groove or recess 7 on their internally extending faces 5 and moreover with some transverse bores 8.

Similarly, the central part 2 is provided with grooves or recesses 7 on both side faces 6 and with transverse bores 8 which extend between the two grooves 7. The position of the grooves 7 is such that they extend opposite each other in adjacent parts, and such that they constitute the complete channel system, as shown in fig. 3, after the parts have been assembled.

The assembly is preferably a laminated wood assembly which comprises application of glue to the side faces and subsequent pressing-together and hardening.

This results in a channel 7 which is easy to make and saves material, and which may be made in a continuous operation and with transverse bores 8 extending at selected locations.

This limits the machining to an absolute minimum, and there is no need for subsequent attachment of cover strips or channel strips, as has been necessary until now. À e. À e

. 15 After the assembly, the profile is fommed as indicated in fig. 3, where the hatched wood is removed and the drip groove is provided. À:e

The wood for the side members and the top member is manufactured in a À quite corresponding manner, which may also be equipped with the de À . : 20 scribed, internally extending charnel system.

The finished product has the maximum strength, and with impregnation deposited in the centre the best possible impregnation and thereby protection against wet-rot and mould fungus are achieved.

Claims

1. A method of making wooden objects, preferably for use in the manufac ture of window and door frames and laminated beam sections, said objects being provided with internal longitudinal channels into which impregnation liquid for the protection of the object against wet-rot and mould fungus may be introduced from the outside via other channels, c h a r a c t e r i z e d in that the object (4) is made of two or more parts (1-3) whose internally ex tending side faces (5, 6) are provided with longitudinally extending through grooves (7) and holes (8) extending transversely therefrom, following which the parts (1-3) are glued together to a laminated wood object (4) and such that, after the assembly of the parts (1-3), the grooves (7) constitute the longitudinal internally extending channels (7) in the object (4). À À .e

2. A method according to claim 1, c h a r a c t e r i z e d in that the frame parts (1-3) have essentially the same dimension. I: À:.

3. A method according to claim 1, c h a r a c t e r i z e d in that the lami À nated wood object (4) is machined to form the finished frame profile (9). À - : 20

4. A method according to claims 1-3, c h a r a c t e r i z e d in that the channel (7) and the bore (8) are closed at the ends with a plug or the like (10) for blocking these, said plug (10) being removed/opened when the im pregnation liquid (11) is introduced.

5. A method according to claim 1 an d substantially as hereinbefore described with reference to the accompanying drawings.

6. A wooden object whenever made by a method according to any of the preceding claims.