JOINT FOR DOOR FRAMES AND OTHER SIMILAR PROFILES

Abstract: Joint for door frames or similar profiles, like window casements and frames, picture frames etc., in which the profiles (1, 2) that are to be jointed form an angle between themselves or a direct extension to each other. On the outer or inner surfaces of the profiles has been made an incision or a groove (51, 27, 28) wherein a junction plate (3) made of metal has been inserted. The junction plate (3) is either corrugated, jagged or toothed (33), whereby the effective thickness of the junction plate is made bigger than the width of the groove (5) in the profiles, and that the pressing of the junction plate into the groove causes it to be fixed in position. The inner edge of the junction plate (3) at least partly comprises toothing (6, 36). The teeth being pressed into the bottom of the groove at the end of the jointing.

Description: JOINT FOR DOOR FRAMES AND OTHER SIMILAR PROFILES The object of the present invention is a joint for door frames and other similar profiles. These include, among others, window casements and frames, picture frames, etc. The invention is preferably applied to jointing frames or such, made of wood, but it is also fit for jointing parts made of other materials, for instance plastic. Door frames, casements, and other similar profiles are nowadays generally manufactured in ready-made elements by sash and door factories or carpenters' workshops, and then mounted in their respective positions at- buildings sites. The highly developed standardisation of doors and windows has made it possible to produce them in large series. The frames and casements produced in series are manufactured using traditional carpenter's joints, the so-called claw joints; these require the use of special routers and are comparatively laborious to produce. Thus it is ususally possible to manufacture the joints only industrially. On the other hand, the transportation of ready-made case- ments and frames is uneconomical, since they take up --a relatively large space. Corner joints for frames with junction plates or bracings of metal are previously known. US patent No. 1 334 553 and German patent No. 816 749 can be referred to as examples. These introduce joints, in which junction plates of metal are placed in a groove in the frame. The junction plates have been attached to the frames by nailing. In the US patent they are hailed on either the inner or the outer surface of the frame, and in the German patent on the lateral surfaces of the frame. US patent No. 1 392 070 gives a junction plate of metal, which is attached to the frame with die-cut teeth. A similar solution is also given in Swedish patent A drawback of the solutions presented above is the awkwardness and slowness of their use. This is due to the difficulty of using nails or the complicated pressure devices needed. Moreover, nails are not desirable on the surface of the frame. The above explained drawbacks can be avoided by using a joint according to the present invention, the character istic features of which are given in the patent claims. One of the advantages of a joint according to the inventi is that the frames can be assembled without special tools or machines. The transportation of the elements is easy and does not require a lot of space, since the assemblage can be carried out at the building site. Frame and casement of different sizes are easy to produce beforehand, due to the fact that the same junction plates can be used in assembling them. In the following the invention is explained in detail wit references to the enclosed drawings. Figure 1 shows one advantageous application of the •*•■ - " invention Figure 2 shows another possible application of the invention Figure 3 shows a junction plate according to the inventio Figure 4 shows a section IV-IV of the junction plate in Figure 3 Figure 5 shows a section V-V of Figure 1. According to Figure 1 the ends of the horizontal and vertical parts 1 and 2 of the frame are slanted at 45° angles. No protrusions nor any kind of grooves are cut fo the joint. Parts 1 and 2 are joined together using junction plate 3 constructed according to the invention. The junction plate 3 is made of a metal plate by bending f _O it in order to produce two flanges 4 and 5, or other similar planes, which are at right angles to each other. The said planes 4 ■ and 5 are placed against the outer edges of the frame parts 1 and 2. For the junction plate 3 a groove 51 has been made in the frame. The junction plate is corrugated so that it can be inserted into the said groove 51 only by pressing. To provide an additional fastening effect the edge of the junction plate comprises teeth 6, which are pressed into the wood. The flanges 4 and 5 are respectively provided with knobs or protrusions 7. Figure 2 shows another advantageous application of the present invention. In this case the vertical and horizontal parts 21 and 22 of the frame -are respectively slanted at 45° angles. On the outer surfaces of the frame have been cut two grooves 27 and 28, wherein the junction plate 23 according to the invention is pressed. The junction plate 23 is made e.g. by bending a metal plate or by tooling out of U-profile. The junction plate 23 consists of two legs 24 and 25 at right angles to each other and placed against the outer surfaces of the two parts of the frame. Both legs have a U-shaped cross-section. Then both legs of the U-profile are pressed into the grooves 27 and 28 in the frame. The fastening of the junction plate into the grooves '"" is achieved through a similar corrugation as in Figure 1. Correspondingly also parts 29 and 30 are provided with teeth 31, which are pressed into the bottoms of the grooves 27 and 28. Figure 3 shows another example of a preferable application of the junction plate according to the invention. This junction plate is bent out of a metal plate, and it comprises flanges 34 and 35. The part to be inserted in the groove of the frame is now provided with triangular protrusions 33 punched out of sheet-metal, the shape of which can also be seen in the section in_Figure 4. The edge of the junction plate also comprises teet 36, which are pressed into the bottom of the groove in the frame.

Claims: PATENT CLAIMS ' " ~ 1. Joint for door frames or similar profiles, in which profiles (1, 2) that are to be "jointed form an angle between themselves or a direct extension to each oth and on the outer or inner surfaces of the profiles has be made at least one incision or groove (51, 27, 28), wherei a junction plate (3) made preferably of metal has been inserted, c h a r a c t e r ! z e d by the fact that the junction plate (3) is either corrugated, jagged, or tooth (33), whereby the effective thickness of the junction pla is made bigger than the width of the groove (51) in the profiles, and thus the pressing of the junction plate int the groove causes, it to be fixed in position. 2. A joint according to patent claim 1, c h a r a c t e i z e d by the fact that the inner edge of the junction plate at least partly comprises toothing (6, 36) or such, the teeth being pressed into the bottom of the groove at the end of the jointing. 3. A joint according to-patent claim 1 or 2, c h a r a c t e r i z -e d by the fact that a junction plate is place both on the outer and on the inner surface of the profile 4. A joint according to one of patent claims 1 to 3, c h a r a c t e r i z e d by the fact that the direction of the corrugation or toothing in the junction plate form an angle with the direction in which the junction plate i to be pressed into the profile. O

Inventors: ALANDER K
Applicants: ALANDER K
Application year: 1981
Main classification: E06B3
IPC codes: E06B3