DE2712925C3 - Connection of wooden struts, especially for use in furniture construction - Google Patents

Description

The invention relates to a connection of wooden struts arranged at an angle to each other, the first of which is made of solid wood and in the area the connection has recesses outside on two opposite sides and the second is in the Angle to the first extending strut in the area of the connection has two lamellas that form the recesses are adapted in shape and each of which engages and fits into one of the recesses is glued. wherein the opposing base surfaces of the recesses and those facing them Surfaces of the lamellae run straight in the direction of the longitudinal extension of the / wide strut.

It is particularly intended for use in furniture construction,

There, the frame or other elements are in many cases necessary in which Hölzteile wrong angle collide and have to be permanently connected, such as for chairs, Betierif cabinet doors Urid -wänderit Such compounds are both required at the ends of ¹ corresponding furniture parts as well as - example- '

ι ■

wise for doors and cupboard walls - to stiffen the frame construction.

A connection of the type described is known (Fig. 339 in "Der Möbelbau" by F. Spannagel, TO. Ed. P. 103).

In this case, a wooden part in the area of the connection has a slot into which the to be connected Wooden part engages with a pin attached to it.

The areas of the connection to be glued are relatively small, and it is also precise Fit of the connection points and thus adaptation of the wooden parts (wooden struts) mostly not too reach. In addition, for proper gluing, pressing is required simultaneously in at least two directions are required and there is a tendency that when the parts are joined together after application In any case, the glue is partially pushed away from the surfaces by pushing the glue into one another will. It either collects in front of the inserted pin and thus easily prevents it a precisely fitting connection, or it is pushed outwards and thus loses all function.

In the known connection there is also the risk that they are in the natural work of the Wood as a result of existing residual moisture, increasing desiccation or use under different conditions Temperature or humidity conditions dissolve after a short period of use. In addition, the considerable stress caused by the angular effect is concentrated, as is the case, for example, with a Stool occurs predominantly on the small area of the peg and often leads to the loosening of the connection after a short period of use. When using open slots, the danger is increased increased so that, due to the leverage effect, only the glue surfaces hold the connection together under load, on the other hand, the pin cannot find a hold on the other wooden strut itself «.

The required accuracy of fit in the known connections is very labor-intensive and therefore very labor-intensive expensive. If the connections do not consist of round bores and round pins, the Elaboration of the slots or tenons always runs the risk of sitting. ι an excessive amount of wood splits and thereby unwanted reject occurs. Due to the notch effect, the connections also show a considerable risk of breakage in the area of the inner ends of the slots or the pegs.

Due to the design, the known types of connection also require that both are to be connected Wooden parts are made of solid wood, with the necessary cross-sections if the dimensions are too small Resilience is not given. Should more on the connected parts or one of them Parts are attached, for example a chair back or a cabinet door panel. so are about it In addition, special precautions are required for this, be it in the form of bores, slots or grooves, be it by screwing or the like.

After all, at least interfere with the known ones Connections with slots and tenons after are visible on the outside, this creates the aesthetic impression of the furniture

Another type of connection with tenons and slots is known, but in which the shape of the Slots and tenons are chosen to be trapezoidal in order to achieve a greater load capacity.

The object of the invention is to create a wood connection of the type mentioned, in which

- the stability with regard to pressure and tensile loads on the surfaces of the connection to be glued improved as well as a more precise fit of the connection points and thus adaptation the wooden strut is reached;

- a solution of the wood connection when the wood works naturally as a result of existing ones Residual moisture, increasing dehydration or different temperature or humidity conditions is excluded further than with the known connection;

- the pressure or pressure acting on a wooden strut Tensile forces on a larger area of the other Wooden strut in the area of the wood connection can be transferred than with the known Wood connections and thereby the gluing is relieved;

- The risk of breakage in the area of the tenons and slots as a result of the notch effect in the design the tenons and slots are excluded in uen known wood connections;

- the risk of splitting off existing in the production of the known wood compounds excluded from excessive wood;

- when joining the parts of the wood connection compared to the known compounds is avoided that after application of the Glue by pushing these into one another at least partially from the ones relevant for the connection Surfaces is pushed away and thus at the same time prevents a precisely fitting connection;

- A simplification of the production achieved when gluing the wood connection becomes that a pressing is only required from one side in order to ensure a precise fit and to achieve gluing;

- The production compared to the known wood connections is simplified and cheaper;

- also in aesthetic terms an improvement over the known wood connections, in particular compared to the connection of open pins and slots is achieved.

According to the invention, this object is achieved in that, in the case of a connection, the connection described at the outset Type those listed in the characterizing part of claim I. Features are provided.

The wood connection designed in this way is durable and more resilient than the known. Due to the concave design of the recesses of one wooden strut and the convex design of the two slats of the second wooden strut, adapted to the recesses, and / was such that the concave recesses in the direction of the longitudinal extension of the first wooden strut and the convex surfaces of the slats of the second If the wooden strut extends in the direction of its longitudinal extension, the area of the connection which is effective for absorbing tension and / or pressure when subjected to stress is significantly increased compared to the known wooden connections. While in the known Holzverbin-fertilize train and / or pressure only in a certain part of the connection and therefore have to be absorbed by this alone, tensile and compressive forces are largely due to the convex-concave design of the two struts of the wood connection in the wood connection according to the invention evenly distributed over the entire area of the base areas of the recesses or the convex lamellae. In addition, the convex-concave design has the effect that the "> first wooden strut of the wood connection with the concave recesses widens its longitudinal extent in both directions so that the lamellas do not protrude or emerge at any point openly as in the widely used open" mentioned -

Hi nen slots with tenons. The second wooden strut takes place therefore, in the entire area of the wood connection, hold directly on the other wood strut and will not just held by glue.

Furthermore, since the concave or convex shape

r> design of the effective base areas in the wood connection with sharp cutouts and edges as in If the tenons and slots of most conventional connections are missing, the notch effect is also eliminated the risk of unwanted wood splitting or so:

- ■ ο breaks in the area of the slots ι · .i tenons. Not least becomes an up'mnaic adaptation ier hoiz connection parts made possible, which is hardly possible with conventional wood connections; In any case is a major simplification of this optimal

. '■> Adjustment is a prerequisite for the stability and durability of a wood connection.

When gluing the two lamellas of the second wooden strut in the recesses of the first wooden strut becomes according to the enlarged area of the

jo connection also increases the gluing area; Above all, the area on which the glue is effective is compared to all known wood connections increased and also the stress on the glue is significantly reduced in that

Γι the second wooden strut with the two slats - like mentioned - in the entire area of the connection on the first wooden strut in its recesses.

Another advantage over the previous ones

Wood joints is that by using

■ in matching concave recesses of the eir jn wooden strut and convex lamellas of the second wooden strut dimensional changes of the wooden struts, especially in the area of the recesses and the lamellas, when the wood works naturally

-n follow existing residual moisture, increasing Dehydration or use under different temperature or humidity conditions be compensated by a barrier effect comparable to that of plywood. A crack at the

•> n Post-drying of the wood is avoided. Through the Using thin slats is the risk of residual moisture in the wood and thus one dimension »Change of the slats across from one wooden strut the recesses of the other wooden strut

r> at least considerably reduced.

In terms of production technology, the wood connection offers the advantage that when the two wooden struts are glued together, pressure is only required in one direction, namely in the form of the side pressure, because the

Wed lamellas, automatically in the concave bulges fit into the other wooden strut and adjust over the entire base of the bulges be pressed. In contrast, with the well-known Wood bonds a pressure of at least

b ^r , two sides essential, namely longitudinal pressure in the direction of the slot and side pressure. At the same time, when gluing in the wood connection according to the invention, in contrast to the conventional wood

connections no necessary glue from the ones to be glued Surfaces are pushed away, but at most excess glue escapes "without the Adhesive areas are restricted.

Finally, the wood connection according to the invention aesthetic advantages over the known compounds. She brings after joining through the: visible edge lines of the concave or conical surfaces a harmonious one Overall picture, especially when the outsides of the slats of a wooden strut with the outsides finish flush with the other Holzstrehc.

In an embodiment of the invention, the measures listed in the characterizing part of claim 2 are met.

In the proposed configuration of the second wooden strut in the form of two parallel spaced apart at gCGruMGtefi i ^ eiStcM iTiit jcVvchS 6iP: cl def LniTicücfi iii'iu connection by tenons or screws, there is an additional advantage over the known wooden connections that the lamellae due to the convex Design have the largest cross-section at the point where the pin, if necessary with the bushing - or the screw are carried out; This also results in a higher stability and resistance of the connection than with the known connection. The above-mentioned tenons or screws additionally increase the stability and durability, since the glueing of the connection is further relieved, so that it may even be possible to dispense with it.

A simplification results as an additional advantage the production of the second wooden strut, since the convex design of the lamellas is also free of can be processed externally.

In addition, there is the possibility of self-assembly by the consumer, since it is only the Composition of the wooden struts and connection by means of the screwed-in pin or a Screw required. Such self-assembly is only possible with the known wood connections Effort possible.

It has proven to be advantageous if the holes) - if necessary with bushing - in the area of the exit of the lamellas from the area of the connection is or are attached.

As far as the wood connection according to the invention is used in objects in which further Longitudinal or cross struts are present, such as. B. in chairs, tables and beds, can with the alternative Design of the second wooden strut in the form of two strips arranged parallel to it Connection serving pin suchseih j that the other Longitudinal or cross strut is designed as a pin at its end, which is in the appropriate, through the hole extending over both strips - given-

if with bushing - is glued and / or screwed in.

The following is a description of an exemplary embodiment of the invention with reference to the drawings. It shows

Fig. I a representation of the connection in the alternative embodiment of the second wooden strut ¹ in the form of two strips before joining the two pieces of wood, namely a corner connection and an intermediate connection, both the connecting pin or screw,

Fig. 2 shows a representation of the connection as a corner connection as in Fig. 1, but with a pin, before Assemble, with the pin serving as the end piece of a round cross brace,

Fig. 3 shows a representation of the connection as in Fig. 2, the end piece of an angular pin being the pin

FIG. 4 shows the connection in FIG

- '"Front view before and after assembly of the two wooden struts.

The wood connection consists of the first wooden strut 1 made of solid wood and the one on the right Angle associated therewith, made up of two par-

2 ~> allele running strips 2 and 3 existing, / wide wooden struts. The first wooden strut 1 has recesses in the form of concave bulges 4 and S in the area of the connection on the outside on two opposite sides. The two lamellas 6 and 6 engage in these

κι 7 of the two strips 2 and 3 of the second Holzstrebc the lamellas 6 and 7 by convex outward

"design are adapted to the recesses 4 and 5 and in the direction of the longitudinal stretching of the second Strut straight.

π The bars 2 and 3 also indicate directly the actual connection point with the Holzstrebc 1, the parallel holes 8 and 9. After the strips 2 and 3 have been attached to the concave base of the recess, this

Ai) conditions 4 and 5 of the wooden strut 1 - if necessary using a bushing - the pin 10 is used as the end of the additional struts 11 and 12 in the Ausuhrungsnebeispielen aas. The pin 10 is in the bores 8 and 9 of the strips 2

■ π and 3 glued in or screwed in according to Fig.4.

The strips 2 and 3 form in the embodiment described and shown in the figures after the connection with the wooden strut 1 in the

-, n area adjoining the wood connection c * - n gap 13. In these, the chair back and the seat 16 (Fig. 4) can be easily inserted into a chair be attached. Using; the wood connection for doors, cabinet doors "ühd / öder Schrärii-

Ϊ5 side walls serve the column 13 to accommodate the Door panels, whereby these are only inserted through the column 13.

For this purpose 3 sheets of drawings

Claims (3)

27 12 925 claims: 1. Connection of wooden struts arranged at an angle to one another, the first of which is made up of There is solid wood and in the area of the connection outside on two opposite sides Has recesses and the second strut extending at an angle to the first in the area the connection has two slats which are adapted to the recesses in shape and of each of which engages in one of the recesses and is glued there, with each other opposite base surfaces of the recesses and the surfaces facing these Lamellae run straight in the direction of the longitudinal extension of the second strut, characterized in that that the base of the recesses (4,5) and the surfaces facing them the lamellae (6, 7) are concave in relation to the direction of the longitudinal extension of the first strut (i) bulged or convex. 2. A compound according to claim 1, characterized in that the second wooden strut consists of two spaced parallel strips (2, 3), each of which has one of the slats (6, 7), and that the strips through at least one in a matching bore (8, 9) extending through both strips, possibly with a bush, glued and / or screwed-in pin (10) or a screw extending through both strips (2, 3) are connected, the bore and the pin or the screw \ yi arrangement in the region of the slats extend through the first wooden strut or extends. 3. Connection with a pin connecting the two strips according to claim 2, thereby characterized in that the end piece of another wooden strut (11, 12) serves as a pin.