DE102019128345A1 - Flat dowels and wooden structure - Google Patents

Abstract

The present invention relates to a flat dowel (100) for connecting at least two wooden elements (13), comprising a first section (3) and a second section (5), the sections (3, 5) being mutually rotatable about an axis of rotation (7) are arranged.

Description

The present invention relates to a flat dowel for connecting at least two wooden elements and a wooden structure with such a flat dowel.

Flat dowels are often used to connect wooden elements, for example to build shelves, tables or chests of drawers. Depending on the specific application, flat anchors can have different shapes and sizes. Flat dowels can be called shaped springs, wooden connecting plates or so-called lamellar shaped springs, abbreviated as LFF. Some flat anchors are sold under the brand name "Lamello".

Flat dowels are used for many types of connections between elements, for example made of solid wood (synonymous with solid wood material), veneer materials, wood chip materials, wood fiber materials, composite materials or other wood materials. The wooden elements to be connected can be arranged butt or at an angle to one another. An angle connection, which is used as a corner connection, in particular two elongated wooden elements abutting at an angle, can be referred to as a so-called miter. A miter denotes the bisector of the angle at which the wooden elements are arranged to one another and are fixed to one another. With an angle connection, a minimum thickness of the wooden elements is usually necessary in order to be able to fix the wooden dowels in a stable manner.

It is the object of the present invention to provide a further flat dowel and a wooden structure.

The object according to the invention can be achieved by the flat dowel with the features of claim 1 and the wooden structure with the features of claim 8.

The flat dowel according to the invention for connecting at least two wooden elements to one another comprises at least a first section and a second section. The sections are arranged such that they can rotate relative to one another about an axis of rotation. In each case one section is designed for at least partial introduction into the wooden elements to be connected to one another or for anchoring therein.

The axis of rotation is optional. In addition to it, or instead of an axis of rotation, the two sections can be angled to one another at an angle that is not equal to 0 ° or 180 °.

The wooden structure according to the invention (it can be a piece of furniture or a window frame, for example) has at least a first wooden element and a second wooden element. The two wooden elements are by means of at least one flat anchor according to the invention, for. B. rotatable or non-rotatable, connected to each other.

Advantageous further developments of the present invention are each the subject matter of subclaims and embodiments.

In all of the following statements, the use of the expression “can be” or “can have” etc. is to be understood as synonymous with “is preferably” or “preferably” etc. and is intended to explain embodiments according to the invention.

Whenever numerical words are mentioned here, the person skilled in the art understands them to indicate a numerically lower limit. If this does not lead to a contradiction that is recognizable to the person skilled in the art, the person skilled in the art therefore always reads “at least one” or “at least one” when indicating “a” or “an”. This understanding is also encompassed by the present invention, as is the interpretation that a numerical word such as “a” can alternatively be meant as “exactly one” wherever this is technically possible for the person skilled in the art. Both are encompassed by the present invention and apply to all numerical words used herein.

When an embodiment is mentioned herein, what is meant is an exemplary embodiment according to the present invention.

Embodiments according to the invention can have one or more of the features mentioned below in any combination, provided that such is not recognizable as technically impossible for the person skilled in the art.

In some embodiments, the sections of the flat dowel according to the invention are arranged to be rotatable or rotated relative to one another between 0 ° and 90 ° or angled in some other way. The rotation can take place continuously or in steps, for example in 1 °, 5 °, 10 ° or in other degrees.

In some embodiments, the flat dowel therefore has no sections that are rotatably arranged with respect to one another.

In some embodiments, the flat dowel is rigid and / or in one piece, which can make its production cost-effective and gives it a particularly high level of stability compared to the embodiment with an axis of rotation.

What is stated herein about embodiments with an axis of rotation, in particular with regard to the advantages that can be achieved, also applies to embodiments without an axis of rotation or rotating device, provided that this is not discernible for a person skilled in the art.

In some embodiments, wooden elements that or their surface are to be arranged at an angle between 0 ° and 90 ° to one another can be connected to one another by means of the flat dowel according to the invention. For this purpose, in a first processing step, the surfaces or end faces of the wooden elements to be connected can be chamfered to one another according to the desired angle, so that the surfaces, end faces or their cut surfaces that are created in this way rest directly on one another as support surfaces. As explained above, this arrangement can be referred to as a miter. The angle of the support surfaces can be referred to as the miter angle. For example, if two wooden elements are to be connected at an angle of 90 ° to each other, the miter angle is 45 °. If the angle of the two wooden elements to be connected is 45 °, the miter angle is 22.5 °.

Then, in a second processing step, grooves extending parallel to the surfaces of the wooden elements can be incorporated, in particular by means of milling, which are to be dimensioned at least or precisely according to the dimensions of the sections of the flat dowel to be received therein. If, for example, the flat dowel has a thickness, which can be referred to as the thickness of the flat dowel, of approx. 4 mm, a corresponding milling cutter, for example with an oversize of 4 mm, is selected and a groove is milled with it. With a miter angle of 45 °, the groove is milled at an angle of 45 ° to the front of the wooden element.

In the third processing step, the flat dowels according to the invention can be inserted into the two wooden elements or their grooves at an exemplary miter angle of 45 °. This can be done by gluing the flat dowel in the grooves and / or on the end faces of the wooden elements. The two sections of the flat dowel according to the invention are rotated through 45 ° to one another. The flat dowels can then no longer be visible from the outside, since they are completely inserted into the grooves that receive them.

Due to the optional parallel arrangement of the grooves and thus the alignment of the sections of the flat dowel according to the invention, thin wooden elements can also be connected to one another easily and securely at an angle. With a thickness of z. B. approx. 4 mm of the flat dowel, wooden elements from a panel thickness of approx. 6 mm can be connected to one another. The wall thickness between the grooves and the respective plate surface would be approx. 1 mm in this case.

The flat dowel can, for example, be glued and / or fixed with a material fit or non-positive fit in the grooves by means of a press fit. By means of the flat dowel according to the invention, an inclined milling of the grooves can advantageously be avoided, with “oblique” being understood as a non-parallel milling to the surface of the wooden element. An inclined milling would be necessary if the flat dowel did not have any rotatable sections.

Further influencing factors for the possible minimization of the panel thickness of the wooden elements to be connected at an angle include the subsequent load on the connection and the stability of the wood-based material selected for the wooden elements.

In some embodiments, the sections of the flat dowel according to the invention have a surface profile. In this way, gluing and / or a press fit of the flat dowel in the groove which is intended to receive the flat dowel can advantageously be supported. The surface profile can, for example, have a groove profile. For example, the glue can spread in the grooves. The grooves can be aligned in such a way that the open groove ends are oriented into the interior of the milling groove so that an excess amount of glue does not escape to the visible surface.

In some embodiments, the flat dowel according to the invention has at least two swivel joints. The swivel joints can be implemented, for example, by two spherical sections arranged along the axis of rotation, which are guided in corresponding spherical caps. By arranging the spherical cap depressions opposite in relation to the axis of rotation, the swivel joint can be easily mounted mechanically. Instead of a spherical segment-spherical cap joint, the joint can be designed by means of pin tips that are guided in a bore, similar to a tip mounting.

One or more swivel joints for rotating the sections of the flat dowel according to the invention can be referred to as a hinge.

In some embodiments, the sections of the flat dowel according to the invention are connected to one another by means of at least one connecting web. The connecting bar is optionally designed as a flexible, thin central bar. The sections can be angled to one another by rotating about the axis along the connecting web. Since this rotation, in particular only for Aligning the flat dowel, the wooden elements angled to one another are usually only carried out once, this mechanical material load on the connecting web can be tolerated.

In some embodiments, the outer contour of the flat dowel or at least one of its sections has an oval shape in a plan view, the sections having an angle of rotation of 0 ° to one another, that is to say not being angled to one another. The oval shape can be called a lens shape. The oval shape can have an axis of symmetry so that the two sides are mirror images of the same. The axis of symmetry corresponds in particular to the axis of rotation of the two sections of the flat dowel.

In some embodiments, the sections are partially or completely made of metal, of plastic, of a composite material and / or of wood.

In some embodiments, some or all of the foregoing or following advantages are achievable.

By means of the flat dowel according to the invention, wooden elements can advantageously be connected to one another at any desired miter angle at angles from 0 ° to 90 °. Due to the rotatable arrangement of the two sections to each other, a milling for the grooves for inserting the flat dowel or of the two sections of the flat dowel can always be carried out parallel to the surface of the wooden element, for example a surface of a shelf or a plate, regardless of the angle of the miter. This advantageously enables stable anchoring of the wooden dowel in the wooden elements.

The flat dowel according to the invention advantageously enables thin panels to be connected, for example panels with a panel thickness of approx. 6 mm or more, with the panels being able to have a miter angle between 0 ° and 90 °.

The flat dowel according to the invention advantageously enables simple milling of the groove for introducing the flat dowel perpendicular to the surface or at an angle of 90 ° to the end face. The front side can be referred to as the edge of the wooden element to be glued. This is advantageous in making work easier compared to a necessary inclined milling, as is required in the case of a flat dowel without rotatably arranged sections. A level support of the milling cutter (for milling the groove) on a work table is advantageously more stable and therefore more precise and safer to handle.

The articulated flat dowel according to the invention advantageously represents a stabilizing connecting means and a gluing aid with which the position of the abutting edges of the wooden elements to be connected can be locked exactly.

By means of the flat dowel according to the invention, connections of wooden elements in the form of a so-called “edge on edge connection” (for example the two end faces of two wooden panels) or a so-called “edge on board connection” (for example a connection of a panel end face to a surface of another panel) can be used A miter angle of 0 ° to 45 ° can advantageously be easily connected to one another.

• 1 zeigt eine erste Ausführungsform eines erfindungsgemäßen Flachdübels mit einer Drehgelenksanordnung in einer 0°-Position (0 Grad) in einer Aufsicht und in einer Seitenansicht;
• 2 zeigt eine zweite Ausführungsform eines erfindungsgemäßen Flachdübels mit einem Verbindungssteg in einer 0°-Position in einer Aufsicht und in einer Seitenansicht;
• 3 zeigt die erste Ausführungsform des erfindungsgemäßen Flachdübels in einer Einbauposition in zwei Holelementen in einer 45°-Position in einer Schnittdarstellung;
• 4 zeigt die erste Ausführungsform des erfindungsgemäßen Flachdübels in einer 0°-Position in perspektivischer Ansicht;
• 5 zeigt die Ausführungsform der 4 in einer 90°-Position in perspektivischer Ansicht; und
• 6 zeigt die zweite Ausführungsform des erfindungsgemäßen Flachdübels mit einem Verbindungssteg in einer ca. 20°-Position in perspektivischer Ansicht.

The method according to the invention is described below on the basis of preferred embodiments thereof with reference to the figures of the attached drawing. The figures show:

• 1 shows a first embodiment of a flat dowel according to the invention with a swivel joint arrangement in a 0 ° position (0 degrees) in a top view and in a side view;
• 2 shows a second embodiment of a flat dowel according to the invention with a connecting web in a 0 ° position in a top view and in a side view;
• 3 shows the first embodiment of the flat anchor according to the invention in an installation position in two hol elements in a 45 ° position in a sectional view;
• 4th shows the first embodiment of the flat anchor according to the invention in a 0 ° position in a perspective view;
• 5 shows the embodiment of 4th in a 90 ° position in a perspective view; and
• 6th shows the second embodiment of the flat anchor according to the invention with a connecting web in an approximately 20 ° position in a perspective view.

The present invention is not limited to the embodiments described above, these are for illustration purposes only.

1 shows a first embodiment of a flat anchor according to the invention 100 with a swivel assembly 1 in a 0 ° position (angle of rotation α is 0 degrees; α = 0 °) in a top view (left) and in a side view (right).

The flat dowel 100 optionally has a substantially oval shape. It includes a first section 3 and a second section 5 , both around a (here optional: common) axis of rotation 7th are arranged rotatably to each other. The sections 3 , 5 are essentially, except for their design in the area of the swivel joint arrangement 1 , optionally mirror-symmetrical.

The swivel assembly 1 can for example by means of a spherical cap arrangement in the form of a plain bearing, which is shown in 1 is not visible in detail.

The two sections 3 , 5 have an optional groove profile 9 on. This can be used, for example, to apply or pick up glue or to support a press fit.

In the side view (right) is the exemplary cross-sectional shape of the flat dowel 100 visible. The angle of rotation α = 0 ° is made clear in this view.

2 shows a second embodiment of the flat anchor according to the invention 100 with a connecting web 11 in a 0 ° position in a top view (left) and in a side view (right).

In this embodiment, the two sections 3 , 5 by means of the connecting web 11 instead of the swivel assembly 1 in 1 around the axis of rotation 7th turned.

3 shows the first embodiment of the flat anchor according to the invention 100 in one installation position in two wooden elements 13th in a 45 ° position (angle of rotation α = 45 °) in a sectional view. The miter angle is approx. 22.5 °.

The two wooden elements 13th are on their front sides 15th by means of the flat dowel 100 connected and fixed together.

Strength can be purely exemplary B1 of the flat anchor according to the invention 100 approx. 4 mm and plate thickness B2 of the wooden element 13th each approx. 10 mm.

The longitudinal orientation or main extension plane of the sections 3 , 5 of the flat dowel 100 is exemplarily parallel to the surface O of the wooden elements 13th oriented.

4th shows the first embodiment of the flat anchor according to the invention 100 the 1 with the swivel assembly 1 in a 0 ° position in a perspective view. The arrows 17th indicate the direction of rotation of the two sections 3 , 5 at.

5 shows the embodiment of the flat anchor according to the invention 100 the 4th in a 90 ° position (angle of rotation α = 90 °) in perspective view.

The arrows 17th interpret in 5 the direction of rotation of the two sections 3 , 5 in which the two sections 3 , 5 in the starting position α = 0 ° could be turned back.

6th shows the second embodiment of the flat anchor according to the invention 100 out 2 with the connecting bridge 11 in an approx. 20 ° position (angle of rotation α = 20 °) in perspective view. The arrows 17th indicate the direction of rotation of the two sections 3 , 5 around the axis of rotation 7th at.

List of reference symbols

100

Flat dowels

1

Swivel assembly

3

first section

5

second part

7th

Axis of rotation

9

Groove profile

11

Connecting bridge

13th

Wooden element

15th

Front side of the wooden element

17th

Arrows indicating the direction of rotation of the sections

α

Rotation angle

B1

Strength, thickness of the flat dowel

B2

Strength, thickness of the wood element

O

Surface of the wooden element

Claims (8)

Flat dowels (100) for connecting at least two wooden elements (13), comprising a first section (3) and a second section (5), the sections (3, 5) being arranged and / or rotatable relative to one another about an axis of rotation (7) are arranged angled to one another at an angle that is not equal to 0 ° or 180 °. Flat dowels (100) Claim 1 wherein the sections (3,5), at least or only, between 0 (zero degrees) and 90 ° (90 degrees), in particular steplessly, are rotatable relative to one another or are arranged at such an angle to one another. Flat dowels (100) Claim 1 or 2 , having at least one swivel joint arrangement (1), in particular a swivel joint arrangement (1) with two or more swivel joints. Flat dowels (100) according to one of the Claims 1 to 3 , wherein the sections (3, 5) are connected to one another by means of at least one connecting web (11) and the axis of rotation (7) is arranged along the connecting web (11). Flat dowel (100) according to one of the preceding claims, wherein the outer contour of the flat dowel (100) has an oval shape in a plan view, in particular with an axis of symmetry which corresponds to the axis of rotation (7), the sections (3, 5) having an angle of rotation ( a) from 0 ° to each other. Flat dowel (100) according to one of the preceding claims, wherein at least the sections (3, 5) are made partially or completely from metal, from plastic, from a composite material and / or from wood. Flat dowel (100) according to one of the preceding claims, wherein the sections (3, 5) have a surface profile, in particular a groove profile (9). Wooden construction, in particular furniture or window, with at least one first wooden element (13) and a second wooden element (13), both wooden elements (13) being connected to one another by means of a flat dowel (100) according to one of the preceding claims.

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