EP2245317A1

EP2245317A1 - Fastening element for wood-fibre insulating boards

Info

Publication number: EP2245317A1
Application number: EP09711653A
Authority: EP
Inventors: Jürgen Renz
Original assignee: Fischerwerke GmbH and Co KG
Current assignee: Fischerwerke GmbH and Co KG
Priority date: 2008-02-22
Filing date: 2009-01-21
Publication date: 2010-11-03
Also published as: DE102008010606A1; WO2009103391A1

Abstract

The invention relates to a fastening element (1) for wood-fibre insulating boards comprising a holder element (2), which has an insulating material thread (13) with a thread core (14), and a fastening means (3). In order to provide a fastening element (1) which is simple to produce and suitable for wood-fibre insulating boards, the invention proposes that the thread core (14) of the holder element (2) has an external diameter (D?) which is greater at least by a factor of 1.5 than the fastening means (3), and the maximum external diameter (DD) of the insulating material thread (13) is greater at least by a factor of 1.4 and at most by a factor of 2.5, in particular by a factor of 1.4 to 1.75, than the external diameter (D?) of the thread core (14) of the holder element (2).

Description

description

Fastening element for wood fiber insulation panels

The invention relates to a fastening element for wood fiber insulation panels with the features of the preamble of claim 1.

Fastening elements for fastening insulation boards to a substructure are used, for example, in thermal insulation composite systems (ETICS) to fasten insulation boards to building walls.

Such a fastener is known from the document DE 10 2004 062 151 A1. The fastening element has a fastening means and a holder element. The fastening means is, for example, a screw to which the holder element is molded, and with which the fastening element and thus the insulating board to a substructure, such as a wooden beam, can be anchored. The holder element is designed as insulating thread with a large outer diameter and a threaded core, which can be screwed into the insulation board. It cuts when screwing so in the insulation board that a power transmission between the insulation board and holder element is guaranteed.

The document EP 1 783 300 A2 shows a further fastening element with a dowel as a fastening means and a holder element. The holder element is designed to be more continuous as insulating thread, wherein the threaded portions are arranged symmetrically about the threaded core. The special embodiment of the insulation thread, with two radially projecting from the Gewindekem of the insulation thread threaded portions is designed for easy insertion of the holder element in the insulation. The fastener is screwed into the insulation board so that the dowel is inserted into a pre-drilled in the substructure hole and jammed in it. As a result, a power transmission from the insulation board in the substructure is possible. The substructure is in this case

Concrete or masonry. Typically, in thermal insulation composite systems relatively soft insulation boards made of foamed polystyrene or mineral wool are used. New are insulation boards made of wood fibers, which have a dense and hard structure compared to polystyrene. It has been found that those known from the prior art

Fasteners for wood fiber insulation boards are unsuitable because they are not screwed due to their trained for soft insulation material insulation thread in wood fiber insulation boards. In addition, the fasteners described due to their special geometry or their manufacturing process consuming in the production and thus relatively expensive.

The object of the invention is therefore to propose a fastener that is easy to manufacture and suitable for wood fiber boards.

This object is achieved by the features of claim 1. The fastening element according to the invention has a holder element with an insulating thread and a threaded core and a fastening means. The fastening element extends along a longitudinal axis, which is also the longitudinal axis of the insulation material thread. The fastener and the holder member may be rotatably connected to each other, an additional axially fixed

Connection is also possible. The threaded core of the holder element according to the invention has an at least by a factor of 1, 5 larger maximum outer diameter than the fastening means in its mounting region. It is meant with the attachment region of the anchoring serving part of the fastening means. This makes it easier and cheaper

Realize the structure of the fastener, since the fastening means thus be inserted for example via a receptacle in the holder member in the longitudinal direction in the holder element and can be rotatably held by a corresponding design of the fastener and the recording in the recording. The fastening means is, for example, a screw but can also be a nail, a clamping sleeve, a sieve sleeve or the like. The fastening element may be formed in several parts or integrally connected to the holder element. For example, a screw with hexagonal head by a recording in the holder element in the longitudinal direction can be inserted and rotatably connected by a corresponding shape of the recording with the holder element. To transfer a

Torque between the screw and holder element is then a corresponding remaining wall thickness of the holder element necessary. In this case, the outer diameter of the thread core does not have to be constant, but it can, for example, rise counter to the insertion direction of the fastening element. According to the invention, moreover, the maximum outer diameter of the insulation material thread is at least a factor of 1, 4 and a maximum of a factor of 2.5, in particular around the

Factor 1, 4 to 1, 75 larger than the outer diameter of the threaded core of the holder member. With this ratio of the outer diameter of the insulation material thread to the outer diameter of its thread core large forces can be transferred from a Holzfaserdämmplatten on the holder element without the screwing resistance of the holder element is too large. Basically is under

Outside diameter of the diameter of a circle to understand that circumscribes the corresponding component, regardless of whether the component itself is circular. The radius of this circle is radial to the longitudinal axis of the fastener, wherein the center of the circle lies on this longitudinal axis. Without departing from the spirit of the invention, it is possible that the holder element engages in a dowel or is integrally connected to a dowel.

Preferably, the insulation thread is designed as a pointed thread and has a flank angle of 10 ° to 20 °, in particular of 15 °. The insulation thread can also be performed only partially as a pointed thread. Due to the special thread form, the insertion resistance in the wood fiber insulation board is greatly reduced. A simple installation of the fastener is thus possible. In addition, such a thread allows to carry out the holder element inexpensively in plastic. A high insertion resistance would produce shear loads between the flanks and the core of the insulation thread, which in a plastic holder element to a

Shearing the flanks would result.

In a preferred embodiment of the fastener according to the invention, the diameter of the insulation thread corresponds to a minimum of 0.6 times the length of the holder element and at most its 1, 2-fold, in particular its 0.7 to 0.9 times, length. This special embodiment leads to an optimal combination of a good bearing behavior of the holder element and a low insertion resistance of the insulation material thread into a wood fiber insulation board.

The insulating material thread of the holder element has, in a preferred embodiment, a first threaded portion which extends around half the circumference of the threaded core of the holder element extends. Preferably, a second threaded portion is arranged at a distance in the direction of the longitudinal axis to the first threaded portion of the insulating material thread of the holder member. The distance between the two threaded portions corresponds to the thread pitch, that the threaded portions engage in the same threads in the wood fiber insulation board and do not destroy the cut into the insulation board thread. The preferred distance between the end of the first threaded portion and the beginning of the second threaded portion is substantially equal to 1.0 times the thread pitch. That is, between the two threaded portions a threaded portion is omitted, which extends around the entire circumference of the thread core of the insulation material thread.

A preferred embodiment has an insulation thread with an outer diameter, which increases from the front first end pointing in the insertion direction in the insulation board towards the rear second end. At a

Embodiment with a substantially cylindrical Gewindekem means that the radial extent of the thread flanks of the individual threaded portions from the first front end of the insulation thread increases toward the second rear end. This ensures that, in particular, the threaded sections at the rear end contribute to the load-bearing capacity of the holder element. In addition, this means that the attached at the front end threaded portions have a smaller radial extent, that a threaded portion of the subsequent threaded portion pre-cuts a portion of thread in the wood fiber insulation board and therefore the insertion resistance of the holder member throughout the driving remains uniformly low. This is additionally supported by the fact that the radial extent of a

Thread section preferably from its front in the insertion direction beginning to its rear end in the insertion direction, ie counter to the insertion direction, increases. Preferably, the threaded portion ends with a radial edge extending to the thread core of the insulation material thread.

In a preferred embodiment of the invention, the fastening element has an end face at its rear end in the insertion direction. In particular, the end face is arranged on the holder element. The end face is, for example, circular. Preferably, it has an outer diameter which is at least as large as the maximum outer diameter of the insulation material thread.

The end face prevents the fastener from getting too far into the insulation board is introduced. It also covers the opening into which the fastener was inserted. If the end face is not circular, the outside diameter is the diameter of a circle circumscribing the end face.

In a preferred embodiment, the holder element is made of thermally insulating

Made of plastic. To further reduce the thermal conductivity, the holder element preferably has a receptacle for a closure element. In particular, when the holder element has an opening for the passage of the fastening means, and thus engages, for example, a metal screw in the holder element, the closure element acts as a thermal insulation against the screw. In addition, the closure element may be designed such that it fixes the fastening means in the direction of the longitudinal axis of the fastening element. In addition, the closure element may have a receptacle for a tool, for example for a screw bit.

The invention will be explained in more detail with reference to four embodiments.

Show it:

Figure 1 shows a first inventive fastener for

Holzfaserdämmplatten in a perspective sectional view;

Figure 2 shows a second inventive fastener for

Holzfaserdämmplatten in a perspective view;

Figure 3 shows a third inventive fastener for

Holzfaserdämmplatten in a perspective sectional view; and

Figure 4 shows a fourth inventive fastener for wood fiber insulation panels in a perspective sectional view.

FIG. 1 shows a first fastening element 1 according to the invention with a holder element 2, a fastening means 3 and a closure element 4. The fastening means 3 in this case is a screw 5 with a point 6 pointing into the insertion direction, a threaded area 7 with a screw thread 8

Screw shank 9 and a hexagonal head 10 with a trained as Innentorx first tool holder 11 for a tool, not shown, for example, a bit. The threaded portion 7 and the screw shank 9 together form the fastening region of the screw 5. The hexagonal head 10 of the screw 5 engages in a receptacle 12 of the holder element 2 and is encompassed by this. The holder element 2 is designed as an injection molded part in plastic, with a

Insulating thread 13 and a threaded core 14, which has a conical region 16 at its front end 15 in the insertion direction, to which a cylindrical region 17 adjoins. The insulation thread 13 is designed as a pointed thread with a flank angle α of 15 °. The Gewindekem 14 of the holder member 2 has a by a factor of 1, 5 larger maximum outer diameter D _κ than that

Fixing means 3 having a maximum outer diameter D _B in the fastening area of the screw 5. Moreover, the maximum outer diameter D _D of the insulating thread 13 by a factor of 1, 5 is larger than the maximum outer diameter D _κ of the threaded core 14 of the holder element 2. The maximum outer diameter D _D of the Insulating material thread 13 corresponds to 0.75 times the length L _{H of} the holder element 2. The holder element 2 terminates at its rear end 18 in the insertion direction with a radially outwardly extending end face 19, which is circular in shape, and an outer diameter D ₁ - has, which corresponds to the maximum outer diameter D _{D of} the insulating thread 13. The receptacle 12 completely penetrates the holder element along its longitudinal axis and is formed in its rear region in the insertion direction as a hexagon socket, so that the introduced screw 5 with hexagonal head 10 is non-rotatably connected to the holder element 2. The hexagon socket can be designed so that the receptacle 12 is also usable as a tool holder. In its front region, the receptacle 12 is designed as a bore whose diameter corresponds to the maximum outer diameter D _{B of} the fastening means 3 in the attachment region. Due to the ratio of the maximum outer diameter D _{κ of} the threaded core 14 of the insulating material thread 13 to the maximum outer diameter D _{B of} the fastening means 3, a sufficiently large wall thickness t of the holder element 2 is present. Due to the special design of the insulation material thread 13, the fastener can be

1 relatively easy and easy to screw in a wood fiber insulation board, not shown. For assembly, the wood fiber insulation board can be glued to a substructure or even just be laid. The fastener 1 is designed for example for a substructure made of wood. For mounting the wood fiber insulation board, the screw 5 of the fastener 1 through the wood fiber insulation board in the

Substructure screwed. The holder member 2 is by screwing in the Screw 5 led to Holzfaserdämmplatte out, so in the insertion. Due to the rotationally fixed connection of the holder element 2 and the screw 5, the insulation thread 13 of the holder element 2 also rotates in the wood fiber insulation board. The thread pitch in the screw 5 corresponds to the thread pitch of the insulation material thread 13, whereby the screw 5 and the holder element 2 with the same

Propulsion in the wood fiber insulation board or the substructure is introduced. It is also conceivable that the thread pitch of the holder member 2 is slightly smaller than the thread pitch of the screw 5, which ensures that when screwing the fastener 1, the insulation board is clamped against the substructure, since the screw thread 8 per revolution in the axial direction continues to move As soon as the end face 19 bears against the outside of the insulation board, the torque necessary for screwing in the fastening element 1 increases, whereby the setting process is terminated. Without departing from the spirit of the invention, a fastener according to the invention can also be used for fastening further insulating materials, the like

Have properties such as wood fiber insulation panels. For thermal insulation, the holder element 2 is made of plastic. In order to improve the thermal insulation, the receptacle 12 can be closed by a closure element 4 before or after assembly of the fastening element 1. The closure element 4 shown has for locking in the receptacle 12 rectangular locking elements 20 which are in grooves

21 can engage, which are arranged along the circumference in the outer wall of the receptacle 12. The closure element 4 also has a second tool holder 22. Due to the special geometry of the holder element 2 very high holding forces can be realized. In addition, the fastener 1 is easy to manufacture and thus inexpensive.

In order to avoid repetition, only the differences from the fastening element 1 from FIG. 1 will be discussed below in the description of the further exemplary embodiments.

Figure 2 shows a fastener 1 'with a holder element 2' and a screw 5 'as a fastening means 3', which engages in a dowel 23, for example, for anchoring in a concrete wall, not shown. The holder element 2 'has no closure element and no end face. The insulation material thread 13 'has a plurality of threaded portions 24, each about half the circumference of the

Threaded core 14 of the holder member 2 'extend. Two threaded sections 24 each are arranged at a distance in the direction of the longitudinal axis of the fastening element V. The distance a in the direction of the longitudinal axis between the end of a first threaded portion 25 and the beginning of a second, following in screwing, threaded portion 26 corresponds to a thread pitch of the insulation material thread 13 '. The insulating thread 13 'has an outer diameter which increases from its first end 15 to its second end 18. The individual threaded portions 24 take in their radial extent from the beginning of the threaded portion 24 to the end of the threaded portion 24, ie against the screwing towards. The threaded portions 24 terminate at their end with a radially to the threaded core 14 of the insulation material thread 13 'extending edge 27. Da

Fastening element 1 'has no pronounced end face, it is possible to secure the holder element 2' sunk in a wood fiber insulation board, not shown. The screw 5 'has no tool holder. Therefore, the receptacle 12 of the holder member 2 'serves as a tool holder.

In the third exemplary embodiment in FIG. 3, the screw 5 "of the fastening element 1" engages in a dowel 23 "." In the insertion direction, a tubular, cylindrical section 28 adjoins the retaining element 2 ", which is designed so that its outside diameter fits into the inward-facing Insertion direction rear portion 29 of the dowel 23 "telescopically inserted .The tubular portion 28 protects the screw 5 in front

Corrosion.

4 shows a further fastening element 1 '", in which the dowel 23'" and the holder element 2 '"are formed in one piece The screw 5'" has a round head 30 with a tool holder 11 '"for screwing in the screw 5'. " in the

Dowel 23 '"on. For mounting an insulating board with the fastener 1'" is first introduced a holes through the insulation board in the substructure. The substructure is for example a concrete. The nominal diameter of the bore corresponds to the nominal diameter of the plug 23 "." The fastening element 1 is introduced in such a way that first the plug 23 '"is inserted into the bore.

Once the holder member 2 '"whose outer diameter is larger than the outer diameter of the anchor 23'", touches the insulation board, the further insertion of the fastener 1 by a rotary movement, whereby the insulation material thread 13 is cut into the insulation material and necessary for the insertion process Propulsion causes. The torque required for this purpose is on the recording 12 by a mounting tool, not shown on the The insertion process is terminated when the conical region 16 of the holder element 2 '"rests against the substructure, as a result of which the torque required for screwing in the fastening element 1'" increases significantly '"and the holder element 2'" to be connected to each other so that by the first tool holder 1 1 "'and the

Turning the holder element 2 '"necessary torque on the fastener 1'" is transferable. For example, this non-rotatable connection is made via a predetermined breaking point, which is designed such that it can transmit the torque necessary for screwing in the holder element 2 '"into the insulating panel

Torque, for example, when the holder element 2 '"rests against the substructure fails, the predetermined breaking point, so that no rotationally fixed connection between the holder element 2'" and screw 5 '"is longer present .. The screw 5'" is then in the dowel 23rd '"screwed, which is thereby spread and fixed in the substructure.

LIST OF REFERENCES

Fastening element for wood fiber insulation panels

1, 1 ', 1 ", 1'" fastener

2, 2 ', 2 "holder element

3, 3 ', 3 "fasteners

4 closure element

5, 5 ', 5 ". 5 ¹ " screw

6 tip of the screw 5, 5 ', 5 ", 5'"

7, T, 7 ", 7 '" threaded portion of the screw 5, 5', 5 ", 5 '"

8 screw threads of the screw 5, 5 ', 5 ", 5"'

9, 9 ', 9 ", 9'" screw shank

10, 10 "hex head

11, 11 '"first tool holder

12 recording

13, 13 'insulating thread

14 threaded core

15 front end of the holder element 2, 2 ', 2 "

16 conical region of the holder element 2, 2 ', 2 ", 2'"

17 cylindrical area of the holder element 2, 2 ', 2 ", 2"'

18 rear end of the holder element 2, 2 ', 2 ",

19 end face

20 locking element

21 groove

22 second tool holder

23,, 23 ", 23 '" dowels

24 threaded sections

25 first threaded section

26 second threaded portion

27 radial edge

28, 28 '"tubular section 29 rear part of the dowel 23 "

30 round heads

D _κ maximum outer diameter of the thread core 14 of the

Insulation thread 13, 13 'D _D maximum outer diameter of the insulation thread 13, 13'

D ₆ maximum outer diameter of the fastener 3, 3 ', 3 ", 3'" in the attachment area

D _τ outer diameter of the end face 19

L _H length of the holder element 2, 2 ', 2 ", 2'" α flank angle of the insulation material thread 13 t wall thickness of the holder element 2, 2 ', 2 ", 2'" a distance between two threaded portions 25, 26 in the direction of

Longitudinal axis of the fastening element 1, 1 ', 1 ", 1'"

Claims

claims

1. fastening element (1, 1 ', 1 ", 1"') for Holzfaserdämmplatten with a holder element (2, 2 ', 2 ", 2'") having an insulating thread (13) with a threaded core (14), and a fastening means (3, 3 ', 3 ", 3'"), wherein the fastening element (1, 1 ', 1 ", 1"') extends along a longitudinal axis, characterized in that the threaded core (14) of the holder element ( 2, 2 ',

2 ", 2 '") has a maximum outer diameter (D _K ) which is greater by at least a factor of 1.5 than the fastening means (3, 3', 3 ", 3 '") in its fastening region (7, 9, 7', 9 ', 7 ", 9", 7'", 9 '") and the maximum outer diameter (D _D ) of the insulation material thread (13) at least by a factor of 1, 4 and a maximum of a factor of 2.5, in particular by the factor 1.4 to

1, 75, is greater than the maximum outer diameter (D _κ ) of the threaded core (14) of the holder element (2, 2 ¹ , 2 ", 2 '").

2. Fastening element according to claim 1, characterized in that the insulating thread (13) has a pointed thread with a flank angle (α) of at least 10 ° and a maximum of 20 °, in particular with a flank angle (α) of 15 °.

3. Fastening element according to claim 1 or 2, characterized in that the maximum outer diameter (D _D ) of the insulating thread (13) minimally

0.6 times the length (L _H ) of the holder element (2, 2 ', 2 ", 2'") and a maximum of 1, 2 times, in particular 0.7 to 0.9 times the length (L _H ) of the holder element (2, 2 \ 2 ", 2 '") corresponds.

4. Fastening element according to one of claims 1 to 3, characterized in that the insulating thread (13) of the holder element (2, 2 ', 2 ", 2'") has a first threaded portion (25) which extends around half the circumference of Threaded core (14) of the holder element (2, 2 ', 2 ", 2'") extends.

5. Fastening element according to claim 4, characterized in that the

Insulation thread (13) of the holder element (2, 2 ', 2 ", 2'") a second Threaded portion (26) which is arranged at a distance (a) in the direction of the longitudinal axis to the first threaded portion (25).

6. Fastening element according to claim 5, characterized in that the distance (a) in the direction of the longitudinal axis between the end of the first

Thread portion (25) and the beginning of the second threaded portion (26) substantially equal to 1, 0 times the thread pitch.

7. Fastening element according to one of claims 1 to 6, characterized in that the insulating thread (13) has an outer diameter

(D _D ) which becomes larger from a first end (15) in the insertion direction to a rear second end (18).

8. Fastening element according to one of claims 1 to 7, characterized in that the radial extent of a threaded portion (24) increases from its beginning to its end.

9. Fastening element according to one of claims 4 to 8, characterized in that at least one of the threaded portions (24, 25, 26) with a radially to the threaded core (14) of the insulating thread (13) extending

Edge (27) ends.

10. Fastening element according to one of claims 1 to 9, characterized in that the fastening element (1), in particular the holder element (2), an end face (19).

11. Fastening element according to claim 10, characterized in that the outer diameter (D _τ ) of the end face (19) is at least as large as the maximum outer diameter (D _D ) of the insulating thread (13).

12. Fastening element according to one of claims 1 to 11, characterized in that the holder element (2, 2 ', 2 ", 2'") consists of plastic.

13. Fastening element according to one of claims 1 to 12, characterized in that the holder element (2, 2 ', 2 ", 2'") has a receptacle (12) for a closure element (4).

14. Fastening element according to one of claims 1 to 13, characterized in that the fastening element (1, 1 ', 1 ", 1'") is formed in several parts.

15. Fastening element according to one of claims 1 to 14, characterized in that the fastening means (1, 1 ', 1 ", 1'") is a screw (5, 5 ¹ , 5 ", 5 '").

16. Fastening element according to one of claims 1 to 15, characterized in that the holder element (2 '") with a dowel (23'") is integrally connected.