DE102008010606A1 - Fastening element for wood fiber insulation panels - Google Patents

Abstract

The invention relates to a fastening element (1) for wood fiber insulating panels with a holder element (2), which has an insulating thread (13) with a thread core (14), and a fastening means (3). In order to provide a fastening element (1) which is easy to manufacture and suitable for wood fiber insulation panels, the invention proposes that the thread core (14) of the holder element (2) has at least a factor of 1.5 greater outside diameter (DK) as the fastening means (3) and the maximum outer diameter (DD) of the insulating thread (13) at least by a factor of 1.4 and a maximum of a factor of 2.5, in particular by a factor of 1.4 to 1.75, is greater than that Outer diameter (DK) of the threaded core (14) of the holder element (2).

Description

The The invention relates to a fastener for Holzfaserdämmplatten with the features of the preamble of claim 1.

fasteners for fixing insulation boards to a substructure are used, for example, in external thermal insulation systems (ETICS) used to insulation boards on building walls to fix.

Such a fastener is from the document DE 10 2004 062 151 A1 known. 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 publication EP 1 783 300 A2 shows another fastener with a dowel as a fastener 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 design of the insulation material thread, with two radially projecting from the threaded core of the insulation thread threaded portions is designed for easy insertion of the holder element in the insulation material. 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 in this case is concrete or masonry.

typically, become relatively soft in external thermal insulation systems Insulating boards made of foamed polystyrene or out Mineral wool 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 panels are unsuitable because they are due to their soft insulating material trained insulating thread in Holzfaserdämmplatten are not screwed. In addition, the fasteners described are due to their special geometry or manufacturing process consuming in the production and thus relatively expensive.

task The invention is therefore to propose a fastener, the easy to manufacture and for wood fiber insulation boards suitable is.

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. According to the invention, the thread core of the holder element has a maximum outer diameter, which is larger by at least a factor of 1.5, than the attachment means in its fastening region. It is meant with the attachment region of the anchoring serving part of the fastening means. This makes it possible to realize a simple and inexpensive construction of the fastening element, since the fastening means are thus inserted, for example via a receptacle in the holder element in the longitudinal direction in the holder element and can be held in rotation 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 transmit a torque between the screw and holder element then a corresponding remaining wall thickness of the holder element is 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 1.4 times and at most 2.5 times, in particular 1.4 to 1.75, larger than the outer diameter of the thread core of the holder element. 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, outer diameter is to be understood as meaning the diameter of a circle which 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.

Prefers the insulation thread is designed as a pointed thread is and has a flank angle of 10 ° to 20 °, in particular of 15 °. The insulation thread may also be only partially executed as a pointed thread. Due to the special thread shape of the Eindrehwiderstand in the Wood fiber insulation board greatly reduced. A simple assembly the fastener is thus possible. In addition allows such a thread, the holder element cost in plastic. A high screwing resistance would shear loads between the flanks and the core of the Produce insulation thread that in a holder element made of plastic would cause a shearing of the flanks.

at a preferred embodiment of the invention Fastener corresponds to the diameter of the insulation thread minimal 0.6 times the length of the holder element and at most its 1.2 times, 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 thread in a wood fiber insulation board.

The Insulating thread of the holder element has in a preferred Embodiment a first threaded portions, the extends around half the circumference of the threaded core of the holder element. Preferably, on the insulation thread of the holder element a second threaded portion at a distance in the direction of the longitudinal axis arranged to the first threaded portion. The distance between the both thread sections corresponds to the thread pitch, that the threaded sections in the same threads engage in the wood fiber insulation board and cut into the insulation board Do not destroy the thread. The preferred distance between the end of the first threaded portion and the beginning of the second Threaded section corresponds essentially to 1.0 times the thread pitch. That means that between the two threaded sections a threaded section is omitted, which extends around the entire circumference the thread core of the insulation thread extends.

A preferred embodiment has an insulation thread with an outer diameter of that in the insertion direction in the insulation board facing front first end to the rear second Gets bigger at the end. In one embodiment with a substantially cylindrical threaded core this means that the radial extent of the thread flanks of the individual threaded sections from the first front end of the insulation thread to the second towards the back. This ensures that that in particular the threaded portions at the rear end to the carrying capacity of Contribute holder element. In addition, this means that the front End attached threaded sections a smaller radial extent have a threaded portion of the subsequent threaded portion a part of thread in the Holzfaserdämmplatte pre-cuts and therefore the screwing resistance of the holder member during the entire driving operation uniformly low remains. This is additionally supported by that the radial extent of a threaded portion is preferably from his beginning in the direction of introduction to his in the insertion towards the rear end, so contrary the screwing direction, increases. Preferably, the threaded portion ends with a radial to the thread core of the insulation thread extending edge.

The Fastening element has in a preferred embodiment of Invention an end face at its in the insertion direction on the back end. In particular, the end face arranged on the holder element. The end face is for example circular shaped. Preferably, it has an outer diameter at least as large as the maximum outer diameter the insulation thread. The end face prevents that the fastener inserted too far in the insulation board becomes. It also covers the opening into which the fastener was introduced. Is not the end face formed circular, so means outer diameter the diameter of a circle circumscribing the end face.

In A preferred embodiment is the holder element made of thermally insulating plastic. For further reduction the thermal conductivity, the holder element preferably a receptacle for a closure element. Especially when the holder member has an opening for passage having the fastener, and thus, for example, a Metal screw engages in the holder element, the closure element acts as thermal insulation against the screw. moreover the closure element can be designed such that it has fastening means fixed in the direction of the longitudinal axis of the fastener. In addition, the closure element can be a receptacle for a tool, for example, have a screw bit.

The invention is described below with reference to four embodiments explained in more detail.

It demonstrate:

1 a first inventive fastener for wood fiber insulation panels in a perspective sectional view;

2 a second inventive fastener for Holzfaserdämmplatten in a perspective view;

3 a third inventive fastener for wood fiber insulation panels in a perspective sectional view; and

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

1 shows a first inventive fastener 1 with a holder element 2 , a fastener 3 and a closure element 4 , The fastener 3 is a screw in this case 5 with a tip pointing in the insertion direction 6 , a threaded area 7 with a screw thread 8th , a screw shaft 9 and a hexagon head 10 with a trained as Innentorx first tool holder 11 for a tool not shown, for example a bit. The threaded area 7 and the screw shaft 9 together form the fastening area of the screw 5 , The hexagon head 10 the screw 5 engages in a recording 12 of the holder element 2 and is covered by this. The holder element 2 is designed as an injection molded part in plastic, with an insulation thread 13 and a threaded core 14 which is at its front end in the insertion direction 15 a conical area 16 has a cylindrical area at the 17 followed. The insulation thread 13 is designed as a pointed thread with a flank angle α of 15 °. The thread core 14 of the holder element 2 has a larger by a factor of 1.5 maximum outer diameter D _K as the fastener 3 with a maximum outer diameter D _B in the fastening area of the screw 5 , In addition, the maximum outer diameter D _{D of} the insulation thread 13 by a factor of 1.5 greater than the maximum outer diameter D _{K of} the thread core 14 of the holder element 2 , The maximum outer diameter D _{D of} the insulation thread 13 corresponds to 0.75 times the length L _{H of} the holder element 2 , The holder element 2 closes at its rear end in the insertion direction 18 with a radially outwardly extending end face 19 which is configured circular, and has an outer diameter D _T , the maximum outer diameter D _{D of} the insulation material thread 13 equivalent. The recording 12 penetrates the holder element along its longitudinal axis completely and is formed in its rear in the insertion direction as a hexagon socket, so that the introduced screw 5 with hexagon head 10 rotatably with the holder element 2 connected is. The hexagon socket can be designed so that the recording 12 also usable as a tool holder. In its front area is the recording 12 designed as a bore whose diameter to the maximum outer diameter D _{B of} the fastener 3 in the attachment area corresponds. Due to the ratio of the maximum outer diameter D _{K of} the thread core 14 the insulation thread 13 to the maximum outer diameter D _{B of} the fastener 3 is a sufficiently large wall thickness t of the holder element 2 available. Due to the special design of the insulation thread 13 can be the fastener 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 wooden substructure. To assemble the wood fiber insulation board is the screw 5 of the fastener 1 screwed through the Holzfaserdämmplatte in the substructure. The holder element 2 is by screwing in the screw 5 led to Holzfaserdämmplatte out, so in the insertion. By the rotationally fixed connection of the holder element 2 and the screw 5 the insulation thread turns 13 of the holder element 2 also in the wood fiber insulation board. The thread pitch in the screw 5 corresponds to the thread pitch of the insulation thread 13 , causing the screw 5 and the holder element 2 is introduced with the same propulsion in the wood fiber insulation board or the substructure. It is also conceivable that the thread pitch of the holder element 2 slightly smaller than the thread pitch of the screw 5 is, which is achieved when screwing the fastener 1 the insulation board is clamped against the substructure, as the screw thread 8th per revolution in the axial direction further moved than the insulation thread 13 , Once the end face 19 rests against the outside of the insulation board, this increases for screwing the fastener 1 necessary torque, 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 insulation materials which have similar properties as wood fiber insulation panels. For thermal insulation is the holder element 2 executed in plastic. To improve the thermal insulation, before or after mounting the fastener 1 the recording 12 through a closure element 4 be closed. The illustrated closure element 4 points to the lock in the recording 12 rectangular locking elements 20 on that in grooves 21 can snap in along the circumference in the outer wall of the picture 12 are arranged. The closure element 4 also has a second tool holder 22 on. Due to the special geometry of the holder element 2 very high holding forces can be realized. In addition, the fastener 1 easy to manufacture and therefore inexpensive.

To avoid repetition is in the following description of the other embodiments only to the differences from the fastener 1 from the 1 To be received.

2 shows a fastener 1' with a holder element 2 ' and a screw 5 ' as a fastener 3 ' in a dowel 23 engages, for example, for anchoring in a concrete wall, not shown. The holder element 2 ' has no closure element and no end face. The insulation thread 13 ' has several threaded sections 24 each extending half the circumference of the thread core 14 of the holder element 2 ' extend. Two threaded sections each 24 are at a distance in the direction of the longitudinal axis of the fastener 1' arranged. 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 threaded section following in the screwing direction 26 corresponds to a thread pitch of the insulation thread 13 ' , The insulation thread 13 ' has an outer diameter from its first end 15 to his second end 18 gets bigger. The individual threaded sections 24 take in their radial extent from the beginning of the threaded portion 24 to the end of the threaded section 24 , ie contrary to the direction of insertion too. The threaded sections 24 ends at its end with a radial to the thread core 14 the insulation thread 13 ' extending edge 27 , As the fastener 1' does not have a pronounced end face, it is possible the holder element 2 ' to be recessed in a wood fiber insulation board, not shown. The screw 5 ' has no tool holder. Therefore, the recording is used 12 of the holder element 2 ' as a tool holder.

In the third embodiment in 3 grab the screw 5 '' of the fastener 1'' in a dowel 23 '' one. To the holder element 2 '' closes in the insertion a tubular, cylindrical section 28 , which is designed so that its outer diameter in the insertion direction in the rear part 29 of the dowel 23 '' is telescopically insertable. The tubular section 28 protects the screw 5 before corrosion.

In 4 is another fastener 1''' represented, in which the dowel 23 ''' and the holder element 2 ''' are integrally formed. The screw 5 ''' has a round head 30 with a tool holder 11 ''' for screwing in the screw 5 ''' in the dowels 23 ''' on. For mounting an insulation board with the fastener 1''' First, a holes introduced through the insulation board in the substructure. The substructure is for example a concrete. The nominal diameter of the hole corresponds to the nominal diameter of the anchor 23 ''' , The fastener 1 is introduced in such a way that first the dowel 23 ''' is inserted into the bore. Once the holder element 2 ''' , whose outer diameter is greater than the outer diameter of the anchor 23 ''' is, the insulation board touched, there is the further insertion of the fastener 1 by a rotational movement, causing the insulation thread 13 cuts into the insulation and causes the necessary for the insertion process propulsion. The torque required for this is on the recording 12 from an assembly tool not shown on the fastener 1''' transfer. The insertion process is terminated when the conical area 16 of the holder element 2 ''' rests against the substructure, resulting in the screwing of the fastener 1''' necessary torque significantly increased. It is also conceivable the screw 5 ''' and the holder element 2 ''' connect with each other so that through the first tool holder 11 ''' also for screwing in the holder element 2 ''' necessary torque on the fastener 1''' is transferable. For example, this rotationally fixed connection via a predetermined breaking point, which is designed so that it is for screwing in the holder element 2 ''' can transmit necessary torque into the insulation board. At an increase in the screwing of the fastener 1 necessary torque, for example, when the holder element 2 ''' rests against the substructure, the predetermined breaking point fails, so that no rotationally fixed connection between the holder element 2 ''' and screw 5 ''' more is available. The screw 5 ''' is then in the dowel 23 ''' screwed in, which is thereby spread and fixed in the substructure.

1, 1 ', 1' ', 1' ''

fastener

2, 2 ', 2' ', 2' ''

holder element

3, 3 ', 3' ', 3' ''

fastener

4

closure element

5, 5 ', 5' ', 5' ''

screw

6

Tip of the screw 5 . 5 ' . 5 '' . 5 '''

7, 7 ', 7' ', 7' ''

Thread area of the screw 5 . 5 ' . 5 '' . 5 '''

8th

Screw thread of the screw 5 . 5 ' . 5 '' . 5 '''

9 9 ', 9' ', 9' ''

screw shaft

10 10 ''

Hex head

11 11 '' '

first tool holder

12

admission

13 13 '

insulation thread

14

thread core

15

front end of the holder element 2 . 2 ' . 2 '' . 2 '''

16

conical area of the holder element 2 . 2 ' . 2 '' . 2 '''

17

cylindrical portion of the holder element 2 . 2 ' . 2 '' . 2 '''

18

rear end of the holder element 2 . 2 ' . 2 '' . 2 '''

19

end face

20

locking element

21

groove

22

second tool holder

23 23 '', 23 '' '

dowel

24

threaded sections

25

first threaded portion

26

second threaded portion

27

radial edge

28 28 '' '

tubular section

29

rear part of the dowel 23 ''

30

Risso

D _K

maximum outer diameter of the thread core 14 the insulation thread 13 . 13 '

D _D

maximum outer diameter of the insulation thread 13 . 13 '

D _B

maximum outer diameter of the fastener 3 . 3 ' . 3 '' . 3 ''' in the attachment area

D _T

Outer diameter of the end face 19

L _H

Length of the holder element 2 . 2 ' . 2 '' . 2 '''

α

Flank angle of the insulation thread 13

t

Wall thickness of the holder element 2 . 2 ' . 2 '' . 2 '''

a

Distance between two threaded sections 25 . 26 in the direction of the longitudinal axis of the fastener 1 . 1' . 1'' . 1'''

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102004062151 A1 [0003]
• - EP 1783300 A2 [0004]

Claims (16)

Fastening element ( 1 . 1' . 1'' . 1''' ) for Holzfaserdämmplatten with a holder element ( 2 . 2 ' . 2 '' . 2 ''' ), which is 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 at least a factor of 1.5 larger maximum outer diameter (D _K ) than the fastening means ( 3 . 3 ' . 3 '' . 3 ''' ) in its attachment area ( 7 . 9 . 7 ' . 9 ' . 7 '' . 9 '' . 7 ''' . 9 ''' ) and the maximum outer diameter (D _D ) of the insulation thread ( 13 ) is at least a factor of 1.4 and a maximum of a factor of 2.5, in particular by a factor of 1.4 to 1.75, greater than the maximum outer diameter (D _K ) of the thread core ( 14 ) of the holder element ( 2 . 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 °. Fastening element according to claim 1 or 2, characterized in that the maximum outer diameter (D _D ) of the insulating thread ( 13 ) at least 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. 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 ''' ) a first threaded portion ( 25 ), which is around half the circumference of the threaded core ( 14 ) of the holder element ( 2 . 2 ' . 2 '' . 2 ''' ). Fastening element according to claim 4, characterized in that the insulating thread ( 13 ) of the holder element ( 2 . 2 ' . 2 '' . 2 ''' ) a second threaded portion ( 26 ), which is at a distance (a) in the direction of the longitudinal axis to the first threaded portion ( 25 ) is arranged. 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 threaded portion ( 25 ) and the beginning of the second thread section ( 26 ) substantially equal to 1.0 times the thread pitch. Fastening element according to one of claims 1 to 6, characterized in that the insulating thread ( 13 ) has an outer diameter (D _D ), which from a front in the insertion direction first end ( 15 ) to a rear second end ( 18 ) becomes larger. 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. 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 radial to the threaded core ( 14 ) of the insulation thread ( 13 ) extending edge ( 27 ) ends. 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 ) having. Fastening element according to claim 10, characterized in that the outer diameter (D _T ) of the end face ( 19 ) at least as large as the maximum outer diameter (D _D ) of the insulating thread ( 13 ). Fastening element according to one of claims 1 to 11, characterized in that the holder element ( 2 . 2 ' . 2 '' . 2 ''' ) consists of plastic. Fastening element according to one of claims 1 to 12, characterized in that the holder element ( 2 . 2 ' . 2 '' . 2 ''' ) a recording ( 12 ) for a closure element ( 4 ) having. 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. Fastening element according to one of claims 1 to 14, characterized in that the fastening means ( 1 . 1' . 1'' . 1''' ) a screw ( 5 . 5 ' . 5 '' . 5 ''' ). Fastening element according to one of claims 1 to 15, characterized in that the holder element ( 2 ''' ) with a dowel ( 23 ''' ) is integrally connected.