DE202023101323U1 - Mounting element for timber and building construction - Google Patents

Abstract

Mounting element for a tie rod with a sleeve-like, essentially cylindrical housing (1) which has an axially running through-opening (2) with a cone-seat section (13) tapering conically in the axial direction and which can be displaced in the axial direction with at least two in the through-opening ( 2) arranged clamping jaws (11) which move with sliding surfaces (12) along the surface of the conical seat portion (13) in radial and axial direction, characterized in that the surface of the housing (1) is provided with a friction-reducing layer.

Description

The invention relates to a mounting element for a pull rod, with a sleeve-like, essentially cylindrical housing, which has an axially running through-opening with a conical seat section that tapers conically in the axial direction, which corresponds to at least two clamping jaws that are arranged in the through-opening so as to be displaceable in the axial direction Sliding surfaces move along the surface of the cone seat section in radial and axial directions.

Devices of this type are known in the prior art. They are used, for example, to fasten stairs in a building or steps in a stringer: For this purpose, a horizontally running hole is then drilled into a wall or the stringer. This takes a dowel, in which a pull rod provided in particular with an external thread is introduced. The stair step is then attached to this pull rod, for which purpose a blind hole is made in the side of this step. The mounting element mentioned is inserted in this blind hole.

The tie rod, which is inserted into the through-opening of the mounting element, moves the clamping jaws there in the axial direction, while at the same time deviating in the radial direction. The clamping jaws can be biased against the direction of insertion by an axial spring.

If a load in the form of a train is now applied to the connection between the tie rod and the clamping jaws, the clamping jaws rest against the outside of the tie rod and slide with their sliding surfaces along the surface of the conical seat section, whereby they also move radially during the axial displacement against the direction of insertion pushed inward so that they clamp the drawbar.

Corresponding elements are also sometimes used in furniture construction to firmly connect furniture parts such as side walls and cross boards, e.g. of cupboards or shelves, or also table legs with a table top or table frame.

Another application has now emerged in prefabricated house construction. Here, prefabricated wall elements are connected to wooden ceilings using appropriate assembly elements or attached to tie rods, which are also installed in the vertical direction, for example in concrete floors or foundation slabs made of concrete.

It is understandable that in prefabricated house construction in particular, significantly greater forces act on the corresponding assembly elements than, for example, in staircase or furniture construction.

In order to take these significantly larger forces into account, such mounting elements for prefabricated house construction are therefore correspondingly larger in size.

Now, however, it is the case that the assembly elements on the outside of the housing are usually provided with a thread, with which they are screwed into the blind hole and are thus fixed in this in the axial direction. Such a thread is designed to be self-tapping, as is generally the case in timber construction.

However, it has now been found that, due to the significantly larger dimensions, screwing the sleeve-like housing into a beam at the lower edge of a wall, for example, requires disproportionately higher forces than with the products previously used in stair or furniture construction, so that the installation of corresponding quick-assembly elements is significantly more difficult higher expenditure of force and, as a result, either a higher use of apparatus or equipment or very large tools required in order to be able to muster the corresponding forces. The use of corresponding quick-assembly elements is thus significantly more complex.

It is therefore the object of the present invention to reduce such difficulties for the installation of quick assembly elements.

This object is achieved according to the invention in that the surface of the housing is provided with a friction-reducing layer.

The invention is based on the finding that the problems described above when installing the quick-mounting elements are essentially related to the relatively high coefficient of friction between the metal used for the housing of the quick-mounting element for durability reasons, on the one hand, and the wood into which the quick-mounting element is screwed, on the other hand.

By using a friction-reducing layer according to the invention, this coefficient of friction can be influenced in such a way that the installation of a quick-mounting element can be carried out by a user without any problems, even with relatively little effort and thus also with normal tools.

Since the friction-reducing layer is present in particular on the outside of the housing, but also covers the surface of the through-hole, another advantage of the invention is that the use of this friction-reducing layer forms a sliding layer with which the sliding layer in the axial direction conically tapering conical seat section is coated accordingly, whereby the effectiveness of the clamping elements is improved, since they are then easier to slide on this sliding layer with their sliding surfaces along the conical seat section.

In a particularly preferred embodiment, the friction-reducing layer is colored.

This has the advantage that the uniform application of the friction-reducing layer can be checked without any problems both on the inside and on the outside of the housing when installing the quick-mounting element. In addition, by choosing different colors, assembly elements of different types can be distinguished more easily by the user.

The use of such a color and sliding layer that completely covers the housing also ensures improved corrosion resistance of the mounting element over the long term.

If necessary, a separate anti-corrosion layer can also be applied for additional protection against corrosion. This then preferably lies under the colored layer or is itself designed in a correspondingly colored manner.

As mentioned, the housing can be provided with a thread on its outside. In order to achieve a limitation of the screw-in depth in this respect, it is proposed to provide the housing at its rear end in the screw-in direction with a radially outwardly projecting stop collar.

Without such a stop collar, a housing may also have an undesirable splitting effect in the element into which it is screwed when screwed in.

The aforesaid stop collar is preferably provided on its radially outer edge with an outer cutting edge that projects in the screwing-in direction.

As a result, a particularly smooth, in particular flush installation of the housing can be achieved since the cutting edge cuts through the uppermost layer of wood fibers of the beam into which the housing is screwed with precision. Without such a cutting edge, the wood fibers of this layer would only be crushed, which can also result in unwanted splitting or splintering, which is not only visually unattractive but also poses a risk of injury when handling the component provided with such a quick assembly element.

In order to facilitate the handling of such a component during the actual assembly, it is also proposed to provide the passage opening of the housing with a funnel-shaped insertion opening at its end opposite the conical seat section. As a result, a tie rod slides more easily into the through-opening when it and the quick-mounting element are brought together, and the assembly is considerably simplified as a result.

It is provided that a height nut can be screwed onto the pull rod in order to determine the depth to which the mounting element can be pushed onto the pull rod. This not only allows adjustments to be made as required, if height differences have to be compensated for when the wall element is placed on the tie rod fixed in a foundation or in a floor slab, but the height nut can also be used to distribute the pressure to be absorbed by the quick assembly element over a larger area that the specific load is advantageously reduced.

The vertical nut preferably has a height in the axial direction so that it protrudes from the insertion opening on the housing and, in this way, extends around the pull rod, in particular up to the foundation or the base plate. This means that higher shear forces can be absorbed in this area, and buckling loads that act on the pull rod can also be distributed more evenly.

• 1 die Prinzipskizze einer erfindungsgemäßen Vorrichtung in einer Schnittansicht,
• 2 eine an der erfindungsgemäßen Vorrichtung vorhandene Schnittkante in einer Vergrößerung;
• 3 eine mit der erfindungsgemäßen Vorrichtung verwendete Höhenmutter in perspektivischer Ansicht.

Further advantages and features of the invention result from the following description of an exemplary embodiment. while showing

• 1 the basic sketch of a device according to the invention in a sectional view,
• 2 a cutting edge present on the device according to the invention in an enlargement;
• 3 a vertical nut used with the device according to the invention in a perspective view.

In the 1 shows a quick assembly element in a sectional view. You can see an in Substantially cylinder housing 1, which is provided with an axially extending through-opening 2 having a substantially round cross-section.

On its circumference, the cylindrical sleeve has a thread 3.

The sleeve can thus be screwed into a suitable hole, for example in a wooden beam. For this purpose, the through-opening 2 of the sleeve has axially running grooves 5 in its central region, which are introduced into the wall 4 and distributed uniformly over the circumference. These grooves form a hexagon socket on which a hexagonal key that corresponds to them can engage in order to rotate the sleeve for screwing.

The housing 1 is screwed so deep into the hole that it comes into contact with a stop collar 7 protruding radially at the rear end 6 in the screwing-in direction on the upper side of the wooden beam. - This stop collar 7 is in the 2 shown in an enlarged detail drawing. It can be seen that the stop collar 7 has an outer cutting edge 8 projecting in the screwing-in direction on its radially outer edge.

When screwing in the sleeve, the stop collar 7 is first pressed against the upper side of the wooden beam with the outer cutting edge 8 projecting in the screwing-in direction. When screwed in further, this cutting edge then cuts through the uppermost layers of wood fiber of the wooden beam and then works its way into the areas underneath, with the cutting movement caused in this way creating a clean recess that closely surrounds the stop collar 7, so that finally the sleeve with the top of the on its rear end 6 located stop collar 7 flush with the surface of the beam.

It should also be mentioned that the sleeve-shaped housing 1 is provided with a friction-reducing layer both on its outside 9, which is provided with the thread 3, and on the wall 4 of the through-opening 2, which can be applied as a coating, e.g. galvanically or in a dip - or a spray painting or similar is applied.

On the outside, this friction-reducing layer makes it easier to screw the housing into a wooden component, for example into a wooden beam present at the lower edge of a wooden wall prefabricated in post-and-beam construction.

On the wall 4 of the passage opening 2, this friction-reducing layer fulfills several functions as a sliding coating.

On the one hand, it facilitates the insertion of a pull rod into the quick assembly element. On the other hand, it improves the subsequent fixation of the pull rod within the quick assembly element.

The tie rod is inserted into the quick assembly element when the component to be assembled, on which the quick assembly element is installed, is placed on a tie rod which is mounted in a foundation or a ceiling in a vertical direction.

This pull rod is inserted into a funnel-shaped insertion opening 10 at the end 6 of the through-opening 2 . The pull rod is guided through the funnel shape of the insertion opening 10 to the central axis of the through opening, which is facilitated by the friction-reducing layer. The front end of the pull rod (not shown here) then passes in the axial direction through the section in which the grooves 5 are made in the wall 4 of the through-opening and then meets at least two clamping jaws 11.

These clamping jaws 11 rest with sliding surfaces 12 on a conical seat section 13, which adjoins the section with the grooves 5 in the through-opening in the axial direction, the wall of the through-opening expanding in this section in the manner of a truncated cone.

The clamping jaws 11 are pressed by a coil spring 14 in the axial direction against the direction of insertion of the pull rod, with their sliding surfaces 12 sliding in the radial and axial direction along the surface of the conical seat section 13, which is facilitated by the friction-reducing layer applied to this.

The pull rod pushes the at least two clamping jaws 11 against the force of the helical spring 14 in the axial direction, and at the same time they slide radially outwards with their sliding surfaces 12 along the conical seat section 13 until the pull rod is passed between the clamping jaws 11, the through then apply the spring 14 preloaded clamping jaws 11 with the clamping surfaces 15 facing the pull rod on the outside of the pull rod.

In the example shown here, the clamping surfaces 15 have teeth that correspond to external teeth on the pull rod. This toothing can also be designed in the form of a helical thread.

When tensile forces are applied to the pull rod counter to the direction of insertion, the clamping jaws 11 are pulled into the conical seat section 13 and thus simultaneously pulled together, so that they exert a clamping force on the pull rod, so that the pull rod can be locked in this way.

The friction-reducing layer applied to the housing 1 in the through-opening 2 on the surface of the cone-seat section 13 facilitates this function and thus makes it more reliable.

On the tie rod, not shown here, a height nut 16 can be screwed, as shown in FIG 3 is shown.

Two different effects can be achieved with this: On the one hand, the screwing-on height of the screwed-on height nut can be used to determine how deep a pull rod is inserted into the through-opening 2 of the quick-action clamping element.

This insertion depth is limited by the fact that the screwed-on height nut strikes the wall of the funnel-shaped insertion opening 10 with its circumferential collar 17 with a truncated cone-like contour when the pull rod is inserted into the through-opening 2 .

On the other hand, given a corresponding height, this height nut can support the tie rod onto which it is screwed along this height and protect it against buckling or shearing.

In summary, it can thus be stated that the use of such elements becomes simpler and safer with a quick-mounting element, as is described here.

Reference List

1

Cylindrical body

2

passage opening

3

thread

4

wall

5

grooves

6

rear end

7

stop band

8th

cutting edge

9

outside

10

funnel-shaped insertion opening

11

jaws

12

sliding surfaces

13

cone seat surface

14

coil spring

15

clamping surfaces

16

height nut

17

collar

Claims (7)

Mounting element for a tie rod with a sleeve-like, essentially cylindrical housing (1) which has an axially running through-opening (2) with a cone-seat section (13) tapering conically in the axial direction and which can be displaced in the axial direction with at least two in the through-opening ( 2) arranged clamping jaws (11) which move with sliding surfaces (12) along the surface of the conical seat section (13) in the radial and axial direction, characterized in that the surface of the housing (1) is provided with a friction-reducing layer. Mounting element according to claim 1 , characterized in that the friction-reducing layer is colored Mounting element in particular according to one or more of the preceding claims, characterized in that it has a thread (3) on the outside of the housing and a radially projecting stop collar (7) on its one end (6). Mounting element according to claim 3 , characterized in that the stop collar (7) is provided on its radially outer edge with an outer cutting edge (8) projecting in the screwing-in direction. Mounting element according to one or more of the preceding claims, characterized in that the passage opening (2) of the housing (1) is provided with a funnel-shaped insertion opening (10) at its end (6) opposite the conical seat section (13). Device according to one or more of the preceding claims, characterized in that the insertion opening (10) corresponds to a vertical nut (16) which can be screwed onto the pull rod. Device according to claim 6 , characterized in that the elevation nut (16) has a has a peripheral collar (17) with a truncated cone-like contour at the bottom, which abuts against the wall of the funnel-shaped insertion opening (10) of the through-opening (2) when the pull rod is inserted into the through-opening (2).

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