Housing for a mounting element for timber and building construction

Abstract

Housing for a mounting element for a pull rod, comprising a housing body (1, 19) having a top side (2) and a bottom side (3) into which a through-opening (8) having a central axis (9) opens, which runs through the housing body (1, 19), characterized in that the housing also has at least one receiving bore (11, 12, 21, 22, 23, 24) which runs between the top side (2) and the bottom side (3) in a plane (13, 14) which is at a distance from the central axis (9).

Description

[0001] The invention relates to a housing for a mounting element for a pull rod, with a housing body having a top side and a bottom side, into which a through-opening having a central axis opens and which runs through the housing body.

[0002] Mounting elements of the aforementioned type are known in the prior art. They are used, for example, to fasten staircases in a building or stair treads to a stringer: For this purpose, a horizontally oriented hole is drilled into a wall or the stringer. This hole accepts a dowel into which a pull rod, preferably with an external thread, is inserted. The stair tread is then placed onto this pull rod, for which purpose a blind hole is provided in the side of the tread. The aforementioned mounting element is inserted into this blind hole.

[0003] The through-hole contains a conical seat section that tapers conically in the axial direction and corresponds to at least two clamping jaws arranged to be displaceable in the through-hole, which move along the surface of the conical seat section in the radial and axial direction with sliding surfaces.

[0004] The pull rod, which is inserted into the through-hole of the mounting element, moves the clamping jaws axially, while they simultaneously move radially. The clamping jaws can be pre-tensioned against the insertion direction by an axial spring.

[0005] If a load in the form of tension is now applied to the connection between the drawbar and the clamping jaws, the clamping jaws attach themselves to the outside of the drawbar and slide with their sliding surfaces along the surface of the conical seat section, whereby they are simultaneously pressed radially inwards during the axial displacement against the insertion direction, so that they clamp the drawbar firmly.

[0006] In furniture construction, similar elements are sometimes used to firmly connect furniture parts such as side panels and crossbars of cabinets or shelves, or to connect table legs to a tabletop or table frame.

[0007] Another application that is particularly relevant here has emerged in prefabricated house construction. Here, prefabricated wall elements are connected to wooden ceilings using appropriate mounting elements, or they are attached to tie rods that are inserted vertically into concrete floors or foundation slabs, for example.

[0008] It is understandable that in prefabricated house construction, considerably greater forces act on the corresponding assembly elements than, for example, in staircase or furniture construction.

[0009] To account for these considerably greater forces, such assembly elements for prefabricated house construction are therefore dimensioned accordingly larger.

[0010] The known mounting elements, such as those shown in DE 20 2023 101 323 U1, are provided with cylindrical housings whose circumferential surface, between the top and bottom sides, is typically threaded. The mounting elements are screwed into a blind hole using this thread, thus fixing them axially. As is common practice in timber construction, this thread is self-tapping.

[0011] The aforementioned blind hole is brought into the wall element from a side edge, usually into a beam arranged there, which forms a horizontal sill on a lower side edge of the (erected) wall element.

[0012] In the industrial prefabrication of wall elements, these are manufactured while lying flat. Both the horizontal beams that form the sill at the bottom edge of the finished, erected wall and the vertically arranged beams that form the studs are aligned with each other on a horizontal assembly surface. A panel is then placed on the aligned beams. Staples are then driven through this panel into the beams, or screws are inserted, so that the beams are firmly connected to the panel and fixed in their relative positions.

[0013] As mentioned above, the forces acting on a wall element when it is installed in a prefabricated house are relatively large. Therefore, forces introduced into a wall element by a mounting element should preferably be transferred to the beams forming the studs within the wall element. This is achieved either by using separate brackets, particularly made of metal, to connect the stud beams to the sill beam, or by using special mounting elements, such as those known from DE 20 2023 104 888 U1, which are provided with a flat stop flange for direct attachment to the wooden stud beams.

[0014] However, the assembly of these brackets or special mounting elements presents certain problems in industrial manufacturing, as described above: To connect these brackets or the stop flanges of the special mounting elements to the beams forming the uprights, appropriate nails or screws must be inserted horizontally. Since the standard assembly systems described above are only designed for inserting clamps or screws vertically, these systems would need to be upgraded to accommodate this additional horizontal direction of operation.

[0015] Such an upgrade involves considerable effort in terms of both construction and cost.

[0016] Alternatively, the brackets or special mounting elements could also be installed manually. However, this would require interrupting the currently fully automated industrial assembly process of the wall elements. This could lead to undesirable disruptions in a timed manufacturing process.

[0017] The object of the present invention is therefore to further develop a mounting element and in particular its housing in such a way that it is suitable for assembly in the industrial production of wall elements even under the aforementioned boundary conditions.

[0018] This problem is solved according to the invention in that the housing of the mounting element, in addition to the through-opening through it, also has at least one receiving bore which runs between the top side and the bottom side and lies in a plane that is spaced apart from the central axis of the through-opening.

[0019] The invention has the advantage that the pull-out resistance required for the mounting element can now be achieved by inserting a fastening screw through the receiving bore. This fastening screw, with its threaded section protruding from the top side of the mounting element housing, engages in the wood material of the wall element adjacent to the mounting element, and in particular directly into the wooden studs forming the uprights. This eliminates the need for the previously required angles or flat stop flanges for special mounting elements, as described above.

[0020] Another advantage of the invention is that it now makes it possible to mount the mounting element only after the industrial manufacturing steps described above have been completed for a wall element.

[0021] From a manufacturing perspective, it is advantageous if the plane in which the receiving bore lies runs parallel to the central axis of the through-hole.

[0022] To further improve the transfer of forces from the fastening screw into the wooden material of the wall element surrounding the mounting element housing, it is proposed that the receiving hole be inclined relative to the through hole. This will cause the fastening screw to be tilted relative to the vertical direction when installed, so that when loaded, the forces acting upon it will subject it not only to tension but also to bending and shear forces.

[0023] When multiple mounting holes are present, only some may be inclined. In this case, it is suggested that the housing be provided with an alignment mark so that the mounting element can be installed correctly.

[0024] The aforementioned plane containing the mounting hole can also have an additional inclination relative to the central axis of the through-hole, thereby further improving the force transmission from the fastening screws passing through the mounting hole into the wood surrounding the mounting element. An inclination of less than 10°, preferably around 5°, has proven particularly suitable. In this case, it is essential that the distance between the plane containing the mounting hole and the through-hole is maintained across the height of the housing, i.e., the distance between the top and bottom surfaces.

[0025] In a particularly preferred embodiment of the invention, the housing according to the invention for a mounting element is essentially cuboid in shape and provided with flat end faces.

[0026] As explained above, during industrial prefabrication of the wall elements, they are manufactured lying flat. This has the additional benefit that standard openings in the wall, e.g., for light switches or sockets, can be created from above, for example, using a router, into the horizontally lying wall element.

[0027] A blind hole, which is made into the wall element from a side edge as described for a mounting element, is then made from the side - i.e. not from above - into the wooden beam that later forms the sill of the wall element in this type of industrial production.

[0028] Regarding a fully industrialized manufacturing process, the aforementioned problem arises again: not only is a separate tool required, but this tool, especially a drill, must be oriented horizontally. Therefore, a machine tool, such as a gantry milling machine, as used for machining the horizontally arranged wall element, must be equipped with an additional machining axis, as explained.

[0029] A particularly noteworthy aspect is that the portal milling machines used in the prefabricated house industry are designed with a standard room height in mind. Drilling a horizontal hole into a side edge of a wall element is therefore not easily accomplished, as this would require positioning the tool in a location inaccessible to the machine.

[0030] The preferred embodiment of the invention, with a substantially cuboid housing for a mounting element and with flat end faces, has the advantage that a mounting element with a housing according to the invention can be inserted into a pocket machined into the edge of the wall element using a gantry milling machine. This ensures that the housing of the mounting element rests smoothly on the similarly flat bottom of the pocket provided in the wall element for the mounting element with one flat end face, and that the other flat end face transitions as smoothly as possible into the surface of the wall element.

[0031] Here too, the required pull-out resistance for the mounting element is achieved by inserting a fastening screw through the receiving hole. The threaded section of this fastening screw, protruding from the top side of the mounting element housing, then engages in the wooden material of the wall element surrounding the pocket.

[0032] It is understood that the pocket is preferably to be installed in an area where a vertically running beam forming a support in the (erected) wall element is connected to the wooden beam forming the sill of the wall element. This allows the fastening screw to transmit forces directly into the vertically running support, even in this embodiment.

[0033] The housing according to the invention, which is essentially cuboid in shape, has side walls that transition into the top of the housing with a radius of approximately 10-30 mm, preferably approximately 20 mm. This makes it possible to produce the pockets for the mounting element in a horizontal position during the industrial manufacturing of the wall element using a conventional milling tool, which is also used to create the other openings in the wall element, and then to insert the mounting element precisely into this pocket.

[0034] To reduce the manufacturing costs of the aforementioned mounting elements, it is proposed that the through-hole in the housing, adjacent to its mouth on the cover side, have a receptacle for an inlay. This inlay, which is preferably cylindrical in shape, has an axial bore in its interior, the central axis of which aligns with the central axis of the through-hole when the inlay is inserted into the receptacle. The inlay accommodates the clamping jaws and the axial spring that pre-tensions them in the axial direction of the inlay, so that the clamping jaws, with their sliding surfaces, move along the surface of the conical seat section, also located in the axial bore of the inlay, when, as described above, they interact with the pull rod as it moves through the through-hole of the housing and thus through the axial bore of the inlay.

[0035] Such an inlay can be manufactured in larger quantities and therefore cost-effectively. The clamping devices, which are crucial for the mounting elements, can thus also be used as prefabricated assemblies for various mounting elements.

[0036] Further advantages and features of the invention will become apparent from the following description of exemplary embodiments. These will show Fig. 1 a perspective view of a preferred embodiment of the housing, Fig. 2 a bottom view of the housing according to Fig. 1; Fig. 3 a sectional view through the housing according to Fig. 1 along the middle plane III - III in Fig. 2; Fig. 4 a sectional view through the housing according to Fig. 1 along line IV - IV in Fig. 2; Fig. 5 a sectional view through the housing according to Fig. 1 along line V - V in Fig. 2; Fig. 6 a perspective view of another embodiment of the housing, Fig. 7 a sectional view through the housing according to Fig. 6 along the middle plain VII - VII in Fig. 9; Fig. 8 a sectional view through the housing according to Fig. 6 along line VIII - VIII in Fig. 9; Fig. 9 a top view of the housing according to Fig. 6; Fig. 10 a bottom view of the housing according to Fig. 6, Fig. 11 A sectional view through an inlay for use with one of the housings.

[0037] In the Fig. Figure 1 shows a housing for a mounting element in a perspective view from above. This housing has a housing body 1 with a top side 2 and a bottom side 3. The two end faces 4, 5 and the two side walls 6, 7 abut the bottom side 3. The housing body 1 is essentially cuboid in shape.

[0038] The housing body 1 contains a [unclear text] in the Fig. 3 visible through-openings 8 were introduced. Fig. Figure 3 is a sectional view through the housing body 1 along the center line III - III in Fig. 2, wherein Fig. Figure 2 shows a bottom view of the housing body 1.

[0039] The through-hole 8 opens into the top side 2 of the housing body 1 and into the bottom side 3 of the housing body 1.

[0040] The through-opening 8 has a central axis 9 and is stepped into several sections. When the mounting element is used, it receives clamping jaws (not shown) which connect to a pull rod (also not shown) that is inserted into the through-opening 8 along the central axis 9 via the conical end adjacent to the bottom side 3. The clamping jaws can be pre-tensioned by a spring (not shown).

[0041] It is also possible, in principle, for the clamping jaws and the spring to be integrated into an inlay (not shown here), for which a receptacle 17 is provided in the through-opening 8 at its end adjacent to the cover side 2. This receptacle is preferably circular and also has a groove 18 into which a snap ring (not shown) can be inserted, if necessary, to fix the inlay axially in the receptacle 17.

[0042] In order to attach a mounting element to a component, such as a wall element of a prefabricated house, two receiving bores 11, 12 are provided in the housing body 1 in the embodiment shown here.

[0043] These receiving bores 11, 12 extend (with their central axes not shown) in planes 13, 14, which are spaced from the central axis 9 of the through-opening 8. These planes 13, 14 are shown as sectional views along line IV-IV and line V-V, respectively. Fig. 2 each in the Fig. 4 or 5 are shown.

[0044] It can be seen that the receiving bores 11, 12 have an angle 15 of greater than 90° with respect to the bottom side 3 of the housing body 1. Since the central axis 9 of the through-opening 8 is essentially at a right angle with respect to the bottom side 3, the receiving bores 11 and 12 are therefore inclined with respect to the central axis 9 of the through-opening 8.

[0045] If 11 screws are now passed through the receiving holes, they will also have an inclination at an angle 15 to the central axis of the through-hole 8.

[0046] When forces are exerted on the housing body 1 via the (not shown) tie rod along the central axis 9, these forces are not transmitted by the screws, which are guided through the receiving bores 11, 12, as purely tensile forces, but also as shear or bending forces. This results in better anchoring of the housing to a component.

[0047] It should also be noted that the side walls 6 and 7 transition into the top side 2 of the housing body 1 at their upper ends with a radius 16. This radius is in the range of 10 to 30 mm, preferably around 20 mm. In contrast to this radiused transition between the side walls 6, 7 and the top side 2, the transition from the end faces 4, 5 to the top side 2, as well as the transitions from the end faces 4, 5 and side walls 6, 7 to the bottom side 3, are designed to be as sharp-edged as possible.

[0048] In the Fig. Figure 6 shows an alternative embodiment of a housing body 19 in a perspective view from below. This housing body 19 also has a top side 2 and a bottom side 3.

[0049] The housing body 19 is preferably circular, designed as a turned part, and has a centrally arranged through-opening 8 with a [missing information] in the Fig. 7 and Fig. The central axis 9 shown in Figure 8 is also shown. In this embodiment, the through-opening 8 also has a conical end 10, which is arranged on the bottom side 3, and a circular receptacle 20 at its end facing the top side 2. In the embodiment shown here, however, the receptacle 20 is relatively flat, so that an inlay, as described above, is not fully inserted into the receptacle 20, but is only placed into the receptacle 20 with one end section and thus fixed against the housing body 19.

[0050] It can also be seen that the housing body 19 is also provided with through openings 21, 22, 23, 24, each extending from the bottom side 3 to the top side 2.

[0051] Of these four receiving bores, the two receiving bores 21 and 22 run parallel to the through-opening 8 with its central axis 9, while the other two receiving bores 23 and 24 are arranged with their center lines inclined relative to the central axis 9. The planes in which the center lines of the receiving bores 23 and 24 lie can be arranged either parallel to the central axis 9 or have a slight inclination of, for example, 5° to it, whereby the distance between these planes and the central axis 9 is ensured over the height of the housing body 19, i.e., the distance between the bottom side 3 and the top side 2.

[0052] During the Fig. 1-5 where the housing body 1 shown is placed into a pocket which has been milled into a side surface of a wall element (with respect to an upright wall) at its edge, a housing body 19 is to be inserted into a (circular) bore which has been made into the underside of a wall element (again with respect to an upright wall).

[0053] If this bore is located in the area of ​​a stud running within the wall element, the fastening screws guided through the receiving bores 21 to 24 engage with their threaded sections, particularly in the end faces of this stud, and thus transfer a significant portion of the forces acting on the housing body 19 directly into this stud in the desired manner. The risk of forces being transmitted solely to the beam at the lower end of the wall element, acting as a sill, can therefore be avoided. It is also possible, if necessary, to design this sill as a simple board.

[0054] It should also be noted that the housing body 19 is provided with alignment markings 25 on its bottom side 3, which allows a mounting element to be aligned in such a way as to ensure that all fastening screws inserted through the mounting holes 21 to 24 are securely screwed into the adjacent stand.

[0055] To facilitate the alignment of the housing body 19, flat sections can optionally be provided on its circumferential edge in diametrically opposed areas. These sections run parallel to each other and allow the housing body to be rotated about the central axis 9 using an open-end wrench of a suitable size, which engages these flat sections. This embodiment is not shown here.

[0056] In the Fig.Figure 11 shows a cross-section of an inlay, showing how it can be inserted into the opening 17 or placed on top of the opening 20.

[0057] This inlay has a cylindrical base body 27 into which a continuous axial bore 28 is provided. At its lower end (in the drawing), this axial bore is provided with a conical section 29 on which clamping jaws 30 arranged in the inlay are movable axially downwards or upwards and simultaneously radially inwards or outwards via sliding surfaces 31 provided on them.

[0058] By means of an axial spring 32, which in this embodiment is designed as a coil spring and is supported against a safety plate 33, the clamping jaws 30 are pre-tensioned downwards and thus inwards.

[0059] If a pull rod is now inserted into the axial bore 28 from below, the pull rod pushes the clamping jaws 30 upwards and thus simultaneously outwards, and can therefore pass between the clamping jaws.

[0060] When the pull rod is then moved in the opposite direction (or the inlay is moved upwards in the drawing when the pull rod is fixed), the clamping jaws are moved downwards and thus inwards, whereby this movement causes the clamping jaws 30 to clamp more firmly to the pull rod. The axial spring 32 applies a preload for this downward and inwards movement.

[0061] A significant advantage of such an inlay is that it can be manufactured in larger quantities separately from the housings described above, thus achieving a cost advantage.

[0062] For the sake of completeness, it should be noted that the diameter of the cylindrical base body corresponds approximately to that of the mounts 17 or 20, so that a precise fit between the inlay and the housing bodies can be achieved.

[0063] In summary, it can be stated that housings for quick-mounting elements, as described here, make the use of such elements easier and safer. Reference symbol list 1 Housing body 2 Cover page 3 bottom side 4 Front 5 Front 6 side wall 7 Side wall 8 Through opening 9 Central axis 10 conical end 11. Intake bore 12 Mounting hole Level 13 Level 14 15 angles 16 radius 17th entry 18 Nut 19 Housing bodies 20 recordings 21 Intake bore 22 Mounting hole 23 Intake bore 24 Mounting hole 25 alignment marker 26 Inlay 27 cylindrical base bodies 28 Axial bore 29 Cone section 30 clamping jaws 31 sliding surfaces 32 Axial spring QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2023 101 323 U1

[0010] DE 20 2023 104 888 U1

[0013]

Claims

Housing for a mounting element for a pull rod, comprising a housing body (1, 19) having a top side (2) and a bottom side (3) into which a through-opening (8) having a central axis (9) opens, which runs through the housing body (1, 19), characterized in that the housing also has at least one receiving bore (11, 12, 21, 22, 23, 24) which runs between the top side (2) and the bottom side (3) in a plane (13, 14) which is at a distance from the central axis (9). Housing according to claim 1, characterized in that the receiving bore (11, 12, 23, 24) is inclined relative to the through-opening (8). Housing according to claim 1, characterized in that the plane (13, 14) is parallel to the central axis (9). Housing according to claim 1, characterized in that the plane has an inward inclination relative to the central axis (9). Housing according to one of the preceding claims, characterized in that it has at least one alignment mark (25) on the bottom side (3). Housing according to one of claims 1 or 2, characterized in that the housing is provided with flat end faces (4, 5). Housing according to claim 5, characterized in that the housing has side walls (6, 7) which transition into the top side (2) with a radius (16). Housing according to claim 6, characterized in that the radius (16) is between 10 - 30 mm, preferably 20 mm. Housing, in particular according to one of the preceding claims, characterized in that it has a receptacle (20) for an inlay (26) which has inside the clamping jaws (30) and a conical section (29) along the surface of which the clamping jaws (30) slide with sliding surfaces (31). Housing according to claim 9, characterized in that an axial spring (32) is provided in the inlay (26) which preloads the clamping jaws (30) in the axial direction of the inlay.

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