Mounting aid for assembling door frames

Abstract

Described and claimed is an assembly aid for assembling door frames with four base elements. Each base element comprises two longitudinal rails for receiving lining boards of a door frame. Two of the four base elements also comprise a cross rail for receiving a lintel section of the door frame. The assembly aid can be converted from a transport configuration to a working configuration. In the transport configuration, the assembly aid has smaller spatial dimensions than in the working configuration. In the working configuration, the longitudinal rails of the base elements are aligned with one another, a distance between each two longitudinal rails corresponds to a standardized distance, and the cross rails are also aligned with another cross rail.

Description

[0001] The present invention relates to an assembly aid for assembling door frames.

[0002] Door frames, or simply frames, cover the walls surrounding or bordering doorways and other wall openings in buildings. These walls are also known as wall reveals or reveals for short. They can be used to attach door leaves. Not least because of their dimensions, door frames are usually delivered in individual parts and assembled, i.e. put together, in the immediate vicinity of their later installation location. In the simplest case, frames are made up of three parts: two side lining boards or reveal sections and a lintel section. The lining boards of an installed frame extend essentially vertically and are connected by the lintel section, which extends essentially horizontally. On some frames, the lining boards and the lintel section are attached to the sides and cover the transitions between the frame and the wall.

[0003] Assembling a frame is time-consuming even for an experienced carpenter, as the individual components of the frame are elongated and only connect to each other at the outermost edges in narrow contact areas. Even precisely aligning the lining boards, which are usually placed on the floor with their narrow long edges, and the lintel section at a 90° angle requires considerable time and several people or tools, as the lining boards, at least, are difficult to align due to their length, often 200 cm or more.

[0004] In addition, when assembling the frames on the floor, access to the transitions between the lining boards and the header section is difficult. The narrow long sides of the lining boards and header section, which rest on the floor, and the adjoining transitions between the lining boards and header section are outside the field of vision of the person assembling the frame. Therefore, the lining boards and header section must be connected in this area essentially without visual feedback, i.e., by touch.

[0005] Based on this background, the specialist is faced with the task of providing an assembly aid for a door frame that facilitates the connection of the lining boards and the lintel section of the door frame.

[0006] This object is achieved by an assembly aid according to claim 1. Preferred embodiments of the assembly aid are presented in the dependent claims.

[0007] In a first aspect, the present invention relates to an assembly aid for assembling door frames. The assembly aid comprises four base elements. Each base element comprises at least two longitudinal rails running parallel to one another for receiving a lining board of a door frame. At least two of the four base elements comprise a transverse rail for receiving a lintel section of a door frame. The base elements can be moved relative to one another in order to transfer the assembly aid from a transport configuration to a working configuration and from the working configuration to the transport configuration. In the transport configuration, the assembly aid has smaller spatial dimensions in at least one spatial direction than in the working configuration.In the working configuration, the base elements are positioned such that the longitudinal rails of all base elements run in a working plane and parallel to a longitudinal direction, such that the longitudinal rails of a first pair of base elements are aligned with one another to receive a first lining board of a door frame, such that the longitudinal rails of a second pair of base elements are aligned with one another to receive a second lining board of a door frame, such that a distance between each two longitudinal rails of the first pair of base elements and two longitudinal rails of the second pair of base elements perpendicular to the longitudinal direction corresponds to a standardized distance and such that the cross rail of a base element of the first pair of base elements is aligned with the cross rail of a base element of the second pair of base elements.

[0008] In other words, the present invention relates to an assembly aid that facilitates the assembly of door frames, or door frames for short. As already explained in the introduction, door frames are typically composed of at least three individual parts: two side lining boards and a lintel section connecting the two lining boards. The connection of these three individual parts of the door frame is made significantly easier by the present assembly aid.

[0009] The assembly aid initially comprises four base elements, each with at least two longitudinal rails for supporting the narrow sides or narrow long sides of the lining boards. The longitudinal rails can, for example, be U-shaped profiles or U-profiles attached to the base elements. In addition, at least two of the four base elements each have a cross rail, which can also be formed by U-shaped profiles. The cross rails extend essentially perpendicular to the longitudinal rails and are designed to accommodate the lintel section of the frame.

[0010] The four base elements are not permanently connected to one another, but can be moved relative to one another. The movement of the four base elements relative to one another serves to convert the assembly aid from a compact transport configuration to a working configuration. The transport configuration is intended for transporting the assembly aid, for example, in a vehicle or carrying it to a construction site where the door frame is to be assembled. This location is referred to below as the work site.

[0011] Once the work site has been reached, the assembly aid can be converted into the working configuration by moving the four base elements relative to each other. The specific arrangement of the four base elements, as well as the longitudinal and transverse rails arranged on the base elements, in the working configuration is explained in more detail below. Once the door frame has been fully assembled and installed in a wall opening, the assembly aid can be converted from the working configuration to the transport configuration by moving the four base elements relative to each other.

[0012] The relative movement of the four base elements during the transition from the working configuration to the transport configuration serves, in particular, to reduce the spatial dimensions of the assembly aid. Compared to the working configuration, the assembly aid in the transport configuration has smaller spatial dimensions in at least one spatial direction and preferably in two spatial directions. This means that the assembly aid is spatially more compact in the transport configuration than in the working configuration and therefore requires less space when loaded into a vehicle or transported through a building to a work site.

[0013] When the assembly aid is in its working configuration, it must have sufficient spatial dimensions to precisely align the lining boards and the lintel section of the frame. The working configuration is therefore determined by the arrangement of the longitudinal and transverse rails into which the lining boards and the transverse section of the door frame are placed for assembly.

[0014] To achieve this, the base elements are initially positioned so that the longitudinal rails of all base elements run in one plane and parallel to a longitudinal direction. In other words, in the working configuration, all longitudinal rails are aligned parallel to each other and run in or on the same working plane. The working plane can be defined, for example, by the surfaces of the base elements on which the longitudinal rails are arranged.

[0015] Furthermore, the longitudinal rails of a first pair of base elements are aligned with one another. This means that a longitudinal rail on a first base element of the first pair of base elements forms the extension of a longitudinal rail on a second base element of the pair of base elements. The longitudinal rails generally do not directly adjoin one another, since the base elements of the first pair of base elements are regularly spaced apart from one another in the longitudinal direction when the assembly aid is in the working configuration. At least due to the spacing of the base elements, the longitudinal rails are also spaced apart from one another in the longitudinal direction.

[0016] The aligned arrangement of two longitudinal rails on the first pair of base elements allows the same lining board to be inserted into two aligned longitudinal rails. This holds the lining board in the longitudinal direction over an extended distance and also ensures precise longitudinal alignment.

[0017] Accordingly, it is provided that the longitudinal rails of a second pair of base elements are also aligned with one another. The longitudinal rails on the two remaining base elements are therefore also arranged in such a way that a longitudinal rail on a first base element of the second pair of base elements forms an extension of a longitudinal rail on a second base element of the second pair of base elements, whereby here too the base elements of the second pair of base elements and thus also the longitudinal rails arranged thereon are spaced apart from one another in the longitudinal direction. The second lining board of the door frame to be installed can thus be arranged in the aligned longitudinal rails of the second pair of base elements. By arranging the lining board in the longitudinal rails of the second pair of base elements, it is aligned exactly parallel to the longitudinal direction.

[0018] In an exemplary preferred embodiment, in the working configuration, the distance between the two base elements of the first pair of base elements in the longitudinal direction is identical to the distance of the base elements of the second pair of base elements in the longitudinal direction.

[0019] Furthermore, the base elements and thus also the longitudinal rails arranged thereon are positioned relative to one another in the working configuration of the assembly aid such that the distance between two aligned longitudinal rails on the first pair of base elements and two aligned longitudinal rails on the second pair of base elements corresponds to a standardized distance. In other words, for each longitudinal rail that is part of a base element of the first pair of base elements, there is a longitudinal rail on a base element of the second pair of base elements that extends parallel to it and is arranged at a standardized distance. The distance is determined perpendicular to the longitudinal direction, i.e., in the transverse direction.

[0020] In this context, a standardized distance is understood to be a distance that is specified in a standard commonly used in house construction, such as DIN 18100, for the distance between casing boards and door frames. For example, a standardized distance can be the clear opening dimension defined in DIN 18100 or the frame rebate dimension. The distances can also be specified in a different standard depending on the region or country in which the frames are to be installed. The specific dimension specified in the standard that the standardized distance corresponds to also depends on how the distance is measured. For example, if the distance is measured from the inside edge to the inside edge of the longitudinal rails, the standardized distance will be different than if it is measured from the center of the longitudinal rails or their outer edges. The dimensions specified in the respective standards can be directly translated into suitable distances for the longitudinal rails.

[0021] To install a door frame, the two lining boards of the frame are inserted into the longitudinal rails, which are spaced at the correct distance for the door frame. The longitudinal rails ensure that the lining boards run exactly parallel to each other and are arranged at a standardized spacing. Since several pairs of longitudinal rails with different standardized spacings are provided on the base elements, door frames for different door widths can be advantageously assembled on the same assembly aid.

[0022] Finally, the assembly aid also has at least two cross rails arranged on two base elements. One cross rail is attached to a base element of the first pair of base elements, while the other cross rail is attached to a base element of the second pair of base elements. When the assembly aid is in its working configuration, the two cross rails are aligned flush with each other and parallel to a transverse direction. Thus, one cross rail can also be considered an extension of the other cross rail. The lintel section of a door frame can then be inserted into the cross rails; thanks to the assembly aid, this section is positioned at right angles to the two lining boards.In addition, since the two lining boards are arranged at the intended distance from each other and are held by the longitudinal and transverse rails, the two lining boards can be advantageously connected directly to the lintel section.

[0023] The assembly aid according to the invention thus advantageously enables the lining boards and the lintel section of a door frame to be precisely arranged relative to one another, both in terms of spacing and alignment. The door frame sections are also held in place by the longitudinal rails and the cross rail, allowing the carpenter to concentrate on connecting the lining boards and the lintel section.

[0024] In a preferred embodiment, four longitudinal rails running parallel to one another for receiving lining boards of door frames are arranged on each of the base elements in such a way that, in the working configuration, four different standardized distances are formed between the longitudinal rails of the first pair of base elements and the longitudinal rails of the second pair of base elements.

[0025] In other words, the preferred embodiment provides that each of the four base elements has four longitudinal rails. In total, the assembly aid thus has 16 longitudinal rails, two of which are arranged in pairs such that, in the working configuration, they each accommodate a lining board. This achieves a total of four different standardized distances between the longitudinal rails of the first pair of base elements and the longitudinal rails of the second pair of base elements. These four standardized distances can, for example, correspond to the four most common widths of door openings used in a particular region or country.

[0026] In an exemplary preferred embodiment, the distances between the inner edges of the longitudinal rails of the first pair of base elements and the inner edges of the longitudinal rails of the second pair of base elements are 570 mm, 695 mm, 820 mm, and 945 mm from the inside out. In other words, the distance between the innermost longitudinal rails that are arranged closest to one another perpendicular to the longitudinal direction is 570 mm, with the distance being measured from inner edge to inner edge. The longitudinal rails that are each closest to the innermost longitudinal rails are arranged at a distance of 695 mm from inner edge to inner edge. The distance between the outwardly adjacent longitudinal rails to these longitudinal rails is accordingly 820 mm, and the distance between the outermost longitudinal rails is 945 mm perpendicular to the longitudinal direction.

[0027] It is further preferred if the assembly aid is configured such that the assembly aid can be converted from the transport configuration to the working configuration and from the working configuration to the transport configuration exclusively by translational movements of the base elements. In other words, the preferred embodiment provides that the base elements can be converted from the transport configuration to the working configuration exclusively by movements performed in one plane. The reverse conversion of the assembly aid from the working configuration to the transport configuration also occurs in the preferred embodiment exclusively by relative movements of the base elements in one plane.

[0028] In a further preferred embodiment, the base elements are connected to one another via guide rails in such a way that the base elements can be displaced relative to one another parallel to the working plane in order to transfer the assembly aid from the transport configuration to the working configuration and from the working configuration to the transport configuration.

[0029] In other words, the preferred embodiment provides for the base elements to be connected to one another via guide rails. The guide rails can, for example, be formed by telescopic rails with a rectangular cross-section.

[0030] For example, a guide tube with a rectangular cross-section, i.e. a hollow profile with a rectangular cross-section, can be arranged on each of the four base elements and runs parallel to the longitudinal direction. The guide tubes on the first pair of base elements are aligned so that they are flush with one another. The guide tubes on the second pair of base elements are also aligned so that they are flush with one another. Rectangular connecting tubes, i.e. profiles with a correct cross-section, are arranged in the guide tubes and connect the guide tubes of the base elements to one another. The combination of guide and connecting tubes forms the guide rails, along which the base elements can be moved longitudinally relative to one another. The guide rails thus determine and limit the relative movement of the base elements in the longitudinal direction.

[0031] A corresponding combination of rectangular guide and connecting tubes extending in the transverse direction and attached to the base elements can, for example, form the guide rails that specify and limit the relative movement of the base elements in the transverse direction.

[0032] The guide rails preferably limit the position of the base elements relative to one another in such a way that when the base elements are at a maximum distance from one another, the assembly aid is in the working configuration and when the base elements are at a minimum distance from one another, the assembly aid is in the transport configuration. The guide rails specify the positions of the base elements relative to one another and limit them in such a way that when the base elements are at a minimum distance from one another, the assembly aid is in the transport position, i.e. has the most compact spatial dimensions possible. A minimum distance between the base elements can also mean that the base elements lie directly against one another. If, on the other hand, the base elements are pulled apart as far as possible, the assembly aid in the preferred embodiment is in the working configuration in which the longitudinal rails are arranged at the specified standardized distances from one another.Since the base elements only have to be moved back and forth between the extreme positions in order to transfer the assembly aid between the working configuration and the transport configuration, this simplifies the assembly of the assembly aid and also ensures that the assembly aid enables precise assembly of the door frames.

[0033] In a further preferred embodiment, each base element has a base plate on which the longitudinal rails and, if present, the transverse rails are arranged. The base plates can be made of, for example, plywood, plastics, composite materials, or metals such as aluminum. The base plates can also be used, among other things, to position the assembly aid in the working position on commercially available workbenches. This allows the door frame to be assembled at a back-friendly working height.

[0034] Furthermore, it is preferred if the longitudinal rails and, if present, the transverse rails are arranged on a first surface of the base plate, while the guide rails are arranged on a second surface of the base plate, which is opposite the first surface of the base plate. In the preferred embodiment, it is thus provided that the longitudinal and transverse rails are each fastened to one surface of the base plate, while the guide rails are fastened to the opposite surface of the base plate. This advantageously keeps the work surface on which the longitudinal and transverse rails are arranged free of the guide rails, so that they do not hinder the work during assembly of the door frame.

[0035] In a further preferred embodiment, the base plates of the base elements which comprise a cross rail have a recess in the region in which an extension direction of the cross rail of the base element intersects the extension directions of the two or more longitudinal rails of the base element. In other words, the base plates on which a cross rail is arranged have a recess in the region in which the lining boards are connected to the lintel section. This provides access to the door frame in the area of ​​the joint between the lining board and the lintel section from both above and below. This means that in particular the area of ​​the joint formed by the narrow sides of the door frame resting on the assembly aid is not hidden from the field of vision of the person assembling the frame - in this case this. Rather, the person can also look at the frame from below.This is especially true if the assembly aid is jacked up, i.e. placed on work trestles.

[0036] Preferably, each of the four base elements has a cross rail. The cross rail of a base element of the first pair of base elements is aligned with the cross rail of a base element of the second pair of base elements. By providing a cross rail on each of the four base elements, the mounting aid can advantageously be used in different directions. The lintel section can thus be placed on any of the four base elements, further increasing the flexibility of use of the mounting aid.

[0037] Finally, it is preferable if the four basic elements of the assembly aid are constructed identically. This reduces the manufacturing effort required to build the assembly aid, as only one version of the basic elements needs to be built.

[0038] The present invention will be described in more detail below with reference to the drawing showing an embodiment of an assembly aid. Figure 1 shows a plan view of a first embodiment of an assembly aid in a transport configuration, Figure 2 shows a perspective view of the embodiment of Figure 1 in the transport configuration, Figure 3 shows a further perspective view of the embodiment from Figure 1 in the transport configuration, Figure 4 a top view of the embodiment from Figure 1 in a working configuration, Figure 5 a perspective view of the embodiment of Figure 1 also in the working configuration, Figure 6 a further perspective view of the embodiment from Figure 1 also in the working configuration, Figure 7 a plan view of a single base element of the embodiment from Figure 1, Figure 8 a perspective view of the base element from Figure 7 and Figure 9 another perspective view of the base element from Figure 7 .

[0039] In the Figures 1-9 An embodiment of an assembly aid 1 for a door frame is shown. Specifically, the Figures 1-3 different views of the assembly aid 1 in a transport configuration, the Figures 4-6 show different views of the assembly aid 1 in a working configuration and the Figures 7-9 finally show different views of a base element 3b, 3c of the assembly aid 1.

[0040] The assembly aid 1 comprises a total of four base elements 3a, 3b, 3c, 3d. Each base element 3a, 3b, 3c, 3d is based on a base plate 5, on which four longitudinal rails 7a, 7b, 7c, 7d and one cross rail 9 are arranged. All longitudinal rails 7a, 7b, 7c, 7d run parallel to each other and parallel to a longitudinal direction 11 in a working plane. The cross rails 9 also extend in the working plane, but perpendicular to the longitudinal direction 11 and thus parallel to a transverse direction 13. The longitudinal direction 11 and the transverse direction 13 are merely in the Figures 1 , 4 and 7 which show a top view of the assembly aid 1 and the base element 3b, 3c.

[0041] Both the longitudinal rails 7a, 7b, 7c, 7d and the transverse rails 9 are formed by U-shaped profiles in the embodiment shown in the figures and are provided for receiving lining boards 15a, 15b or a lintel section 17, a door frame 19. An exemplary door frame 19 is shown in the Figures 4-6shown. The width of the U-profiles perpendicular to their respective direction of extension, ie, in the case of the longitudinal rails 7a, 7b, 7c, 7d perpendicular to the longitudinal direction 11 and in the case of the transverse rail 9 perpendicular to the transverse direction 13, was selected such that it corresponds to the usual thickness of the narrow side of the lining boards 15a, 15b or the lintel section 17 or can accommodate lining boards 15a, 15b and lintel section 17 in usual dimensions. The U-profiles can, for example, be made of a metal such as aluminum. Padding made of an elastic material can be arranged within the U-profile to prevent damage to the door frame 19 by the metallic U-profiles.

[0042] In the Figures 1-3the assembly aid 1 is shown in a transport configuration in which the four base elements 3a, 3b, 3c, 3d lie directly against one another. The transport configuration is intended for transporting the assembly aid 1, for example, in a vehicle or for carrying it to a work site on a construction site or in a building. In order for the four base elements 3a, 3b, 3c, 3d to remain in contact and the assembly aid 1 thus in the transport configuration, locking means can be provided with which the base elements 3a, 3b, 3c, 3d are connected to one another and a relative movement of the base elements 3a, 3b, 3c, 3d to one another is prevented. The locking means are not shown in the figures. Commercially available tension locks or storm hooks, for example, can be used as locking means.

[0043] The Figures 4-6show the same embodiment. However, the assembly aid 1 has been converted into the working configuration by moving the four base elements 3a, 3b, 3c, 3d parallel to or in the working plane away from each other. Already from the comparison of the Figures 4-6 and 1-3 It is immediately apparent that the spatial dimensions of the assembly aid 1 in the transport configuration are smaller in both the longitudinal direction 11 and the transverse direction 13 than in the working configuration. Thus, the assembly aid 1 is more compact in two spatial directions (the longitudinal direction 11 and the transverse direction 13) in the transport configuration than in the working configuration and can therefore be transported more easily.

[0044] In the working configuration, the four base elements 3a, 3b, 3c, 3d no longer lie directly adjacent to one another, but are spaced apart from one another in both the longitudinal direction 11 and the transverse direction 13. The distance 18a between the base elements 3a, 3c in the longitudinal direction 11 is identical to the distance 18b between the base elements 3b, 3d in the longitudinal direction 11. In the transverse direction, the distance 20a between the base elements 3a, 3b is identical to the distance 20b between the base elements 3c, 3d.

[0045] However, the base elements 3a, 3b, 3c, 3d are positioned relative to one another such that each longitudinal rail 7a, 7b, 7c, 7d is aligned with a longitudinal rail 7a, 7b, 7c, 7d of another base element 3a, 3b, 3c, 3d. For example, the longitudinal rail 7a of the first base element 3a forms the extension of the longitudinal rail 7a of the third base element 7c. Correspondingly, the longitudinal rail 7c of the second base element 3b forms the extension of the longitudinal rail 7c of the fourth base element 3d.

[0046] The base elements 3a, 3b, 3c, 3d can thus be combined to form a first pair 21a of base elements 3a, 3c and a second pair 21b of base elements 3b, 3d, wherein the longitudinal rails 7a, 7b, 7c, 7d of the pairs 21a, 21b are aligned with each other and serve to receive a lining board 15a, 15b. Figures 4-6For example, it is shown that a first lining board 15a of the door frame 19 was inserted into the longitudinal rails 7a of the first pair 21a, while a second lining board 15b of the door frame 19 was inserted into the longitudinal rails 7a of the second pair 21b. The longitudinal rails 7a, 7b, 7c, 7d support the lining boards 15a, 15b and align them exactly parallel to the longitudinal direction 11.

[0047] Furthermore, the assembly aid 1 is configured such that the longitudinal rails 7a, 7b, 7c, 7d are positioned in pairs at a standardized distance when the assembly aid is in the working configuration. For example, the longitudinal rails 7d of the first pair 21a of base elements 3a, 3c are arranged at a first standardized distance of 570 mm from the longitudinal rails 7d of the second pair 21b of base elements 3b, 3d, wherein the distance and the subsequent distances were each measured between the inner edges of the longitudinal rails 7a, 7b, 7c, 7d. Furthermore, the distance is measured perpendicular to the direction of extension of the longitudinal rails 7a, 7b, 7c, 7d and thus perpendicular to the longitudinal direction 11.Accordingly, the longitudinal rails 7c of the first pair 21a of base elements 3a, 3c are arranged at a second standardized distance of 695 mm from the longitudinal rails 7c of the second pair 21b of base elements 3b, 3d, the longitudinal rails 7b of the first pair 21a of base elements 3a, 3c are arranged at a third standardized distance of 820 mm from the longitudinal rails 7b of the second pair 21b of base elements 3b, 3d, and the longitudinal rails 7a of the first pair 21a of base elements 3a, 3c are arranged at a fourth standardized distance of 945 mm from the longitudinal rails 7a of the second pair 21b of base elements 3b, 3d. The standardized distances are specified by DIN 18100, which specifies the dimensions of door openings in Germany.

[0048] The lining boards 15a, 15b are thus not only aligned parallel to the longitudinal direction 11 by means of the longitudinal rails 7a, 7b, 7c, 7d, but are also advantageously placed at one of four standardized distances from one another in order to mount the door frame 19 to suit the respective door opening.

[0049] Corresponding to the longitudinal rails 7a, 7b, 7c, 7d, the cross rails 9 of each pair of base elements 3a, 3b, 3c, 3d are also aligned in the working configuration, so that a lintel section 17 can be inserted into each pair of cross rails 9. The cross rails 9 thus align the lintel section perpendicular to the lining boards 15a, 15b.

[0050] This is also advantageous for the four different standardized widths, which can be obtained with the assembly aid 1 from the Figures 1-9can be mounted, only one position for a lintel section 17 is necessary, since the longitudinal rails 7a, 7b, 7c, 7d do not extend to the connecting areas 23 in which the lintel section 17 is connected to the lining boards 15a, 15b. In the connecting areas 23, a recess 25 has also been introduced into the base plates 5 of the base elements 3a, 3b, 3c, 3d. The recesses 25 advantageously allow the connection between the lining boards 15a, 15b and the lintel sections 17 to be viewed from different directions and in particular from below.

[0051] This is especially true when the assembly aid 1 is stored on trestles. For example, the assembly aid 1 can be placed on the trestles in the working configuration with the base plates 5 of the base elements 3a, 3b, 3c, 3d, which additionally allows the person assembling the frame to perform the assembly at a back-friendly working height.

[0052] In the embodiment in the Figures 1 to 9 It is also provided that each base element 3a, 3b, 3c, 3d has a cross rail 9. This allows the assembly aid 1 to be used in two different orientations.

[0053] In particular, the Figures 3 , 6 and 9 also show an arrangement of guide rails 27a, 27b, which limit the possible movement of the base elements 3a, 3b, 3c, 3d relative to each other to displacements in the working plane and also the maximum distance between the base elements 3a, 3b, 3c, 3d. The guide rails 27a, 27b are telescopic rails made of tubes with a rectangular cross-section and are arranged on a surface 31 of the base plates 5 of the base elements, which faces away from a surface 33 on which the longitudinal and transverse rails 7a, 7b, 7c, 7d, 9 are arranged.

[0054] Two guide rails 27a, 27b are attached to each base element 3a, 3b, 3c, 3d, with one guide rail 27a extending parallel to the longitudinal direction 11 and one guide rail 27b extending parallel to the transverse direction 13. The guide rails 27a, 27b are connected to each other by rectangular connecting tubes 29. The guide rails 27a, 27b limit the maximum distance at which the base elements 3a, 3b, 3c, 3d can be positioned from each other, thus defining the working configuration. Furthermore, the guide rails 27a, 27b ensure that the longitudinal and transverse rails 7a, 7b, 7c, 7d, 9 are aligned with each other and positioned at a standardized distance from each other. List of reference symbols

[0055] 1Assembly aid 3a, 3b, 3c, 3dBase element 5Base plate 7a, 7b, 7c, 7dLongitudinal rail 9Cross rail 11Longitudinal direction 13Cross direction 15a, 15bFilling board 17Lintelligible section 18a, 18bSpacing of the base elements in the longitudinal direction 19Door frame 20a, 20bSpacing of the base elements in the cross direction 21a, 21bPair of base elements 23Connecting area 25Recess 27a, 27bGuide rails 29Connecting tube 31Surface 33Surface

Claims

1. An assembly aid (1) for assembling a door frame (19), wherein the assembly aid (1) comprises four base elements (3a, 3b, 3c, 3d), wherein each base element (3a, 3b, 3c, 3d) comprises at least two longitudinal rails (7a, 7b, 7c, 7d) extending parallel to one another for receiving a lining board (15a, 15b) of a door frame (19), wherein at least two of the four base elements (3a, 3b, 3c, 3d) comprise a transverse rail (9) for receiving a lintel section (17) of a door frame (19), wherein the base elements (3a, 3b, 3c, 3d) can be moved relative to one another in order to transfer the assembly aid (1) from a transport configuration into a working configuration and from the working configuration into the transport configuration, wherein the assembly aid (1) has smaller spatial dimensions in at least one spatial direction in the transport configuration than in the working configuration, and wherein in the working configuration the base elements (3a, 3b, 3c, 3d) are positioned sothat the longitudinal rails (7a, 7b, 7c, 7d) of all base elements (3a, 3b, 3c, 3d) run in a working plane and parallel to a longitudinal direction (11), that the longitudinal rails (7a, 7b, 7c, 7d) of a first pair of base elements (3a, 3b, 3c, 3d) are aligned in alignment with one another in order to receive a first lining board (15a, 15b) of a door frame (19), that the longitudinal rails (7a, 7b, 7c, 7d) of a second pair of base elements (3a, 3b, 3c, 3d) are aligned in alignment with one another in order to receive a second lining board (15a, 15b) of a door frame (19), that a distance between each two longitudinal rails (7a, 7b, 7c, 7d) of the first pair of base elements (3a, 3b, 3c, 3d) and two longitudinal rails (7a, 7b, 7c, 7d) of the second pair of base elements (3a, 3b, 3c, 3d) perpendicular to the longitudinal direction (11) corresponds to a standardized distance and that the transverse rail (9) of a base element (3a, 3b, 3c, 3d) of the first pair of base elements (3a, 3b, 3c,3d) is aligned with the cross rail (9) of a base element (3a, 3b, 3c, 3d) of the second pair of base elements (3a, 3b, 3c, 3d).

2. Assembly aid (1) according to claim 1, wherein on each of the base elements (3a, 3b, 3c, 3d) four longitudinal rails (7a, 7b, 7c, 7d) running parallel to one another for receiving lining boards (15a, 15b) of door frames (19) are arranged such that in the working configuration four different standardized distances are formed between the longitudinal rails (7a, 7b, 7c, 7d) of the first pair of base elements (3a, 3b, 3c, 3d) and the longitudinal rails (7a, 7b, 7c, 7d) of the second pair of base elements (3a, 3b, 3c, 3d).

3. Assembly aid (1) according to one of the preceding claims, wherein the assembly aid (1) is configured such that the assembly aid (1) can be transferred from the transport configuration into the working configuration and from the working configuration into the transport configuration exclusively by translational movements of the base elements (3a, 3b, 3c, 3d).

4. Assembly aid (1) according to one of the preceding claims, wherein the base elements (3a, 3b, 3c, 3d) are connected to one another via guide rails in such a way that the base elements (3a, 3b, 3c, 3d) can be displaced relative to one another parallel to the working plane in order to transfer the assembly aid (1) from the transport configuration into the working configuration and from the working configuration into the transport configuration.

5. Assembly aid (1) according to claim 4, wherein the guide rails (27a, 27b) limit a position of the base elements (3a, 3b, 3c, 3d) relative to one another in such a way that at a maximum distance between the base elements (3a, 3b, 3c, 3d) from one another, the assembly aid (1) is in the working configuration and that at a minimum distance between the base elements (3a, 3b, 3c, 3d) from one another, the assembly aid (1) is in the transport configuration.

6. Mounting aid (1) according to one of the preceding claims, wherein each base element (3a, 3b, 3c, 3d) has a base plate (5) on which the longitudinal rails (7a, 7b, 7c, 7d) and, if present, transverse rails (9) are arranged.

7. Mounting aid (1) according to claim 4 or 5 and according to claim 6, wherein the longitudinal rails (7a, 7b, 7c, 7d) and, if present, the transverse rails (9) are arranged on a first surface of the base plate (5), and the guide rails (27a, 27b) are arranged on a second surface of the base plate (5) which is opposite the first surface.

8. Mounting aid (1) according to claim 6 or 7, wherein the base plates of the base elements which have a cross rail (9) have a recess in the region in which an extension direction of the cross rail (9) of the base element (3a, 3b, 3c, 3d) intersects the extension directions of the two or more longitudinal rails (7a, 7b, 7c, 7d) of the base element (3a, 3b, 3c, 3d).

9. Mounting aid (1) according to one of the preceding claims, wherein each of the four base elements (3a, 3b, 3c, 3d) has a cross rail (9), and wherein the cross rail (9) of a base element (3a, 3b, 3c, 3d) of the first pair of base elements (3a, 3b, 3c, 3d) is aligned in each case with the cross rail (9) of a base element (3a, 3b, 3c, 3d) of the second pair of base elements (3a, 3b, 3c, 3d).

10. Assembly aid (1) according to one of the preceding claims, wherein the four base elements (3a, 3b, 3c, 3d) are constructed identically.

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