Betonsteinform

Abstract

Concrete block mold for the production of concrete form blocks with a mold cavity (1), a core holder strip (3) spanning horizontally across the mold cavity (1), and a mold core (5) arranged within the mold cavity (1) and attached to the core holder strip (3), comprising cover elements (7) and a core shell (9), wherein the cover elements (7) are arranged on both sides of the core holder strip (3) and are attached to the core holder strip (3) by means of at least one detachable connecting element (21), wherein the connecting element (21) engages transversely to a longitudinal direction of the core holder strip (3) into at least one of the cover elements (7) and into the core holder strip (3), wherein the core shell (9) is detachably connected to the cover elements (7), and the connection between the cover elements (7) and the core shell (9) can be established when the cover elements (7) are attached to the core holder strip (3).

Description

[0001] The invention relates to a concrete block mold for the machine production of concrete blocks, in which a mold core is arranged in a mold cavity.

[0002] For the machine production of precast concrete blocks, steel molds are typically used, each with at least one cavity bounded by side walls, the inner contour of which determines the outer contour of the blocks to be produced. Such molds often comprise several laterally adjacent cavities. The cavities are open at the top and bottom. By placing the mold on a flat, horizontal surface, the lower openings can be closed, and the cavities can be filled with flowable concrete mix through the upper openings. Pressure from a pressure plate assembly inserted through the upper openings, and advantageously from vibration of the surface, solidifies the concrete mix into dimensionally stable precast concrete blocks, which are then demolded through the lower openings of the cavities.

[0003] In the case of large-volume concrete blocks, such as hollow blocks or blocks used, for example, as grass pavers, recesses are created in the block volume to reduce weight and material usage and / or for thermal insulation. This is achieved by placing one or more mold cores in the mold cavities. The mold cores are held in positions spaced from the side walls of the mold cavities by core holder strips that span the cavities horizontally. The mold cores are typically made of hollow sheet metal.

[0004] WO2012025392A1 shows a concrete block mold with mold cores that are detachably attached to a core holder strip by detachably attaching a base body of the mold cores to the core holder strip.

[0005] The task is to specify a concrete block mold with an alternative fastening for a mold core.

[0006] The problem is solved by a concrete block mold for the production of concrete blocks with the features of claim 1.

[0007] The concrete block mold comprises a mold cavity, a core support strip spanning the mold cavity horizontally, and a mold core located within the mold cavity and attached to the core support strip. The core core includes cover elements and a core shell. The cover elements are arranged on both sides of the core support strip and are attached to the core support strip by means of at least one detachable connecting element. This connecting element engages transversely to a longitudinal direction of the core support strip, interlocking with at least one of the cover elements and the core support strip itself. The core shell is detachably connected to the cover elements, and the connection between the cover elements and the core shell can be established when the cover elements are attached to the core support strip.

[0008] The cover elements are connected to both the core retaining strip and the core shell. However, the connection between the core retaining strip and the core shell is only indirect, namely through the cover elements positioned between them.

[0009] The mold core, with its cover elements and core shell, is assembled only when attached to the core holder strip. First, the cover elements are attached to the core holder strip using the connecting element(s). Only then is the core shell attached to the cover elements already attached to the core holder strip. The connection is such that it is not obstructed by the connecting elements and is advantageously made using further connecting elements. However, in an advantageous embodiment, the first connecting elements are no longer accessible after the cover elements and core shell have been joined. Therefore, the disassembly of the mold core from the core holder strip is carried out in reverse order: The core shell is loosened and removed, and then the cover elements are removed from the core holder strip.Unlike mold cores that are permanently attached to the core holder strip, no welding is required for mounting the mold core.

[0010] The concrete block mold described above is a hollow block mold in which the mold core is securely attached to the core holder strip in a simple manner. The mold has few components, resulting in a robust device. The mold core is removable. It can be taken out for repairs or replaced to adapt the mold design.

[0011] The concrete block mold can have multiple cavities with multiple cores, and multiple cores can also be arranged within a single cavity. The cavities are defined by the side walls of the concrete block mold. The cavities are open at the top and bottom. By placing the mold on a flat, horizontal surface, the lower openings can be closed, and the cavities can be filled with flowable concrete mix through the upper openings. Pressure from a pressure plate assembly inserted through the upper openings, and advantageously from vibration of the surface, solidifies the concrete mix into dimensionally stable concrete blocks, which are then demolded through the lower openings of the cavities. The cores are held in positions spaced apart from the side walls of the cavities by core holder strips that span the cavities horizontally.The mold cores, which protrude into the mold cavities, create recesses in the concrete blocks, as the concrete mix must flow around them. The mold cores can have a cylindrical or truncated pyramidal shape, with the slightly tapered shape of the truncated pyramids facilitating the removal of the mold cores from the recesses in the concrete blocks.

[0012] The multi-part mold cores have a core shell that projects into the mold cavity and essentially defines the shape of the recess in the concrete block to be produced. In one version, the core shell has a cavity that can be open or closed on the underside. Cover elements are provided on the side of the core shell facing away from the mold cavities; these cover elements connect the core shell to the core retainer strip.

[0013] Advantageously, two cover elements are provided, arranged in a horizontal plane on opposite sides of the core holder strip. Each connecting element joins at least one of the cover elements to the core holder strip. If the connecting element is designed to join only one of the cover elements to the core holder strip, at least two connecting elements are required to attach both cover elements to the core holder strip. Alternatively, the connecting element extends through the core holder strip and both cover elements. Even with such a connection, several, preferably two, connecting elements can be provided.

[0014] An alternative concrete block mold for the production of precast concrete blocks is provided with a mold cavity, a core retainer bar spanning the mold cavity horizontally, and a mold core located within the mold cavity and attached to the core retainer bar. The core core comprises cover elements and a core shell. Detachable fasteners are arranged on both sides of the core retainer bar and engage transversely to a longitudinal direction of the core retainer bar in or through the core retainer bar. The cover elements are arranged on both sides of the core retainer bar, with the core shell being detachably connected to the fasteners, such that the cover elements are positioned between the fasteners and the core shell, and the connection between the core shell and the fasteners can be established when fasteners engage in or through the core retainer bar.

[0015] In contrast to the previous design, here the core shell is connected to the fasteners, which engage through the core retaining strip. The cover elements are held in place between the fasteners and the core shell, preferably by fasteners that extend between the fasteners and the core shell through the cover elements. These can be screws. The cover elements can thus be clamped between the fasteners and the cover elements.

[0016] The connecting means comprise several components, at least one of which engages through the core holder strip and is preferably connected to another component laterally to the core holder strip. Alternatively, the connecting means can also engage the core holder strip only from one side, so that they do not protrude on the other side.

[0017] Nevertheless, both versions of the concrete block form share the same basic concept. The cores are not only detachably attached to the core holder strip, but the actual assembly only takes place after the connection to the core holder strip has been established for some of the components – in one version by the cover elements and in the other by the connecting elements. The components subsequently mounted advantageously lock the components already attached to the core holder strip in place, preventing them from detaching.

[0018] In one embodiment, the cover elements each have a top surface, and the connecting element engages through at least one of the cover elements below its top surface and the core retaining strip. If the connecting element engages both cover elements, the engagement occurs below the top surfaces of both cover elements. This means the connecting elements are not accessible from the top surface; they run inside the cover elements.

[0019] The core sleeve is positioned on the undersides of the cover elements, facing away from their tops. During assembly, the core sleeve is slid onto the cover elements, which are already attached to the core retaining strip, from below. In one embodiment, the cover elements are at least partially recessed into the core sleeve, so that an upper sleeve section of the core sleeve forms an outer rim around the cover elements, preventing horizontal movement of the cover elements away from the core retaining strip. The secure connection, preferably by screwing, between the core sleeve, which with its upper sleeve section forms a form-fitting frame around the cover elements, and the cover elements ensures that the components can no longer detach in any direction.

[0020] When the core shell is attached to the fasteners, in this embodiment the fasteners advantageously engage the cover elements from above, so that they are at least partially recessed within them. The cover elements, which laterally encompass the fasteners, lock the fasteners connected to the core holder strip in place, preventing them from coming loose. The fasteners can comprise two cuboid blocks to which the core shell is attached, and a bolt extending through the core holder strip, which engages the blocks on both sides of the core holder strip at its end face. The blocks advantageously have internal threads.

[0021] An internal stop within the core shell, against which the cover elements rest, determines how far the cover elements are lowered and prevents the core shell from sliding forward during component assembly. Such a stop can be formed by inwardly projecting supports or a ceiling within the core shell. The ceiling defines the cavity inside the core shell. The cover elements rest on this ceiling. The top surfaces of the cover elements can be flush or nearly flush with the upper edge of the core shell. Alternatively, they can project beyond the upper edge or be recessed below it.

[0022] When the core shell is attached to the connecting elements, the cover elements advantageously rest on the upper side of the core shell in this design. A rib at the edge of the core shell, engaging with the cover elements, acts as a lateral stop, defining the alignment of the components relative to each other.

[0023] The connecting elements or fasteners advantageously run through a neutral fiber of the core holder strip, thus minimizing mechanical stress and the risk of breakage of the core holder strip, which is weakened by the holes through which the connecting elements engage, under bending loads occurring during operation. A neutral fiber is defined as the fiber or layer of a strip cross-section whose length does not change when twisted or bent. The mechanical stress does not cause any tensile or compressive stress there.

[0024] The connecting elements that join the cover elements to the core retainer strip are called first connecting elements. The connection between the cover elements and the core shell is made by further, second connecting elements. The first connecting elements can be bolts or screws extending into cavities beneath the top surfaces. Advantageously, the cover element is essentially designed as a solid plate with horizontal cavities extending transversely to the longitudinal direction of the core retainer strip for the first connecting elements. Their shape, particularly their cross-sectional shape, can correspond to the shape of the connecting element, and the cavity can be designed as a through hole, particularly for screws, or a blind hole, particularly for bolts.

[0025] The second set of connecting elements runs essentially vertically and perpendicular to the longitudinal direction through the cover panels and core shell to connect the cover panels to the core shell. These second set of connecting elements are positioned so that they do not collide with the horizontally running first set of connecting elements. This allows the connection between the cover panels and the core shell to be established even when the cover panels are already attached to the core retaining strip. Advantageously, these second set of connecting elements are screws. In one embodiment, one screw is provided for each cover panel to connect it to the core shell.

[0026] In one design, the screws are screwed into the cover elements from the underside and extend through the core shell into the cover elements, which are already connected to the core holder strip. The screw heads rest against the top of the core shell within its cavity. The externally threaded shanks of the screws engage with internal threads provided in the cover elements. In this design, the core shell is open on the underside, so that when the mold core is inserted into the mold cavity, neither the first nor the second connecting elements are accessible.

[0027] In an alternative embodiment, the screws are screwed into the top surfaces of the cover elements as a secondary connecting element, and extend through the cover elements into the core shell. The core shell has a top and bottom surface with an internal thread, and the cover elements are arranged on this surface. This internal thread can be a nut welded to the underside of the sheet metal cover. Alternatively, the nut can be loosely attached to the cover, and the loose nut is then screwed onto the bolt to form a bolt-nut connection.

[0028] With two cover elements, their outer contours beyond the core retainer strip follow the contour of the core shell. This is the case when the cover elements are recessed into the core shell or when they rest on the core shell so that their side walls are flush with each other. Instead of two separate cover elements, the two cover elements can be formed as a single component that has a slot for the core retainer strip.

[0029] Advantageously, the cover elements are identical in design and arranged symmetrically, which simplifies assembly. The contours of the cover elements are advantageously mirror-symmetrical. In one embodiment, the core shell has a rectangular inner contour, and the cover elements have triangular or rectangular outer contours. In the first case, the core retaining strip runs diagonally through an upper side of the mold core. In the second case, it runs centrally through the upper side of the mold core.

[0030] Some exemplary embodiments are explained in more detail below with reference to the drawing. The drawing shows: Fig. 1. A three-dimensional view of an area of ​​an embodiment of a concrete block mold for the production of concrete blocks, Fig. 2 a top view of an embodiment of a mold core, Fig. 3 a side view of the mold core, Fig. 4 a three-dimensional view of the mold core, Fig. 5 a three-dimensional view of another embodiment of a mold core, Fig. 6 a top view of the mold core, Fig. 7 a side view of the mold core, Fig. 8 a three-dimensional view of yet another embodiment of the mold core, Fig. 9 a three-dimensional representation of another embodiment of a mold core, Fig. 10 an exploded view of this mold core, and Fig. 11 another exploded view of this mold core.

[0031] In the figures, identical or functionally equivalent components are provided with the same reference symbols.

[0032] Fig. Figure 1 shows a three-dimensional view of a section of an embodiment of a concrete block mold for the production of concrete blocks. The concrete block mold comprises several mold cavities 1, only one of which is shown in its entirety, and a core holder strip 3 that spans a series of mold cavities 1 horizontally and holds mold cores 5. The mold cores engage in the mold cavities 1 of the row. Only a section of the core holder strip 3 with a mold core 5 is shown, although for clarity it is spatially separated from the mold cavity 1.

[0033] A coordinate system is shown to describe the component arrangement. "Top" and "bottom" are used as relative terms to refer to positions along the z-axis and opposite the z-axis, respectively. In a working position of the concrete block mold, the z-axis is aligned against the direction of the weight force.

[0034] The mold cavities 1 are horizontally aligned, i.e., parallel to the xy-plane. One longitudinal direction of the core holder strip 3 runs in the direction of the y-axis. The mold core 5 projects vertically in the opposite direction to the z-axis.

[0035] The mold core 5 is detachably attached to the core holder strip 3. The connection between the mold core 5 and the core holder strip 3 is made by means of first connecting elements, which are located in the Fig. 1 are not visible. The mold core 5 has two cover elements 7 and a core shell 9. The core shell 9 forms a basic body of the mold core 5, which projects into the mold cavity 1.

[0036] The core shell 9 is hollow inside and preferably comprises two hemispherical shell halves 11. They abut each other at a joint 13 and are connected to each other, in particular by welding. The joint 13 extends essentially in the direction of the z-axis.

[0037] The two shell halves 11 can each be produced from a single, flat sheet metal blank by bending individual sheet sections relative to each other or by deep drawing a sheet. The core holder strip 3 runs through an upper shell section 15 of the core shell 9. A lower shell section 17 of the core shell 9 essentially defines the recess in the concrete form block to be produced and, in the example shown, is typically designed to taper slightly downwards over most of its vertical extent and to be pointed at the end. Its outer surface forms an essentially cylindrical surface with a rectangular cross-section and rounded edges. During the hardening of the concrete mix filled in the mold cavity 1 up to the top of the mold core 5, pressure plates move downwards along an upper shell section 15.

[0038] The hollow sheet metal body formed by the core shell 9 is closed off at the top by two cover elements 7, which are attached to the core retaining strip 3 and to the core shell 9 in a manner to be described later. The plate-shaped cover elements 7 extend flush or almost flush with an upper edge 19 of the core shell 9, with a narrow gap that may also be sealed by additional sealant. The cover elements 7 can also be made of metal. Cover elements 9 made of plastic are an alternative. The cover elements 7 are each formed in one piece.

[0039] A vertically extending screw, acting as a second connecting element 23, passes through each cover element 7 and connects the cover element 7 to the core shell 9. The screws are countersunk cylinder head screws and are essentially flush with the horizontally extending top surfaces 25 of the cover elements 7.

[0040] The core holder strip 3 is guided through the mold core 5 via lateral recesses in the upper shell area 15. The upper edge of the core holder strip 3 preferably lies in the horizontal plane of the top surfaces 25, but in one embodiment it can project beyond them and be lowered towards them.

[0041] Fig. Figure 2 shows a top view of an embodiment of a mold core 5, as shown in Fig. Figure 1 shows its hidden internal edges, which are shown as dashed lines. The core 5 comprises a core shell 9 and two cover elements 7.

[0042] The mold core 5 is attached to a core holder strip 3 (not shown), which has two threaded holes for attaching a mold core 5. The holes pass through the neutral fiber of the core holder strip 3 and are arranged offset from each other in a horizontal plane in the direction of the y-axis.

[0043] The cover elements 7 are recessed into the core shell 9, such that the horizontal top surfaces 25 of the cover elements 7 are flush or nearly flush with an upper edge 19 of the core shell 9. A gap 27 exists between the cover elements 7, in which the core retaining strip 3 runs. Initial connecting elements 21 extend through the gap 27 and engage through the holes in the core retaining strip 3. Lateral edges of the recessed cover elements 7 beyond the gap 27 are enclosed by an upper shell section 15 of the core shell 9.

[0044] On both sides of the core holder strip 3, the two plate-shaped cover elements 7 are arranged in a horizontal plane. They are attached to the core holder strip 3 by means of detachable first connecting elements 21 oriented transversely to the longitudinal direction of the core holder strip 3. The first connecting elements 21 are designed as screws that run horizontally and antiparallel in the direction of the x-axis.

[0045] The two cover elements 7 are designed in the same manner. They are solid with cavities for the first connecting elements 21. Each cover element 7 has a first and second through-hole 31, 33 extending horizontally in the direction of the x-axis. The first through-hole 31 is widened on the side adjacent to the upper shell area 15 to form a countersunk hole 29 and is provided with an internal thread beyond the countersunk hole 29. The second through-hole 33 of the same cover element 7 does not have an internal thread. The through-holes 31, 33 of the cover elements 7 and the holes in the core holder strip 3 are aligned with each other so that a screw can pass from the countersunk hole 29 through the core holder strip 3 into the other cover element 7.

[0046] In each cover element 7, a screw acts as the first connecting element 21, engaging through the first through hole 31 into the internal thread in the core holder strip 3. The screw head is countersunk in the countersunk hole 29 and covered by the upper sleeve area 15 that surrounds the edge.

[0047] Each cover element 7 is connected to the core holder strip 3 by a screw. The screw, which has an external thread on both its head and shank, engages with the internal thread of both the cover element 7 and the core holder strip 3. The screw is chosen so that its shank tip 59 does not protrude beyond the core holder strip 3, or usually only protrudes slightly. In the latter case, it extends into the second through-hole 33 of the other cover element 7. The screw shank can also extend further into the second through-hole 33, provided that the tip 59 does not protrude from the cover element 7. The absence of an internal thread in the second through-hole 33 prevents an undesirable over-constraint of the connection. Alternatively, the hole into which the shank tip 59 can protrude could not be made completely through.

[0048] In another embodiment, not shown, no second through-hole 33 is provided in the other cover element 7 into which the shaft tip 59 could protrude. In such a case, it is necessary to prevent the shaft tip 59 from protruding from the core holder strip 3, as this would otherwise push the other cover element 7 away from the core holder strip 3 and cause the components to tilt.

[0049] The core shell 9 is fastened to the cover elements 7 by means of screws running vertically through the cover elements 7 as second connecting elements 23, as described in connection with Fig. 3 is described below.

[0050] Fig. Figure 3 shows a side view of the mold core made of Fig. 2, whose hidden edges are shown as dashed lines inside.

[0051] The core shell 9 has an upper shell region 15 and a lower shell region 17. The latter encloses a cavity 37, which is closed at the bottom, has a laterally surrounding shell, and is bounded at the top by a ceiling 39 inside the core shell 9. The ceiling 39 is arranged offset downwards from the upper edge 19. The ceiling 39 comprises a plate 45, in particular a metal plate, with outwardly projecting lugs 41 that engage in recesses 43 of the core shell 9 and thus hold the ceiling 39 in its position.

[0052] Two threaded nuts 47 are attached to the underside of plate 45, for example by welding. Plate 45 has two holes whose position corresponds to the threaded holes, allowing a screw shank to engage through plate 45 and into the threaded hole.

[0053] The core shell 9 is placed on the underside of the cover elements 7, so that the upper shell area 15 extends around the cover elements 7. On the cover 39, the two cover elements 7 are arranged on both sides of the core retaining strip 3. The cover 39 serves as a stop for the cover elements 7 when the core shell 9 is placed. The thickness of the cover elements 7 corresponds to the distance between the cover 39 and the top edge 19 of the core shell 9. Alternatively, the thickness can be chosen so that the cover elements 7 protrude or are recessed.

[0054] Each ceiling element 7 has a third through-hole 35 extending vertically in the direction of the z-axis, forming a cavity that widens at the top 25 into a countersunk hole 49. An optional internal thread may be provided in the third through-hole 35 beyond the countersunk hole 49. The opening of the third through-hole 35 opposite the countersunk hole 49 is aligned with the internal thread in the ceiling 39. A screw, acting as a second connecting element 23, engages through the third through-hole 35 in the internal thread of the nut 47. The screw head is countersunk in the countersunk hole 49.

[0055] During assembly of the mold core 5, its two cover elements 7 are first attached to both sides of the core holder strip 3 using the first connecting elements 21, which are screws. Then the core shell 9 is placed on top and attached to the cover elements 7 using the second connecting elements 23, which are also screws. Disassembly is carried out in reverse order.

[0056] The cover elements 7 are connected to both the core holder strip 3 and the core shell 9. However, the coupling of the core holder strip 3 to the core shell 9 is only indirect, through the cover elements 7 arranged in between.

[0057] Fig. Figure 4 shows a three-dimensional view of the previously described mold core 5 from a top oblique angle. For clarity, one front half of the shell 11 of the core shell 9 and the front cover element 7 have been removed. The core retaining strip 3 is not shown.

[0058] The plate 45 of the ceiling 39 inside the core shell 9 has outwardly projecting lugs 41 that engage in corresponding recesses 43 of the shell halves 11. During assembly, the shell halves 11 are joined and connected so that the lugs 41 of the interposed plate 45 engage in the recesses 43. No further fixing of the ceiling 39 is required. Subsequently, a bent sheet metal plate is attached to the underside of the assembled shell halves 11 as a base 51, for example by welding.

[0059] The connection to the core holder strip 3 is made by the first connecting elements 21, which are designed as screws. In this embodiment, their circular cylindrical countersunk head has an internal hexagon socket for good force transmission. With the core shell 9 in place, the cover elements 7 rest on the plate 45, which acts as a stop. The core shell 9 is fastened by second connecting elements 23, which are also designed as screws. The screws have a circular cylindrical countersunk head with an internal hexagon socket. The screw shank engages through the cover element 7 into an internal thread of a nut 47, which is attached to the underside of the ceiling 39.

[0060] Fig. Figure 5 shows a three-dimensional view of another embodiment of a mold core 5 from a top-down oblique angle. For clarity, a core holder strip 3, to which the mold core 5 can be attached, is not shown.

[0061] The mold core 5 has a cuboid-like basic shape that tapers slightly downwards, so that, strictly speaking, it is a truncated pyramidal basic shape. The essentially vertical corners are rounded. The mold core 5 comprises two cover elements 7 and a core shell 9. The core shell 9 is hollow inside, open at the bottom, and preferably comprises two half-shells with a U-shaped cross-section as shell halves 11. They abut each other at a joint 13, so that the cross-section of the core shell 9 is rectangular, in particular square. The connection can be made by welding. The joint 19 runs essentially vertically along the surface of the core shell and centrally through opposite surface surfaces.

[0062] The two shell halves 11 can each be manufactured from a single piece of flat sheet metal by bending or deep drawing. The core holder strip 3 runs diagonally between two corners through an upper shell area 15.

[0063] The core shell 9 is closed off at the top by two cover elements 7, which are attached to the core shell 9. The plate-shaped cover elements 7 run flush or almost flush with an upper edge 19 of the core shell 9, with a narrow gap which may be sealed by additional sealant. The cover elements 7 can be made of metal or plastic.

[0064] The core retainer strip 3 is guided through the mold core 5 via corner recesses in the upper shell area 15. The upper edge of the core retainer strip 3 preferably lies in the horizontal plane of the top surfaces 25 of the cover elements 7, but can also project beyond them and run downwards towards them.

[0065] Fig. Figure 6 shows a top view of the mold core 5, whose hidden edges are shown as dashed lines. The mold core 5 comprises a core shell 9 and two cover elements 7.

[0066] The mold core 5 is attached to a core holder strip 3 (not shown), which has two holes for attaching a mold core 5. The holes pass through the neutral fiber of the core holder strip 3 and are arranged offset from each other in a horizontal plane along the y-axis. The holes in the core holder strip 3 do not require internal threads.

[0067] The cover elements 7 are recessed into the core shell 9, such that the top surfaces 25 of the cover elements 7 are flush or nearly flush with a top edge 19 of the core shell 9 in a plane parallel to the xy-plane. A gap 27 exists between the cover elements 7, through which the core retaining strip 3 runs. Lateral edges of the cover elements 7 beyond the gap 27 are enclosed by the upper shell area 15 of the core shell 9.

[0068] On both sides of the core holder strip 3, two plate-shaped cover elements 7 with a triangular cross-section are arranged in a horizontal plane. They are attached to the core holder strip 3 by means of detachable first connecting elements 21 oriented transversely to the longitudinal direction of the core holder strip 3. The first connecting elements 21 are pin-shaped bolts that extend horizontally in the direction of the x-axis.

[0069] The two cover elements 7 are identical in design and arranged both mirror-symmetrically and point-symmetrically. The cover elements 7 are solid and contain cavities for the connecting elements 21 and 23. Each cover element 7 has two blind holes 53 extending horizontally in the x-axis direction, the openings of which face the core holder strip 3. The blind holes 53 of the cover elements 7 and the holes of the core holder strip 3 are aligned with each other, allowing a bolt to extend through the core holder strip 3 into the blind holes 53 of the opposing cover elements 7.

[0070] In each deck element 7, two bolts, acting as first connecting elements 21, engage through the core retainer strip 3 into the opposing blind holes 53 of both deck elements 7. The depth of the blind holes 53 is advantageously selected such that the bolts have only minimal play transverse to the longitudinal direction of the core retainer strip 3. Advantageously, the bolts, acting as dowel pins, engage positively and even frictionally in the blind holes 53.

[0071] In one embodiment, the bolts can be tapered at the ends and / or have circumferential grooves to facilitate insertion into the blind holes 53 or to achieve a better fit.

[0072] Nevertheless, additional securing is provided by the pushed-on core shell 9, the upper shell area 15 of which surrounds the cover elements 7 beyond the core holder strip 3 at the edges, thus preventing the cover elements 7 from detaching from the core holder strip 3.

[0073] The core shell 9 is fastened to the cover elements 7 by means of screws running vertically through the cover elements 7 as second connecting elements 23, as described in connection with Fig. 7 is described below.

[0074] Fig. Figure 7 shows a side view of the mold core 5. Fig. 6, whose hidden edges are shown as dashed lines inside.

[0075] The core shell 9 has an upper shell section 15 and a lower shell section 17. The latter encloses a cavity 37 open at the bottom with a laterally surrounding sheet metal shell. The cavity 37 is bounded by a horizontally extending ceiling 39 inside the core shell 9. The ceiling 39 is offset downwards from the upper edge 19 and is arranged on supports 55 projecting into the interior of the core shell 9, to which it is connected. The supports 55 can be designed as lugs or webs. The ceiling 39 is a metal plate with through holes for screws as secondary connecting elements 23.

[0076] The cover elements 7 have vertically extending internal threads 57, the position of which corresponds to the positions of the through holes in the ceiling 39. The internal threads 57 can be formed in blind or through holes for the second connecting elements 23.

[0077] The core shell 9 is placed on the underside of the cover elements 7, so that the upper shell area 15 extends around the cover elements 7. On the cover 39, the two cover elements 7 are arranged on both sides of the core retaining strip 3. The cover 39 serves as a stop for the cover elements 7 when the core shell 9 is placed. The thickness of the cover elements 7 corresponds to the distance between the cover 39 and the top edge 19 of the core shell. Alternatively, the thickness can be chosen so that the cover elements 7 project beyond or are recessed from the top edge 19.

[0078] A screw, acting as a second connecting element 23, engages from below through a through hole into the internal thread 57 of the cover element 7. The shank tip 59 of the screw is advantageously flush with the top surface 25 of the cover element 7 or slightly countersunk in the case of through holes with internal thread 57.

[0079] During assembly of the mold core 5, its two cover elements 7 are first attached to both sides of the core holder strip 3 using the first connecting elements 21 by placing them onto the bolts passing through the core holder strip 3. It is also possible to first insert the first connecting elements 21 into one of the cover elements 7, then guide the connecting elements through the core holder strip 3, and then attach the other connecting element 7. Alternatively, a bolt can first be inserted into each of the cover elements 7, and the cover elements 7 and the core holder strip 3 can then be joined together. The core shell 9 is then placed on top and screwed to the cover elements 7 using the screws as the second connecting elements 23 through the open bottom of the core shell 9. Disassembly is carried out in reverse order.

[0080] Fig. Figure 8 shows a three-dimensional view of yet another embodiment of a mold core 5 in a top-down oblique view, which is very similar to the previous embodiment. For clarity, one shell half 11 and one of the cover elements 7 have been removed. The core holder strip 3 is not shown.

[0081] This embodiment differs from the previously described embodiment. Fig. 6 and Fig. 7 simply by attaching two dirty sheet metal plates 45, which form the ceiling 39 inside the core shell 9. The core shell plate 9 has outwardly projecting lugs 41 that engage in corresponding recesses 43 of the shell halves 11. During assembly, the shell halves 11 are joined and connected so that the lugs 41 of the plate positioned between them engage in the recesses 43. No further fixing of the plate is required.

[0082] The connection to the core support strip 3 is also made here by the first connecting elements 21, which are designed as bolts and project into blind holes 53 in the cover elements 7. With the core shell 9 in place, the cover elements 7 rest on the ceiling 39, which acts as a stop. The core shell 9 is fastened by second connecting elements 23, designed as screws, running vertically through the ceiling 39 and into the cover elements 7 via the open bottom of the core shell 9. The connection is therefore simple: insert, screw, and the connection is secure. Welding is not required. It is conceivable to subsequently close the core shell with a base.

[0083] Fig. Figure 9 shows a further embodiment of a mold core 5 for a concrete block mold with a mold cavity in a three-dimensional representation. Fig. 10 and Fig. Figure 11 shows exploded views of this mold core 5. For clarity, the core holder strip is not shown. The figures are described together below. In this embodiment, the core shell 9 is not attached to cover elements 7, but to connecting elements 60 that engage through a core holder strip.

[0084] The molded core 5, attached to the core holder strip, comprises two cover elements 7 and a core shell 9. Detachable fasteners 60 (in Fig.(9 not visible) with several components are arranged on both sides of the core holder strip. They extend transversely to a longitudinal direction of the core holder strip and engage through the core holder strip. The connecting elements 60 comprise cuboid blocks 63 with a continuous, vertical internal thread 67, and bolts 65 connecting two blocks 63 each. These bolts extend transversely and engage laterally with their end faces into the blocks 63. Alternatively, a block and the bolt can be formed as a single component. The bolts 65 engage through the holes in the core holder strip, and the blocks 63 are attached to their two end faces. Two pairs of blocks 63 are provided for fastening the mold core 5, each pair being connected by a bolt 65.

[0085] A cover element 7 is provided on both sides of the core holder strip, so that the core holder strip runs through a gap 27 between the cover elements 7. The cover elements 7 have blind-shaped recesses 69 on their upper surfaces 25, the positions of which correspond to those of the blocks 63, so that the blocks 63 are at least partially, and advantageously completely, recessed in the recesses 69. Through holes 71 for screws are provided at the bottom of the recesses 69. The cover elements 7 are open on their underside.

[0086] A trough-shaped core shell 9 is arranged beneath the cover elements 7. The internally hollow core shell 9 has struts 73 with internal threads 79 on its upper surface. A projecting web 75, which serves as a stop, is located at the edge of the core shell 9.

[0087] When assembling the mold core 5, the cover elements 7 are placed on top of the core shell 9, so that the web 75 engages in the cover elements 7 and thereby aligns the components so that their side walls are flush. The assembled cover elements 7 and core shell 9 are placed onto the connecting elements 60, which extend through the core holder strip, so that the blocks 63 engage in the recesses 69 of the cover elements 7. The internal threads 67, 79 and holes 71 of the components are aligned with each other. The connection is made by screws as connecting elements 77, which engage in the internal threads 67 of the blocks 63, through the holes 71 of the cover elements 7, and in the internal threads 79 of the core shell 9. Advantageously, the cover elements 7 do not have internal threads to avoid over-tightening of the connection. The cover elements 7 are thus clamped between the blocks 63 and the core shell 9.Since the recesses 69 enclose the blocks 63 laterally, their position is locked and they cannot detach from the core holder strip or from the bolts 65.

[0088] Although the core shell 11 has a bottom, an alternative embodiment can be open at the bottom.

[0089] Instead of a web 75 on the core shell 9 that engages in the cover elements 7, an alternative embodiment has cover elements 7 that are at least partially recessed in the core shell 9, as described in connection with the preceding embodiments.

[0090] The features specified above and in the claims, as well as those discernible from the illustrations, can be advantageously implemented both individually and in various combinations. The invention is not limited to the described embodiments but can be modified in many ways within the scope of expert knowledge. Reference sign 1 mold nest 3 core holder strip 5 mold core 7 Cover element 9 Nuclear envelope 11 Half of the shell 13 joint 15 upper shell area 17 lower shell area 19 Top edge 21 first connecting element 23 second connecting element 25 Top 27 gap 29, 49 sinkhole 31 first through hole 33 second through hole 35 third through hole 37 Cavity 39 ceiling 41 Nose 43 recess 45 plate 47 Screw nut 51 Floor 53 Blind hole 55th edition 57 internal threads 59 shaft tip 60 Fasteners Block 63 65 bolts 67, 79 internal thread 69 recess 71 holes 73 Strut 75 Bridge 77 Connecting element 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] WO 2012025392A1

[0004]

Claims

Concrete block mold for the production of concrete form blocks, comprising a mold cavity (1), a core holder strip (3) spanning the mold cavity (1) horizontally, and a mold core (5) arranged within the mold cavity (1) and attached to the core holder strip (3), the mold core comprising cover elements (7) and a core shell (9), wherein the cover elements (7) are arranged on both sides of the core holder strip (3) and are attached to the core holder strip (3) by means of at least one detachable connecting element (21), wherein the connecting element (21) engages transversely to a longitudinal direction of the core holder strip (3) into at least one of the cover elements (7) and into the core holder strip (3), wherein the core shell (9) is detachably connected to the cover elements (7), and the connection between the cover elements (7) and the core shell (9) can be established when the cover elements (7) are attached to the core holder strip (3). Concrete block mold for the production of concrete form blocks, comprising a mold cavity (1), a core holder strip (3) spanning the mold cavity (1) horizontally, and a mold core (5) arranged within the mold cavity (1) and attached to the core holder strip (3), which includes cover elements (7) and a core shell (9), detachable connecting elements (60) arranged on both sides of the core holder strip (3) and which engage in or through the core holder strip (3) transversely to a longitudinal direction of the core holder strip (3), wherein the cover elements (7) are arranged on both sides of the core holder strip (3), wherein the core shell (9) is detachably connected to the connecting elements (60) so that the cover elements (7) are arranged between the connecting elements (60) and the core shell (9) and the connection between the core shell (9) and the connecting elements (60) can be established when connecting elements (60) engage in or through the core holder strip (3). Concrete block mold according to claim 1, wherein the cover elements (7) each have a top surface and wherein the connecting element (21) engages in at least one of the cover elements (7) below its top surface (25), and wherein the core shell (9) is arranged on undersides of the cover elements (7) which are facing away from the top surfaces (25). Concrete block mold according to claim 2, wherein the cover elements (7) each have a top surface (25) and wherein the connecting means (60) engage in the top surface of the cover elements (7), and wherein the core shell (9) is arranged on the undersides of the cover elements (7) which are facing away from the top surfaces (25). Concrete block mold according to one of the preceding claims, wherein the connecting elements (21) or the connecting means (60) pass through a neutral fiber of the core holder strip (3). Concrete block mold according to one of the preceding claims, wherein the cover elements (7) are arranged at least partially recessed in the core shell (9) or are arranged resting on the upper side of the core shell (9). Concrete block mold according to one of the preceding claims, wherein the core shell (9) has a stop inside or on its upper side against which the cover elements (7) abut. Concrete block mold according to one of the preceding claims, wherein the at least one connecting element (21) is a first connecting element (21) and the connection between the cover elements (7) and the core shell (9) is made by detachable, second connecting elements (23) which in particular run substantially vertically and perpendicularly. Concrete block mold according to one of the preceding claims, wherein the first connecting element (21) is a bolt or screw which extends into a cavity below the top surface (25) of at least one of the cover elements (7). Concrete block mold according to one of claims 8 and 9, wherein the second connecting elements (23) are screws which are screwed into the underside of the cover elements (7) and engage through the core shell (9) into the cover elements (7), in particular into internal threads (57) which are provided on the cover elements (7). Concrete block mold according to one of claims 8 and 9, wherein the second connecting elements (23) are screws which are screwed into the top elements (7) from the tops (25) and engage through the top elements (7) into the core shell (9). Concrete block mold according to claim 11, wherein the core shell (9) has a ceiling (39) on which an internal thread is provided, and the cover elements (7) are arranged on the ceiling (39). Concrete block mold according to one of claims 8 to 12, wherein the core shell (9) is open or closed on the underside. Concrete block mold according to one of claims 1 to 7, wherein the connection between the core shell (9) and the connecting means (60) is made by third connecting elements (77), in particular screws, which extend from the connecting means (60) through the cover elements (7) into the core shell (9). Concrete block mold according to one of the preceding claims, wherein two cover elements (7) are provided, the outer contours of which follow the contour of the core shell (9) beyond the core retainer strip (3).

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