Turnbuckle for tensioning frame formwork elements

Abstract

The invention relates to a turnbuckle (1) for bracing frame formwork elements (2), comprising a first clamping device (7) which has a crossmember (9) and a first clamping jaw (10). The crossmember (9) has a toothed section (12) comprising a row of track teeth (13) which are arranged one behind the other and extend in parallel with one another. The turnbuckle (1) furthermore has a second clamping device (8) with a second clamping jaw (14) and a guide device (19). The second clamping device (8) can be moved in a bracing direction along the crossmember (9) towards the first clamping jaw (10). The turnbuckle (1) further has a wedge (20) which can be displaced in a guided manner by the guide device (19) along a wedge insertion direction and can be brought into engagement with at least one of the track teeth (13) in order to fix the two clamping devices (7, 8) in a bracing position with respect to one another. The guide device (19) has a transverse bolt (21) which can be displaced transversely to the wedge insertion direction between an unlocking position and a locking position. The crossmember (21) is designed and arranged in such a way that the transverse bolt (21) in the locking position delimits a stroke of the wedge (20) in a direction orthogonal to the toothed section (12) in such a way that the wedge (20) in the clamping position can be brought into engagement with the at least one track tooth (13). The crossmember (21) enables a greater stroke of the wedge (20) in the unlocking position.

Description

[0001] Turnbuckle for tensioning frame formwork elements

[0002] This application claims priority from German patent application No. 10 2022 107 429.3, the contents of which are incorporated herein by reference.

[0003] The invention relates to a turnbuckle for tensioning frame formwork elements according to the preamble of claim 1.

[0004] A turnbuckle of this type is known from WO 2005 / 007997 A1.

[0005] Frame formwork elements are used to construct boundaries for bodies to be cast, especially concrete structures, such as building sections. To create castable boundaries, several frame formwork elements must usually be firmly connected or braced together. Turnbuckles, also known as alignment locks or formwork locks, are used to brace the frame formwork elements.

[0006] Turnbuckles are generally used to connect adjacent frame formwork elements flush, aligned, and tightly. Turnbuckles are particularly used to connect or brace two adjacent frame formwork elements. Turnbuckles can also be used to connect inside corners, outside corners, articulated corners, and stop end formwork.

[0007] Turnbuckles can also be used to connect a frame formwork element to an adjacent compensation element. Compensation elements are used to compensate for length differences and are typically arranged between two conventional frame formwork elements. The compensation elements are usually made of wood, steel, or aluminum.

[0008] Conventional panel formwork elements comprise a surrounding frame with at least two vertical frame elements and two horizontal frame elements, as well as horizontal struts to stabilize the frame. The struts generally run horizontally between the two vertical frame elements. Vertical struts may also be provided to further stabilize the frame. Compensation elements may have a different structure, but they usually also feature a surrounding frame.

[0009] A formwork skin is or can be attached to the frame in a known manner. Compensation elements also represent frame formwork elements within the scope of the present invention.

[0010] Turnbuckles are typically positioned at the intersection of horizontal struts and vertical frame elements. Each turnbuckle clamp grips a section of a vertical frame element of two panel formwork elements to be connected. A wedge then clamps the two clamping jaws, and thus the panel formwork elements, against each other, i.e., the clamping jaws are moved toward each other.

[0011] The turnbuckle typically comprises a crossbeam and a first clamping jaw, which is typically immovably connected to the crossbeam. Furthermore, the turnbuckle comprises a second clamping jaw, wherein the second clamping jaw is movable in a clamping direction along the longitudinal axis of the crossbeam toward the first clamping jaw in order to clamp the panel formwork elements.

[0012] The clamping jaws preferably each have two claws, wherein the two claws of a clamping jaw are spaced apart from one another such that a horizontally extending strut can be accommodated between the two claws.

[0013] Such clamping jaws are also called claws.

[0014] In turnbuckles known from the prior art, it is usually provided that the direction of translation of the wedge when driven into the turnbuckle during clamping (hereinafter also referred to as the wedge insertion direction) or when releasing the wedge and the clamping direction, i.e., the movement of the second clamping device along the crossbeam, are at right angles to one another. If two horizontally adjacent frame formwork elements are connected in the usual way with such a turnbuckle, i.e., clamped horizontally, the force of gravity acts fully on the wedge in such a way that it is pulled in the direction of stronger clamping. This has proven advantageous.

[0015] To clamp the interfaces between two adjacent panel formwork elements that are subject to particularly high forces, such as hinged or outside corners, several turnbuckles are used adjacent to each other. The turnbuckles are then typically arranged in a straight line, e.g., one below the other, i.e., vertically offset from each other, with parallel clamping movements of the clamping jaws.

[0016] However, this arrangement can result in the wedges of the individual turnbuckles interfering with each other. Furthermore, care must be taken to ensure that the wedge ends, which are driven in and released by hammers, are sufficiently spaced from any obstruction, so that operation with a hammer is possible without interference.

[0017] Another disadvantage of conventional turnbuckles is that they usually cannot be mounted on the lowest strut, as there isn't enough space there. The wedge requires space below the crossbeam, into whose toothed section the wedge is to be driven, so that the wedge can protrude below the crossbeam. After the wedge has been driven in, there must also be enough space left to allow the wedge to be released again by hammering it in the opposite direction.

[0018] Another important requirement for turnbuckles is that they should be suitable for connecting panel formwork elements whose frames have different thicknesses, for example depending on whether outside corners, articulated corners or the like are to be connected. For this purpose, it is advantageous if the turnbuckle has a quick adjustment so that the distance between the two clamping jaws of the turnbuckle can be quickly and easily set to the desired size, the turnbuckle attached and then the panel formwork elements clamped. The turnbuckles should therefore have a suitable span that can be adjusted quickly. At the same time, however, it is also required that high forces can be applied at short notice so that the turnbuckle, when attached to two panel formwork elements, can reliably fix or clamp them.The aforementioned turnbuckles, which are tightened with a combination of hammer and wedge, have proven to be suitable for this purpose.

[0019] Turnbuckles that can be operated without the use of impact tools are also known from the state of the art. These include length adjustment via a spindle, but this does not allow for quick adjustment.

[0020] In practice, turnbuckles have become established in which the two clamping jaws, as described above, can be moved toward each other and clamped together using a wedge that is driven in by a striking tool. Such turnbuckles have become established because, on the one hand, these turnbuckles ensure a flush, aligned, and tight connection between panel formwork elements, and, on the other hand, they allow for quick adjustment to adapt the turnbuckles to different spans between the frames of the panel formwork elements to be connected.

[0021] Such a turnbuckle is disclosed in the generic document. The generic document describes that the direction in which the wedge is driven into the turnbuckle and the clamping direction form an angle of a < 90° to improve wedge operation. Typically, however, the angle for such turnbuckles is a = 90°. The present invention is based on the object of improving the prior art, in particular to provide a turnbuckle for clamping panel formwork elements that can be released quickly and easily, even in installation situations that are difficult to access.

[0022] This problem is solved by the features of claim 1.

[0023] The turnbuckle according to the invention for bracing panel formwork elements comprises a first clamping device, comprising a cross member and a first clamping jaw. The cross member has a toothed section with a row of track teeth arranged one behind the other and running parallel to one another. Furthermore, a second clamping device, comprising a second clamping jaw and a guide device, is provided. The second clamping device is displaceable in a bracing direction along the cross member in the direction of the first clamping jaw. The turnbuckle further comprises a wedge, which, guided by the guide device, can be displaced along a wedge-engaging direction and brought into engagement with at least one of the track teeth in order to fix the two clamping devices in a bracing position.

[0024] According to the invention, the guide device comprises a crossbar that can be displaced transversely to the wedge insertion direction between an unlocking position and a locking position. The crossbar is designed and arranged such that, in the locking position, the crossbar limits the travel of the wedge in a direction orthogonal to the toothed section such that, in the clamping position, the wedge can be brought into engagement with the at least one track tooth, and wherein, in the unlocking position, the crossbar enables a greater travel of the wedge.

[0025] Because the turnbuckle according to the invention has a crossbar, the movement of which between an unlocking position and a locking position can influence a stroke that the wedge can execute in a direction orthogonal to the toothed section, the turnbuckle according to the invention can be released easily when it clamps two frame formwork elements together, i.e. is in the clamping position, even when the turnbuckle is mounted in a forced position in which the wedge cannot be released again by hammer blows against the direction of wedge impact. Such a forced position can occur, for example, in frame formwork elements in which the turnbuckle is attached to a lower horizontal strut or when several turnbuckles are mounted one above the other in a straight line with a short distance between them.A predicament in which the wedge cannot be released by hammer blows against the wedge's driving direction or cannot be easily released by hammer blows against the wedge's driving direction can occur particularly in frame formwork elements that form foundation formwork, or in frame formwork elements that have only a small vertical height, for example, in frame formwork elements used to construct foundations, e.g., train tracks. The turnbuckle according to the invention is particularly suitable for frame formwork elements used to manufacture wall formwork.

[0026] The inventive solution eliminates the need to operate the wedge to release the turnbuckle from the clamping position. It can be easily released using the crossbar. This allows the wedge to drop out of the clamping position or be removed without any force being required.

[0027] The operation of the turnbuckle according to the invention, in particular the operation of the crossbar to release the two clamping devices when they are fixed in a clamping position relative to each other, is quick and easy. An additional tool for operating the crossbar is not necessary. Manual operation or, if necessary, operation using the available tool, in particular a hammer, is sufficient to move the crossbar, in particular to shift it from a locked position to an unlocked position.

[0028] To fix the clamping device in a clamping position, it can be provided that the crossbar is first moved into the locking position in such a way that the crossbar limits a stroke of the wedge in a direction orthogonal to the toothed section in such a way that the wedge can be brought into engagement with the at least one, preferably two, track teeth in the clamping position. For this purpose, the wedge can be driven into the toothed section in a known manner, preferably using a hammer. The wedge is moved in the wedge driving direction. The operation of the turnbuckle, in particular in order to fix the two clamping devices or the two clamping jaws in a clamping position relative to one another using the wedge, can be carried out in a known manner. To release the fixation of the two clamping devices from the clamping position, it can then be provided that the wedge is again moved in the opposite direction, ieopposite to the wedge driving direction, from the toothed section by hammer blows. Alternatively, in particular when a constrained position exists, the clamping device can also be released from the clamping position according to the invention by moving the crossbar from its locking position, in which it limits the stroke of the wedge in a direction orthogonal to the toothed section such that the wedge is in engagement with at least one of the track teeth, into an unlocking position in which the crossbar enables a greater stroke of the wedge. Because the crossbar enables a greater stroke of the wedge in a direction orthogonal to the toothed section, i.e. because the wedge can move further away from the toothed section in an orthogonal direction, the toothing engagement between the wedge and the respective track tooth(s) of the toothed section is at least loosened.The wedge can thus be moved out of the toothed section without the need for hammer blows or greater force.

[0029] The wedge's stroke in a direction orthogonal to the tooth engagement also occurs orthogonally to the wedge's longitudinal axis or the wedge insertion direction. It is advantageous if the crossbar, in the unlocked position, allows the wedge to stroke in such a way that the wedge's engagement with the track teeth in the clamping position is at least reduced.

[0030] It may be sufficient to release the turnbuckle if the crossbar, in the unlocked position, at least reduces the wedge's engagement with the track teeth. This can, for example, lead to the wedge being able to be released without the need for hammer blows.

[0031] It is advantageous if the crossbar in the unlocking position increases the stroke of the wedge so that the wedge can be brought out of engagement with the track teeth in the clamping position.

[0032] A design of the crossbar such that, in the unlocked position, the wedge's stroke is increased to such an extent that the wedge is disengaged from the track teeth in the clamping position has proven particularly suitable. This allows the clamping devices to be released even if the wedge is not moved against the impact movement or in the opposite direction to the wedge's impact direction.

[0033] The turnbuckle according to the invention thus makes it possible to release a fixation of the turnbuckle in a position in which it clamps two frame formwork elements together in two different ways, on the one hand by moving the wedge axially against the wedge driving direction by hammer blows and on the other hand by moving or moving the crossbar from a locking position to an unlocking position.

[0034] It is advantageous if the crossbar interacts with the wedge in such a way that, depending on the position of the crossbar, the crossbar acts on the wedge in such a way that a stroke of the wedge is mechanically limited, preferably by direct contact between the wedge and the crossbar or with the aid of one or more intermediate elements, for example a wedge contact rail described in more detail below.

[0035] It is advantageous if the wedge limits the wedge's stroke in the locking position such that the wedge cannot perform any stroke when it is driven into the toothed section up to the clamping position, i.e., the stroke in the clamping position is zero. By moving the crossbar from its locking position to the unlocking position, the stroke is then increased, i.e., a stroke is set that is greater than the stroke the wedge can assume when the crossbar is in the locking position.

[0036] It can be provided that the stroke of the wedge, which it can assume when the crossbar is in the unlocked position, corresponds to a value that is greater than 10% of the amount of the toothing depth of the track teeth. The toothing depth is understood to be the distance between the tip of the track teeth and the valley of the track teeth or the tip of a track tooth and the root of a track tooth. More preferably, the stroke is at least 20%, even more preferably at least 30%, in particular at least 50%, of the toothing depth. In a very special way, it can be suitable if the stroke is the same size, in particular greater, than the toothing depth, so that the toothing of the wedge, which is in engagement with at least one of the track teeth when the wedge is driven into the clamping position, can be brought completely out of engagement with the track teeth.

[0037] It is advantageous if the stroke that the wedge can take when the crossbar is in the unlocking position is less than twice the toothing depth, preferably less than 150%, in particular less than 120% of the toothing depth.

[0038] The stroke of the wedge refers to the movement of the wedge orthogonal to the toothed section in a direction away from the toothed section. If the stroke is zero, which is preferably the case when the wedge is engaged in a clamping position such that the two clamping devices are fixed relative to each other, the wedge cannot be moved in a direction orthogonal to the toothed section.

[0039] It is advantageous if the crossbar can be moved parallel to the clamping direction between an unlocking position and a locking position.

[0040] A displacement of the crossbar parallel to the bracing direction has proven to be particularly suitable for influencing a stroke by a movement of the crossbar, which the wedge can perform in a direction orthogonal to the bracing section.

[0041] It is advantageous if the guide device has a housing part with at least two guide recesses which are arranged at a distance from one another in the wedge driving direction and through which the wedge is passed, wherein the guide recesses guide the wedge in the wedge driving direction, and wherein the crossbar is arranged on the housing part so as to be displaceable transversely to the wedge driving direction.

[0042] Because the guide device has a housing part with at least two guide recesses through which the wedge is passed, the wedge can be moved in a particularly advantageous manner in the wedge-driving direction, in particular brought into a bracing position or driven in, so that the wedge or the toothing of the wedge is brought into engagement with one of the track teeth in such a way that the two clamping devices or the two clamping jaws are fixed to one another. It has proven particularly suitable if the crossbar is arranged on the housing part so that it can be moved transversely to the wedge-driving direction. Such an arrangement can be implemented in a particularly stable and reliable manner. This is particularly advantageous for robust use and with regard to the requirements on construction sites.

[0043] According to the invention, the housing part and / or the crossbar can have a U-shaped cross-section. It has proven advantageous if the housing part and the crossbar have an at least approximately U-shaped cross-section.

[0044] It can be advantageous if the crossbar is fixed to the inside of the housing part.

[0045] It is further advantageous if the crossbar, which is preferably U-shaped in cross section, is arranged in the housing part, which is also preferably U-shaped in cross section, such that the housing part and the crossbar are oriented identically, preferably such that a longitudinal axis of the crossbar and a longitudinal axis of the housing part run transversely to the wedge insertion direction. The longitudinal axes extend along the bottom of the respective U-shaped profile from a front end to a rear end of the crossbar or the housing part, so that the longitudinal axes on the bottom run centrally between the side walls of the U-shaped profile.

[0046] The housing part or the guide device are preferably formed integrally with the second clamping device. The two side walls of the second clamping jaw are preferably each integrally connected to a side wall of the U-shaped profile of the housing part and extend in a direction facing away from the bottom of the U-shaped profile of the housing part. Alternatively, however, the second clamping jaw can also be connected to the guide device or the housing part in another way, in particular by a material or force fit, for example, welded or screwed.

[0047] It is advantageous if a wedge contact rail is movably arranged in the guide recesses such that the wedge contact rail can carry out a lifting movement orthogonal to the toothed section, wherein the wedge contact rail is arranged in the guide recesses on a side of the wedge facing away from the toothed section, such that an underside of the wedge contact rail adjoins an upper side of the wedge and wherein the cross bar is arranged on the housing part such that the cross bar adjoins an upper side of the wedge contact rail facing away from the wedge and the cross bar limits the stroke of the wedge contact rail.

[0048] The use of a wedge contact rail has proven particularly suitable for providing good guidance for the wedge, so that the wedge can be moved in the wedge insertion direction, i.e. brought into the clamping position or returned from the clamping position by a counter-movement. For this purpose, the wedge contact rail itself is arranged so that it can move in the guide device that the wedge contact rail can perform a lifting movement (orthogonal to the toothed section). The wedge contact rail is positioned in the guide recess such that an underside of the wedge contact rail borders on an upper side of the wedge. Furthermore, the cross bar borders on an upper side of the wedge contact rail facing away from the wedge, so that the cross bar limits the stroke of the wedge contact rail and thus also the stroke of the wedge.The crossbar is thus moved from an unlocked position to a locked position relative to, in particular with contact, the wedge contact rail, so that the wedge contact rail is moved closer to the toothed section in the locked position. In the unlocked position, the crossbar provides the wedge contact rail with an increased stroke, so that the wedge contact rail can be moved away from the toothed section.

[0049] The wedge guide rail enables the two parts, each of which is movable along its longitudinal axis, namely the wedge, which moves in the wedge driving direction, and the crossbar, which is moved transversely to the wedge driving direction, not to have a direct mechanical effect on the other part during their respective movements, but rather the movement takes place in relation to the wedge guide rail, which thus functions as an intermediate layer or intermediate element.

[0050] The wedge support rail is preferably designed in one piece, but can also be designed in several pieces.

[0051] It is advantageous if the guide recesses have a shoulder against which the wedge guide rail rests when the crossbar is in the locked position. The underside of the wedge guide rail rests against the shoulders of the guide recess. This limits movement of the wedge guide rail toward the toothing section, preventing the wedge guide rail from pushing the wedge too far into the track teeth or the toothing section.

[0052] According to the invention, it can further be provided that the crossbar has, on its underside facing the wedge, a control surface extending at least over a partial length of the crossbar, which control surface limits the stroke of the wedge in the guide recesses to different values ​​depending on the position of the crossbar.

[0053] It has proven particularly advantageous if the crossbar has a control surface extending at least over a partial length of the crossbar. The control surface preferably runs along the longitudinal axis of the crossbar or parallel to the displacement movement of the crossbar in order to move it between the unlocked position and the locked position, i.e., transversely to the wedge insertion direction.

[0054] Preferably, the control surface extends over at least 50% of the length of the cross bar, particularly preferably over at least 70%, in particular over at least 80% and particularly preferably over at least 90% of the length of the cross bar.

[0055] Because the crossbar has a control surface on its underside which limits the stroke of the wedge in the guide recesses to different values ​​depending on the position of the crossbar, in particular in such a way that in the locking position, when the wedge is driven into a clamping position, there is no stroke, while in the unlocking position of the crossbar there is a stroke by which the engagement of the wedge in the track teeth is reduced or released, the fixation between the two clamping devices can be released particularly easily or the crossbar can be moved particularly easily from an unlocking position into a locking position and vice versa.

[0056] Control surfaces can be implemented on the underside of the crossbeam using known methods, in particular by selecting a suitable pitch. The control surface can act directly on the wedge or via an intermediate element, in particular the wedge support rail described above.

[0057] The horizontal displacement of the crossbar can be designed in such a way that, in the locked position, a range is provided to compensate for tolerances and wear, for example, of up to 10°. This can be achieved, in particular, by using a control surface with a corresponding inclination.

[0058] According to the invention, it can be provided that the control surface of the

[0059] Crossbar has at least a first section which, when the crossbar is brought into contact with the upper side of the wedge contact rail or the upper side of the wedge in the locking position, limits a stroke of the wedge in a direction orthogonal to the toothing section such that the wedge can be brought into engagement with the track teeth and wherein the control surface has a second section which, when the crossbar is brought into contact with the upper side of the wedge contact rail or the upper side of the wedge in the unlocking position, enables a greater stroke of the wedge.

[0060] The design of the control surface with a first and a second section has proven to be particularly suitable.

[0061] It can be provided that the sections, in particular the first section, have a gradient, i.e., that the distance between the first section of the control surface and the toothed section of the cross member changes over the course of the first section. The second section can also have a gradient, but is preferably designed without a gradient.

[0062] The design of the control surface in the first section such that a gradient is provided makes it possible to respond to wear of the toothed section, the wedge, the wedge contact rail and / or the cross bar in such a way that the cross bar is moved further towards the locking position if wear has occurred over time. The locking position of the cross bar preferably provides that the wedge can be introduced into the toothed section in the wedge driving direction into a clamping position such that there is no longer any stroke in the clamping position. It is therefore advantageous if the first section of the control surface of the cross bar is designed such that the locking position can be suitably selected within the first section. According to the invention, it can further be provided that the control surface has a transition section between the first section and the second section.

[0063] It has proven suitable if a transition section is formed between the two sections of the control surface, which transition section can be characterized in particular by having a greater gradient than the first section. This makes it possible to transition between the unlocked position and the locked position over a comparatively short distance. This is particularly suitable if the first section also has a gradient, so that, despite tolerances and wear, the crossbar can be brought into a position in which the wedge is brought into engagement with at least one of the track teeth of the toothed section in such a way that there is no longer any stroke in the clamped position.

[0064] The crossbar preferably has a U-shaped profile in cross section, as described. Preferably, the control surface is formed on the undersides or the free ends of the side walls of the U-shaped cross member. The undersides of the side walls are identically formed.

[0065] It is advantageous if the crossbar is arranged on an inner side of the housing part of the guide device.

[0066] It has proven particularly suitable if the crossbar is arranged on an inner side of the housing part of the guide device, in particular if the housing part encloses the crossbar in a U-shape.

[0067] According to the invention, it can further be provided that the crossbar has at least one, preferably several, in particular two, elongated holes, with the aid of which the crossbar is displaceably arranged on the housing part, preferably screwed, and wherein the elongated holes limit a movement of the crossbar transversely to the wedge driving direction.

[0068] It has proven particularly suitable if the crossbar has one, in particular two elongated holes, with the aid of which and with the aid of suitable screws or rivets the crossbar is arranged such that it can be moved on the housing part. The elongated holes can limit the movement of the crossbar transversely to the wedge driving direction. The elongated holes thus extend transversely to the wedge driving direction or run along the longitudinal axis of the crossbar. The crossbar can therefore also be installed and replaced particularly advantageously if necessary. Furthermore, two elongated holes in conjunction with suitable fastening elements enable a defined and robust movement of the crossbar transversely to the wedge driving direction, i.e. from the unlocked position to the locked position and vice versa. According to the invention it can further be provided that the wedge and / or the wedge contact rail are arranged captive in the guide recesses.

[0069] It has proven advantageous for handling if the wedge is arranged captively in the guide recesses. For this purpose, the wedge can preferably have angled portions at both ends to prevent the wedge from being completely pulled out of the guide recess. The angled portions are preferably selected such that an inner surface of the angled portion comes into contact with the housing part, in particular a housing part surrounding the guide recess, when the wedge is moved to the respective end position.

[0070] The wedge guide rail can be designed in a similar way to the wedge. Preferably, an additional component is welded to the wedge guide rail, which extends plane-parallel to a surface of the guide recess or a side wall of the housing part and protrudes beyond the respective guide recess.

[0071] Preferably, the wedge is first inserted into the guide recesses, which, if the wedge contact rail has not yet been inserted, provide sufficient space in a direction orthogonal to the toothed section to insert the wedge. The wedge contact rail is then inserted into the guide recesses. The wedge contact rail can preferably already have a projection at one end, so that a positive connection with the housing part or an edge of the corresponding guide recess is produced in a direction of movement along the longitudinal axis of the wedge contact rail. A projection or an end stop can then be attached to the other end of the wedge contact rail, for example by riveting, welding or screwing, preferably after the wedge contact rail has been inserted into the guide recesses.It is also possible to form an end stop by forming, so that the wedge contact rail is positively received in the two guide recesses, preferably with as little play as possible with respect to a movement along its longitudinal axis, or so that a movement of the wedge contact rail along its longitudinal axis is largely prevented.

[0072] It is advantageous if the wedge support rail has a support surface on the underside which, together with a support surface formed on the upper side of the wedge, forms a linear guide in order to guide the wedge in the wedge driving direction, wherein the two stop surfaces are preferably designed to be complementary.

[0073] It has proven particularly suitable if the wedge support rail and the wedge form a linear guide, so that the wedge is guided in a defined manner in the wedge insertion direction. The stop surfaces can preferably be designed to complement each other, for example, such that one stop surface has grooves and the other stop surface has tongues that engage with each other. Recesses and / or projections can also be provided on the stop surfaces, which are designed to form a linear guide.According to the invention, it can further be provided that the contact surface for the wedge formed on the underside of the wedge contact rail, viewed in cross section, has a recess, wherein the recess is preferably designed as a trapezoidal recess, as a triangular recess, as a recess with rounded edges, as a circular recess, as a rounded recess or by grooves, and / or viewed in cross section, the recess has a flat bottom from which side walls extend in the direction of the wedge, which side walls run outwards at an angle of 30° to 60°, preferably of 45°, to the bottom.

[0074] It has proven particularly suitable for forming a linear guide for the wedge if the wedge support rail has a recess, preferably a trapezoidal recess, when viewed in cross-section. The trapezoidal recess is preferably designed such that, starting from the bottom of the trapezoidal recess, side walls run towards the wedge and extend outwards at an angle of 30° to 60°, preferably 45° + / - 5°, to the bottom, so that the trapezoidal recess opens outwards from the bottom towards the wedge. Compared to a shape in which the side walls are at an angle of 90° to the bottom of the recess, such a shape has proven particularly suitable for guiding the wedge. The wedge is preferably designed such that it has side walls which rest against the side walls of the trapezoidal recess, each viewed in cross-section.

[0075] Due to the recess, in particular the trapezoidal shape or the trapezoidal recess, in particular with a 45° angle, the wedge can rest optimally on the contact surface and a complete load transfer is achieved.

[0076] It is advantageous if the contact surface formed on the upper side of the wedge has side walls which run complementarily to the side walls of the contact surface of the wedge contact rail, wherein the contact surface of the wedge preferably has obliquely running side walls which preferably run correspondingly to the side walls of the recess in the wedge contact surface at an angle of 30° to 60°, particularly preferably at an angle of 45°.

[0077] Such a design has proven particularly suitable for guiding the wedge in the preferably trapezoidal recess of the wedge guide rail. This provides good linear guidance in the wedge insertion direction for driving in and releasing the wedge in the opposite direction. Furthermore, the forces acting in the stroke direction can be absorbed particularly advantageously due to the inclined side walls.

[0078] In a further development of the invention, it can be provided that the contact surface of the wedge, with which the wedge rests on the contact surface of the wedge contact rail, has, viewed in cross section, two V-shaped projections between which there is a V-shaped recess, wherein the two V-shaped projections penetrate into the recess of the contact surface of the wedge contact rail and in each case one side wall of the V-shaped projection adjoins one of the side walls of the contact surface of the wedge contact rail.

[0079] Such a design of the wedge's contact surface, with which the wedge penetrates the recess in the wedge contact rail, has proven particularly suitable. Preferably, the two V-shaped projections are identical in cross-section. Further preferably, the V-shaped recess in the contact surface is located centrally between the two V-shaped projections, viewed in cross-section.

[0080] According to the invention, it can further be provided that the crossbar is displaceable between two end positions transversely to the wedge insertion direction, wherein the crossbar assumes the locking position in the region of a first end position and the unlocking position in the region of a second end position.

[0081] It can be provided that, in particular, the locking position comprises a locking region, in particular to compensate for tolerances and wear. Preferably, the locking position and the unlocking position are located at the end and in the end region of the crossbar, respectively.

[0082] The crossbar is preferably designed such that it is captively received in the housing part. Movement of the crossbar can be limited by the preferably provided elongated holes. However, it can also be provided that the crossbar has angled portions or projections at its end regions, which are designed such that the crossbar abuts the wedge and / or the wedge contact rail with the projections or angled portions in the end positions. The angled portions or projections thus serve as end stops. These end stops preferably abut the wedge contact rail. Further preferably, the end stops limit the movement of the crossbar before the fastening means, in particular the screws, hit the ends of the respective elongated holes. This relieves the load on the screws or the elongated holes.

[0083] The figures each show preferred embodiments in which individual features of the present invention are illustrated in combination with one another. Features of one embodiment can also be implemented independently of the other features of the same embodiment and can therefore be readily combined by a person skilled in the art to form further useful combinations and subcombinations with features of other embodiments.

[0084] In the figures, functionally identical elements are provided with the same reference numerals.

[0085] It shows:

[0086] Figure 1 shows an arrangement of frame formwork elements, wherein the frame formwork elements are clamped together by several turnbuckles according to the invention; Figure 2 shows a perspective view of a turnbuckle according to the invention;

[0087] Figure 3 is a side view of a turnbuckle according to the invention;

[0088] Figure 4 shows a further perspective view of a turnbuckle according to the invention;

[0089] Figure 5 shows a further perspective view of a turnbuckle according to the invention;

[0090] Figure 6 is a perspective view from the front of a turnbuckle according to the invention;

[0091] Figure 7 is a front view of a turnbuckle according to the invention;

[0092] Figure 8 shows a longitudinal section through a turnbuckle according to the invention, wherein a crossbar is in a locking position and the wedge is in the clamping position, so that the wedge engages in track teeth of a toothing section;

[0093] Figure 9 shows a further longitudinal section through a turnbuckle according to the invention, wherein a crossbar is in an unlocking position so that the wedge is out of engagement with the track teeth;

[0094] Figure 10 is a perspective view of the longitudinal section according to Figure 9;

[0095] Figure 11 is an exploded view of a turnbuckle according to the invention;

[0096] Figure 12 is a top view of a turnbuckle according to the invention in a representation showing a horizontal section through a crossbar;

[0097] Figure 13 is a view according to Figure 12, wherein the horizontal section runs below an upper side of the crossbar;

[0098] Figure 14 shows a longitudinal section through a second clamping device of a turnbuckle according to the invention;

[0099] Figure 15 is an enlarged sectional view of the wedge in the clamping position and the crossbar in the locking position, with a wedge support rail positioned between the wedge and the crossbar; and

[0100] Figure 16 is a perspective view of a wedge rail. Figure 1 shows six turnbuckles 1 according to the invention, which connect frame formwork elements 2 to one another. Only a section of the frame formwork element 2 shown on the right in the image plane is shown. Three turnbuckles 1 are provided, for example, to brace the middle frame formwork element 2 with the two outer frame formwork elements 2.

[0101] The turnbuckles 1 according to the invention are basically suitable for connecting or bracing two adjacent frame formwork elements 2 with each other, wherein in particular internal corners, external corners, articulated corners and end formwork can be connected by means of the turnbuckles 1 according to the invention.

[0102] The turnbuckles 1 according to the invention are also suitable for connecting a frame formwork element 2 to an adjacent compensation element. Such compensation elements also constitute frame formwork elements within the scope of the present invention.

[0103] The frame formwork elements 2 to be connected can preferably be made of wood, plastic, steel, or aluminum. In general, the turnbuckles 1 according to the invention can be used to connect adjacent frame formwork elements 2 flush, aligned, and tightly.

[0104] The turnbuckles 1 according to the invention serve in particular to connect two frame formwork elements 2 positioned next to one another, which run in a common plane, as shown in Figure 1.

[0105] The frame formwork elements 2 shown in the exemplary embodiment each have two outer horizontally extending frame elements 3 (in Figure 1, only the lower outer frame elements 3 are shown, but not the upper outer frame elements) and two outer vertically extending frame elements 4, which together form a frame of the frame formwork element 2. Furthermore, horizontally extending struts 5 are provided.

[0106] The turnbuckles 1 according to the invention are generally arranged in the area of ​​intersections of the horizontally extending struts 5 and the vertically extending frame elements 4 of the frame formwork elements 2, as shown by way of example in Figure 1.

[0107] The frame formwork elements 2 have, in a manner not described in detail, a formwork skin or can be connected to a formwork skin which faces the material to be filled and cured.

[0108] The frame formwork elements 2 are preferably frame formwork elements for the production of bodies to be cast, in particular concrete bodies, in particular building components. Such frame formwork elements 2 are well known in the art, which is why they will not be discussed in detail below.

[0109] The exemplary embodiment shows frame formwork elements 2 for wall formwork. The present invention is particularly suitable for frame formwork elements 2 used for foundation formwork.

[0110] The frame formwork elements 2 abut one another in a known manner with an interface. The interface is shown in Figure 1 as boundary line 6 between the middle frame formwork element 2 and the right frame formwork element 2, or between the middle frame formwork element 2 and the left frame formwork element 2.

[0111] In the exemplary embodiment, the boundary line 6 is spanned by three turnbuckles 1, although fewer or more turnbuckles 1 may be provided.

[0112] The turnbuckles 1 also each span a vertically running frame element 4 of the frame formwork elements 2 to be connected to one another. Furthermore, the turnbuckles 1 are preferably arranged on the horizontally running struts 5 of the frame formwork elements 2, in particular as shown in Figure 1.

[0113] The turnbuckles 1 shown in Figures 2 to 13 show a preferred design so that the turnbuckles 1 can encompass the horizontally extending struts 5.

[0114] The turnbuckles 1 shown have a first clamping device 7 and a second clamping device 8.

[0115] The first clamping device 7 has a cross member 9, which is preferably formed integrally with a first clamping jaw 10.

[0116] The first clamping jaw 10 is rigidly or firmly or immovably connected to the cross member 9.

[0117] The cross member 9 has a preferably flat or planar upper surface 11 with a toothed section 12. The toothed section 12 has a plurality of track teeth 13 arranged one behind the other and running parallel to one another.

[0118] The second clamping device 8 is displaceable in a clamping direction (arrow direction A in Figures 2 and 12) along the cross member 9 in the direction of the first clamping jaw 10 (and in the opposite direction).

[0119] If the two clamping devices 7, 8 are not clamped to each other by a wedge 20, which is described in more detail below, the second clamping device 8 can be moved quickly and easily along the crossbeam 9 without any significant effort in order to adjust the turnbuckle 1 to the two frame formwork elements 2 to be connected. This is also referred to as quick adjustment.

[0120] In the exemplary embodiment, the cross member 9 is preferably a tubular element, preferably with a substantially rectangular, in particular square, cross section.

[0121] In the exemplary embodiment, the upper side 11 and the toothed section 12 with the track teeth 13 are preferably formed integrally with the cross member 9.

[0122] The second clamping device 8 of the turnbuckle 1 has a second clamping jaw 14.

[0123] The first clamping jaw 10 and, analogously, the second clamping jaw 14 each have two claws 10a and 14a, respectively. The distance between the claws 10a and 14a is preferably selected such that a horizontally extending strut 5 can be accommodated between the claws 10a and 14a, respectively.

[0124] The second clamping jaw 14 or the second clamping device 8 is displaceable in the clamping direction along the longitudinal axis of the cross member 9 in the direction of the first clamping jaw 10 (and in the opposite direction).

[0125] In the exemplary embodiment, it is provided that the second clamping device 8 is connected in a captive manner to the cross member 9 of the first clamping device 7 or is arranged in a captive manner on the cross member 9.

[0126] For this purpose, it can be provided that a movement of the second clamping device 8 in and / or against the clamping direction is limited by protrusions 15 and / or limit stops 18. The protrusions 15 and / or the limit stops 18 are preferably arranged such that the second clamping device 8 cannot be removed from the cross member 9 in and / or against the clamping direction.

[0127] In the exemplary embodiment, it is preferably provided that the cross member 9 has formations 15 at its two axial ends 9a, 9b. These can preferably be pronounced features (as shown). However, the formations 15 can also be formed by any desired stop elements, e.g. pins, bolts or edges. The formations 15 can interact with correspondingly complementary elements on the second clamping device 8 such that the second clamping device 8 cannot be pulled off the cross member 9 in and / or against the clamping direction. In the exemplary embodiment, the formations 15 interact with limit stops 18 which are formed on the second clamping device 8, preferably by pins or bolts. In the exemplary embodiment, a loss prevention device is shown using formations 15 and limit stops 18, which form a positive-locking loss prevention device in and against the clamping direction.Preferably, one of the limit stops 18 interacts with one of the protrusions 15. Preferably, one, particularly preferably two protrusions 15 are provided at a first axial end 9a of the cross member 9, which interact with one, preferably two limit stops 18 of the second clamping device 8. Preferably, one, particularly preferably two protrusions 15 are provided at the second end 9b of the cross member 9, which interact with one, preferably two limit stops 18 of the second clamping device 8.

[0128] It can also be provided that the formations 15 and the limit stops 18 only limit a movement opposite to the clamping direction.

[0129] A loss protection in the clamping direction can also result from the first clamping jaw 10 and the second clamping jaw 14 colliding with each other, i.e. getting in each other's way in the clamping direction when the second clamping device 8 is displaced to an end point in the clamping direction A.

[0130] In order to move the second clamping device 8 in and against the bracing direction along the longitudinal axis of the cross member 9, the cross member 9 and the second clamping device 8 in the exemplary embodiment preferably form a guide rail or a rail guide which is designed such that the second clamping device 8 can be moved along the longitudinal axis of the cross member 9 in the bracing direction and against the bracing direction. The upper side 11 of the cross member 9, in particular the longitudinal edges of the upper side 11, which for this purpose preferably protrude beyond a first or a second longitudinal side 16, 17 of the cross member 9, can represent parts of the rail guide. The inner side of the second clamping device 8 facing the longitudinal edges of the upper side 11 can be designed to complement the rail guide. In the exemplary embodiment, it is provided that the limit stops 18 engage under the longitudinal edges of the cross member 9.The limit stops 18 thus constitute part of the rail guide. The limit stops 18 also prevent the second clamping device 8 from being lifted off the cross member 9. A specific design of the inside of the second clamping device 8, such that it is complementary to the longitudinal edges of the upper side 11 of the cross member 9, is therefore not necessary in the exemplary embodiment or is realized by the limit stops 18.

[0131] The second clamping device 8 has a guide device 19. The turnbuckle 1 has a wedge 20, which, guided by the guide device 19, can be displaced along a wedge insertion direction and brought into engagement with at least one of the track teeth 13 of the toothed section 12 in order to fix the two clamping devices 7, 8 in a clamping position relative to one another.

[0132] The wedge insertion direction is indicated by arrow B in Figure 2 and Figure 12. In the exemplary embodiment, it is preferably provided that the wedge 20 engages in two track teeth 13 of the toothed section 12 in the clamping position.

[0133] In the exemplary embodiment, the wedge insertion direction is orthogonal to the bracing direction. Preferably, the wedge insertion direction and the bracing direction extend in a plane that is plane-parallel to the upper side 11 of the cross member 9.

[0134] In order to clamp the two clamping devices 7, 8 relative to one another in a clamping position using the wedge 20, the guide teeth 13 are provided at an angle to the wedge insertion direction on the upper side 11 of the cross member 9. The longitudinal axis of the wedge 20 thus does not run parallel to the extension of the guide teeth 13, but at a (slight) angle to it. This is clearly visible in Figures 12 and 13 and is also generally known. This ensures that the guide teeth 13 are brought into engagement with the wedge 20 in a clamping position. Figure 15 shows (enlarged) the clamping position or the engagement of the wedge 20 with the guide teeth 13.

[0135] The guide device 19 has a cross bar 21 which can be moved transversely to the wedge insertion direction between an unlocking position (seen in Figures 9 and 10) and a locking position (seen in Figure 8).

[0136] The crossbar 21 is designed and arranged such that, in the locking position, the crossbar 21 limits a stroke of the wedge 20 in a direction orthogonal to the toothed section 12 such that, in the clamping position, the wedge 20 can be brought into engagement with the at least one track tooth 13. This is illustrated, among other things, in Figure 8 and enlarged in Figure 15. In this exemplary embodiment, the wedge 20 is engaged with two track teeth 13, as shown in Figure 15.

[0137] The cross bar 21 is designed such that the cross bar 21 allows a greater stroke of the wedge 20 in the unlocked position.

[0138] It is provided in the embodiments that the cross bar 21 in the unlocking position enables a stroke of the wedge 20 such that an engagement of the wedge 20 in the track teeth 13 in the clamping position can be at least reduced.

[0139] In the unlocked position, the cross bar 21 increases the stroke of the wedge 20 such that the wedge 20 can be brought out of engagement with the track teeth 13 in the clamping position.

[0140] In the exemplary embodiments, the wedge 20 is shown to have a toothing on its underside. Viewed in cross-section, two projecting teeth 20a are preferably provided, each of which preferably extends over at least 50% of the length of the wedge 20, preferably over at least 80% of the length of the wedge 20. A groove 20b or a depression is located between the teeth 20a. The teeth 20a or the groove 20b of the wedge 20 are designed such that the tooth flanks of the teeth 20a rest against the tooth flanks of the track teeth 13 when the wedge 20 is driven into the clamping position. For this purpose, reference is made to the illustration in Figure 15.

[0141] In order to be able to release the tensioning position again or to be able to remove the turnbuckle 1, it can now be provided that the crossbar 21 is moved from the locking position, in which the crossbar 21 is located when the wedge 20 is driven into the toothed section 12 along the wedge driving direction, into the unlocking position.

[0142] As described, in the unlocking position, the cross bar 21 increases the stroke of the wedge 20 such that the wedge 20 can be brought out of engagement with the track teeth 13 without the wedge 20 having to be moved against the wedge driving direction.

[0143] The wedge 20 can thus be raised orthogonally to the toothing section to such an extent that the teeth 20a on the underside of the wedge 20 and the track teeth 13 are no longer in engagement with one another, i.e., their tooth flanks are no longer in contact. This is illustrated accordingly in Figures 9 and 10. The two clamping devices 7 and 8 can thus be moved counter to the clamping direction, and the turnbuckle 1 can thus be removed from the panel formwork elements 2 without the wedge 20 having to be moved. After the engagement of the wedge 20 in the track teeth 13 is reduced in the unlocked position, or the wedge is preferably completely disengaged from the track teeth 13, the wedge 20 can be moved counter to the wedge insertion direction without great expenditure of force, if necessary also by hand, in order to retract the wedge 20.

[0144] As shown in the exemplary embodiment, the guide device 19 preferably has a housing part 22 with at least two guide recesses 23. The guide recesses 23 are arranged at a distance from one another in the wedge insertion direction. In the exemplary embodiment, the guide recesses 23 represent windows in the side surfaces of the housing part 22, wherein the side surfaces preferably run plane-parallel to one another. The wedge 20 is passed through the guide recesses 23. The guide recesses 23 guide the wedge 20 in the wedge insertion direction.

[0145] The cross bar 21 is arranged on the housing part 22 so as to be displaceable transversely to the wedge insertion direction.

[0146] As can be seen from Figures 2 to 15, a wedge support rail 24 is movably arranged in the guide recesses 23 such that the wedge support rail 24 can perform a lifting movement orthogonal to the toothed section 12. The wedge support rail 24 is arranged in the guide recesses 23 on a side of the wedge 20 facing away from the toothed section 12 such that an underside of the wedge support rail 24 adjoins an upper side of the wedge 20. The cross bar 21 is arranged on the housing part 22 such that the cross bar 21 adjoins an upper side of the wedge support rail 24 facing away from the wedge 20, and the cross bar 21 limits the stroke of the wedge support rail 24. The wedge support rail 24 is thus located between the cross bar 21 and the wedge 20.

[0147] A perspective view of an advantageous embodiment of the wedge support rail 24 is shown in Figure 17.

[0148] The wedge support rail 24 simplifies both the guidance or driving in of the wedge 20 in the wedge driving direction, so that the wedge 20 can be brought into the clamping position, as well as a movement of the cross bar 21 between the unlocking position and the locking position.

[0149] The crossbar 21 is preferably arranged on an underside of the housing part 22 of the guide device 19. The crossbar 21 can thus be supported on the underside of the housing part 22.

[0150] The crossbar 21 preferably has at least one, in this embodiment two, elongated holes 26, by means of which the crossbar 21 is slidably mounted on the housing part 22. In this embodiment, the crossbar 21 is screwed to the housing part 22. For this purpose, screws 27 are provided in the embodiment.

[0151] In the exemplary embodiment, the elongated holes 26, together with the screws 27, limit a movement of the cross bar 21 transversely to the wedge insertion direction.

[0152] The crossbar 21 can be moved between two end positions transversely to the wedge insertion direction. The crossbar 21 assumes the locking position in the area of ​​a first end position and the unlocking position in the area of ​​a second end position.

[0153] The cross bar 21 has, on its underside facing the wedge 20, a control surface 25 extending at least over a partial length of the cross bar 21, which limits the stroke of the wedge 20 in the guide recesses 23 to different values ​​depending on the position of the cross bar 21.

[0154] As can be seen particularly well in Figures 8 and 9, the control surface 25 has at least a first section 25a which, when the cross bar 21 is brought into contact with the upper side of the wedge contact rail 24 or the upper side of the wedge 20 in the locking position, limits a stroke of the wedge 20 in a direction orthogonal to the toothed section 12 such that the wedge 20 can be brought into engagement with the track teeth 13. The control surface 25 has a second section 25b which, when the cross bar 21 is brought into contact with the upper side of the wedge contact rail 24 or the upper side of the wedge 20 in the unlocking position, enables a greater stroke of the wedge 20.

[0155] In the exemplary embodiment, the control surface 25 further comprises a transition region 25c between the first section 25a and the second section 25b. In the exemplary embodiment, the first section 25a has a gradient such that the stroke becomes smaller, or the wedge contact rail 24 or the wedge 20 is pressed more toward the toothed section 12, the further the crossbar 21 is moved into the locking position.

[0156] The transition section 25c preferably has a greater gradient than the first section 25a. The second section 25b preferably has no gradient.

[0157] In the exemplary embodiment, the wedge 20 is arranged captively in the guide recesses 23. For this purpose, the wedge 20 can have a projection at each of its two ends, which projects beyond the respective associated guide recess 23 in at least one direction.

[0158] In the exemplary embodiment, it is further provided that the wedge support rail 24 is arranged captively in the guide recesses 23. For this purpose, the wedge support rail 24 can have a projection at its respective axial ends, which projects beyond the respective associated guide recess 23 in at least one direction. The projection can preferably be formed by welding or riveting a stop element.

[0159] In the exemplary embodiment, it is provided that the wedge contact rail 24 has a contact surface on the underside, which, together with a contact surface formed on the upper side of the wedge 20, forms a linear guide in order to guide the wedge 20 in the wedge driving direction, wherein the two stop surfaces are preferably designed to be complementary.

[0160] In the exemplary embodiment, the contact surface for the wedge 20 formed on the underside of the wedge contact rail 24, viewed in cross-section, has a recess 28, wherein the recess 28, as shown, is preferably formed as a trapezoidal recess. Alternatively, the recess 28 can also be formed, for example, as a triangular recess, as a recess with rounded edges, as a circular recess, as a rounded recess, or by grooves. Viewed in cross-section, the recess 28 can also have a flat bottom 28a, from which side walls 28b extend towards the wedge 20 and run outwards at an angle of 30° to 60°, preferably 45°, to the bottom (28a). This is shown accordingly in particular in Figures 15 and 16.

[0161] The formation of a trapezoidal recess 28 has proven particularly suitable for guiding the wedge 20. In the exemplary embodiment, the contact surface formed on the upper side of the wedge 20 has side walls that extend complementarily to the side walls 28b of the contact surface of the wedge contact rail 24.

[0162] It has also proven advantageous if the contact surface of the wedge 20, with which the wedge 20 rests against the contact surface of the wedge contact rail 24, in particular if this is designed as a trapezoidal recess 28, has, viewed in cross section, two V-shaped projections 29a, between which there is a V-shaped recess 29b. The two V-shaped projections 29a penetrate into the recess of the contact surface of the wedge contact rail 24. In each case, one side wall of the V-shaped projection borders on one of the side walls 28b of the contact surface of the wedge contact rail 24. This is shown accordingly in an enlarged manner in Figure 15.

[0163] In the exemplary embodiment, the housing part 22 and the cross bar 21 preferably have a U-shaped profile when viewed in cross section.

[0164] Thus, viewed in cross-section, the crossbar 21 is essentially formed from the base of the U-shaped profile and two side walls. In this embodiment, the control surface 25 is formed on the free lower edges of the side walls of the U-shaped profile. The lower edges or the free ends of the side walls of the U-shaped profile are identical. The two lower edges together form the control surface 25.

[0165] The clamping devices 7, 8, the wedge 20, the cross bar 21 and the wedge support rail 24 are made of metal, preferably steel, in the exemplary embodiment.

[0166] Figures 2 to 8 show a representation of the turnbuckle 1 in which the crossbar 21 is in the locking position and the wedge 20 is driven into the clamping position.

[0167] Figures 9 and 10 show a representation of the crossbar 21 in an unlocking position.

[0168] Figure 12 shows a view in which the top of the housing part 22 has been removed, so that the crossbar 21 can be seen from above. In the illustration according to Figure 12, the crossbar 21 is sectioned longitudinally. Figure 12 serves in particular to illustrate the preferred arrangement of the crossbar 21 and also to illustrate the elongated holes 26.

[0169] Figure 13 shows a view according to Figure 12 with a section through the crossbar 21, which runs somewhat deeper, i.e., closer to the cross member 9, than the section according to Figure 12. Thus, the top side (= bottom of the U-shaped profile) of the crossbar 21, in which the elongated holes 26 are located, is not shown in the view in Figure 13. Figure 14 shows a cross section through the second clamping device 8, wherein a wedge support rail 24 is inserted into the guide recess 23 shown.

[0170] As can be seen from Figure 14 and also from Figure 15, the guide recesses 23 preferably have a shoulder 23a on which an underside of the wedge contact rail 24 can rest, so that a movement of the wedge contact rail 24 in the direction of the toothed section 12 is limited.

Claims

P a t e n t a n s p r ü c h e 1. Turnbuckle (1) for clamping frame formwork elements (2), comprising a first clamping device (7) comprising a crossbeam (9) and a first clamping jaw (10), wherein the crossbeam (9) has a toothed section (12) with a series of parallel and parallel guide teeth (13), and comprising a second clamping device (8) comprising a second clamping jaw (14) and a guide device (19), wherein the second clamping device (8) is displaceable in a clamping direction along the crossbeam (9) towards the first clamping jaw (10), and comprising a wedge (20) which is displaceable, guided by the guide device (19), along a wedge-driving direction and can be brought into engagement with at least one of the guide teeth (13) in order to fix the two clamping devices (7, 8) in a clamping position relative to each other, characterized by ,that the guide device (19) has a transverse bar (21) which is displaceable transversely to the wedge insertion direction between an unlocking position and a locking position, wherein the transverse bar (21) is designed and arranged such that in the locking position the transverse bar (21) limits a stroke of the wedge (20) in a direction orthogonal to the toothed section (12) such that the wedge (20) can be brought into engagement with the at least one spur tooth (13) in the clamping position, and wherein in the unlocking position the transverse bar (21) allows a greater stroke of the wedge (20).

2. Turnbuckle according to claim 1, characterized in that the crossbar (21) in the unlocked position allows a stroke of the wedge (20) such that an engagement of the wedge (20) in the guide teeth (13) in the clamping position is at least reduced.

3. Turnbuckle according to claim 1 or 2, characterized in that the crossbar (21) in the unlocking position increases the stroke of the wedge (20) such that the wedge (20) can be brought out of engagement with the track teeth (13) in the clamping position.

4. Turnbuckle according to one of claims 1, 2 or 3, characterized in that the crossbar (21) is displaceable parallel to the clamping direction between an unlocking position and a locking position.

5. Turnbuckle according to one of claims 1 to 4, characterized in that the guide device (19) has a housing part (22) with at least two guide recesses (23) which are arranged at a distance from each other in the wedge driving direction and through which the wedge (20) passes, wherein the guide recesses (23) guide the wedge (20) in the wedge driving direction, and wherein the transverse bar (21) is arranged transversely to the wedge driving direction on the housing part (22).

6. Turnbuckle according to claim 5, characterized in that a wedge guide rail (24) is movably arranged in the guide recesses (23) such that the wedge guide rail (24) can perform a lifting movement orthogonal to the toothed section (12), wherein the wedge guide rail (24) is arranged in the guide recesses (23) on a side of the wedge (20) facing away from the toothed section, such that a bottom side of the wedge guide rail (24) adjoins a top side of the wedge (20) and wherein the crossbar (21) is arranged on the housing part (22) such that the crossbar (21) adjoins a top side of the wedge guide rail (24) facing away from the wedge (20) and the crossbar (21) limits the stroke of the wedge guide rail (24).

7. Turnbuckle according to one of claims 1 to 6, characterized in that the crossbar (21) has on its underside facing the wedge (20) a control surface (25) extending at least over a partial length of the crossbar (21), which limits the stroke of the wedge (20) in the guide recesses (23) to different values ​​depending on the position of the crossbar (21).

8. Turnbuckle according to claim 7, characterized in that the control surface (25) of the crossbolt (21) has at least a first section (25a) which, when the crossbolt (21) is in the locking position in contact with the top of the wedge mounting rail (24) or the top of the wedge (20), limits a stroke of the wedge (20) in a direction orthogonal to the toothed section (12) such that the wedge (20) can be brought into engagement with the track teeth (13) and wherein the control surface (25) has a second section (25b) which, when the crossbolt (21) is in the unlocking position in contact with the top of the wedge mounting rail (24) or the top of the wedge (20), allows a greater stroke of the wedge (20).

9. Turnbuckle according to claim 8, characterized in that the control surface (25) has a transition section (25c) between the first section (25a) and the second section (25b).

10. Turnbuckle according to one of claims 5 to 9, characterized in that the crossbar (21) is arranged on an inside of the housing part (22) of the guide device (19).

11. Turnbuckle according to one of claims 5 to 10, characterized in that the crossbar (21) has at least one, preferably several, in particular two, elongated holes (26) with the aid of which the crossbar (21) is slidably arranged on the housing part (22), preferably screwed in place, and wherein the elongated holes (26) limit a movement of the crossbar (21) transverse to the wedge insertion direction.

12. Turnbuckle according to one of claims 1 to 11 characterized in that the crossbar (21) is displaceable between two end positions transversely to the wedge insertion direction, wherein the crossbar (21) assumes the locking position in the area of ​​a first end position and the unlocking position in the area of ​​a second end position.

13. Turnbuckle according to one of claims 5 to 12, characterized in that the housing part (22) and / or the crossbar (21) have a U-shaped profile in cross-section.

14. Turnbuckle according to one of claims 6 to 13, characterized in that the wedge guide rail (24) has a contact surface on the underside which forms a linear guide with a contact surface formed on the top side of the wedge (20) in order to guide the wedge (20) in the wedge insertion direction, wherein the two stop surfaces are preferably designed to be complementary.

15. Turnbuckle according to claim 14, characterized in that the contact surface for the wedge (20) formed on the underside of the wedge mounting rail (24) has a recess (28) in cross-section, wherein the recess (28) is preferably formed as a trapezoidal recess, as a triangular recess, as a recess with rounded edges, as a circular recess, as a rounded recess or by grooves, and / or in cross-section the recess (28) has a flat bottom (28a) from which side walls (28b) extend towards the wedge (20), which extend outwards at an angle of 30° to 60°, preferably 45°, to the bottom (28a).

16. Turnbuckle according to claim 14 or 15, characterized in that the contact surface formed on the upper side of the wedge (20) has side walls which extend complementarily to the side walls (28b) of the contact surface of the wedge contact rail (24), wherein the contact surface of the wedge (20) preferably has sloping side walls which preferably extend at an angle of 30° to 60°, particularly preferably at an angle of 45°, corresponding to the side walls (28b) of the recess (28) in the wedge contact surface.

17. Turnbuckle according to claim 16, characterized in that the bearing surface of the wedge (20), with which the wedge rests on the bearing surface of the wedge mounting rail (24), has in cross-section two V-shaped projections (29a) between which a V-shaped recess (29b) is located, wherein the two V-shaped projections (29a) penetrate into the recess (28) of the bearing surface of the wedge mounting rail (24) and each side wall of the V-shaped projection (29a) abuts one of the side walls (28a) of the bearing surface of the wedge mounting rail (24).

Images