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] The present application claims priority from German patent application No. 10 2022 107 429.3.

[0002] The invention relates to a turnbuckle for clamping frame formwork elements according to the preamble of claim 1.

[0003] A turnbuckle of this type is known from WO 2005 / 007997 A1, US 2009230283 A1 or WO 2020201858 A1.

[0004] Frame formwork elements are used to construct boundaries for poured objects, especially concrete structures such as building components. To create pourable boundaries, several frame formwork elements must generally be firmly connected or clamped together. Tensioning devices, also known as alignment locks or formwork locks, are used to clamp the frame formwork elements.

[0005] In general, turnbuckles are used to connect adjacent formwork panels flush, aligned, and tightly. Turnbuckles are particularly useful for connecting or tensioning two adjacent formwork panels, and can also be used to connect inside corners, outside corners, hinged corners, and end formwork.

[0006] The turnbuckles can also be used to connect a frame formwork element to an adjacent compensating element. Compensating elements are used to compensate for differences in length and are typically positioned between two conventional frame formwork elements. Compensating elements are usually made of wood, steel, or aluminum. Conventional frame formwork elements have a perimeter frame with at least two vertical and two horizontal frame elements, as well as horizontal bracing to stabilize the frame. The bracing generally runs horizontally between the two vertical frame elements. Additional vertical bracing may also be provided to further stabilize the frame. Compensating elements can have a different design, but they generally also feature a perimeter frame.

[0007] A formwork skin is attached to the frame in a known manner, or can be attached to it.

[0008] Compensating elements also constitute frame formwork elements within the scope of the present invention.

[0009] Turnbuckles are typically installed at the intersections of horizontal bracing and vertical frame elements. Each clamping jaw of the turnbuckle grips a section of a vertical frame element of two formwork panels to be joined. A wedge is then used to clamp the two jaws, and thus the formwork panels, against each other, i.e., the jaws are moved towards one another.

[0010] The turnbuckle typically has a crossbeam and a first clamping jaw, which is usually rigidly connected to the crossbeam. Furthermore, the turnbuckle has a second clamping jaw, which is slidable in a clamping direction along the longitudinal axis of the crossbeam towards the first clamping jaw in order to clamp the frame formwork elements.

[0011] The clamping jaws preferably each have two claws, wherein the two claws of a clamping jaw have a distance from each other such that a horizontally extending strut can be accommodated between the two claws.

[0012] These types of clamping jaws are also called claws.

[0013] 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 tensioning (hereinafter also referred to as the wedge driving direction) or when releasing the wedge, and the tensioning direction, i.e., the movement of the second clamping device along the crossbeam, are at a right angle to each other. If two horizontally adjacent frame formwork elements are connected, i.e., horizontally tensioned, using such a turnbuckle in the usual manner, gravity acts fully on the wedge in such a way that it is pulled in the direction of greater tension. This has proven to be advantageous.

[0014] To clamp the interfaces of two adjacent formwork elements that are subject to particularly high forces, e.g., at hinged corners or external corners, several turnbuckles are used adjacent to each other. The turnbuckles are then typically arranged along a straight line, e.g., one above the other, i.e., vertically offset from each other, with parallel clamping movements of the jaws.

[0015] However, this arrangement can lead to the wedges of the individual turnbuckles interfering with each other. Furthermore, care must be taken to ensure that a sufficient distance is maintained between the wedge ends, which are driven in and out using hammers, and any kind of obstruction, so that operation with a hammer is possible without hindrance.

[0016] Another disadvantage of the previously known turnbuckles is that they generally cannot be mounted on the lowest brace, as there is insufficient 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. Furthermore, after the wedge has been driven in, sufficient space must remain to allow it to be released again by striking it with a hammer in the opposite direction.

[0017] Another important requirement for turnbuckles is that they should be suitable for connecting frame formwork elements with frames of varying thicknesses, for example, depending on whether external corners, hinged corners, or similar features are being joined. For this purpose, it is advantageous if the turnbuckle has a quick-adjustment mechanism, allowing the distance between the two clamping jaws to be quickly and easily set to the desired dimension, the turnbuckle to be attached, and then the frame formwork elements to be clamped. The turnbuckles should therefore have a suitable clamping range that can be adjusted quickly. At the same time, it is also required that they can withstand high forces for short periods, so that when attached to two frame formwork elements, the turnbuckle can reliably fix or clamp them.The aforementioned turnbuckles, which are tightened using a combination of hammer and wedge, have proven suitable for this purpose.

[0018] Tension locks that can be operated without striking tools are also known from the prior art. A known method involves length adjustment via a spindle, but this does not allow for quick adjustment.

[0019] In practice, turnbuckles have become the standard, in which the two clamping jaws, as described above, are moved towards each other and clamped together by means of a wedge driven in by a striking tool. Such turnbuckles have become established because, on the one hand, they ensure a flush, aligned, and tight connection between frame formwork elements, and on the other hand, they allow for quick adjustment to accommodate different spans between the frames of the frame formwork elements to be joined.

[0020] 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 enclose an angle α < 90° in order to improve the operation of the wedge. However, the angle in such turnbuckles is typically α = 90°.

[0021] The present invention is based on the objective of improving the prior art, in particular providing a turnbuckle for clamping frame formwork elements that can be released quickly and easily even in difficult-to-access installation situations.

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

[0023] The turnbuckle according to the invention for clamping frame formwork elements comprises a first clamping device, including a crossbeam and a first clamping jaw. The crossbeam has a toothed section with a series of parallel teeth arranged one behind the other. Furthermore, a second clamping device is provided, comprising a second clamping jaw and a guide device. The second clamping device is displaceable in a clamping direction along the crossbeam towards the first clamping jaw. The turnbuckle also includes a wedge, which, guided by the guide device, is displaceable along a wedge-driving direction and can be brought into engagement with at least one of the teeth to fix the two clamping devices in a clamping position.

[0024] According to the invention, the guide devices have a transverse bar that is displaceable transversely to the wedge insertion direction between an unlocking position and a locking position. The transverse bar is designed and arranged such that, in the locking position, it limits the stroke of the wedge in a direction orthogonal to the toothed section, ensuring that the wedge is engaged with at least one tooth in the clamping position, and that, in the unlocking position, the transverse bar allows a greater stroke of the wedge.

[0025] Because the turnbuckle according to the invention has a transverse bolt, the movement of which between an unlocked position and a locked position influences a stroke that the wedge can execute in a direction orthogonal to the toothed section, the turnbuckle according to the invention can be easily released when it clamps two frame formwork elements together, i.e., when it is in the clamping position, even if the turnbuckle is mounted in a constrained position in which the wedge cannot be released again by hammer blows against the wedge driving direction. Such a constrained position can occur, for example, with frame formwork elements in which the turnbuckle is fixed to a lower horizontal strut or when several turnbuckles are mounted one above the other at close intervals on a straight line.A constrained situation in which the wedge cannot be released by hammer blows against the direction of wedge insertion, or cannot be easily removed by hammer blows against the direction of wedge insertion, can occur particularly with frame formwork elements that form foundation formwork, or with frame formwork elements that have only a small vertical height, for example, frame formwork elements that are used to construct foundations, e.g., railway tracks.

[0026] The tension lock according to the invention is particularly suitable for frame formwork elements used for the production of wall formwork.

[0027] The solution according to the invention makes it possible to release the turnbuckle from the clamping position without having to actuate the wedge. Simple release via the crossbar is possible. This allows the wedge to fall out of the clamping position or be removed without requiring any force.

[0028] Operating the turnbuckle according to the invention, and in particular operating the crossbolt to release the two clamping devices when they are fixed in a clamping position relative to each other, is quick and easy. No additional tool is required to operate the crossbolt. Operation by hand, or optionally with the existing tool, in particular a hammer, is sufficient to move the crossbolt, especially to move it from a locking position to an unlocking position.

[0029] To fix the clamping device in a clamping position, the crossbar can first be moved into the locking position such that it limits the stroke of the wedge in a direction orthogonal to the toothed section, allowing the wedge to engage with at least one, preferably two, 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 direction of insertion. The operation of the turnbuckle, in particular to fix the two clamping devices or the two clamping jaws relative to each other in a clamping position using the wedge, can be carried out in a known manner. To release the clamping devices from the clamping position, the wedge can then be moved in the opposite direction, i.e.,The wedge is released from the toothed section by hammer blows, contrary to the wedge insertion direction. Alternatively, particularly in constrained situations, the clamping device can also be released from the clamping position according to the invention by moving the transverse bolt from its locking position, in which it limits the wedge's stroke in a direction orthogonal to the toothed section such that the wedge is engaged with at least one of the spur teeth in the clamping position, to an unlocking position in which the transverse bolt allows a greater stroke of the wedge. By allowing a greater stroke of the wedge in a direction orthogonal to the toothed section, i.e., by enabling the wedge to move further away from the toothed section in an orthogonal direction, the tooth engagement between the wedge and the respective spur teeth of the toothed section is at least loosened.The wedge can therefore be moved out of the toothed section without the need for hammer blows or significant force.

[0030] The wedge's movement in a direction orthogonal to the gear engagement also occurs orthogonally to the wedge's longitudinal axis or the wedge's direction of impact.

[0031] It is advantageous if the crossbar in the unlocked position allows the wedge to move in such a way that the engagement of the wedge in the track teeth in the clamping position is at least reduced.

[0032] It may be sufficient to release the turnbuckle if the crossbolt, in the unlocked position, at least reduces the engagement of the wedge with the track teeth. This can, for example, allow the wedge to be released without the need for hammer blows.

[0033] It is advantageous if the crossbar in the unlocked 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.

[0034] A design of the crossbar such that, in the unlocked position, the stroke of the wedge is increased to such an extent that the wedge is out of engagement with 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 direction of impact or in the opposite direction to the wedge's impact direction.

[0035] The turnbuckle according to the invention thus makes it possible to release the turnbuckle in a position in which it clamps two frame formwork elements together in two different ways: firstly, by moving the wedge axially against the wedge insertion direction by hammer blows, and secondly, by moving or moving the crossbar from a locking position to an unlocking position.

[0036] 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 by means of an intermediate element or several intermediate elements, for example a wedge mounting rail described in more detail below.

[0037] It is advantageous if the wedge, in the locking position, limits the wedge's stroke in such a way that, when driven into the toothed section in the clamping position, the wedge cannot move at all; that is, the stroke in the clamping position is zero. Moving the crossbar from its locking position to the unlocking position then increases the stroke, i.e., sets a stroke that is greater than the stroke the wedge can take when the crossbar is in the locking position.

[0038] 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 greater than 10% of the tooth depth of the spur teeth. Here, tooth depth is understood to be the distance between the tip of the spur teeth and the valley of the spur teeth, or between the head and the root of a spur tooth. More preferably, the stroke is at least 20%, more preferably at least 30%, and particularly preferably at least 50% of the tooth depth. It can be especially advantageous if the stroke is equal to, and particularly greater than, the tooth depth, so that the teeth of the wedge, which are engaged with at least one of the spur teeth when the wedge is driven into the clamping position, can be completely disengaged from the spur teeth.

[0039] It is advantageous if the stroke that the wedge can assume when the crossbar is in the unlocked position is less than twice the tooth depth, preferably less than 150%, and particularly less than 120% of the tooth depth.

[0040] The stroke of the wedge is understood to be the movement of the wedge orthogonally 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 driven into 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.

[0041] It is advantageous if the crossbar can be moved parallel to the clamping direction between an unlocking position and a locking position.

[0042] A displacement of the crossbar parallel to the bracing direction has proven particularly suitable in order to influence, by moving the crossbar, a stroke that the wedge can perform in a direction orthogonal to the bracing section.

[0043] It is advantageous if the guide device has a housing part with at least two guide recesses, which are arranged at a distance from each other in the direction of wedge insertion and through which the wedge is passed, wherein the guide recesses guide the wedge in the direction of wedge insertion, and wherein the crossbar is arranged transversely to the direction of wedge insertion on the housing part.

[0044] Because the guide device has a housing part with at least two guide recesses through which the wedge passes, the wedge can be moved in a particularly advantageous manner in the direction of wedge insertion, especially into a clamping position or driven in, so that the wedge or the toothing of the wedge engages with one of the guide teeth in such a way that the two clamping devices or the two clamping jaws are fixed relative to each other. It has proven particularly suitable if the crossbar is arranged on the housing part so as to be displaceable transversely to the direction of wedge insertion. Such an arrangement can be implemented with particular stability and reliability. This is especially advantageous for robust applications and with regard to the requirements on construction sites.

[0045] According to the invention, it can be provided that the housing part and / or the crossbar have a U-shaped profile in cross-section.

[0046] It has proven advantageous if the housing part and the crossbar have a cross-sectional profile that is at least approximately U-shaped.

[0047] It can be advantageous if the crossbar is fixed to an inside part of the housing.

[0048] It is further advantageous if the preferably U-shaped crossbar is arranged in the also preferably U-shaped housing part 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 base of the respective U-shaped profile from a front end to a rear end of the crossbar and the housing part, respectively, so that the longitudinal axes run centrally between the side walls of the U-shaped profile at the base.

[0049] The housing part or guide device is preferably formed integrally with the second clamping device. The two side walls of the second clamping jaw are preferably integrally connected to each side wall of the U-shaped profile of the housing part and extend in a direction away from the base of the U-shaped profile of the housing part. Alternatively, 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 connection, for example by welding or bolting.

[0050] It is advantageous if a wedge guide rail is movably arranged in the guide recesses in such a way that the wedge guide rail can perform a stroke movement orthogonal to the toothed section, wherein the wedge guide rail is arranged in the guide recesses on a side of the wedge facing away from the toothed section, such that a bottom of the wedge guide rail adjoins a top of the wedge and wherein the crossbar is arranged on the housing part in such a way that the crossbar adjoins a top of the wedge guide rail facing away from the wedge and the crossbar limits the stroke of the wedge guide rail.

[0051] The use of a wedge guide rail has proven particularly suitable for providing good guidance for the wedge, allowing it to be moved in the direction of wedge insertion—that is, brought into the clamping position and returned from the clamping position by a counter-movement. For this purpose, the wedge guide rail itself is movably arranged in the guide device so that it can perform a stroke movement (orthogonal to the toothed section). The wedge guide rail is positioned in the guide recess such that an underside of the guide rail abuts an upper side of the wedge. Furthermore, the crossbar is positioned against an upper side of the wedge guide rail facing away from the wedge, thus limiting the stroke of the guide rail and, consequently, the stroke of the wedge.The crossbar is thus moved from an unlocked position to a locked position relative to, and in particular in contact with, the wedge guide rail, so that in the locked position the wedge guide rail is moved closer to the gear section. In the unlocked position, the crossbar provides the wedge guide rail with an increased stroke, so that the wedge guide rail can be moved away from the gear section.

[0052] The wedge mounting rail enables the two parts, which are each movable along their longitudinal axis, namely the wedge which moves in the direction of the wedge insertion and the crossbar which is moved perpendicular to the direction of the wedge insertion, not to directly act mechanically on the other part during their respective movements, but rather the movement takes place opposite the wedge mounting rail, which thus functions as an intermediate layer or intermediate element.

[0053] The wedge mounting rail is preferably made in one piece, but can also be made in multiple pieces.

[0054] It is advantageous if the guide recesses have a shoulder against which the wedge guide rail rests when the crossbar is in the locking position. The wedge guide rail rests with its underside against the shoulders of the guide recess. This limits the movement of the wedge guide rail towards the toothed section, preventing it from pressing the wedge too far into the spur teeth or the toothed section.

[0055] 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 limits the stroke of the wedge in the guide recesses to different values ​​depending on the position of the crossbar.

[0056] It has proven particularly advantageous if the crossbar has a control surface extending at least over a portion of its length. The control surface preferably runs along the longitudinal axis of the crossbar or parallel to its displacement, in order to move it between the unlocked and locked positions, i.e., transversely to the wedge insertion direction.

[0057] Preferably, the control surface extends over at least 50% of the length of the crossbar, more preferably over at least 70%, more preferably over at least 80% and more preferably over at least 90% of the length of the crossbar.

[0058] 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 such 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 to a locking position and vice versa.

[0059] Control surfaces can be implemented on the underside of the crossbar using known methods, in particular by selecting a suitable slope. The control surface can act directly on the wedge or via an intermediate element, especially the wedge mounting rail described above.

[0060] The horizontal displacement of the crossbar can be designed such that, in the locked position, a range is provided to compensate for tolerances and wear, for example, up to 10°. This can be achieved in particular by using a control surface that has a corresponding inclination.

[0061] According to the invention, it can be provided that the control surface of the crossbar has at least a first section which, when the crossbar is in the locking position and is in contact with the top of the wedge mounting rail or the top of the wedge, 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 in the unlocking position and is in contact with the top of the wedge mounting rail or the top of the wedge, allows a larger stroke of the wedge.

[0062] The design of the control surface with a first and a second section has proven to be particularly suitable.

[0063] It can be provided that the sections, in particular the first section, have a slope, i.e., that the distance between the first section of the control surface and the toothed section of the cross member changes along the length of the first section. The second section can also have a slope, but is preferably designed without a slope.

[0064] Designing the control surface in the first section with a slope allows for adjustments to accommodate wear of the gear section, the wedge, the wedge guide rail, and / or the crossbar. This ensures that the crossbar is moved further towards the locking position as wear occurs over time. The locking position of the crossbar preferably allows the wedge to be inserted into the gear section in the wedge insertion direction in such a way that there is no further stroke in the locking position. Therefore, it is advantageous if the first section of the control surface of the crossbar is designed to allow for suitable selection of the locking position within this first section.

[0065] 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.

[0066] It has proven advantageous to have a transition section between the two sections of the control surface, which can be characterized in particular by having a steeper pitch than the first section. This allows for a transition between the unlocked and locked positions over a comparatively short distance. This is especially suitable if the first section also has a pitch, so that, despite tolerances and wear, the crossbar can be brought into a position where the wedge engages with at least one of the teeth of the gear section in such a way that no stroke is present in the clamping position.

[0067] The crossbar has a U-shaped profile in cross-section, preferably as described. It is preferably provided that the control surface is formed on the undersides or free ends of the side walls of the U-shaped crossbar. The undersides of the side walls are identical.

[0068] It is advantageous if the crossbar is arranged on an inside side of the housing part of the guide device.

[0069] It has proven particularly suitable if the crossbar is arranged on an inside of the housing part of the guide device, especially if the housing part encompasses the crossbar in a U-shape.

[0070] 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 slidably arranged on the housing part, preferably screwed in place, and wherein the elongated holes limit a movement of the crossbar transverse to the wedge insertion direction.

[0071] It has proven particularly advantageous if the crossbar has one, and especially two, elongated holes, which, with the aid of suitable screws or rivets, allow the crossbar to be slidably mounted on the housing part. The elongated holes can limit the movement of the crossbar perpendicular to the wedge insertion direction. The elongated holes thus extend perpendicular to the wedge insertion direction or run along the longitudinal axis of the crossbar. This also allows the crossbar to be mounted and, if necessary, replaced with particular ease. Furthermore, two elongated holes, in conjunction with suitable fasteners, enable a defined and robust movement of the crossbar perpendicular to the wedge insertion direction, i.e., from the unlocked position to the locked position and vice versa.

[0072] According to the invention, it can further be provided that the wedge and / or the wedge mounting rail are arranged in the guide recesses in a captive manner.

[0073] For ease of handling, it has proven advantageous if the wedge is captive within the guide recesses. For this purpose, the wedge can preferably have angled sections at both ends that prevent it from being completely pulled out of the guide recess. The angled sections are preferably designed such that an inner surface of the angled section comes into contact with the housing part, in particular a housing part surrounding the guide recess, when the wedge is moved to its respective end position.

[0074] The wedge guide rail can be designed similarly to the wedge. Preferably, an additional component is welded to the wedge guide rail, which extends parallel to a surface of the guide recess or a side wall of the housing part and projects beyond the respective guide recess.

[0075] Preferably, the wedge is first inserted into the guide recesses, which, if the wedge guide rail is not yet inserted, provide sufficient space in a direction orthogonal to the gear section to allow the wedge to be inserted. The wedge guide rail is then inserted into the guide recesses. The wedge guide rail can preferably already have a projection at one end, so that a positive fit is achieved with the housing part or an edge of the corresponding guide recess in one direction of movement along the longitudinal axis of the wedge guide rail. At the other end of the wedge guide rail, a projection or end stop can then be attached, preferably after the wedge guide rail has been inserted into the guide recesses, for example by riveting, welding, or bolting.It is also possible to form an end stop by means of deformation, so that the wedge mounting rail, preferably with as little play as possible, is positively engaged in the two guide recesses with respect to movement along its longitudinal axis, or so that movement of the wedge mounting rail along its longitudinal axis is largely prevented.

[0076] It is advantageous if the wedge guide rail has a contact surface on the underside which forms a linear guide with a contact surface formed on the top of the wedge in order to guide the wedge in the direction of wedge insertion, wherein the two stop surfaces are preferably designed to be complementary.

[0077] It has proven particularly suitable if the wedge guide rail and the wedge form a linear guide, so that the wedge is guided in a defined manner in the direction of wedge insertion. The stop surfaces can preferably be designed to be complementary to each other, for example, such that one stop surface has grooves and the other stop surface has interlocking springs. Recesses and / or projections can also be provided on the stop surfaces, designed to form a linear guide.

[0078] According to the invention, it can further be provided that the contact surface for the wedge formed on the underside of the wedge mounting rail has a recess when viewed in cross-section, wherein the recess 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, viewed in cross-section, the recess has a flat bottom from which side walls extend towards the wedge, which extend outwards at an angle of 30° to 60°, preferably 45°, to the bottom.

[0079] It has proven particularly suitable for forming a linear guide for the wedge if the wedge guide rail, viewed in cross-section, has a recess, preferably a trapezoidal recess. The trapezoidal recess is preferably designed such that, extending from the bottom of the recess, side walls run outwards towards the wedge at an angle of 30° to 60°, preferably 45° ± 5°, to the bottom, so that the trapezoidal recess opens outwards towards the wedge. This shape has proven particularly suitable for guiding the wedge compared to a shape in which the side walls are at an angle of 90° to the bottom of the recess. Preferably, the wedge is designed such that it has side walls which abut the side walls of the trapezoidal recess, viewed in cross-section.

[0080] The indentation, in particular the trapezoidal shape or the trapezoidal indentation, especially with a 45° angle, allows the wedge to rest optimally on the contact surface and achieves complete load transfer.

[0081] It is advantageous if the contact surface formed on the upper side of the wedge has side walls that run complementarily to the side walls of the contact surface of the wedge contact rail, wherein the contact surface of the wedge preferably has sloping side walls that preferably run at an angle of 30° to 60°, particularly preferably at an angle of 45°, corresponding to the side walls of the recess in the wedge contact surface.

[0082] This 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 and in the opposite direction for removing the wedge. Furthermore, the inclined side walls allow the forces acting in the lifting direction to be absorbed particularly advantageously.

[0083] 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 mounting rail, has two V-shaped projections in cross-section, 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 mounting rail and each side wall of the V-shaped projection abuts one of the side walls of the contact surface of the wedge mounting rail.

[0084] Such a design of the wedge's contact surface, with which the wedge penetrates the recess of the wedge mounting rail, has proven particularly suitable. Preferably, the two V-shaped projections are identical in cross-section. Furthermore, preferably, the V-shaped recess in the contact surface is located centrally between the two V-shaped projections in cross-section.

[0085] 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 area of ​​a first end position and the unlocking position in the area of ​​a second end position.

[0086] It may be provided that, in particular the locking position, a locking area is included, especially to compensate for tolerances and wear. Preferably, the locking position and the unlocking position are each located at the end or in the end region of the crossbar.

[0087] The crossbar is preferably designed to be captive within the housing part. Movement of the crossbar can be limited by the preferably provided elongated holes. However, it is also possible for the crossbar to have angled sections or projections at its ends, designed such that in the end positions, the crossbar abuts the wedge and / or the wedge mounting rail. The angled sections or projections thus serve as end stops. Preferably, these end stops abut the wedge mounting rail. Furthermore, and more preferably, the end stops limit the movement of the crossbar before the fasteners, in particular the screws, abut the ends of the respective elongated holes. This relieves stress on the screws and / or the elongated holes.

[0088] The figures each show preferred embodiments in which individual features of the present invention are combined with one another. Features of an 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 meaningful combinations and subcombinations with features of other embodiments.

[0089] In the figures, functionally identical elements are provided with the same reference symbols.

[0090] It shows: 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; Figure 3 shows a side view of a turnbuckle according to the invention; Figure 4 shows another perspective view of a turnbuckle according to the invention; Figure 5 shows another perspective view of a turnbuckle according to the invention; Figure 6 shows a perspective front view of a turnbuckle according to the invention; Figure 7 shows a front view of a turnbuckle according to the invention; Figure 8 shows a longitudinal section through a turnbuckle according to the invention, wherein a transverse bolt is in a locking position and the wedge is in the clamping position, so that the wedge engages in the teeth of a toothed section;Figure 9 shows a further longitudinal section through a turnbuckle according to the invention, wherein a crossbolt is in an unlocked position, so that the wedge is out of engagement with the track teeth; Figure 10 shows a perspective view of the longitudinal section; Figure 9 Figure 11 is an exploded view of a turnbuckle according to the invention; Figure 12 is a top view of a turnbuckle according to the invention in a representation showing a horizontal section through a crossbar; Figure 13 is a representation according to Figure 12, wherein the horizontal section runs below a top surface of the crossbar; Figure 14 a longitudinal section through a second clamping device of a turnbuckle according to the invention; Figure 15 an enlarged sectional view of the wedge in the clamping position and of the crossbar in the locking position, wherein a wedge guide rail is positioned between the wedge and the crossbar; and Figure 16 a perspective view of a wedge guide rail.

[0091] The Figure 1 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 plane of the figure is shown. Three turnbuckles 1 are provided by way of example for bracing the middle frame formwork element 2 to the two outer frame formwork elements 2.

[0092] The tension locks 1 according to the invention are generally suitable for connecting or clamping two adjacent formwork elements 2 together, in particular internal corners, external corners, hinged corners and end formwork can be connected using the tension locks 1 according to the invention.

[0093] The turnbuckles 1 according to the invention are also suitable for connecting a frame formwork element 2 with an adjacent compensating element. Such compensating elements also constitute frame formwork elements within the scope of the present invention.

[0094] The frame formwork elements 2 to be joined can preferably be made of wood, plastic, steel, or aluminum. In general, the turnbuckles 1 according to the invention can be used to join adjacent frame formwork elements 2 flush, aligned, and tightly together.

[0095] The turnbuckles 1 according to the invention serve in particular to connect two adjacently positioned frame formwork elements 2, which run in a common plane, as in Figure 1 depicted.

[0096] 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 braces 5 are provided.

[0097] 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 is shown by way of example in the Figure 1is shown.

[0098] The frame formwork elements 2 have a formwork skin in a manner not described in more detail, or can be connected to a formwork skin that faces the material to be poured and hardened.

[0099] The formwork elements 2 are preferably formwork elements for producing bodies to be cast, in particular concrete bodies, especially building components.

[0100] Such frame formwork elements 2 are well known from the prior art, which is why they will not be discussed in more detail below.

[0101] In the exemplary embodiment, frame formwork elements 2 for wall formwork are shown. The present invention is particularly suitable for frame formwork elements 2 used for foundation formwork.

[0102] The frame formwork elements 2 abut each other in a known manner with a boundary surface. The boundary surface is in Figure 1 shown 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.

[0103] In the exemplary embodiment, the boundary line 6 is spanned by three turnbuckles 1, although fewer or more turnbuckles 1 may also be provided.

[0104] The turnbuckles 1 each span a vertically extending frame element 4 of the frame formwork elements 2 to be connected. Furthermore, the turnbuckles 1 are preferably arranged on the horizontally extending struts 5 of the frame formwork elements 2, in particular as shown in Figure 1 is shown.

[0105] The illustrated turnbuckles 1 according to the Figures 2 to 13 show a preferred design so that the turnbuckles 1 can grip the horizontally running struts 5.

[0106] The illustrated turnbuckles 1 have a first clamping device 7 and a second clamping device 8.

[0107] The first clamping device 7 has a crossbeam 9, which is preferably formed in one piece with a first clamping jaw 10.

[0108] The first clamping jaw 10 is rigidly or firmly or immovably connected to the traverse 9.

[0109] The traverse 9 has a preferably flat or planar upper surface 11 with a toothed section 12. The toothed section 12 has several spur teeth 13 arranged one behind the other and running parallel to each other.

[0110] The second clamping device 8 is in a clamping direction (arrow direction A in the Figures 2 and 12 ) along the traverse 9 in the direction of the first clamping jaw 10 (and in the opposite direction) can be moved.

[0111] If the two clamping devices 7, 8 are not clamped to each other by a wedge 20, which will be shown in more detail below, the second clamping device 8 can be moved quickly and easily along the crossbeam 9 without significant effort in order to adjust the turnbuckle 1 to the two frame formwork elements 2 to be joined together. This is also referred to as quick adjustment.

[0112] In the exemplary embodiment, the traverse 9 is preferably a tubular element, preferably with a substantially rectangular, in particular square, cross-section.

[0113] In the exemplary embodiment, the upper surface 11 and the toothed section 12 with the spur teeth 13 are preferably formed in one piece with the traverse 9.

[0114] The second clamping device 8 of the turnbuckle 1 has a second clamping jaw 14.

[0115] The first clamping jaw 10 and, similarly, 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.

[0116] The second clamping jaw 14 or the second clamping device 8 is displaceable in the clamping direction along the longitudinal axis of the traverse 9 towards the first clamping jaw 10 (and in the opposite direction).

[0117] In the exemplary embodiment, it is provided that the second clamping device 8 is connected to the traverse 9 of the first clamping device 7 in a way that prevents loss, or is arranged on the traverse 9 in a way that prevents loss.

[0118] For this purpose, it can be provided that movement of the second clamping device 8 in and / or against the clamping direction is limited by projections 15 and / or limit stops 18. The projections 15 and / or the limit stops 18 are preferably arranged such that the second clamping device 8 cannot be pulled off the crossbeam 9 in and / or against the clamping direction.

[0119] In the exemplary embodiment, it is preferably provided that the crossbeam 9 has projections 15 at its two axial ends 9a, 9b. These projections can preferably be projections (as shown). However, the projections 15 can also be formed by any stop elements, e.g., pins, bolts, or edges. The projections 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 crossbeam 9 in and / or against the clamping direction. In the exemplary embodiment, the projections 15 interact with limit stops 18 which are formed on the second clamping device 8, preferably by pins or bolts.

[0120] In the exemplary embodiment, a locking mechanism is shown using projections 15 and limit stops 18, which form a positive locking device in and against the clamping direction. Preferably, one of the limit stops 18 interacts with one of the projections 15. Preferably, one, and more preferably, two projections 15 are provided at a first axial end 9a of the crossbeam 9, which interact with one, and preferably, two limit stops 18 of the second clamping device 8. Preferably, one, and more preferably, two projections 15 are provided at the second end 9b of the crossbeam 9, which interact with one, and preferably, two limit stops 18 of the second clamping device 8.

[0121] It can also be provided that the shapes 15 and the limit stops 18 only limit movement against the direction of tension.

[0122] A loss-prevention device 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., obstructing each other in the clamping direction, when the second clamping device 8 is moved to an endpoint in the clamping direction A.

[0123] To displace the second clamping device 8 in and against the clamping direction along the longitudinal axis of the traverse 9, the traverse 9 and the second clamping device 8 preferably form a guide rail or rail guide in the exemplary embodiment. This guide rail is designed such that the second clamping device 8 is guided and movable along the longitudinal axis of the traverse 9 in and against the clamping direction. The upper surface 11 of the traverse 9, in particular the longitudinal edges of the upper surface 11, which preferably project beyond a first or a second longitudinal side 16, 17 of the traverse 9, can form part of the rail guide. The inner surface of the second clamping device 8 facing the longitudinal edges of the upper surface 11 can be designed to complement the rail guide accordingly. In the exemplary embodiment, the limit stops 18 engage the longitudinal edges of the traverse 9.The limit stops 18 thus form part of the rail guide. The limit stops 18 also prevent the second clamping device 8 from being lifted off the crossbeam 9. A specific design of the inner surface of the second clamping device 8, such that it is complementary to the longitudinal edges of the upper surface 11 of the crossbeam 9, is therefore not necessary in the exemplary embodiment, or rather, it is achieved by the limit stops 18.

[0124] 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-driving 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 each other.

[0125] The wedge driving direction is in Figure 2 and Figure 12labelled with arrow B.

[0126] In the exemplary embodiment, it is preferably provided that the wedge 20 engages in two spur teeth 13 of the toothed section 12 in the clamping position.

[0127] In the exemplary embodiment, the wedge insertion direction is orthogonal to the clamping direction. Preferably, the wedge insertion direction and the clamping direction lie in a plane that is parallel to the top surface 11 of the crossbeam 9.

[0128] To clamp the two clamping devices 7, 8 in a clamping position relative to each other using the wedge 20, the guide teeth 13 are arranged at an angle to the wedge insertion direction on the upper surface 11 of the crossbeam 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 shown in the Figures 12 and 13This is clearly recognizable and generally known. This ensures that the track 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 in the track teeth 13.

[0129] The guide device 19 has a transverse angle to the wedge driving direction between a release position (as seen in Figure 9 and 10 ) and a locking position (as seen in Figure 8 ) sliding crossbar 21 on.

[0130] The crossbar 21 is designed and arranged such that, in the locking position, it limits the stroke of the wedge 20 in a direction orthogonal to the toothed section 12, such that the wedge 20 is engaged with the at least one spur tooth 13 in the clamping position. This is illustrated, among other things, in the Figure 8 and enlarged in Figure 15In the exemplary embodiment, the wedge 20 is present, as shown in Figure 15 shown, in engagement with two spur teeth 13.

[0131] The crossbar 21 is designed such that in the unlocked position the crossbar 21 allows a greater stroke of the wedge 20.

[0132] In the exemplary embodiments, it is provided that the crossbar 21 in the unlocked position allows a stroke of the wedge 20 such that the engagement of the wedge 20 in the track teeth 13 in the clamping position can at least be reduced.

[0133] In the unlocked position, the crossbar 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.

[0134] In the exemplary embodiments, it is shown that the wedge 20 has teeth on its underside. In cross-section, preferably two projecting teeth 20a are provided, each preferably extending 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 recess 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 bear against the tooth flanks of the track teeth 13 when the wedge 20 is driven into the clamping position. For this, reference is made to the illustration according to the Figure 15 referred.

[0135] 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 crossbolt 21 is moved from the locking position, in which the crossbolt 21 is located when the wedge 20 is driven into the toothed section 12 along the wedge insertion direction, into the unlocking position.

[0136] As described, in the unlocked position, the crossbar 21 increases the stroke of the wedge 20 such that the wedge 20 can be disengaged from the track teeth 13 without having to move the wedge 20 against the direction of wedge insertion.

[0137] The wedge 20 can thus be raised orthogonally to the gear section to such an extent that the teeth 20a on the underside of the wedge 20 and the track teeth 13 no longer mesh with each other, i.e., their tooth flanks no longer touch. This is in Figure 9 and 10As shown, the two clamping devices 7 and 8 can thus be moved against the clamping direction, and the turnbuckle 1 can therefore be removed from the frame formwork elements 2 without having to move the wedge 20. After the engagement of the wedge 20 with the guide teeth 13 is reduced in the unlocked position, or preferably the wedge is completely disengaged from the guide teeth 13, the wedge 20 can be moved against the wedge insertion direction without significant force, if necessary even by hand, in order to retract the wedge 20.

[0138] 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 each other in the direction of wedge insertion. In the exemplary embodiment, the guide recesses 23 represent windows in the side surfaces of the housing part 22, the side surfaces preferably being parallel to each other. The wedge 20 passes through the guide recesses 23. The guide recesses 23 guide the wedge 20 in the direction of wedge insertion.

[0139] The crossbar 21 is arranged transversely to the wedge insertion direction on the housing part 22.

[0140] As from the Figures 2 to 15As can be seen, a wedge guide rail 24 is movably arranged in the guide recesses 23 such that it can perform a stroke movement orthogonal to the toothed section 12. The wedge guide rail 24 is positioned on the side of the wedge 20 facing away from the toothed section 12 in the guide recesses 23 such that an underside of the wedge guide rail 24 abuts an upper side of the wedge 20. The crossbar 21 is arranged on the housing part 22 such that it abuts an upper side of the wedge guide rail 24 facing away from the wedge 20 and limits the stroke of the wedge guide rail 24. The wedge guide rail 24 is thus located between the crossbar 21 and the wedge 20.

[0141] A perspective view of an advantageous embodiment of the wedge mounting rail 24 is shown in Figure 17.

[0142] The wedge guide rail 24 simplifies both the guiding 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 crossbar 21 between the unlocking position and the locking position.

[0143] The crossbar 21 is preferably arranged on the 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.

[0144] The crossbar 21 preferably has at least one, and in the exemplary embodiment two, elongated holes 26, by means of which the crossbar 21 is slidably arranged on the housing part 22. In the exemplary embodiment, the crossbar 21 is screwed to the housing part 22. For this purpose, screws 27 are provided in the exemplary embodiment.

[0145] In the exemplary embodiment, the elongated holes 26 together with the screws 27 limit a movement of the crossbar 21 transverse to the wedge insertion direction.

[0146] The crossbar 21 is movable between two end positions transversely to the wedge driving direction. In the region of a first end position, the crossbar 21 assumes the locking position, and in the region of a second end position, it assumes the unlocking position.

[0147] 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.

[0148] How to best use the Figures 8 and 9As can be seen, the control surface 25 has at least a first section 25a which, when the crossbar 21 is in the locking position and in contact with the upper surface of the wedge contact rail 24 or the upper surface of the wedge 20, limits the stroke of the wedge 20 in a direction orthogonal to the toothing section 12 such that the wedge 20 can be brought into engagement with the spur teeth 13. The control surface 25 has a second section 25b which, when the crossbar 21 is in the unlocking position and in contact with the upper surface of the wedge contact rail 24 or the upper surface of the wedge 20, allows a greater stroke of the wedge 20.

[0149] In the exemplary embodiment, the control surface 25 further has a transition area 25c between the first section 25a and the second section 25b.

[0150] In the exemplary embodiment, the first section 25a has a slope such that the stroke becomes smaller or the wedge mounting rail 24 or the wedge 20 is pressed more towards the toothed section 12 as the crossbar 21 is moved further into the locking position.

[0151] The transition section 25c preferably has a steeper slope than the first section 25a. The second section 25b preferably has no slope.

[0152] In the exemplary embodiment, the wedge 20 is provided to be captive in the guide recesses 23. For this purpose, the wedge 20 may be provided to have a projection at each of its two ends, which extends beyond the respective guide recess 23 in at least one direction.

[0153] In the exemplary embodiment, it is further provided that the wedge mounting rail 24 is captive in the guide recesses 23. For this purpose, the wedge mounting rail 24 may have a projection at its respective axial ends, which extends beyond the respective guide recess 23 in at least one direction. Preferably, the projection can be formed by welding or riveting a stop element.

[0154] In the exemplary embodiment, the wedge guide rail 24 has a contact surface on its 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 direction of wedge insertion, wherein the two stop surfaces are preferably designed to be complementary.

[0155] In the exemplary embodiment, 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 shown. 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. In cross-section, the recess 28 can also have a flat bottom 28a, from which side walls 28b extend towards the wedge 20, extending outwards at an angle of 30° to 60°, preferably 45°, to the bottom (28a). This is particularly advantageous in the Figure 15 and 16 as shown.

[0156] The formation of a trapezoidal recess 28 has proven to be particularly suitable for guiding the wedge 20.

[0157] In the exemplary embodiment, it is provided that the contact surface formed on the upper side of the wedge 20 has side walls which run complementarily to the side walls 28b of the contact surface of the wedge contact rail 24.

[0158] It has also proven advantageous if the bearing surface of the wedge 20, with which the wedge 20 bears against the bearing surface of the wedge mounting rail 24, particularly if this is designed as a trapezoidal recess 28, has, in cross-section, two V-shaped projections 29a, between which a V-shaped recess 29b is located. The two V-shaped projections 29a penetrate into the recess of the bearing surface of the wedge mounting rail 24. Each side wall of the V-shaped projection abuts one of the side walls 28b of the bearing surface of the wedge mounting rail 24. This is enlarged in the Figure 15 as shown.

[0159] In the exemplary embodiment, the housing part 22 and the crossbar 21 preferably have a U-shaped profile when viewed in cross-section.

[0160] The crossbar 21, viewed in cross-section, is thus essentially formed from the base of the U-shaped profile and two side walls. In the exemplary 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.

[0161] In the exemplary embodiment, the clamping devices 7, 8, the wedge 20, the crossbar 21 and the wedge mounting rail 24 are made of metal, preferably steel.

[0162] The Figures 2 to 8show 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.

[0163] The Figure 9 and 10 show a representation of the crossbar 21 in an unlocked position.

[0164] The Figure 12 Figure 1 shows a representation in which the top of the housing part 22 has been removed, so that the crossbar 21 is visible from above. In the illustration according to... Figure 12 The crossbar 21 is cut longitudinally. Figure 12 This serves in particular to clarify the preferably intended arrangement of the crossbar 21 and also to illustrate the elongated holes 26.

[0165] Figure 13 shows a representation according to Figure 12 with a cut through the crossbeam 21, which runs slightly lower, i.e. closer to the traverse 9, than the cut after Figure 12 In the presentation of the Figure 13The top side (= bottom of the U-shaped profile) of the crossbar 21, in which the elongated holes 26 are located, is therefore not shown.

[0166] The Figure 14 shows a cross-section through the second clamping device 8, in which a wedge mounting rail 24 is inserted into the guide recess 23 shown.

[0167] As from Figure 14 and also from Figure 15 As can be seen, the guide recesses 23 preferably have a shoulder 23a on which a lower side of the wedge mounting rail 24 can rest, so that movement of the wedge mounting rail 24 in the direction of the toothed section 12 is limited.

Claims

1. A turnbuckle (1) for bracing frame formwork elements (2), comprising a first clamping device (7) having a crossmember (9) and a first clamping jaw (10), the crossmember (9) having a toothed portion (12) with a row of track teeth (13) arranged one behind the other and running in parallel with one another, and comprising a second clamping device (8) having a second clamping jaw (14) and a guide device (19), the second clamping device (8) being movable in a clamping direction along the crossmember (9) toward the first clamping jaw (10), and having a wedge (20) which, guided by the guide device (19), is movable along a wedge-driving 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) with respect to one another in a bracing position, wherein the guide device (19) has a cross brace (21) which can move transversely to the wedge-driving direction between an unlocking position and a locking position, characterized in that the cross brace (21) being designed and arranged such that in the locking position, the cross brace (21) limits a stroke of the wedge (20) in a direction orthogonal to the toothed portion (12) such that in the bracing position, the wedge (20) can be brought into engagement with the at least one track tooth (13), and the cross brace (21) enabling a greater stroke of the wedge (20) in the unlocking position.

2. The turnbuckle according to claim 1, characterized in that in the unlocking position, the cross brace (21) enables a stroke of the wedge (20) such that engagement of the wedge (20) in the track teeth (13) is at least reduced in the bracing position.

3. The turnbuckle according to either claim 1 or claim 2, characterized in that in the unlocking position, the cross brace (21) increases the stroke of the wedge (20) such that the wedge (20) can be disengaged from the track teeth (13) in the bracing position.

4. The turnbuckle according to either claim 1, claim 2 or claim 3, characterized in that the cross brace (21) can be moved in parallel with the clamping direction between an unlocking position and a locking position.

5. The turnbuckle according to any 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 one another in the wedge-driving direction and through which the wedge (20) is passed, the guide recesses (23) guiding the wedge (20) in the wedge-driving direction, and the cross brace (21) being movably arranged on the housing part (22) transversely to the wedge-driving direction.

6. The turnbuckle according to claim 5, characterized in that a wedge contact rail (24) is movably arranged in the guide recesses (23) such that the wedge contact rail (24) can carry out a lifting movement orthogonally to the toothed region (12), the wedge contact rail (24) being arranged in the guide recesses (23) on a side of the wedge (20) facing away from the toothed portion such that a lower side of the wedge contact rail (24) adjoins an upper side of the wedge (20), and the cross brace (21) being arranged on the housing part (22) such that the cross brace (21) adjoins an upper side of the wedge contact rail (24) facing away from the wedge (20), and the cross brace (21) limits the stroke of the wedge contact rail (24).

7. The turnbuckle according to any one of claims 1 to 6, characterized in that the cross brace (21) has, on its lower side facing the wedge (20), a control surface (25) extending over at least some of the length of the cross brace (21) that limits the stroke of the wedge (20) in the guide recesses (23) to different values depending on the position of the cross brace (21).

8. The turnbuckle according to claim 7, characterized in that the control surface (25) of the cross brace (21) has at least a first portion (25a) which, when the cross brace (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 portion (12) such that the wedge (20) can be brought into engagement with the track teeth (13), and the control surface (25) having a second portion (25b) which, when the cross brace (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).

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

10. The turnbuckle according to any one of claims 5 to 9, characterized in that the cross brace (21) is arranged on an inner side of the housing part (22) of the guide device (19).

11. The turnbuckle according to any one of claims 5 to 10, characterized in that the cross brace (21) has at least one, preferably a plurality of, in particular two, slots (26), by means of which the cross brace (21) is movably arranged on the housing part (22), preferably screwed, and the slots (26) limiting a movement of the cross brace (21) transversely to the wedge-driving direction.

12. The turnbuckle according to any one of claims 1 to 11, characterized in that the cross brace (21) can move between two end positions transversely to the wedge-driving direction, the cross brace (21) assuming the locking position in the region of a first end position and the unlocking position in the region of a second end position.

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

14. The turnbuckle according to any one of claims 6 to 13, characterized in that the wedge contact rail (24) has a contact surface on the lower side which forms a linear guide with a contact surface formed on the upper side of the wedge (20) in order to guide the wedge (20) in the wedge-driving direction, the two stop surfaces preferably being complementary.

15. The turnbuckle according to claim 14, characterized in that the contact surface for the wedge (20) formed on the lower side of the wedge contact rail (24) has a depression (28) viewed in cross section, the depression (28) preferably being formed as a trapezoidal depression, as a triangular depression, as a depression having rounded edges, as a circular depression, as a rounded depression or by grooves, and / or, viewed in cross section, the depression (28) has a flat bottom (28a) from which side walls (28b) extend in the direction of the wedge (20), which run outward at an angle of 30° to 60°, preferably 45°, to the bottom (28a).

Images