WO2022128798A1

WO2022128798A1 - Turnbuckle for bracing frame formwork elements, and device for erecting boundaries for bodies to be poured

Info

Publication number: WO2022128798A1
Application number: PCT/EP2021/085234
Authority: WO
Inventors: Wilfried Haeberle
Original assignee: Peri Se
Priority date: 2020-12-15
Filing date: 2021-12-10
Publication date: 2022-06-23
Also published as: DE102020133598A1

Abstract

The invention relates to a turnbuckle (1) for bracing frame formwork elements (2), comprising a first clamping device (6) which has a cross bar (8) and a first clamping jaw (9). The turnbuckle (1) also comprises a second clamping device (7) which has a second clamping jaw (14). The second clamping device (7) can be moved in a bracing direction along the longitudinal axis of the cross bar (8) towards the first clamping jaw (9). A tensioning device (26) is provided, comprising a ratchet mechanism (27) for moving and for bracing the second clamping device (7) in the bracing direction along the longitudinal axis of the cross bar (8) towards the first clamping jaw (9).

Description

Turnbuckle for bracing frame formwork elements and device for erecting boundaries for bodies to be cast

The present application claims the priority of German Patent Application No. 10 2020 133 598.9, the content of which is incorporated herein by reference in its entirety.

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

The invention also relates to a device for erecting boundaries for bodies to be cast, in particular concrete bodies, having a plurality of panel formwork elements.

A generic turnbuckle is known from WO 2005/007997 A1.

Panel formwork elements are used to erect boundaries for bodies to be cast, in particular concrete bodies, such as parts of buildings. In order to obtain borders that can be poured out, several panel formwork elements usually have to be firmly connected or clamped together. Turnbuckles, which are also referred to as alignment locks, are used to brace the panel formwork elements.

In general, turnbuckles are used to connect adjacent panel formwork elements flush, flush and tightly to one another. Turnbuckles are used in particular to connect or brace two adjacent frame formwork elements to one another, with inner corners, outer corners, articulated corners and end formwork in particular also being able to be connected using the turnbuckles.

The turnbuckles can also be used to connect a panel formwork element to an adjacent compensation element. Compensation elements are used to achieve length compensation and are typically arranged between two conventional panel formwork elements. The compensating elements are mostly made of wood, steel or aluminum.

Conventional frame formwork elements generally have a formwork skin, a preferably peripheral frame with at least vertically running frame elements and horizontally running struts for stabilizing the frame. The braces generally run horizontally between two vertical frame members of the frame. In addition, vertical struts can also be provided in order to additionally stabilize the frame. Compensating elements can have a different structure, but as a rule a peripheral frame is also provided. In the context of the present invention, compensation elements also represent panel formwork elements.

As a rule, turnbuckles are arranged in the area of the intersections of horizontally running struts and vertically running frame elements of the frame. In each case one clamping jaw of the turnbuckle encompasses a section of a vertically running frame element of two frame formwork elements to be connected. The two clamping jaws and thus the panel formwork elements are then clamped against each other by means of a wedge, i. H. the clamping jaws are moved towards each other.

The turnbuckle generally has a traverse and a first clamping jaw, which is typically immovably connected to the traverse. Furthermore, the turnbuckle has a second clamping jaw, the second clamping jaw being displaceable in a clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw in order to clamp the panel formwork elements.

The clamping jaws preferably each have two claws, the two claws of a clamping jaw being at a distance from one another in such a way that a horizontal brace can be accommodated between the two claws.

Such clamping jaws are also referred to as claws.

In the case of the turnbuckles known from the prior art, it is usually provided that the direction of translation of the wedge when it is being driven into the turnbuckle during clamping and the clamping direction 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. H. braced horizontally, gravity acts fully on the wedge in such a way that it is pulled towards greater tension.

To interfaces of two adjacent panel formwork elements that experience particularly large forces such. B. in articulated corners or outside corners, several turnbuckles are used adjacent. The turnbuckles are then typically on a straight line, z. B. among themselves, d. H. vertically offset from each other, arranged with parallel clamping movements of the clamping jaws.

However, this arrangement can cause the problem that the wedges of the individual turnbuckles interfere with each other. Furthermore, care must be taken to ensure that the wedge ends, which are driven in and loosened using hammers, are kept at a sufficient distance from any type of obstacle so that operation using a hammer is possible without impairment. An important requirement for turnbuckles is that they should be suitable for connecting panel formwork elements whose frames have different strengths, for example depending on whether external corners, articulated corners or the like are to be connected. For this purpose, it is advantageous if the turnbuckle has a quick adjustment mechanism, so that the distance between the two clamping jaws of the turnbuckle can be quickly and easily set to the desired size, the turnbuckle can be attached and then the panel formwork elements can be tightened. The turnbuckles should therefore have a suitable span, which should be able to be set quickly. At the same time, however, it is also required that high forces can be applied in the short term so that the turnbuckle, when attached to two panel formwork elements, can reliably fix or brace them. The aforementioned turnbuckles, which are tightened with a combination of hammer and wedge, have proven to be suitable for this.

However, the use of hammers to drive in and loosen the wedges leads to noise pollution on the construction site, which should be avoided as far as possible.

Another disadvantage of the aforementioned turnbuckles is that they generally cannot be mounted on the lowest strut because there is not enough space there. The wedge requires space below the truss into which the wedge is to be driven, so that the wedge can protrude below the truss. Furthermore, there must be enough space to be able to loosen the wedge again by hitting it with a hammer in the opposite direction.

Also turnbuckles are known from the prior art, which can be operated without hitting tools. A length adjustment via a spindle is known, but this does not allow quick adjustment.

The turnbuckles known from the prior art are predominantly complex to handle or have bulky, bulky constructions.

In practice, turnbuckles have prevailed in which the two clamping jaws, as described above, can be moved towards one another and braced with one another by means of 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 frame formwork elements, and on the other hand such turnbuckles allow quick adjustment in order to adjust the turnbuckles to different spans between the frames of the frame formwork elements to be connected.

Such a turnbuckle is disclosed in the generic document.

The object of the present invention is to improve the prior art, in particular to provide a turnbuckle for clamping panel formwork elements. in which the two clamping jaws can be moved towards one another quickly and easily and braced against one another, so that a tight connection can be produced between two panel formwork elements to be braced.

This object is solved by the features of claim 1.

The present invention is also based on the object of creating a device for erecting boundaries for bodies to be cast, in particular concrete bodies, having a plurality of frame formwork elements, in which at least two adjacent frame formwork elements can be braced or tightly connected to one another simply and quickly .

This object is achieved by claim 14 according to the invention.

The turnbuckle according to the invention according to claim 1 for clamping frame formwork elements has a first clamping device, having a traverse and a first clamping jaw. Furthermore, the turnbuckle according to the invention has a second clamping device, having a second clamping jaw. The second clamping device can be displaced in a bracing direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

According to the invention, a clamping device with a ratchet mechanism is provided in order to displace and clamp the second clamping device in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

The turnbuckle according to the invention has an easy-to-use and robust structure with two clamping devices, the first clamping device being designed in a known manner with a crossbar and a first clamping jaw, and the second clamping device, which has a second clamping jaw, along the longitudinal axis of the crossbar in Direction is displaceable on the first jaw. This design has basically proven itself in practice, in particular since this type of movement allows a quick adjustment to be implemented in a simple manner. This means that the span or the distance between the two clamping jaws of the turnbuckle can be set quickly and easily to the distance that is required to clamp two panel formwork elements. Such a structure is known in principle from the prior art.

The design of a turnbuckle for clamping frame formwork elements with a clamping device with a ratchet mechanism makes it possible to operate the turnbuckle without the use of a hammer and a wedge being necessary. Operation is easy for the operator, especially since the functional principle of a ratchet mechanism is fundamentally known, which makes it easier to operate the turnbuckle. A stepless adjustment can be achieved in a simple manner with the turnbuckle according to the invention.

According to the invention, it can also be provided that the second clamping device is captively arranged on the traverse or is captively connected to the traverse.

It has turned out to be particularly suitable for handling on the construction site if the second clamping device is arranged captively on the traverse or is captively connected to the first clamping device.

It is advantageous if a movement of the second clamping device counter to the bracing direction is limited by protrusions and/or limit stops, the protrusions and/or the limit stops being arranged in such a way that the second clamping device cannot be pulled off the traverse counter to the bracing direction.

It is advantageous if the formations and/or the limit stops are formed on the traverse, preferably in the area of a second end of the traverse facing away from the first clamping jaw, and the formations and/or the limit stops with correspondingly complementary elements on the second clamping device in such a way Cooperation that the second clamping device cannot be removed from the traverse counter to the bracing direction.

Furthermore, it is advantageous if a loss prevention device in the bracing direction is realized in that the first clamping jaw and the second clamping jaw are arranged in such a way that the clamping jaws limit a movement of the second clamping device in such a way that the second clamping device cannot be pulled off the traverse in the bracing direction .

A captive design or a captive device in the bracing direction of the second clamping device can be implemented in a simple manner in that the first clamping jaw stands in the way of the second clamping jaw at an end point of the movement of the second clamping device in the bracing direction.

In a direction opposite to the bracing direction, an anti-loss device can preferably be implemented in that the traverse has a formation, preferably a projection, for example in that a projection is formed or introduced in some other way in the area of the second end of the traverse facing away from the first clamping jaw.

The overhang can also be a projection, for example. It is also possible for the second clamping device and/or the traverse to have a pin or generally a stop element, so that the second clamping device is prevented from being pulled off the traverse in a form-fitting manner in the opposite direction to the bracing direction.

It is advantageous if a span of a distance between the first clamping jaw and the second clamping jaw is 0 mm to 400 mm, preferably 0 mm to 350 mm, more preferably 0 mm to 300 mm, in particular 0 mm to 250 mm.

It can also be provided that the lower value of the distance in the aforementioned examples is not 0 mm, but 80 mm, preferably 100 mm. This is because it is generally not necessary to push them together in such a way that the clamping jaws touch.

The aforementioned values for the span between the first clamping jaw and the second clamping jaw mean that the turnbuckle can be constructed in a cost-effective and robust manner. The turnbuckle can also be quickly and easily adjusted to the desired size. It has been shown that the aforementioned spans are sufficient to connect the common panel formwork elements to one another.

It is advantageous if a guide is provided which is designed in such a way that the second clamping device can be moved in a guided manner along the longitudinal axis of the traverse in the bracing direction and counter to the bracing direction.

It has been found to be particularly suitable if the traverse and the second clamping device are designed in such a way that the second clamping device can be moved linearly on the traverse along the longitudinal axis of the traverse in the bracing direction and counter to the bracing direction. For this purpose, the traverse and the clamping device preferably form a rail guide together, or the guide is designed as a rail guide.

When clamping two frame formwork elements, the turnbuckles used clamp a typically straight boundary line between the frame formwork elements. The turnbuckles are preferably arranged one below the other or one above the other on a straight line that runs parallel to this boundary line, with the bracing movements of the clamping jaws of the turnbuckles running parallel to one another.

The first clamping device and the second clamping device, in particular the clamping jaws and the traverse, are preferably forged parts. The clamping jaws and the traverse are preferably made of steel. The traverse is preferably a rolled tube. According to the invention it can be provided that the ratchet mechanism has at least one ratchet wheel and at least one releasable pawl in order to prevent the ratchet wheel from rotating backwards.

Such a ratchet mechanism is already known from the prior art, but not for a turnbuckle for bracing panel formwork elements.

It has been found to be particularly advantageous if the ratchet mechanism is constructed in such a way that it has at least one ratchet wheel, preferably two ratchet wheels, and a releasable pawl which interacts with the ratchet wheel or wheels in order to prevent the ratchet wheel or ratchet wheels from rotating backwards impede.

It is advantageous if the ratchet mechanism is fixed to the second clamping device.

Such an arrangement has proven to be particularly suitable for displacing and clamping the second clamping device in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

According to the invention, it can be provided that the clamping device has a handle in order to set the ratchet wheel or ratchet wheels in rotation and to move and clamp the second clamping device in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

The ratchet mechanism can be operated, preferably with a handle, to rotate the ratchet wheel or ratchet wheels and thus to move and clamp the second clamping device in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

A spring element can be provided which keeps the pawl in engagement with the ratchet wheel or wheels. It is advantageous if the pawl can be moved against the force of the spring element in order to release the pawl when the turnbuckle is to be released again or when the second clamping device is to be moved counter to the bracing direction along the longitudinal axis of the traverse.

According to the invention, it can be provided that the tensioning device has a webbing, with a first end of the webbing being fixed to the first clamping device, preferably to the traverse.

Such an arrangement has proven to be particularly suitable for displacing and clamping the second clamping device in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw. It is advantageous if the webbing is fixed in the region of a first end of the traverse facing the first clamping jaw.

By fixing the webbing in this way, it can be achieved in a simple manner that the second clamping device is moved in the direction of the first clamping jaw when the ratchet mechanism is operated in a known manner.

It is advantageous if a fastening element, preferably a bolt, is fixed to the traverse, preferably in such a way that the fastening element extends orthogonally between two longitudinal sides of the traverse, the first end of the webbing being fixed to the fastening element.

It has turned out to be particularly suitable if the first end of the webbing is fixed to a fastening element, preferably a bolt, which preferably extends orthogonally between two longitudinal sides of the traverse. The webbing can thus be fixed particularly easily and stably. Furthermore, the second clamping device can be shifted and clamped particularly reliably in the clamping direction along the longitudinal axis of the traverse in the direction of the first clamping jaw.

According to the invention, it can also be provided that a second end of the webbing is fixed to a winding drum, the winding drum being mechanically connected to the ratchet wheel or ratchet wheels in such a way that rotation of the ratchet wheel or ratchet wheels caused by the handle results in rotation of the Winding drum leads in such a way that the webbing is wound onto the winding drum.

It has proven to be particularly advantageous if the second end of the webbing is fixed to a winding drum or generally to a drum or a roller. The winding drum is preferably mechanically connected to the ratchet wheel or ratchet wheels in such a way that rotation of the ratchet wheel or ratchet wheels caused by the handle causes the winding drum to rotate such that the webbing is wound onto the winding drum. The winding of the webbing onto the winding drum results in the second clamping device being displaced along the longitudinal axis of the traverse in the direction of the first clamping jaw, since the first end of the webbing is fixed there, preferably in the area of the first end of the traverse.

As soon as the second clamping device or the second clamping jaw formed on the second clamping device comes into contact with a panel formwork element, if the first clamping jaw is already in contact with a panel formwork element, a further movement of the handle or a further winding of the webbing onto the winding drum , the turnbuckle tightened. If the second clamping device or the second clamping jaw is braced with the first clamping device or the first clamping jaw, the to be connected to each other Panel formwork elements on which the turnbuckle engages are braced together accordingly or lie tightly against one another.

A backward movement of the second clamping device or the ratchet wheel is prevented by the pawl—in a basically known manner.

As already described, the movement of the second clamping device in the bracing direction can preferably be triggered by operating the handle of the ratchet mechanism, as a result of which the ratchet wheel or ratchet wheels are moved and the webbing is rolled up. After releasing the pawl, the webbing can be unrolled again.

The device according to the invention for erecting boundaries for bodies to be cast, in particular concrete bodies, having a plurality of frame formwork elements, provides that at least two adjacent frame formwork elements are clamped together with at least one, preferably several, of the aforementioned turnbuckles according to the invention.

The concrete body to be created can in particular be a wall element.

It is advantageous if the turnbuckles for bracing two panel formwork elements are arranged vertically offset from one another on a straight line such that the bracing movements of the clamping jaws of the turnbuckles run parallel to one another.

It has turned out to be particularly suitable if the turnbuckles for bracing two adjacent frame formwork elements are offset vertically relative to one another or offset one below the other/above one another. The arrangement is preferably such that the turnbuckles are arranged on a (vertical) straight line such that the bracing movements of the clamping jaws of the turnbuckles, i.e. the displacements of the second clamping devices in the bracing direction or counter to the bracing direction, run parallel to one another.

Features that were disclosed in connection with the turnbuckle according to the invention are basically also suitable for use in the device according to the invention. Advantages therefore apply analogously.

In addition, it should be pointed out that terms such as "comprising", "having" or "with" do not exclude any other features or steps. Furthermore, terms such as "a" or "that" which indicate a singular number of steps or features do not exclude a plurality of features or steps - and vice versa. The figures show a preferred exemplary embodiment in which individual features of the present invention are shown in combination with one another. Features of the embodiment can also be implemented separately from the other features of the embodiment.

Elements with the same function are provided with the same reference symbols in the figures.

It shows:

FIG. 1 shows an arrangement of three frame formwork elements, the middle frame formwork element being clamped to the outer frame formwork elements via three turnbuckles according to the invention;

FIG. 2 shows a perspective view of a turnbuckle, with a handle for operating the ratchet wheel being applied;

FIG. 3 shows a further perspective view of a turnbuckle in the position shown in FIG. 1;

FIG. 4 shows a side view of a turnbuckle with a handle raised for operating the ratchet wheel;

FIG. 5 shows a plan view of a turnbuckle in the position shown in FIG. 4;

FIG. 6 shows a section through a turnbuckle along line VI-VI of FIG. 5;

FIG. 7 shows a perspective view of the sectional illustration according to FIG. 6;

FIG. 8 shows a further perspective view of the sectional illustration according to FIG. 6;

FIG. 9 shows a perspective view of a turnbuckle in the position shown in FIG. 4;

FIG. 10 shows a further perspective view of a turnbuckle in the position shown in FIG. 4; and

FIG. 11 shows a section through a turnbuckle in the position shown in FIG.

FIG. 1 shows six turnbuckles 1 according to the invention, which connect panel formwork elements 2 to one another. A panel formwork element 2 in the center in the plane of the figure forms a right-angled outer corner with a panel formwork element 2 on the right in the plane of the figure. To brace the two Frame formwork elements 2 are provided by way of example three turnbuckles 1. The frame formwork element 2 in the middle in the plane of the drawing is also connected to a frame formwork element 2 on the left in the plane of the picture, which run together in one plane, also by means of three turnbuckles 1 according to the invention.

The turnbuckles 1 according to the invention are fundamentally suitable for connecting or bracing two adjacent panel formwork elements 2 to one another, with inner corners, outer corners, articulated corners and stop-end formwork in particular being able to be connected using the turnbuckles 1 according to the invention.

The turnbuckles 1 according to the invention are also suitable for connecting a panel formwork element 2 to an adjacent compensating element. Such compensating elements also represent frame formwork elements within the scope of the present invention.

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 adjoining frame formwork elements 2 flush, aligned and tightly to one another.

The turnbuckles 1 according to the invention serve in particular to connect two panel formwork elements 2 positioned next to one another, which run in a common plane, to one another, as illustrated in FIG.

The turnbuckles 1 according to the invention are generally arranged in the area of intersections of horizontally running struts 3 and vertically running frame elements 4 of the panel formwork elements 2, as is shown by way of example with regard to the panel formwork element 2 in the center of the image plane and the left panel formwork element 2 in Figure 1.

The frame formwork elements 2 have, in a way that is not described in detail, a formwork skin which faces the material to be filled in and to be hardened.

The frame formwork elements 2 are preferably frame formwork elements for producing bodies to be cast, in particular concrete bodies, in particular parts of buildings.

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

The frame formwork elements 2 abut one another in a known manner with an interface. the

Interface is in Figure 1 as a boundary line 5 between the middle panel formwork element 2 and the right frame formwork element 2 or the middle frame formwork element 2 and the left frame formwork element 2 are shown.

In the exemplary embodiment, the boundary line 5 is spanned by three turnbuckles 1 in each case, with fewer or more turnbuckles 1 also being able to be provided.

The turnbuckles 1 each also span a vertically running frame element 4 of the frame formwork elements 2 to be connected to each other. Furthermore, the turnbuckles 1 are preferably arranged on the horizontally running struts 3 of the frame formwork elements 2, in particular in the same way as is the case with the three turnbuckles 1 that middle frame formwork element 2 connect to the left frame formwork element 2, is shown.

The exemplary embodiment of a turnbuckle according to the invention according to FIGS. 2 to 11 shows a particularly advantageous design, so that the turnbuckles 1 can be arranged on the horizontally running struts 3 .

The turnbuckle 1 shown in FIGS. 2 to 11 has a first clamping device 6 and a second clamping device 7, which together form the turnbuckle 1 in the exemplary embodiment.

The first clamping device 6 has a traverse 8 which is preferably designed in one piece with a first clamping jaw 9 .

The first jaw 9 is rigidly or fixedly or immovably connected to the traverse 8 .

The traverse 8 has a preferably flat or planar upper side 10, preferably without protruding elevations. Provision is made in the exemplary embodiment for the second clamping device 7 to be displaceable on or along the upper side 10 .

In the exemplary embodiment, the traverse 8 is preferably a tubular element, preferably with an essentially rectangular, in particular square, cross section.

In the exemplary embodiment, the upper side 10 is formed in one piece with the traverse 8 .

The second clamping device 7 of the turnbuckle 1 has a second clamping jaw 14 .

The first jaw 9 and, analogously, the second jaw 14 each have two claws 9a and 14a, respectively. The distance between the claws 9a and 14a is preferably selected in such a way that a horizontally running strut 3 can be accommodated between the claws 9a and the claws 14a. The second clamping jaw 14 or the second clamping device 7 can be displaced in a bracing direction along the longitudinal axis of the traverse 8 in the direction of the first clamping jaw 9 . The bracing direction is denoted by the arrow A in FIGS.

In the exemplary embodiment, it is provided that the second clamping device 7 is captively connected to the traverse 8 of the first clamping device 6 or is arranged captively on the traverse 8 .

For this purpose, it can be provided that a movement of the second clamping device 7 counter to the bracing direction is limited by protrusions 23 and/or limit stops, with the protrusions 23 and/or the limit stops being arranged in such a way that the second clamping device 7 can be separated from the traverse 8 counter to the bracing direction is not deductible.

For this purpose, the exemplary embodiment provides that the traverse 8 has the corresponding formations 23 or the limit stops, which can also be pins or edges that interact with correspondingly complementary elements on the second clamping device 7 in such a way that the second clamping device 7 cannot be deducted from the traverse 8 against the direction of bracing. For this purpose, the formations 23 and/or the limiting stops are preferably arranged, as shown in the exemplary embodiment, in the region of a second end 8b of the traverse 8 facing away from the first clamping jaw 9 .

The formations 23 and/or the limit stops are preferably formed at the second end 8b of the traverse 8 as projections from the traverse 8 .

Loss protection in the bracing direction can preferably result from the fact that the first clamping jaw 9 and the second clamping jaw 14 collide with one another, i.e. stand in the way of one another in the bracing direction, when the second clamping device 7 is displaced to an end point in the bracing direction A.

In order to move the second clamping device 7 in and counter to the bracing direction along the longitudinal axis of the traverse 8, the traverse 8 and the second clamping device 7 in the exemplary embodiment form a guide which is designed in such a way that the second clamping device 7 is guided along the longitudinal axis of the traverse 8 is movable in the bracing direction and counter to the bracing direction. The guide is preferably designed as a rail guide. The upper side 10 of the traverse 8, in particular the longitudinal edges of the upper side 10, which for this purpose preferably protrude beyond a first or a second longitudinal side 12, 13 of the traverse 8, can represent parts of the guide. The underside of the second clamping device 7 facing the longitudinal edges of the upper side 10 can be designed in a correspondingly complementary manner to form the guide. In the case of the turnbuckle 1 shown in the exemplary embodiment, a tensioning device 26 with a ratchet mechanism 27 is provided according to the invention in order to move and tension the second clamping device 7 in the tensioning direction along the longitudinal axis of the traverse 8 in the direction of the first clamping jaw 9.

In the exemplary embodiment, the ratchet mechanism 27 is fixed to the second clamping device 7 .

The ratchet mechanism 27 preferably includes at least one ratchet wheel 28 and at least one pawl 29 to prevent the ratchet wheel 28 from rotating backwards.

In the exemplary embodiment, two ratchet wheels 28 coupled to one another and a pawl 29 are provided. The ratchet blade 29 engages in the two ratchet wheels 28 .

The pawl 29 can be released against the force of a spring element 30 in order to enable the ratchet wheels 28 to rotate backwards or to remove the blockage by the ratchet blade 29 . For this purpose, the pawl 29 in the exemplary embodiment is moved counter to the bracing direction A until the pawl 29 no longer engages in the ratchet wheels 28 or between two teeth of the ratchet wheels 28 . The tension between the two clamping jaws 9, 14 can thus be released again if necessary.

To operate the ratchet mechanism 27, a handle 31 is provided in a basically known manner. The handle 31 has a clamping element 34 which engages in the ratchet wheels 28 or between two teeth of the ratchet wheels 28 so that a rotary movement of the handle 31 via the clamping element 34 leads to a corresponding rotation of the ratchet wheels 28 . The clamping element 34 is preferably connected to the handle 31 in such a way that the clamping element 34 can be pulled out of engagement with the ratchet wheels 28 against the force of a spring. This can be advantageous in order to facilitate backward movement of the handle 31 in which the ratchet wheels 28 do not rotate or cannot rotate because the ratchet wheels 28 are held in position by the pawl 29 . For this purpose it is also provided that the teeth of the ratchet wheels 28 are designed in such a way that the clamping element 34 slides out of the tooth troughs of the teeth of the ratchet wheels 28 during a backward movement.

The coupled ratchet wheels 28 can be set in rotation by the handle 31, as a result of which the second clamping device 7 is then displaced in the clamping direction along the longitudinal axis of the traverse 8 in the direction of the first clamping jaw 9 and clamped. The handle 31 is moved from the position shown in Figures 2, 3 and 11 to the position shown in Figures 4 to 10 to produce the rotational movement. As a result, the ratchet wheels 28 are rotated accordingly, as a result of which the second clamping device 7 moves in the bracing direction A—due to the known functional principle, which is also explained in more detail below. From the position shown by way of example in FIGS. 4 to 10, the handle 31 then returns to the starting position (Figures 2, 3 and 11) is moved back, the ratchet wheels 28 not turning during this backward movement of the handle 31 due to the known principle of operation.

The tensioning device 26 has a belt strap 32 . A first end 32a of the webbing 32 is fixed to the first clamping device 6, preferably to the traverse 8. The belt strap 32 is preferably fixed in the area of a first end 8a of the cross member 8 facing the first clamping jaw 9 .

In the exemplary embodiment, a fastening element 11 is fixed to the traverse 8 . The fastener is designed as a bolt 1 1 in the embodiment. The bolt 1 1 extends orthogonally between the two long sides 12,13 of the traverse 8.

The first end 32a of the webbing 32 is fixed to the bolt 11 .

A second end 32b of the webbing 32 is fixed to a winding drum 33, preferably in a longitudinal slot of the winding drum 33. The winding drum 33 is mechanically connected to the ratchet wheels 28 such that—in a known manner—a rotation of the ratchet wheel 28 caused by the handle 31 causes the winding drum 33 to rotate in such a way that the webbing 32 is wound onto the winding drum 33. As a result, the clamping device 7 is moved steplessly in the clamping direction A or in the direction of the first clamping jaw 9 .

The handle 31 can be operated until the clamping jaws 9 and 14 clamp the frame formwork elements 2 to be clamped together in a suitable manner.

To release the tension, the pawl 29 and also the tensioning element 34 can be disengaged from the ratchet wheels 28 in a basically known manner, so that the pawl 29 and the tensioning element 34 do not prevent the ratchet wheel 28 from rotating backwards. The webbing 32 can thus be unwound from the winding drum 33 again and the second clamping device 7 can be moved again in the opposite direction to the bracing direction.

Clamping devices 26 with a ratchet mechanism 27 in various embodiments are known from the prior art. The turnbuckle 1 according to the invention should not be understood to be limited to a specific embodiment of a tensioning device 26 . Nevertheless, the clamping device 26 shown in FIGS. 2 to 11 is particularly suitable for the turnbuckle.

The exemplary embodiment also discloses a device 20 according to the invention for erecting boundaries for bodies to be cast, in particular concrete bodies, having a plurality of panel formwork elements 2, such as are shown by way of example in FIG. At least two adjacent frame formwork elements 2 of the device 20 are clamped together with at least one, preferably several, of the turnbuckles 1 according to the invention. The bodies to be cast can in particular be wall elements made of concrete. The turnbuckles 1 for bracing the frame formwork elements 2 are preferably arranged vertically offset from one another on a straight line in such a way that the bracing movements of the clamping jaws 9, 14 of the turnbuckles 1 run parallel to one another. For this purpose, the arrangement of the turnbuckles 1 in FIG. 1 is referred to as an example. The straight line on which the turnbuckles 1 are vertically offset from one another, i.e. arranged above and below one another, preferably runs parallel to the boundary line 5.

Claims

Patent claims turnbuckle (1) for clamping frame formwork elements (2), with a first clamping device (6) having a crossbar (8) and a first clamping jaw (9) and with a second clamping device (7) having a second Clamping jaw (14), the second clamping device (7) being displaceable in a clamping direction along the longitudinal axis of the traverse (8) in the direction of the first clamping jaw (9), characterized in that a clamping device (26) with a ratchet mechanism (27 ) is provided in order to move and clamp the second clamping device (7) in the clamping direction along the longitudinal axis of the traverse (8) in the direction of the first clamping jaw (9). Turnbuckle according to claim 1, characterized in that the ratchet mechanism (27) has at least one ratchet wheel (28) and at least one releasable pawl (29) to prevent reverse rotation of the ratchet wheel (28). Turnbuckle according to Claim 1 or 2, characterized in that the ratchet mechanism (27) is fixed to the second clamping device (7). Turnbuckle according to Claim 2 or 3, characterized in that the clamping device (26) has a handle (31) in order to set the ratchet wheel (28) in rotation and the second clamping device (7) in the clamping direction along the longitudinal axis of the traverse (8). to move and clamp in the direction of the first jaw (9). Turnbuckle according to one of Claims 1 to 4, characterized in that the tensioning device (26) has a webbing (32), a first end (32a) of the webbing (32) being fastened to the first clamping device (6), preferably to the traverse (8th ), is fixed. Turnbuckle according to Claim 5, characterized in that the webbing (32) is fixed in the region of a first end (8a) of the traverse (8) facing the first clamping jaw (9). Turnbuckle according to claim 5 or 6, characterized in that a fastening element (11), preferably a bolt, is fixed to the traverse (8), preferably in such a way that the fastening element (11) extends orthogonally between two longitudinal sides (12,13) of the traverse (8), the first end ( 32a) of the webbing (32) is fixed to the fastening element (11).

8. Turnbuckle according to Claim 5, 6 or 7, d a d u r c h g e k e n n z e i c h n e t that a second end (32b) of the webbing (32) is fixed to a winding drum (33), the winding drum (33) being mechanically connected to the ratchet wheel (28) in such a way that a rotation of the ratchet wheel (28) caused by the handle (31) leads to a rotation of the winding drum (33) such that the webbing (32) is wound onto the winding drum (33).

9. Turnbuckle according to one of claims 1 to 8, d a d u r c h g e k e n n z e i c h n e t that the second clamping device (7) is arranged captively on the traverse (8).

10. Turnbuckle according to Claim 9, d a d u r c h g e k e n n z e i c h n e t that a movement of the second clamping device (7) counter to the clamping direction is limited by protrusions (23) and/or limit stops, the protrusions (23) and/or the limit stops being arranged in such a way that the the second clamping device (7) cannot be pulled off the traverse (8) counter to the bracing direction.

11. Turnbuckle according to claim 10, d a d u r c h g e k e n n z e i c h n e t that the formations (23) and/or the limit stops on the crossbar (8), preferably in the area of a second end (8b) of the crossbar (8) facing away from the first clamping jaw (9), and the formations (23) and/or the limit stops interact with correspondingly complementary elements on the second clamping device (7) in such a way that the second clamping device (7) cannot be pulled off the traverse (8) counter to the bracing direction.

12. Turnbuckle according to one of claims 9, 10 or 11, d a d u r c h g e k e n n z e i c h n e t that a loss protection in the clamping direction is realized in that the first clamping jaw (9) and the second clamping jaw (14) are arranged in such a way that the clamping jaws (9, 14) limit a movement of the second clamping device (7) in such a way that the second clamping device (7) cannot be pulled off the traverse (8) in the bracing direction.

13. Turnbuckle according to one of claims 1 to 12, 19 characterized in that a guide is provided which is designed such that the second clamping device (7) guided along the longitudinal axis of the traverse (8) in the bracing direction and against the bracing direction is movable. Device (20) for erecting boundaries for bodies to be cast, in particular concrete bodies, having a plurality of panel formwork elements (2), at least two panel formwork elements (2) adjoining one another having at least one, preferably a plurality of turnbuckles (1) according to one of Claims 1 to 13 are clamped together. Apparatus according to Claim 14, characterized in that the turnbuckles (1) for clamping two panel formwork elements (2) are arranged vertically offset from one another on a straight line such that the clamping movements of the clamping jaws (9, 14) of the turnbuckles (1) run parallel to one another .