EP2424810B1 - Lifting hook - Google Patents

Description

The invention relates to a Versetzhaken for moving Betonschalungselementen with a hook having an opening for receiving a frame profile of the concrete formwork element, and a pivotable about a pivot pin on the hook about a pivot axis from a blocking position via a blocking position in a release position and forth mounted safety latch with at least one locking surface. In this case, in the blocking position of the securing pawl, the opening is blocked such that picking up of a frame profile in the opening is prevented and in the blocking position a frame profile accommodated in the opening is secured by abutment of the blocking surface on the frame profile.

Such a Versetzhaken is in the DE 31 11 634 A1 disclosed. In a region of the hook in which the pivot pin is arranged, a ring-forming bracket is attached to the hook, which serves to attach a crane hook for attracting the Versetzhakens when moving a Betonschalungselements. The safety pawl is held by gravity in the locked position and therefore can easily fall out of the locked position, if, for example, shortly after receiving the frame profile of the concrete formwork element in the opening of the hook, the Versetzhaken is not yet sufficiently tensioned by the crane hook that a Chain or a pull rope to which the crane hook is attached, is tightened.

Improved Versetzhaken therefore have in a region facing away from the locking surface of the safety latch fastening means for securing a chain, which serves for freight lift. When loading the fastener by a tensile force by means of the chain, the safety latch is thereby forced into the blocking position or blocking position. The latter is achieved in that by pulling on the fastening means a torque is exerted about the pivot pin, whereby the tensile force is deflected into a compressive force on the, relative to the pivot pin, the fastening means opposite side of the seepage pawl. Such a recorded in the opening of the hook frame profile of a concrete formwork element can be kept very safe in Versetzhaken.
In the improved Versetzhaken, however, there is the problem that the safety latch always remains in the locked position or blocking position without their pivoting by an operator. To the To pivot the safety latch in the release position, the operator must therefore reach to the Versetzhaken with mostly both hands. The latter leads, in particular in the case of high concrete formwork elements, to the fact that the operator, for example, has to climb onto a ladder.

The invention has for its object to provide a Versetzhaken for moving concrete formwork elements in the construction sector, which avoids the disadvantages of the prior art, in particular with a lighter and safer handling of the Versetzhakens is possible.

This object is achieved by the Versetzhaken according to the independent claim. The dependent claims represent preferred embodiments of the invention.

The Versetzhaken invention for moving concrete formwork elements, with a hook having an opening for receiving a frame profile of the concrete formwork element, and a pivotable about a pivot pin on the hook about a pivot axis from a blocking position via a locking position to a release position and pivotally mounted locking pawl the at least one blocking surface is formed. In the blocking position, the securing pawl blocks the opening such that receiving a frame profile is prevented in the opening and in the blocking position is a recorded in the opening frame profile by concerns of Locking surface secured to the frame profile. In a remote from the blocking surface area of the securing pawl fastening means are provided for securing a chain, such that when loading the fastening means by a tensile force by means of the chain, the securing pawl is forced into the blocking position and / or the blocking position. The remote area is thus located on the securing pawl that acts by a force acting on the fastening means by means of the chain tension a torque about the pivot axis, and the blocking surface in a direction against the tensile force, ie when lifting the Versetzhakens by means of the chain in one after down direction, is pressed.
According to the invention, an operating extension for pivoting the securing pawl from the blocking position to the release position is provided on an end region of the securing pawl facing away from the attachment means, wherein the operating extension is set up to engage substantially perpendicularly to the pintle by an operating rod.

The stowing hook according to the invention can thus be operated by means of an operating rod, such as a reinforcing bar, eg from below, wherein the pawl can be pivoted from the blocking position, or the blocking position in the release position, that in the release position either a frame profile from the opening of the hook can be removed or a frame profile can be included therein. An operator can pivot by means of the operating rod, the safety latch and does not have to rise to their operation, for example, on a ladder. The handling of the Verstellhakens invention is therefore much easier to use than the handling of known Versetzhaken. The latter not only increases occupational safety, but can also lead to an acceleration of the work processes when moving concrete formwork elements.

Preferably, the operating extension has a hole for receiving a free end of the operating rod, in particular wherein the hole is provided in a control plate provided on the operating panel. In this way, a free end of the operating rod can easily and securely engage the operating extension without the free end being able to slip.

The hook according to the invention advantageously has two side plates arranged parallel to one another, wherein the side plates are connected to one another by the pivot pin and at least one connecting strut and wherein the securing pawl is arranged between the side plates. In this way, a very robust design of the Versetzhakens ensure, in particular, the safety latch is arranged protected by the side plates.

If, at least in the blocking position, the side plates preferably completely cover the operating extension, the operating extension can not catch on objects occurring in the operating region of the displacing hook, ie not in the chain as well. The operating extension then remains, especially when the Versetzhaken is raised by pulling on the chain, within the dimensions of the side plates.

If a spring mechanism is provided, wherein the spring mechanism pushes the safety pawl in the blocking position and / or the blocking position, the safety pawl can be held automatically in a protected position within the side plates even without traction by a chain.

If the locking pawl has two locking surfaces, frame profiles of different thicknesses can be secured particularly securely in the opening of the hook.

Particularly preferred in the region of a free pivot end of the hook a passage for a provided on the fastening means of the securing pawl for securing chain is formed. This passage serves as a chain deflector for the chain, which is attached to the fastening means of the securing pawl. That it is avoided that the chain in the relaxed state, i. if no tensile force is applied to the chain, falls into the opening of the hook, making it impossible to attach the hook to a frame profile.

Particularly advantageous is the implementation of the pivot pin near free end bounded by a connecting the side plates bolt. In this way, the passage can be easily formed between the side plates.

The invention will be explained in more detail by means of embodiments with reference to the drawings.

The FIGS. 1a and 1b show a Versetzhaken invention, wherein the securing pawl is pivoted by means of an operating rod in its release position.

The FIGS. 2a and 2 B show the Versetzhaken invention, wherein the securing pawl is in the locked position and a recorded in the opening of the hook of the Versetzhakens frame profile is secured by abutment of the locking surface on the frame profile.

The FIGS. 3a and 3b show the Versetzhakens invention, wherein the locking pawl blocked in the blocking position, the opening of the hook of the Versetzhakens such that a receiving a frame profile in the opening is prevented.

FIG. 4 shows the Versetzhaken the FIGS. 1 to 3 in another view.

The figures of the drawings show the subject matter of the invention in a highly schematic manner and are not to scale. The individual components of the article according to the invention are shown so that their structure can be well shown.

In the FIGS. 1a and 1b an inventive Versetzhaken 1 is shown, wherein the securing pawl 2 is pivoted by means of an operating rod 3 in its release position. In FIG. 1a is a sectional view through the Versetzhaken 1 in a sectional plane perpendicular to Pivot 5 of the Versetzhakens 1 shown. In FIG. 1b an oblique perspective view of the Versetzhakens 1 is shown.
The Versetzhaken 1 has a hook 7 with a C-shaped basic shape, whereby the hook 7 has an opening 8 for receiving a frame profile 9 of a concrete formwork element. In the region of a lower free end of the hook 7, a nose 10 projecting into the opening is provided, which is designed to engage in a recess in the frame profile 9.
The hook 7 is formed by two mutually parallel side plates 12 made of flat steel. The side plates 12 are interconnected by the pivot pin 5 and a plurality of connecting struts 14. The connecting struts 14 may be welded to the side plates 12, for example. In the illustrated Versetzhaken 1, the connecting struts 14 of two flat steel parts and a hollow section steel are formed with a substantially square cross-section.

Another connecting strut is formed by a bolt connecting the side plates 12 17 in the region of a free end of the hook 7 near the pivot pin. This bolt 17 further limits a passage 18 for a chain 19, by means of which the Versetzhaken 1 is to raise, ie by means of which train on the Versetzhaken 1 is exercised, so usually by hooking the chain 19 is lifted to a crane hook the Versetzhaken 1. The passage 18 is bounded by the side plates 12, the bolt 17 and one of the flat steel parts. Due to the arrangement of the passage 18 in the region of the pivot pin near free end of the hook 7 is from the bolt 17 or from the entire bushing 18 a chain deflector for the chain 19 is formed. This prevents the chain 19 from blocking the opening 8.

The safety pawl 2 is pivotable about a pivot axis formed by the pintle 5 from a blocking position to a locked position in the illustrated release position and disposed between the side plates 12. The pivoting is in FIG. 1a symbolically represented by a curved double arrow. The pivot pin 5 is arranged in an upper region of the hook 7. The safety latch 2 has two locking surfaces 20. Depending on the thickness of the frame profile 9, the upper, ie the pivot pin near, or the lower, ie the drehbolzenfernere, the blocking surfaces 20th comes in this case, to secure a received in the opening 8 frame profile 9 by abutment of the locking surface 20 to the concern to the respective frame profile 9. The safety latch 2 is essentially made of a flat steel, to which the likewise formed by a flat steel locking surfaces 20 are fixed with their main planes perpendicular to each other.

In a remote from the locking surfaces 20 area of the securing pawl 2 fastening means 30 are provided for attaching the chain 19. These fastening means 30 are designed as a slot in the securing pawl 2, which adjoins one end of the pivot pin 5. In the slot, the chain 19 engages with one of its chain links 31, ie the last chain link 31 of the chain 19 surrounds the free end of the safety pawl 2. The area in which the fastening means 30 are arranged, is so remote from the locking surfaces 20, that when loading the fastener 30 by a, in particular with a component upwardly acting tensile force F _Z by means of the chain 19, the safety pawl 2 is forced into the blocking position, ie a torque is applied to the pivot pin 5 around, by means of which the blocking surfaces 20 down, against the pulling direction, be pressed.

At an end region of the securing pawl 2 facing away from the fastening means 30, an operating extension 35 is provided for pivoting the securing pawl 2 from the blocking position via the blocking position into the release position. This operating extension 35 is set up to engage the operating rod 3 in a direction substantially perpendicular to the pivot pin 5, so that a correspondingly directed pressure force F _{D can be} exerted on the operator extension 35 and thus the securing pawl 2 with the operating rod 3. The operating rod 3 can be formed by a simple iron rod, for example made of reinforcing steel. In order to easily reach the operating extension 35 with the operating rod 3, the hook 7 is designed to be open in the region in which the operating extension 35 is arranged. That is, in this area no connecting struts 14 are arranged between the side plates 12 of the hook 7.

The operating extension 35 has a hole 36 for receiving a free end of the operating rod 3. This hole 36 is provided in a provided on the operating extension 35 control plate 37 which is located in a plane which is parallel to the pivot pin 5. When a free end of the operating rod 3 is passed through the hole 36 as shown, it bumps the free end of the operating rod 3 to a lying behind the hole 36, formed by the flat steel of the securing blade 2 region of the operating extension 35 at. By exerting a compressive force F _D on the operating extension 35 by means of the operating rod 3, ie by pushing up the operating rod 3, a torque is exerted about the pivot pin 5, whereby the securing pawl 2 is pressed or pivoted into its release position.

In the FIGS. 2a and 2 B is the Versetzhaken 1 off FIG. 1a and 1b shown that its safety pawl 2 is in the locked position and a received in the opening of the hook 7 of the Versetzhakens 1 frame profile 9 is secured by abutment of the locking surface 20 on the frame section 9. In FIG. 2a is a sectional view through the Versetzhaken 1 in a sectional plane perpendicular to the pivot pin 5 of the Versetzhakens 1 shown. In FIG. 2b an oblique perspective view of the Versetzhakens 1 is shown.
Since the frame profile 9 has a relatively large thickness, the upper locking surface 20 rests against the frame profile 9 for securing it. The nose 10 at the lower free end of the hook 7 engages in a recess 40 in the frame section 9. In order to remove the hook 7 from the frame profile 9, ie the frame profile 9 from the opening 8 of the hook 7, the hook 7 must first be tilted slightly in the direction of the curved arrow shown by means of the operating rod 3. Then, by means of the operating rod 3, an upward force F _{D is} exerted and the securing pawl 2 is pivoted into its release position, whereupon the frame profile 9 can be removed from the opening 8, or the transfer hook 1 can be removed from the frame profile 9.

The operating extension 35 does not protrude perpendicularly to the pivot pin 5 substantially beyond the dimensions of the side plates 12 of the hook 7. That at least in the blocking position, the side plates 12 almost completely cover the operating extension 35 perpendicular to the pivot pin 5 and the operating extension 35 remains within the dimensions of the side plates 12.

In FIGS. 3a and 3b is the Versetzhaken 1 off FIG. 1a and 1b shown so that its locking pawl 2 blocked in the blocking position, the opening 8 of the hook 7 of the Versetzhakens 1 such that a receiving a frame profile in the opening 8 is prevented. This position of the securing pawl 2 is then assumed when no frame profile is arranged in the opening 8 of the hook 7 and a vertically upward pulling force F _{Z of} sufficient strength is exerted by the chain 19 on the securing pawl 2.
In FIG. 3a is a sectional view through the Versetzhaken 1 in a sectional plane perpendicular to the pivot pin 5 of the Versetzhakens 1 shown.
In FIG. 3b is an oblique perspective view of the Versetzhakens 1 with a view from below, ie in the engagement direction of the operating rod 3, shown. In the illustration, the operating rod 3 for exerting a compressive force F _D to pivot the safety pawl 2 in its release position, inserted with its free end in the hole 36 of the operating extension 35.

FIG. 4 shows the Versetzhaken the FIGS. 1a to 3b in another view. The viewing direction of this view is so perpendicular to the pivot pin 5 that the shape of the parallel to the pivot pin 5 aligned Parts of the arranged between the side plates 12 of the hook 7 securing pawl 2 is clearly visible. In particular, the position of the blocking surfaces 20 forming parts and the control panel 37 of the operating extension 35 is clearly visible. In the lower part of the figure, the free end of an operating rod 3 is located. The operating rod 3 is aligned so that it engages in a further perpendicular to the pivot pin 5 directed movement into the hole 36 of the operating extension 35.

In the illustrated Versetzhaken 1, a spring mechanism 40 is provided which presses the safety pawl 2 in the blocking position and / or the blocking position. This spring mechanism 40 has one around a steel spring 42 which is guided around a screw 41 screwed into one of the side plates 12 and engages one end on the safety pawl 2 and another end is locked on the hook 7.

Proposed is a Versetzhaken 1 for moving Betonschalungselementen with a hook 7 having an opening 8 for receiving a frame profile 9 of the concrete formwork element, and one about a pivot pin 5 on the hook 7 about a pivot axis of a blocking position via a blocking position in a release position - And pivotally mounted locking pawl 2 with at least one locking surface 20, wherein in the blocking position, the locking pawl 2, the opening 8 blocked so that a receiving a frame profile 9 in the opening 8 is prevented and in the blocking position a recorded in the opening 8 frame profile 9 is secured by concerns the blocking surface 20 on the frame profile 9, and wherein in a remote from the blocking surface 20 of the securing pawl 2 fastening means 30 are provided for attaching a chain 19, such that when loading the fastener 30 by a tensile force by means of the chain 19, the safety pawl 2 is forced into the blocking position and / or the blocking position ,
In this case, an operating extension 35 is provided for pivoting the securing pawl 2 from the blocking position into the release position on a fastening element 30 facing away from the end of the locking pawl 2, wherein the operating extension 35 is arranged to a substantially perpendicular to the pivot pin 5 intervention by an operating rod 3.

The invention is not limited to the embodiments given above. Rather, a number of variants are conceivable, which make use of the features of the invention even with fundamentally different type of execution.

Claims (8)

1. Lifting hook (1) for moving concrete formwork elements comprising a hook (7) with an opening (8) for receiving a frame profile (9) of the concrete formwork element, and a safety latch (2) which is disposed via a pivot pin (5) on the hook (7) such that it is pivotable back and forth about a pivot axis from a blocking position via a locked position into a release position and comprises at least one blocking surface (20), wherein in the blocking position, the safety latch (2) blocks the opening (8) such that reception of a frame profile (9) in the opening (8) is prevented and in the locked position, a frame profile (9) received in the opening (8) is secured in that the blocking surface (20) abuts the frame profile (9),
   characterized in that fastening means (30) are provided in an area of the safety latch (2) remote from the blocking surface (20) for fastening a chain (19) such that when the fastening means (30) are loaded by a tractive force by means of the chain (19), the safety latch (2) is forced into the blocking position and/or the locked position, wherein an operator extension (35) is provided in an end area of the safety latch (2) facing away from the fastening means (30) for pivoting the safety latch (2) from the blocking position into the release position, wherein the operator extension (35) is designed for engagement by an operating rod (3) in a direction substantially perpendicular to the pivot pin (5).
2. Lifting hook according to claim 2, characterized in that the operator extension (35) has a hole (36) for receiving a free end of the operating rod (3), preferably wherein the hole (36) is provided in a control panel (37) provided on the operator extension (35).
3. Lifting hook according to any one of the claims 1 to 2, characterized in that the hook (7) has two side plates (12) that are arranged parallel with respect to one another, wherein the side plates (12) are connected to each other by the pivot pin (5) and at least one cross member (14) and wherein the safety latch (2) is arranged between the side plates (12).
4. Lifting hook according to claim 3, characterized in that the side plates (12) preferably completely cover the operator extension (35) at least in the locked position.
5. Lifting hook according to any one of the claims 1 through 4, characterized in that a spring mechanism (40) is provided, wherein the spring mechanism (40) forces the safety latch (2) into the blocking position and/or the locked position.
6. Lifting hook according to any one of the claims 1 to 5, characterized in that the safety latch (2) has two blocking surfaces (20).
7. Lifting hook according to any one of the claims 1 to 6, characterized in that a feed-through (18) is formed in the area of a free end of the hook (7) close to the pivot pin for a chain (19) provided to be fastened to the fastening means (30) of the safety latch (2).
8. Lifting hook according to claim 7 and claim 3, characterized in that the feed-through (18) is limited at the free end close to the pivot pin by a bolt (17) that connects the side plates (12).

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