EP0343309B1 - Wire twisting device - Google Patents

Abstract

The wire twisting device has a twisted bar (1) with a binding hook (4) which is set in rotation when a gripping part is pulled. The binding hook can be swivelled about an axis (5) and is held in the normal position by a locking slide (7) engaging in indentations (6) in the binding hook. When pulling the wire loop around the binding hook, a latch (13) is lifted, by which means the locking slide and thus the binding hook are unlocked and swivelled, by which means it can slide out of the wire loop. <??>A device of this type allows a constant and optimum twisting of the wire without the risk of it tearing and permits the automatic pulling out of the binding hook in the same pulling movement. <??>The formed wire for tying reinforced iron bars is constructed as a single wire hoop (17) with a welding point (23). By this means, on the one hand its manufacture is simplified and material is saved and, on the other hand, a firm tying is guaranteed. <IMAGE>

Description

The present invention relates to a device for twisting wires, having a twisted rod which is rotated when a handle part is pulled and is provided with a binding hook for gripping a wire loop.

A large number of devices for twisting wires are known for carrying out the fastening of reinforcing irons, this work being mostly carried out by specialists in the chord. The reinforcing bars used for the manufacture of reinforced concrete structures are usually orthogonal to each other and must be connected to each other at their crossing points. At the moment there is a simple device, which mainly depends on the skill and endurance of the specialized worker. Prefabricated wire loops are used, which have rings or eyelets at both ends. As a result of the desired flexibility and thus the small thickness of the wire, two of these wire loops are put by hand around the rods to be connected for safety reasons and the four wire eyelets are gripped by a twisting device. This twisting device consists of a rod with a hook, the rod being twisted and running in a corresponding handle, so that when the handle is pulled, the rod and thus the hook are set in rotation. Around the end of the twisting process, and this is exclusively a matter of the experience and skill of the operator, the hook is removed from the rings or eyelets. If the loops are tightened too much, they may break. Therefore, the people working in the chord will be careful not to tighten the loops too tight, which may result in a connection that is too loose.

Based on this, it is an object of the present invention to provide a device for twisting wires, which always ensures maximum fastening and enables the binding hook to be released automatically from the loop. A device that solves this problem is described in the claims.

The device according to the invention can be used with particular advantage in connection with a device for connecting at least two rods according to PCT-A-WO87 / 01753, after which the connection of two reinforcing iron rods from above without having to pull the wire by hand under the iron, he follows.

Fig. 1

zeigt in Seitenansicht und teilweise geschnitten, den erfindungswesentlichen Teil der Vorrichtung zum Verdrillen,

Fig. 2

Zeigt einen Schnitt gemäss der Linie II-II von Fig. 1,

Fig. 3

zeigt einen Schnitt gemäss der Linie III-III von Fig. 1,

Fig. 4

zeigt einen Schnitt gemäss der Linie IV-IV von Fig. 1,

Die Fig. 5 bis 7

zeigen drei Phasen beim Verdrillvorgang mit der Vorrichtung gemäss Fig. 1,

Fig. 8

zeigt ein Draht-Formteil und

Fig. 9

zeigt eine Drahtschlaufe.

The invention is explained below with reference to a drawing of exemplary embodiments.

Fig. 1

shows in side view and partially in section, the part of the device for twisting essential to the invention,

Fig. 2

Shows a section along the line II-II of Fig. 1,

Fig. 3

shows a section along the line III-III of Fig. 1,

Fig. 4

shows a section along the line IV-IV of Fig. 1,

5 to 7

show three phases in the twisting process with the device according to FIG. 1,

Fig. 8

shows a wire molding and

Fig. 9

shows a wire loop.

In Fig. 1 the lower part of a device is shown, i.e. the binding hook and a mechanism for pivoting and releasing the same. This release mechanism makes it possible to twist the wires in a single pulling movement and pull the binding hook out of the loop. The end of the twisted rod 1 can be seen at the top, which is connected to a housing 3 via a rivet 2. With the previously known devices, the twisted rod simply merges into the binding hook. In the embodiment according to the invention, however, the binding hook 4 is connected in an articulated manner to the lower part of the housing 3 via an axis 5, as can be seen in particular from FIG. 4. As shown in Fig. 4, the binding hook 4 is formed in two parts, with both legs 4a and 4b at the front, i.e. at the hook end 4c, bent and riveted at the back.

On its side facing the twisted rod, opposite the end of the hook, the legs 4a and 4b of the binding hook each have an indentation 6 into which a locking slide 7 engages. 3, this locking slide is T-shaped and is pressed into the indentations 6 by a compression spring 8. At this end, the compression spring 8 is supported on a guide disk 9 which rests on the short legs of the locking slide. The compression spring 8 is guided with the leg of the locking slide 7 running therein in a bore 12 of a guide piece 10 and is supported there at its other end. The guide piece 10 is fastened in the housing 3, see FIG. 2. The lower edges 11 of the locking slide, which engage in the indentations 6, are only slightly broken in order to ensure a good locking.

The locking slide 7 acts not only on the binding hook 4, but also on a pawl 13 which is rotatably arranged around a pin 14 and within the two legs 4a and 4b of the binding hook. If the pawl 13 is now moved upward around the pin 14, i.e. in the direction of the knurled rod, the locking slide 7 is moved upward against the pressure of the spring 8 in order to release the binding hook which can be pivoted about axis 5.

This release process is shown in FIGS. 5 to 7 using three different phases. In these figures, the two reinforcing bars 15 and 16 to be connected and the wires to be twisted are shown in the phase in which the binding hook and the pawl engage in the upper end of the shaped wire part. 8, wire brackets according to PCT-A-WO87 / 01753 mentioned at the beginning, as will be explained further below, or still other wire shaped parts. The twisting of the wires or the rotation of the twisted rod is caused by a handle 20, which is only indicated symbolically here and has a continuous opening which is adapted to the cross section of the twisted rod. As a result of the twisting, the pawl 13 is pressed upwards in order to then reach an approximately congruent position with the binding hook 4. In the position of FIG. 6, the cam part 21 of the pawl 13 has lifted the locking slide 7 out of the indentations 6, so that when it is pulled further, i. 7, release the binding hook and the pawl and, when moving on to the FIG. 7 position, the hook and the pawl slip out of the upper part of the molded wire part. In this position, the locking slide 7 now presses on the rear end 22 of the binding hook and brings this and the pawl 13 back into the starting position according to FIG. 5.

This automatic release of the binding hook ensures that the wire parts are always be tightened equally and, on the other hand, above all that tearing them is made impossible by pulling them too hard and too long. As already mentioned at the beginning, such an automatic detachment of the wire brackets is particularly advantageous if a method and device for connecting at least two rods is selected in accordance with PCT-A-WO87 / 01753, because there the method and the device enable particularly fast Work even by non-specialized people and in addition the handle part of the device is designed there so that a relatively large amount of force is exerted on the twisted rod, which can lead to the risk of the wires breaking, which is avoided with the present invention. In addition, the wire brackets described there are particularly suitable for pulling up the pawl and releasing the binding hook.

However, the present invention is suitable not only for this method and device for connecting at least two rods, but also for any device for twisting wires. There are places on a building where a simple conventional twisting device can be advantageous and the lower end of the twisting device according to the invention is also suitable for such a device.

For such a simple device, the wire-shaped parts 18 with the eyelets 19 according to FIG. 9 are known, two of which are generally used at a time in order to achieve the desired strength. In order to simplify the production - four welding points, since two molded parts 18 have to be used - and the application, in which two molded parts have to be used at one time, the single wire loop 17 according to FIG. 8 was created, which only has one welding point 23 and of which only one must be used at a time. The double U-shaped bending and one-time welding of the wire loop 17 requires less complex tools and significantly less wire, which means the production costs can be reduced again. In order to adapt the device to different wire molded parts and wire types and sizes, it can be advantageous to either replace the compression spring or to adjust its tension.

The use and training of twisting devices is not limited to the construction industry. In the packaging industry or in viticulture, twisting devices are also used, which can be equipped with the trigger mechanism described above.

Claims (6)

1. A device for twisting wires, comprising a knurled rod (1) which is rotated by pulling a handle part and is provided with a binding hook (4) for seizing a wire loop, characterized in that said binding hook (4) is hinged on an axle (5) which is disposed perpendicularly with respect to said knurled rod (1), and is held in its normal position by locking means (6,7,8), and that said locking means are capable of being unlocked by a catch (13) which is actuatable by the contraction of said wire loop.
2. A device according to claim 1, characterized in that said binding hook (4) is formed of two parts and consists of two legs (4a, 4b) which are bent at the hook end (4c) and are provided on the side facing said twisted rod, opposite the hook end, with a respective recess (6) in which a T-shaped stop slider (7) under spring (8) pressure engages, said stop slider being capable of being unlocked by said catch (13).
3. A device according to claim 1 or 2, characterized in that the rear sides (21,22) of the binding hook and of the catch, opposite the hook end (4c), have such a shape that both parts are returned to their initial positions under the action of said stop slider after the release of said binding hook.
4. A device according to any one of claims 1 to 3, characterized in that the pressure spring (8) is supported by a guide washer (9) resting on the short legs of said stop slider, on one hand, and in a bore (12) of a guiding piece (10), on the other.
5. A device according to any one of claims 1 to 4, characterized in that said guiding piece (10) is disposed in a housing (3) to one end of which said knurled rod (1) is secured and to the other end of which said binding hook and said catch are secured.
6. A device according to any one of claims 1 to 5, characterized in that said movable handle part is formed so as to advance a wire clamp and is provided with closing jaws which are adapted to bring locking means of said wire clamp into engagement beneath the rods (15,16) to be connected.

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