DE29614300U1 - Hook for fastening a holding device that is subject to tension - Google Patents

Description

W. Schlafhorst AG & Co.

Blumenberger Strasse 143-145 -<

D-41061 Mönchengladbach 'i &idigr;'*~; V*i \l· ;*V.II

Date: 14.08.1996 WS 1928

Description

Hook for fastening a holding device subject to tensile stress

The invention relates to a hook for fastening a holding means subject to tensile stress according to the preamble of the first claim.

When securing objects, especially during transport, in addition to chains and ropes, special belts are used. At the ends of these, hooks are arranged that are hooked into lashing eyes or other fastening elements. Belts or ropes can also be used, for example, to stretch nets. For this purpose, the belts or ropes are connected to the outer edges of the nets. Using several hooks distributed around the circumference of the net, attached to the ropes or belts and hooked into fastening devices, a net can be stretched over these objects to secure them. It is also possible to stretch a net vertically in means of transport, for example in the trunk of a car, in order to prevent uncontrolled movements of the load, especially during braking maneuvers.

As a rule, these holding devices are under tension in order to fix the objects to be secured. The hooks that are attached are therefore usually under constant tension. The hooks can be simple wire hooks, flat hooks or snap hooks. Wire hooks or flat hooks are simple to construct and use. They only grip the fastening element, an eyelet or a rod, over half the circumference. If the holding device is suddenly relieved, they can therefore unhook and render the holding device inoperable. Snap hooks are therefore used to prevent the device from coming loose. Due to the spring lock, these are much more expensive than simple

Date: 14.08.1996 WS 1928

Hook. In addition, depending on the size of the hook, a corresponding amount of force is required to operate the spring lock. Furthermore, the operation of the spring lock can be made more difficult by insufficient accessibility.

The object of the present invention is to provide an easily manufactured hook for fastening a holding means subject to tensile stress, which cannot automatically detach itself from its fastening element when the holding means is relieved of tension.

The problem is solved with the help of the characterizing features of claim 1.

The inventive design of the hook reliably prevents it from coming loose from the fastening element, i.e. it from unhooking from an eyelet or from a straight, rod-shaped fastening element. Due to the helical design of the hook, the fastening element is completely surrounded by the curved part of the hook. If the hook is relieved of pressure, it cannot unhook because the end of the curved part of the hook extends to the side of the hook shaft and thus prevents unhooking. The hook shaft is the part of the hook that is connected to the curved part.

Despite the hook being secured against coming loose from the fastening element, it is easy to remove the hook from the fastening element without any tools. The hook end is at such a distance from the hook shaft that the fastening element can be passed through without a clamping effect. By slightly turning the hook towards the hook end, supported by a movement in the opposite direction to the pulling direction of the holding device, the hook pivots around its longitudinal axis and slides over the

..· HRTVDrSa/L Date: 14.08.1996 WS 1928

Fastener so that it passes between the hook end and the hook shaft. This releases the hook.

Hooking in is just as easy. The hook only needs to be pivoted towards its hook end in such a way that the fastening element can pass between the hook end and the hook shaft. Due to the helical design of the hook, the hook is automatically brought into a non-pivoted position when pulled into the fastening position, where it then completely encloses the holding means. The pivot axis of the hook is also its longitudinal axis and runs essentially perpendicular to the axis of the fastening element at the fastening point on the fastening element, the point of contact of the curved hook part on the fastening element when the hook is under tension.

The hook can be easily removed or attached if the helically bent hook part is dimensioned so that it grips the fastening element with some play.

In a further embodiment of the invention, the hook shaft is cranked. The cranking is selected so that the fastening point is on the hook's longitudinal axis, which runs through the fastening part for the holding means. The cranking means that the holding means, for example a belt, runs in the extension of the hook's longitudinal axis. This advantageously prevents additional bending forces from acting on the hook.

The shape of the hook according to the invention is possible both with simple wire hooks, which consist for example of a round, bent wire, or with flat hooks, which are punched and bent from a flat piece of sheet metal.

Date: 14.08.1996 WS 1928

The invention is explained in more detail using exemplary embodiments.

Show it:

Fig. 1 is a plan view of a flat hook according to the invention, which encompasses a rod-shaped fastening element,

Fig. 2 is a side view of the hook according to Fig. 1,

Fig. 3 a view of the flat hook according to Fig. 1 in the direction of the fastening eyelet of the belt,

Fig. 4 the flat hook according to the invention in the position in which either loosening or fastening is possible, and

Fig. 5 shows a hook made of round material in the form according to the invention.

In Fig. 1, a hook according to the invention is shown as a flat hook with 1. In the present example, a flat belt 2 is attached to the fastening part for the holding means of the hook 1, here an eyelet 6, as a holding means. The hook part 3, which encloses the fastening element 4, in this case a rod, is bent in a helical shape so that the hook end 5 extends to next to the hook shaft 7, the non-bent part 7 of the hook 1. In the present embodiment, the hook end 5 is essentially perpendicular to the hook shaft. The shape of the bent hook part 3 and the position of the hook end 5 can be seen in particular from the side view in Fig. 2 and the front view in Fig. 3.

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Date: f4.08.1996 WS 1928

As can also be seen from Fig. 2, the helically bent hook part 3 is dimensioned so that it engages the fastening element 4 with play. Furthermore, the distance 8 between the hook shaft 7 of the hook 1 and the hook end 5 is matched to the cross-section 9 of the fastening element so that the fastening element can be guided through without a clamping effect. The fastening element 4 is completely enclosed by the bent hook part 3, so that if the belt 2 is suddenly relieved of the tensile forces acting in the direction of arrow 17 and a movement caused by the relief in the direction of arrow 16, no automatic release of the hook from the fastening element 4 is possible.

A release from the fastening element 4 is only possible if, as shown in Fig. 4, the hook 1 is pivoted about its longitudinal axis 10 in the direction of its hook end 5, i.e. in the direction of the arrow 11. The longitudinal axis 10 of the hook 1 loaded by tensile forces runs essentially perpendicularly, i.e. essentially at a right angle 14, to the axis 15 of the fastening element 4 at the fastening point 13, where the helically bent hook part 3 rests against the fastening element 4.

In addition to the rotational movement, the release from the fastening element 4 is supported by a slight pushing movement in the direction of arrow 16, against the tensile load. The pitch of the helically bent hook part 3 is selected so that the slight rotating movement of the hook 1 causes the fastening element 4 to finally reach between the hook end 5 and the shaft 7. By pushing the hook slightly further in the direction of arrow 16, the hook is completely released from the fastening element 4 and can be lifted off of it.

Attaching the hook is done in reverse order of the steps described for the release process. The hook is placed in

\. HBrAQT-Sa / L Date: 14.08.1996 WS 1928

a position pivoted about its longitudinal axis 10 in the direction of the hook end 5 with its shaft 7, the non-bent part, placed on the fastening element 4 and moved in the direction of the arrow 17, i.e. in the direction of the tensile forces acting on the fastened hook. The fastening element 4 thereby slides through between the hook end 5 and the shaft 7 of the hook. With a pivoting movement opposite to the direction of the arrow 11, the hook 1 rests against the fastening element 4 and grips it with its helically bent hook part 3.

The present embodiment of the hook 1 shows a bend 18 in the shaft 7, the non-bent part of the hook. The bend 18 is selected so that the tensile forces acting in the direction of arrow 17 are introduced into the eyelet 6 in the direction of the longitudinal axis 10 of the hook 1 running through the eyelet 6. This aligns the holding means, the strap 2, in the direction of the longitudinal axis 10 of the hook 1. Under tensile load, the longitudinal axis 10 of the hook 1 runs perpendicularly to the axis 15 of the fastening element 4 through the fastening point 13, at which the bent part 3 of the hook 1 rests on the fastening element 4. The bend 18 prevents additional bending forces from acting on the hook 1.

Fig. 5 shows an embodiment of a hook made of round material. It offers the same advantages in terms of preventing spontaneous release from a fastening element as a flat hook.

Claims (4)

& Co. 'ßlumenberger Straße 143-145 .,-7-.. ., »&ldquor; »» D-41061 Mönchengladbactt *· · j ; ;·&ldquor;&diams;.;;#i> .:. .,*' \»·\.* Hßrmr.sa/L Date: 14.08.1996 WS 1928 Sayings 1. Hook for fastening a holding means subject to tensile stress, in particular a belt for securing objects, whereby the curved hook part can engage around a rod- or eyelet-shaped fastening element and the holding means is fastened at a distance from the curved hook part, characterized, that the hook part encompassing the fastening element (4) (3) is bent in a helical manner so that the hook end (5) extends to the side of the hook shaft (7) of the hook (1), so that the fastening element (4) is completely encompassed and that there is a distance (8) between the hook end (5) and the hook shaft (7) of the hook (1), which is smaller than the cross section (9) of the fastening element (4) is selected such that the fastening element (4) can be guided between the hook end (5) and the hook shaft (7) of the hook (1) without a clamping effect. 2. Hook according to claim 1, characterized in that the helically bent hook part (3) is dimensioned so that it grips the fastening element (4) with play. 3. Hook according to claim 1 or 2, characterized in that the hook (1) is a flat hook. 4. Hook according to one of claims 1 to 3, characterized in that the shaft (7) of the hook (1) has a bending (18) whose extent is selected such that the contact point (13) of the bent hook part (3) on the fastening element (4) when the hook (1) is under tension on the axis defined by the fastening part (6) -8th- HPT/Dr.Sa/L Date: 14.08.1996 WS 1928 for the holding means (2) extending longitudinal axis (10) of the hook (1).