DE20306385U1 - Spring clip is made from one piece of wire bent into shape and incorporating coil springs - Google Patents

Abstract

A spring clip is made from one piece of wire and incorporating a coil spring. One side of the spring is connected to a looped hook shape while the other side is bent into a joint and into a hooked closure of the clip. No other components are required. The looped hook is formed by a lower straight section and an upper loop with the return taken back with the free end located into the end of the coil. The upper section has a simple coiled joint and a hooked free end which locates inside the other looped end.

Description

MERGL, Matthias

Hook closure
5

Description

The present invention relates to a hook fastener.

Fasteners for hanging in rings, loops, eyelets and the like have been known for a long time. Nevertheless, there have always been suggestions for improving such fasteners. DE-U-88 06 053, for example, shows an improved snap hook. A hook for key rings or chains made of a spring steel wire is known from DE-U-77 06 016. Variants of safety pins are disclosed in DE-A-25 54 509, DE-A-27 35 998 or DE-A-23 18 734.

The object of the present invention is to enrich this technical field with a novel hook fastener which is very stable, can be hooked onto objects of different thicknesses and can also accommodate rods or the like.

This object is achieved with the features mentioned in claim 1. Advantageous embodiments and further developments of the invention are included in the further claims.

According to the invention, a hook fastener consists of a bent spring wire in which two legs extend from a section wound into a spiral spring, one leg forming a loop in which the second leg rests under the force of the spiral spring, and the free end of the second leg is bent into a hook behind the contact point.

According to a preferred embodiment of the invention, a middle section is wound into a spiral spring from which an upper and a lower leg extend, the lower leg being curved upwards after a straight section, this first curvature lying essentially in a plane that is parallel to the plane of the spiral spring, the upward curvature being followed by a second, U-shaped curvature that lies in a plane that is perpendicular to the planes of the spiral spring and the first curvature, the U-shaped curvature being followed by a third curvature that is parallel to the first curvature, the third curvature being followed by a first end section of the spring steel wire that is wound around the straight section at its tip with at least two turns, the upper leg running out of the spiral spring with a straight section that opens at an acute angle to the straight section of the lower leg, and the force of the spiral spring rests in the U-shaped curvature of the lower leg, the upper leg being bent downwards after the contact point and ending in a hook which lies essentially between the first and third curvature of the lower leg and has essentially the same curvature, the hook being able to be guided between the first and third curvature of the lower leg by overcoming the force of the spiral spring. The first and second curvatures preferably describe a radius of 95° to 285°. The angle of the two straight sections of the legs to one another is preferably between 5 and 85°.

In the following, the invention is described in more detail with reference to a drawing.

Fig. 1 shows a perspective view of a hook fastener; 30

Fig. 2 is a schematic plan view of the hook closure of Fig. 1 in the closed position;

Fig. 3 is a schematic plan view of the hook closure of Fig. 1 in the open position.

Fig. 1 to 3 show a hook fastener made of a bent spring steel wire, the end points of which are marked A and B. A middle section is wound into a spiral spring 1, from which an upper and a lower leg 2, 3 extend, the lower leg 3 being curved upwards after a straight section, this first curve 4 lying essentially in a plane that is parallel to the plane of the spiral spring. The upward curve 4 is followed by a second, U-shaped curve 5, which lies in a plane that is perpendicular to the planes of the spiral spring and the first curve, the U-shaped curve being followed by a third curve 4', which lies parallel to the first curve. The third bend 4' is followed by a first end section of the spring steel wire, which is wound at its tip with at least two turns 7 around the straight section 3 and ends at one end point B. The upper leg 2 runs out of the spiral spring 1 with a straight section that opens at an acute angle to the straight section of the lower leg 3. The upper leg 2 rests under the force of the spiral spring 1 in the U-shaped bend 5 of the lower leg 3, the upper leg having a downward bend 8 after the contact point and running out in a hook 9 which lies essentially between the first and third bends 4, 4' of the lower leg and has essentially the same curvature. The hook opens into the other end point A of the spring steel wire. Fig. 3 shows how, by overcoming the force of the spiral spring 1, the hook 9 can be guided between the first and third bends 4, 4' of the lower leg 3 and basically offers two points of engagement or hooking for rings, loops, eyelets or rods, which on the one hand lie between the hook 9 and the lower leg 3 and on the other hand between the part of the upper leg 2 directed downwards after the bend 8 and the curved sections 4, 4' of the lower leg 3.

Claims (4)

1. Hook fastener made of a bent spring wire, in which two legs extend from a section wound into a spiral spring, one leg forming a loop in which the second leg rests under the force of the spiral spring, and the free end of the second leg is bent into a hook behind the contact point. 2. Hook fastener made of a bent spring steel wire according to claim 1, in which a middle section is wound into a spiral spring ( 1 ) from which an upper and a lower leg ( 2 , 3 ) extend, the lower leg being curved upwards after a straight section, this first curve ( 4 ) lying essentially in a plane that is parallel to the plane of the spiral spring, the upward curve being followed by a second, U-shaped curve ( 5 ) that lies in a plane that is perpendicular to the planes of the spiral spring and the first curve, the U-shaped curve being followed by a third curve ( 4 ') that is parallel to the first curve, the third curve being followed by a first end section of the spring steel wire that is wound at its tip with at least two turns ( 7 ) around the straight section, wherein the upper leg ( 2 ) extends from the spiral spring ( 1 ) with a straight section which opens at an acute angle to the straight section of the lower leg, and under the force of the spiral spring rests in the U-shaped curvature ( 5 ) of the lower leg, wherein the upper leg is bent downwards after the contact point, and extends in a hook ( 9 ) which lies substantially between the first and third curvatures ( 4 , 4 ') of the lower leg and has substantially the same curvature, and wherein by overcoming the force of the spiral spring the hook can be guided between the first and third curvatures of the lower leg. 3. Hook fastener according to claim 2, characterized in that the first and the second curvature describe a radius of 95° to 285°. 4. Hook fastener according to claim 2 or 3, characterized in that the angle of the two straight sections of the legs to each other is between 5 and 85°.