Key ring with compressible gap

This invention relates to a key ring, comprising a wire (2) arranged in at least two rounds (20,21,22) providing a resilient spiral (1), said spiral (1) having a first and a second end (23,24), wherein the first end (23) by means of inertial resiliency is forced to tightly contact a first surface (21 A) of a lower round (21) and the second end (24) is forced to tightly contact a second surface (20 B) of an upper round (20) wherein at least one end (23) is openable, by means of arranging a peak (3 A) providing a compressible gap (5) between said at least two rounds (20,21,22), wherein said wire (2) in at least one of the rounds, preferably all rounds, has a cross-section wherein the thickness (h) and width (w) is such that 2h<w<15h.

FIELD OF THE INVENTION

The present invention relates to a key ring, comprising a wire arranged in at least two rounds providing a resilient spiral, said spiral having a first and a second end, wherein the first end by means of inertial resiliency is forced to tightly contact a first surface of a lower round and the second end is forced to tightly contact a second surface of an upper round wherein at least one end is openable, by means of arranging a peak providing a compressible gap between said at least two rounds.

BACKGROUND INFORMATION

A key ring is a very well known and often used utility that plays an important part of the daily life to keep order of keys. To secure the keys most key rings are made relatively stiff and therefore hard to open, i.e. putting on a key may be rather cumbersome. Moreover, the stiffness may lead to nails breaking when attempting to open up a key ring. Accordingly there do exist disadvantage with this commonly used utility. Document WO2007/138459 discloses a solution attempting to solve the above problems. This known key ring comprises an open able ring, having a main portion, one or more intermediate portions and an end portion. The three parts are hinged to each other on a rotation axis perpendicular to the plane on which the ring lies. The second ends of the main portion and the end portion are equipped with removable mutual coupling means. All parts are each made with a succession of several plates piled up in a transversal direction and joined together through fixed coupling means. The ring described above has some drawbacks, e.g. the plates needs to be coupled to each other, in a relatively complex manner and the main, intermediate and end parts must be hinged to each other, which all require work and expenses.

From U.S. Pat. No. 2,292,563 there is known a key ring intended to be carried as a ring on a finger, for easily accessible storage of one key. This solution present some disadvantages, e.g. that one of the ends of the ring extends perpendicularly in relation to the spiral such that it protrudes, which may cause uncomfort and which also eliminates a key to pass over the ends.

From U.S. Pat. No. 1,462,205 there is known a key ring which will eliminate the customary thumb-nail method of attaching and detaching keys by having an oblique part and one end of the key ring is formed with a laterally projecting arc. This solution present some disadvantages, e.g. that it still needs some strength to get the key into the arc and the design is rather complex from a production perspective.

From U.S. Pat. No. 2,410,951 there is known a key ring which is opened by compressing a gap formed in the spiral, whereby both ends will pivot out to present opening where a key may be inserted. A disadvantage with this design is that both ends always will open up simultaneously, which is not needed and mostly not desired both because opening requires a relatively strong force and that the open end may catch onto something in an irritable or even damaging manner. Moreover, the design is relatively complex from a production perspective.

SUMMARY OF THE INVENTION

The object of the present invention is to minimize the problems mentioned above, which is achieved by means of a key ring according to claim1.

Thanks to the invention there is provided an elegant and cost-efficient design that solves the above mentioned problem in a surprisingly efficient way.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following detailed description, and the examples contained therein are provided for the purpose of describing and illustrating a certain embodiment of the invention only and are not intended to limit the scope of the invention in any way.

FIG. 1shows a plan view of a key ring1made from a wire2, twisted to form a spiral of at least two rounds20,21. In the figure there is presented one end24of the wire, which end24is forced to tightly contact an outwardly facing surface20B of an upper round20. The key ring1has an outer diameter D that is substantially larger than the width w of the wire2.

FIGS. 2 and 3show the key ring1in a side view and cross-section respectively. It is shown that the wire2is twisted as a spiral, nearly three rounds20,21,22, i.e. an upper round20, and two subsequent lower rounds21,22(in the following sometimes denoted intermediate round21and lowermost round22). The wire2has a bend3on its second round21whereby there is created a peak3A that gives rise to a relatively large gap5between the lower round22and the intermediate round21. The bend3is created by means of bending the wire2, in the intermediate round21, to form a kind of a wide U, seen from the side. A kind of mean angle α of the extension of each “leg” of the U-shaped bend is between 20-60 degrees in relation to a plane containing the upper round20, which forms a U-shaped gap4between the upper and the intermediate rounds20,21. The bend3extends about 60-100 degrees of the key ring's1circumference, which in turn will provide for the large gap5extending about 100-200 degrees of the key ring's circumference. Hence the design provides the advantage that merely one pivoting device/deformation is needed to obtain the large gap5.

According to the shown embodiment the wire2has a width w that is bigger than the height h whereby the wires cross section is rectangular. The dimension may preferably be such that 2h<w<15h, more preferred 3h<w<12h. In a prototype that has successfully been tested the dimensions are h=0.5 mm, w=3.1 mm. Thanks to this design aspect several advantages are gained, e.g. high comfort during use (no disturbing edges, large pressing surfaces, a feeling of softness, etc) and a “dynamic” mode of operation, as will be explained more in detail below. The wire2is made of a strong and flexible material, e.g. stainless steel. By means of inertial resiliency a first end23is forced to tightly contact a first surface21A of a lower round (here21), and a second end24is forced to tightly contact a second surface20B of the upper round. A lower surface22A of the lower round22may have a bulging part, a pressure device7that acts like a marker that identifies a point for compressing the key ring1to open up the first end23. This pressure device7may e.g. be integrated with the wire2.

FIG. 4shows the key ring1turned around, seen from underneath, presenting the first end23.

FIG. 5shows the cross-section along V-V inFIG. 4, clearly presenting that a limited portion, about 40-60 degrees of the lowermost round22is in contact (at least partly) with the outwardly facing surface of the intermediate round, from the peak3A to the end23. It also clearly shows that the bend3makes a U-shaped inter space4between the upper round20and the intermediate21round, which in turn create the large gap5.FIG. 6shows a side view of the key ring when a force F is applied from both sides around the gap5. Hence, when the gap5is compressed, e.g. by the fingers, the first end23opens up an insertion opening6for the key to be put into. Thereafter the key can be thread onto the key ring1in a traditional manner, i.e. along the rounds22,21,20until it leaves via the second end24to be secured within the key ring. Thanks to the design using a relatively thin and resilient/flexible material and a “soft” peak3, the pivot points a, b will move in dynamic manner during compression of the gap5. To start with (seeFIG. 2) the lower starting pivot point a1is positioned relatively close to the end23that opens up. During opening it moves along the peak3on the first surface21A of the intermediate round21. During pivoting the pivot point a moves from one side to reach an end position a2(seeFIG. 6) on the other side of the U of the peak3. In total the movement from a1to a2is about 5 to 20 degrees of the circumference of the spiral. The other starting pivot point b1is also positioned on the first surface21A of intermediate round21at a position that is about 180-270 degrees away from the peak3A. During opening, this second pivot point b moves along the intermediate round21to reach an end position b2(seeFIG. 6) within a sector on an opposite side of the key ring, compared to the starting point b1. In total the movement from b1to b2is more than 90 degrees approximately about 180 degrees. This dynamic movement of the pivot points facilitates opening of one end23only, thanks to the flexibility/resiliency achieved by the design. When the force is decreased the insertion opening6shuts tight again and the key is safely retained between the neighboring rounds21,22. Thereafter the key can be thread onto the key ring1in a traditional manner, i.e. along the rounds22,21,20until it leaves via the second end24to be secured within the key ring. Also when removing a key, the same principle is used, i.e. by compressing the gap5the chosen key may easily be inserted into the spiral and thereafter removed in a traditional manner. Thanks to the design any of a number of keys may easily be chosen for removal, since the total height H (seeFIG. 5) may easily be kept low enough to allow passing through the hole in a key handle/grip. Preferably the height H is about 3-6 mm, more preferred less than 5 mm, since the hole in a key handle/grip is normally 5-6 mm measured over the shortest distance. The width w of the wire2is also preferably smaller than the hole in the key handle/grip. In a preferred embodiment, the peak3is positioned such that the key ring1has a height of the large gap5that is approximately as high as twice the height of the U-shaped gap4. Hence, in order to keep the total height H below the desired maximum of 5-6 mm, it is a great advantage to use a wire2having a limited height h.

FIG. 7shows an alternative way of the key ring1where the intermediate round21is plane, in close contact with the upper round20. Instead of bending the wire2the peak3A is here created by a separate, solid body8that is attached to the first surface21A, e.g. by gluing, at the same place as the bend3described above. The body8has a convex upper surface, e.g. in the form of a semicircle that gives the same dynamic pivot points a, b as described above, during opening. The pressure device7described above may be in a form that it is squeezed onto the lower round22and is preferably bulging e.g. in the form of a droplet7, which acts like a comfortable pressure point, and makes it easy to find the right spot. The body8has a length L in the interval 5-15 mm, more preferably 8-12 mm.

FIG. 8shows a cross-section view along IIX-IIX inFIG. 7. It shows how the body8is in contact with the intermediate21and the lower22round and how the pressing device7is bulging from the surface22A. The body8is preferably casted in one piece and preferably with two edges8B,8C on the side that lies against the first side21A which allows squeezing the body8onto the intermediate round21. The body8may have a height H′ in the interval 1-7 mm, more preferably 2-4 mm.

FIG. 9shows the key ring seen from underneath. The edges8B,8C of the body8is also seen from underneath and shows how they extends a little bit outside the key ring1and there is also seen that the pressing device7is arranged onto the surface22A. The body8has a shape that follows the shape of the key ring when squeezed onto it. The body8extends about 60-100 degrees of the key ring's1circumference.

The invention is not delimited to the embodiment described above but can vary within the scope of the appended claims. For instance, the skilled person realizes that the peak3A may be achieved in different ways, but still providing the functionality as mentioned above, e.g. instead of an angled second round there can be arranged a solid U-shaped body, e.g. by means of soldering, on the wire. Further, the wire can be twisted a variety of rounds, e.g. two or more than three rounds and yet fulfill the same basic function. Moreover, the cross section of the wire2can vary, (e.g. be circular and/or a partly flattened (i.e. substantially rectangular) wire) and also the material may vary, (e.g. a polymer, or a composite) and still fulfill the same basic function. It is also understood that with a more stiff material the wire may be thinner than the suggested intervals. The body8is preferably made of a polymer but may of course be made in other materials and still fulfill its purpose. The pressure device7may be arranged in other ways than described above e.g. by a roughened sticker or be excluded. Further it is evident that in the preferred embodiment the second opening24, does not open up at all, but that within the scope of the claims it is to be understood that a design enabling a small opening (e.g. of about 25% of the insertion opening) is also to be seen as encompassing the invention.