Fastener with removable head

Abstract: A bar 3 is provided on one extremity of an elongated filament part 2, a head 4 is provide on the other extremity of the filament part 2 and, at the same time, a removing portion 6 is provided between this head 4 and the filament part 2, and it is so composed that the head 4 and the filament part 2 can be separated easily, and a fastener affixed to the product S can be removed by manual operation.

Description: Background of the invention: The present invention relates to a fastener with a removable head comprising an elongated filament part having a bar formed at one extremity and the removable head at the other extremity thereof, the bar forming a T-letter shape with the elongated filament part. This fastener preferably is integrally made of synthetic resin such as nylon or propylene, and is suitable for binding a plurality of or a plurality of pairs of products including particularly towels or socks. For example, fasteners made of synthetic resin are normally used to attach a price tag or a label to a product, or to bind a plurality of or a plurality of pairs of towels or socks. And, as for a fastener used mainly for attaching a price tag, called "tag pin", an assembly of fasteners is molded integrally with molecular oriented thermoplastic synthetic resin such as nylon, by forming a bar in T at one extremity of an elongated filament part, by forming the whole in H by providing a flat head at the other extremity, and in a state where 50 to 150 fasteners are planted on a linkage rod (member corresponding to a backbone) by means of an intermediate or a linkage portion disposed at the center of the bar, and moreover, the filament part is made thinner and more tough by extending by a predetermined factor. Recently, a plurality of towels, socks or other textile products are sold lumped together and, for this effect, a method has became adapted for binding a plurality of or a plurality of pairs of towels or other textile products, by shortening the filament part of fastener for attaching the price tag than the one for attaching the price tag. For attaching such fastener to a textile product or the like, an assembly of fastener is charged in a pistol type applicator device, a hollow needle fitted to the tip of this applicator device is penetrated into a plurality of or a plurality of pairs of piled up towels, socks or other textile products and, then, the bar of a single fastener is fixed at the back of the textile product by pushing it out of the hollow needle tip by gripping a lever protruding in front of a grip portion, and the bar pushed out from the hollow needle restores its original form by the spring stress of a junction portion with the filament part, namely, so that the bar will be directed forming a T-form in respect of the filament part and fixed to the back side of socks or towels. As described above, when textile products are bundled, as the fastener penetrates into compressed textile products, its head and bar will be fixed eating into both faces of such textile products. The fastener used for attaching the price tag has a relatively long filament part between the product and its head, and the price tag is supported loosely in respect of the filament part, so it is necessary to cut the filament part with scissors or a knife to cut off the price tag from the product for removing the fastener. On the other hand, as mentioned above, if a plurality of towels or other compressible textile products are bundled in a condition tighten by driving a fastener into them, its head and bar bite into both faces of the textile products leaving no room for operating scissors or a knife if one wants to cut the fastener. Also, it is difficult to tear off the head by stress, because it leaves little portion to grasp by hand. In other word, as the filament part is made as strong as a silken gut by extension, it can only be broken by a tensile strength of equal or superior to 10 kg, giving damages to the textile product. Thus, if soft towels, socks or other textile products are bundled using a fastener with a short filament part, its head and bar positioned on the face and back of such bundle will bite into the towel surface and be buried therein. This small bar (0,8 mm in diameter, 9 mm in length) can not possibly be held by finger tips and, moreover, even its head having an area relatively larger than said bar can hardly be pinched with finger tips and, it can not be torn off by hands, Therefore, the tip of scissors or a knife can not reach at the filament part of a fastener buried in the textile product and, if one tries to cut by stress the filament part with scissors penetrated into the textile product, fibers of towels or other the textile products may be cut out. On the other hand, conventionally, an idea of fastener of attaching the price tag has been proposed to leave a non extended portion on a portion of the head side on the filament part and to dispose a small diameter cutting portion on this non extended portion; however, the non extended portion presents a far less strength in comparison with the filament part made thinner and stronger by the extension, bends easily deteriorating the physical aspect, so it can not really be applied to the price tag attachment. US-A-5,463,799 disclosed a similar fastener with a removable head comprising an elongated filament part having a bar formed at one extremity and the removable head at the other extremity thereof, the bar forming a T-letter shape with the elongated filament part. In order to remove the head there is a weakened portion in the elongated filament part called intermediate portion. When this portion is stretched, the filament portion is susceptible to breakage, so that it is impossible to stretch the filament portion sufficiently to attain a high strength. Summery of the invention: The present invention is devised in consideration of shortcomings of said conventional fastener and has an object to provide a fastener presenting a necessary strength for fixing the product so that the filament part will not break even when a tensile stress is applied to the filament part, wherein the fastener or a part thereof can be removed or pulled off from the product to separate simply this product. To overcome the shortcomings of the conventional fastener, and to solve the object, the invention is characterised in that the head is formed at an edge portion joined to the filament part with a junction portion comprising a breaking portion having a locally weak portion such that when a stress equal or superior to a predetermined stress is applied to the head, it will become broken. In contrast to the prior art fastener, the fastener of the invention has the breaking portion provided at the head. Because there is no weakened portion provided in the filament part, the filament part with great advance can be stretched through a stretching step sufficiently, whereby it is possible to obtain a very strong filament part. Thus, if the fastener of the invention is subjected to an application of a tension within a certain limit during handling of merchandise to which the fastener was applied, it is not likely that the filament part undergoes undesirable elongation. In the present invention the breaking portion is formed in an edge portion of the head so that a segment of the head will remain to be present on the side of the filament part when the head is severed at the breaking portion. This part is only in the form of a thin or fine body that can easily undergo deformation and easily pass through merchandise when the filament part is pulled out of the merchandise. Thus, it is unlikely that the merchandise becomes impaired when the fastener is removed away the merchandise. This breaking portion can be formed by perforating a hole at the head side of the junction portion between the filament part and the head so that the breaking starts from this hole portion. According to a preferred embodiment of the invention, the breaking portion is straight or arcuate in shape or V-shaped. Furthermore, it is advantageous according to the invention, if the breaking portion is formed with a through hole. However, in the fastener of this structure, supposing that it is necessary to improve the strength by elongating the filament part, it is required to adopt such a structure that can bear the stress to elongate this filament part at the head side. Brief Description of Drawings: Fig. 1 is a front view showing an example of the fastener according to the present invention; Fig. 2 is a side view of the fastener of Fig. 1; Fig. 3 is an enlarged side view of the essential parts of the fastener of Fig. 1; Fig. 4 illustrates the function of the fastener of Fig. 1; Fig. 5 is an enlarged front view of the essential parts of a variation of the breaking portion; Fig. 6 is an enlarged front view of the essential parts of a variation of the breaking portion; Fig. 7 is an enlarged front view of the essential parts of a variation of the breaking portion; Fig. 8 is a front view of the fastener of another configuration; Fig. 9 is a front view of the fastener of another configuration; Fig. 10 is a front view of the fastener of another configuration. Description of the preferred Embodiment: Now the embodiment of the present invention will be described referring to the drawings. As shown in Fig. 1, a fastener is molded with synthetic resin integrally as an assembly of fasteners including the portion indicated by two-dot long and two short dashes lines and, this fastener 1 is composed of a filament part 2, a bar 3 provided at one extremity of the filament part 2 and a flat head 4 disposed at the other extremity of the filament part. For example, 50 to 150 or more fasteners 1 are formed implanted as a comb on a link rod 11 by intermediate of a linkage portion 10 indicated by two-dot long and two short dashes lines to said bar 3. Synthetic resins to be used include polypropylene, nylon or other molecular oriented thermoplastic resins and, they can be colored with a desired color by blending the synthetic resin with pigments before molding, according to the application of this fastener 1. This fastener 1 is manufactured by "intra-dice elongation method" and, after the integral molding as an assembly as shown in Fig. 1 in dice, the filament part 2 is elongated by about 3 to 5 times evenly and substantially over the total length by displacing one die in respect of the other from a parting fact PL1 orthogonal to the filament part. Then, a parting face PL2 (joining face of the upper and the lower dice) orthogonal to said parting face PL1 is opened to take out the assembly of fasteners 1 from the dice. After such elongation, the filament part 2 is smaller in diameter and stronger than the non-elongated filament part 2' indicated by two-dot long and two short dashes lines as silken gut and presents such a strength that it can no more be torn off easily by hands. During the elongation operation of this filament part 2, a stress is to be applied to a junction portion 5 formed at the edge of the bar 3 and the head 4. Moreover, as for this filament part 2, the strength of a root portion 2A with the bar 3 and the filament part 2 is improved by said elongation operation and, the bar 3 pushed out from the hollow needle at the tip of a not shown applicator restores the original configuration by the spring stress of the filament part, namely, so that it will be directed orthogonal in T to the filament part 2. Note that the bar 3 is formed to present a diameter substantially equivalent to the diameter of the non-elongated filament part 2'. On the other hand, the head 4 is formed in flat plate form itself, with edge portions 4A of the filament part 2 side reduced to an arc form. And, between these two edge portions 4 A, A junction portion 5 narrower that the width of the head 4 is formed and, additionally, a breaking portion 6 applied in the present invention is provided in the direction transversal to this junction portion 5. (Breaking portion). As shown in Fig. 2 this breaking portion 6 is formed by a pair of surface and back transversal grooves in V or in neck-form disposed in opposition the one the other on the both surface and back face of the junction portion 5. Its thickness, namely the distance t1 between the bottom of a pair of opposed breaking portions 6, 6 is formed thin of about 1/3 the plate thickness t2 of the head 4 as shown in Fig. 3. Therefore, this junction portion 5 can be separated easily from the head 4 by folding or twisting by intermediate of the breaking portion 6. Said breaking portion 6 forms a part of the head 4 and, as shown in Fig. 1, even if a stress F (tensile stress) to elongate the filament part 2 is applied to this head 4, it will not break because this breaking portion is engaged with and supported by the die. However, as shown in Fig. 2, this breaking portion 6 can easily be torn off, for example, by blocking with the tip of one hand (left hand for instance) the vicinity of the reduced junction portion 5 B which is a part of the junction portion 5 and folding the head 4 at the thin portion of the breaking portion 6 alternatively in the directions of the arrow a or b with the tip of the other hand (right for instance). As another breaking method, the entire breaking portion 6 can be broken and removed by pinching the reduced junction portion 5 B of the junction portion 5 with one finger tips and twisting the head 4 in the crossing direction in respect of this junction portion 5 B, namely, as shown by the arrow R in Fig. 1. Said breaking portion 6 of transversal groove presenting a V-form cross-portion is spaced by a predetermined distance L (Fig. 1, even if it is a slight distance) from a front end face 5 A of the junction portion 5 as shown in Fig. 1, and when this breaking portion 6 is broken and the head 4 is separated from the filament part 2 side, this junction portion 5 will constitute a piece or thick film form reduced junction portion 5 B which is smaller by the width of said distance L and remains in T at the extremity of the filament part 2 in parallel to the bar 3. As the consequence, this thin and reduced junction portion 5 B presents such a strength that allows to bend easily into V- or U-form the narrow junction portion 5 B remaining on the filament part 2 side as shown in Fig. 4 by applying a stress (preferable equal or superior to the product binding stress) to the same 5 B. Moreover, as mentioned above, the filament part 2 is connected to the head by intermediate of the junction portion 5; however, as the extremity of this filament part 2 is not elongated, as shown in Fig. 1, apparently, the junction portion 5 seems to eat into the extremity 2 A of this filament part 2. Consequently, in a state where the head 4 is removed from the junction portion 5, a stress G, G diving into to is applied to the towels, socks or other products S pinched between this head 4 and the bar 3, the junction portion 5 B reduced into a thin rod or film can be folded into V- or U-form and pulled off from a part of the products S and, further, by puling off thus deformed junction portion 5 B from these products S, the fastener can be extracted. For instance, if a bundle of bought socks is to be unbundled to wear them on, this breaking portion 6 can easily be torn off to remove the head 4, by pinching with the tip of one hand the filament part 2 and the junction portion 5, folding the breaking portion 6 by pinching and moving the head 4 alternatively in the directions of the arrow a and b with the tip of the other hand as shown in Fig. 2. Then, as shown in Fig. 4, if a plurality of socks S are divided by applying a stress as indicated by arrows G, G, this stress G will be applied to the reduced junction portion 5 B through the bar 3 and the filament part 2 in contact with the one sock S side and folded the junction portion 5 B into V, allowing to separate the bundle of socks S from the center. Next, the reduced junction portion 5 B can easily be removed by pinching the bar 3 remaining on the one bundle of socks S and pulling it off with the filament part 2 as indicated by the arrows C (Fig. 4) allowing to separate the socks individually. Here, the thin and reduced junction portion 5 B which is a part of the junction portion 5, remaining on the filament part 2 side after the head 4 removal may be folded more easily by making thinner the center of the junction portion 5 to which the filament part 2 is connected, assuring a more effective break. To be more specific, for example, a through hole 12 (round hole, oval hole) may be disposed at the center of the groove form breaking portion 6, namely, at the root of the filament part 2 as shown in Fig. 5, and the break may start easily form this junction portion by generating a local strain at this breaking portion 6 through this through hole 12 when a tensile stress is applied to the filament part 2. It will break still more easily by providing a slit 13 at the center of the elongated groove form breaking portion as shown in Fig. 6. Moreover, it will break more easily than the case shown in Fig. 5, by providing a V-form groove 14 (notch) at the center of the transversal groove of the breaking portion 6. The cross-portion of the breaking portion 6 is not limited to the V-form transversal groove, but also, for example U- or ⊃-form grooves may also be used. In short, the portion between the filament part 2 and the head 4 may be designed to deploy a sufficient resistance to bundle products S between the filament part 2 and the head 4, but enough weak to remove the head 4 easily when a stress superior to the resistance is applied to the head 4, or a stress bending the head 4 laterally, a stress twisting the head orthogonal to the filament part 2 or to a still larger angle, or a stress dividing the head 4 is applied so that the head 4 can be removed easily by holding this head 4 and applying the stress, and moreover, a part of the junction portion 5 remaining on the filament part 2 side can be folded easily and extracted from the products without damaging the products S. Said breaking portion 6 of transversal groove shape is preferably formed on both sides of the junction portion 5, but it can be provided only on one face, provided that it satisfies the aforementioned conditions. When the fastener piece is used ordinary, said junction portion does not break and can keep the state as formed in the elongation step of the filament part 2, but it presents a function to separate by intermediate of the breaking portion 6 when a stress folding or twisting the head 4 is applied to the filament 2; therefore, providing a junction portion 5 on the fastener piece is not different from the conventional fastener piece in no way from the functional point of view. Fig. 8 shows a fastener 1A according to another embodiment; in this example, a head 4A is formed in fan shape, and a junction portion 5A having a breaking portion 6A in V at the arc portion to which the filament part 2 is jointed. The fastener 1A of this type allows to form a long breaking portion 6A and to make the width of the junction portion 5A a narrow V form, and moreover, the elongation step can be facilitated because the stress during the filament part 2 elongation can be burdened sufficiently. On the other hand, this junction portion 5A can be separated easily from the head 1A hooking a nail to the end portion T of the junction portion 5A by facilitating its break by means of a notch provided at this end portion, or by other means. Fig. 9 shows a fastener 1B according to still another embodiment, wherein a half head 4B is formed, and a junction portion 5B and a breaking portion 6B are formed at the edge of this head 4B. As some of this shape may presents unstable parts in the head 4B, it may also be formed by extending a part or whole of the half head 4B into the portion omitted as necessary. In this case, the length of the junction portion 5B may be conveniently formed according to the length of the head 4B. In Fig. 10 a fastener 1C is composed to have a semi-circular head 4C, and in this fastener 1 C, an arc from junction portion 5C and an arc form breaking portion 6C are formed. Various designs are used for the head shape of the fastener according to the present invention for, otherwise, indicating the manufacturing maker, and a head among said various embodiments, or one that is deformed farther based on them may be used, and the junction portion and the breaking portion may appropriately be selected in conformity with this and applied. The fastener according to the present invention can provide the following effects: 1) As the filament part is deprived of a junction portion, the filament part would not break even if a predetermined tensile stress is applied to this filament part and, therefore, the filament elongation process can be performed as conventionally, and the fastener can be used following the conventional method. The head can be broken easily by folding, twisting or tearing by hand the breaking portion disposed on the head to remove the fastener from the product and, the head can be removed easily from the portion of the head connected to t he filament part. 2) A junction portion is disposed at the edge of the head facing the bar, and a small bar like one is formed facing the bar by breaking the head from this junction portion. This bar like one is weak enough not to damage the product, and it can be deformed easily when the breaking portion is cut off from the head by hand, and the filament part is pulled off with the bar, allowing to extract easily without damaging the product. 3) Moreover, in the fastener according to the present invention, as the breaking portion is formed in a transversal groove, the head can be separated easily to remove from the filament part through this breaking portion by folding or twisting the head, allowing to detach easily the fastener from the product by manual operation. 4) The head can be separated from the fastener and the fastener can easily be removed from the product by affording to the head a stress different from the binding stress, or a stress stronger than this binding stress or a stress that would detach the head from the product. 5) As the breaking portion is not interposed between the filament part and the head, but can be formed on the head, at the edge opposed to the bar portion, the breaking portion can be formed with various configurations, structures with various strength, which is also advantageous from the point of view of designing to indicate the source of the fastener.

Claims: A fastener (1) with a removable head (4, 4A, 4B, 4C) comprising an elongated filament part (2) having a bar (3) formed at one extremity and the removable head (4, 4A, 4B, 4C) at the other extremity thereof, the bar (3) forming a T-letter shape with the elongated filament part (2), characterised in that the head (4, 4A, 4B, 4C) is formed at an edge portion joined to the filament part (2) with a junction portion (5, 5A, 5B, 5C) comprising a breaking portion (6, 6A, 6B, 6C) having a locally weak portion such that when a stress equal or superior to a predetermined stress is applied to the head (4, 4A, 4B, 4C), it will become broken. The fastener with a removable head (4, 4A, 4B, 4C) of claim 1, characterised in that the breaking portion (6, 6A, 6C, 6C) is formed by reducing the thickness of the head (4, 4A, 4B, 4C) by forming a groove in the transverse direction of the head (4, 4A, 4B, 4C). The fastener with a removable head (4, 4A, 4B, 4C) of claim 1 or 2, characterised in that the breaking portion (6, 6A, 6B, 6V) has a strength which can resist a product binding force but can be broken by a stress stronger than the product binding force, applied by hand on the head, or when the head (4, 4A, 4B, 4C) is twisted. The fastener with a removable head (4, 4A, 4B, 4C) of anyone of claims 1 to 3, characterised in that the breaking portion (6, 6A, 6B, 6C) is straight or arcuate in shape or V-shaped. The fastener with the breaking portion (6, 6A, 6B, 6C) of anyone of claims 1 to 4, characterised in that the breaking portion (6, 6A, 6B, 6C) is formed with a through hole (12, 13) at the center of said breaking portion.

Inventors: HIROKI TOYOHISA, HIROKI,TOYOHISA, Hiroki,Toyohisa c/o Toska Co. Ltd.
Applicants: TOSKA CO LTD, TOSKA CO., LTD.
Application year: 1999
Main classification: B65C7
IPC codes: G09F3, B65C7