Fastener

Abstract: A fastener comprised of a base (3) having tongue-shaped strips (2), an adhesive layer (8) attached to the base (3) and covered with a detachable sheet (7) or at least one synthetic resin sheet. To utilize the fastener, the detachable sheet (7) is stripped from the adhesive layer (8), or the synthetic resin sheet is melted, securing the base (3) to the attaching surface of a file etc. by the bonding force of the adhesive layer (8) or by the heat-welding of the synthetic resin sheet. In alternate embodiment the base (3) and tongue-shaped strips (2) are encapsulated between two synthetic sheets (9A,9B) with the adhesive surface (8) being on one of the sheets (9A,9B). Detachable release sheet (7) is applied to the adhesive layer (8) until ready for use.

Description: BACKGROUND OF THE INVENTION The Invention is related to a fastener adapted to be secured to an attaching surface for binding sheets etc. to a file, the fastener cooparating with a holder having holes on each end, clamping sliders are mounted on the holder, the fastener further comprising an adhesive layer and a base having tongue-shaped strips, the tongue-shaped strips being adapted to pass through holes punched in the sheets etc. for storing the sheeds in said file, and through the holes in the holder to securely clamp down the sheets by the sliders. Fasteners of this type are shown in GB 2 191 734 and form the basis for the preamble of claim 1. In conventional files, fasteners have a base with tongue-shaped strips secured to the surface of a cover of the files by a stopper. The tongue-shaped strips pass through holes of sheets etc., such as loose leaf piper and in turn through holes of a holder. The strips are held down by sliders which slidibly mounted in the holder and result in the sheets being bound. Another type of file has a folded portion at a boundary between a cover and a backbone of the files. On the folded portion a base with tongue-shaped strips is secured. However, files of the former type, since the base or stopper is exposed outside of the cover, it does aesthetic harm to the files. Also since some files need holes so that the tongue-shaped strips can pass through them, manufacturing then takes a lot of time and steps, and costs are entailed. In files with folded portion of the latter type, since the base or stopper is not exposed outside of the cover, it looks better than the former type of files. However, they need the folded portion and stopper for the base. Also some files need holes so that the tongue-shaped strips can pass through them. As a result manufacturing then takes a lot of time and steps, and costs are entailed. SUMMARY OF THE INVENTION Accordingly, it is an object of the invention to provide a fastener which is easily adapted to be secured to the surface of a file or wall for binding sheets etc. so as to overcome the disadvantages of known art. The fastener according to the invention is characterised by a pair of synthetic resin sheets which are bonded to each other to enclose or encapsulate the base on either side thereof with the tongue-shaped strips projecting from the base and the fastener further comprises an adhesive layer provided on one of the synthetic resin sheets and a detachable sheet covering one surface of the adhesive layer. A cutting line may be extended traverse on the central portion of the other synthetic resin sheet. Because the fastener according to the invention comprises an adhesive layer or synthetic resin, the base or the stopper is never exposed outside of the file. In addition, because the fastener does not require a folded portion of the file nor holes through which the tongue-shaped strips should pass, manufacturing is simple and cost is reduced. Other objects and advantages and novel features of the invention will become more apparent from the following portion of this specification and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig.1(A) is a front view of one embodiment of the fastener according to the invention, Fig.1(B) is a longitudinal sectional side view of another embodiment of the fastener according to the invention, Fig.2(A) is a front view of third embodiment of the fastener according to the invention. Fig.2(B) is a front view of fourth embodiment of the fastener according to the invention, Fig.3(A) is a longitudinal sectional side view of the fastener shown in Fig.2(A), and Fig.3(B) is a longitudinal sectional side view of the fastener shown in Fig.2(B). DESCRIPTION OF THE PREFERRED EMBODIMENTS Fig.1(A) shows a fastener in connection with a file, a sheet 4 and a holder 5. The fastener generally includes base 3 and synthetic resin sheet 9 attached to base 3. Base 3 has a pair of tongue-shaped strips 2,2 at either ends thereof which extend outward from beneath the synthetic resin sheet 9 through slits 11A,11A. Base 3 is disposed at a central position 1A of back surface 1 of the cover of a file along the backbone of the file. If the cover is made of synthetic resin, the attachment for base 3 to attaching surface 1 is made by heat-welding either edge 12A, 12A of synthetic resin sheet 9 with the tongue-shaped strips 2,2 projecting outwards from sheet 9 through slits 11A, 11A. Holder 5, which can be made of synthetic resin or metal, has a pair of holes and a pair of sliders 6, 6 slidably mounted on holder 5. Sliders 6,6 can be also made of synthetic resin or metal. The holder 5 and sliders 6,6 used may be those known in the art. When binding loose leaf pad 4, tongue-shaped strips 2, 2 pass through punched holes of loose leaf pad 4 and in turn through holes of holder 5. Then sliders 6 are moved away from each other in the directions denoted by the arrows in Fig.1(A) so as to hold down the tongue-shaped strips 2,2 respectively, resulting in loose leaf pad 4 being bound. In Fig. 1(B), a fastener generally includes base 3 having a pair of tongue-shaped strips 2,2 at either ends thereof, adhesive layer 8 and detachable sheet 7 covering one surface of adhesive layer 8. When the cover is made of paper, it is effective to utilize this type of a fastener. Detachable release sheet 7 is stripped from adhesive layer 8 so that the fastener can be secured on attaching surface 1 by the bonding force of adhesive layer 8. The fastener of Fig.1(B) is also used when the cover is made of synthetic resin. Figs. 2(A) and 2(B) show other embodiments of the fastener according to the invention, and Figs. 3(A) and 3(B) are longitudinal sectional side views corresponding to Figs. 2(A) and 2(B) respectively. In these embodiments, synthetic resin sheets 9A, 9B are bonded to each other by radio-frequency welding at the edges to enclose base 3 on either side thereof with tongue-shaped strips 2,2 projecting from inside defined by sheets 9A, 9B through slit 11A, 11A. If base 3 is made of metal, synthetic resin sheet 9A on the front side of the base 3 is preferably made of two parts. Before bonding sheet 9A with sheet 9B by radio-frequency welding, each end of a two-part synthetic resin sheet 9A can easily pass over each tongue-shaped strip 2,2. In other words, each end of a two-part synthetic resin sheet 9A can be introduced from either side of the base 3 without bending base 3 which has less flexibility. Therefore after bonding, cutting line 10 dividing the two parts which extends traverse on the central portion of synthetic resin sheet 9A remains as a boundary of the two parts. On the back side of base 3, adhesive layer 8 with detachable sheet 7 is provided on synthetic resin sheet 9B. The fastener can be secured at the central position 1A of the back of a cover attaching surface 1 of a file along the backbone of the file by adhesive layer 8 after stripping detachable release sheet 7 therefrom. The embodiments of Figs. 2(A) and 2(B) can be applied to a cover made of either paper or synthetic resin. If base 3 having tongue-shaped strips 2,2 is made of synthetic resin, synthetic resin sheet 9A can be made of one piece. Because base 3 itself is flexible and each tongue-shaped strip 2,2 can pass through the holes of synthetic resin sheet 9A easily. Therefore, there is no need for dividing cutting line 10 on synthetic resin sheet 9A. While the principles of the invention have been described above in connection with specific embodiments, and particular modifications thereof, it is to be clearly understood that this description is made only by way of example and not as a limitation on the scope of invention but only in accordance with the scope of the appended claims.

Claims: A fastener adapted to be secured to an attaching surface (1) for binding sheets (4) etc. to a file, the fastener cooperating with a holder (5) having holes on each end, clamping sliders (6) are mounted on the holder (5), the fastener further comprising an adhesive layer (8) and a base (3) having tongue-shaped strips (2), the tongue-shaped strips (2) being adapted to pass through holes punched in the sheets (4) etc. for storing the sheets in said file, and through the holes in the holder (5) to securely clamp down the sheets by the sliders (6), characterized in that the fastener comprises a pair of synthetic resin sheets (9A,9B) bonded to each other along the edges thereof to encapsulate the base (3) with the tongue-shaped strips (2) projecting from said base (3), and wherein the adhesive layer (8) is provided on one of the synthetic resin sheets (9B). A fastener according to claim 1, characterized in that the other synthetic resin sheet (9A) is divided into two parts by a cutting (10) traversing the sheet (9A) on the central portion.

Inventors: NOGUCHI KANJI, NOGUCHI, KANJI
Applicants: SHILOGANE KASEI CO LTD, SHILOGANE KASEI CO., LTD.
Application year: 1993
Main classification: B42F13
IPC codes: B42F13