Abstract:
A slide fastener, wherein in the fastener chain openable and closable from both ends thereof, a box pin and the insert pin, which can join with or separate from each other, are provided at least on an end of the fastener chain; and a protrusion facing the insert pin and projecting from an opposing face is provided at a front end of the box pin; the protrusion has slopes inclined in a direction of approaching the insert pin on upper and lower sides of the protrusion; and the lower side of the protrusion makes contact with a diamond of the reverse opening slider, while the upper side of the protrusion can guide the insert pin smoothly when the pin is inserted.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a separable bottom end stop for a slide fastener. The separable bottom end stop is formed of a box pin and an insert pin, an upward opening slider and a reverse opening slider are loaded on a fastener chain, and the box pin and the insert pin are improved, thereby achieving a smooth separation and insertion of those pins.  
         [0003]     2. Description of the Related Art  
         [0004]     Conventionally, Japanese Patent Application Laid-Open No. 2002-136309 has disclosed a separable bottom end stop for a slide fastener, as shown in  FIG. 9 , in which an expanded portion  41 ′ which allows an insert pin  6 ′ to retreat is provided on an outer side face at a front end of a box pin  5 ′, and a projecting portion is provided on a rear face at a corner portion of the front end of the box pin in order to prevent a reverse opening slider  8 ′ from escaping, so that the projecting portion can make contact with and engage with a front end of a lower plate of the reverse opening slider  8 ′. The insert pin  6 ′ has a side face  42 ′ which can push up a locking pawl  30 ′ provided on the reverse opening slider  8 ′ gradually, the side face  42 ′ provided from a front end of a surface of the insert pin  6 ′ up to a recess  22 ′ capable of accommodating the locking pawl  30 ′.  
         [0005]     In a fastener chain having the reverse opening slider  8 ′ shown in  FIG. 9 , when the insert pin  6 ′ is inserted into an upward opening slider  7 ′ in a condition that the reverse opening slider  8 ′ and the upward opening slider  7 ′ loaded on the fastener chain are kept in contact with each other on the box pin  5 ′ at the bottom end of the fastener chain, the front end of the insert pin  6 ′ makes contact with the top end of a diamond  28 ′ of the reverse opening slider  8 ′, so that the insert pin  6 ′ can not be inserted or fitted smoothly. Further, the projecting portion is provided on the rear face at the corner of the front end of the box pin  5 ′, and is formed so as to make contact with and engages with the front end of the lower plate of the reverse opening slider  8 ′. Therefore, it is difficult to accommodate the box pin  5 ′ in a body of the slider completely to be hidden, so that an appearance of the slide fastener is not good to see.  
       SUMMARY OF THE INVENTION  
       [0006]     The present invention has been achieved in views of the above-described problem. A main object of the invention is to provide a separable bottom end stop for a slide fastener, which can be opened or closed from both ends of a fastener chain and allow an insert pin to be inserted and fitted smoothly without any collision with a diamond of a reverse opening slider when the insert pin is inserted with an upward opening slider kept in contact with the reverse opening slider, a side face on a lower side avoiding the diamond of the reverse opening slider, so that a side of the separable bottom end stop of the fastener chain can be opened smoothly.  
         [0007]     In addition, it is another object of the invention to provide a separable bottom end stop for a slide fastener, in which a position where a protrusion approaches the insert pin most is located on a same line as a vertex of the diamond or located at a insert pin side with respect to the vertex, thereby achieving the inserting and fitting work of the insert pin easily and securely.  
         [0008]     Another object of the invention is to provide a separable bottom end stop for a slide fastener, in which a protrusion projecting in a direction of a side of the box pin is provided on the box pin so as to allow the insert pin to be inserted and fitted smoothly and securely without a collision with the diamond of the reverse opening slider.  
         [0009]     Still another object of the invention is to provide a separable bottom end stop for a slide fastener, in which the insert pin can be inserted easily and smoothly into the upward opening slide and the reverse opening slider by providing the side face of the box pin with a dented portion.  
         [0010]     Further, another object of the invention is to provide a separable bottom end stop for a slide fastener, in which projecting portions for preventing the reverse opening slider from dropping down are provided protrudedly on both the front and rear faces of the box pin, so that the box pin is accommodated into the body of the reverse opening slider, thereby providing the slide fastener with a good appearance.  
         [0011]     Another object of the present invention is to provide a separable bottom end stop for a slide fastener, in which the box pin is completely concealed in the body of the reverse opening slider, and the box pin can be securely engaged in the body of the reverse opening slider.  
         [0012]     Still further object of the invention is to provide a separable bottom end stop for a slide fastener, in which each of the upward opening slider and the reverse opening slider loaded on the fastener chain includes an automatic locking mechanism having a locking pawl.  
         [0013]     To achieve the above-described object, according to the main aspect of the present invention, there is provided a slide fastener having two sliders of an upward opening slider and a reverse opening slider, which are disposed such that rear mouths of the sliders face each other, the slide fastener capable of being opened and closed from both ends of the slide fastener, characterized in that the slide fastener comprises a box pin and an insert pin as a separable bottom end stop on at least one end of the slide fastener; a protrusion projecting from an opposing face is formed at a free end of the box pin, the opposing face facing the insert pin; and the protrusion has side faces, which become narrower progressively in a direction approaching the insert pin in a top view, on upper and lower sides of the protrusion.  
         [0014]     Since the protrusion projecting from the opposing face is provided at the front end of the box pin and the protrusion has the side faces approaching the insert pin on the upper and lower sides thereof, the side face on the upper side can guide the insert pin smoothly, so that the inserting and fitting operation of the insert pin into the reverse opening slider can be carried out easily and securely. In addition, the side face on the lower side avoids the diamond of the slider, thereby allowing the fastener to be opened smoothly from the side of the separable bottom end stop.  
         [0015]     Preferably, a position where the protrusion approaches the insert pin most is located on a same line as a vertex of a diamond of at least one of the upward opening slider and the reverse opening slider, or located at an insert pin side with respect to the vertex.  
         [0016]     Consequently, the inserting and fitting operation of the insert pin can be carried out more easily and securely, and the side face on the lower side avoids the diamond of the reverse opening slider, thereby allowing the fastener to be opened smoothly from the side of the separable bottom end stop.  
         [0017]     Further preferably, the side face on the lower side of the protrusion is formed so as to face a diamond of a reverse opening slider, when the box pin is inserted into the reverse opening slider.  
         [0018]     Consequently, the protrusion of the box pin can be brought into secure contact with an inner end of the diamond of the reverse opening slider and a corner portion at the front end of the insert pin, thereby achieving the insertion operation of the insert pin into the reverse opening slider smoothly.  
         [0019]     In addition, it is preferable that the insert pin has a projecting and recessed row, which is extending in a length direction, on a portion of the insert pin facing the box pin; and the insert pin has a dented portion formed between the side face on the upper side of the protrusion and an opposite portion that makes contact with the projecting and recessed row of the insert pin, such that the dented portion is continuous from the side face on the upper side.  
         [0020]     Consequently, the front end of the insert pin can be prevented from colliding with the locking pawl of the reverse opening slider when the insert pin is inserted into the reverse opening slider, so that the front end of the insert pin can be guided effectively, thereby achieving a smooth insertion.  
         [0021]     Preferably, projecting portions for preventing a reverse opening slider from dropping down are provided protrudedly on front ends of both front and rear faces of the box pin.  
         [0022]     Consequently, the box pin and the engaging insert pin are accommodated in the body of the reverse opening slider and not exposed outside, so that there is no fear that the box pin and the insert pin may be caught by other thing and damaged, whereby the fastener chain is finished with a presentable appearance Further preferably, concave portions are formed in an inner face of a shoulder mouth of the reverse opening slider, and the projecting portions are formed so as to be capable of making contact with concave portions.  
         [0023]     As a consequence, the box pin can be accommodated in the body of the reverse opening slider securely, and thus, the box pin and the engaging insert pin are accommodated in the body easily, so that the box pin and insert pin can be concealed completely.  
         [0024]     Preferably, locking pawls are provided so as to protrude in parts of respective inner faces of the upward opening slider and the reverse opening slider, recesses to be engaged with the locking pawls are provided in the box pin and the insert pin, and the recesses are provided concavely on opposite surfaces of the box pin and the insert pin, respectively.  
         [0025]     As a consequence, a separable bottom end stop capable of exerting an excellent operation and effect can be achieved, and the effects which the present invention attains are very remarkable. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0026]      FIG. 1  is a perspective view showing a box pin and an insert pin of a reverse opening type separable bottom end stop according to a first embodiment.  
         [0027]      FIG. 2  is a perspective view showing back faces of the box pin and insert pin of the separable bottom end stop.  
         [0028]      FIG. 3  is a partial sectional view showing an intermediate state of an inserting and fitting operation of the insert pin of the separable bottom end stop.  
         [0029]      FIG. 4  is a partial sectional view showing a completion state of the inserting and fitting operation of the insert pin of the separable bottom end stop.  
         [0030]      FIG. 5  is a sectional view of the separable bottom end stop taken along line V-V in  FIG. 3 .  
         [0031]      FIG. 6  is a sectional view of the separable bottom end stop taken along the line VI-VI of  FIG. 4 .  
         [0032]      FIG. 7  is a partial sectional view showing a back face of the separable bottom end stop in  FIG. 4 .  
         [0033]      FIG. 8  is a perspective view showing a box pin of a separable bottom end stop according to a second embodiment.  
         [0034]      FIG. 9  is a partial sectional view showing an initial state of an inserting and fitting operation of an insert pin of a well known separable bottom end stop. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0035]     In a separable bottom end stop for a slide fastener according to the present invention, as shown in FIGS.  1  to  7 , fastener elements  37  composed of thermoplastic resin in a single unit are mounted on side edges of fastener tapes  3  constituting fastener stringers  2  in a fastener chain  1  by injection molding means, and reinforcement tapes are bonded to space portions produced by removing the fastener elements of the fastener chain. Then, a substantially rectangular box pin  5  is mounted on one of the space portions while a substantially rectangular insert pin  6  is mounted on the other one of the space portions by injection molding means using thermoplastic resin.  
         [0036]     As for the configuration of the box pin  5 , a protrusion  10  projecting in a triangular shape is provided outside of a bottom end portion, namely, on an opposing face  12  which opposes the insert pin  6 . In addition, a side face  11  on the upper side of the protrusion  10  guides the insert pin  6  while a side face  11  on the lower side makes contact with a diamond  28  of a reverse opening slide  8 . A projecting opposite portion  16  which engages projecting and recessed rows  23  provided on the insert pin  6  is formed on the upper portion of the opposing face  12  of the box pin  5 , and a dented portion  15 , which is dented in a concave shape, is formed between the opposite portion  16  and the protrusion  10 . Further, projecting portions  14  are provided on corner portions of both front and rear faces of the box pin  5  equipped with the protrusion  10 , so that the reverse opening slider  8  makes contact with the projecting portions  14  to prevent the reverse opening slider  8  from dropping from the box pin  5 . Here, the protrusion  10  in the triangular shape includes a triangle, of course, but it also includes the case that at least one of both side faces on upper and lower sides is curved outward or inward.  
         [0037]     When the box pin  5  is disposed on a left side with respect to the fastener chain  1 , a recess  13  is provided at a portion corresponding to a locking pawl  30  provided on the reverse opening slider  8  in the surface of the box pin  5 , so that the locking pawl  30  can be accommodated in the recess  13  securely.  
         [0038]     As for the configuration of the insert pin  6 , the side face facing the box pin  5  is formed linearly, and the projecting and recessed rows  23  which engage the projecting opposite portion  16  provided in the box pin  5  is formed on the outer side of a top end of the insert pin  6 . An outside corner portion of the insert pin  6  when facing the box pin  5 , the outside corner potion being below the projecting and recessed rows  23 , is cut out obliquely to form a chamfered portion  20 , so that the locking pawl  30  of the reverse opening slider  8  is prevented from colliding with the insert pin  6  when the insert pin  6  is inserted.  
         [0039]     A recess  22  capable of accommodating the locking pawl  30  provided on the reverse opening slider  8  is provided on an opposite face to the face having the chamfered portion  20  for the case that the insert pin  6  is used in a right insertion type of the bottom end stop, and further, a side face portion  21  is formed by cutting out the inside corner portion at the front end of the insert pin  6  obliquely. As a consequence, the insertion operation of the insert pin  6  to the upward opening slider  7  and the reverse opening slider  8  is facilitated.  
       First Embodiment  
       [0040]     A separable bottom end stop for a slide fastener according to the present invention will be described. In a separable bottom end stop for a slide fastener according to a first embodiment shown in FIGS.  1  to  7 , fastener elements  37  in a single unit are mounted on swollen core threads  40  with respect to fastener tapes  3 , the core threads being fixed on side edges of the fastener tapes  3  constituting fastener stringers  2  in a fastener chain  1 , by injection molding means using thermoplastic resin such as polyamide, polyacetal, polypropylene, and polybutylene terephthalate. Then, space portions are formed by removing the fastener elements  37  in a specified interval from the fastener chain  1  equipped with the fastener elements  37 , and reinforcement tapes are bonded to the space portions by using a resin film such as polyamide and polyacetal. Consequently, a substantially rectangular box pin  5  is formed on the reinforcement tape on one fastener stringer  2  by injection molding using resin while a substantially rectangular insert pin  6  is formed on the other fastener stringer  2  by injection molding.  
         [0041]     A protrusion  10  projecting in a triangular shape is provided outside of the bottom end of the box pin  5 , namely, on the opposing face  12  which opposes the insert pin  6 . The side face  11  on the upper side of the protrusion  10 , the upper side meaning a side having the fastener elements  37  mounted on the fastener tape  3 , guides the front end of the insert pin  6  in a direction of leaving the box pin  5  while the side face  11  on the lower side makes contact with the inner face of the diamond  28  of the reverse opening slider  8  loaded on the fastener stringers  2 . A vertex in which the upper and lower side faces  11  meet is preferred to be located at a insert pin  6  side with respect to the vertex of the diamond  28  of the reverse opening slider  8 . An opposite portion  16  providing a dense row, which can engage projecting and recessed rows  23  provided on the opposing face  12  of the insert pin  6 , is formed on the upper portion of the opposing face  12  of the box pin  5 . A dented portion  15  is formed between the opposite portion  16  and the protrusion  10 , the entire surface of the dented portion  15  being dented concavely with respect to the surface of the box pin  5 , and the dented portion  15  guides the insertion of the insert pin  6  into the box pin  5  disposed in the reverse opening slider  8  stably when the insert pin  6  is inserted. As a consequence, the insertion of the front end of the insert pin  6  is not blocked by collision with the box pin  5 . In the meantime, the side face  11  may be formed circularly without being restricted to a linear shape.  
         [0042]     Projecting portions  14  projecting outwardly are provided on the corner portions on both front and rear faces at the inner side of the bottom end of the box pin  5 , namely, at the inner side of the edge portion of the fastener tape  3 . Step portions formed by concave portions  29  of the reverse opening slider  8  loaded on the fastener stringers  2  make contact with the projecting portions  14 , thereby preventing the reverse opening slider  8  from escaping from the box pin  5  and dropping down from the fastener stringers  2 . When the box pin  5  is disposed to the left side of the fastener chain  1 , by providing a recess  13  having a concave shape in a portion in the surface of the box pin  5 , the portion corresponding to a locking pawl  30  of an automatic locking mechanism, the automatic locking mechanism provided in the reverse opening slider  8 , the locking pawl  30  is accommodated accurately and easily in the recess  13 .  
         [0043]     The opposing face  12  of the insert pin  6  facing the box pin  5  is formed linearly, and the projecting and recessed rows  23  which engage the opposite portion  16  provided on the box pin  5  protrudedly is formed on the opposing face  12  at the top end portion of the insert pin  6 , and a corner portion of the insert pin  6  on the same side, where the recess  13  is formed in the box pin  5 , is cut out obliquely between the projecting and recessed rows  23  and the front end of the insert pin  6 , so as to form a chamfered portion  20 . Consequently, the locking pawl  30  of the automatic locking mechanism can be avoided when the insert pin  6  is inserted into the upward opening slider  7  and the reverse opening slider  8 .  
         [0044]     On an opposite face to the chamfered portion  20  formed on the insert pin  6 , the recess  22  dented in the concave shape and capable of accommodating the locking pawl  30  of the automatic locking mechanism provided on the reverse opening slider  8  is provided in the surface of the insert pin  6 , in the case the insert pin  6  is used in the right insertion type of the bottom end stop, namely, as shown in  FIG. 7 . Further, a side face portion  21  is formed by obliquely cutting out the corner portion inside of the front end of the insert pin  6  as shown in  FIG. 2 . Provision of the side face portion  21  facilitates the insertion operation of the insert pin  6  into the upward opening slider  7  and the reverse opening slider  8  loaded on the fastener chain  1 . Particularly in case of the right insertion type as shown in  FIG. 7 , the insert pin  6  can be inserted easily with the locking pawl  30  of the reverse opening slider  8  guided such that the locking pawl is raised.  
         [0045]     The upward opening slider  7  and the reverse opening slider  8  used in the present invention are formed of the same type sliders as shown in  FIG. 6 . In each of the sliders  7  and  8 , upper and lower plates  27  are connected to a body  26  with the diamond  28 , mounting posts  33  are erected at the front and rear portions of the upper plate  27 , and a pawl hole  34  which enables the locking pawl  30  provided on a pawl lever  31  to project into the body  26  is provided between the mounting posts  33 . The body  26  supports an end of the pawl lever  31  swingably on the shoulder mouth side of the body  26  between the front and rear mounting posts  33 , and a pivot shaft of a pull tab  36  is placed below the intermediate portion of the pawl lever  31 , so that a spring  32  and a cover  35  are fixed to the mounting posts  33  from above. The concave portions  29  having smaller thickness than other portions are formed on the side of the diamond  28  of the upper and lower plates  27 , and the projecting portions  14  of the box pin  5  enter the concave portions  29 . In the meantime, the concave portions  29  may be provided on only the side of the box pin  5 . The reverse opening slider  8  may adopt a special slider. In this special slider, both sides of the body are parallel to each other, a square shape is provided as seen from the front side (upside), and a dented portion capable of receiving the upward opening slider is formed in the top end of the slider.  
         [0046]     Giving a description of the use condition of the separable bottom end stop for the slide fastener, a top end stop is mounted with resin by injection molding means on the core thread  40  so as to be continuous to the fastener elements  37  of one fastener stringer  2  of the fastener chain  1 , for example, the fastener stringer  2  provided with the box pin  5 , thereby preventing the upward opening slider  7  from dropping down in cooperation with the top end stop on the insert pin  6  side. Of course, the top end stop may be metallic. Further, a top end stop is mounted on the core thread  40  so as to be continuous to the fastener elements  37  of the other fastener stringer  2 , for example, the fastener stringer  2  provided with the insert pin  6 , thereby preventing the upward opening slider  7  from dropping down in cooperation with the top end stop on the box pin  5  side.  
         [0047]     First, the reverse opening slider  8  is loaded on the box pin  5  from the side of the top end stop of the fastener stringer  2  provided with the box pin  5 . Next, the upward opening slider  7  is loaded from the side of the top end stop of the fastener stringer  2  and overlapped with the reverse opening slider  8  mounted on the box pin  5 . In this state, the fastener stringer  2  provided with the insert pin  6  is inserted into the upward opening slider  7  and the reverse opening slider  8  with the insert pin  6  first, as shown in  FIG. 3 , and in the next operation, the fastener stringer  2  is inserted in a state shown in  FIG. 4 . Thereafter, by sliding the upward opening slider  7  upward, the fastener chain  1  is closed.  
         [0048]     To release the fastener chain  1 , the upward opening slider  7  is overlapped with the reverse opening slider  8  disposed at the end portion of the fastener chain  1 , and then, the insert pin  6  is pulled out from the reverse opening slider  8  and the upward opening slider  7 , so that the fastener chain  1  can be released to the right and left fastener stringers  2 . Further, by sliding the reverse opening slider  8  in a direction to the top end stop, the fastener chain  1  can be opened from the side of the box pin  5  and the insert pin  6 , and consequently, the fastener chain  1  can be opened from both sides.  
       Second Embodiment  
       [0049]     A separable bottom end stop for a slide fastener according to a second embodiment shown in  FIG. 8  shows a modification of the box pin  5  mounted on the fastener stringer  2 . As for the configuration of the box pin  5 , the box pin  5  mounted on the core thread  40  of the fastener tape  3  with resin by injection molding is substantially rectangular, and the projecting opposite portion  16  capable of engaging the projecting and recessed rows  23  provided on the insert pin  6  is provided on the opposing face  12  to the insert pin  6  of the box pin  5  on the upper side of the box pin  5 . The protrusion  10  projecting triangularly is provided on the opposing face  12  at the bottom end portion of the box pin  5 , and the projecting portions  14  are provided on the corner portions of both front and rear faces and the recess  13  capable of accommodating the locking pawl  30  of the automatic locking mechanism is provided. The box pin  5  of this embodiment is different from the box pin  5  of the previous embodiment in that no dented portion is provided between the opposite portion  16  and the protrusion  10  on the opposing face  12 .  
         [0050]     The slide fastener having the separable bottom end stop for the slide fastener of the invention at an end portion of the slide fastener is used at a fly of clothes, an opening portion of clothes, and an opening/closing portion of every product such as bags.