Abstract:
The present invention provides a reverse opening type separable end stop having a mechanism which securely locks a reverse opening type slider on a surface of an insert pin or a box pin, thereby blocking the slider from needlessly moving inward, wherein the reverse opening type separable end stop comprises a reverse opening type slider, a box pin and an insert pin, the insert pin or the box pin being provided with a contact portion with which a locking pawl provided on the reverse opening type slider mounted on a fastener chain can always make contact by colliding an end surface thereof in an opening/closing direction at an end portion of the fastener chain, so that the contact portion is locked by the locking pawl, whereby a high quality reverse opening type separable end stop is ensured.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a reverse opening type separable end stop of a slide fastener, and more particularly to a reverse opening type separable end stop which enables a smooth separable end stop operation by improving a box pin and an insert pin of the reverse opening type separable end stop including a reverse opening type slider, the box pin and the insert pin. 
   2. Description of the Related Art 
   A slide fastener has been used as not only an opening/closing device of an opening portion of clothes or a bag but also a connecting device of carpet or artificial lawn divided to a unit size. Although such a type of slide fastener that can be opened or closed from one end side to the other end side in a longitudinal direction of a fastener chain is a general type, there exists another type which can be opened or closed from both end sides in the longitudinal direction of the fastener chain. In this type of slide fastener, two sliders, that is, an opening type slider and a reverse opening type slider are disposed on its fastener chains, and a box pin and an insert pin are attached to one end of the fastener chain, so that a reverse opening type separable end stop comprised of the reverse opening type slider, box pin and insert pin is mounted. 
   As a conventional reverse opening separable end stop, one shown in  FIG. 16  has been known (see, for example, Japanese Patent No. 3621040). A recess  118  is provided on a side surface of the insert pin  104  and a small piece  122  is provided projectingly on a side surface of the box pin  103  opposing the side surface of the insert pin  104 , so that the small piece  122  can be inserted into the recess  118  when the box pin  103  and the insert pin  104  are inserted into the reverse opening type slider  101 . A rising slope  117  is formed from a front end of the insert pin  104  toward its proximal end side. When the insert pin  104  is inserted into the reverse opening type slider  101 , the slope  117  of the insert pin  104  makes contact with a locking pawl  135  provided on the reverse opening type slider  101 , and as the insert pin  104  is moved, the insert pin  104  pushes up the locking pawl  135 , so that the locking pawl  135  can ride on a top surface of the insert pin  104 . A concave portion  113  in which the locking pawl  135  pushed up to the top surface of the insert pin  104  can be inserted is provided on the proximal end side of the insert pin  104  relative to the slope  117 , that is, at a position adjacent to the fastener element. With the insert pin  104  inserted into the reverse opening type slider  101 , the locking pawl  135  is held in the concave portion  113 . Further, a slope  120  for the locking pawl  135 ′ of the opening type slider  102  to ride on a top surface of the box pin  103  is formed on the proximal end of the box pin  103 . 
   Recently, the slide fastener provided with the reverse opening separable end stop has been mounted to articles in various fields and additionally, mounted in different usage style from a conventional usage style. According to the conventional usage style, when the slide fastener is attached to an article, the reverse opening separable end stop has been disposed on a bottom side of the article. According to a new usage style, on the other hand, the reverse opening separable end stop has been disposed on an upper side of an article, for example, an over pants which a skier wears. 
   When the insert pin is inserted into the reverse opening type slider in the reverse opening separable end stop of the slide fastener shown in  FIG. 16 , the locking pawl of the reverse opening type slider is fitted into the concave portion formed in the top surface of the insert pin and maintained. When the reverse opening separable end stop is disposed on an upper side of an article, the reverse opening type slider swings during usage, so that it may be about to move downward of the article due to its own weight, that is, move freely in a direction of departing from the box pin and the insert pin. However, the insert pin and box pin do not have a function of stopping a movement of the reverse opening type slider, and there occurs a problem that the fastener elements may be separated naturally without any intentional operation of the reverse opening type slider. 
   SUMMARY OF THE INVENTION 
   The present invention has been achieved in view of the above-described problems, and a first object of the present invention is to provide a reverse opening type separable end stop of a slide fastener, which can prevent a reverse opening type slider from moving inward of a fastener chain without any reason even when the reverse opening type separable end stop is disposed in an upper side of an article by providing an insert pin or a box pin of the reverse opening type separable end stop with a contact portion with which a locking pawl of the reverse opening type slider makes contact. 
   In addition to the first object, a second object of the present invention is to provide a reverse opening type separable end stop of a slide fastener, which secures a contact between the locking pawl and the contact portion in the insert pin and allows a smooth insertion operation of the insert pin. 
   In addition to the first object, a third object of the present invention is to provide a reverse opening type separable end stop of a slide fastener, which secures a contact between the locking pawl and the contact portion in the box pin. 
   In addition to the first object, a fourth object of the present invention is to provide a reverse opening type separable end stop of a slide fastener, in which the box pin is never an obstacle in a movement path of the contact portion of the insert pin when the insert pin is inserted into the reverse opening type slider, and which allows a smooth insertion operation of the insert pin. 
   In addition to the first object, a fifth aspect of the present invention is to provide a reverse opening type separable end stop of a slide fastener, which secures a wide area of the contact portion making contact with the locking pawl so as to lock the reverse opening type slider securely. 
   To achieve the above-mentioned object, according to a first aspect of the present invention, there is provided a reverse opening type separable end stop of a slide fastener, comprising: a box pin attached to one end in a row direction of fastener elements of one fastener stringer of a pair of right and left fastener stringers; an insert pin attached to one end in a row direction of the fastener elements of the other fastener stringer; and a reverse opening type slider in which the box pin and the insert pin are capable of being inserted, wherein the insert pin or the box pin is provided with a contact portion which is opposed to and makes contact with a locking pawl provided on the reverse opening type slider, and when the contact portion comes into contact with the locking pawl, the reverse opening type slider is prevented from moving inward of a fastener chain. 
   According to a second aspect of the present invention, there is provided the reverse opening type separable end stop of a slide fastener according to the first aspect, wherein the insert pin has the contact portion which is projected from a side surface of the insert pin opposing the box pin, and a notch portion formed from the proximal end of the contact portion to a front end of the insert pin, the notch portion allowing the locking pawl of the reverse opening type slider to invade therein. 
   According to a third aspect of the present invention, there is provided the reverse opening type separable end stop of a slide fastener according to the first aspect, wherein the box pin has a notch portion formed in a side surface thereof opposing the insert pin, the notch portion allowing the locking pawl of the reverse opening type slider to invade therein, and also has the contact portion provided on a peripheral wall thereof constituting the notch portion. 
   According to a fourth aspect of the present invention, there is provided the reverse opening type separable end stop of a slide fastener according to the first aspect, wherein the box pin has insertion pieces projecting from a side surface thereof opposing the insert pin, and the insert pin has accommodating portions capable of accommodating the insertion pieces of the box pin on a side surface thereof opposing the box pin and a contact portion projecting toward the box pin while the contact portion and the insertion pieces are disposed at positions deflected in a front and rear surface direction of the box pin and the insert pin. 
   According a fifth aspect of the present invention, there is provided the reverse opening type separable end stop of a slide fastener according to the first aspect, wherein the insert pin is provided with the contact portion projecting from a side surface thereof opposing the box pin, the contact portion being formed to project such that a width thereof increases gradually from a proximal end side of the insert pin, that is, from a side adjacent to the fastener element toward a front end side. 
   The invention of this application provides following advantageous effects. According to the first aspect of the invention, even when the reverse opening type slider is about to move inward of the fastener chain unintentionally, the contact portion and the locking pawl make contact with each other, thereby preventing the reverse opening type slider from separating fastener elements to right and left sections without any intentional operation. 
   According to the second aspect of the present invention, in addition to the effect of the first aspect, the locking pawl of the reverse opening type slider can be brought into contact with the contact portion in the insert pin securely, and when the insert pin is inserted into the reverse opening type slider, a collision between a front end of the insert pin and the locking pawl can be avoided. 
   According to the third aspect of the present invention, in addition to the effect of the first aspect, the locking pawl of the reverse opening type slider can be brought into contact with the contact portion of the box pin securely. 
   According to the fourth aspect of the present invention, in addition to the effect of the first aspect, the contact portion of the insert pin never collides with the insertion pieces of the box pin when the insert pin is inserted into the reverse opening type slider, so that the insert pin can be inserted smoothly into the reverse opening type slider. 
   According to the fifth aspect of the present invention, in addition to the effect of the first aspect, an area of the contact portion making contact with the locking pawl is increased, so that the contact portion and the locking pawl make contact with each other through a wide area, thereby stopping movement of the reverse opening type slider securely. The effects achieved by the present invention are very remarkable. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a front view of a reverse opening separable end stop according to a first embodiment; 
       FIG. 2  is a perspective view of an insert pin of the first embodiment; 
       FIG. 3  is a front view of the insert pin of the first embodiment; 
       FIG. 4  is a perspective view of a box pin of the first embodiment; 
       FIG. 5  is a front view of the box pin of the first embodiment; 
       FIG. 6  is a sectional view of a state in which insertion of the insert pin into an opening type slider of the first embodiment is started; 
       FIG. 7  is a sectional view of major portions showing a state in which the insert pin of the first embodiment approaches a locking pawl; 
       FIG. 8  is a sectional view of major portions showing a state in which the insert pin of the first embodiment is moving while avoiding a contact with the locking pawl; 
       FIG. 9  is a sectional view when insertion of the insert pin to a reverse opening type slider and the opening type slider of the first embodiment is completed; 
       FIG. 10  is a sectional view showing a state in which the opening type slider is slid; 
       FIG. 11  is a sectional view of major portions showing a state in which the locking pawl and a contact portion make contact with each other when the reverse opening type slider is moved; 
       FIG. 12  is a partial sectional view showing a rear side of the insert pin; 
       FIG. 13  is a perspective view of a box pin according to a second embodiment; 
       FIG. 14  is a sectional view of major portions showing a state in which insertion of the insert pin to a reverse opening type slider of the second embodiment is completed so that a box pin and a locking pawl engage each other; 
       FIG. 15  is a sectional view of a slider to be used as a reverse opening type slider and an opening type slider; and 
       FIG. 16  is a sectional view of a known reverse opening type separable end stop. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   As shown in  FIG. 1 , a reverse opening type separable end stop of a slide fastener according to the present invention comprises a box pin  3  and a insert pin  4  attached to end portions in a longitudinal direction of a fastener chain  5  and a reverse opening type slider  1  in which the box pin  3  and the insert pin  4  can be inserted. The fastener chain  5  has a pair of right and left fastener stringers  6 ,  6 . The fastener stringers  6 ,  6  comprise fastener tapes  8 ,  8 , fastener elements  7 , the box pin  3 , the insert pin  4 , stop ends  14 ,  14 , and two sliders  1 ,  2 . The fastener elements  7  are attached along one side edge of each of the fastener tapes  8 ,  8 . The box pin  3  is attached adjacent to a top end of the fastener elements  7  of one of the fastener stringers  6 ,  6 . The insert pin  4  is attached adjacent to a top end of the fastener elements  7  of the other fastener stringer  6 . The stop ends  14 ,  14  are attached adjacent to bottom ends of the fastener elements  7 ,  7  of the fastener stringers  6 ,  6 . The two sliders  1 ,  2  are capable of engaging or disengaging the fastener elements  7 ,  7 . 
   Upon attachment of the box pin  3  and the insert pin  4 , a space portion  11  is first formed by removing the fastener elements  7  from the fastener tape  8 , and a reinforcement portion  10  is formed by bonding a resin film to the space portion  11 . Then, the box pin  3  and the insert pin  4 , which are made of resin, are fixed to the reinforcement portion  10  by injection molding. 
   The two sliders  1 ,  2  are disposed facing in opposite directions in a back and forth direction, and the fastener elements  7  pass through an interior of each of the respective sliders  1 ,  2 . The two sliders  1 ,  2  have locking pawls  35 ,  35 ′ that can be engaged with the fastener elements  7 . The slider on one side is a reverse opening type slider  1  which constitutes a reverse opening type separable end stop with the box pin  3  and the insert pin  4 . When the reverse opening type slider  1  is moved inward from a top end portion side of the fastener chain  5 , that is, when the slider  1  is moved in a direction of leaving from a state in which it keeps contact with the box pin  3  and the insert pin  4 , the fastener elements  7  in an engaged state can be separated. The other slider is an opening type slider  2  which can make contact with the end stop  14 . The opening type slider  2  can engage the separated fastener elements  7  when the slider  2  is moved from an inside of the fastener chain  5  toward a bottom end portion side, that is, when the slider  2  is moved in a direction of approaching the end stop  14 . 
   As shown in  FIGS. 4 and 5 , the box pin  3  has an inside surface disposed inside of the fastener tape  8 , that is, on a side in which the right and left fastener tapes  8  face each other and an outside surface disposed on an opposite side to the inside surface, that is, outside of the fastener tape  8 . A front end of the box pin  3  has a hook portion  21 , which is projected sideway in an L shape. More specifically, the hook portion  21  is projected inward of the fastener tape  8  from the inside surface, that is, toward an edge portion on the opposite side to an edge portion on which the fastener elements  7  are attached. The hook portion  21  comes into contact with a flange  31  provided on an upper blade plate  28  of the reverse opening type slider  1  so as to stop movement of the reverse opening type slider  1 , thereby preventing the slider  1  from slipping out of the box pin  3 . 
   Insertion pieces  22 ,  23  projecting outward of the fastener tape  8 , that is, toward an insert pin  4  side are formed on the outside surface of the box pin  3 , and the insertion pieces  22 ,  23  can be inserted and accommodated in accommodating portions  18 ,  19  formed in the insert pin. A first insertion piece  22  is provided at a proximal end of the box pin  3 , that is, at an end portion on a side adjacent to the fastener element  7 . The first insertion piece  22  is projected outward from the outside surface near a rear surface of the box pin  3  and can be inserted into a first accommodating portion  19  provided in the insert pin  4 . Further, a second insertion piece  23  is provided at a position nearer the front end of the box pin  3  than the first insertion piece  22 . The second insertion piece  23  is projected outward from the outside surface of the box pin  3  and can be inserted in a second accommodating portion  18  provided in the insert pin  4 . 
   As shown in  FIGS. 2 and 3 , the insert pin  4  has an inside surface disposed inside of the fastener tape  8 , that is, at a side in which the right and left fastener tapes  8  face each other, and an outside surface disposed on an opposite side to the inside surface, that is, outside of the fastener tape  8 . The front end of the insert pin  4  is formed to slightly warp inward of the fastener tape  8  so as to facilitate insertion of the insert pin into the reverse opening type slider  1  and the opening type slider  2 . The insert pin  4  has a contact portion  13  near a front end of the outside surface, that is, a surface facing the outside surface of the box pin  3 . The contact portion  13  is projected toward the box pin  4  and can make contact with an end surface in a back and forth direction of the locking pawl  35  provided on the reverse opening type slider  1 . Further, the insert pin  4  has a notch portion  16  from a proximal end of the contact portion  13  up to the front end of the insert pin  4 . The notch portion  16  is produced by cutting out a boundary portion between a front surface of the insert pin  4  and the outside surface in a step-like fashion, in order to prevent a contact between the insert pin  4  and the locking pawl  35  when the insert pin  4  is inserted into the reverse opening type slider  1 . 
   The contact portion  13  is a sheet-like body which is disposed at an intermediate position in the longitudinal direction of the insert pin  4  and is thinner than a thickness in the front and rear surface direction of the insert pin  4 . The sheet-like body has a front surface continuous with the front surface of the insert pin  4 , a side end surface connecting to the outside surface of the insert pin  4 , and a front end surface extending in a direction intersecting with the side end surface. Thus, the sheet-like body provides a substantially triangular shape whose width dimension, that is, projection amount increases gradually from the proximal end side of the insert pin  4 , that is, a side adjacent to the fastener elements  7  toward the front end side. Consequently, the contact portion  13  is so formed that its front end is wider than the proximal end, so that when the front end surface makes contact with the locking pawl  35 , a wide contact area with the locking pawl  35  can be secured. 
   The outside surface of the insert pin  4  has supporting portions  15 ,  17  projecting outward of the fastener tape  8 , that is, toward the box pin  3 . The supporting portions  15 ,  17  have the accommodating portions  18 ,  19  capable of accommodating the insertion pieces  22 ,  23  of the box pin  3  on a front surface side or a rear surface side of the supporting portions  15 ,  17 . A first supporting portion  15  which is projected outward from the outside surface of the insert pin  4  is provided on the proximal end of the insert pin  4 , that is, an end portion on the side adjacent to the fastener element  7 . On a rear surface side of the first supporting portion  15 , there is provided a first accommodating portion  19  in a concave shape, in which the first insertion piece  22  of the box pin  3  is inserted. Further, a second supporting portion  17  which is projected outward from the outside surface of the insert pin  4  is provided nearer the front end of the insert pin  4  than the first supporting portion  15 . On the front side of the second supporting portion  17 , there is provided a second accommodating portion  18  in a concave shape, in which the second insertion piece  23  of the box pin  3  is inserted. Consequently, the first insertion piece  22  and the first supporting portion  15  overlap each other in a front and rear surface direction of the box pin  3  and the insert pin  4  while the second insertion piece  23  and the second supporting portion  17  overlap each other in the front and rear surface direction. As a result, even if a push-up force is applied to the box pin  3  and the insert pin  4  in the front and rear surface direction, the box pin  3  and the insert pin  4  are positioned without being deflected in the front and rear surface direction. 
   In the reverse opening type separable end stop of this slide fastener, as shown in  FIG. 6 , with the box pin  3  inserted already into the reverse opening type slider  1  and the opening type slider  2 , the insert pin  4  is first inserted into the opening type slider  2  and then, into the reverse opening type slider  1 . The insertion operation is completed in such a manner that, as shown in  FIG. 9 , the second insertion piece  23  of the box pin  3  is inserted and accommodated in the second accommodating portion  18  of the insert pin  4 , the second insertion piece  23  is brought into contact with the first supporting portion  15  of the insertion pin  4  and the second insertion piece  22  is inserted and accommodated in the first accommodating portion  19 . Next, when the opening type slider  2  is slid inward of the fastener chain  5  along the fastener elements  7 , the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6  engage each other, so that the fastener chain  5  is closed as shown in  FIG. 10 . 
   When the fastener chain  5  is closed as shown in  FIG. 10 , the locking pawl  35  of the reverse opening type slider  1  makes contact with the contact portion  13  of the insert pin  4  as shown in  FIG. 11  even if the reverse opening type slider  1  is about to move inward of the fastener chain  5  without any intentional operation, thereby preventing the reverse opening type slider  1  from moving inward of the fastener chain  5 . Thus, the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6  are never separated by the reverse opening type slider  1 . 
   To release the closed fastener chain  5 , the opening type slider  2  is first moved toward the revere opening type slider  1  so as to separate the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6 , and then, as shown in  FIG. 6 , the insert pin  4  is pulled out of the reverse opening type slider  1  and the opening type slider  2 . 
   First Embodiment 
   A reverse opening type separable end stop of a slide fastener according to a first embodiment shown in  FIGS. 1 to 12  is characterized in that an insert pin  4  includes a mechanism for restricting a reverse opening type slider  1  from moving inward of a fastener chain  5 . The fastener chain  5  is produced as follows. A synthetic resin monofilament of polyamide, polyester or the like is wound into a coil or bent into a zigzag fashion so as to form linear fastener elements  7  continuous in the longitudinal direction of a fastener tape  8 , and then, a core thread  12  is made to pass through an interior of the fastener elements  7  and sewed along one side edge in the longitudinal direction of the fastener tape  8  with a sewing yarn  9 . Alternatively, a thermoplastic resin such as polyacetal, polyamide, polypropylene, and polybutylene terephthalate is used to form single unit fastener elements, by means of injection molding means, on an expanded portion formed along one side edge portion in the longitudinal direction of the fastener tape  8  at a predetermined interval in the longitudinal direction of the fastener tape  8  so as to form the fastener chain  5 . 
   Space portions  11  are formed on each of a pair of right and left fastener stringers  6 ,  6  of the fastener chain  5  by removing the fastener elements  7  from the fastener tape  8  at a fixed interval. The space portions  11  are formed on both ends in the longitudinal direction of each fastener stringer  6 . A resin made film, for example, a reinforcement tape formed of a thermoplastic elastomer film on its front surface and a hot-melt type adhesive agent on its rear surface, is fused with ultrasonic wave on each of the space portions  11  located at each end side so as to form a reinforcement portion  10 . A box pin  3  is attached to the reinforcement portion  10  of one of the pair of right and left fastener stringers  6 ,  6  while an insert pin  4  is attached to the reinforcement portion  10  of the other fastener stringer  6 . The box pin  3  and the insert pin  4  are molded by injection molding means using a thermoplastic resin such as polyacetal, polyamide, polypropylene, and polyethylene terephthalate, and fixed adjacent to one end in the row direction of the fastener elements  7 . End stops  14  are attached to the space portions  11  at the other ends of the fastener stringers  6 ,  6 . The end stops  14  are molded by injection molding means using a same thermoplastic resin as the box pin  3  and the insert pin  4  and fixed adjacent to the other ends in the row direction of the fastener elements  7 ,  7 . 
   In the fastener chain  5  having the box pin  3 , the insert pin  4  and the end stops  14  molded therein, as shown in  FIG. 1 , a reverse opening type slider  1  and an opening type slider  2  are inserted through the fastener elements  7 . The reverse opening type slider  1  has its front end side in a sliding direction relative to the fastener elements  7  disposed to face the box pin  3  and the insert pin  4 . The opening type slider  2  has its front end side in a direction opposite to the reverse opening type slider  1 , that is, in the sliding direction, the front end side facing toward a side of the end stop  14 . The respective sliders  1 ,  2  are molded by die casting means using metal such as aluminum alloy or zinc alloy. The reverse opening type slider  1  and the opening type slider  2  are mounted to the fastener stringer  6  on a side equipped with the box pin  3  such that they cannot slip out. Thus, the both sliders  1 ,  2  are blocked from slipping out of the fastener elements  7  by the box pin  3  attached to one end of the fastener elements  7  and the end stop  14  attached to the other end. 
   The reverse opening type slider  1  and the opening type slider  2  have a same configuration, for example, each are comprised of an upper blade plate  28  and a lower blade plate  29 , a diamond  33 , a slider body  30 , a locking pawl  35 , a leaf spring  37 , a cover  38 , and a pull tab  40  as shown in  FIG. 15 . The upper blade plate  28  and lower blade plate  29  are disposed in parallel with a gap in the vertical direction. The diamond  33  connects ends of the respective blade plates  28 ,  29 . The slider body  30  has flanges  31  projecting from right and left side edges of at least one of the upper blade plate  28  and lower blade plate  29  toward the other one. The locking pawl  35  is disposed on a top surface of the upper blade plate  28  and can come out/retract with respect to an element guide passage  32  formed between the upper blade plate  28  and the lower blade plate  29  through a pawl hole  34  formed in the upper blade plate  28 . The leaf spring  37  makes contact with a top surface of the locking pawl  35  to urge the locking pawl  35  elastically in a direction of projecting into the element guide passage  32 . The cover  38  is fixed to an attaching post  36  standing from the top surface of the upper blade plate  28  to accommodate the locking pawl  35  and the leaf spring  37  therein. The pull tab  40  has a shaft portion  41  disposed between the slider body  30  and the locking pawl  35  and lifts up the locking pawl  35  and pulls out the locking pawl  35  from the element guide passage  32  by moving the shaft portion  41  upward. The respective sliders  1 ,  2  are disposed such that movements in the back and forth direction of the sliders  1 ,  2  are opposite to each other with respect to the fastener chain  5 , so that the fastener elements  7  can be separated when the sliders are moved inward from an end portion of the fastener chain  5 . 
   The box pin  3  and the insert pin  4  as the reverse opening type separable end stop will be described. The box pin  3  is entirely a substantial L-shaped rod body whose front end projects sideway as seen in a front view as shown in  FIGS. 4 and 5  and is fixed along one side edge of the fastener tape  8  such that the box pin  3  adjoins one end in the row direction of the fastener elements  7 . The reinforcement portion  10  on which the reinforcement tape is bonded is formed on a tape portion of the fastener tape  8  on which the box pin  3  is to be fixed. The reinforcement portion  10  reinforces the tape portion so as to prevent the tape portion from being deformed too much in order to facilitate handling of the reverse opening type separable end stop by gripping the tape portion in a vicinity of the box pin with the fingers when the reverse opening type separable end stop is operated. 
   The box pin  3  has a front surface, a rear surface, an inside surface located inside of the fastener tape  8  in the right-left direction perpendicular to the front and rear surface direction of the box pin  3 , and an outside surface located outside of the fastener tape  8 . The front end of the box pin  3  is provided with an L-shaped hook portion  21  which is projected from the inside surface inward of the fastener tape  8 , that is, toward the opposite side to a side in which the outside surface exists. A width in the right-left direction of the front end of the box pin  3  containing the hook portion  21  is formed larger than a width of the proximal end of the box pin  3 . Consequently, when the front end of the box pin  3  is about to enter the element guide passage  32  of the reverse opening type slider  1 , the hook portion  21  comes into contact with a front end of a flange  31  formed on the upper blade plate  28  of the reverse opening type slider  1  while the outside surface of the box pin  3  comes into contact with a side surface of the diamond  33  of the reverse opening type slider  1 , as shown in  FIG. 6 . With this configuration, the front end of the box pin  3  cannot pass through an interior of the element guide passage  32 , thereby preventing the reverse opening type slider  1  from slipping out of the box pin  3 . 
   The proximal end of the box pin  3  is located on an opposite side in a longitudinal direction of the box pin  3  with respect to the front end of the box pin  3  such that the proximal end of the box pin  3  adjoins one end in a row direction of the fastener elements  7 . A first insertion piece  22 , which is projected from the outside surface of the box pin  3  outward of the fastener tape  8 , that is, toward the opposite side to a side in which the inside surface exists, is formed at the proximal end of the box pin  3 . The first insertion piece  22  is a sheet body thinner than a thickness in the front and rear surface direction of the box pin  3 . The first insertion piece  22  has a rear surface continuous with the rear surface of the box pin  3 , and can be accommodated in a first accommodating portion  19  in a concave shape provided in the insert pin  4 . A second insertion piece  23 , which is projected outward of the fastener tape  8  from the outside surface of the box pin  3  is formed nearer the front end of the box pin  3  than the first insertion piece  22 . The second insertion piece  23  is a sheet body thinner than the thickness in the front and rear surface direction of the box pin  3 . The second insertion piece  23  is disposed in a center in the front and rear surface direction of the box pin  3  and can be accommodated in a second accommodating portion  18  in a concave shape provided in the insert pin  4 . Since the respective insertion pieces  22 ,  23  are inserted into the respective accommodating portions  19 ,  18 , the box pin  3  and the insert pin  4  can be kept stably kept without being deflected when the box pin  3  and the insert pin  4  are inserted into the reverse opening type slider  1 . 
   As shown in  FIGS. 2 and 3 , the insert pin  4  is fixed along one side edge of the fastener tape  8  such that the insert pin  4  adjoins one end in the row direction of the fastener elements  7  at one end in the longitudinal direction of the fastener stringer  6 . The insert pin  4  is curved into an arc with its front end being directed inward of the fastener tape  8 , that is, toward an edge portion side of the fastener tape  8  on the opposite side to an edge portion provided with the fastener elements  7 . Thus, the insert pin is formed in a shape of being slightly warped in a front view. The reinforcement portion  10  on which the reinforcement tape is bonded is formed at a tape portion of the fastener tape  8  on which the insert pin  4  is to be fixed like the box pin  3 , thereby reinforcing the tape portion in a vicinity of the insert pin to prevent the tape portion from being deformed too much. 
   The insert pin  4  has a front surface, a rear surface, an inside surface located inside of the fastener tape  8  in the right-left direction perpendicular to the front and rear surface direction of the insert pin  4 , and an outside surface located outside of the fastener tape  8 . On the outside surface of the insert pin  4 , that is, a surface facing the box pin  3 , a contact portion  13  which is projected outward of the fastener tape  8  is formed at a position near the front end with respect to the center in the longitudinal direction of the insert pin  4 . The contact portion  13  is a sheet body thinner than the thickness in the front and rear surface direction of the insert pin  4 , and provides a substantially triangular shape as seen in its front view. The contact portion  13  has a side end surface extending from the proximal end side of the insert pin  4  toward the front end side in the longitudinal direction of the insert pin  4 , and a front end surface intersecting with the side end surface and extending in the right-left direction perpendicular to the longitudinal direction of the insert pin  4 . As shown in  FIG. 15 , the front end surface of the contact portion  13  comes into contact with a rear end surface in the back and forth direction of the slider  1  at the locking pawl  35  projected into the interior of the element guide passage  32  from the upper blade plate  28  of the reverse opening type slider  1  so as to stop movement of the reverse opening type slider  1 . 
   The contact portion  13  is disposed at a position near a front surface side in the front and rear surface direction of the insert pin  4 . The contact portion  13  is deflected from the first insertion piece  22  and the second insertion piece  23  of the box pin  3  in their projection positions in the front and rear surface direction of the box pin  3  and insert pin  4 . The contact portion  13  is located near the front surface side, the first insertion piece  22  is located near a rear surface side, the second insertion piece  23  is located between the contact portion  13  and the first insertion piece  22 . Consequently, when the insert pin  4  is inserted into the reverse opening type slider  1 , so that when the insert pin  4  and the box pin  3  are located nearby, the insert pin  4  is blocked from making contact with the first insertion piece  22  and the second insertion piece  23  of the box pin  3 . 
   The insert pin  4  has a notch portion  16  formed from the proximal portion of the contact portion  13 , that is, from a corner portion in which the front end surface of the contact portion  13  and the outside surface of the insert pin  4  intersect up to the front end of the insert pin  4 . The notch portion  16  is produced by cutting out a portion in which the front surface and the outside surface of the insert pin  4  intersect into a step-like fashion. The locking pawl  35  is projected into the element guide passage  32  and its projection position is located in an insertion passage of the insert pin  4  inserted into the element guide passage  32 . With this configuration, when the insert pin  4  is inserted into the element guide passage  32 , the locking pawl  35  invades into the notch portion  16  during an insertion process so as to form a space for avoiding a contact between the insert pin  4  and the locking pawl  35 . 
   The proximal end of the insert pin  4  is located on an opposite side in the longitudinal direction of the insert pin  4  with respect to the front end of the insert pin  4  and adjoins one end portion in the row direction of the fastener elements  7 . A first supporting portion  15  is formed at the proximal end of the insert pin  4  such that the first supporting portion  15  is projected from the outside surface of the insert pin  4  outward of the fastener tape  8 , that is, toward an opposite side to the side in which the inside surface exists. The first supporting portion  15  is a sheet body thinner than the thickness in the front and rear surface direction of the insert pin  4 , which has a surface continuous with the front surface of the insert pin  4 . A first accommodating portion  19  in a concave shape is formed in a rear surface of the first supporting portion  15  such that the first accommodating portion  19  is open outward of the fastener tape  8 , that is, toward the outside surface of the box pin  3 . When the first insertion piece  22  of the box pin  3  is inserted into the first accommodating portion  19  of the insert pin  4 , the first supporting portion  15  and the first insertion piece  22  can overlap each other in the front and rear surface direction of the box pin  3  and the insert pin  4 . An engaging projection  20  which projects toward a side of the fastener elements  7  adjacent to the insert pin  4  is formed at a front end of the first supporting portion  15 . The engaging projection  20  can engage the fastener element  7  of the fastener stringer  6  on the side provided with the box pin  3  when the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6  are coupled with each other. 
   A second supporting portion  17  which is projected outward of the fastener tape  8  from the outside surface of the insert pin  4  is formed at a position nearer the front end of the insert pin  4  than the first supporting portion  15  of the insert pin  4 . The second supporting portion  17  is a sheet body thinner than the thickness in the front and rear surface direction of the insert pin  4 , and is disposed at a position near the rear surface in the front and rear surface direction of the insert pin  4 . A second accommodating portion  18  in a concave shape which is open outward of the fastener tape  8 , that is, toward the outside surface of the box pin  3  is formed on a top surface of the second supporting portion  17 . When the second insertion piece  23  of the box pin  3  is inserted into the second accommodating portion  18  of the insert pin  4 , the second supporting portion  17  and the second insertion piece  23  can overlap each other in the front and rear surface direction of the box pin  3  and the insert pin  4 . The second supporting portion  17  has a slope face which is extended from its front end toward the outside surface of the insert pin  4  and inclined downward toward the front end side of the insert pin  4 . Consequently, even if the second supporting portion  17  comes into contact with the diamond  33  of the opening type slider  2  when the insert pin  4  is inserted into the opening type slider  2 , the slope face of the second supporting portion  17  moves while sliding on a side surface of the diamond  33 , so that the insert pin  4  can be inserted smoothly into the opening type slider  2 . 
   An action of the reverse opening type separable end stop of the slide fastener will be described. As shown in  FIG. 6 , when inserting the insert pin  4  into the reverse opening type slider  1  and the opening type slider  2  in which the box pin  3  is inserted, the insert pin  4  is inserted into the element guide passage  32  in the opening type slider  2  from the front end side of the slider  2  and next, inserted into the element guide passage  32  in the reverse opening type slider  1  from the rear end side of the slider  1 . As shown in  FIGS. 7 and 8 , the insert pin  4  inserted into the element guide passage  32  in the reverse opening type slider  1  is moved toward the front end side of the reverse opening type slider  1  with the front end of the locking pawl  35  of the slider  1  invading in the notch portion  16  formed in the front end of the insert pin  4 . Thereafter, as shown in  FIG. 9 , the second insertion piece  23  of the box pin  3  and the first supporting portion  15  of the insert pin  4  come into contact with each other so as to complete insertion of the insert pin  4 . A locking pawl  35 ′ provided on the opening type slider  2  is projected into the element guide passage  32  between the box pin  3  and the fastener element  7  adjacent to the box pin  3 . Consequently, when the opening type slider  2  is about to move in the direction of leaving the reverse opening type slider  1 , the locking pawl  35 ′ comes into contact with the fastener element  7 , thereby stopping the movement of the opening type slider  2 . 
   When the pull tab  40  of the opening type slider  2  is operated, the locking pawl  35 ′ of the slider  2  is lifted up to leave the element guide passage  32 , the opening type slider  2  is moved inward of the fastener chain  5 , that is, in a direction of leaving the reverse opening type separable end stop comprised of the box pin  3 , the insert pin  4  and the reverse opening type slider  1 . The opening type slider  2  is slid along the fastener elements  7 ,  7  so as to couple the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6 , thereby closing the fastener chain  5  as shown in  FIG. 10 . 
   The first supporting portion  15  of the insert pin  4  is located on a front surface side of the first insertion piece  22  of the box pin  3 , and the second insertion piece  23  of the box pin  3  is located on a front surface side of the second supporting portion  17  of the insert pin  4 , so that the two insertion pieces of the box pin  3  and the two supporting portions of the insert pin  4  overlap with a different positional relationship of the front and rear surfaces. For this reason, even if a push-up force is applied to the box pin  3  and the insert pin  4  from any direction from the front surface or the rear surface, postures of the box pin  3  and insert pin  4  are not deflected. Thus, there never occurs such a phenomenon that a large gap is generated between the box pin  3  and the insert pin  4  by the push-up force, so that separation of a coupled state is induced with respect to the fastener elements  7  adjacent to the box pin  3  and the insert pin  4 . 
   The engaging projection  20  formed on the first supporting portion  15  of the insert pin  4  engages the fastener element  7  adjacent to the box pin  3 , so that even if a push-up force in the front and rear surface direction is applied to a portion between the box pin  3  or the insert pin  4  and the fastener element  7 , a posture of this portion is not deflected. Accordingly, there never occurs such a phenomenon that a large gap is generated between the box pin  3  or the insert pin  4  and the fastener element  7  by the push-up force so that separation of the coupled state is induced with respect to the fastener elements  7  from this portion. 
   Assuming that after the fastener chain  5  is closed with the opening type slider  2 , the reverse opening type slider  1  is moved inward of the fastener chain  5  from a position indicated with a phantom line as shown in  FIG. 11 , that is, from a state in which the front end of the flange  31  of the reverse opening type slider  1  keeps contact with the hook portion  21  of the box pin  3  without any intentional operation, namely, the front end of the flange  31  departs from the hook portion  21  of the box pin  3 . In this case, the contact portion  13  of the insert pin  4  comes into contact with the locking pawl  35  of the reverse opening type slider  1 , thereby stopping the movement of the reverse opening type slider  1 . 
   To separate the closed fastener chain  5  to the right and left fastener stringers  6 ,  6 , the opening type slider  2  is slid toward the separable end stop along the fastener elements  7  so as to separate the fastener elements  7 ,  7  of the right and left fastener stringers  6 ,  6 . Next, the opening type slider  2  is moved up to a position in which the slider  2  makes contact with the reverse opening type slider  1  with the opening type slider  2  being mounted on the box pin  3  and the insert pin  4 . Then, as show in  FIG. 6 , when the insert pin  4  is pulled out of the respective element guide passages  32 ,  32  in the reverse opening type slider  1  and the opening type slider  2 , the fastener stringer  6  on the insert pin  4  side and the fastener stringer  6  on the box pin  3  side can be separated from each other. 
   Second Embodiment 
   A reverse opening type separable end stop of a slide fastener according to a second embodiment shown in  FIGS. 13 and 14  is characterized in that a box pin  3  has a mechanism which blocks a reverse opening type slider  1  from moving inward of a fastener chain  5 . A configuration of the fastener chain  5  is the same as that of the first embodiment. In the fastener chain  5 , coil-like fastener elements  7  containing a core thread  12  inside are sewed along side edges in the longitudinal direction of fastener tapes  8 ,  8  of a pair of right and left fastener stringers  6 ,  6  with a sewing yarn  9 . A reinforcement portion  10  is formed by bonding a resin film on a space portion  11  disposed at one end in the longitudinal direction of each of the fastener stringers  6 ,  6 , and the box pin  3  is formed of a thermoplastic resin on the reinforcement portion  10  of the one fastener stringer  6  while the insert pin  4  is formed of a thermoplastic resin on the reinforcement portion  10  of the other fastener stringer  6 . 
   The box pin  3  has the same configuration as the box pin  3  of the first embodiment except that the contact portion  13  and the notch portion  16  are provided. As shown in  FIG. 13 , a front end of the box pin  3  is projected sideway providing entirely a substantially L-shaped configuration, and the box pin  3  includes a hook portion  21 , a first insertion piece  22 , and a second insertion piece  23 . The hook portion  21  projects inward of the fastener tape  8  from the inside surface at the front end of the box pin  3 . The first insertion piece  22  projects outward of the fastener tape  8  from the outside surface at the proximal end adjacent to the fastener element  7 . The second insertion piece  23  is disposed at a position nearer the front end of the box pin  3  than the first insertion piece  22  and projects from the outside surface of the box pin  3 . The hook portion  21  blocks the reverse opening type slider  1  from slipping out of the box pin  3 , and the first insertion piece  22  and the second insertion piece  23  are inserted into the first accommodating portion  19  and the second accommodating portion  18  disposed in the insert pin  4 . 
   A notch portion  16  is formed at a position nearer the proximal end of the box pin  3  than the hook portion  21  by cutting out a boundary portion in a step-like fashion in which the surface and the outside surface of the box pin  3  intersect. While the box pin  3  is inserted into the element guide passage  32  in the reverse opening type slider  1 , a locking pawl  35  of the reverse opening type slider  1  invades into the notch portion  16 , thereby preventing the box pin  3  and the locking pawl  35  from making contact with each other. Further, the notch portion  16  is constructed as the contact portion  13  for its peripheral wall to be able to make contact with the locking pawl  35 . The notch portion  16  provides a substantially triangular shape as the box pin  3  is seen in its plan view, and includes a lateral wall surface in which a peripheral wall of the notch portion  16  extends in a right-left direction of the box pin  3  and a longitudinal wall surface extending in a longitudinal direction of the box pin  3 . The lateral wall surface and the longitudinal wall surface intersect at a position inside of the box pin  3 , that is, at a position apart from the outside surface of the box pin  3  toward the inside surface, thereby forming a corner portion  24 . The lateral wall surface of the notch portion  16  is a face directed in the back and forth direction of the reverse opening type slider  1  and comes into contact with an end surface in a back and forth direction of the locking pawl  35 . 
   The insert pin  4  is not provided with the notch portion  16  and the contact portion  13 , and other configuration is the same as that of the insert pin  4  of the first embodiment. As shown in  FIG. 14 , a front end of the insert pin  4  is curved in an arc shape inward of the fastener tape  8 , and provides an entirely warped configuration. The insert pin  4  includes a first supporting portion  15  projecting outward of the fastener tape  8  from the outside surface at the proximal end adjacent to the fastener element  7  and a second supporting portion  17  which is disposed nearer the front end side of the insert pin  4  than the first supporting portion  15  and projected from the outside surface of the insert pin  4 . A first accommodating portion  19  in a concave shape is provided on the rear surface side of the first supporting portion  15  while a second accommodating portion  18  in a concave shape is provided on the front surface side of the second supporting portion  17 . Further, an engaging projection  20  for engaging the fastener element  7  on the box pin  3  side is provided at the front end of the first supporting portion  15 . 
   In a state in which the box pin  3  and the insert pin  4  are inserted into the element guide passage  32  of the reverse opening type slider  1 , the first insertion piece  22  of the box pin  3  is accommodated in the first accommodating portion  19  provided in the insert pin  4  while the second insertion piece  23  of the box pin  3  is accommodated in the second accommodating portion  18 . Further, the first insertion piece  22  and the first supporting portion  15  overlap each other in the front and rear surface direction of the box pin  3  and the insert pin  4 , and the second insertion piece  23  and the second supporting portion  17  overlap each other in the front and rear surface direction. In case of providing the box pin  3  with the contact portion  13 , the insert pin  4  is of left side insertion type which is to be inserted into the element guide passage  32  on a left side across the diamond  33  of the reverse opening type slider  1 . On the other hand, in the case of the first embodiment, the insert pin  4  is of right side insertion type which is to be inserted into the element guide passage  32  on a right side across the diamond  33 . 
   The reverse opening type separable end stop of the slide fastener of the present invention is mounted on a fastener chain to be attached to, for example, an opening/closing portion of clothes or bags and a joint portion of carpet and artificial lawn, in order to prevent the reverse opening type slider from being moved freely without any intentional operation.