HK1151699B - Metallic one-side teeth and two-way slide fastener - Google Patents

Description

Metallic single-sided tooth and two-way slide fastener

Technical Field

The present invention relates to a metallic one-sided tooth having a convex engagement portion and a concave engagement portion formed on each of both surfaces of an engagement head, and a two-way slide fastener including the metallic one-sided tooth.

Background

A slide fastener is widely used for opening and closing an opening of a bag or the like. As one of such slide fasteners, a two-way slide fastener is known in which two sliders are arranged in a fastener chain so as to face each other with a head portion thereof closed or a tail portion thereof closed. In a two-way slide fastener, opening and closing of a fastener chain can be performed by sliding two sliders in either of the front and rear directions along a element row.

A slide fastener using metallic single-sided engaging teeth is known as engaging teeth attached to a two-way slide fastener. By using the metallic one-side engaging element, a two-way slide fastener having a high lateral pull strength, a metallic glossy surface, and an excellent appearance can be obtained. Then, as a shape of the metallic one-side engaging tooth, an engaging convex portion is formed on one surface of the engaging head portion, and an engaging concave portion is formed on the other surface.

In addition, in a two-way slide fastener using a general metallic single-sided tooth, when one slider is slid to engage and disengage the metallic single-sided tooth with each other, sliding resistance is small, and smooth operation is possible. Then, for example, when the other slider is slid to separate the metallic single-sided teeth from each other from the engaged state, even if the sliding resistance is slightly higher than that when the one slider is slid, the metallic single-sided teeth can be smoothly separated from each other.

However, when the metallic single-sided teeth are engaged with each other by the other slider, the sliding resistance increases, and the slide fastener cannot be smoothly opened and closed.

This is considered to be caused by the fact that when the metallic one-sided teeth are meshed with each other, the outer edge of the meshing recess gradually meshes with the meshing head of the meshing counterpart tooth while being brought into collision contact with each other. Therefore, the slider does not slide smoothly.

Various proposals have been made on the shape of a metallic one-sided tooth in order to prevent collision contact between the outer edge of the meshing recess and the meshing head of the meshing partner tooth that meshes. As an example of such a metallic single-sided tooth, the applicant of the present application has already proposed a metallic single-sided tooth formed by a fastener element forming apparatus (see patent document 1), a fastener element (see patent document 2), and the like.

The metal single-sided tooth described in patent document 2 is a metal single-sided tooth in which a metal single-sided tooth that can be formed by the forming apparatus of patent document 1 is improved. In addition, the drawings of patent document 2 show the structure of a metal single-side meshing feature portion in patent document 1. Therefore, in order to describe the structure of the characteristic portion of the metallic single-sided tooth that can be formed by the forming apparatus of patent document 1, the description will be made using a cross-sectional view and a perspective view of the metallic single-sided tooth described in patent document 2.

Fig. 5 is a sectional view showing a coupling head portion of the metallic one-sided coupling tooth of patent document 2, and fig. 6 is a main portion perspective view showing the coupling head portion of the metallic one-sided coupling tooth of patent document 2. In the metallic one-sided tooth system of patent document 1, a tapered surface 37 is formed on the front end wall of the engagement head 33 on the side of the engagement recess 35.

Fig. 5 and 6 are described as conventional example 2 of the present invention.

First, in fig. 5, a case where the two engagement head portions 33b and 33c are engaged will be described. Fig. 5 shows a state where the engagement head 33b starts to engage with the engagement head 33a that has already engaged with another metallic one-sided engagement tooth, and the engagement head 33c attempts to engage with the engagement head 33b from this point.

When the slider, not shown, is slid to engage the two engagement heads 33b, 33c with each other, in order to prevent the engagement convex portion 34c gradually engaged from coming into collision contact with the front end wall 36b of the engaged engagement head 33b while being engaged, a tapered surface 37b is formed on the front end wall 36b of the engagement head 33 b. Similarly, in the engaging heads 33a and 33c, inclined surfaces 37a and 37c are formed on the front end walls 36a and 36c of the engaging heads 33a and 33c, respectively, in order to prevent collision contact with the engaging projections of the mating members to be engaged.

Fig. 5 shows a state in which the engagement convex portion 34b formed on the engagement head 33b is inserted into the engagement concave portion 35a through a region of the inclined surface 37a formed on the front end wall 36a of the engagement head 33 a.

Then, as shown in fig. 6, by forming the inclined surface 37 on the front end wall 36 of the engagement head 33, the sliding resistance of the slider at the time of engagement can be reduced, and the slider can be smoothly slid. Then, by using the metallic single-sided teeth formed by the device of patent document 1 for the two-way slide fastener, it is possible to improve the slidability of the slider when the metallic single-sided teeth are engaged with each other.

However, even when the metallic single-sided tooth system configured by the apparatus of patent document 1 is used for the two-way slide fastener, when a lateral pulling force is applied to the two-way slide fastener after the engagement, the lateral pulling force acts on the opening edge 39 of the engagement recess 35 of the metallic single-sided tooth system shown in fig. 6. Further, since the inclined surface 37c is formed on the front end wall 36 of the engagement head 33, the wall thickness of the opening edge 39 of the engagement recess 35 is made thin.

Therefore, when a moment generated by the lateral pulling force acts on the opening edge 39 of the engagement recess 35 having a reduced thickness, the amount of deflection of the opening edge 39 increases. If the opening edge 39 is greatly bent, the slider may have poor sliding properties.

Therefore, the metal single-sided tooth described in patent document 2 is improved in that when a moment generated by a lateral tensile force acts on the opening edge 39 of the meshing recess 35, the amount of deflection of the opening edge 39 is reduced. In the metallic one-sided tooth system of patent document 2, as shown in fig. 6, a rib 38 is formed on the inner surface of the front end wall 36 of the engagement head 33.

The rigidity of the opening edge 39 is increased by the rib 38 formed on the inner side face of the front end wall 36 of the engagement head 33. Then, the rigidity of the opening edge 39 is increased, thereby reducing the amount of deflection of the opening edge 39. By reducing the amount of deflection of the opening edge 39, the slidability of the slider can be greatly improved.

Patent document 1: japanese patent laid-open publication No. 58-116946

Patent document 2: japanese examined patent publication (Kokoku) No. 1-22505

The metallic one-side engagement tooth described in patent document 2 is a metallic one-side engagement tooth improved from the metallic one-side engagement tooth described in patent document 1, and is capable of greatly improving the slidability of the slider. Further, the meshing teeth can be configured in a structure in which the rigidity with respect to the moment generated by the lateral tensile force is improved. In order to form the metallic one-sided tooth described in patent document 2, it is necessary to form the rib 38 in the engagement recess 35 and to form the inclined surface 37c in the front end wall 36 of the engagement head 33. Therefore, it is necessary to use a complicated mold shape for forming, and the manufacturing process of the metallic single-sided tooth becomes a complicated process.

Accordingly, the present invention provides a metallic one-sided tooth that prevents collision contact during engagement, can improve rigidity against moment generated by lateral pulling force, and can be configured with a simple structure, and a two-way slide fastener using the metallic one-sided tooth.

Disclosure of Invention

In order to achieve the above object, the one-sided metal meshing tooth according to the present invention is a one-sided metal meshing tooth having a meshing convex portion formed on one surface side of a meshing head portion and a meshing concave portion formed on the other surface side, and is characterized in that an upper inclined surface inclined downward is formed from a distal end edge side of the meshing head portion into the meshing concave portion, and the one-sided metal meshing tooth is configured such that an inner peripheral surface of the meshing concave portion on the distal end edge side of the meshing head portion is connected to the upper inclined surface.

In the metallic one-sided tooth according to the present invention, the upper inclined surface is formed between a front end edge of the engagement head and an opening edge of the engagement recess.

Further, in the metallic one-sided tooth according to the present invention, a tip end edge of the engagement head portion and an end edge of the upper inclined surface on the tip end edge side are disposed to be separated from each other.

In the metallic one-sided tooth system according to the present invention, an inner peripheral surface of the meshing recess portion connected to the upper inclined surface is formed as a lower inclined surface extending outward from a bottom surface of the meshing recess portion, and an inclination angle of the upper inclined surface is formed to be shallower than that of the lower inclined surface.

In the metallic single-sided tooth according to the present invention, the inclination angle of the upper inclined surface is larger than 0 degrees and is 7 degrees or less.

Further, in the metallic single-sided tooth system according to the present invention, the upper inclined surface is inclined at an angle of 3 degrees to 7 degrees.

In the metallic one-sided tooth according to the present invention, the lateral width dimension of the upper inclined surface in the lateral direction is set to be in a range of 89% to 92% of the lateral width dimension of the bottom surface of the engagement recess.

The two-way slide fastener of the present invention is characterized in that it comprises a fastener stringer formed by arranging the metallic single-sided teeth of the present invention at a predetermined interval on opposing side edges of a pair of right and left fastener tapes.

Effects of the invention

In the metallic one-sided tooth according to the present invention, an upper inclined surface is formed to be inclined downward toward the inside of the engagement recess. Therefore, the engaging convex portion on the mating side which engages with the engaging concave portion can draw a track which passes through the upper inclined surface side formed on the engaging concave portion and is inserted into the engaging concave portion. Then, as the mating-side engaging head, a gap for avoiding collision contact can be provided between the engaging convex portion which is engaged next time by the upper inclined surface side of the engaging concave portion which is engaged. Therefore, the engaging convex portion can be gradually and smoothly engaged with the engaging concave portion on the mating side of the engagement.

In the metallic one-sided tooth system described in patent documents 1 and 2, as shown in fig. 5, the engagement convex portion 34b of the engagement head 33b is engaged with the engagement concave portion 35a while drawing a trajectory which passes through the side of the inclined surface 37a formed in the engagement head 33a and is fitted into the engagement concave portion 35a of the engagement head 33 a. Similarly, the engagement convex portion 34c of the engagement head 33c engages with the engagement concave portion 35b while drawing a track which passes through the inclined surface 37b side formed on the engagement head 33b and is fitted into the engagement concave portion 35b of the engagement head 33 b.

In this way, in the metallic one-sided tooth system described in patent documents 1 and 2, a gap for avoiding collision contact is provided between the tooth convex portions that mesh with the next tooth system by passing through the inclined surface side. In contrast, in the metallic one-sided tooth according to the present invention, the engagement convex portion passes through the upper inclined surface side formed on the engagement concave portion of the engagement target, and thereby, collision contact with the engagement convex portion of the engagement head of the next engagement can be avoided while collision contact between the engagement convex portion and the engagement concave portion of the engagement target is avoided.

In the case where the metallic one-sided engaging element of the present invention is used for a two-way slide fastener, when a lateral pulling force is applied to the two-way slide fastener after engagement, a moment generated by a pressing force from the engaging convex portion on the engaged counterpart side acts on the opening edge of the engaging concave portion. That is, a moment generated by the lateral pulling force acts greatly on the connection portion between the inner peripheral surface of the engagement recess portion on the tip edge side of the engagement head portion of the metallic one-sided engagement tooth and the upper inclined surface.

However, in the present invention, since the wall thickness of the opening edge of the engagement recess portion is formed thick, even if a moment generated by a lateral tensile force acts on the opening edge of the engagement recess portion, the amount of deflection of the opening edge of the engagement recess portion is extremely small. Thus, deformation such as poor sliding performance of the slider is not generated on the front end edge side of the engagement head, and the sliding performance of the slider can be maintained well.

Further, in the present invention, since the upper inclined surface is formed between the front end edge of the engagement head and the opening edge of the engagement recess, the area of collision contact between the engagement convex portion and the engagement head on the partner side of engagement can be reduced, and the slidability of the slider can be greatly improved.

Further, in the present invention, since the tip edge of the engagement head and the edge of the upper inclined surface on the tip edge side are arranged to be spaced apart from each other, the thickness of the opening edge of the engagement recess portion can be made thicker. Therefore, even if a moment generated by a lateral pulling force acts on the opening edge of the engagement recess, the amount of deflection of the opening edge of the engagement recess is smaller.

In the present invention, the lower inclined surface is formed on the inner peripheral surface of the engagement recess, so that the engagement convex portion of the mating object to be engaged can be easily accommodated in the engagement recess, and the engagement convex portion of the mating object to be engaged can be easily disengaged from the engagement recess.

Further, by configuring the inclination angle of the upper inclined surface to be shallower than the inclination angle of the lower inclined surface, the contact area of the lower inclined surfaces of the meshing convex portion and the meshing concave portion that are meshed can be configured to be wider, and the meshing state at the time of meshing can be configured to be stronger.

In this way, the thickness of the opening edge of the engagement recess portion can be made thick, and therefore, the rigidity of the opening edge of the engagement recess portion can be further improved. Further, the contact area of the lower inclined surfaces of the engagement convex portion and the engagement concave portion on the mating side to be engaged can be increased.

That is, the center of gravity of the engaging convex portion on the surface side where the engaging convex portion is engaged with the lower inclined surface of the engagement target can be positioned on the bottom surface side of the engaging concave portion of the engagement target with respect to the opening edge of the lower inclined surface. In other words, the engagement convex portion can be engaged with the engagement concave portion of the engagement target in a state where the waist portion is lower than the opening edge of the lower inclined surface.

Therefore, even if a rotational moment about the opening edge of the engagement concave portion acts on the engagement convex portion on the engaged counterpart side due to a lateral pulling force, the engagement convex portion on the engaged counterpart side can be prevented from rotating about the opening edge of the engagement concave portion of the engagement target, and the engaged state can be prevented from being separated.

In the present invention, the inclination angle of the upper inclined surface is preferably larger than 0 degrees and 7 degrees or less. More preferably, the angle is 3 to 7 degrees. By configuring the inclination angle of the upper inclined surface in such an angle range, the contact area of the lower inclined surfaces of the engaged engaging convex portion and the engaged engaging concave portion can be configured as an area capable of maintaining the engagement strength as a slide fastener.

If the inclination angle of the upper inclined surface is set to an angle larger than 7 degrees, the contact area of the lower inclined surface of the engaged engagement convex portion and the engaged engagement concave portion of the engagement target becomes narrow, and the engagement strength with respect to the lateral pulling force is weakened. In this case, the center of gravity of the engaging convex portion on the surface side in contact with the lower inclined surface of the engagement target among the engaging convex portions engaged with each other is located in the vicinity of the opening edge of the lower inclined surface of the engaging concave portion of the engagement target, or above the opening edge of the lower inclined surface.

That is, the engagement convex portion engages with the engagement concave portion of the engagement target in a state where the waist portion is higher than the opening edge of the lower inclined surface.

When the engaged engaging convex portion is engaged with the engaging concave portion of the engagement target in a state of a high waist, the engaged state is easily released when the lateral tensile force is exerted.

In the metallic one-sided tooth according to the present invention, when the lateral width dimension of the upper inclined surface in the lateral direction is set to be longer than 92% of the lateral width dimension of the bottom surface of the engagement recess, the lateral width dimension of the upper inclined surface is set to be wider, and the thickness of the upper portion side of the front end wall of the engagement head is set to be smaller. This causes the strength of the engaging recess to be insufficient, and the strength against the lateral tensile force to be reduced.

Further, when the lateral width dimension of the upper inclined surface in the left-right direction is set to be shorter than 89% of the lateral width dimension of the bottom surface of the engagement recess, the lateral width of the upper inclined surface is set to be narrow, and the area where the portions on both side end portions of the upper inclined surface of the engagement head collide with the engagement convex portion increases, which deteriorates the slidability of the slider.

Therefore, the lateral width dimension of the upper inclined surface in the lateral direction is set to a dimension range of 89% to 92% of the lateral width dimension of the bottom surface of the engagement recess portion in the lateral direction, and the strength of the front end wall of the engagement head portion is secured by securing the slidability of the slider satisfactorily, and therefore, it is a desirable configuration.

The metal single-sided engaging teeth according to the present invention can be used to manufacture a two-way slide fastener. With such a configuration, the slidability of the two sliders can be greatly improved, and a two-way slide fastener in which the engaged state is not released by the lateral pulling force can be configured.

Drawings

Fig. 1 is a perspective view of a metallic single-sided tooth according to the present invention.

Fig. 2 is a plan view of the engagement head and sectional views II-II and III-III of the engagement head.

FIG. 3 is a top view of the two-way zipper.

Fig. 4 is a sectional view of a main portion showing a state of engagement of the metallic single-sided tooth.

Fig. 5 is a main part sectional view showing a state where metal single-sided engaging teeth of conventional example 2 are engaged.

Fig. 6 is a perspective view showing a metallic single-sided tooth system according to conventional example 2.

Description of the symbols

1: metal single-side meshing teeth; 3: an engagement head; 4: an engaging projection; 5: an engagement recess; 5 a: an opening edge; 7: a front edge; 8: an upper inclined surface; 10 a: a lower inclined surface; 12: a bidirectional zipper; 14: a first slider; 15: a second slider; 33(33a, 33b, 33 c): an engagement head; 34(34a, 34b, 34 c): an engaging projection; 35(35a, 35b, 35 c): an engagement recess; 36(36a, 36b, 36 c): a front end wall; 37(37a, 37b, 37 c): a beveled surface; 38: a rib; 39(39a, 39b, 39 c): an opening edge.

Detailed Description

The best mode for carrying out the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and various modifications can be made as long as the present invention has substantially the same configuration as the present invention and can exhibit the same operational effects.

Examples

Fig. 1 is a perspective view of a metallic single-sided tooth according to the present embodiment. Fig. 2(a) is a plan view of the engaging head, and fig. 2(b) is a sectional view taken along line II-II of fig. 2 (a). FIG. 2(c) is a sectional view III-III in FIG. 2 (a). Fig. 3 is a plan view of a two-way slide fastener using a metallic single-sided tooth according to the present embodiment, and fig. 4 is a sectional view of a main portion of a state of engagement of the metallic single-sided tooth.

In the present invention, the front-rear direction of the metal single-sided teeth means a direction in the tape width direction when the metal single-sided teeth are attached to the fastener tape, and the left-right direction and the up-down direction of the metal single-sided teeth means a direction in the tape front-back direction and the tape longitudinal direction when the metal single-sided teeth are attached to the fastener tape, respectively.

The metallic single-sided tooth 1 according to the present embodiment shown in fig. 1 can be continuously manufactured by cutting a metallic wire material called a Y bar into a predetermined thickness and performing press working from the top-bottom direction on the meshing head 3 of the tooth after cutting. Alternatively, the metal single-sided tooth 1 according to the present embodiment shown in fig. 1 can be continuously manufactured by punching a metal plate at least once and piercing the punched metal plate in accordance with the outer peripheral shape of the metal single-sided tooth 1.

By the press working, the engaging convex portion 4 can be formed on one surface in the vertical direction of the engaging head portion 3, and the engaging concave portion 5 and the upper inclined surface 8 can be formed on the other surface. As will be described later, the lower inclined surface 10a and the upper inclined surface 8, which are the surfaces of the engagement head 3 on the leading edge side, have a simple shape that is continuous with each other on the inner peripheral surface 10 of the engagement recess 5. According to this configuration, the engagement recess 5 and the upper inclined surface 8 can be formed by at least one press working without preparing a plurality of press-worked dies.

As shown in fig. 1 and 2, a pair of right and left leg portions 2 are formed on the rear side of the metallic one-sided tooth 1, a meshing convex portion 4 (see fig. 2(b) and 2(c)) is formed on one surface side in the vertical direction of the metallic one-sided tooth 1 on the meshing head portion 3 on the front side of the metallic one-sided tooth 1, and a meshing concave portion 5 is formed on the other surface side.

An upper inclined surface 8 inclined downward is formed in the engagement recess 5 from the front end edge 7 side of the engagement head 3 on the other surface side of the metallic one-sided tooth 1. The upper inclined surface 8 may be formed by press working as described above, but may be formed on the side of the leading edge 7 of the coupling head portion 3 by cutting or grinding instead of press working. However, when the upper inclined surface 8 is formed by press working, work hardening can occur due to plastic deformation when the upper inclined surface 8 is formed, and the like, and therefore, the rigidity of the upper inclined surface 8 and the like can be improved.

The inner peripheral surface 10 of the engagement recess 5 has a mortar-like shape as shown in fig. 2(a) to 2(c), and is configured to be outwardly expanded from the bottom surface 5b of the engagement recess 5. Then, in the inner peripheral surface 10 of the engagement recess 5, the lower inclined surface 10a on the side of the distal end edge 7 of the engagement head 3 is connected to the upper inclined surface 8 at the opening edge 5a of the engagement recess 5.

As shown in fig. 2(b), the inclination angle α of the upper inclined surface 8 may be larger than 0 degrees by 7 degrees or less. It is preferable that the inclination angle α of the upper inclined surface 8 is set to an angle of 3 degrees or more and 7 degrees or less. Further, since the inclination angle α of the upper inclined surface 8 is made shallower than the inclination angle β of the lower inclined surface 10a, it is desirable that the inclination angle β of the lower inclined surface 10a is made an angle of 20 degrees or more and 30 degrees or less.

By setting the inclination angle β of the lower inclined surface 10a to an angle range of 20 degrees to 30 degrees, when a lateral pulling force acts on the engaged two-way slide fastener 1 shown in fig. 3, a part of the lateral pulling force can be released upward on the lower inclined surface 10a, and the lateral pulling force remaining after the release can be received by the lower inclined surface 10 a.

As shown in fig. 2(c), the dimension of the lateral width B of the upper inclined surface 8 can be set to a dimension 89% to 92% of the dimension of the lateral width a of the bottom surface 5B of the engagement recess 5. When the dimension of the lateral width a of the bottom surface 5B is set to be longer than 92% of the dimension of the lateral width B of the upper inclined surface 8, the lateral width B of the upper inclined surface 8 is set to be wider. Therefore, the wall thickness of the upper portion of the front end wall 6 of the engaging head 3 is reduced, and the strength of the engaging recess 5 is insufficient, and the strength against the lateral tensile force is reduced.

When the dimension of the lateral width a of the bottom surface 5B is set to be shorter than 89% of the dimension of the lateral width B of the upper inclined surface 8, the lateral width B of the upper inclined surface 8 is set to be narrow. Therefore, the area where the portions on both side end portions of the upper inclined surface 8 of the engagement head 3 collide with the engagement convex portion 4 increases, and the slider has poor slidability.

With such a configuration, when a lateral pulling force acts on the two-way slide fastener 1 shown in fig. 3, the contact area between the coupling convex portion 4 and the coupling concave portion 5 on the mating side which are coupled with the coupling concave portion 5 can be increased. According to this configuration, it is possible to prevent the engaging convex portion 4 on the mating side from being separated from the engaged state with the engaging concave portion 5 when the lateral pulling force acts, and to receive the lateral pulling force by the contact area between the engaging convex portion 4 and the engaging concave portion 5 on the mating side.

Then, by forming the contact area of the engaging convex portion 4 and the engaging concave portion 5 on the mating side to be wide, the tensile stress per unit area with respect to the lateral pulling force can be reduced. Further, the wall thickness of the front end wall 6 of the opening edge 5a of the engagement recess 5 can be made thick, and the rigidity of the opening edge 5a of the engagement recess 5 can be improved.

Further, even when a rotational moment about the opening edge 5a of the engaging recess 5 acts on the engaging convex portion 4 on the mating side engaged with the engaging recess 5 by a lateral tensile force, the contact area between the engaging convex portion 4 on the mating side engaged with the lower inclined surface 10a of the engaging recess 5 can be increased. Accordingly, the engaging convex portion 4 on the engaged counterpart side can be prevented from rotating in the separating direction about the opening edge 10a of the engaging concave portion 5, and the engaged state can be prevented from being separated.

The engaging convex portion 4 formed on the engaging head portion 3 abuts against the lower inclined surface 10a of the engaging concave portion 5 on the engaging side when the lateral pulling force is exerted. At this time, in order to increase the contact area between the inclined surface 4a of the meshing convex portion 4 that contacts the lower inclined surface 10a on the other side and the lower inclined surface 10a on the other side, the inclination angle of the inclined surface 4a of the meshing convex portion 4 may be set to an inclination angle that is substantially axisymmetrical to the inclination angle of the lower inclined surface 10a with respect to the vertical axis of the one-sided metal meshing tooth 1.

If the inclination angle α of the upper inclined surface 8 shown in fig. 2(b) is set to be larger than the above-mentioned angle of 7 degrees, the contact area of the mating-side engaging projection 4 with the lower inclined surface 10a becomes smaller when the lateral tensile force acts. Therefore, the rotational moment in the direction of separating the engaged state about the opening edge 5a of the upper inclined surface 8 and the lower inclined surface 10a of the opening edge which is the boundary between the upper surface of the engaged engaging head 3 and the engaging recess 5 is easily applied to the engaging head 3 on the other side, and the rotational moment about the opening edge 5a of the engaging recess 5 is easily generated, and the engaged state is easily separated.

As shown in fig. 1, 2(a) and (b), the front end edge 7 of the engagement head 3 and the end edge 8a on the front end edge 7 side of the upper inclined surface 8 are separated from each other. In the illustrated example, the separated portion is illustrated as a flat surface 9 by a flat surface, but the separated portion may be formed into a shape in which R processing is performed like a curved surface shape such as a part of a cylindrical surface. By providing the above-described separated portion, the wall thickness of the front end wall 6 of the opening edge 5a of the engagement recess 5 can be made thicker.

Further, even if the engagement convex portion 4 of the engagement partner collides against the front end edge 7 of the engagement head 3 during the engagement, the front end edge 7 of the engagement head 3 can be prevented from being deformed by the engagement convex portion 4 of the engagement partner because the engagement convex portion 3 is separated from the front end edge 7 of the engagement head 3 to the end edge 8a of the upper inclined surface 8.

Fig. 3 is a plan view of a two-way slide fastener in which the metallic single-sided element 1 shown in fig. 1 is attached to a core portion provided along a side edge of a fastener tape 13. A core portion of the fastener tape 13 is inserted between the left and right leg portions 2, 2 of the open leg of the metallic single-sided tooth 1 shown in fig. 1 (in fig. 1, the shape of the leg portion after the tape is swaged is shown), and then the left and right leg portions 2, 2 are pressed from the outer side surfaces thereof by using a swaging punch or the like to swage in a direction of narrowing the width of the open leg. Accordingly, the fastener tape 13 can be sandwiched between the left and right leg portions 2, and the metallic single-sided tooth 1 can be attached to the fastener tape 13.

As described above, the left and right fastener stringers 17 can be produced by implanting a plurality of metal single-sided teeth 1 according to the present invention at the tape side edge portions of the pair of left and right fastener tapes 13 at predetermined intervals. Further, the first slider 14 and the second slider 15 are inserted into the element rows of the obtained fastener stringer 17, and the upper stop 16a and the lower stop 16b are attached to both front and rear end portions in the sliding direction of the element rows, whereby the two-way slide fastener 12 shown in fig. 3 can be manufactured.

In the thus obtained two-way slide fastener 12, by sliding the first slider 14 in the direction toward the upper stop 16a and sliding the second slider 15 in the direction toward the lower stop 16b, the engaging convex portion 4 of each metal one-sided element 1 can be appropriately fitted into the engaging concave portion 5 of the mating object. Then, by sliding the first slider 14 or the second slider 15 in the opposite direction, the engaged state can be separated.

With reference to FIG. 4, the engaging state of the second slider 15 which is engaged gradually from the engaging convex portion 4 side is described, and at the time of engagement, the engaging convex portion 4-1 can be inserted into the engaging concave portion 5-0 through the vicinity of the upper inclined surface 8-0 formed on the engaging concave portion 5-0 of the engagement partner. Further, at the time of the engagement, the engaging head 3-1 is not brought into collision contact with the engaging protrusion 4-2 which is inserted gradually into the engaging recess 5-1 of the engaging head 3-1 next, and can be smoothly moved to the engaging position.

Then, since the upper inclined surface 8 is formed between the coupling concave portion 5 and the leading edge 7, the coupling convex portion 4 gradually inserted into the coupling concave portion 5 does not interfere with the coupling head 3 of the fitting destination, and the coupling head 3 itself is provided with the coupling convex portion 4 which is gradually inserted into the coupling concave portion 5 itself next, and the closure of the two-way slide fastener 12 can be smoothly performed.

Further, as shown in fig. 1, even if the upper inclined surface 8 is formed, the thickness of the front end wall 6 of the opening edge 5a of the meshing concave portion 5 can be made thick, and the length of the lower inclined surface in the vertical direction can be made long, so that even if the left and right metallic single-sided meshing teeth 1 receive an external force such as a lateral tensile force when in a meshing state, deformation or chipping of the meshing convex portion 4 and the meshing concave portion 5 can be effectively prevented.

Accordingly, the two-way slide fastener 12 of the present invention can stably secure excellent coupling strength.

In the two-way slide fastener 12 shown in fig. 3, the first slider 14 and the second slider 15 are arranged to face each other with their heads aligned, but the two-way slide fastener 12 of the present invention may be arranged to face each other with their tails aligned.

The present invention can be suitably used as a fastener element to be attached to an opening of a case, a garment, or the like.

Claims (8)

1. A metallic one-sided tooth system (1) having a convex engagement portion (4) formed on one surface side of a tooth head portion (3) and a concave engagement portion (5) formed on the other surface side,

an upper inclined surface (8) inclined downward is formed from the front end edge (7) side of the engagement head (3) into the engagement recess (5),

the metallic one-sided tooth is configured such that the inner peripheral surface (10) of the engagement recess (5) on the side of the leading end edge (7) of the engagement head (3) and the upper inclined surface (8) are connected.

2. The metallic single-sided tooth according to claim 1, wherein the upper inclined surface (8) is formed between a front end edge (7) of the engagement head (3) and an opening edge (5a) of the engagement recess (5).

3. The metallic single-sided tooth according to claim 2, wherein a front end edge (7) of the engagement head (3) and an end edge (8a) of the upper inclined surface (8) on the front end edge (7) side are disposed separately.

4. The metallic one-sided tooth according to claim 1, wherein an inner peripheral surface (10) of the engagement recess (5) connected to the upper inclined surface (8) is formed as a lower inclined surface (10a) that expands outward from a bottom surface (5b) of the engagement recess (5),

the inclination angle of the upper inclined surface (8) is configured to be smaller than the inclination angle of the lower inclined surface (10 a).

5. The metallic single-sided tooth according to claim 1, wherein the inclination angle of the upper inclined surface (8) is larger than 0 degrees and is 7 degrees or less.

6. The metallic single-sided tooth according to claim 5, wherein the inclined angle of the upper inclined surface (8) is 3 degrees or more and 7 degrees or less.

7. The metallic one-sided engaging tooth according to claim 1, wherein a width dimension of the upper inclined surface in the left-right direction is within a range of 89% to 92% of a width dimension of a bottom surface of the engaging recess portion in the left-right direction.

8. A two-way slide fastener comprising fastener stringers (17) formed by arranging metal single-sided teeth (1) according to any one of claims 1 to 7 at predetermined intervals on opposing side edge portions of a pair of right and left fastener tapes (13).