CN110482004B

CN110482004B - Rope belt fastener

Info

Publication number: CN110482004B
Application number: CN201910399856.3A
Authority: CN
Inventors: 南部円香
Original assignee: YKK Corp
Current assignee: YKK Corp
Priority date: 2018-05-15
Filing date: 2019-05-14
Publication date: 2021-03-23
Anticipated expiration: 2039-05-14
Also published as: JP2019198414A; CN110482004A; JP7083697B2

Abstract

The invention provides a rope fastener which can be reliably assembled by a simple structure and has good assembly operation efficiency, comprising: a housing member having a fitting portion on the inner side thereof, through which the string body is inserted; a piston member that presses the string body inserted into the fitting portion to the case member to hold the string body. The piston member has: a pair of leg portions along the insertion direction of the cord body; a head portion connecting tip portions of the pair of leg portions; and a connecting member for connecting the rear end portions of the two members on the opposite side of the head. A spring portion is provided between the legs to be extendable and retractable. One end of the spring part is connected to the head part, and the other end of the spring part reaches the vicinity of the connecting member, and is provided with a locking part fixed to a position of a predetermined insertion depth of the fitting part of the housing member. The connecting member is cut away in a portion of a shape projected on a surface intersecting the insertion direction of the string body, thereby exposing at least a portion of the engaging portion in the insertion direction.

Description

Rope belt fastener

Technical Field

The present invention relates to a strap fastener through which a strap body is inserted and which can be fixed to any position of the strap body.

Background

Conventionally, there is a rope fastener which is attached to an arbitrary position of a rope body and elastically held at a predetermined length by adjusting the length of extension of the rope body. Such a string fastening device is composed of a case member of a cylindrical body through which a string body is inserted in one direction, and a piston member inserted and assembled inside the case member.

For example, in a cord fastener disclosed in patent document 1, the piston portion is composed of a locking portion locked to one end portion of the cylindrical body of the housing member, a spring portion projecting from the locking portion in the insertion direction of the housing member and extending and contracting in the insertion direction, and a head portion provided at a tip end of the spring portion, and the head portion is provided with a holding projection for holding the cord body and an operation projection for holding the cord body when the head portion is moved. The case member is a cylindrical body formed by a top surface portion, a bottom surface portion, and a pair of side surface portions provided on both side edges in the left-right direction of the top surface portion and the bottom surface portion, one end portion of the cylindrical body is an insertion opening into which the piston is inserted and the engaging portion is engaged, and the other end portion is a drawing opening through which the head portion is elastically pressed to hold the string body and draw out the held string body. Further, an opening portion is formed to protrude outward so that the operation protrusion portion of the piston member can slide.

In the method of using the tether fastener, both end portions of the tether body folded in two are inserted into the insertion port from the pull-out port of the case member, the piston is inserted into the insertion port of the case member, and the piston is inserted between the pair of tether bodies for assembly. Thus, the holding projection of the head portion of the piston presses and bites into the string body to hold the string body, and the loop portion, which is the folded portion of the string body, projects outward from the draw-out opening of the case member. When the length of the loop portion of the cord body is changed, the operation protrusion provided on the head portion of the piston is operated to move the head portion in a direction away from the draw-out port against the urging force of the spring portion. Thus, the holding of the string body is released, the string body can slide, and the length of the loop portion of the string body can be changed.

However, in the string fastener disclosed in patent document 1, the operation protrusion is provided at the head of the piston, and the operability of assembling and adjusting the length of the string body is not good. Therefore, as another string fastening device, a pair of leg portions may be provided on the sides of the engaging portion of the piston portion and the spring portion. In this way, a pair of leg portions is provided along the insertion direction of the case member, and one end portion of the leg portion is connected to the head portion, and the other end portion is connected to a connection member provided separately from the outside of the locking portion, and is formed in a ring shape. Such a string fastener is easy to assemble to the case member, and has good operability of holding and releasing the string.

[ Prior art documents ]

[ patent document ]

[ patent document 1] U.S. patent publication No. US4878269A

In the latter case of the background art described above, in which the leg portion and the connecting member are provided to the piston portion, when the piston portion is assembled to the housing member, the piston portion is inserted from the insertion opening of the housing member with the head portion of the piston portion in front, and the connecting member is pressed and inserted, so that the locking portion is locked to the locked portion located at the predetermined insertion depth of the housing member. However, since the connecting member and the locking portion that perform the pressing operation are separated from each other, and the locking portion is connected to the head portion via the spring portion, even if the locking portion is pressed, the deformation of the spring portion absorbs the pressing amount, and it is difficult to reliably lock the locking portion to the locked portion of the housing main body. Therefore, in order to engage the engaging portion with the engaged portion, the connecting member must be pressed with a strong force, which makes the operation difficult, and often results in an incomplete engagement state, resulting in poor operation efficiency. Further, if the end of the engaging portion can be directly pressed and engaged with the engaged portion, the engaging portion can be reliably engaged, but the space between the engaging portion and the connecting member is narrow, and the pressing operation of the engaging portion is not possible.

Disclosure of Invention

The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide a string fastener which can be reliably assembled with a simple structure and which is excellent in the assembling operation efficiency.

The present invention provides a rope fastener, comprising: a housing member provided with a fitting portion in the inside thereof, through which the string body is inserted; and a piston member that presses the string body inserted into the fitting portion to the case member so as to hold the string body, the piston member being provided with: a pair of leg portions along an insertion direction of the cord body in the fitting portion; a head portion connecting respective tip portions of the pair of leg portions; a connecting member for connecting the rear end portions of the head portions on the opposite sides; and a spring portion formed between the pair of leg portions and extending and contracting in the insertion direction of the fitting portion, one end portion of the spring portion being connected to the head portion, the other end portion being connected to a locking portion fixed to a position of the case member corresponding to a predetermined insertion depth of the fitting portion, the piston member being inserted into the fitting portion of the case member, the locking portion being fixed at the predetermined insertion depth, the head portion being pressed against an inner peripheral surface of the fitting portion of the case member via the string body to hold the string body, and when the coupling member is pulled outward from this state, the head portion being separated from the inner peripheral surface to release the holding of the string body. The coupling member is a member in which a portion of a shape projected on a surface intersecting the insertion direction is cut away to expose at least a portion of the engaging portion in the insertion direction, and when the piston member is engaged with the engaging portion of the housing member, the engaging portion is moved to an engaging position at a predetermined insertion depth of the housing member by directly pressing the portion of the engaging portion exposed in the insertion direction, so that the piston member can be engaged with the housing member.

The engaging portion and the coupling member are members that are long in one direction intersecting with a direction of insertion into the fitting portion of the housing member, are substantially parallel to each other, are separated from each other in the insertion direction, have a space that opens in a direction intersecting with a longitudinal direction of the coupling member, and are exposed in the insertion direction.

The fitting portion of the case member is surrounded by a top surface portion and a bottom surface portion opposed to each other with a predetermined interval therebetween, and a pair of side surface portions located at side edge portions in the left-right direction of the top surface portion and the bottom surface portion and opposed to each other, and the top surface portion and the bottom surface portion have a locked portion to which the locking portion is locked.

The engaging portion is formed to face the top surface portion and the bottom surface portion, and a plurality of engaged fixing portions to which the engaging portion is engaged at a plurality of locations are provided on at least one of the top surface portion and the bottom surface portion.

The head portion is provided with a guide groove portion as a through hole for guiding the head portion in the insertion direction at a predetermined position of at least one of the top surface portion and the bottom surface portion.

The head portion is provided with a pair of guide protrusions that protrude and are inserted into the top surface portion and the bottom surface portion, and the pair of guide protrusions are movable inside the guide groove portion and the guide recess, and the movement direction and the movement length are restricted.

The cord fastener of the present invention has a simple structure, and when the piston member is assembled to the case member and held by the cord body, the cord fastener can be reliably locked to the case member by directly pressing the locking portion of the piston member. This makes it possible to easily and reliably assemble the string body together.

Drawings

Fig. 1 is an exploded perspective view of a tether fastener according to an embodiment of the present invention, as viewed from a bottom surface side.

Fig. 2 is an exploded perspective view of the string fastening device according to the present embodiment, as viewed from the top surface portion side.

Fig. 3 is a plan view (a), a left side view (b), a front view (c), and a bottom view (d) of the string fastening device of the present embodiment.

Fig. 4 is a longitudinal sectional view taken along line a-a of fig. 3.

Fig. 5 is a longitudinal sectional view taken along line B-B of fig. 3.

Fig. 6 is a plan view (a), a left side view (b), a front view (c), and a bottom view (d) of the piston member of the string tightener according to the present embodiment.

Fig. 7 is a top view (a), a left side view (b), a front view (c), and a bottom view (d) of a case member of the string fastening device of the present embodiment.

Fig. 8 is a rear view of the case member of the string fastening device of the present embodiment.

[ description of reference numerals ]

10: a rope fastener; 12: a piston member; 14: a housing component; 16: a foot portion; 18: a head portion; 20: a guide protrusion; 24: a connecting member; 26: a space; 28: a spring portion; 30: a card-holding section; 32: a locking claw; 40: a fitting portion; 42: a top surface portion; 44: a bottom surface portion; 46: a side surface portion; 48: an insertion opening; 50: a drawing port; 51: an inner peripheral surface; 54: a guide groove portion; 56: a locking claw fixing part; 58: a guide recess; 62: a rope belt body.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to fig. 1 to 8. The string fastener 10 includes: a case member 14 provided with a fitting portion 40 through which a cord body 62 described later is inserted in one direction; and a piston member 12 that is inserted into and locked to the fitting portion 40, and that presses the string member 62 against the case member 14 to hold the string member 62.

The piston member 12 is formed by integral molding of synthetic resin such as polyacetal, polyamide, or polypropylene. The piston member 12 is provided with a pair of leg portions 16 inserted into the case member 14, and the pair of leg portions 16 are columnar portions extending linearly in parallel with each other. In the following description, the direction in which the pair of leg portions 16 of the piston member 12 protrude is defined as the front-rear direction, and coincides with the insertion direction of the string member 62. The direction in which the pair of legs 16 face each other is referred to as a left-right direction, and the direction orthogonal to the front-back direction and the left-right direction is referred to as a front-back direction or a thickness direction. The leg portion 16 has a rectangular cross-sectional shape intersecting the longitudinal direction, i.e., the front-rear direction, and is a rectangle that is short in the left-right direction and long in the front-rear direction. The thickness in the front-back direction is not constant, and the one end portion 16a side is slightly wider.

The piston member 12 is provided with one head portion 18, and the one head portion 18 connects the short-thickness end portions 16b of the pair of leg portions 16 in the front-back direction, which are positioned in the longitudinal direction, to each other. The head 18 is a substantially isosceles triangle symmetrical about an imaginary line extending in the front-rear direction, and the end 16b of the leg 16 is connected to both ends of the base of the isosceles triangle. The thickness of the head portion 18 in the front-back direction is substantially constant, and a guide projection 20 is provided on an imaginary line passing through the center on the front and back surfaces of the head portion 18. The guide projection 20 projects outward in the front-back direction from the surface of the head 18, and the surface of the foot 16 on the opposite end 16a side is formed by a plane substantially parallel to the front-back direction and the left-right direction. Holding projections 22 are provided on the right and left oblique sides of the head portion 18. The holding projection 22 is triangular in shape when viewed from the front-back direction, and projects in a direction away from the apex angle, which is the tip of the head 18. Four holding projections 22, eight in total, are connected to the left and right of the head 18, respectively, and project in directions substantially parallel to each other. The tip end portion of the holding projection 22 is slightly rounded and has a certain shape in the front-back direction.

The portions of the ends 16b of the pair of legs 16 connected to the head 18 are slightly bent so as to approach each other. The width in the left-right direction is thinner from the portion where the bending starts to the head portion 18 than the other portions, and is easily elastically deformed.

The pair of legs 16 gradually widen toward both sides in the front-back direction as they approach an end 16a on the opposite side of the head 18, and the end 16a is formed to be the widest. One connecting member 24 is provided to the widest end portion 16a, and the end portions 16a are connected to each other via the connecting member 24. The coupling member 24 is a rod-shaped member that is long in the left-right direction. The pair of legs 16, the head 18, and the connecting member 24 are formed in a ring shape. The connecting member 24 is formed to have a thickness in the front-back direction smaller than the widest end portion of the leg portion 16, and is provided near one end in the front-back direction of the widest end portion 16a of the leg portion 16. A space 26 is formed in the other end edge portion in the front-back direction of the end portion 16a of the leg portion 16, in which the coupling member 24 is cut out in a concave shape in the front-back direction. The cut-out portion of the connecting member 24 forming the space 26 may be formed by cutting out a part of the shape of the connecting member 24 projected on a plane intersecting the insertion direction of the string body 62, specifically, a plane parallel to the front-back direction and the left-right direction. The connecting member 24 is formed to have a thickness in the front-back direction equal to or less than half of the thickness of the end 16a of the leg 16, and the space 26 is opened with a width slightly larger than the thickness of the connecting member 24 in the front-back direction, and is opened in the front-back direction and the front-back direction. This is a sufficient width for the operator to directly press the locking portion 30 by the finger.

Between the pair of leg portions 16, a spring portion 28 is provided. The spring portion 28 is disposed at the bottom edge of the head portion 18, extends along the foot portion 16 and reaches the vicinity of the connecting member 24. The spring portion 28 is a plate-like body having a constant thickness in the front-back direction and a small width in the left-right direction, and is bent and bent at three points in the longitudinal direction to have elasticity, and is easily elastically deformed particularly in the front-back direction.

A plate-shaped locking portion 30 that is long in the left-right direction is provided at an end portion of the spring portion 28 on the opposite side to the head portion 18, the end portion being located near the connecting member 24. The locking portion 30 is formed in a rectangular parallelepiped shape elongated in the right-left direction, and has a thickness substantially equal to the spring portion 28 in the front-back direction, and a width in the right-left direction larger than the spring portion 28 and shorter than the connecting member 24. The locking portion 30 is substantially parallel to the coupling member 24, is located slightly closer to the head portion 18 than the coupling member 24, and is separated from the coupling member 24. Therefore, the spring portion 28 and the locking portion 30 are located inside the loop formed by the pair of legs 16, the head 18, and the connecting member 24.

The spring portion 28 is connected to the surface of the locking portion 30 on the head portion 18 side, that is, the surface on the opposite side of the connecting member 24, at the center in the left-right direction, and both side portions of the surface in the left-right direction across the spring portion 28 slightly protrude toward the head portion 18. Two, four in total locking claws 32 protruding in the front-back surface direction are provided on each of the front and back sides of the locking portion 30 at both side portions in the left-right direction across the spring portion 28. The surface of the locking claw 32 on the connecting member 24 side is formed by a plane substantially parallel to the front-back direction and the left-right direction.

The case member 14 is also formed by integral molding of synthetic resin such as polyacetal, polyamide, or polypropylene. The housing member 14 has a hollow fitting portion 40 into which the piston member 12 is inserted. The fitting portion 40 is formed in a cylindrical shape by being surrounded by a top surface portion 42 and a bottom surface portion 44 which are opposed to each other with a predetermined gap therebetween, and a pair of side surface portions 46 which are positioned at lateral edges of the top surface portion 42 and the bottom surface portion 44 in the left-right direction and which are opposed to each other. As shown in fig. 4, the fitting portion 40 is a space in which the piston member 12 is fitted with a margin, and a gap is provided between the piston member 12 and the side surface portion 46 so as to sandwich a string body 62, which will be described later.

The opening of the case member 14 on the cylinder side is an insertion port 48 into which the piston member 12 is inserted, and the opening on the opposite side is a pull-out port 50 through which the head 18 of the piston member 12 is pressed to hold the string body 62 and pull out the held string body 62. The drawing port 50 is formed smaller than the insertion port 48.

The side edge portions 46a of the pair of side surface portions 46 forming the drawing port 50 are extended outward beyond the

side edge portions

42a and 44a of the top surface portion 42 and the bottom surface portion 44, and the side edge portions 46a of the pair of side surface portions 46 are connected to one another by a single attaching portion 52, and the side edge portions 46a are connected to each other by the attaching portion 52. The mounting portion 52 is a rod-shaped member that is long in the left-right direction. The mounting portion 52 is formed to have a thickness in the front-back direction smaller than the side edge portion 46a of the side surface portion 46 and is provided near the end of the side edge portion 46a connected to the side edge portion 44a of the bottom surface portion 44. The other end of the side edge portion 46a of the side surface portion 46 in the front-back direction is a space communicating with the drawing port 50. The thickness of the mounting portion 52 in the front-back direction is set to be equal to or less than half of the thickness of the side edge portion 46a of the side surface portion 46, and the width of the space in the front-back direction is slightly larger than the thickness of the mounting portion 52 in the front-back direction. This is a sufficient width through which the string body 62 pulled out from the pull-out port 50 passes.

The side edge 44a of the bottom surface 44 is provided with a guide groove 54 cut out in a rectangular shape. The guide groove portion 54 is a rectangle that is long in the front-rear direction. A guide recess 58 is provided at a position facing the guide groove 54 in the side edge 42a of the top surface portion 42. The guide recess 58 is provided by cutting a part of the thickness of the top surface portion 42 from the surface on the fitting portion 40 side, and has the same shape as the guide groove portion 54 and is rectangular long in the front-rear direction.

The locking claw fixing portion 56 is provided at a position of the top surface portion 42 and the bottom surface portion 44 close to the insertion port 48, and the locking claw fixing portion 56 is a fixed fixing portion to which the locking claw 32 of the piston member 12 is locked. The locking claw fixing portion 56 is a rectangular through hole into which the locking claw 32 is inserted and locked, and is formed to penetrate the top surface portion 42 or the bottom surface portion 44. The locking claw fixing portions 56 are provided in two, four in total, on the top surface portion 42 and the bottom surface portion 44, respectively.

Next, the locking operation of the string fastening device 10 according to the present embodiment will be described below. First, the string fastener 10 is attached to the vicinity of the opening of a bag or the like, not shown, and used. One string body 62 is inserted through the opening of the bag or the like along the peripheral edge, and both end portions 62a of the string body 62 are pulled out from the string holes or the like. The length of the both end portions 62a of the pull-out string body 62 is changed, thereby opening and closing the opening of the bag or the like.

As shown in fig. 3 to 5, the method of attaching the string fastener 10 is first to wind the string member 60 around the attachment portion 52 of the case member 14 before the piston member 12 is assembled, and to fix the end of the string member 60 near the string hole or the like in the opening of the bag or the like. Both end portions 62a of the string body 62 pulled out from the string hole or the like are put into the fitting portion 40 from the pull-out opening 50 and pulled out from the insertion opening 48 to the outside. The opposite end portions 62a of the pair of cord bodies 62 are respectively brought close to the ends in the left-right direction of the insertion port 48, and the piston member 12 is inserted between the pair of cord bodies 62 at the center of the insertion port 48 so that the head portion 18 thereof is forward. In the space 26 adjacent to the connecting member 24 of the piston member 12, the locking portion 30 connected to the spring portion 28 is exposed, and the locking claw 32 of the locking portion 30 is inserted into the locking claw fixing portion 56 of the case member 14 to be locked while the piston member 12 is placed on the rear side by pressing the locking portion 30 with a finger placed in the space 26.

The distance between the distal ends of the locking claws 32 positioned in the front-back direction of the piston member 12 is slightly longer than the distance between the inner surfaces of the top surface portion 42 and the bottom surface portion 44 of the case member 14, that is, the distance in the front-back direction of the fitting portion 40. Therefore, when the piston member 12 is placed in the fitting portion 40, the case member 14 is pressed by the locking claws 32 and expands in the front-back direction. When the locking claws 32 and the locking claw fixing portions 56 coincide, the locking claws 32 are inserted into the locking claw fixing portions 56, the elastic deformation of the case member 14 is restored, and the locking claws 32 do not come off the locking claw fixing portions 56. Since the surface of the locking claw 32 on the connecting member 24 side is formed by a flat surface perpendicular to the front-back direction and the front-back direction, even if the piston member 12 is biased in the withdrawal direction, the surface abuts against the inner surface of the locking claw fixing portion 56 and does not come off.

The spring portion 28 is provided long so that the locking claw 32 is positioned outside the locking claw fixing portion 56 at a position where the head portion 18 is pressed by the inner peripheral surface 51. Thus, when the locking portion 30 is pressed to lock the locking claw 32 to the locking claw fixing portion 56, the spring portion 28 is elastically deformed and contracted, and the head portion 18 is biased in a direction of coming into contact with the inner peripheral surface 51. Therefore, when the locking claws 32 of the piston member 12 are locked to the locking claw fixing portions 56 of the case member 14, the string member 62 is pressed against the inner peripheral surface 51 of the draw-out port 50 by the head portion 18 and is sandwiched, and the holding projections 22 abut against the string member 62, thereby holding and fixing the string member 62. Since the holding projection 22 projects in a direction away from the top corner of the head 18, the string body 62 does not slide in a direction of being pulled out from the pull-out opening 50, that is, in a direction of expanding the opening portion of the bag or the like. In addition, since the tip of the holding projection 22 is slightly rounded, the string body 62 is not damaged.

The guide protrusions 20 provided on both front and back sides of the head portion 18 of the piston member 12 are inserted into the guide recess 58 of the top surface portion 42, and the other is inserted into the guide groove portion 54 of the bottom surface portion 44. Since the guide groove portion 54 and the guide recess portion 58 are rectangular long in the front-rear direction, the guide projection 20 can move in the front-rear direction, and movement in the left-right direction is restricted. That is, the head 18 is movable in the front-rear direction, and movement in the left-right direction is restricted. The distance between the distal ends of the guide projections 20 in the front-back direction is slightly longer than the distance between the inner surfaces of the top surface portion 42 and the bottom surface portion 44 of the case member 14, that is, the distance between the front-back direction of the fitting portion 40. Therefore, when the piston member 12 is put into the fitting portion 40, the case member 14 is pressed by the guide projection 20 and expanded in the front-back direction. When the guide projection 20 is aligned with the guide groove portion 54 and the guide recess 58, the guide projection 20 is inserted into the guide groove portion 54 and the guide recess 58, the elastic deformation of the case member 14 is restored, and the guide projection 20 does not come off the guide groove portion 54 and the guide recess 58. Since the surface of the guide projection 20 on the side of the coupling member 24 is formed by a flat surface substantially parallel to the front-back direction and the left-right direction, even if the piston member 12 is biased in the pull-out direction, the surface abuts against the inner surfaces of the guide groove portion 54 and the guide concave portion 58 and does not come off.

A pull 64 having a belt shape or the like is attached to the coupling member 24 of the piston member 12. The handle 64 may be any of a rope belt, a flat object, and the like.

Thereby, the assembly of the piston member 12 and the case member 14 is completed, and the attachment of the string fastening device 10 to the opening of the bag or the like is completed. In the string fastening device 10, the loop portion of the string 62 along the opening of the bag or the like is extended from the drawing port 50, and both end portions 62a of the string 62 are extended from the insertion port 48.

Next, a method of using the string fastening device 10 will be described. When the opening of the bag or the like to which the string 62 is attached is narrowed and closed, the case member 14 is held by one hand, and both end portions 62a of the string 62 protruding from the insertion port 48 are pulled outward by the other hand. The string body 62 is held by being pressed by the holding projection 22, but since the holding projection 22 projects in a direction away from the vertex angle of the head 18, the string body 62 can slide outward from the insertion port 48 by being pulled by a strong force, the string body 62 on the pull-out port 50 side becomes short, and the opening of the pouch or the like can be contracted.

When the opening of the bag or the like is enlarged and opened, the handle 64 holding the piston member 12 with one hand pulls the bag or the like away from the bag or the like. Since the case member 14 is fixed to the bag, when the pull tab 64 of the piston member 12 is pulled, the piston member 12 is slightly pulled outward from the insertion port 48 of the case member 14, the spring portion 28 is elastically deformed and contracted, and the head portion 18 is separated from the inner peripheral surface 51 of the pull-out port 50, so that the string body 62 is in a slidable state. When the handle 64 of the piston member 12 is pulled with one hand, only the string body 62 is pulled out from the pull-out port 50 of the case member 14 due to the weight of the bag or the like, the string body 62 slides and becomes long, the opening portion of the bag or the like becomes large, and the article can be put in and out from the bag.

When the pull tab 64 is released from an arbitrary position of the string member 62, the piston member 12 returns to the fitting portion 40 of the case member 14 due to the elasticity of the spring portion 28, and the string member 62 is held, so that the opening of the bag can be held in an arbitrary size.

When the piston member 12 moves relative to the housing member 14, the guide projection 20 of the head portion 18 of the piston member 12 is guided by the guide groove portion 54 and the guide recess portion 58, and moves stably in the front-rear direction. Since the holding projection 22 projects in a direction away from the vertex angle of the head portion 18, when the opening portion of the bag or the like is contracted, the both end portions 62a of the string body 62 can be easily contracted by pulling with a strong force, and when the opening portion of the bag or the like is expanded, the string body 62 does not slip even if the opposite side of the string body 62 is pulled with a strong force, and therefore, it is safe. By pulling the piston member 12 from the housing member 14, the opening of the bag or the like can be enlarged, but the opening of the bag or the like is not enlarged inadvertently.

The string fastening device 10 may not be fixed to an article used for a bag or the like. The same procedure is followed even if not fixed. When enlarging the opening of a bag or the like, the opening of the bag is held with the other hand as needed.

According to the string fastener 10 of the present embodiment, the assembly can be reliably performed with a simple structure. When the piston member 12 is assembled to the case member 14 and the string body 62 is held, the locking portion 30 of the piston member 12 is directly pressed, and the piston member 12 can be reliably locked to the case member 14. That is, in the space 26 adjacent to the connecting member 24 of the piston member 12, the locking portion 30 connected to the spring portion 28 is exposed, and the locking can be performed by inserting the locking claws 32 of the locking portion 30 into the locking claw fixing portions 56 of the case member 14 while putting the piston member 12 to the rear side by putting fingers into the space 26 and pressing the locking portion 30. The housing member 14 can be locked more reliably than when the coupling member 24 is pressed and locked. Since the distance between the distal ends of the locking claws 32 positioned in the front-back direction of the piston member 12 is slightly longer than the distance in the front-back direction of the fitting portion 40 of the case member 14, when the piston member 12 is placed in the fitting portion 40, the piston member 12 and the case member 14 slide and friction occurs. When the connecting member 24 is pressed and locked, the spring portion 28 is expanded, and even if the spring portion is pressed near the mounting position, the locking claw 32 may not reach the locking claw fixing portion 56, but since the locking portion 30 can be directly pressed, the spring portion can be effectively pressed against the frictional force, the locking portion 30 is pressed to the mounting position, and the locking claw 32 can be reliably locked to the locking claw fixing portion 56.

Further, since the holding projection 22 projects in a direction away from the vertex angle of the head portion 18, when the opening portion of the bag or the like is reduced, the both end portions 62a of the string body 62 can be easily reduced by pulling with a strong force. On the other hand, when the opening of the bag or the like is enlarged, even if the annular portion of the string member 62 is pulled with a strong force, the string member 62 does not slip, and the opening of the bag or the like can be enlarged by pulling the piston member 12 from the case member 14, but the opening of the bag or the like is not enlarged carelessly, which is safe. Therefore, the operation of opening and closing the opening of the bag or the like is facilitated, and the use is facilitated.

When the piston member 12 is pulled from the housing member 14, the guide projection 20 provided on the head portion 18 of the piston member 12 moves inside the guide groove portion 54 and the guide recess 58, and therefore the movement in the front-rear direction is restricted and the stable sliding is possible. Further, the piston member 12 can be prevented from being pulled too strongly and from being detached, and the original position can be reliably returned when the pulling force is released. In addition, since the guide groove portion 54 is formed to penetrate the bottom surface portion 44, the mold is simple, the guide concave portion 58 and the guide groove portion 54 can be formed by one mold, and the mold can be pulled out and removed after molding.

The string fastener of the present invention is not limited to the above-described embodiments, and the shape of each member may be freely changed. The shape of the housing part 14 can also be as follows: the insertion port is made thin, and the piston member 12 is pulled while being pressed by a thumb and an index finger. The locking portion 30 preferably has a plurality of locking claws 32 protruding in the front-back surface direction on the front-back surface, but may have a configuration in which only one of the front-back surface has a plurality of locking claws 32, or may have a configuration in which a plurality of locking claws 32 are formed on one side in the left-right direction of the front-back surface. The shape and number of the holding projections 22 of the piston member 12, and the thickness and shape of the spring portion 28 can be set to an appropriate shape according to the thickness and rigidity of the string body. The article to which the strap fastener is attached may be any of a bag, clothing, cold protective gear, and the like. The direction in which the piston member is attached to the case member may be a direction in which the coupling member approaches the top surface side, or may be a direction in which the coupling member approaches the bottom surface side. Further, the guide groove portion may be provided in the bottom surface portion, and the guide concave portion may be provided in the top surface portion.

Claims

1. A strap fastener is provided with:

a housing member (14) provided with a fitting section (40) in the inside thereof, through which a string body (62) is inserted; and

a piston member (12) that presses the tether body (62) inserted into the fitting portion (40) to the case member (14) so as to hold the tether body (62),

the piston member (12) is provided with: a pair of leg portions (16) along the insertion direction of the cord body (62) in the fitting portion (40); a head (18) connecting the respective tip portions of the pair of legs (16); a connecting member (24) for connecting the rear end portions of the pair of leg portions (16) on the opposite side of the head portion (18); and a spring portion (28) formed between the pair of leg portions (16) and extending and contracting in the insertion direction of the fitting portion (40),

one end of the spring part (28) is connected to the head part (18), the other end is connected to a locking part (30), the locking part (30) is fixed at a position of the housing member (14) corresponding to a predetermined insertion depth of the fitting part (40),

inserting the piston member (12) into the fitting portion (40) of the case member (14), fixing the engaging portion (30) at a predetermined insertion depth, pressing the head portion (18) against the inner peripheral surface (51) of the fitting portion (40) of the case member (14) via the string body (62) to hold the string body (62), and releasing the holding of the string body (62) by separating the head portion (18) from the inner peripheral surface (51) when the connecting member (24) is pulled outward from this state, characterized in that the string fastener,

the coupling member (24) is a member in which a portion of a shape projected onto a surface intersecting the insertion direction is cut away so as to expose at least a portion of the engagement portion (30) in the insertion direction,

when the piston member (12) is locked to the fitting section (40) of the housing member (14), the locking section (30) is moved to a locking position of a predetermined insertion depth of the housing member (14) by directly pressing a portion of the locking section (30) exposed in the insertion direction, and the piston member can be locked to the housing member (14).

2. The strap fastener of claim 1,

the locking portion (30) and the connecting member (24) are members that are long in one direction intersecting the direction of insertion into the fitting portion (40) of the housing member (14), are substantially parallel to each other, and are separated from each other in the insertion direction,

a space (26) that opens in a direction intersecting the longitudinal direction of the coupling member (24) is formed in the coupling member (24), and the engagement portion (30) is exposed in the insertion direction.

3. The strap fastener of claim 1,

the fitting portion (40) of the case member (14) is provided so as to be surrounded by a top surface portion (42) and a bottom surface portion (44) that are opposed to each other with a predetermined interval therebetween, and a pair of side surface portions (46) that are positioned at lateral edges in the left-right direction of the top surface portion (42) and the bottom surface portion (44) and that are opposed to each other, and the top surface portion (42) and the bottom surface portion (44) have a locked portion (56) to which the locking portion (30) is locked.

4. The strap fastener of claim 3,

the locking part (30) is formed opposite to the top surface part (42) and the bottom surface part (44) respectively,

at least one of the top surface part (42) and the bottom surface part (44) is provided with a plurality of locked fixing parts (56) for locking the locking part (30) at a plurality of positions.

5. The lace fastener according to claim 3 or 4,

a guide groove (54) is provided at a predetermined position of at least one of the top surface section (42) and the bottom surface section (44) as a through hole for guiding the head section (18) in the insertion direction.

6. The strap fastener of claim 5,

a guide recess (58) formed by cutting out an inner surface of the head (18) in the insertion direction to a predetermined depth is provided at a predetermined position of the top surface portion (42),

the guide groove part (54) penetrating the bottom surface part (44) is arranged at a predetermined position of the bottom surface part (44) opposite to the guide concave part (58),

the head part (18) is provided with a pair of guide protrusions (20) which protrude and are inserted toward the top surface part (42) and the bottom surface part (44),

the pair of guide protrusions (20) can move inside the guide groove portion (54) and the guide recess portion (58), and the moving direction and the moving length are restricted.