Double-ended zipper

Abstract

The double-opening zipper (1) of the present application includes a pair of fastened chain rows (6) along the opposite side edge portions of a pair of tapes (5), a plug (7) and a seat rod (8) separately fixed to the rear end portions of the pair of tapes, and a front positive slider (3) and a rear negative slider (4) capable of moving forward and backward along the opposite side edge portions of the pair of tapes. The seat rod side chain row includes a plurality of chain rows (6a) of continuous chain rows (61) and a seat rod side independent chain row (21). The independent chain row is housed in the inside of the positive slider in a state where the plug is capable of being inserted and extracted in the positive slider and the negative slider, and is arranged between the seat rod side continuous chain row and the seat rod in a state where the seat rod side continuous chain row and the seat rod are respectively spaced apart in front and back. Since the spacing in front and back is provided, the tape on the seat rod side is easily deformed, so that the plug is easily inserted into the pair of sliders.

Description

Technical Field

[0001] This invention relates to a double-ended zipper, comprising: a pair of chain straps extending forward and backward and facing each other, capable of being opened and closed laterally; and a pair of zipper pulls movable forward and backward along the opposing side edges of the pair of chain straps, wherein the pair of zipper pulls open the pair of chain straps in opposite directions. Background Technology

[0002] As an example of existing double-ended zippers, there are known zippers that include a pair of zipper teeth, an opening pull for opening / closing the pair of zipper teeth, and a reverse opening pull (Patent Document 1, Patent Document 2).

[0003] The double-ended zipper of Patent Document 1 is described below. The zipper teeth on the bar side, along the opposing side edges of the zipper strip, sequentially include coil-shaped zipper teeth, an engagement reinforcement, and a bar. Furthermore, the zipper teeth and the engagement reinforcement are continuous; that is, the zipper teeth and the engagement reinforcement are integrated.

[0004] Furthermore, in the double-ended zipper of Patent Document 2, as described below, the zipper teeth on the bar side are continuously arranged with coil-shaped linear zipper teeth and the bar along the opposing side edges of the zipper strip. That is, the linear zipper teeth and the bar are integrated.

[0005] Furthermore, when the zipper bar is inserted or removed from a pair of zipper pulls, the end of the continuous zipper teeth on the bar side, i.e., the end on the side continuous with the bar, is located further towards the reverse zipper pull than the guide post of the forward zipper pull. That is, when the zipper bar is inserted or removed from a pair of zipper pulls, the end of the linear zipper teeth on the bar side is deeply inserted into the interior of the forward zipper pull.

[0006] Subsequently, when describing the double-ended zippers in Patent Document 1 and Patent Document 2, the zipper teeth are referred to as the toothed zipper belt, the zipper teeth and the linear zipper teeth are referred to as the coil teeth, the zipper belt is referred to as the belt, the zipper pull for opening in the forward direction is referred to as the forward zipper pull, and the zipper pull for opening in the reverse direction is referred to as the reverse zipper pull.

[0007] Furthermore, in the double-ended zippers of Patent Documents 1 and 2, the opposing side edges of the toothed chain on the side of the seat bar have a seat bar or coil chain teeth fixed on the chain. Therefore, compared with the part other than the opposing side edges (only the part of the chain), it has high rigidity and will become approximately a straight line as long as no force is applied.

[0008] Furthermore, the coil teeth are formed by multiple teeth continuously. Moreover, in the toothed chain band on the base bar side, coil teeth are fixed along the opposing side edges of the zipper band. Therefore, compared with toothed chain bands with multiple teeth that are not continuous, the shape of the opposing side edges of the zipper band is more likely to be a straight line.

[0009] Existing technical documents

[0010] Patent documents

[0011] Patent Document 1: International Publication No. 2010 / 089846

[0012] Patent Document 2: Japanese Patent No. 4762108 Summary of the Invention

[0013] The problem that the invention aims to solve

[0014] Furthermore, consider a pair of coil chain teeth engaging approximately half of their opposing side edges. In this state, the pair of coil chain teeth forms a portion that engages in a straight line and a portion that branches to the left and right. Moreover, the portion of the pair of coil chain teeth that engages in a straight line extends in a straight line relative to the forward slider towards the reverse slider side, while the portion of the pair of coil chain teeth that branches to the left and right separates to the left and right with the forward slider as the center. That is, the pair of coil chain teeth changes from a state in which they extend in a straight line parallel to each other inside the forward slider to a state in which they branch to the left and right.

[0015] The deformation indicates that a force was applied that rigidly resisted the coil chain teeth. Therefore, in the case where the insert detaches from the pair of pull tabs and the pair of chain teeth separate, the opposing side edges of the chain teeth become approximately a straight line due to the rigidity of the coil chain teeth.

[0016] Furthermore, in the reverse-opening slider of Patent Document 2, when the insert bar is inserted into a pair of sliders, as described above, the end of the coil chain tooth on the bar side is located further towards the reverse slider side than the guide post of the forward slider, and the coil chain tooth on the bar side is deeply inserted into the interior of the forward slider. Therefore, when inserting the insert bar into a pair of sliders, the coil chain tooth on the bar side must be deformed against its rigidity, making it difficult to insert the insert bar into the pair of sliders.

[0017] Furthermore, the so-called ideal posture for the forward and reverse zipper pulls with the insert pin inserted is when the forward and reverse zipper pulls are adjacent to each other and their guide posts are symmetrically positioned. In this posture, after inserting the insert pin into the pair of zipper pulls, the pair of chain straps can be closed simply by moving the forward zipper pull away from the reverse zipper pull. In the ideal posture of the pair of chain straps, the chain straps on the base side and the chain straps on the insert pin side are bent inside the forward zipper pull and branch to the left and right as they face forward relative to the forward zipper pull.

[0018] However, due to its rigidity, the coil chain teeth tend to be in a straight line. Therefore, before inserting the insert bar, the coil chain teeth on the bar side tend to extend in a straight line from the reverse pull head forward. Even when the forward and reverse pull heads are adjacent, the forward pull head tends to be tilted relative to the reverse pull head. The greater the tilt, the more difficult it is to insert the insert bar.

[0019] Furthermore, the relationship between the guide post (connecting post) and the coil chain teeth is not disclosed in the double-ended zipper disclosed in Patent Document 1 when the insert bar is inserted into a pair of zipper heads.

[0020] However, the double-ended zipper disclosed in Patent Document 1 has a structure in which the coil chain teeth and the meshing reinforcement on the side of the base bar are integrated as one piece and the integrated piece is separate from the base bar, which raises the issue that the insert bar is difficult to insert.

[0021] As mentioned above, both the double-ended zippers disclosed in Patent Document 1 and Patent Document 2 share the common problem of difficulty in inserting the insert rod.

[0022] This invention was created in consideration of the above-mentioned actual situation, and its purpose is to make it easy to insert the insert rod into a pair of zipper heads in a double-ended zipper.

[0023] Technical means to solve the problem

[0024] The double-ended zipper of the present invention includes: a pair of toothed zipper strips extending front to back and facing each other, closable from left to right; a forward zipper and a reverse zipper, movable back to front along opposing side edges of the pair of toothed zipper strips, wherein the forward zipper opens the pair of toothed zipper strips in a forward direction, and the reverse zipper opens the pair of toothed zipper strips in a backward direction. Furthermore, the pair of toothed zipper strips includes: a pair of strips extending front to back and facing each other from left to right; a pair of tooth rows comprising a plurality of teeth arranged in a front-to-back row and fixed along opposing side edges of the pair of strips, the pair of tooth rows being capable of engaging and disengaging cooperatively; and a insert and a seat, separately fixed to the rear ends of the pair of strips, wherein the insert and the seat allow the insert to be inserted and removed relative to the forward and reverse zipper strips when the forward and reverse zipper strips are adjacent to each other at the rear ends of the pair of strips. Moreover, the pair of tooth rows comprises a plurality of continuous tooth portions with teeth extending front to back. The double-ended zipper of the present invention is based on the above.

[0025] Furthermore, in the first form of the double-ended zipper of the present invention, the chain teeth row on the bar side includes, in addition to continuous chain teeth, independent chain teeth on the bar side capable of engaging and disengaging with the chain belt on the insert bar side. Each independent chain tooth on the bar side includes an independent chain tooth, which is one or more chain teeth fixed to the belt on the bar side. Moreover, the independent chain teeth at the rear end are housed inside the forward-facing zipper head when the insert bar can be inserted and removed from both the forward and reverse zipper heads. The independent chain teeth are arranged between the continuous chain teeth on the bar side and the bar, with a front-to-back upper gap relative to the continuous chain teeth on the bar side and the bar, respectively.

[0026] Furthermore, the first form of the double-ended zipper of the present invention does not limit whether the chain teeth row on the insert side only includes the continuous chain teeth portion on the insert side. However, in order to facilitate the insertion of the insert into the forward and reverse zipper heads, it is ideally designed as follows.

[0027] That is, the chain tooth row on the insert bar side includes not only the continuous chain tooth portion on the insert bar side, but also an independent chain tooth portion on the insert bar side that can engage and disengage with the chain belt on the seat bar side. Furthermore, the independent chain tooth portion on the insert bar side includes an independent chain tooth, which is one or more chain teeth fixed to the belt on the insert bar side. Moreover, the independent chain tooth at the rear end of the insert bar side is housed inside the forward pull head when the insert bar can be inserted and removed from both the forward and reverse pull heads. The independent chain tooth portion on the insert bar side is arranged between the continuous chain tooth portion on the insert bar side and the insert bar, and is spaced apart from the continuous chain tooth portion on the insert bar side and the insert bar respectively in a front-to-back upward space.

[0028] Furthermore, the first form of the double-ended zipper of the present invention is not limited to whether the independent chain teeth on the insert side can engage and disengage with the continuous chain teeth on the seat side when including the independent chain teeth on the insert side. However, in order to improve the connection strength when a pair of chain teeth are closed, it is ideally set as described below.

[0029] That is, the independent chain teeth at the rear end of the insert bar side can engage and disengage with the continuous chain teeth on the seat bar side and the independent chain teeth on the seat bar side.

[0030] Furthermore, the first form of the double-ended zipper of the present invention does not limit the structure of the individual chain teeth on the bar side in terms of their dimensions corresponding to the thickness direction of the belt. However, it is ideally designed as described below.

[0031] That is, the independent chain teeth on the base bar side include: a fixing part, a belt fixed to the base bar side; and an engaging part, which extends from the fixing part toward the belt on the insert bar side and engages with the chain teeth on the insert bar side. Regarding the dimension corresponding to the thickness direction of the belt, the thickness of the engaging part is thinner than the thickness of the fixing part.

[0032] Furthermore, the first form of the double-ended zipper of the present invention does not limit the structure of the individual chain teeth on the bar side. However, if the dimension between the fixing part of the individual chain teeth on the bar side and the continuous chain teeth part on the bar side is too wide, the forward or reverse zipper pull is prone to detaching from the excessively wide gap, which is undesirable. Therefore, in order to prevent the forward or reverse zipper pull from detaching from the chain teeth on the bar side, it is ideally designed as follows.

[0033] That is, the engaging portion of the independent chain tooth on the seat bar side includes: a neck that extends from the fixing portion toward the band on the insert bar side; and a head that extends from the neck toward the band on the insert bar side and protrudes forward and backward, wherein in the independent chain tooth on the seat bar side, the fixing portion extends further forward than the head.

[0034] Furthermore, the first configuration of the double-ended zipper of the present invention does not limit the manner in which the individual chain teeth on the base bar side can engage and disengage with the chain teeth on the insert bar side. However, in order to improve the connection strength when a pair of chain teeth are closed, it is ideally configured as follows.

[0035] That is, the engaging part of the independent chain tooth on the bar side includes: a neck that extends from the fixing part toward the bar side; and a head that extends from the neck toward the bar side and protrudes forward and backward, the head being able to engage and disengage with the chain tooth on the bar side.

[0036] The specific structure of the continuous chain tooth section or the specific structure of the independent chain tooth on the seat bar side is described below, for example.

[0037] That is, the independent chain teeth on the side of the seat bar are injection molded on the belt, and the continuous chain teeth are coil-shaped or sawtooth-shaped monofilaments that are bent in three dimensions.

[0038] In addition, the second form of the double-ended zipper of the present invention, in addition to having the premises described above, also has the following features: the forward zipper includes a guide post that guides a pair of continuous chain teeth in a state of left and right separation, and in the state of inserting and removing the insert bar in the forward zipper and the reverse zipper, the rear end of the continuous chain teeth on the bar side is located further forward than the rear end of the guide post.

[0039] The effects of the invention

[0040] If the double-ended zipper of the present invention includes independent chain teeth on the bar side, the portion between the independent chain teeth on the bar side and the bar, and the portion between the continuous chain teeth on the bar side and the independent chain teeth on the bar side, become flexible and easily deformable portions (hereinafter referred to as "deformable portions") due to the front and rear intervals in this gap, thus improving the flexibility of the opposing side edges of the chain strap on the bar side. Therefore, when the insert is inserted into the forward and reverse zipper heads, the independent chain teeth and continuous chain teeth on the bar side will tilt apart relative to a straight line direction of the bar, and the tilt of the forward zipper head relative to the reverse zipper head will be smaller. Moreover, in the state where the forward and reverse zipper heads are adjacent to each other at the rear ends of a pair of straps, the forward and reverse zipper heads can easily achieve an ideal vertically symmetrical posture, thus facilitating the insertion of the insert.

[0041] Furthermore, if the double-ended zipper of the present invention includes independent chain teeth on the insert bar side, for the same reason as when it includes independent chain teeth on the base bar side, when the insert bar is inserted into the forward and reverse zipper heads, the independent chain teeth and continuous chain teeth on the insert bar side will be separated and tilted relative to a straight line direction of the insert bar. With the forward and reverse zipper heads adjacent to each other at the rear ends of the pair of straps, this easily achieves an ideal symmetrical posture, thus facilitating the insertion of the insert bar. Moreover, in the double-ended zipper of the present invention, the independent chain teeth on the insert bar side can engage and disengage with the chain strap on the base bar side, thereby increasing the connection strength when the pair of chain straps are closed.

[0042] In the double-ended zipper of the present invention, if the rear end of the continuous chain teeth on the seat bar side is located further forward than the rear end of the guide post of the forward zipper when the insert bar is inserted into the forward zipper and the reverse zipper, then compared to, for example, the rear end of the continuous chain teeth on the seat bar side is located at the same or further backward as the rear end of the guide post, the continuous chain teeth on the seat bar side enter the forward zipper more shallowly. Even if the continuous chain teeth on the seat bar side do not deform much, it is easy to achieve an ideal front-to-back symmetrical posture when the forward zipper and the reverse zipper are adjacent to each other at the rear ends of a pair of straps. Therefore, the insert bar is easy to insert into a pair of zipper heads. Attached Figure Description

[0043] Figure 1 This is a plan view showing the overall double-ended zipper according to the first embodiment of the present invention.

[0044] Figure 2 This is a perspective view showing the main part of a pair of toothed chain straps in the double-ended zipper of the first embodiment.

[0045] Figure 3 It is a three-dimensional diagram showing the state of the independent chain teeth on the insert bar side and the independent chain teeth on the seat bar side from the rear and viewed from above.

[0046] Figure 4 It is a three-dimensional diagram showing the state of the independent chain teeth on the insert bar side and the independent chain teeth on the base bar side being viewed from the rear and from below.

[0047] Figure 5 (A) Figure 5 (D) represents the top view, front view, left side view, and bottom view of the independent chain tooth on the side of the base bar.

[0048] Figure 6 (A) Figure 6 (D) represents the top view, front view, left side view, and bottom view of the independent chain teeth on the insert side.

[0049] Figure 7 It is a cross-sectional view showing the state of the push rod being deeply inserted into the forward and reverse pull heads.

[0050] Figure 8 This is a cross-sectional view showing the initial insertion of the push rod into the forward and reverse pull heads.

[0051] [Explanation of reference numerals in the attached figures]

[0052] 1: Double-ended zipper

[0053] 2: Toothed chain strap

[0054] 3: Forward pull head

[0055] 4: Reverse pull head

[0056] 31, 41: Main body of the zipper pull

[0057] 32, 42: Film Analysis

[0058] 33, 43: Chain tooth passage

[0059] 33a, 43a: Meshing path

[0060] 33b, 43b: Branch paths

[0061] 34, 44: with grooves

[0062] 35, 45: Guide posts

[0063] 36, 46: Upper wing plate

[0064] 37, 47: Lower wingplate

[0065] 38, 48: Side panels

[0066] 38a, 48a: Flange

[0067] 39, 49: Tape installation section

[0068] 5: with

[0069] 5a: Core wire

[0070] 6: Chain teeth

[0071] 6a: Chain teeth

[0072] 61: Continuous chain tooth section

[0073] 61a: Upper foot

[0074] 61b: Lower foot

[0075] 61c: Engaging head

[0076] 61d: Joint

[0077] 7: Insert rod

[0078] 71: Insert body part

[0079] 73: Positioning Department

[0080] 74: Front concave part

[0081] 75: Corner

[0082] 76: Corner recess

[0083] 8: Seat stick

[0084] 81: Seat rod body part

[0085] 82: Anti-hair loss section

[0086] 83: Positioning Department

[0087] 9: Stop component

[0088] 10: Independent chain teeth on the insert side

[0089] 11: Independent chain teeth (chain teeth) on the insert side

[0090] 12: Fixing part

[0091] 12a, 12b, 12c: Upper surface

[0092] 12d, 12e: Lower surface

[0093] 12s: slot

[0094] 12t: Thickness

[0095] 13: Meshing part

[0096] 13t: Thickness

[0097] 14: Neck

[0098] 14a: Upper surface

[0099] 14d, 14e: Lower surface

[0100] 14t: Thickness

[0101] 15: Head

[0102] 15a, 15b: Upper surface

[0103] 15d, 15e, 15f, 15h: Lower surface

[0104] 15k: Frontend

[0105] 151: Head and Body

[0106] 152: lordosis

[0107] 153: Back convexity

[0108] 16: Shoulders

[0109] 16a: Upper surface

[0110] 16b: Backend

[0111] 16c: End on the side of the base rod

[0112] 17: Front concave part

[0113] 18: Rear concave part

[0114] 20: Independent chain tooth section on the side of the seat bar

[0115] 21: Independent chain teeth (chain teeth) on the side of the base bar

[0116] 22: Fixing part

[0117] 22a, 22b, 22c: Upper surface

[0118] 22d: Lower surface

[0119] 22s: slot

[0120] 22t: Thickness

[0121] 23: Engaging part

[0122] 23t: Thickness

[0123] 24: Neck

[0124] 24a: Upper surface

[0125] 24d: Lower surface

[0126] 24t: Thickness

[0127] 25: Head

[0128] 25a, 25b: Upper surface

[0129] 25d, 25e, 25f: lower surface

[0130] 25k: rear end

[0131] 251: head body

[0132] 252: front protrusion

[0133] 253: rear protrusion

[0134] 26, 27: shoulder part

[0135] 28: front recess

[0136] 29: rear recess

[0137] P: dimension of the fastener element in the front-rear direction

[0138] W: interval Detailed Description of the Embodiments

[0139] As shown Figure 1 , the double opening slide fastener 1 according to the first embodiment of the present invention includes: a pair of fastener stringers 2 extending in the front-rear direction and facing each other so as to be openable and closable in the left-right direction; and a normal slider 3 and a reverse slider 4, which are capable of moving back and forth along the opposing side edge portions of the pair of fastener stringers 2, wherein the moving direction of the normal slider 3 for opening the pair of fastener stringers 2 is the front direction, and the moving direction of the reverse slider 4 for opening the pair of fastener stringers 2 is the rear direction.

[0140] Regarding the fastener stringers 2, the so-called "opposing side edge portions" refer to the right edge portion in the case of the left fastener stringer 2, and refer to the left edge portion in the case of the right fastener stringer 2.

[0141] The pair of fastener stringers 2 includes, as its basic structure: a pair of tapes 5 extending in the front-rear direction and facing each other in the left-right direction; a pair of fastener element rows 6 respectively fixed along the opposing side edge portions of the pair of tapes 5, and capable of meshing and separating in a coordinated manner; an insert pin 7 and a base pin 8 separately fixed to the rear end portions of the pair of tapes 5; and a pair of stoppers 9 separately fixed to the front end portions of the pair of tapes 5.

[0142] Regarding the directions, in a state where the slide fastener 1 is placed on a flat surface, the directions are determined as follows.

[0143] The so-called "left-right direction" refers to the direction in which the pair of closed fastener stringers 2 face each other. The so-called "left direction" in the Figure 1 refers to the left direction. The so-called "right direction" in the Figure 1 refers to the right direction.

[0144] When describing the toothed chain band 2 on the insert bar side, it is sometimes referred to as the "base bar side" or "base bar opposite side" in the left-right direction. In this case, in this embodiment, since the left toothed chain band 2 includes the insert bar 7 and the right toothed chain band 2 includes the base bar 8, the term "base bar side" refers to the right side, and the term "base bar opposite side" refers to the left side. Furthermore, when describing the toothed chain band 2 on the base bar side, it is sometimes referred to as the "insert bar side" or "insert bar opposite side" in the left-right direction. In this case, in this embodiment, the term "insert bar side" refers to the left side, and the term "insert bar opposite side" refers to the right side.

[0145] Additionally, the term "front-to-back direction" refers to the direction in which a pair of toothed chain straps 2 extend when viewed from above. Figure 1 The center is a straight line, orthogonal to the left and right directions. The so-called "forward direction" is... Figure 1 "Middle" refers to the upward direction. The so-called "backward direction" is... Figure 1 "Middle" refers to the downward direction.

[0146] The "vertical direction" refers to the direction orthogonal to the front-back and left-right directions. The "up direction" refers to... Figure 1 The "center" refers to the direction perpendicular to the paper, pointing towards the front. The "downward direction" refers to... Figure 1 The center refers to the direction that faces inwards from the direction perpendicular to the paper.

[0147] The belt 5 is a strip that extends from front to back, with its thickness directed vertically. Furthermore, the belt 5 is more flexible than the pair of chain teeth 6, inserts 7, and base bars 8. Therefore, the belt 5 can deform freely in all parts except for the opposing side edges (the portions not secured with the pair of chain teeth 6, inserts 7, and base bars 8).

[0148] A pair of stoppers 9 determine the front limit position of the forward slider 3's movement range by colliding with it. The front limit position of the reverse slider 4's movement range is determined by the collision between the reverse slider 4 and the forward slider 3.

[0149] like Figure 1 or Figure 2 As shown, the base bar 8 includes: a base bar body portion 81 extending in the front-rear direction; and an anti-detachment portion 82 extending from the rear end of the base bar body portion 81 toward the opposite side of the insert bar, and preventing the reverse pull head 4 from falling off. In addition, the base bar 8 is fixed to the opposite side edge portion of the strap 5 in a state that covers the upper and lower surfaces and the left surface (the surface on the insert bar side) of the opposite side edge portion of the strap 5.

[0150] Furthermore, the rear limit position of the reverse slider 4 within its range of movement is determined by the collision between the reverse slider 4 and the anti-slip part 82. The rear limit position of the forward slider 3 within its range of movement is determined by the collision between the forward slider 3 and the reverse slider 4.

[0151] The insert 7 includes an insert body portion 71 extending in the front-rear direction. Furthermore, the insert 7 is fixed to the opposing side edges of the belt 5, covering the upper and lower surfaces and the right side (the side facing the base) of the opposing side edges. When the forward pull head 3 and the reverse pull head 4 are adjacent to each other at the rear ends of a pair of belts 5, the insert 7 can be inserted and removed relative to the forward pull head 3 and the reverse pull head 4. In this case, the reverse pull head 4 is positioned at its rearmost limit position.

[0152] The insert rod 7 and the seat rod 8 each include a pair of positioning portions 73 and 83 that position each other. In this embodiment, the positioning portion 83 of the seat rod 8 is a protruding piece that protrudes from the insert rod side surface of the seat rod body portion 81, and the positioning portion 73 of the insert rod 7 is a receiving recess that is recessed into the seat rod side surface of the insert rod body portion 71 and receives the positioning portion 83.

[0153] like Figure 1 As shown, the forward-moving zipper 3 can move back and forth along the opposing side edges of a pair of toothed chains 2. Moreover, the forward-moving zipper 3 includes: a zipper body 31 that guides a pair of chain teeth 6 in a manner that allows them to engage and disengage; and a pull tab 32 connected to the zipper body 31.

[0154] like Figure 7 , Figure 8 As shown, the internal space of the zipper head body 31 includes: a tooth passage 33 that runs through the front and back direction and allows a pair of tooth rows 6 to pass through; and a pair of belt grooves 34 that connect the tooth passage 33 to the outside of the zipper head body 31 in the left and right directions and allow a pair of belts 5 to pass through.

[0155] The chain tooth passage 33 includes: an engagement path 33a, through which a pair of chain tooth rows 6 pass in an engaged state; and a pair of branch paths 33b, which branch to the left and right as they move forward from the engagement path 33a, and through which a pair of chain tooth rows 6 pass in a separated state.

[0156] The zipper pull body 31 includes: a guide post 35, configured to extend vertically between a pair of branch paths 33b, and guiding a pair of chain teeth 6 in a left-right separated state; an upper wing plate 36 (see reference). Figure 1 The lower wing plate 37 faces the guide post 35 and divides the upper and lower parts of the chain tooth passage 33; and the left and right side plates 38 divide the chain tooth passage 33 to the left and right with the guide post 35 as the center.

[0157] On the left and right side plates 38, grooves 34 are formed in a continuous manner along the front-rear direction. The portion of the left and right side plates 38 divided vertically by the grooves 34 is called a flange 38a. The flange 38a extends from the left and right edges of the upper flange 36 and the lower flange 37 in a direction that approaches each other.

[0158] Additionally, the zipper pull body 31 includes raised portions 35a at the upper and lower ends of the guide post 35, which rise from the upper wing plate 36 and the lower wing plate 37 toward each other. The raised portions 35a locally narrow the vertical spacing of the chain tooth passage 33, extending along the left and right sides of the guide post 35 and toward the rear of the guide post 35.

[0159] In addition, such as Figure 1 As shown, the zipper head body 31 includes a zipper mounting portion 39 protruding from the upper surface of the upward-facing wing plate 36. A zipper 32 is connected to the zipper mounting portion 39.

[0160] The reverse zipper pull 4 is symmetrical to the forward zipper pull 3. Therefore, the structure of the reverse zipper pull 4 will be described in a simplified manner.

[0161] The reverse zipper puller 4 includes a zipper puller body 41 and a pull tab 42. The internal space of the zipper puller body 41 includes a chain tooth passage 43 and a pair of grooves 44. The chain tooth passage 43 includes an engagement path 43a and a pair of branch paths 43b. The zipper puller body 41 includes a guide post 45, an upper wing plate 46, a lower wing plate 47, left and right side plates 48, a raised portion 45a, and a pull tab mounting portion 49. Grooves 44 are formed in the left and right side plates 48. The portion of the left and right side plates 48 divided vertically by the grooves 44 is called a flange 48a.

[0162] A pair of chain teeth, row 6, contains multiple chain teeth arranged in a row in the front-to-back direction. Furthermore, as... Figure 2 As shown, a pair of chain teeth 6 each includes a plurality of chain teeth 6a and a continuous chain tooth portion 61 in the front-back direction.

[0163] The continuous chain tooth section 61 is a single synthetic resin filament bent in three dimensions (up and down, left and right, front and back). Each filament is a unit chain tooth 6a that engages with opposing filaments, forming a continuous chain tooth. Therefore, the continuous chain tooth section 61 includes a plurality of continuous chain teeth 6a in the front-back direction. Furthermore, the chain teeth 6a of the continuous chain tooth section 61 can engage and disengage with the chain teeth 6a of another opposing continuous chain tooth section 61. The filament is either coil-shaped or serrated. The filament is sometimes referred to as a coil chain tooth or a serrated chain tooth, corresponding to its bent shape. Incidentally, as... Figure 2 As shown, in this embodiment, the monofilament is a coil chain tooth and is wound in the form of a core wire 5a that extends in a straight line in the front-back direction.

[0164] Incidentally, the chain tooth 6a of the coil chain includes, as is known, an upper leg 61a and a lower leg 61b facing each other in the vertical direction; an engagement head 61c that engages the ends of the upper leg 61a and the lower leg 61b on one side of the opposing continuous chain tooth portion 61 at the left and right ends, and engages with the chain tooth 6a of the opposing continuous chain tooth portion 61; an upper engagement portion 61d, at the end opposite to the engagement head 61c at the left and right ends, engages the upper leg 61a with the lower leg 61b of one of the chain teeth 6a at the front and rear ends; and a lower engagement portion 61d, at the end opposite to the engagement head 61c at the left and right ends, engages the lower leg 61b with the upper leg 61a of the other chain tooth 6a at the front and rear ends. Moreover, the engagement head 61c extends vertically to engage the upper leg 61a and the lower leg 61b. Furthermore, the middle portion of the engaging head 61c protrudes forward and backward in the vertical direction to insert and engage between the upper leg portion 61a and the lower leg portion 61b of the chain tooth 6a of the opposing continuous chain tooth portion 61. In addition, the continuous chain tooth portion 61 is fixed to the opposing side edge portion of the belt 5 by means of a sewing thread (not shown).

[0165] In addition to the continuous chain tooth portion 61, the chain tooth row 6 on the insert bar side also includes an independent chain tooth portion 10 on the insert bar side, which is independent of the continuous chain tooth portion 61 and the insert bar 7. In this embodiment, the independent chain tooth portion 10 on the insert bar side includes an independent chain tooth 11, which is a chain tooth 11 fixed to the side edge of the belt 5 on the insert bar side. The continuous chain tooth portion 61 includes continuous chain teeth 6a in the front-back direction, the independent chain tooth portion 10 on the insert bar side includes one chain tooth 11, and the chain tooth row 6 on the insert bar side includes a plurality of chain teeth (a plurality of chain teeth 6a and one chain tooth 11) arranged in a row in the front-back direction. Moreover, since the independent chain tooth portion 10 on the insert bar side includes one independent chain tooth 11, the independent chain tooth 11 is the rearmost independent chain tooth 11 in the independent chain tooth portion 10 on the insert bar side.

[0166] The chain tooth row 6 on the base bar side includes not only the continuous chain tooth portion 61, but also an independent chain tooth portion 20 on the base bar side that is independent of the continuous chain tooth portion 61 and the base bar 8. In this embodiment, the independent chain tooth portion 20 on the base bar side also includes an independent chain tooth 21, which is a chain tooth 21 fixed to the belt 5 on the base bar side. The continuous chain tooth portion 61 includes continuous chain teeth 6a in the front-back direction, the independent chain tooth portion 20 on the base bar side includes one chain tooth 21, and the chain tooth row 6 on the base bar side includes multiple chain teeth (multiple chain teeth 6a and one chain tooth 21) arranged in a row in the front-back direction. Moreover, since the independent chain tooth portion 20 on the base bar side includes one independent chain tooth 21, the independent chain tooth 21 is the rearmost independent chain tooth 21 in the independent chain tooth portion 20 on the base bar side.

[0167] The independent chain teeth 21 on the base bar side can engage and disengage with the toothed chain band 2 on the insert bar side. More specifically, in this embodiment, they can engage and disengage with the independent chain teeth 11 on the insert bar side and the insert bar 7. Furthermore, the independent chain teeth 21 on the base bar side are arranged between the continuous chain tooth portion 61 on the base bar side and the base bar 8, spaced apart in the front-rear direction from the continuous chain tooth portion 61 and the base bar 8 respectively. Since the continuous chain tooth portion 61, the independent chain teeth 21, and the base bar 8 are fixed on the band 5, although the opposing side edges of the toothed chain band 2 on the base bar side are intended to form a straight line, the spaced portions before and after the independent chain teeth 21 become easily deformable portions.

[0168] The independent chain teeth 11 on the insert bar side can engage and disengage with the toothed chain band 2 on the base bar side. More specifically, in this embodiment, they can engage and disengage with the continuous chain teeth 61 on the base bar side and the independent chain teeth 21 on the base bar side. Furthermore, the independent chain teeth 11 on the insert bar side are arranged between the continuous chain teeth 61 and the insert bar 7, spaced apart in the front-rear direction from the continuous chain teeth 61 and the insert bar 7, respectively. Since the continuous chain teeth 61, the independent chain teeth 11, and the insert bar 7 are fixed on the band 5, although the opposing side edges of the toothed chain band 2 on the insert bar side are intended to form a straight line, the spaced portions before and after the independent chain teeth 11 become easily deformable portions.

[0169] Both the independent chain teeth 11 on the insert bar side and the independent chain teeth 21 on the base bar side are blocks made of synthetic resin and directly injection molded onto the corresponding side of the belt 5. Each of these blocks is longer than one chain tooth 6a of the continuous chain tooth section 61 in the front-to-back direction. The structure of the independent chain teeth 11 on the insert bar side and the independent chain teeth 21 on the base bar side will be described in detail below.

[0170] The independent chain teeth 11 on the insert bar side include: a fixing part 12, which is fixed to the belt 5 on the insert bar side; and an engaging part 13, which extends from the fixing part 12 toward the belt 5 on the seat bar side and engages with the chain teeth 2 on the seat bar side.

[0171] The fixing part 12 is fixed to the upper and lower surfaces of the belt 5 in a state where it clamps the opposing side edges of the belt 5 from above and below. More specifically, the core wire 5a, which passes through the inside of the coil teeth of the continuous chain tooth part 61, extends rearward relative to the coil teeth and is fixed to the opposing side edges of the belt 5 by means of stitching (not shown). Moreover, the opposing side edges of the belt 5 and the core wire 5a overlapping thereon pass through the fixing part 12 in the front-rear direction and are housed in the insert 7. In addition, in Figure 3 , Figure 4 , Figure 6For convenience, the strip 5 and core wire 5a are omitted from the fixing part 12. Instead, the portion containing the strip 5 and core wire 5a is referred to as groove 12s. Groove 12s is formed so as to penetrate the surface opposite to the seat bar in the fixing part 12 in the front-to-back direction. Furthermore, regarding the dimensions in the vertical direction, the dimension of groove 12s on the seat bar side is wider than the dimension on the opposite side of the seat bar, as is well known, in order to prevent the individual chain teeth from detaching from the strip 5. In addition, the fixing part 12 is approximately rectangular in shape when viewed from the vertical direction.

[0172] like Figure 6 As shown, the upper surface 12a of the upper surface of the fixing part 12 on the side of the seat rod is an inclined surface that decreases in elevation towards the seat rod side. The upper surface 12c of the upper surface of the fixing part 12 on the opposite side of the seat rod is an inclined surface that decreases in elevation towards the opposite side of the seat rod. The upper surface 12b of the middle part in the left-right direction of the upper surface of the fixing part 12 is a plane that is the highest in the upper surface of the fixing part 12 and is orthogonal to the up-down direction.

[0173] The lower surface 12d of the lower surface of the fixing part 12 on the side of the seat rod is a plane that is the lowest point on the lower surface of the fixing part 12 and is orthogonal to the vertical direction. The lower surface 12e of the lower surface of the fixing part 12 on the side opposite to the seat rod is an inclined plane that increases in height as it moves towards the opposite side of the seat rod. The vertical dimension of the lowest and highest parts of the fixing part 12 is the thickness 12t of the fixing part 12.

[0174] The engaging portion 13 includes: a neck 14 extending from the fixing portion 12 toward the seat bar side of the belt 5; a head 15 extending from the neck 14 toward the seat bar side of the belt 5 and protruding forward and backward; and a shoulder 16 extending rearward from the rear surface of the neck 14.

[0175] The neck 14 extends from the middle part of the fixing part 12 in the front-back direction toward the belt 5 (seat side) on the seat side.

[0176] The upper surface 14a of the neck 14 is a plane that is stepped down from the highest part of the upper surface of the fixing part 12 and is orthogonal to the vertical direction.

[0177] The lower surface 14d of the neck 14 on the fixing part side (opposite to the base bar) is a plane orthogonal to the vertical direction and is formed at the same height as the lower surface of the fixing part 12 on the base bar side. The lower surface 14e of the neck 14 on the base bar side is an inclined surface that increases in height as it moves toward the base bar side.

[0178] Furthermore, the vertical dimension of the lowest and highest parts of the neck 14 is equal to the thickness 14t of the neck 14. Moreover, the thickness 14t of the neck 14 is thinner than the thickness 12t of the fixing part 12, and in this embodiment, it is the thickest part of the engaging part 13, which is also the thickness 13t of the engaging part 13.

[0179] The head 15 includes: a head body 151 extending from the neck 14 toward the base bar side; a forward protrusion 152 protruding from the head body 151 to a position further forward than the neck 14 and engaging with a rear-end chain tooth 6a in a continuous chain tooth portion 61 on the base bar side; and a rear protrusion 153 protruding from the head body 151 to a position further rear than the neck 14 and engaging with an independent chain tooth 21 on the base bar side.

[0180] The upper surface 15a of the head 15 decreases in a stepped manner compared to the highest part of the upper surface of the fixing part 12, and the lower surface 15d of the head 15 decreases in a stepped manner compared to the lowest part of the lower surface of the fixing part 12. Therefore, the thickness 15t of the head 15 is thinner than the thickness 12t of the fixing part 12. The upper surface 15b of the front portion of the upper surface 15a of the head 15 is a slope that decreases as it faces forward.

[0181] In the lower surface 15d of the head 15, the lower surface 15e of the central part in the front-rear direction of the lower surface of the base rod side is set as an inclined surface that increases in height as it moves toward the base rod side, and the lower surface 15f of the front part and the lower surface 15h of the rear part in the front-rear direction of the lower surface of the base rod side are set as planes that increase in height in a stepped manner compared to the lower surface 15e (inclined surface) of the central part in the front-rear direction, and are orthogonal to the vertical direction at the same height.

[0182] The lower surface 15f of the front part in the front-back direction is the lower surface of the front protrusion 152. The lower surface 15h of the rear part in the front-back direction is a part of the lower surface of the rear protrusion 153 and a part of the lower surface of the head body 151 (top of the seat bar side), and the front end 15k (front side) of the lower surface 15h is inclined forward as it faces the seat bar side.

[0183] Additionally, the forward protrusion 152, the neck 14, and the fixing portion 12 form left and right forward recesses 17 covering the front side relative to the neck 14. The forward recesses 17 are formed by recessing the front surface of the independent chain teeth 11 on the insert side. The forward recesses 17 open forward and extend through in the vertical direction.

[0184] Furthermore, the front recess 17 and the front protrusion 152 engage with the rear end of the chain tooth 6a in the continuous chain tooth portion 61 on the seat bar side. More specifically, the rear portion of the engaging head 61c of the rear end of the chain tooth 6a in the continuous chain tooth portion 61 on the seat bar side is received in the front recess 17. The front protrusion 152 is inserted between the upper leg portion 61a and the lower leg portion 61b of the rear end of the continuous chain tooth 6a in the continuous chain tooth portion 61 on the seat bar side.

[0185] The rear protrusion 153, the neck 14, and the fixing part 12 form left and right rear recesses 18 covering the rear side relative to the neck 14. The rear recesses 18 are formed by recessing the rear surface of the independent chain teeth 11 on the insert side. In addition, the rear recesses 18 are open to the rear and upward and are blocked by the shoulder 16 below.

[0186] In the front-to-back direction, the shoulder 16 protrudes from the fixing part 12, the neck 14, and the head 15 on the rear side relative to the neck 14. In the vertical direction, the shoulder 16 protrudes from the lower part of the fixing part 12, the neck 14, and the head 15.

[0187] The upper surface 16a of the shoulder 16 is a plane orthogonal to the vertical direction and is at the same height as the lower surface 15f of the front portion and the lower surface 15h of the lower surface 15d of the head 15. The lower surface 16d of the shoulder 16 is a plane orthogonal to the vertical direction and is at the same height as the lower surface 15d of the head 15. Furthermore, the rear end 16b of the shoulder 16 is inclined forward as it faces the base. Additionally, the end 16c of the shoulder 16 that is on the base side in the left-right direction is located on the side opposite to the base in the rear protrusion 153.

[0188] like Figure 1 As shown, the independent chain tooth 21 on the base bar side includes: a fixing part 22, which is fixed to the belt 5 on the base bar side; and an engaging part 23, which extends from the fixing part 22 toward the belt 5 on the insert bar side and engages with the chain tooth belt 2 on the insert bar side.

[0189] The fixing part 22 is fixed to the upper and lower surfaces of the belt 5 in a state where it clamps the opposing side edges of the belt 5 from above and below. Furthermore, the opposing side edges of the belt 5 and the core wire 5a overlapping thereon pass through the fixing part 22 in the front-to-back direction and are housed within the seat bar 8. Figures 3-5 For convenience, the band 5 is omitted from the fixing part 22, and the portion where the band 5 is disposed is referred to as groove 22s instead of band 5. Groove 22s is formed in such a way that it penetrates the surface opposite to the insert rod in the fixing part 22 in the front-to-back direction. Furthermore, regarding the dimensions in the vertical direction, groove 22s makes the dimension on the insert rod side wider than the dimension on the opposite side of the insert rod.

[0190] like Figure 5 As shown, the upper surface 22a of the upper surface of the fixing part 22 on the side of the insertion rod is an inclined surface that decreases in elevation towards the insertion rod side. The upper surface 22c of the upper surface of the fixing part 22 on the side opposite to the insertion rod is an inclined surface that decreases in elevation towards the opposite side of the insertion rod. The upper surface 22b of the middle part in the left-right direction of the upper surface of the fixing part 22 is a plane that is the highest in the upper surface of the fixing part 22 and is orthogonal to the up-down direction.

[0191] The lower surface 22d of the fixing part 22 is a plane orthogonal to the vertical direction. The vertical dimension of the lowest and highest parts of the fixing part 22 is the thickness 22t of the fixing part 22.

[0192] The corner 22h between the right surface of the fixing part 22 (the side opposite to the insertion rod) and the rear surface is set as an inclined surface that faces forward as it faces the side opposite to the insertion rod. For example... Figure 1 As shown, the corner portion 22h faces the front surface of the base rod 8. The distance between the corner portion 22h and the front surface of the base rod 8 widens as it faces the opposite side of the insertion rod.

[0193] The engaging portion 23 includes: a neck 24 extending from the fixing portion 22 toward the insert rod side of the band 5; a head 25 extending from the neck 24 toward the insert rod side of the band 5 and protruding forward and backward; and a pair of shoulders 26, 27 extending forward and backward from the front and rear surfaces of the neck 24.

[0194] The neck 24 extends from the rear of the fixing part 22 toward the strip 5 (insertion rod side) on the insertion rod side.

[0195] The upper surface 24a of the neck 24 is a plane that is stepped down from the highest part (plane) of the upper surface of the fixing part 22 and is orthogonal to the vertical direction.

[0196] The lower surface 24d of the neck 24 is a slope that decreases as it faces the insertion rod side.

[0197] Furthermore, the vertical dimension of the lowest and highest parts of the neck 24 is equal to the thickness 24t of the neck 24. Moreover, the thickness 24t of the neck 24 is thinner than the thickness 22t of the fixing part 22, and in this embodiment, it is the thickest part of the engaging part 23, which is also the thickness 23t of the engaging part 23.

[0198] The head 25 includes: a head body 251 extending from the neck 24 toward the insert bar side; a forward protrusion 252 protruding from the head body 251 to a position further forward than the neck 24 and received in the rear recess 18 of the independent chain teeth 11 on the insert bar side; and a rear protrusion 253 protruding from the head body 251 to a position further rear than the neck 24 and engaging with the insert bar 7.

[0199] The upper surface 25a of the head 25 decreases in a stepped manner compared to the highest part of the upper surface of the fixing part 22, and the lower surface 25d of the head 25 increases in a stepped manner compared to the lowest part of the lower surface of the fixing part. In addition, in this embodiment, the thickness 25t of the head 25 is thinner than the thickness 24t of the neck 24 and thinner than the thickness 22t of the fixing part 22.

[0200] The upper surface 25b of the neck side (insertion rod side) of the upper surface 25a of the head 25 is a slope that decreases as it moves toward the insertion rod side.

[0201] In the lower surface 25d of the head 25, the lower surface 25e of the central part in the front-rear direction of the lower surface of the insert rod side is set as an inclined surface that increases in height as it moves toward the insert rod side, and the lower surface 25f of the front part in the front-rear direction of the lower surface of the insert rod side is set as a plane that increases in height in a stepped manner compared to the lower surface 25e (incline) of the central part in the front-rear direction and is orthogonal to the vertical direction.

[0202] The lower surface 25f of the front part in the front-back direction is a part of the lower surface of the front protrusion 252 and the lower surface of the head body 251 (top of the insertion rod side), and the rear end 25k (rear side) of the lower surface 25f is inclined to the rear as it faces the insertion rod side.

[0203] In addition, such as Figure 1 As shown, the gap W between the front end of the head 25 and the front end of the meshing head 61c of the rear end of the continuous chain tooth portion 61 on the seat bar side is wider than the dimension P in the front-back direction of a chain tooth 6a (relative to one turn of the core wire 5a).

[0204] In addition, such as Figure 5 As shown, the forward protrusion 252, the neck 24, and the fixing part 22 form left and right forward recesses 28 covering the front side relative to the neck 24. The forward recesses 28 are formed by recessing into the front surface of the independent chain teeth 21 on the side of the seat bar. The forward recesses 28 are open to the front and top and blocked below by the front shoulder 26.

[0205] Furthermore, the independent chain teeth 11 on the insert side engage with the front protrusion 252 and the front concave portion 28 (see reference). Figure 2 More specifically, the rear protrusion 153 of the independent chain tooth 11 on the insert bar side is received in the front recess 28 of the independent chain tooth 21 on the bar side, and the front protrusion 252 of the independent chain tooth 21 on the bar side is received in the rear recess 18 of the independent chain tooth 11 on the insert bar side. Furthermore, the front protrusion 252 of the independent chain tooth 21 on the bar side faces the shoulder 16 of the independent chain tooth 11 on the insert bar side vertically, and the rear protrusion 153 of the independent chain tooth 11 on the insert bar side faces the front shoulder 26 of the independent chain tooth 21 on the bar side vertically.

[0206] like Figure 5 As shown, the rear protrusion 253 of the independent chain tooth 21 on the seat bar side, the neck 24, and the fixing part 22 form a rear recess 29 covering the rear side relative to the neck 24. The rear recess 29 is formed recessed on the rear surface of the independent chain tooth 21 on the seat bar side. The rear recess 29 is open to the rear and upward and blocked below by the rear shoulder 27. Moreover, the front part of the insert 7 (see reference) engages with the rear recess 29 and the rear protrusion 253 of the independent chain tooth 21 on the seat bar side. Figure 2 ).

[0207] On the front surface of the insert 7 (insert body 71), a recessed front portion 74 is formed to receive the rear protrusion 253 of the independent chain tooth 21 on the seat side. Additionally, the corner 75 of the right surface (seat side surface) and the front surface of the insert 7 is received in the rear recess 29 of the independent chain tooth 21 on the seat side. A corner recess 76 is formed at the corner of the front surface and the right surface (seat side surface) of the corner 75, and this corner recess 76 receives the rear shoulder 27 of the independent chain tooth 21 on the seat side. The corner recess 76 receives the rear shoulder 27 of the independent chain tooth 21 on the seat side in a top-bottom covering manner.

[0208] The front shoulder 26, in the front-to-back direction, protrudes from the fixing part 22, the neck 24, and the head 25 relative to the neck 24. Furthermore, the front shoulder 26 protrudes further back than the front end of the fixing part 22. Additionally, the front shoulder 26 protrudes from the lower parts of the fixing part 22, the neck 24, and the head 25 in the vertical direction. Moreover, the front surface 26c of the front shoulder 26 forms a slope that faces rearward towards the insertion rod side.

[0209] The rear shoulder 27 protrudes from the fixing part 22 and the neck 24 in the posterior-posterior direction relative to the neck 24. Furthermore, the rear end of the rear shoulder 27 is positioned at the same level as the rear end of the fixing part 22. Additionally, the rear shoulder 27 protrudes from the lower part of the neck 24 in the vertical direction. Moreover, the upper surface 27a of the rear shoulder 27 and the upper surface 26a of the front shoulder form a plane at the same height as the lower surface 25f of the front portion of the lower surface 25d of the head 25 in the posterior-posterior direction.

[0210] like Figure 7 , Figure 8 As shown, in the first embodiment of the double-ended zipper 1, when the forward zipper 3 and the reverse zipper 4 are adjacent to each other at the rear ends of a pair of straps 5, the insert 7 can be inserted and removed relative to the forward zipper 3 and the reverse zipper 4.

[0211] In this pluggable state, the individual chain teeth 21 on the bar side are housed inside the forward zipper 3, and the bar 8 is housed inside both the forward zipper 3 and the reverse zipper 4. Furthermore, in this pluggable state, the rear end of the continuous chain teeth 61 on the bar side is located further forward than the rear end of the guide post 35 of the forward zipper 3.

[0212] Furthermore, the double-ended zipper 1 of the first embodiment includes an independent chain tooth portion 20 on the bar side. This independent chain tooth portion 20 is arranged at a predetermined interval in the front-to-back direction relative to the continuous chain tooth portion 61 on the bar side and the bar 8. Therefore, the portion between the independent chain tooth portion 20 and the bar 8, and the portion between the continuous chain tooth portion 61 and the independent chain tooth portion 20, become flexible and deformable due to the front-to-back interval. Moreover, the double-ended zipper 1 of the first embodiment utilizes the sufficient interval formed between the continuous chain tooth portion 61 and the bar 8 on the bar side, as well as the deformable portion, to improve the flexibility of the opposing side edges of the chain strap 2 on the bar side. Therefore, when the insert 7 is inserted into the forward zipper 3 and the reverse zipper 4, the independent chain tooth portion 20 and the continuous chain tooth portion 61 on the bar side will tilt apart relative to a straight line direction of the bar 8, and the tilt of the forward zipper relative to the reverse zipper 4 will be reduced. Furthermore, with the forward pull head 3 and the reverse pull head 4 adjacent to each other at the rear ends of a pair of straps 5, they easily achieve an ideal symmetrical posture, making it easy to insert the insert rod 7.

[0213] Furthermore, in the first embodiment of the double-ended zipper 1, when the insert bar 7 is inserted into the forward zipper 3 and the reverse zipper 4, the rear end of the continuous chain tooth portion 61 on the seat bar side is located further forward than the rear end of the guide post 35. Therefore, compared to, for example, when the rear end of the continuous chain tooth portion 61 on the seat bar side is located at the same or further backward than the rear end of the guide post 35, the continuous chain tooth portion 61 on the seat bar side enters the forward zipper 3 more shallowly. Even if the continuous chain tooth portion 61 on the seat bar side does not deform much, it is easy to achieve an ideal front-to-back symmetrical posture when the forward zipper 3 and the reverse zipper 4 are adjacent to each other at the rear ends of a pair of straps 5. Therefore, the insert bar 7 is easy to insert into a pair of zipper heads.

[0214] Furthermore, in the double-ended zipper 1 of the first embodiment, regarding the independent chain teeth 21 on the bar side, the fixing part 22 extends further forward than the head 25. Therefore, for example, compared with the toothed chain band 2 on the bar side that includes the independent chain teeth 21 on the bar side that make the position of the front end of the fixing part 22 consistent with the front end of the head 25, the dimension between the continuous chain tooth part 61 on the bar side and the independent chain tooth part 20 on the bar side becomes narrower, and the forward pull head 3 or the reverse pull head 4 becomes less likely to fall off.

[0215] Furthermore, in the first embodiment of the double-ended zipper 1, the distance W between the independent chain teeth 21 on the bar side and the continuous chain tooth portion 61 is wider in the head 25 than the dimension P in the front-back direction of one chain tooth 6a of the continuous chain tooth portion 61. Therefore, for example, compared with the toothed chain band on the bar side with the same structure as the distance W and the dimension P, and correspondingly with the amount by which the distance W is wider than the dimension P, the head 25 will not collide with the guide post 35, and the toothed chain band 2 on the bar side is easily deformed.

[0216] Furthermore, in the double-ended zipper of the first embodiment, regarding the independent chain teeth 21 on the side of the base bar, the corner 22h of the right surface (the side opposite to the insert bar) and the rear surface of the fixing part 22 is set as an inclined surface facing forward as it faces the opposite side of the insert bar. The inclined surface makes the distance between the fixing part 22 and the base bar 8 wider as it faces the opposite side of the insert bar. Therefore, when the insert bar 7 is inserted, even if the independent chain teeth 21 are tilted relative to a straight line of the base bar in the forward zipper 3, the corner 22h is not likely to collide with the flange 38a of the forward zipper 3, and the corner 22h is not likely to come into contact with the front surface of the base bar 8, making it easy to insert the insert bar 7.

[0217] Furthermore, the double-ended zipper 1 of the first embodiment includes an independent chain tooth portion 10 on the insert bar side. The independent chain teeth 11 of the independent chain tooth portion 10 on the insert bar side are arranged at intervals in the front-to-back direction relative to the continuous chain tooth portion 61 on the insert bar side and the insert bar 7, respectively. Therefore, the portion between the independent chain tooth portion 10 on the insert bar side and the insert bar 7, and the portion between the continuous chain tooth portion 61 on the insert bar side and the independent chain tooth 11 on the insert bar side, respectively become deformable portions due to the predetermined intervals in the front-to-back direction. Moreover, the double-ended zipper 1 of the first embodiment, by utilizing the sufficient intervals formed between the continuous chain tooth portion 61 on the insert bar side and the insert bar 7 and the deformable portions, improves the flexibility of the opposing side edges of the chain strap 2 on the insert bar side. Therefore, when the insert bar 7 is inserted into the forward zipper 3 and the reverse zipper 4, the independent chain teeth 10 and the continuous chain teeth 61 on the insert bar side will be separated and tilted relative to a straight line direction of the insert bar 7. With the forward zipper 3 and the reverse zipper 4 adjacent to each other at the rear ends of a pair of straps 5, they can easily form an ideal posture of front and back symmetry, thus making it easy to insert the insert bar 7.

[0218] In addition, in the double-ended zipper 1 of the first embodiment, the independent chain teeth 11 of the independent chain tooth portion 10 on the insert bar side can engage and disengage with the toothed chain band 2 on the seat bar side. More specifically, it can engage and disengage with the continuous chain tooth portion 61 on the seat bar side and the independent chain teeth 21 on the seat bar side. Therefore, the connection strength when the pair of toothed chain bands 2 are closed is improved.

[0219] Furthermore, in the double-ended zipper 1 of the first embodiment, the individual chain teeth 21 on the base bar side can engage and disengage with the chain strip 2 on the insert bar side. More specifically, they can engage and disengage with the individual chain teeth 11 on the insert bar side and the insert bar 7, thus increasing the connection strength when the pair of chain strips 2 are closed. In addition, the front part (forward protrusion 252) of the head 21 of the individual chain teeth 21 on the base bar side can engage and disengage with the individual chain teeth 11 on the insert bar side, and the rear part (rear protrusion 253) can engage and disengage with the insert bar 7.

[0220] Furthermore, in the double-ended zipper 1 of the first embodiment, regarding the dimensions corresponding to the thickness direction of the belt 5, the independent chain teeth 11 on the insert bar side make the thickness 13t of the engaging part 13 thinner than the thickness 12t of the fixing part 12, and the independent chain teeth 21 on the seat bar side also make the thickness 23t of the engaging part 23 thinner than the thickness 22t of the fixing part 22. Therefore, when the forward zipper 3 or the reverse zipper 4 is moved back and forth, the upper and lower raised parts 35a and 45a inside the forward zipper 3 and the reverse zipper 4 are less likely to collide with the fixing part 12 and the fixing part 22.

[0221] This invention is not limited to the embodiments described above. For example, the independent chain tooth portion 20 on the seat bar side includes one independent chain tooth 21 in this embodiment, but this invention is not limited to this, and may include multiple independent chain teeth 21. In this case, the multiple independent chain teeth are arranged at intervals in the front-back direction and are fixed to the belt 5. Additionally, the independent chain tooth portion 10 on the insert bar side also includes one independent chain tooth 11 in this embodiment, but this invention is not limited to this, and may include multiple independent chain teeth 11. In this case, the multiple independent chain teeth 11 are also arranged at intervals in the front-back direction and are fixed to the belt 5.

Claims

1. A double-ended zipper (1), comprising: A pair of toothed chain straps (2) extend forward and backward and face each other, and can be opened and closed to the left and right; as well as The forward-facing zipper (3) and the reverse-facing zipper (4) are capable of moving back and forth along the opposing side edges of the pair of toothed chain straps (2). The forward-facing zipper (3) opens the pair of toothed chain straps (2) in a forward direction, and the reverse-facing zipper (4) opens the pair of toothed chain straps (2) in a backward direction. The double-ended zipper (1) is characterized in that... A pair of said tooth chain bands (2) includes: A pair of straps (5) extend forward and backward and face each other to the left and right; A pair of chain teeth (6), comprising multiple chain teeth (6a, 11, 21) arranged in a row, and fixed along opposing side edges of a pair of belts (5), wherein the pair of chain teeth (6) are capable of engaging and disengaging cooperatively; and The insert (7) and the seat (8) are separately fixed to the rear ends of the pair of straps (5). The insert (7) and the seat (8) enable the insert (7) to be inserted and removed relative to the forward pull head (3) and the reverse pull head (4) when the forward pull head (3) and the reverse pull head (4) are adjacent to each other at the rear ends of the pair of straps (5). A pair of said chain teeth (6) includes a plurality of chain teeth (6a) with continuous chain tooth portions (61) in succession. In addition to the continuous chain tooth section (61), the chain tooth row (6) on the seat bar side also includes an independent chain tooth section (20) on the seat bar side that can engage and disengage with the chain tooth band (2) on the insert bar side. The independent chain tooth portion (20) on the seat bar side includes an independent chain tooth (21), which is one or more of the chain teeth (21) fixed to the belt (5) on the seat bar side. The independent chain tooth (21) at the rear end is housed inside the forward zipper (3) while the insert (7) is able to be inserted and removed from both the forward zipper (3) and the reverse zipper (4). The independent chain tooth (20) is positioned between the continuous chain tooth (61) on the seat bar side and the seat bar (8) and is spaced apart from the continuous chain tooth (61) on the seat bar side and the seat bar (8) respectively.

2. The double-ended zipper (1) according to claim 1, characterized in that, In addition to the continuous chain tooth section (61) on the insert bar side, the chain tooth section (6) on the insert bar side also includes an independent chain tooth section (10) on the insert bar side that can engage and disengage with the chain tooth band (2) on the seat bar side. The independent chain tooth portion (10) on the insert bar side includes an independent chain tooth (11), which is one or more of the chain teeth (11) fixed to the strip (5) on the insert bar side. The independent chain tooth (11) at the rear end of the insert bar side is housed inside the forward pull head (3) in a state where the insert bar (7) can be inserted and removed from both the forward pull head (3) and the reverse pull head (4). The independent chain tooth portion (10) on the insert rod side is positioned between the continuous chain tooth portion (61) on the insert rod side and the insert rod (7) and is spaced apart from the continuous chain tooth portion (61) on the insert rod side and the insert rod (7) on the front and back respectively.

3. The double-ended zipper (1) according to claim 2, characterized in that, The independent chain tooth (11) at the rear end of the insert bar side can engage and disengage with the continuous chain tooth portion (61) on the seat bar side and the independent chain tooth (21) on the seat bar side.

4. The double-ended zipper (1) according to any one of claims 1 to 3, characterized in that, The independent chain tooth (21) on the base bar side includes: a fixing part (22) fixed to the band (5) on the base bar side; and an engaging part (23) extending from the fixing part (22) toward the band (5) on the insert bar side and engaging with the chain tooth band (2) on the insert bar side. Regarding the dimension corresponding to the thickness direction of the belt (5), the thickness (23t) of the engaging part (23) is thinner than the thickness (22t) of the fixing part (22).

5. The double-ended zipper (1) according to claim 4, characterized in that, The engaging portion (23) of the independent chain tooth (21) on the seat bar side includes: a neck (24) extending from the fixing portion (22) toward the band (5) on the insert bar side; and a head (25) extending from the neck (24) toward the band (5) on the insert bar side and protruding forward and backward. In the independent chain teeth (21) on the side of the seat bar, the fixing part (22) extends further forward than the head (25).

6. The double-ended zipper (1) according to claim 4, characterized in that, The engaging portion (23) of the independent chain tooth (21) on the seat bar side includes: a neck (24) extending from the fixing portion (22) toward the band (5) on the insert bar side; and a head (25) extending from the neck (24) toward the band (5) on the insert bar side and protruding forward and backward. The head (25) is capable of engaging and disengaging with the tooth chain band (2) on the insert side.

7. The double-ended zipper (1) according to any one of claims 1 to 3, characterized in that, The independent chain teeth (21) on the side of the seat bar are injection molded onto the belt (5). The continuous chain tooth section (61) is a coil-shaped or sawtooth-shaped monofilament that is bent along a three-dimensional direction.

8. The double-ended zipper (1) according to claim 1, characterized in that, The forward pull head (3) includes a guide post (35) that guides a pair of continuous chain teeth (61) in a left-right separated state. When the push bar (7) is inserted or removed from the forward pull head (3) and the reverse pull head (4), the rear end of the continuous chain tooth part (61) on the seat bar side is located further forward than the rear end of the guide post (35).

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