JP2021040937A - Buckle of safety belt for high-place work - Google Patents

Abstract

To provide a buckle that is superior in operability and safety, and is simple in a structure.SOLUTION: A casing 5 of a main body 1 has a tongue insertion opening in a tip 5b, and has a tongue insertion path coming in communication with the tongue insertion opening in an inside thereof. A lock member 14 is arranged in the casing and is extended across the tongue insertion path. The lock member has an engaging projection in a center, and both ends are protruded from a pair of guide slits 12 of both side walls of the casing. The lock member can move between an engaged position where both ends are positioned in one end side of the pair of guide slits and the engaging projection is engaged with an engaging hole 4 of the tongue 2 inserted into the tongue insertion path, and a disengagement position where both ends are positioned in the other end side of the pair of guide slits and the engaging projection is retracted from the tongue insertion path. A spring is arranged in the casing, and always biases both ends of the lock member toward the one end side of the pair of guide slits.SELECTED DRAWING: Figure 1

Description

The present invention relates to a buckle for a safety belt for aerial work.

As a buckle of this kind, for example, there is one described in Patent Document 1.
The buckle described in Patent Document 1 is composed of a main body fixed to one end of the belt and a tongue plate fixed to the other end and inserted and engaged with the main body.

A belt insertion port is formed at the base end of the tongue plate, and a rectangular engagement port is formed at a position within a predetermined length from the tip end.

A belt insertion port is formed at the base end of the main body, and both sides of the tip are bent in a U shape to accommodate the lock member and function as a guide for inserting the tongue plate. At the most advanced portion of the main body, a notch groove is formed in the center in the vertical direction, and both side portions of the notch groove are folded back inward in a V shape.

A pair of operating pieces are projected on both ends of one end of the lock member, a hole for mounting a leaf spring is formed at the other end of the lock member, and a tongue engaging protrusion is provided at the middle portion of the lock member.
Then, the base end of the lock member is housed in the V-shaped folded portion of the main body, a leaf spring is attached between the notch groove of the main body and the hole of the lock member, and the lock member is always rotated upward by the leaf spring. Is elastically urged.

Further, a contact piece support member having a substantially U-shaped cross section is fixed to the base end portion of the main body, and a lock member contact piece is projected near the tip of the contact piece support member. Then, the rotation of the lock member is restricted by the pair of operating pieces of the lock member coming into contact with the contact piece support member.

The tongue engaging protrusion of the lock member is gradually inclined upward from the tip end side of the main body toward the base end side, and an eaves-shaped polymerized piece portion is formed at the end of the main body base end side, which is the top of the tongue engaging protrusion. It is provided.

Further, the abutting material is rotatably attached to the bottom of the abutting material support member around an axis extending in the width direction of the main body, and the abutting material is elastic so as to always rotate in the locking member direction by a spring. Being urged. The abutting material has a protrusion that limits its own rotation, does not come into contact with the lock member when the tongue plate is not inserted, and allows the lock member to rotate freely.

The main body is covered with a resin cover. The cover has a tongue plate insertion slot and a slit for the operating piece of the lock member.

Then, when the tongue plate is inserted from the tongue plate insertion port, it comes into contact with the abutting material and rotates, and when the tip edge of the tongue plate engaging port exceeds the polymerized piece portion of the tongue engaging protrusion, The lock member is rotated upward by the leaf spring to engage the tip edge of the engagement port with the polymerized piece portion, and the abutting material presses the tongue plate to maintain this engaged state.
This ensures that the body and tongue plate engage.

When disengaging the main body and the tongue plate, push the tongue plate beyond the length of the polymer piece against the elasticity of the abutting material to disengage the tip edge of the engagement port and the polymer piece. Then, the tongue plate can be pulled out from the main body by pushing down the operation piece.

However, according to this configuration, when the buckle is disengaged, the operator must push down the operation piece while pushing the tongue plate into the main body and further tightening the belt fastened to the waist, which causes disengagement. There was a problem that it took time and effort.
Further, this buckle has the disadvantages that the structure is complicated, the number of parts is large, and the manufacturing cost is high.

Japanese Patent No. 2991648

Therefore, an object of the present invention is to provide a buckle which is excellent in operability and safety and has a simple structure.

In order to solve the above problems, according to the present invention, a tongue piece attached to one belt to be connected and a tongue piece attached to the other belt to be connected in the safety band for work at height can engage the tongue piece. A first belt insertion port is formed at the base end of the tongue piece, and the tongue piece is engaged at a position spaced from the first belt insertion port to the tip side of the tongue piece. The main body is provided with a casing in which a hole is formed, a second belt insertion port is formed at a base end, and a tongue piece insertion port is opened at the tip, and the inside of the casing is said to be from the tongue piece insertion port. A tongue piece insertion path extending to the base end side is formed, and the main body is further arranged inside the casing, extends across the tongue piece insertion path, and both ends are formed on both side walls of the casing. A plate-shaped lock member protruding from the pair of guide slits is provided, and the lock member is composed of a central portion and a pair of arm portions extending from the central portion to both sides, and the central portion of the tongue piece. Engagement protrusions that can engage with the engagement hole are provided, and each of the pair of arms is inclined so as to gradually move away from the tongue piece insertion path from the central portion, and the corresponding guide slit of the casing. Each of the pair of guide slits has a width corresponding to the width of the arm portion and extends in a direction perpendicular to the tongue piece insertion path, and the lock member is guided by the pair of guide slits. The pair of arms is located on one end side of the pair of guide slits, and the engaging protrusion enters the tongue piece insertion path, and the tongue piece insertion path is entered from the tongue piece insertion port. The engagement position of the tongue piece inserted into the tongue piece to engage with the engagement hole, the pair of arms are located on the other end side of the pair of guide slits, and the engagement protrusion is the difference between the tongue pieces. The main body is further arranged inside the casing and is a guide that regulates the movement of the lock member in the direction across the tongue piece insertion path. And a spring that is arranged inside the casing and elastically biases the pair of arms of the lock member toward the one end side of the pair of guide slits, and the tongue piece difference of the main body. The tongue piece inserted into the inlet is locked in a state of being engaged with the main body, while the lock positions the pair of arms of the lock member at the same time on the other end side of the pair of guide slits. The feature is that it is released only when it is made to A buckle is provided.

According to a preferred embodiment of the present invention, the casing of the main body has a substrate, the second belt insertion port is formed at the base end of the substrate, and extends from the base end of the substrate toward the tip end. The portion is bent on both sides to have a substantially U-shaped cross section, and the pair of guide slits are formed on the side walls of the substantially U-shaped cross section facing each other to form the substantially U-shaped cross section. The inner bottom surface of the portion forms the tongue piece insertion path, and the casing further comprises the opposite side walls of the substantially U-shaped cross section, excluding at least the tongue piece insertion port. It has a cover that covers the gap between them.

According to another preferred embodiment of the present invention, the spring is substantially arched, and the lower ends of both legs of the arch are in contact with the pair of arms of the lock member. It is composed of a leaf spring stacked on a surface opposite to the tongue piece insertion path, and the casing of the main body is provided with a means for constantly pushing the top surface of the leaf spring toward the lock member.

According to still another preferred embodiment of the present invention, a plate-shaped extension portion is provided so as to project from the side edge of the central portion of the lock member closer to the tongue piece insertion port, and the width of the lock member. Extending in the direction, the guide is superposed on the surface of the locking member opposite to the tongue piece insertion path and extends between the opposing side walls of the substantially U-shaped cross section of the substrate. The guide member is formed of a shaped guide member, has a width corresponding to the width of the central portion in a region corresponding to the central portion of the lock member, and is located at a side edge closer to the extension portion of the region. A pair of claws protruding toward the extension portion are provided at positions corresponding to both side edges of the extension portion, both ends of the guide member have a width larger than the width of the guide slit, and the spring has a width larger than the width of the guide slit. A leaf spring is formed on the guide member so that the lower ends of both legs of the arch are substantially arched and the lower ends of both legs of the arch are in contact with both ends of the guide member. A means for constantly pushing the top surface of the spring toward the guide member is provided.

According to the present invention, the main body and the tongue piece that can engage with each other are provided, and the tongue piece is provided with an engaging hole, while the casing of the main body is provided with a tongue piece insertion port at the tip and the tongue piece is inserted inside. Provide a tongue piece insertion route that communicates with the mouth. Then, a lock member extending across the tongue piece insertion path is arranged in the casing, and the lock member is composed of a central portion having an engaging protrusion and a pair of arm portions extending on both sides of the central portion, and a pair of arms. The portion is projected from a pair of guide slits on both side walls of the casing.

Then, the locking member has a pair of arms located on one end side of the pair of guide slits, and an engaging position in which the engaging protrusion engages with the engaging hole of the tongue piece inserted into the tongue piece insertion path. A pair of arms are located on the other end side of the pair of guide slits so that the engaging protrusion can move with the disengaging position retracted from the tongue piece insertion path, and a spring is placed in the casing. Then, the pair of arms is always urged toward one end side of the pair of guide slits.

Here, when the angle of inclination of the pair of arms of the lock member and the height of the engaging protrusions are such that only one of the pair of arms is positioned on the other end side of the guide slit. At the same time that the other arm of the pair of arms abuts on the one end of the guide slit, a certain area of the engagement projection of the locking member still maintains engagement with the engagement hole of the tongue piece. Preset to get.

Then, the tongue piece inserted into the tongue piece insertion port of the main body is locked in a state of being engaged with the main body, while the pair of arms of the lock member are simultaneously positioned on the other end side of the pair of guide slits. Only when the lock is released.
In this case, even if only one arm of the lock member is operated in the direction of releasing the lock, the lock is not released, and a safe and secure engagement state between the tongue piece and the main body is maintained.

In this way, the operator can easily unlock the buckle by holding the main body of the buckle with one hand and operating the pair of arms of the lock member with the thumb and index finger of the handle, and the operability of the buckle is very good. Become. Further, since the lock cannot be released by operating only one arm of the lock member, but only by operating a pair of arms at the same time, sufficient safety is ensured.
Furthermore, the structure of the buckle is simplified and the number of parts is significantly reduced.

It is a perspective view of the buckle of the safety belt for aerial work according to one embodiment of the present invention, (A) shows a state where the tongue piece is separated from the main body, and (B) shows a state where the tongue piece is engaged with the main body. Shown. It is an exploded perspective view of the buckle of FIG. (A) is a perspective view of the lock member and the guide member of the main body of the buckle of FIG. 1, and (B) is a perspective view showing a state in which the lock member and the guide member of (A) are assembled. (A) is a perspective view showing an engaged state between the tongue piece of the buckle of FIG. 1 and the lock member of the main body, and (B) is a cross-sectional view showing a state in which the tongue piece is locked in a state of being engaged with the main body. It is a figure. It is cross-sectional view explaining the movement of the lock member of the body of the buckle of FIG. 1, (A) shows the state which the lock member is in an engagement position, (B) is disengagement even when the lock member is an engagement position. A state in which the lock member is in a position other than the position is shown, and (C) shows a state in which the lock member is in the disengagement position.

Hereinafter, the configuration of the present invention will be described with reference to the accompanying drawings, based on preferred embodiments.
FIG. 1 is a perspective view of a buckle of a safety belt for aerial work according to an embodiment of the present invention, FIG. 1 (A) shows a state in which the tongue piece is separated from the main body, and FIG. 1 (B) shows the tongue piece. It shows the state of being engaged with the main body. Further, FIG. 2 is an exploded perspective view of the buckle of FIG.

3 (A) is a perspective view of the lock member and the guide member of the buckle body of FIG. 1, and FIG. 3 (B) is a perspective view showing a state in which the lock member and the guide member of FIG. 3 (A) are assembled. Is. Further, FIG. 4 (A) is a perspective view showing an engaged state between the tongue piece of the buckle of FIG. 1 and the lock member of the main body, and FIG. 4 (B) is locked with the tongue piece engaged with the main body. It is a cross-sectional view which shows the state.

With reference to FIGS. 1 and 2, the buckle of the aerial work safety belt according to the present invention includes a tongue piece 2 attached to one belt to be connected in the aerial work safety belt and the other belt to be connected. It is attached to a main body 1 that accepts the tongue piece 2 in an engageable manner.

A first belt insertion port 3 is formed at the base end 2a of the tongue piece 2, and an engagement hole 4 is formed at a position spaced from the first belt insertion port 3 to the tip 2b side of the tongue piece 2. ing.
In this embodiment, the tongue piece 2 is formed of a metal plate, and the engagement hole 4 has a rectangular or square shape.

The main body 1 includes a casing 5 in which a second belt insertion port 6 is formed at a base end 5a and a tongue piece insertion port 7 is opened at a tip end 5b. Inside the casing 5, a tongue piece insertion path 8 extending from the tongue piece insertion port 7 to the base end 5a side is formed.

In this embodiment, the casing 5 has a metal substrate 9, and a second belt insertion port 6 is formed at the base end 9a of the substrate 9.
Further, the portion 10 extending from the base end 9a to the tip end 9b of the substrate 9 has a substantially U-shaped cross section with both sides bent. Then, a pair of guide slits 12 and 12 are formed on the side walls 11 and 11 of the substantially U-shaped cross-section portion 10 facing each other, and the inner bottom surface 10a of the substantially U-shaped cross-section portion 10 is inserted into the tongue piece. It forms a path 8.

The casing 5 further has a resin cover 13 that covers the gaps between the side walls 11 and 11 that face each other except for the tongue piece insertion port 7 in the portion 10 having a substantially U-shaped cross section.

The cover 13 has a flat upper wall 13a having a width and a length corresponding to the bottom wall of a portion 10 having a substantially U-shaped cross section of the substrate 9, and first and second first and second covers connected to both end edges of the upper wall 13a. It is composed of side walls 13b and 13c, and has a substantially inverted U-shaped cross section. Further, third side walls 13d and 13d are provided on both side edges of the upper wall 13a, and flanges 13e are provided on the front end edges of the second side wall 13c.

The inner side surface of the upper wall 13a of the cover 13 faces the inner bottom surface 10a of the portion 10 having a substantially U-shaped cross section of the substrate 9, and the first side wall 13b is the portion 10 having a substantially U-shaped cross section. The gap between the side edges of both side walls 11 and 11 closer to the tongue piece insertion port 7 is a constant distance from the inner bottom surface 10a of the portion 10 having a substantially U-shaped cross section (height of the tongue piece insertion port 7). The second side wall 13c covers the gap between the side edges farther from the side walls 11 and 11 of the portion 10 having a substantially U-shaped cross section, and the third side wall 13c covers the gap. The side walls 13d and 13d extend along the outer surfaces of the side walls 11 and 11 of the portion 10 having a substantially U-shaped cross section to the front of the guide slits 12 and 12, and are fitted into the portion 10 having a substantially U-shaped cross section. , The flange 13e is attached to the substrate 9 by the rivets 22 and 22.

Further, the tongue piece insertion port 7 is defined by the lower end edge of the first side wall 13b of the cover 13, the inner bottom surface 10 of the portion having a substantially U-shaped cross section, and the side walls 11 and 11.

The main body 1 is further arranged between the side walls 11 and 11 of the substantially U-shaped cross-section portion 10 of the substrate 9, extends across the tongue piece insertion path 8, and both ends are both side walls 11 and 11 of the substrate 9. A plate-shaped lock member 14 projecting from the pair of guide slits 12, 12 is provided.

With reference to FIG. 3A, the lock member 14 includes a central portion 15 and a pair of arm portions 16 and 16 extending from the central portion 15 on both sides.

The central portion 15 is a pair of an inclined wall 15a that inclines toward the side edge farther from the side edge closer to the tongue piece insertion port 7 so as to gradually approach the insertion path 8, and both sides of the inclined wall 15a. It is formed from a pair of wedge-shaped side walls 15b and 15b connecting the arms 16 and 16.
Then, an engaging projection 17 that can engage with the engaging hole 4 of the tongue piece 2 is formed from the inclined wall 15a and the pair of side walls 15b and 15b.
The width of the engaging protrusion 17 (the length in the length direction of the lock member 14) is set to a size corresponding to the width of the engaging hole 4 of the tongue piece 2.

Each of the pair of arm portions 16 and 16 is inclined so as to gradually move away from the tongue piece insertion path 8 from the central portion 15, and protrudes from the corresponding guide slit 12.
Each of the pair of guide slits 12 and 12 has a width corresponding to the width of the arm portion 16 and extends in a direction perpendicular to the tongue piece insertion path 8.

Further, a plate-shaped extension portion 15c is projected from the side edge of the central portion 15 closer to the tongue piece insertion port 7 and extends along the inclined wall 15a.
Further, a resin protective cap 16a is fitted to each of the tips of the pair of arms 16 and 16.

5A and 5B are cross-sectional views illustrating the movement of the lock member of the buckle body of FIG. 1, FIG. 5A shows a state in which the lock member is in the engaging position, and FIG. 5B shows the lock member. A state in which the lock member is in a position that is neither an engagement position nor an engagement disengagement position is shown, and FIG. 5C shows a state in which the lock member is in the disengagement position.

With reference to FIG. 5, the lock member 14 is guided by a pair of guide slits 12 and 12, and the pair of arm portions 16 and 16 are located on one ends 12a and 12a of the pair of guide slits 12 and 12. Engagement position where the engagement protrusion 17 enters the tongue piece insertion path 8 and engages with the engagement hole 4 of the tongue piece 2 inserted into the tongue piece insertion path 8 from the tongue piece insertion port 7 (FIG. 5). (See (A)), the pair of arms 16 and 16 are located on the other ends 12b and 12b of the pair of guide slits 12 and 12, and the engaging protrusion 17 retracts from the tongue piece insertion path 8. It can move to and from the position (see FIG. 5C).

With reference to FIGS. 2 and 3, the main body 1 is further superposed on the surface of the lock member 14 opposite to the tongue piece insertion path 8 so that the portions 10 of the substantially U-shaped cross section of the substrate 9 are placed on each other. A plate-shaped guide member 18 extending between the side walls 11 and 11 facing each other is provided.

The guide member 18 has a width corresponding to the width of the central portion 15 in the region corresponding to the central portion 15 of the lock member 14, and is provided on both side edges of the extension portion 15c at the side edge closer to the extension portion 15c of the region. A claw 18a protruding toward the extension portion 15c is provided at a corresponding position. Further, similar claws 18a are also provided at positions corresponding to these claws 18a on the side edge far from the extension portion of the region.
Further, both ends 18b, 18b of the guide member 18 have a width larger than the width of the guide slits 12, 12.

In this way, with the guide member 18 superimposed on the lock member 14, the movement of the lock member 14 in the direction across the tongue piece insertion path 8 is restricted.

With reference to FIGS. 2 and 4B, the body is further substantially arched, with the lower ends of both legs 19a, 19a of the arch in contact with both ends 18b, 18b of the guide member 18. It has a leaf spring 19 stacked on the guide member 18.

The top surface 19b of the leaf spring 19 is fixed to the inner surface of the upper wall 13a of the cover 13 of the casing 5 by the rivet 21. Then, with the cover 13 attached to the substrate 9 by the rivet 22, the top surface 19b of the leaf spring 19 is constantly pressed toward the guide member 18 by the cover 13.

In this way, the pair of arm portions 16 and 16 of the lock member 14 are always elastically urged toward the ends 12a and 12a of the pair of guide slits 12 and 12 by the leaf spring 19.

Further, as shown in FIG. 5 (B), the inclination angle of the pair of arm portions 16 and 16 of the lock member 14 and the height of the engaging protrusion 17 are different from each other of the pair of arm portions 16 and 16. When only the portion is positioned on the other end 12b side of the guide slit 12, the other arm portion of the pair of arm portions 16, 16 comes into contact with the one end 12a of the guide slit 12, and at the same time, the lock member 14 A certain area of the engagement projection 17 is preset so that the engagement of the tongue piece 2 with the engagement hole 4 can still be maintained.

In this embodiment, the casing 5 further covers a region excluding the outer surface of the bottom wall of the substantially U-shaped cross-section portion 10 of the substrate 9 and the guide slits 12 and 12 on the outer surfaces of the side walls 11 and 11. It has a resin cover 20.

The cover 20 is composed of a bottom wall 20a having a width and a length corresponding to the bottom wall of a portion 10 having a substantially U-shaped cross section, and a pair of side walls 20b and 20b connected to both side edges of the bottom wall 20a. It has a substantially U-shaped cross section corresponding to the portion 10 of the upper U-shaped cross section.
The thickness of the side wall 20b is set so that the tip of the arm 16 of the lock member 14 at the engaging position slightly protrudes from the side wall 20b.

Further, a notch portion 20c is provided in a portion of the side wall 20b that overlaps with the guide slit 12 of the casing 5, and the notch portion 20c has a width corresponding to the width of the guide slit 12 and is a guide slit 12 downward from the upper end edge of the side wall 20b. It extends to a position slightly beyond 12a at one end.

The cover 20 is fitted into the portion 10 from the outside of the bottom wall of the portion 10 having a substantially U-shaped cross section, and is attached to the substrate 9 by the rivet 23.
When the lock member 14 is in the engaging position, the cover 20 has a portion of the pair of arm portions 16 and 16 protruding from the pair of guide slits 12 and 12 on the back surface side of the substrate 9 or the casing 5 due to an unavoidable force. It has a function of preventing the lock member 14 (main body 1) and the tongue piece 2 from being disengaged from being pushed from the base end 5a side of the lock member 14 (main body 1) against the will of the operator, and is provided as necessary. ..

In this way, when connecting the main body 1 and the tongue piece 2, the tongue piece 2 is inserted into the tongue piece insertion port 7 of the main body 1 by the operator, and the pair of side walls 11, 11 of the substrate 9 and the lock member 14 are connected. It is inserted into the tongue piece insertion path 8 while being guided by the extension portion 15c of the tongue piece.

Then, the tip of the tongue piece 2 advances along the inclined surface 15a while pushing up the engaging projection 17 of the lock member 14 at the engaging position, and the engaging hole 4 of the tongue piece 2 reaches the apex of the inclined surface 15a. Then, the engaging protrusion 17 descends and presses against the tongue piece insertion path 8, and the front end edge of the engaging hole 4 of the tongue piece 2 and the rear end edge of the engaging protrusion 17 (the end on the apex side of the inclined surface 15a). The edge) is engaged, and the lock member 14 returns to the engaged position again. As a result, the tongue piece 2 is locked in a state of being engaged with the lock member 14, and the main body 1 and the tongue piece 2 are firmly connected (with a strength sufficiently satisfying the safety standard regarding the buckle of the safety belt for aerial work). (See FIGS. 4 (A) and 5 (A)).

When disconnecting the main body 1 and the tongue piece 2, the operator holds the main body 1 in one hand, and the thumb and index finger of the handle hold the pair of arms 16 and 16 of the lock member 14 at the same time and the pair of guide slits 12 , 12 may be positioned on the other end 12b, 12b side to release the lock, and while maintaining that state, the tongue piece 2 may be pulled out from the main body 1 with the other hand (see FIG. 5C). ..
In this case, even if only one arm 16 of the lock member 14 is operated in the direction of unlocking, the lock is not released and the tongue piece 2 and the main body 1 are firmly connected (safety belt for work at height). Connection with strength sufficient to meet safety standards for buckles) is maintained (see Figure 5 (B)).

As described above, according to the present invention, the operator holds the buckle body with one hand and operates the pair of arms 16 and 16 of the lock member 14 with the thumb and index finger of the handle, and the body 1 and the tongue piece. The lock of the connection with 2 can be easily released, and the operability of the buckle becomes very good. Further, the lock cannot be released by operating only one arm 16 of the lock member 14, but only by operating the pair of arms 16 and 16 at the same time, so that sufficient safety is ensured. To.
Furthermore, the structure of the buckle is simplified and the number of parts is significantly reduced.

Although the preferred embodiment of the present invention has been described above, the configuration of the present invention is not limited to the above embodiment, and various modifications are proposed by those skilled in the art within the scope of the configuration described in the appended claims. It goes without saying that it can be put out.

1 Main body 2 Tongue piece 2a Base end 2b Tip 3 First belt insertion port 4 Engagement hole 5 Casing 5a Base end 5b Tip 6 Second belt insertion port 7 Tongue piece insertion port 8 Tongue piece insertion path 9 Board 9a Base end 9b Tip 10 Substantially U-shaped cross section 10a Inner bottom surface 11 Side wall 12 Guide slit 12a One end 12b Other end 13 Cover 13a Upper wall 13b First side wall 13c Second side wall 13d Third side wall 13e Flange 14 Lock Member 15 Central 15a Inclined wall 15b Side wall 15c Extension 16 Arm 16a Protective cap 17 Engagement protrusion 18 Guide member 18a Claw 18b End 19 Leaf spring 19a Leg 19b Top surface 20 Another cover 20a Bottom wall 20b Side wall 20c Notch Part 21-23 rivets

Claims (4)

It consists of a tongue piece attached to one belt to be connected in the aerial work safety belt and a main body attached to the other belt to be connected and accepting the tongue piece in an engageable manner.
A first belt insertion port is formed at the base end of the tongue piece, and an engagement hole is formed at a position of the tongue piece at a position spaced from the first belt insertion port to the tip side.
The main body
A second belt insertion port is formed at the base end, and a casing having a tongue piece insertion port opened at the tip is provided, and a tongue piece insertion extending from the tongue piece insertion port to the base end side is provided inside the casing. The route is formed and
The body further
A locking member arranged inside the casing, extending across the tongue piece insertion path, and having both ends protruding from guide slits formed on both side walls of the casing.
The lock member is composed of a central portion and a pair of arm portions extending from the central portion to both sides, and the central portion is provided with an engaging projection capable of engaging with the engaging hole of the tongue piece. Each of the pair of arms is inclined so as to gradually move away from the tongue piece insertion path from the central portion, and protrudes from the corresponding guide slit of the casing.
Each of the pair of guide slits has a width corresponding to the width of the arm portion and extends in a direction perpendicular to the tongue piece insertion path.
The lock member is guided by the pair of guide slits, the pair of arms are located on one end side of the pair of guide slits, and the engaging protrusion enters the tongue piece insertion path, and the tongue The engagement position of the tongue piece inserted into the tongue piece insertion path from the one-side insertion port to engage with the engagement hole and the pair of arms are located on the other end side of the pair of guide slits. At the same time, the engaging protrusion is made movable with and from the disengaging position retracted from the tongue piece insertion path.
The body further
A guide that is arranged inside the casing and regulates the movement of the lock member in a direction across the tongue piece insertion path.
A spring, which is arranged inside the casing and elastically biases the pair of arms of the lock member toward the one end side of the pair of guide slits, is provided.
The tongue piece inserted into the tongue piece insertion port of the main body is locked in a state of being engaged with the main body, while the lock simultaneously holds the pair of arms of the lock member with the pair of guide slits. A buckle characterized in that it is released only when it is positioned on the other end side of the buckle. The casing of the main body has a substrate and
The second belt insertion port is formed at the base end of the substrate, and the portion extending from the base end to the tip of the substrate has a substantially U-shaped cross section with both sides bent, and the substantially U-shaped cross section is formed. The pair of guide slits are formed on the side walls of the portion of the character-shaped cross section facing each other, and the inner bottom surface of the portion of the substantially U-shaped cross section forms the tongue piece insertion path.
The casing further
The first aspect of claim 1, wherein the portion of the substantially U-shaped cross section has at least a cover that covers a gap between the side walls facing each other excluding the tongue piece insertion port. buckle. The spring has a substantially arch shape, and the lower ends of both legs of the arch are arranged to abut the pair of arms of the lock member so as to overlap the surface of the lock member opposite to the tongue piece insertion path. The first or second aspect of the present invention, wherein the casing of the main body is provided with a means for constantly pushing the top surface of the leaf spring toward the lock member. Buckle. A plate-shaped extension portion is projected from the side edge of the central portion of the lock member closer to the tongue piece insertion port and extends in the width direction of the lock member.
The guide is a plate-shaped guide member that is superposed on the surface of the lock member opposite to the tongue piece insertion path and extends between the side walls of the substantially U-shaped cross section of the substrate. Consists of
The guide member has a width corresponding to the width of the central portion in a region corresponding to the central portion of the lock member, and is provided on both side edges of the extension portion at a side edge closer to the extension portion of the region. A pair of claws protruding toward the extension portion are provided at corresponding positions, and both ends of the guide member have a width larger than the width of the guide slit.
The spring has a substantially arch shape, and is composed of a leaf spring stacked on the guide member in such an arrangement that the lower ends of both legs of the arch abut on both ends of the guide member. The buckle according to claim 2, wherein a means for constantly pushing the top surface of the leaf spring toward the guide member is provided.

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