JP4857364B2 - Belt fixing bracket and lashing tool - Google Patents

Description

  The present invention relates to a belt fixing bracket and a securing tool.

2. Description of the Related Art Conventionally, in a box-shaped transport container mounted on a vehicle such as a truck, rail plates are arranged along the length direction on each of the opposed inner surfaces. The rail plate is provided with a plurality of through holes having the same rectangular shape at intervals in the length direction so that a belt fixing bracket attached to the end of the belt for preventing load collapse can be engaged. It has become.
The belt for preventing load collapse is wound by a buckle equipped with a belt take-up mechanism provided in the middle of the length direction with the belt fixing brackets at both ends engaged with the through holes of the rail plate. To secure the load.

A conventional belt fixing bracket includes a bracket main body made of a metal plate bent in a U-shape when viewed from the side, and a stopper member swingably attached between the U-shaped metal plates of the bracket main body. I have.
The metal fitting body has a thickness dimension slightly smaller than the lateral width dimension of the through hole of the rail plate and a width dimension larger than the vertical width dimension of the through hole by a predetermined dimension difference. Moreover, the metal fitting body includes a groove having a groove width dimension larger than the thickness of the rail plate along the thickness direction at a midpoint in the length direction of both end faces in the width direction.

One groove (hereinafter referred to as a fixed groove) has a depth dimension smaller than the above-mentioned dimensional difference and a groove width slightly larger than the thickness of the rail plate.
The other groove (hereinafter referred to as a variable groove) has a depth dimension larger than the above-described dimensional difference, and has a shape that gradually widens from the groove width dimension slightly larger than the rail plate thickness toward the opening end. Yes. As a result, the bracket body is tilted so that the variable groove side faces the rail plate and inserted into the through hole of the rail plate, and this variable groove is inserted when the tip of the variable groove is inserted into the back side of the rail plate. The rail plate can be easily inserted into the groove.

  The stopper member is provided in the variable groove so as to be able to advance and retreat in the groove width direction. When the stopper member is projected into the variable groove, the depth dimension of the variable groove is smaller than the above-described difference in dimension. It is supposed to be reduced to. The stopper member is biased by a spring in a direction protruding into the variable groove (see, for example, Patent Document 1).

  When the belt fixing bracket is engaged with the through hole, the belt fixing bracket is inserted into the through hole so that the rail plate is inserted to the back of the variable groove with the stopper member retracted from the variable groove. Insert into. Next, the fixed groove side is also inserted into the through hole, the rail plate is inserted into the fixed groove, the stopper member is released, and the depth dimension of the variable groove is reduced. Thereby, unless the stopper member is operated, the belt fixing metal fitting is held so that it cannot be removed from the through hole of the rail plate.

  When tension is applied to the belt and tension is applied to the belt fixing bracket in a direction perpendicular to the rail plate, the entire groove wall of the two grooves arranged on the back side of the rail plate is on the back surface of the rail plate. Since they are struck and receive tension, even if very high tension is applied due to the pressure being dispersed, this can be stably supported.

Japanese Patent No. 3574339

  However, in many cases where a load is secured by a belt, in order to generate a force in a direction in which the load is pressed by the belt surface, it is necessary to apply tension while the belt is curved by the load. In this case, in at least one of the belt fixing brackets provided at both ends of the belt, the belt is inclined with respect to the longitudinal direction of the bracket body, and the bracket body has a direction in which the bracket body is tilted with respect to the rail plate. A large load is applied to the.

  In the case of a conventional belt fixing bracket, the fixing groove provided in the bracket main body has a groove width dimension slightly larger than the thickness of the rail plate, and the movable groove has a groove width dimension sufficiently larger than that. Therefore, if a force acts in the direction of tilting the bracket body, the groove wall of the fixed groove will be on the front and back surfaces of the rail plate with the fixed bracket tilted against the rail plate by the gap between the fixed groove and the rail plate. The force can be received by touching.

  However, the contact between the groove wall of the fixed groove and the rail plate when the tension is applied in the direction in which the fixing bracket is tilted with respect to the rail plate is one line contact at each of the front and back surfaces of the rail plate. Therefore, there is an inconvenience that the pressure acting on the contact portion becomes excessive. In particular, when the rail plate is made of a light metal such as aluminum in order to reduce the weight, there is a disadvantage that sufficient strength cannot be obtained, and an indentation is formed on the rail surface or the rail plate is curved. is there.

  The present invention has been made in view of the above-described circumstances, and even when the tension of the belt acts in a direction inclined with respect to the metal fitting body, the pressure acting on the contact portion with the rail plate is reduced, An object of the present invention is to provide a belt fixing metal fitting and a securing tool capable of preventing damage to a rail plate and a metal fitting body.

In order to achieve the above object, the present invention provides the following means.
The present invention includes a metal fitting body made of a metal plate that is attached to an end portion of a belt and is bent in a substantially U shape in a side view, and the metal fitting body is provided with rails on both end surfaces in the width direction of the metal fitting body. Each of the grooves in the width direction is provided with a groove for inserting the rail plate in a state of being inserted into a rectangular through hole provided through the plate in the plate thickness direction. While allowing the rail body to fall with respect to the surface of the rail plate in a state where the rail plate is disposed in the diagonal position with the rail plate sandwiched between both grooves when the metal plate is tilted to the maximum A belt fixing bracket having a groove shape in which side walls disposed on the rail plate contact the front and back surfaces of the rail plate substantially simultaneously.

  According to the present invention, the metal fitting body is inserted into the through hole of the rail plate, and the rail plate is inserted into the grooves provided on both end surfaces in the width direction, with respect to the length direction of the metal fitting body. When the belt tension acts in the tilting direction, the metal fitting body tilts with respect to the rail plate. Since the fixed and movable grooves of the metal fitting body have a groove shape in which the edges of the side walls of these grooves come into contact with the surface of the rail plate almost simultaneously when they fall down to the maximum, the belt tension is It is received by being distributed in two grooves. As a result, the pressure at the contact portion between the fixture and the rail plate can be reduced to almost half, and damage to the rail plate and the fixture can be prevented in advance.

  In the above invention, a width dimension of the metal fitting body is larger than a width dimension of the through hole by a predetermined dimension difference, one of the grooves has a depth dimension larger than the dimension difference, and the other of the grooves is The depth may be smaller than the dimensional difference, and the other groove may have substantially the same shape as the shape of the one groove up to the middle position in the depth direction.

  In this way, when inserting the fixing bracket into the through hole, the rail plate is inserted into the deeper groove and then the rail plate is inserted into the shallower groove so that the rail can be easily inserted into both grooves. The plate can be placed in the inserted state. When the belt tension is applied in a direction inclined with respect to the longitudinal direction of the fixing bracket, the fixing bracket is inclined with respect to the rail plate, and the ends of the two grooves formed on both end faces of the fixing bracket. The edge can be more reliably brought into contact with the surface of the rail plate at the same time, and the pressure at the contact portion between the fixing bracket and the rail plate can be halved to prevent damage to the rail plate and the fixing bracket.

Further, in the above invention, the width dimension of the metal fitting body is larger than the width dimension of the through hole by a predetermined dimension difference, and one of the grooves has a depth dimension larger than the dimension difference, The other has a depth dimension smaller than the dimensional difference, and the other groove has a dimension slightly larger than the thickness of the rail plate at the groove bottom to a dimension larger than the groove width of the one groove at the opening end. It may have a groove shape that gradually widens.
By doing so, the groove wall of the groove bottom portion having a groove width slightly larger than the plate thickness of the rail plate abuts against the rail plate in the plate thickness direction, and the metal fitting body is thicker than the rail plate. It is possible to prevent rattling in the direction.

  Further, in the above invention, the width dimension of the metal fitting body is larger than the width dimension of the through hole by a predetermined dimension difference, and one of the grooves has a depth dimension larger than the dimension difference, The other has a depth dimension smaller than the dimensional difference, and the other groove is slightly larger than the thickness of the rail plate at the groove bottom, and slightly smaller than the groove width of the one groove at the opening end. It may have a shape in which the edge in the plate thickness direction is gradually chamfered and the edge in the plate thickness direction is chamfered.

  By doing so, the groove wall of the groove bottom portion having a groove width slightly larger than the plate thickness of the rail plate abuts against the rail plate in the plate thickness direction, and the metal fitting body is thicker than the rail plate. It is possible to prevent rattling in the direction. In addition, the chamfered portion at the edge allows the rail body and the bracket body to come into surface contact when the bracket body is inclined with respect to the rail plate, further reducing the pressure at the contact portion between the fixed bracket and the rail plate. Thus, damage to the rail plate and the fixing bracket can be prevented.

The present invention also provides a lashing tool including any one of the belt fixing brackets described above and a belt having the belt fixing bracket attached to an end thereof.
According to the present invention, the belt fixing bracket and the rail plate can be prevented from being damaged even when the belt is stretched in a direction inclined with respect to the direction orthogonal to the rail plate and a large tension is applied to the belt. You can secure your luggage.

Also, one reference example of the present invention is provided with a rectangular parallelepiped block-shaped metal fitting body attached to the end of the belt, and the metal fitting body penetrates in the thickness direction of the rail plate at both ends in the width direction of the metal fitting body. In the state where the rail plate is inserted into the rectangular through-hole provided, a groove for arranging the rail plate in the inserted state is provided, and these two grooves are provided in the state where the rail plate is disposed in the groove. While allowing the metal fitting body to fall with respect to the surface of the rail plate, the edges in the plate thickness direction of the side walls of these grooves contact the surface of the rail plate almost simultaneously when the metal plate falls down to the maximum. A belt fixing bracket having a groove shape is provided.
According to this reference example , when the rectangular parallelepiped block-shaped metal fitting body is tilted to the maximum with respect to the rail plate, the edges of the side walls of the fixed groove and the movable groove contact the surface of the rail plate almost simultaneously. The contact portion between the fixing bracket and the rail plate is dispersed. Thereby, the pressure concerning the fixture of a rail board is reduced and damage to a rail board or a fixture can be prevented beforehand.

  According to the present invention, even when the belt tension acts in a direction inclined with respect to the metal fitting body, the pressure acting on the contact portion with the rail plate is reduced to prevent the rail plate or the metal fitting body from being damaged. There is an effect that can be.

It is a perspective view which shows the securing tool which concerns on the 1st Embodiment of this invention. It is the (a) side view and (b) front view which show the belt fixing metal fitting which concerns on this embodiment with which the securing tool of FIG. 1 is equipped. FIG. 3 is a front view illustrating a process of engaging the belt fixing metal fitting of FIG. 2 with a through hole of a rail plate, (a) an initial stage of insertion, (b) during insertion, and (c) a longitudinal section of the rail plate when insertion is completed. . When a force is applied to the belt fixing bracket of FIG. 2 in a direction perpendicular to the surface of the rail plate, (b) a reaction received from the rail plate when a force is applied in a direction inclined with respect to the surface of the rail plate. It is a schematic diagram which shows force. It is a front view which shows the 1st modification of the belt fixing metal fitting of FIG. It is a front view which shows the 2nd modification of the belt fixing metal fitting of FIG. It is a perspective view which shows the belt fixing metal fitting which concerns on the 2nd Embodiment of this invention. It is a front view of the belt fixing metal fitting of FIG. It is a top view of the belt fixing metal fitting of FIG. It is a left side view of the belt fixing metal fitting of FIG. It is a right side view of the belt fixing metal fitting of FIG. When a force is applied to the belt fixing bracket in FIG. 7 in a direction perpendicular to the surface of the rail plate, (b) a reaction received from the rail plate when a force is applied in a direction inclined with respect to the surface of the rail plate. It is a schematic diagram which shows force.

[First Embodiment]
A belt fixing bracket 1 and a securing tool 2 according to a first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the tying tool 2 according to the present embodiment includes a belt 3, a belt fixing bracket 1 attached to at least one end of the belt 3, and a buckle that winds the belt 3 and applies tension (illustrated). Abbreviation).

  The belt fixing bracket 1 according to the present embodiment is a rectangular shape in which a plurality of rail plates 4 arranged along the length direction on each of the opposing inner side surfaces of a transport container or the like are provided at intervals in the length direction. Are inserted into the through-holes 5 and fixed. As shown in FIGS. 2 (a) and 2 (b), the belt fixing metal fitting 1 includes a metal fitting body 6 having a shape in which a metal plate is bent in a substantially U shape when viewed from the side, and the metal fitting body. A stopper member 7 is provided in a gap between the metal plates constituting the metal plate 6 so as to be swingable about an axis A extending in the thickness direction of the metal plate.

  In addition, the metal fitting body 6 is provided with a long hole 8 extending along the width direction in the vicinity of the end opposite to the curved portion 6a of the metal plate. The long hole 8 has a length dimension and a width dimension into which the belt 3 can be inserted. The belt 3 can fix the belt fixing bracket 1 to the end portion by stitching the end portion that has passed through the long hole 8 to a midway position in the length direction of the belt 3 itself.

  The metal fitting body 6 has a thickness dimension slightly smaller than the horizontal width dimension X of the rectangular through hole 5 provided in the rail plate 4 and a vertical width dimension Y of the through hole 5 as shown in FIG. A groove 9 having a width dimension larger by a predetermined dimension difference Δ and having a groove width dimension larger than the plate thickness of the rail plate 4 along the thickness direction at a midpoint in the length direction of both end faces in the width direction, 10 is provided.

One groove (hereinafter referred to as a fixed groove) 9 has a depth dimension smaller than the dimension difference Δ between the width dimension of the metal fitting body 6 and the vertical width dimension of the through hole 5. The other groove (hereinafter referred to as a variable groove) 10 has a depth dimension larger than the above-described dimension difference Δ.
A stopper member 7 is disposed in the variable groove 10 so as to be able to advance and retract in the groove width direction. When the stopper member 7 is projected into the variable groove 10, the depth dimension of the variable groove 10 is reduced to a depth dimension smaller than the dimensional difference Δ. The stopper member 7 is urged in a direction protruding into the variable groove 10 by a spring (not shown).

  The variable groove 10 has a shape that gradually widens from the groove width dimension slightly larger than the thickness of the rail plate 4 toward the opening end. As a result, as shown in FIG. 3A, in a state where the stopper member 7 is retracted from the variable groove 10, the bracket body 6 is inclined so that the variable groove 10 side faces the rail plate 4, and the rail plate 4 is inserted into the through hole 5, and the rail plate 4 is easily inserted into the variable groove 10 when the curved portion 6 a side of the tip of the variable groove 10 is inserted into the back side of the rail plate 4. Can be done.

  Further, since the variable groove 10 has a depth dimension that is larger than the dimension difference Δ between the width dimension of the metal fitting body 6 and the vertical width dimension of the through hole 5, the rail plate 4 is inserted to the back of the variable groove 10. Thus, as shown in FIG. 3B, the end portion of the metal fitting body 6 on the fixed groove 9 side can also be inserted into the through hole 5. Then, with the rail plate 4 inserted into both the fixed groove 9 and the variable groove 10, as shown in FIG. 3C, the stopper member 7 is released and the variable groove 10 is recovered by the elastic restoring force of the spring. By projecting inward, the depth dimension of the variable groove 10 becomes smaller than the dimensional difference Δ. Thereby, the belt fixing metal fitting 1 is held so as not to be detached from the through hole 5 of the rail plate 4.

In this embodiment, the groove shape of the fixed groove 9 is a substantially symmetric shape obtained by horizontally reversing the shape of the groove shape of the variable groove 10 indicated by the broken line in FIG. Have.
That is, the groove shape of the variable groove 10 formed in a state in which the stopper member 7 is protruded into the variable groove 10 is a groove whose depth is smaller than the above dimensional difference Δ and sufficiently larger than the thickness of the rail plate 4. It has a width dimension and a shape in which one groove wall 9a is inclined in a direction that widens toward the opening end.

The operation of the securing device 2 and the belt fixing bracket 1 according to the present embodiment configured as described above will be described below.
In order to fix the belt 3 to the rail plate 4 using the belt fixing bracket 1 according to this embodiment, the stopper member 7 is retracted outside the variable groove 10 as shown in FIG. The metal fitting body 6 is inclined and inserted into the through hole 5 of the rail plate 4 so that the variable groove 10 having a depth dimension larger than the dimensional difference Δ is directed to the rail plate 4. By inserting the rail plate 4 to the back of the variable groove 10, as shown in FIG. 3B, the end of the metal fitting body 6 on the fixed groove 9 side can also be inserted into the through hole 5. Therefore, as shown in FIG. 3 (c), the entire belt fixing bracket 1 is inserted into the through hole 5, and the rail plate 4 is also inserted into the fixing groove 9.

  By releasing the stopper member 7 in this state, the stopper member 7 protrudes into the variable groove 10 by the spring, and the depth dimension of the variable groove 10 is reduced. Thereby, the belt fixing metal fitting 1 can be engaged with the through hole 5 so as not to be removed.

  When the force F along the direction orthogonal to the rail plate 4 is applied to the belt fixing bracket 1 engaged with the through hole 5 in this way, as shown in FIG. The groove walls 9b and 10b arranged on the front end side of the metal fitting body 6 of the groove 9 and the variable groove 10 are pressed against the back surface of the rail plate 4 and receive this force F by the reaction force f. Since the metal fitting body 6 is composed of a metal plate curved in a U shape, the groove walls 9b and 10b and the back surface of the rail plate 4 are in surface contact at two places on both the fixed groove 9 side and the variable groove 10 side. Be made. Thereby, the pressure concerning the rail board 4 is fully reduced.

  Next, when a force F acts on the belt fixing bracket 1 engaged with the through hole 5 in a direction inclined with respect to the direction orthogonal to the rail plate 4, as shown in FIG. A moment acts on the metal fitting body 6 and the metal fitting body 6 falls in the direction of the force F with respect to the rail plate 4. Here, in the present embodiment, since the fixed groove 9 and the variable groove 10 have a substantially symmetrical shape and a groove width dimension sufficiently larger than the plate thickness of the rail plate 4, the metal fitting body 6 is a conventional one. Will fall more than anything else.

  The metal fitting body 6 can be tilted until the edge of the groove wall of the fixed groove 9 and the variable groove 10 contacts the surface of the rail plate 4. At this time, on the back surface side of the rail plate 4, the opposite ends of the fixing groove 9 and the variable groove 10 in the thickness direction of the belt fixing bracket 1 are in contact with the back surface of the rail plate 4. Therefore, the moment acting on the metal fitting body 6 is supported by the reaction force f generated at the two contact portions apart from the front and back surfaces of the rail plate 4.

  In this case, according to the belt fixing bracket 1 according to the present embodiment, the fixing groove 9 and the variable groove 10 have a substantially symmetrical groove shape. The edges of both groove walls of the variable groove 10 are in contact with the surface of the rail plate 4 substantially simultaneously. As a result, the moment acting on the metal fitting body 6 is supported at two places on both ends of the metal fitting body 6 in the width direction, so that each contact is compared with the case where it is conventionally supported at one place on the fixed groove 9 side. The pressure applied to the part can be halved.

  As a result, according to the lashing device 2 provided with such a belt fixing bracket 1 at the end of the belt 3, even if the belt 3 is stretched in a direction inclined with respect to the orthogonal direction of the rail plate 4, the belt 3 can be applied, and at that time, the rail plate 4 can be prevented from being damaged. In particular, even when an aluminum alloy or the like is used as the rail plate 4, it is possible to prevent indentation from remaining on the surface or deformation of the rail plate 4 and to reduce the weight. Moreover, it is not necessary to apply an excessive force to the metal fitting body 6, and damage to the metal fitting body 6 can be prevented.

  In the present embodiment, the fixing groove 9 is also formed in accordance with the wide groove shape of the variable groove 10 which must be formed wide considering the ease of insertion of the rail plate 4 into the through hole 5. Therefore, in a state where the rail plate 4 is inserted into both the grooves 9 and 10, the gap between the grooves 9 and 10 and the rail plate 4 is large, and rattling occurs. There is no performance problem with this rattling itself, but there may be a sense of incongruity in use. Therefore, the shape of the fixing groove 9 for preventing the rattling will be described below.

  That is, as shown in FIG. 5, compared with the shape of the variable groove 10 indicated by the chain line, the groove width dimension slightly larger than the thickness of the rail plate 4 at the groove bottom position, A groove shape having an inclined side wall 9a that gradually expands substantially linearly to a groove width dimension larger than the groove width dimension at the opening end may be employed. By doing in this way, the gap between the groove 9 and the rail plate 4 can be reduced in a state where the rail plate 4 is disposed in the vicinity of the groove bottom, thereby preventing rattling.

  By adopting such a configuration, when the belt fixing bracket 1 falls down with respect to the rail plate 4, any position of the edge of the inclined side wall 9 a of the fixing groove 9 is placed on the surface of the rail plate 4. The edge of the side wall of the variable groove 10 can be configured to contact the surface of the rail plate 4 substantially simultaneously with the contact. Thereby, when the metal fitting body 6 falls down with respect to the rail plate 4 in the same manner as described above, the pressure applied to each contact portion can be halved, and damage to the rail plate 4 and the metal fitting body 6 can be prevented. Can do.

  Further, as shown in FIG. 6, compared to the shape of the variable groove 10 indicated by the chain line, the groove width dimension slightly larger than the thickness of the rail plate 4 at the groove bottom position, the variable groove 10 at the opening end position is A groove shape that has a side wall 9a that is inclined so as to gradually extend substantially linearly to a groove width dimension smaller than the groove width dimension of the opening end and whose edge in the thickness direction is chamfered may be employed. Also by doing in this way, it is possible to prevent rattling by reducing the gap between the groove 9 and the rail plate 4 in a state where the rail plate 4 is disposed in the vicinity of the groove bottom. Moreover, since the chamfered side wall 9a comes into surface contact with the surface of the rail plate 4 when the metal fitting body 6 falls with respect to the rail plate 4, the pressure applied to each contact portion can be further reduced. Damage to the plate 4 and the metal fitting body 6 can be prevented.

Next, a belt fixture 21 according to a reference example of the present invention will be described with reference to the drawings. In the description of this reference example , description of points that are common to the belt fixing bracket 1 according to the first embodiment will be omitted, and different points will be mainly described.
The belt fixing bracket 21 according to the present reference example is different from the belt fixing bracket 1 according to the first embodiment in that the metal plate 6 is bent in a substantially U shape when viewed from the side and the metal fitting body 6 is formed. Instead, for example, the rectangular parallelepiped block-shaped metal fitting body 6 is integrally formed by lost wax casting.

  As shown in FIGS. 7 and 8, the metal fitting body 6 is a hollow housing in which the stopper member 7 can be accommodated so as to be swingable around the axis A, and the stopper member 7 is located at the position of the variable groove 10. An opening for projecting a part of 7 is provided. On the other hand, the side wall on the fixing groove 9 side and the side wall on the front end 6b side of the metal fitting body 6 are continuously closed in the plate thickness direction.

As shown in FIG. 7, flat single closed surfaces 23 and 26 are formed on the side walls of the fixed groove 9 and the variable groove 10 on the curved portion 6a side, respectively.
As shown in FIGS. 7, 10, and 11, curved surfaces 24, 27, 31, and 33 are formed on all the edges of the side walls of the fixed groove 9 and the variable groove 10 by rounding the corners. ing.

The operation of the belt fixing bracket 21 of the present reference example having the above configuration will be described below.
When a force F along the direction perpendicular to the rail plate 4 is applied to the belt fixing bracket 21 engaged with the through hole 5 as shown in FIG. The closing surfaces 23 and 26 of the fixed groove 9 and the variable groove 10 that continue in the vertical direction are pressed against the back surface of the rail plate 4, and this force F is received by the reaction force f. That is, on both the fixed groove 9 side and the variable groove 10 side, the closing surfaces 23 and 26 and the back surface of the rail plate 4 are brought into surface contact with a wider contact area than the belt fixing bracket 1 according to the first embodiment. Thereby, the pressure concerning the rail board 4 can be reduced more.

  Next, when a force F acts on the belt fixing bracket 21 engaged with the through hole 5 in a direction inclined with respect to the direction orthogonal to the rail plate 4, as shown in FIG. A moment acts on the metal fitting body 6 and the metal fitting body 6 falls in the direction of the force F with respect to the rail plate 4. At this time, on the back surface side of the rail plate 4, the curved surface on the opposite side in the thickness direction of the metal fitting body 6 of the fixed groove 9 and the variable groove 10 contacts the back surface of the rail plate 4. Therefore, the moment acting on the metal fitting body 6 is supported by the reaction force f generated at the two contact portions apart from the front and back surfaces of the rail plate 4.

In this case, according to the belt fixing bracket 21 according to the present reference example , the front and back surfaces of the rail plate 4 and the curved surfaces 24, 27, 31, and 33 of the bracket main body 6 come into contact with each other. Compared with the belt fixing metal fitting 1 according to the first embodiment in which the corners of the edge and the rail plate 4 are brought into contact with each other, the contact area with the rail plate 4 is enlarged and the pressure applied to the rail plate 4 is further reduced. Can do.

As described above, according to the belt fixing bracket 21 according to the present reference example , the force F along the direction orthogonal to the rail plate 4 acts on the belt fixing bracket 21 engaged with the through hole 5. In any case where the force F acts in a direction inclined with respect to the direction orthogonal to the rail plate 4, the pressure applied to the rail plate 4 and the metal fitting body 6 can be further reduced. Damage to the metal fitting body 6 can be prevented.

In the present reference example , the metal fitting body 6 has been described as being integrally formed by, for example, lost wax casting. Instead of this, the metal plate is substantially U-shaped in a side view as in the first embodiment. The metal plate may be bent in half, and the two metal plates constituting the side walls of the fixed groove 9 and the variable groove 10 may be integrated by welding or the like.

1, 21 Belt fixing bracket 2 Fastening tool 3 Belt 4 Rail plate 5 Through hole 6 Metal fitting body 9 Fixing groove (groove)
9a, 10a Side wall 10 Variable groove (groove)
Δ Dimensional difference

Claims (5)

A metal fitting body made of a metal plate that is attached to the end of the belt and is bent in a U-shape when viewed from the side,
On both end faces in the width direction of the metal fitting body, there are grooves for placing the rail plate in the inserted state in a state where the metal fitting body is inserted into a rectangular through hole provided through the rail plate in the plate thickness direction. Each provided,
These two grooves in the width direction allow the metal fitting body to fall with respect to the surface of the rail plate in a state in which the rail plate is disposed in these grooves, and when both are tilted to the maximum, A belt fixing bracket having a groove shape in which a side wall disposed at a diagonal position across the rail plate contacts the front surface and the back surface of the rail plate substantially simultaneously in the groove. The width dimension of the metal fitting body is larger than the width dimension of the through hole by a predetermined dimensional difference,
One of the grooves has a depth dimension greater than the dimensional difference, and the other of the grooves has a depth dimension less than the dimensional difference;
The belt fixing bracket according to claim 1, wherein the other groove has substantially the same shape as a shape of the one groove up to an intermediate position in the depth direction. The width dimension of the metal fitting body is larger than the width dimension of the through hole by a predetermined dimensional difference,
One of the grooves has a depth dimension greater than the dimensional difference, and the other of the grooves has a depth dimension less than the dimensional difference;
2. The belt fixing bracket according to claim 1, wherein the other groove has a groove shape gradually expanding from a dimension slightly larger than a thickness of the rail plate at a groove bottom to a dimension larger than a groove width of the one groove at an opening end. . The width dimension of the metal fitting body is larger than the width dimension of the through hole by a predetermined dimensional difference,
One of the grooves has a depth dimension greater than the dimensional difference, and the other of the grooves has a depth dimension less than the dimensional difference;
The other groove gradually widens from a dimension slightly larger than the thickness of the rail plate at the groove bottom to a dimension slightly smaller than the groove width of the one groove at the opening end, and the edge in the thickness direction is chamfered. The belt fixing metal fitting according to claim 1, which has a shaped shape.   A securing tool comprising the belt fixing bracket according to any one of claims 1 to 4 and a belt having the belt fixing bracket attached to an end portion thereof.

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