JP2009243153A - Gate fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gate fixing device capable of fixing an opening of a gate in a blocked state by engaging a packing box with the gate without performing alignment work to a latching part of an engaging part located in a push-out position advanced with respect the packing box. <P>SOLUTION: A pivoting implement 22 supports a connecting implement 20 with an engaging part 27 located on the locking implement 23 side rather than the pivoting implement 22 so that a portion, located on the locking implement 23 side from a nut part 21, of a shank 26 of the connecting implement 20 is turnable and that the connecting implement 20 is movable forward and backward between the push-out position advanced to the locking implement 23 side and a retreat position retreated to the pivoting implement 22 side. The locking implement 23 has a latching part for regulating the movement of the connecting implement 20 in a retreat direction, and a turning motion regulating guide part for regulating the turning motion of the engaging part 27 of the connecting implement 20 and guiding the engaging part 27 to the latching part at the same time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gate fixing device capable of fixing an opening in a closed state by engaging a packing box having an opening with a gate connected to the packing box so that the opening can be opened and closed. .

  An example of a conventional gate fixing device is shown in FIG. 9 (see, for example, Patent Document 1). The gate fixing device 1 has a hook member 2 provided at the rear end of the cargo box 7, an engaging portion 3 that can be engaged with the hook member 2 at one end, and a male screw at the other end side. A first member 4 having a support member 5 that supports the first member 4 so as to be swingable between an engageable position and a retracted position; The second member 6 is configured.

According to this gate fixing device 1, the hook member 2 and the first member 4 that is swingably supported by the support member 5 are provided, so that the engaging portion 3 of the first member 4 is connected to the hook member 2. The engaging portion 3 can be positioned at an engageable position for engaging with each other. The engaging portion 3 of the first member 4 can be engaged and fixed to the hook member 2 by rotating the second member 6 in a predetermined direction.
JP-A-9-150663

  However, in the conventional gate fixing device 1 shown in FIG. 9, in order to engage the cargo box 7 and the gate 8, an alignment operation is performed so that the engaging portion 3 of the first member 4 is positioned at the engageable position. However, the rotation operation of the second member 6 has to be performed, and the work is complicated and complicated. Further, if the alignment is insufficient, the first member 4 may be incompletely engaged with the hook member 2.

  The present invention has been made in order to solve the above-described problems, and without performing an alignment operation on the engaging portion of the engaging portion positioned at the pushing position advanced with respect to the load box. An object of the present invention is to provide a gate fixing device capable of engaging a box and a gate and fixing an opening of the gate in a closed state.

  In order to solve the above problems, a gate fixing device according to the present invention engages a packing box having an opening and a gate connected to the packing box so that the opening can be opened and closed. In a gate fixing device capable of being fixed in a closed state, a coupling tool having a shaft portion having a male screw portion and an engaging portion connected to one end portion of the shaft portion is provided and screwed into the male screw portion. A rotation operation part having a female screw part is provided, a shaft support is provided on the gate, a locking tool is provided on the cargo box, and the shaft support is positioned on the locking tool side of the engagement part of the connecting tool. The position on the locking tool side can be rotated from the rotation operation part of the shaft part of the coupling tool, and the push-out position in which the coupling tool is advanced with respect to the locking tool side and the retracted position in which the coupling tool is moved back to the shaft support side. And a latch that restricts movement in the direction in which the coupler retreats, and an engaging portion of the coupler. It is characterized in that it has a rotation regulating guide portion for guiding the engaging portion simultaneously with restricting the rotation to the hook portion.

  According to the gate fixing device according to the present invention, the opening of the packing box can be fixed in the closed state by engaging the packing box and the gate without performing the positioning operation of the engaging portion with respect to the locking tool. it can. That is, since the positioning of the engaging portion with respect to the locking tool is performed by rotating the rotating operation portion, the packing box and the gate can be engaged with each other in a simple procedure. Can be prevented from being performed. Furthermore, inadequate alignment can prevent incomplete engagement between the coupling tool and the locking tool.

  In the gate fixing device according to the present invention, the engaging portion includes a first projecting portion and a second projecting portion that project in opposition to each other in the radial direction of the shaft portion, and the locking tool is a latching portion and a rotation restriction. A first locking plate and a second locking plate facing each other, each having a guide portion, and forming an insertion space for the engaging portion between the locking plates, and the width dimension of the insertion space of the engaging portion Preferably, the first and second protrusions are formed narrower than the longitudinal dimension in which they are formed.

  If it does in this way, a connection tool and a locking tool can be engaged with two places, a 1st protrusion part and a 1st latching part, and a 2nd protrusion part and a 2nd latching part, The gate can be more reliably engaged. Moreover, the 1st protrusion part and the 2nd protrusion part can be engaged with a 1st latching part and a 2nd latching part, respectively by rotating a connection tool in an extrusion position.

  Further, in the gate fixing device according to the present invention, the first and second locking plates are each substantially U-shaped consisting of an upper side portion, a middle side portion, and a lower side portion that are notched from the end opposite to the shaft support. A cutout portion is formed, and the middle side portion of each cutout portion of the first and second locking plates is used as a latching portion, and the upper side portion and the second side of the cutout portion of the first locking plate. By making the lower side part of the notch part of a locking plate into a rotation control part, manufacture of a locking tool becomes easy and it contributes to reduction of manufacturing cost.

  In the gate fixing device according to the present invention, the insertion space is provided with an escape prevention plate having an insertion hole into which the engagement portion can be inserted and removed, and the insertion hole is substantially similar to the shape of the engagement portion viewed from the insertion space side. It is preferable to form it.

  If it does in this way, unless the rotation position of an engaging part is matched with a predetermined | prescribed rotation position, it can be made impossible to insert / remove an engaging part with respect to an insertion hole. As a result, when the engagement between the engagement portion and the latching portion is unexpectedly released, the engagement portion abuts against the escape prevention plate, and the engagement between the cargo box and the gate can be prevented from being released.

  According to the present invention, the opening of the gate can be obtained by engaging the packing box and the gate without performing the alignment operation with respect to the latching portion of the engaging portion located at the pushing position advanced with respect to the packing box. It is possible to provide a gate fixing device that can fix the device in a closed state.

  Hereinafter, an embodiment of a gate fixing device according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the gate fixing device 10 is applied to a fixing device for a packing box 12 and a gate 13 of a container 11. The container 11 is rotatably connected by a hinge 14 and an upper portion of an opening edge forming the opening 15 so that the opening 15 can be opened and closed so that the opening 15 can be opened and closed. And a gate fixing device 10 that engages a lower portion of the opening edge forming the opening 15 and a lower edge of the gate.

  FIG. 2 is an enlarged view of a main part showing the gate fixing device 10 provided in the container.

  As shown in FIG. 2, the gate fixing device 10 includes a connector 20, a nut portion 21 (rotating operation portion), a shaft support 22 provided at the lower edge portion of the gate 13, and an opening of the cargo box 12. And a locking tool 23 provided at the lower part of the opening edge part forming the part 15.

  The connector 20 is formed in a substantially T-shape as a whole, each of which is formed of a linear body and is provided orthogonal to each other, and a shaft portion 26 having a male screw portion 25, and a base end portion of the shaft portion 26 And an engaging portion 27 that is provided continuously. The engaging portion 27 includes a first projecting portion 28 and a second projecting portion 29 that project to face each other in the radial direction of the shaft portion 26. Then, as can be seen from FIGS. 3 and 5, the shaft portion 26 advances the engagement portion 27 toward the locking tool 23, and the engagement portion 27 is moved to a first latching portion 49 and a second engagement portion described later. The push-out position positioned on the opposite side of the shaft support 22 from the latching portion 50 and the engaging portion 27 are retracted toward the shaft support 22 so that the engaging portion 27 is engaged with a guide groove 42 described later. The length is such that it can be moved back and forth between the retracted positions.

  The nut portion 21 is screwed with the male screw portion 25 of the shaft portion 26.

  FIG. 3 is a perspective view of the shaft support 22. As shown in this figure, the shaft support 22 has an outer shape like a substantially U-shape in which the left part and the right part of a horizontally placed plate body are bent 90 degrees in the same direction. A left side portion 37 is connected to one end of the portion 36, and a right side portion 38 is connected to the other end of the middle side portion 36 in a state of being bent 90 degrees in the same direction with respect to the middle side portion 36. An opening 39 is formed between the other end of the left side portion 37 and the other end of the right side portion 38 where the middle side portion 36 is not connected. The shaft support 22 is attached to the lower edge of the gate 13 with the opening 39 positioned on the locking tool 23 side (see FIG. 2). A shaft support hole 40 having a diameter substantially the same as the diameter of the shaft portion 26 is formed in the middle side portion 36, and the engagement portion 27 is positioned on the locking tool 23 side in the shaft support hole 40. The connector 20 is inserted (see FIG. 2). The nut portion 21 is screwed into the male screw portion 25 on the tip portion 30 side of the shaft portion 26 with respect to the shaft support hole 40. Therefore, the shaft support hole 40 can freely move back and forth between the push-out position where the shaft portion 26 is rotatable and the connecting tool 20 is advanced toward the locking tool 23 and the retracted position where the connection tool 20 is retracted toward the shaft support 22. I support it. A guide plate 41 is provided between the left side portion 37 and the right side portion 38 in the horizontal direction, and the guide plate 41 is provided above the upper end of the shaft support hole 40. The guide plate 41 is formed with a guide groove 42 cut out in a substantially U shape from the end on the opening 39 side, and the guide groove 42 includes the first protrusion 28 and the second protrusion. The first protrusion 28 and the second protrusion 29 of the connector 20 are formed in a shape that allows the first protrusion 28 and the second protrusion 29 to be engaged with each other (see FIG. 2).

  FIG. 4 is a perspective view of the locking tool 23. As shown in this figure, the locking device 23 is hung on the first locking plate 44 and the second locking plate 45 which are vertically long and parallel (opposed) with each other, and on one end of the locking plates 44 and 45. An escape prevention plate 46 is provided. And the locking tool 23 is attached to the lower part of the opening edge part of the opening part 15 of the packing box 12 with the escape prevention plate 46 located in the shaft support tool 22 side (refer FIG. 2).

  An insertion space 53 for the engaging portion 27 is formed between the first locking plate 44 and the second locking plate 45. The width D of the insertion space 53 is narrower than the dimension d in the longitudinal direction in which the first protrusion 28 and the second protrusion 29 of the engaging portion 27 are formed (see FIG. 6B). ), By rotating the connecting tool 20 in the pushing position, the first protrusion 28 and the second protrusion 29 are respectively connected to a first latching portion 49 and a second locking plate 45 of the first locking plate 44 described later. The second latching portion 50 can be engaged.

  The first locking plate 44 and the second locking plate 45 are each a substantially U-shaped first portion formed of an upper side portion, a middle side portion, and a lower side portion that are notched from the end opposite to the shaft support 22. A notch portion 47 and a second notch portion 48 are formed, and the middle sides of the first notch portion 47 and the second notch portion 48 are respectively a first catch portion 49 and a second catch portion. While forming the stop part 50, the upper side part of the 1st notch part 47 and the lower side part of the 2nd notch part 48 are the 1st rotation control guide part 51 and the 2nd rotation control guide part 52, respectively. Forming.

  Each of the first rotation restriction guide part 51 and the second rotation restriction guide part 52 causes the first protrusion 28 to contact the first rotation restriction guide part 51 by turning the connector 20 at the pushing position. At the same time as the contact, the second projecting portion 29 is formed at a position where it can be brought into contact with the second rotation restricting guide portion 52. In addition, the second rotation restriction guide part 52 is formed below the first rotation restriction guide part 51, and the first rotation restriction guide part 51 and the second rotation restriction guide part 52 are formed. The width dimension L in the height direction of the space formed between and the diameters of the first protrusion 28 and the second protrusion 29 of the engaging portion 27 are formed substantially the same, and the connector 20 is extruded. By rotating approximately 90 degrees in a predetermined direction at a position, the first protrusion 28 is brought into contact with the first rotation restriction guide 51 and the second protrusion 29 is brought into contact with the second rotation restriction guide 52. It can be touched.

  And the lower side part of the 1st notch part 47 and the upper side part of the 2nd notch part 48 are each formed in the outer side of the rotation locus of the engaging part 27 located in the extrusion position, The lower side portion of the first cutout portion 47 and the upper side portion of the second cutout portion 48 do not hinder the rotation of the engaging portion 27 positioned at the pushing position.

  And the upper part of the 1st notch part 47 of the 1st latching plate 44 forms the 2nd inversion control part 56, and the lower part of the 2nd notch part 48 of the 2nd latching board 45 is 1st inversion. A restricting portion 55 is formed so that the rotation of the connector 20 can be restricted.

  The escape prevention plate 46 is formed with a long hole-like insertion hole 54 in the vertical direction, and the shape of the insertion hole 54 is substantially similar to the shape of the engaging portion 27 when viewed from the insertion space 53 side. In addition to being formed in a shape, the size of the insertion hole 54 is slightly larger than the size of the engaging portion 27, and the engaging portion 27 is adjusted by aligning the engaging portion 27 with a predetermined rotation position. Can be inserted into and removed from the insertion hole 54.

  Next, the operation of the gate fixing device 10 configured as described above will be described with reference to FIGS. 2 and 5 to 7. Now, as shown in FIG. 2, the engaging portion 27 of the connector 20 is located at the retracted position retracted toward the shaft support 22, and the first projecting portion 28 is engaged with the guide groove 42. Suppose that

  When engaging the packing box 12 and the gate 13, as shown in FIG. 5, the nut portion 21 is turned in a predetermined turning direction (for example, counterclockwise), and the nut portion 21 is moved to the shaft portion 26. Move toward the tip 30. And while maintaining the rotation position of the connection tool 20, while the connection tool 20 is advanced with respect to the locking tool 23, the engaging part 27 is inserted into the insertion hole 54, and the first latching part 49 and the second latching part are inserted. It moves to the extrusion position located on the opposite side of the shaft support 22 from the latching portion 50.

  Further, since the nut portion 21 is not sufficiently moved in the direction of the distal end portion 30 of the shaft portion 26, the nut portion 21 remains in the middle side of the shaft support 22 even when the connecting tool 20 is advanced relative to the locking tool 23. When the connecting tool 20 cannot be moved to the pushing position by contacting the part 36, the engaging part 27 is further advanced toward the locking tool 23 in a state where the engaging part 27 is inserted through the insertion hole 54. When the nut portion 21 is turned in the turning direction (for example, counterclockwise), the coupling tool 20 is turned in the same turning direction as the nut portion 21 in conjunction with the nut portion 21, and the first protruding portion. 28 and the 2nd protrusion part 29 contact | abut to the 1st inversion control part 55 of the 2nd locking plate 45, and the 2nd inversion control part 56 of the 1st locking plate 44, respectively (refer FIG. 4). As a result, the rotation of the connector 20 can be restricted, so that by rotating the nut portion 21, the nut portion 21 is moved in the direction of the distal end portion 30 of the shaft portion 26 and the engaging portion 27 is pushed out. Can be moved to a position.

  Then, as shown in FIG. 6A, the nut portion 21 is rotated in a rotation direction (for example, clockwise direction) in which the connector 20 is moved backward toward the shaft support 22 side. As a result, the coupler 20 rotates in the same rotation direction as the nut portion 21 in conjunction with the nut portion 21. Then, as shown in FIG. 6 (b), the first protrusion 28 and the second protrusion 29 of the engaging portion 27 are respectively connected to the first locking plate 44 by rotating the connector 20 approximately 90 degrees. The first rotation restriction guide part 51 and the second rotation restriction guide part 52 of the second locking plate 45 abut. Thereby, the rotation of the connector 20 can be restricted.

  Then, as shown in FIG. 7, when the nut portion 21 is further rotated in a rotation direction (for example, clockwise direction) in which the connector 20 is moved backward toward the shaft support 22, the first protruding portion 28 of the engaging portion 27. The second protrusion 29 slides on the first rotation restriction guide 51 and the second rotation restriction guide 52, respectively, and is guided to the first hook 49 and the second hook 50, respectively. . And the 1st protrusion part 28 and the 2nd protrusion part 29 engage with the 1st latching part 49 and the 2nd latching part 50, respectively. In this way, the locking tool 23 provided on the packing box 12 and the shaft support tool 22 provided on the gate 13 can be engaged with each other by the connecting tool 20, and the packing box 12 and the gate 13 can be engaged with each other. By engaging, the opening 15 can be fixed in the closed state.

  Next, a procedure for releasing the engagement between the locking member 23 and the shaft support 22 will be described with reference to FIGS.

  Now, as shown in FIG. 7, it is assumed that the locking tool 23 and the shaft support 22 are engaged by the connecting tool 20. First, the nut portion 21 is rotated in a rotation direction (for example, counterclockwise) in which the connector 20 is advanced to the locking device 23 side. As a result, the coupler 20 rotates in the same rotation direction as the nut portion 21 in conjunction with the nut portion 21. As a result, the engagement between the first protrusion 28 and the first hook 49 and the second protrusion 29 and the second hook 50 is released. Then, as shown in FIG. 2, the engaging portion 27 is inserted into the insertion hole 54 and retracted to the retracted position located on the shaft support 22 side, and either the first protruding portion 28 or the second protruding portion 29 is inserted. One of them is engaged with the guide groove 42. Then, as shown in FIG. 2, the nut portion 21 is rotated in a predetermined rotation direction (for example, clockwise direction) and moved to a position where it abuts on the middle side portion 36 of the shaft support 22. In this way, the engagement between the locking tool 23 and the shaft support 22 can be released.

  As described above, according to the gate fixing device 10, the engaging portion 27 that rotates in conjunction with the nut portion 21 by the turning operation of the nut portion 21 that moves the connector 20 located in the push-out position in the retracting direction. At the same time as restricting the rotation, the first rotation restricting guide part 51 for guiding the first protrusion part 28 and the second protrusion part 29 of the engagement part 27 to the first hook part 49 and the second hook part 50, respectively. Since the second rotation restricting guide part 52 is formed, the positions of the first protrusion part 28 and the second protrusion part 29 of the engagement part 27 with respect to the first hook part 49 and the second hook part 50 are set. Without carrying out the alignment operation, the packing box 12 and the gate 13 can be engaged to fix the opening 15 of the packing box 12 in the closed state.

  That is, the alignment of the first projecting portion 28 and the second projecting portion 29 of the engaging portion 27 with respect to the first retaining portion 49 and the second retaining portion 50 causes the engaging portion 27 to retreat toward the shaft support 22 side. Since it is performed by rotating the nut portion 21 in the rotating direction (for example, clockwise), the packing box 12 and the gate 13 can be engaged with each other in a simple procedure, and an erroneous operation is performed. Can be prevented. Moreover, it can prevent that the connection tool 20 and the latching tool 23 engage incompletely by inadequate alignment.

  In addition, the connecting tool 20 includes a first protruding portion 28 and a second protruding portion 29, and the locking tool 23 includes a first hooking portion 49 and a second hooking portion 50. The locking tool 23 can be engaged with the first projecting portion 28, the first latching portion 49, the second projecting portion 29, and the second latching portion 50 at two locations. Engagement can be ensured.

  Further, a first cutout portion 47 and a second cutout portion 48 are formed in the first locking plate 44 and the second locking plate 45, respectively, and the first hooking portion 49 and the second notching portion are respectively formed in these cutout portions. Since the latching part 50, the 1st rotation regulation guide part 51, and the 2nd rotation regulation guide part 52 were formed, manufacture of the latching tool 23 becomes easy and it contributes to reduction of manufacturing cost.

  Further, when viewed from the insertion space 53 side, the shape of the insertion hole 54 is substantially similar to the shape of the engagement portion 27, and the size of the insertion hole 54 is larger than the size of the engagement portion 27. Since it is formed somewhat larger, the engaging portion 27 can be inserted into and removed from the insertion hole 54 by adjusting the engaging portion 27 to a predetermined rotational position. Therefore, when the engagement between the first projecting portion 28 and the first latching portion 49 and the second projecting portion 29 and the second latching portion 50 of the engaging portion 27 is unexpectedly released, the engaging portion 27 is prevented from escaping. It is possible to prevent the engagement between the packing box 12 and the gate 13 from coming into contact with the plate 46.

  And since the guide plate 41 having the guide groove 42 is provided on the shaft support 22, when the nut portion 21 is moved in the direction of the distal end portion 30 of the shaft portion 26 in a state where the connector 20 is located at the retracted position, The first projecting portion 28 or the second projecting portion 29 is locked in the guide groove 42, and the connecting tool 20 does not rotate in conjunction with the rotation operation of the nut portion 21. Therefore, the nut part 21 can be moved in the direction of the tip part 30 of the shaft part 26 only by rotating the nut part 21 without supporting the connector 20. Further, since the guide plate 41 positions the rotation position of the connection tool 20 so that the longitudinal direction of the connection tool 20 is positioned in the vertical direction, the connection tool 20 is locked to the locking tool 23 while maintaining this rotation position. The engaging portion 27 can be inserted into the insertion hole 54 formed in the shape of a long hole in the vertical direction.

  However, in the above-described embodiment, as shown in FIG. 2, the connecting tool 20 is provided with two projecting parts, the first projecting part 28 and the second projecting part 29, and the same number of rotations are provided in the locking tool 23. Although it was set as the structure which provided the regulation guide part and the latching part, it is good also as a composition which provided any one protrusion part, the rotation regulation guide part, and the latching part in the connector 20, instead of this, Or it is good also as a structure which provided the 3 or more protrusion part, the rotation control guidance part, and the latching | locking part.

  And in the said embodiment, the substantially U-shaped 1st notch part 47 and the 2nd notch part 48 were formed in the 1st locking plate 44 and the 2nd locking plate 45 of the locking tool 23, respectively. Although it was configured, it is not limited to this. For example, as shown in FIG. 8, it is good also as the locking tool 60 which formed the substantially square 1st locking hole 63 and the 2nd locking hole 64 in the 1st locking plate 61 and the 2nd locking plate 62, respectively. .

  The gate fixing device according to the present invention engages the gate with the gate without performing the alignment operation with respect to the latching portion of the engaging portion located at the pushing position advanced with respect to the cargo box. It is suitable for fixing the opening of the container in a closed state, and can be widely used for fixing the gate of the container.

It is a front view concerning one embodiment of a container provided with a gate fixing device concerning this invention. It is a principal part enlarged view of a container provided with the gate fixing device which concerns on the same embodiment. It is a perspective view which shows the shaft support which concerns on the same embodiment. It is a perspective view which shows the latching tool which concerns on the same embodiment. It is an enlarged view for demonstrating the usage method of a container provided with the gate fixing device which concerns on the embodiment, and is the front view which located the connector in the extrusion position. It is an enlarged view for demonstrating the usage method of a container provided with the gate fixing device which concerns on the embodiment, (a) is the front view which rotated the connector in the extrusion position, (b) is a connector in the extrusion position. It is a perspective view of a connecting tool and a locking tool in a state in which is rotated. It is an enlarged view for demonstrating the usage method of a container provided with the gate fixing device which concerns on the embodiment, and is a front view of the state which engaged the connection tool and the latching tool. It is a perspective view which shows other embodiment of the latching tool which concerns on the same invention. It is a front view of a container provided with the gate fixing device of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gate fixing device 11 Container 12 Cargo box 13 Gate 20 Connecting tool 21 Nut part 22 Shaft support 23 Locking tool 25 Male thread part 26 Shaft part 27 Engagement part 49 1st latching part 50 2nd latching part 51 1st Rotation restriction guide part 52 Second rotation restriction guide part

Claims (4)

  In a gate fixing device capable of engaging a packing box having an opening and a gate connected to the packing box so that the opening can be opened and closed, and fixing the opening in a closed state. A connecting portion having a shaft portion having a male screw portion and an engaging portion connected to one end portion of the shaft portion, and a turning operation portion having a female screw portion screwed into the male screw portion; A shaft support is provided on the gate, a locking tool is provided on the cargo box, and the shaft support is configured such that an engaging portion of the connection tool is positioned closer to the lock tool than the shaft support. A push-out position in which the part on the side of the locking tool is rotatable from the turning operation part of the shaft part of the shaft and the connecting tool is advanced to the side of the locking tool; The locking tool is the same as the latching part that restricts the movement of the connecting tool in the retreating direction and the rotation of the engaging part of the connecting tool. Gate locking device, characterized in that it comprises a rotation regulating guide portion for guiding the 該掛 stop portion engaging portion.   The engaging portion includes a first projecting portion and a second projecting portion that project to face each other in the radial direction of the shaft portion, and the locking tool includes the latching portion and the rotation restricting guide portion. A first locking plate and a second locking plate which are opposed to each other, and an insertion space for the engaging portion is formed between the locking plates, and a width dimension of the insertion space is set to the first size of the engaging portion. 2. The gate fixing device according to claim 1, wherein the gate fixing device is narrower than a dimension in a longitudinal direction in which the first and second projecting portions are formed.   Forming a substantially U-shaped cutout portion composed of an upper side portion, a middle side portion, and a lower side portion cut out from the end opposite to the shaft support on each of the first and second locking plates; The middle side portion of each notch portion of the first and second locking plates is used as the latching portion, and the upper side portion of the notch portion of the first locking plate and the second locking plate are cut. The gate fixing device according to claim 2, wherein a lower side portion of the notch portion is used as the rotation restricting portion.   An escape prevention plate having an insertion hole into which the engagement portion can be inserted and removed is provided in the insertion space, and the insertion hole is formed in a shape substantially similar to the shape of the engagement portion viewed from the insertion space side. The gate fixing device according to claim 2 or 3.

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