JP2015140554A - Cab of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cab, easy in opening-closing operation of a door, capable of effectively restraining damage, and capable of expanding even a breadth of a hatchway.SOLUTION: The cab comprises a door 13 for opening-closing an opening by traversing and a lock release device 30 for releasing a lock of the door 13 locked in an opening position or a closing position. The lock release device 30 comprises an inner lever 40 and a lock release mechanism 50 for releasing the lock of the door 13 in response to operation of the inner lever 40. The inner lever 40 is rotatably provided around the axis RJ substantially parallel to a wall surface of the door 13, and the lock of the door 13 is released by operation for pulling out a tip part of the inner lever 40 toward the operation space side.

Description

  The present invention relates to a cab installed in a work machine such as a hydraulic excavator, and in particular, in a cab having a door that moves laterally along the side of the cab when opening and closing, such as a slide type or a link type, The present invention relates to an unlocking technique for unlocking from the inside.

  FIG. 1 shows a hydraulic excavator 1 as an example of a conventional work machine. Usually, the hydraulic excavator 1 is composed of a lower traveling body 2 that performs a traveling operation and a machine body 3 that is rotatably installed on the lower traveling body 2. The machine body 3 is provided with an attachment 4 for performing work operations, a machine room 5 containing hydraulic equipment, an engine, and the like, a cab 6 and the like.

  As shown in detail in FIG. 2, the cab 6 is a box-type cab with one passenger, and the driving space 11 is surrounded by a cab body 12 and a door 13. A seat 14 is installed in the center of the rear part of the driving space 11, and operating devices, instruments, and the like are collectively installed around the seat 14.

  A vertically long opening 15 is provided on the front side of the side surface 12 a of the cab main body 12 facing the outside of the machine main body 3 so that the operator can move up and down to the operation space 11.

  The door that opens and closes the opening 15 includes a swing type door, a sliding type door, a link type door, and the like according to function. A link type door is used as the door 13 of the hydraulic excavator 1, and a specific example thereof is disclosed in Patent Document 1, for example.

  The door 13 is moved laterally along the side surface 12 a that continues to the rear of the opening 15 between a closed position that closes the opening 15 and an open position that opens the opening 15 by the link mechanism 13 a. In the case of the link type, since the door 13 is displaced outward by opening, the door 13 is positioned away from the side surface 12a of the cab body 12 in the open position.

  When the door 13 reaches the closed position or the open position, the door 13 is automatically locked and cannot move. A lock release device 16 is installed in the cab 6 so that the lock of the door 13 locked in the closed position or the open position can be released manually.

  That is, in order to unlock the door 13 from the outside of the cab 6 and to open and close the door 13, the outer lever 17 is installed at the central portion of the front end portion 13 b on the outer surface of the door 13. A locking portion 18 that locks the closed door 13 is installed in the vicinity of the outer lever 17.

  As shown in FIG. 3, an inner lever 19 is installed at the central portion of the front end 13 b on the inner surface of the door 13 in order to unlock the door 13 from the inside of the cab 6. Although not shown, a handle for opening and closing the door 13 from the inside is also provided.

  As shown in the figure, the conventional inner lever 19 is made of a rod-like member, and the base end portion is pivotally supported by the door 13 with the tip end portion to be picked facing upward. The inner lever 19 is configured to be able to turn to a certain angle toward the rear centering on an axis extending perpendicular to the wall surface of the door 13, and the door 13 is gripped by turning the rear end and turning backward. Is unlocked.

  As shown in FIG. 3, in the open position, the front end portion of the door 13 projects forward from the rear edge of the opening 15, and the tip end portion of the inner lever 19 faces the operating space 11 through the opening 15. Thereby, the operator can pick up the tip of the inner lever 19 while being seated and rotate it backward, and the door 13 can be unlocked.

  A lock release mechanism 20 that releases the lock of the door 13 in accordance with the operation of the inner lever 19 and the outer lever 17 is integrated into the cab 6 together with the locking mechanism.

  The conventional lock release mechanism 20 is configured by combining a number of members, mainly a parallel link mechanism, and the parallel link mechanism is disposed so as to expand in the front-rear direction along the wall surface of the door 13. A specific example of the conventional unlocking mechanism 20 is disclosed in Patent Document 2, for example.

JP 2003-2104022 A JP-A-9-303024

  In the conventional cab, in order to be able to unlock the door in the open position by the inner lever, it is necessary to secure a rotation space behind the inner lever. Therefore, in order to facilitate the operation of the inner lever, it is preferable to position the inner lever as far as possible from the rear edge of the opening. However, when doing so, the front end of the door approaches the front edge of the opening, and the lateral width W1 of the lift through which the operator passes is narrowed.

  Further, when the door is opened at the closed position, the inner lever may be pulled rearward as it is without using the handle for opening and closing after unlocking with the inner lever.

  In that case, since the direction in which the pulling force acts is substantially the same as the direction of rotation of the inner lever, an excessive load is applied to the proximal end portion of the inner lever and the complex parallel link mechanism connected to the proximal end portion. As a result, these deformations and damages may occur.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cab that is easy to open and close a door, can effectively prevent breakage and the like, and can widen the lateral width of an elevator.

  The present invention relates to a cab installed in a work machine. The cab includes a cab body that surrounds a driving space, an opening provided on a front side of the side surface of the cab body, and a door that opens and closes the opening by laterally moving along the side surface of the cab body. An unlocking device for unlocking the door locked in the open position or the closed position.

  The unlocking device is rotatably provided inside the door, and when the door is in the open position, an inner lever whose front end portion faces the driving space through the opening and according to the operation of the inner lever And an unlocking mechanism for unlocking the door. The inner lever is provided so as to be pivotable about an axis substantially parallel to the wall surface of the door, and the door is unlocked by pulling the tip of the inner lever toward the driving space. It is configured to be.

  Therefore, according to the cab of the present invention, the inner lever is provided so as to be rotatable around an axis substantially parallel to the wall surface of the door, and the tip end portion thereof can be pulled out toward the driving space side. Therefore, the opening / closing operation of the door is facilitated, and the rear space required for operating the inner lever can be reduced when unlocking the door in the open position.

  Therefore, the inner lever can be disposed in the vicinity of the rear edge of the opening without impairing the ease of operation of the inner lever, and the width of the lift opening can be increased.

  And since the operation direction of an inner lever differs from the direction which opens a door, it can prevent effectively misusing an inner lever as a handle. As a result, it is possible to avoid applying an excessive load to the inner lever and the lock release mechanism, and it is possible to effectively prevent such deformation and breakage.

  Specifically, it is preferable to arrange the inner lever so that the shaft does not intersect with the lateral movement direction of the door.

  If it does so, since it becomes difficult to pull an inner lever back, the misuse as a handle of an inner lever can be controlled. Even if the inner lever is misused, the direction in which the pulling force acts does not coincide with the rotation direction of the inner lever, so that deformation or breakage of the inner lever or the like can be reduced.

  In particular, the inner lever may be arranged with the tip portion directed upward or obliquely upward.

  If it does so, it will become easy to pull out an inner lever toward the operation space side with the posture still sitting on the seat, and the misuse of the inner lever can be prevented further.

  More specifically, the lock release mechanism is positioned below the inner lever and rotates about an axis substantially perpendicular to the wall surface of the door. An opening door lock portion that releasably locks the door at a position, and a closing door lock portion that is coupled to the link plate and releasably locks the door at a closed position, and is used for operating the inner lever. Accordingly, it is preferable that the link plate is rotated so that both the opening door locking portion and the closing door locking portion perform the unlocking operation in conjunction with the rotation of the link plate.

  Then, only one link plate rotates according to the operation of the inner lever, and both the open door lock part and the closed door lock part can be unlocked, so the structure of the unlock mechanism is simple and compact. Strength and rigidity can be improved.

  More specifically, the lock release device has an outer lever and a locking portion provided outside the door, and the lock release mechanism rotates in response to an operation of the outer lever. And a third link plate that rotates in response to an operation of the locking portion, and the second link plate and the third link plate are integrally assembled in a state of being superimposed on the link plate. The link plate may be rotated in conjunction with the rotation of the second link plate or the third link plate.

  Then, not only the unlocking by the inner lever, but also the unlocking by the outer lever, and the locking and unlocking by the locking part, the linked and integrated link plates rotate together. Since this is possible, the structure of the unlocking mechanism can be made simpler and more compact, and the strength and rigidity can be further improved.

  Further, the opening door lock portion is rotatably provided on the cab body, and meshes with the hook portion and a hook portion urged by an elastic force toward a lock position where the door is locked. And a reverse hook portion connected to the link plate, the hook portion and the reverse hook portion being connected to each other, and interlocking with the rotation of the link plate. The door may be unlocked by the reverse hook portion pushing back the hook portion against an elastic force.

  By doing so, the structure of the opening door lock portion is also simple and compact, and the number of parts and cost can be reduced, and the assembly work can be improved.

  Thus, according to the cab of the present invention, the door opening / closing operation becomes easier than in the conventional cab. Breakage and the like can be effectively suppressed, and the lateral width of the lift opening can be increased.

It is the schematic which shows an example of the conventional working machine. It is a schematic perspective view which shows an example of the conventional cab. It is the schematic which looked at the side of the conventional cab from the inside. It is the schematic which looked at the side of the cab of this embodiment from the inside. It is the schematic which shows the principal part of the cab of this embodiment. It is a general | schematic disassembled perspective view which shows the principal part of a lock release mechanism. (A)-(c) is a figure for demonstrating a motion of an opening door lock part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use. Note that directions such as up and down and front and rear are shown with reference to the cab as indicated by arrows in the figure.

  FIG. 4 shows a view corresponding to FIG. 3 of the cab 10 to which the present invention is applied. As shown in FIGS. 1 and 2, the basic configuration of the cab 10 is the same as that of the conventional hydraulic excavator 1. Therefore, for the sake of convenience, the same reference numerals are used for components having the same contents, and the description thereof is omitted.

  The cab 10 of this embodiment is different from the conventional cab 6 mainly in the lock release device 30 such as the inner lever 40 and the lock release mechanism 50.

(Inner lever)
As shown in FIG. 4, the inner lever 40 has a pair of leg portions 41, 41 extending in parallel away from each other, and a knob portion 42 erected on the tips of the leg portions 41, 41. A tray-like lever receiver 43 that is elongated and recessed is provided at the central portion of the front end portion 13 b on the inner surface of the door 13. The inner lever 40 is located in front of and above the seat 14.

  The inner lever 40 is assembled in the lever receiver 43, and is disposed in a state inclined to the door 13 so that the knob portion 42 at the tip is directed upward in the forward direction. Specifically, the base end portion of each leg 41 is pivotally supported by the door 13 via the lever receiver 43, and extends substantially parallel to the wall surface of the door 13 perpendicular to the direction in which the inner lever 40 extends. It can be rotated around the axis RJ.

  Thereby, the knob portion 42 can be pulled downward and obliquely rearward toward the driving space 11, and the inner lever 40 has a lock position in a state where the knob portion 42 is accommodated in the lever receiver 43, and The knob 42 is displaced between the unlock position in the state where the knob 42 is pulled out from the lever receiver 43. The inner lever 40 is biased by an elastic force and is configured to automatically return to the lock position.

  Although details will be described later, the door 13 is unlocked by pulling the knob 42 and setting the inner lever 40 to the unlock position.

  In the cab 10, the inner lever 40 is arranged in an inclined state so that the knob portion 42 at the tip is inclined upward toward the front, and the knob portion 42 of the inner lever 40 serves as the driving space 11. Since the door can be pulled out toward the side, the opening and closing operation of the door is facilitated, and the rear space required for operating the inner lever 40 is reduced when unlocking the closed door 13. it can.

  Accordingly, the inner lever 40 can be disposed in the vicinity of the rear edge of the opening 15 without impairing the ease of operation of the inner lever 40, and the lateral width W2 of the lift opening can be increased.

  In particular, the link type door 13 is located away from the side surface 12a of the cab body 12 in the open position. Therefore, it is easy to pull the knob portion 42 toward the operation space 11 side, and there is an advantage that the operability is further improved.

  Further, since the lever axis RJ extends in a direction not orthogonal to the lateral movement direction of the door 13, the operation direction for rotating the inner lever 40 is different from the direction for opening the door 13. Thereby, misuse of the inner lever 40 used as a handle for opening and closing operations can be effectively prevented. As a result, it is possible to avoid deformation and damage due to an excessive load applied to the inner lever 40 and the lock release mechanism 50.

(Unlock mechanism)
Further, in the cab 10, the lock release mechanism is also devised so that the strength and rigidity can be improved while being simple and compact.

  FIG. 5 shows an outline of the lock release mechanism 50. FIG. 5 shows the main part of the unlocking mechanism 50 from the inside of the door 13, and the unlocking mechanism 50 includes a plate complex 51, an opening door locking part 52, a closing door locking part 53, and the like. It is installed in the wall surface of the door 13.

  The closed door lock portion 53 has a function of automatically locking the door 13 that has reached the closed position, and a function of releasing the lock of the door 13 locked at the closed position, and is a door in front of the plate complex 51. 13 at the front end 13b. As shown in FIG. 4, a lock auxiliary portion 54 that locks or unlocks the door 13 in cooperation with the closed door lock portion 53 is provided at the front edge portion of the opening 15 of the cab body 12.

  The opening door lock portion 52 has a function of automatically locking the door 13 that has reached the opening position and a function of releasing the lock of the door 13 locked at the opening position, and is separated rearward from the plate complex 51. (The opening door lock portion 52 will be described later separately).

  The plate complex 51 is a portion that forms the core of the unlocking mechanism 50, and is composed of a plurality of link plates made of a pressed metal plate product.

  Specifically, as shown in FIG. 6, the plate complex 51 includes a first link plate 61, a second link plate 62, a third link plate 63, and a support plate 64, which are superposed on each other. It is assembled and assembled in a state. These link plates 61 to 64 are installed on the door 13 substantially parallel to the wall surface of the door 13.

  The support plate 64 is a non-rotating plate that supports the first to third link plates 61 to 63, and is fixed to the door 13 with a bolt B in a posture substantially parallel to the wall surface of the door 13.

  The support plate 64 has a support fixing hole 64a through which the first shaft pin 65 is inserted so as not to rotate, a support shaft hole 64b through which the second shaft pin 66 is inserted rotatably, and one end of a torsion coil spring 67. A support spring hole 64c to be inserted is formed. One engagement pin 64d is erected on the back surface side of the support plate 64 (the outer surface side of the door 13).

  The third link plate 63 is a plate that rotates in response to the operation of the locking portion 18, and is disposed on the back side of the support plate 64. The third link plate 63 has a third shaft hole 63a through which the first shaft pin 65 is rotatably inserted, a third connection hole 63b connected to the locking part 18 via the third rod 68, and a third link hole 63b. An elongated third engagement hole 63c through which the triaxial pin 69 is movably inserted and a third spring hole 63d into which the other end of the torsion coil spring 67 is inserted are formed.

  The third connection hole 63b is located away from the third shaft hole 63a, and the third engagement hole 63c is disposed between the third shaft hole 63a and the third connection hole 63b. An engaging recess 63e that engages with the engaging pin 64d and restricts the rotation of the third link plate 63 is further formed at the edge of the third link plate 63. The third link plate 63 rotates about the first shaft pin 65 substantially perpendicular to the wall surface of the door 13 against the elastic force of the torsion coil spring 67.

  The second link plate 62 is a plate that rotates according to the operation of the outer lever 17, and is disposed on the surface side of the support plate 64. The second link plate 62 has a second shaft hole 62a through which the second shaft pin 66 is rotatably inserted, and a substantially L-shaped second engagement hole through which the third shaft pin 69 is rotatably inserted. 62b is formed.

  The second link plate 62 is formed with an elongated second connection hole 62c connected to the outer lever 17 via the second rod 70, and a second spring hole 62d to which one end of the pulling coil spring 71 is hooked. ing. The other end of the pulling coil spring 71 is hooked on a hook tool 72 attached to the tip of the first shaft pin 65.

  The second connection hole 62c is disposed away from the second shaft hole 62a, and the second engagement hole 62b is disposed away from the second shaft hole 62a on the opposite side of the second shaft hole 62a. An L-shaped engagement piece 62 e that engages with the edge of the support plate 64 and restricts the rotation of the second link plate 62 is further formed at the edge of the second link plate 62. The second link plate 62 rotates around the second shaft pin 66 that is substantially perpendicular to the wall surface of the door 13 against the elastic force of the pulling coil spring 71.

  The second engagement hole 62b is bent and extends from the first hole 62b1 and the first hole 62b1 extending substantially overlapping with a first engagement hole 61c described later in a no-load state where no external force is applied. A second hole 62b2. The second hole portion 62 b 2 is formed in an arc shape centered on the second shaft hole 62 a and has a length corresponding to the rotation range of the second link plate 62.

  The first link plate 61 is a plate that rotates according to the operation of the inner lever 40, and is disposed on the surface side of the second link plate 62. In the first link plate 61, a first shaft hole 61a through which the second shaft pin 66 is rotatably inserted, an elongated first connection hole 61b connected through the inner lever 40 and the first rod 73, An elongated first engagement hole 61c through which the third shaft pin 69 is movably inserted is formed.

  The first link plate 61 is further connected through a closed first door connecting hole 61d connected through a closed door lock 53 and a front connecting rod 74, through an open door lock 52 and a rear connecting rod 75. The first rear connection hole 61e is formed. The first link plate 61 rotates around the second shaft pin 66.

  By pulling the inner lever 40 toward the operation space 11 side, the first rod 73 is attracted to the inner lever 40 side as shown by arrows in FIGS. Thereby, the first link plate 61 rotates counterclockwise when viewed from the inside of the door 13.

  In conjunction with the rotation of the first link plate 61, the front connection rod 74 and the rear connection rod 75 are attracted to the first link plate 61 side. Thereby, the unlocking operation is performed in both the closed door lock portion 53 and the open door lock portion 52, and the lock of the door 13 is released.

  When the unlocking operation is performed by the outer lever 17, the second rod 70 is attracted to the outer lever 17 side as indicated by an arrow in FIG. Thereby, the second link plate 62 rotates counterclockwise as viewed from the inside of the door 13.

  The first link plate 61 is interlocked with the rotation of the second link plate 62 by the engagement between the first hole 62b1 of the second engagement hole 62b and the first engagement hole 61c by the third shaft pin 69. Rotate. Thereby, the unlocking operation is performed in both the closed door lock portion 53 and the open door lock portion 52, and the lock of the door 13 is released.

  In the unlocked state at the locking portion 18, the third shaft pin 69 is loosely moved inside the third engagement hole 63c, and both the first link plate 61 and the second link plate 62 are both locked and unlocked. It is possible.

  When the locking operation is performed in the locking portion 18, the third link plate 63 rotates, and the third shaft pin 69 is displaced in conjunction with the rotation, and the third shaft pin 69 enters the second hole portion 62b2. By doing so, even if the unlocking operation is performed by the outer lever 17 and the second link plate 62 is rotated, the third shaft pin 69 is not displaced, and the outer lever 17 cannot be unlocked.

  Thus, according to the cab 10 of the present embodiment, the main part of the unlocking mechanism 50 is composed of a plurality of superimposed link plates 61 to 64, and these link plates 61 to 64 are rotated in conjunction with each other. By moving, the door 13 can be unlocked. Thereby, strength and rigidity can be improved while being simple and compact.

  Furthermore, in this cab 10, the opening door lock part 52 is also devised so that the structure is simple and compact.

(Open door lock)
As shown in FIG. 5, the opening door lock portion 52 includes a hook portion 80, a reverse hook portion 81, and the like, and is installed on the door 13.

  The hook part 80 has a curved engaging part 80a at its tip part, and the tip of the engaging part 80a is rounded. The hook portion 80 has a base end portion pivotally supported by the door 13 and is rotatable about an axis extending perpendicular to the wall surface of the door 13. The hook portion 80 is urged by an elastic force clockwise as viewed from the inside of the door 13 toward the position where the engagement portion 80a protrudes forward (lock position), and the engagement portion 80a is recessed. The opposite side is facing the biasing direction.

  The reverse hook portion 81 is disposed to face the front side of the hook portion 80, and has a reverse engagement portion 81a that is curved at a tip portion thereof. The reverse hook portion 81 has a rear end connecting rod 75 connected to a base end portion thereof, and an intermediate portion thereof is pivotally supported by the door 13.

  The reverse hook portion 81 is also rotatable about an axis extending perpendicular to the wall surface, and is installed so that the concave side of the reverse engagement portion 81a meshes with the concave side of the engagement portion 80a. Yes. A columnar contact end portion 81b extending perpendicular to the wall surface of the door 13 is attached to the tip of the reverse engagement portion 81a.

  As shown in FIG. 7A, when the door 13 is closed, the hook portion 80 is in the locked position, and the hook portion 80 is reversely engaged with the engaging portion 80a immediately before the door 13 is opened and reaches the open position. The joining part 81a contacts. Specifically, the lower portion of the engaging portion 80a contacts the upper portion of the contact end portion 81b.

  Furthermore, when the door 13 is opened, the engaging portion 80a rides on the reverse hook portion 81, and the hook portion 80 and the reverse hook portion 81 are connected. As a result, the state shown in FIG. 7B is obtained, and the door 13 is locked at the open position.

  When the inner lever 40 and the outer lever 17 are operated in the open position, the first link plate 61 rotates and the rear connecting rod 75 is pulled, as shown in FIG. The reverse hook portion 81 rotates clockwise as viewed from the inside of the door 13, and the hook portion 80 is pushed back counterclockwise against the elastic force. As a result, the door 13 is unlocked, and the door 13 can be closed.

  As described above, the opening door lock portion 52 is configured by the hook portion 80, the reverse hook portion 81, and the like, so that the structure is simple and compact. As a result, the number of parts, cost, and assembly work can be improved. It has become.

(Other)
In addition, this invention is not limited to embodiment mentioned above, The other various structure is also included. For example, although a hydraulic excavator is used in the description, the present invention is not limited thereto, and the applied work machine may be a crane or the like. In short, it may be a cab having a door that moves laterally along the side when opening and closing, such as a slide type or a link type.

  The inner lever may be arranged with its tip portion facing substantially upward. In addition, when the inner lever is positioned below the seat, it is preferable to dispose the tip portion downward or diagonally downward. The order of stacking the link plates can be changed as appropriate according to the specifications.

DESCRIPTION OF SYMBOLS 10 Cab 11 Operation space 12 Cab main body 12a Side surface 13 Door 15 Opening 30 Unlocking device 40 Inner lever 50 Unlocking mechanism 52 Opening door lock part 53 Closed door lock part 61 1st link plate 62 2nd link plate 63 3rd link plate 64 Support plate RJ Lever shaft

Claims (6)

A cab installed on a work machine,
The cab is
A cab body that surrounds the driving space,
An opening provided on the front side of the side surface of the cab body;
A door that opens and closes the opening by laterally moving along a side surface of the cab body;
An unlocking device for unlocking the door locked in the open position or the closed position;
With
The unlocking device is:
An inner lever that is pivotally provided inside the door, and when the door is in the open position, a tip portion faces the operating space through the opening;
An unlocking mechanism for unlocking the door according to the operation of the inner lever;
Have
The inner lever is provided so as to be pivotable about an axis substantially parallel to the wall surface of the door, and the door is unlocked by an operation of pulling the tip of the inner lever toward the driving space. Cab. The cab according to claim 1, wherein
A cab in which the inner lever is arranged so that the shaft does not intersect with the lateral movement direction of the door. The cab according to claim 2, wherein
A cab in which the inner lever is disposed with its tip end directed upward or obliquely forward. The cab according to claim 2, wherein
The unlock mechanism is
A link plate positioned below the inner lever and pivoting about an axis substantially perpendicular to the wall surface of the door;
An opening door lock portion connected to the link plate and releasably locking the door at the opening position;
A closed door lock connected to the link plate and releasably locking the door in the closed position;
Have
A cab in which the link plate is rotated in accordance with the operation of the inner lever, and both the opening door lock portion and the closing door lock portion are unlocked in conjunction with the rotation of the link plate. The cab according to claim 4, wherein
The unlocking device further includes an outer lever and a locking portion provided outside the door,
The unlocking mechanism further includes:
A second link plate that rotates in response to an operation of the outer lever;
A third link plate that rotates in response to an operation of the locking portion;
Have
The second link plate and the third link plate are integrally assembled in a state of being overlapped with the link plate,
A cab in which the link plate rotates in conjunction with the rotation of the second link plate or the third link plate. The cab according to claim 4 or claim 5,
The opening door lock part is
A hook portion rotatably provided on the cab body and biased by an elastic force toward a lock position where the door is locked;
A reverse hook portion that is rotatably provided on the door so as to mesh with the hook portion, and is connected to the link plate;
Have
The hook part and the reverse hook part are connected, and the door is unlocked by pushing the hook part back against the elastic force in conjunction with the rotation of the link plate. Cab.

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