JP2021161821A - Head guard device - Google Patents

Abstract

To suppress hindrance of a member for holding a guard in an open state when the guard is in the opened and work concerning a roof part is performed.SOLUTION: A guard side component 60 performs a lock operation (L) when a guard 30 is rotated in a direction from a close state (30A) toward an open state 30B. The lock operation (L) is operation for rotating a guard side component 60 with respect to the guard 30 so that at least one of a cabin side lock part 55a and a guard side lock part 65a is caught by the other lock part. When the guard (30) is in the open state 30B, the cabin side lock part 55a and the guard side lock part 65a are arranged outside Yo in a lateral direction of a guard rotation shaft A30.SELECTED DRAWING: Figure 2

Description

The present invention relates to a head guard device provided on a roof portion of a cabin of a work machine.

For example, Patent Document 1 and the like describe a conventional head guard device. In the technique described in the same document, the guard (front guard in the same document) can be opened and closed with respect to the roof portion (see FIGS. 1 and 2 in the same document).

Japanese Unexamined Patent Publication No. 2008-285886

In the technique described in the same document, a stay (replacement rod) is used to hold the guard in an open state (open state). Then, when the guard is opened and work related to the roof portion (for example, cleaning) is performed, the stay may interfere with the work.

Therefore, it is an object of the present invention to provide a head guard device capable of suppressing the member for holding the guard in the open state from becoming an obstacle when the work related to the roof portion is performed with the guard in the open state. do.

The head guard device is provided on the roof portion of the cabin of the work machine. The head guard device includes a guard, a cabin-side component, and a guard-side component. The guard is rotatably attached to the cabin so that it can be in a closed state covering the roof portion and in an open state in which the roof portion is released. The cabin-side component is attached to the cabin and has a cabin-side lock portion. The guard-side component is rotatably attached to the guard and has a guard-side lock. The rotation axis of the guard with respect to the cabin is defined as the guard rotation axis. When the guard is in the closed state, the side from the guard rotation axis toward the tip of the guard on the side far from the guard rotation axis is the lateral inner side, and the side opposite to the lateral inner side is the lateral outer side. do. The guard-side component is configured to perform a locking operation when the guard rotates in a direction from the closed state to the open state. The lock operation is an operation in which the guard-side component rotates with respect to the guard so that at least one of the cabin-side lock portion and the guard-side lock portion hangs on the other. The cabin-side lock portion and the guard-side lock portion are configured to hold the open state of the guard by engaging at least one of the cabin-side lock portion and the guard-side lock portion on the other. When the guard is in the open state, the cabin-side lock portion and the guard-side lock portion are arranged laterally outward from the guard rotation axis.

With the above configuration, it is possible to prevent the member for holding the guard in the open state from becoming an obstacle when the work related to the roof portion is performed with the guard in the open state.

It is a figure which shows the head guard device 20 and the like of 1st Embodiment, and is the perspective view which shows the head guard device 20 and the like when the guard 30 is a closed state 30A. FIG. 3 is a perspective view showing a head guard device 20 and the like when the guard 30 shown in FIG. 1 is in the open state 30B. It is a perspective view which shows the holding mechanism 40 and the like when the guard 30 shown in FIG. 1 is a closed state 30A. FIG. 5 is a perspective view showing a holding mechanism 40 and the like when the guard 30 shown in FIG. 1 is in the open state 30B. FIG. 3 is a view of the holding mechanism 40 and the like when the guard 30 shown in FIG. 3 is in the closed state 30A as viewed from the direction of F5. FIG. 5 is a view corresponding to FIG. 5 when the guard 30 shown in FIG. 5 is in a state between the closed state 30A and the open state 30B. FIG. 4 is a view of the holding mechanism 40 and the like when the guard 30 shown in FIG. 4 is in the open state 30B as viewed from the direction of F7. FIG. 5 is a view corresponding to FIG. 5 showing the head guard device 220 of the second embodiment. FIG. 8 is a view corresponding to FIG. 8 showing a state in which the lock by the holding mechanism 40 shown in FIG. 8 is released.

(First Embodiment)
The head guard device 20 and the cabin 1 in which the head guard device 20 is used will be described mainly with reference to FIGS. 1 to 7.

As shown in FIG. 1, the cabin 1 is a part used for a work machine and operated by an occupant (operator) of the work machine. The work machine in which the cabin 1 is used is, for example, a construction machine that performs construction work, and may be a crane or an excavator. Cabin 1 has a box shape. The cabin 1 includes a roof portion 11. The roof portion 11 is an upper surface portion (roof, ceiling) of the cabin 1. The roof portion 11 is substantially flat. The roof portion 11 includes an outer plate 11a, a skylight 11b, and a support column 11c (see FIG. 5). The skylight 11b is a window for the occupant in the cabin 1 to visually recognize the upper side Z1, and is attached to the outer plate 11a. As shown in FIG. 5, the support column 11c is a portion to which the cabin side component 50 (described later) of the head guard device 20 is attached. The support column 11c projects from the outer plate 11a to the upper side Z1. The upper Z1 end of the support column 11c is arranged on the upper Z1 of the skylight 11b. The details of the direction such as "upper Z1" will be described later.

As shown in FIG. 1, the head guard device 20 is a device for protecting (protecting) the roof portion 11 (particularly the skylight 11b) of the cabin 1 and the occupants in the cabin 1 from falling objects and the like. The head guard device 20 includes a rotation support component 21 (see FIG. 5), a guard 30, and a holding mechanism 40.

The rotation support component 21 (see FIG. 3) is a component that rotatably supports the guard 30 with respect to the cabin 1. As shown in FIG. 5, the rotation support component 21 is, for example, a hinge. The rotation support component 21 is directly or indirectly attached to the cabin 1. For example, the rotation support component 21 is attached to the roof portion 11 (more specifically, the column 11c) of the cabin 1 via the first frame 51 of the cabin side component 50 described later.

As shown in FIG. 1, the guard 30 (head guard, ceiling guard) is a member capable of covering the roof portion 11 (for example, the skylight 11b). The guard 30 has a substantially plate shape as a whole, for example, a substantially rectangular shape. The guard 30 has a net-like shape and a grid-like shape. The guard 30 is rotatably attached to the cabin 1. The guard 30 is rotatable with respect to the cabin 1 about the guard rotation axis A30. The guard 30 is attached to the rotation support component 21 shown in FIG. The guard rotation shaft A30 is a rotation shaft of the rotation support component 21 (see FIG. 5). The guard 30 can be opened and closed with respect to the roof portion 11 (particularly the skylight 11b). The guard 30 can be in a closed state 30A, an open state 30B (see FIG. 2), and an intermediate state between them. The closed state 30A is a state (position) of the guard 30 such that the guard 30 covers the roof portion 11 (covers from the upper side Z1). As shown in FIG. 2, the open state 30B is a state (position) of the guard 30 such that the guard 30 releases the roof portion 11. When the guard 30 is in the open state 30B, there is a workable space between the roof portion 11 and the guard 30. When the guard 30 is in the open state 30B, the worker can easily perform the work related to the roof portion 11, and for example, the worker can easily perform the work (cleaning and the like) related to the skylight 11b. The guard 30 includes a guard main body 31 and a bracket 33 (see FIG. 5).

The guard main body 31 is a main body portion (substantially rectangular or lattice-shaped portion) of the guard 30. The end of the guard body 31 on the side farther from the guard rotation shaft A30 is referred to as the guard tip 31t.

As shown in FIG. 5, the bracket 33 is a portion to which the guard side component 60 is attached. The bracket 33 projects from the lateral outer Yo portion of the guard body 31 to the lateral outer Yo. For example, the bracket 33 has a plate shape extending in the vertical direction Z and the horizontal direction Y (see FIG. 3).

(direction)
As shown in FIG. 2, the direction of rotation (opening / closing direction) of the guard 30 about the guard rotation axis A30 is defined as the opening / closing direction R. In the opening / closing direction R, the direction of rotation of the guard 30 when the guard 30 moves from the closed state 30A (see FIG. 1) to the open state 30B is the opening side RB, and the side opposite to the opening side RB is the closing side RA. .. The direction in which the guard rotation shaft A30 extends is defined as the front-rear direction X. One side in the front-rear direction X is the front side X1, and the side opposite to the front side X1 is the rear side X2. The front-rear direction X may be the same direction as the longitudinal direction of the roof portion 11, the width direction of the roof portion 11 (horizontal direction orthogonal to the longitudinal direction), or any other direction. In the front-rear direction X, the side of the guard 30 away from the central portion in the front-rear direction X is defined as the front-rear direction outer Xo. The direction in which the guard tip portion 31t moves when the guard 30 starts to move from the closed state 30A to the opening side RB is set to the upper side Z1 in the vertical direction Z, and the side opposite to the upper side Z1 is set to the lower side Z2. When the cabin 1 is placed on a horizontal plane, the vertical direction Z coincides with the vertical direction. The direction orthogonal to each of the front-rear direction X and the up-down direction Z is defined as the lateral direction Y. As shown in FIG. 1, in the lateral direction Y, when the guard 30 is in the closed state 30A, the side from the guard rotation axis A30 toward the guard tip portion 31t is the lateral inner Yi, and the side opposite to the lateral inner Yi. Is the lateral outer Yo.

As shown in FIG. 2, the holding mechanism 40 is a mechanism for holding the guard 30 in the open state 30B. The holding mechanism 40 is provided (attached) to the cabin 1 and the guard 30. The holding mechanism 40 includes a cabin-side component 50 and a guard-side component 60.

The cabin side component 50 is a component attached to the cabin 1. The number of cabin-side parts 50 may be one or a plurality. For example, a plurality of cabin-side components 50 (the cabin-side lock portions 55a (see FIG. 5) described later) are provided at intervals in the front-rear direction X. The cabin side component 50 may be provided in two (for example, two symmetrically in the front-rear direction X), or three or more. As shown in FIG. 3, the cabin-side component 50 includes a first frame 51, a second frame 52, a hook portion 55, and a guide portion 57.

As shown in FIG. 5, the first frame 51 is a structure attached to the cabin 1. The first frame 51 is, for example, plate-shaped, and is, for example, L-shaped when viewed from the front-rear direction X. The first frame 51 includes a horizontal plate portion 51a and a vertical plate portion 51b. The horizontal plate portion 51a has a plate shape extending in the lateral direction Y and the front-rear direction X (see FIG. 3). The horizontal plate portion 51a is attached to the support column 11c and fixed to the support column 11c. The horizontal plate portion 51a is attached to the support column 11c by, for example, a fastening member (bolt (not shown)). The vertical plate portion 51b extends from the lateral inner Yi end of the horizontal plate portion 51a to the upper side Z1. The vertical plate portion 51b has a plate shape extending in the vertical direction Z and the front-rear direction X (see FIG. 3). The rotation support component 21 is attached to the vertical plate portion 51b.

The second frame 52 is a structure attached to the cabin 1. The second frame 52 is attached to the cabin 1 (more specifically, the support column 11c) via the first frame 51. The second frame 52 has a plate shape extending in the horizontal direction Y and the vertical direction Z (see FIG. 3). The second frame 52 is fixed to the first frame 51, and is fixed to the horizontal plate portion 51a and the vertical plate portion 51b. The fixing of the second frame 52 to the first frame 51 is, for example, fixing by welding. The configurations of the first frame 51 and the second frame 52 may be variously modified.

The hook portion 55 is a portion on which the lock component 65 (described later) is hung (see FIG. 7). The hook portion 55 is arranged laterally outside Yo with respect to the guard rotation shaft A30. The hook portion 55 is provided, for example, in the second frame 52 (for example, formed), and is provided at the end of the lateral outer Yo of the second frame 52. The hook portion 55 has a concave shape. The hook portion 55 is recessed from the lateral outer Yo end of the second frame 52 to the lateral inner Yi. The hook portion 55 includes a cabin-side lock portion 55a and a cabin-side inversion restricting portion 55b.

As shown in FIG. 7, the cabin-side lock portion 55a is a portion for holding the guard 30 in the open state 30B by contacting (hanging) the guard-side lock portion 65a (described later). Specifically, for example, as shown in FIG. 5, the cabin side lock portion 55a is provided on the inner surface of the hook portion 55. The cabin side lock portion 55a is provided on the upper Z1 portion of the hook portion 55 and is a surface of the upper Z1 portion of the hook portion 55. The cabin-side lock portion 55a may be linear or curved when viewed from the front-rear direction X (the same applies to the cabin-side reversal control portion 55b). The cabin-side lock portion 55a extends, for example, in a direction that coincides with or substantially coincides with the lateral direction Y (details will be described later) (the same applies to the cabin-side reversal regulating portion 55b).

As shown in FIG. 7, the cabin-side reversal control unit 55b limits the movement of the guard 30 to the opening side RB and suppresses the guard 30 from opening too much. More specifically, the cabin-side reversal regulating unit 55b comes into contact with the guard-side reversing regulating unit 65b (described later) when the guard 30 is open at a predetermined angle with respect to the cabin 1 (open state 30B). By this contact, the cabin side reversal regulation unit 55b is configured to restrict the movement of the guard 30 to the opening side RB. Specifically, for example, as shown in FIG. 5, the cabin-side inversion control portion 55b is provided on the inner surface of the hook portion 55. The cabin-side reversal control portion 55b is arranged on the lower side Z2 than the cabin-side lock portion 55a. The cabin-side reversal regulating portion 55b is provided on the lower Z2 portion of the hook portion 55 and is a surface (bottom surface) of the lower Z2 of the hook portion 55.

As shown in FIG. 6, the guide portion 57 guides the guard side component 60. The guide portion 57 comes into contact with the guide contact portion 65c (see FIG. 7, described later) when the guard 30 is rotating to the open side RB, so that the guard side lock portion 65a approaches the cabin side lock portion 55a. Guide the guard side component 60 (details will be described later). As shown in FIG. 5, the guide portion 57 is arranged laterally outside Yo with respect to the guard rotation shaft A30. The guide portion 57 is arranged on Z1 above the hook portion 55. The guide portion 57 is provided, for example, in the second frame 52, for example, in the upper Z1 portion of the second frame 52, and is, for example, the upper surface of the second frame 52 (the surface of the upper Z1). The guide portion 57 is an inclined portion (inclined path) that is inclined with respect to the lateral direction Y so that the guide portion 57 is arranged on the lower side Z2 toward the outer side Yo in the lateral direction.

As shown in FIG. 2, the guard side component 60 is a component attached to the guard 30. The guard side component 60 is rotatably attached to the guard 30. The number of guard-side components 60 is 1 in the example shown in FIG. 2, and may be a plurality. As shown in FIG. 3, the guard side component 60 includes a link portion 61 and a lock component 65.

The link portion 61 connects the guard 30 and the lock component 65. As shown in FIG. 5, the link portion 61 is arranged laterally outside Yo with respect to the guard rotation axis A30. The link portion 61 is rotatably attached to the guard 30 (more specifically, the bracket 33). The link portion 61 and the guard 30 are connected by a pin P. The link portion 61 has, for example, a plate shape extending in the front-rear direction X and the up-down direction Z (see FIG. 3). The rotation axis (of the link portion 61) of the guard side component 60 with respect to the guard 30 is defined as the guard side component rotation axis A60. The direction in which the guard rotation shaft A60 extends is the front-rear direction X, which is the same direction as the direction in which the guard rotation shaft A30 extends. The guard-side component rotation shaft A60 is arranged at a position (distant position) deviated from the guard rotation shaft A30. The number of link portions 61 may be one or a plurality as long as the lock component 65 can be supported, is two in the example shown in FIG. 2, and may be three or more.

As shown in FIG. 5, the lock component 65 is a component that can be hung on the hook portion 55 (see FIGS. 3 and 4). The lock component 65 is a component including a guard-side lock portion 65a (see FIG. 7, which will be described later). As shown in FIG. 5, the lock component 65 is arranged laterally outside Yo with respect to the guard rotation shaft A30. The lock component 65 is arranged at a position (distant position) deviated from the guard side component rotation axis A60. The lock component 65 is rotatably attached to the guard 30 via the link portion 61. The lock component 65 has a rod shape extending in the front-rear direction X (see FIG. 3). For example, the lock component 65 has a columnar shape and is circular when viewed from the front-rear direction X. As shown in FIG. 2, the length of the lock component 65 in the front-rear direction X is the same as or substantially the same as the length of the guard 30 in the front-rear direction X (details will be described later). As shown in FIG. 7, the lock component 65 includes a guard-side lock portion 65a, a guard-side inversion restricting portion 65b, a guide contact portion 65c (see FIG. 6), a connecting portion 65e (see FIG. 2), and an operation portion. 65 g (see FIG. 2).

The guard-side lock portion 65a is a portion that holds the guard 30 in the open state 30B by contacting (hanging) the cabin-side lock portion 55a. The guard side lock portion 65a is provided on the surface of the lock component 65 (it is a part of the surface of the lock component 65), and is provided, for example, on the outer peripheral surface of the lock component 65 (cabin side reversal regulation portion 55b and guide contact portion 65c). The same applies). The guard side lock portion 65a is provided on the surface of the upper side Z1 of the lock component 65 when the guard 30 is in the open state 30B. When the lock component 65 is circular when viewed from the front-rear direction X, the guard-side lock portion 65a has an arc shape (the same applies to the guard-side inversion restricting portion 65b and the guide contact portion 65c). When viewed from the front-rear direction X, the guard-side lock portion 65a may have a curved shape other than an arc shape or a linear shape (the same applies to the guard-side reversal restricting portion 65b and the guide contact portion 65c). Of the lock parts 65, a portion that cannot come into contact with the cabin-side lock portion 55a (for example, the connecting portion 65e shown in FIG. 2 or the operating portion 65g) is not included in the guard-side locking portion 65a shown in FIG. 7.

The number and position of the guard side lock portion 65a corresponds to the number and position of the cabin side lock portion 55a. For example, when a plurality (for example, two) cabin-side lock portions 55a are provided at intervals in the front-rear direction X (see the two cabin-side parts 50 shown in FIG. 2), the guard-side lock portions 65a are also provided in the front-rear direction. It is provided at a plurality of places (for example, two places) at intervals of X. The relationship between the number and position of the guard-side lock portion 65a and the cabin-side lock portion 55a is the same for the relationship between the guard-side reversal regulating portion 65b and the cabin-side reversing regulating portion 55b, and the guide contact portion shown in FIG. The same applies to the relationship between the 65c and the guide portion 57.

As shown in FIG. 7, the guard-side reversing control unit 65b limits the movement of the guard 30 to the opening-side RB and suppresses the guard 30 from opening too much (see the above description of the cabin-side reversing control unit 55b). .. The guard-side reversal regulating portion 65b is provided, for example, on the surface of the lower Z2 of the lock component 65 when the guard 30 is in the open state 30B.

As shown in FIG. 6, the guide contact portion 65c is a portion that comes into contact with the guide portion 57 and is guided by the guide portion 57 (details of the guide will be described later). The guide contact portion 65c is under the lock component 65, for example, when the guard 30 is moving in the opening / closing direction R at a position between the closed state 30A (see FIG. 5) and the open state 30B (see FIG. 7). It is arranged on the side Z2 and the surface of the inner Yi in the lateral direction.

As shown in FIG. 2, the connecting portion 65e is a portion that connects a plurality of guard-side lock portions 65a and 65a. The connecting portion 65e interlocks the states of the plurality of guard-side lock portions 65a and 65a (the state of being in contact with the cabin-side lock portion 55a (see FIG. 7) and the state of not being in contact with each other). The connecting portion 65e is arranged between the plurality of cabin-side parts 50 and 50 in the front-rear direction X. The connecting portion 65e connects a plurality of guard-side reversing regulating portions 65b (see FIG. 7) to each other. The connecting portion 65e connects a plurality of guide contact portions 65c (see FIG. 6) to each other.

The operation unit 65g is a portion of the lock component 65 at or near the end in the front-rear direction X. The operation unit 65g is arranged at a position where the operator can easily operate it by hand. The operation unit 65g is arranged near the end of the guard 30 in the front-rear direction X. The operation unit 65g is arranged as follows, for example. [Arrangement Example 1] The operation unit 65g is arranged outside Xo in the front-rear direction with respect to the cabin-side component 50. [Arrangement Example 1a] As shown in FIG. 2, the operation unit 65g may be arranged on the front side X1 of the most front side X1 of the plurality of cabin side parts 50. [Arrangement Example 1b] The operation unit 65g may be arranged on the rear side X2 of the most rearmost side X2 of the plurality of cabin side parts 50. [Arrangement Example 2] The operation unit 65g is arranged outside Xo in the front-rear direction with respect to the rotation support component 21 shown in FIG. The "cabin side component 50" in the above [arrangement example 1a] and the above [arrangement example 1b] may be read as "rotational support component 21". [Arrangement Example 3] The operation unit 65g shown in FIG. 2 may be arranged on the outer side Xo in the front-rear direction of the cabin side component 50 and on the outer side Xo in the front-rear direction of the rotation support component 21 (see FIG. 3).

(Angle θ)
The cabin-side lock portion 55a and the guard-side lock portion 65a shown in FIG. 7 are preferably configured so as to prevent the cabin-side lock portion 55a and the guard-side lock portion 65a from being separated (disengaged) from each other. Specifically, for example, the cabin side lock portion 55a and the guard side lock portion 65a are configured so that the angle θ is less than 90 °. The angle θ is defined as follows. When the guard 30 is in the open state 30B and viewed from the front-rear direction X, the vector from the center of the lock component 65 (center of the circle) toward the guard-side component rotation axis A60 is defined as the vector V1. When the guard 30 is in the open state 30B, the position where the guard side lock portion 65a and the cabin side lock portion 55a come into contact with each other is defined as the contact position C. When viewed from the front-rear direction X, the vector in the direction in which the cabin-side lock portion 55a at the contact position C extends (tangential direction), and the vector in the lateral direction inward Yi direction is defined as the vector V2. The angle θ is an angle formed by the vector V1 and the vector V2. When the angle θ is less than 90 °, the cabin side lock portion 55a and the guard side lock portion 65a are prevented from being separated from each other as compared with the case where the angle θ is 90 ° or more. Therefore, it is possible to prevent the guard 30 from being accidentally released from being held (locked) in the open state 30B.

(Operation to open guard 30)
The head guard device 20 shown in FIG. 1 is configured to operate as follows. The operation in which the guard 30 is opened from the closed state 30A to the open state 30B (see FIG. 2) and the guard 30 is locked is as follows. The guard 30 is rotated (opened) around the guard rotation shaft A30 to the opening side RB by, for example, human power or a driving device. Then, the guard-side component rotation shaft A60 shown in FIG. 5 rotates about the guard rotation shaft A30 and moves to the lateral outer side Yo and the lower side Z2. At this time, the lock component 65 moves to the lateral outer Yo and the lower Z2 in a state of hanging from the bracket 33. Then, the guide contact portion 65c comes into contact with the guide portion 57.

Further, when the guard 30 is rotated to the opening side RB, the lock component 65 moves (slides down) along the guide portion 57 as shown in FIG. At this time, the lock component 65 moves along the guide portion 57 while maintaining the state of being in contact with the guide portion 57 due to the weight of the guard side component 60. When the lock component 65 moves along the guide portion 57, it moves to the lateral outer Yo and the lower Z2. Then, the guard side lock portion 65a approaches (induces) the cabin side lock portion 55a. The lock component 65 moves to the lateral outer Yo end of the guide portion 57, and then moves to the lower Z2 along the lateral outer Yo end of the second frame 52.

Then, the guard side component 60 performs the lock operation L. The lock operation L is performed on the guard side with respect to the guard 30 so that at least one of the cabin side lock portion 55a and the guard side lock portion 65a (for example, the guard side lock portion 65a) hangs on the other (for example, the cabin side lock portion 55a). This is an operation in which the component 60 rotates (rotates around the guard-side component rotation axis A60). As a result, the lock component 65 moves inward Yi in the lateral direction and enters the hook portion 55 (see FIG. 7). The lock operation L is an operation due to the own weight of the guard side component 60. More specifically, at this time, the center of gravity of the guard-side component 60 (at a position substantially the same as the center of gravity of the lock component 65) is laterally outward Yo with respect to the guard-side component rotation axis A60. Therefore, the guard-side component 60 rotates about the guard-side component rotation axis A60 so that the center of gravity of the guard-side component 60 moves inward Yi in the lateral direction. As a result, the lock component 65 moves inward Yi in the lateral direction and enters the hook portion 55. The guard-side component 60 may perform the lock operation L by the urging force of a spring (not shown) that urges the guard-side component 60, and the guard-side component 60 may perform the lock operation L by the own weight and the urging force of the guard-side component 60. May be good.

(Regulation of reversal of guard 30)
As shown in FIG. 7, when the lock component 65 is inserted into the hook portion 55, the cabin side reversing regulating portion 55b and the cabin side reversing regulating portion 55b are engaged with each other. At this time, the cabin-side reversing regulating unit 55b and the cabin-side reversing regulating unit 55b face each other in the vertical direction Z and come into contact with each other (the contacted state is not shown). In this state, when the force of the opening side RB acts on the guard 30, a compressive force is applied to the link portion 61. In this way, the guard 30 is restricted from moving to the open side RB. Therefore, the guard 30 is restricted from moving from the open state 30B to the open side RB. As a result, it is restricted that the guard tip portion 31t shown in FIG. 2 moves laterally outward Yo from the guard rotation axis A30 (reversal of the guard 30).

(Lock of guard 30)
As shown in FIG. 7, when the lock component 65 enters the hook portion 55, the cabin side lock portion 55a and the guard side lock portion 65a are engaged (locked). At this time, the cabin-side lock portion 55a and the guard-side lock portion 65a face each other in the vertical direction Z and come into contact with each other. At this time, the force of the closing side RA acts on the guard 30 due to the weight of the guard 30. In addition, a force (external force) other than its own weight, which is the force of the closing side RA, may be applied to the guard 30. When the force of the closing side RA acts on the guard 30, tension is applied to the link portion 61. In this way, the guard 30 is restricted from moving to the closed RA. As a result, the guard 30 is held in the open state 30B. As described above, when the guard 30 moves from the closed state 30A to the open side RB and is arranged in the open state 30B, the guard 30 is automatically locked and the guard 30 is held in the open state 30B.

(Unlocking guard 30)
The operation of closing the guard 30 from the locked state to the closed state 30A (see FIG. 1) is as follows. The guard-side component 60 (more specifically, the lock component 65) is moved to the lateral outer Yo by, for example, human power or a driving device. When the guard side component 60 (lock component 65) is manually moved, for example, the operation unit 65 g is operated from the vicinity of the end portion of the guard 30 shown in FIG. 2 in the front-rear direction X. The connecting portion 65e, the link portion 61 (see FIG. 5), and the like may be operated. When the guard side component 60 (lock component 65) shown in FIG. 7 moves laterally outward Yo, the guard side lock portion 65a and the cabin side lock portion 55a are separated from each other, and the lock component 65 is released from the hook portion 55 (the lock is released). Will be released). Then, the lock component 65 shown in FIG. 6 can be moved to Z1 above the hook portion 55. The lock component 65 can move in the direction opposite to the arrow indicated by the alternate long and short dash line in FIG. As a result, the guard 30 can move to the closing RA.

With the lock component 65 disengaged from the hook portion 55, the guard 30 is rotated to the closing RA. Then, the lock component 65 moves along the second frame 52. More specifically, the lock component 65 moves along the lateral outer Yo portion of the second frame 52 to the upper Z1 and then moves along the guide portion 57. After that, the lock component 65 (guide contact portion 65c) shown in FIG. 5 separates from the second frame 52 (guide portion 57) to the upper side Z1. The lock component 65 moves in the direction opposite to the arrow indicated by the alternate long and short dash line in FIG. When the guard 30 is further rotated to the closed RA, the guard 30 is in the closed state 30A as shown in FIG.

(effect)
The effects of the head guard device 20 shown in FIG. 2 are as follows.

(Effect of the first invention)
The head guard device 20 is provided on the roof portion 11 of the cabin 1 of the work machine. The head guard device 20 includes a guard 30, a cabin-side component 50, and a guard-side component 60. The guard 30 is rotatably attached to the cabin 1 so that it can be in a closed state 30A (see FIG. 1) that covers the roof portion 11 and an open state 30B that releases the roof portion 11. The cabin-side component 50 is attached to the cabin 1 and has a cabin-side lock portion 55a. The guard-side component 60 is rotatably attached to the guard 30 and has a guard-side lock portion 65a (see FIG. 7). The rotation axis of the guard 30 with respect to the cabin 1 is designated as the guard rotation axis A30. As shown in FIG. 1, when the guard 30 is in the closed state 30A, the side facing the tip portion (guard tip portion 31t) of the guard 30 on the side far from the guard rotation shaft A30 from the guard rotation shaft A30 is laterally inside Yi. The side opposite to the lateral inner Yi is the lateral outer Yo.

[Structure 1-1] As shown in FIG. 7, in the guard side component 60, the guard 30 rotates in the direction from the closed state 30A (see FIG. 1) to the open state 30B (see FIG. 2) (to the opening side RB). When this is done, the lock operation L is configured to be performed. The lock operation L is an operation in which the guard side component 60 rotates with respect to the guard 30 so that at least one of the cabin side lock portion 55a and the guard side lock portion 65a hangs on the other. The cabin-side lock portion 55a and the guard-side lock portion 65a are configured to hold the open state 30B of the guard 30 by engaging at least one of the cabin-side lock portion 55a and the guard-side lock portion 65a on the other.

[Structure 1-2] When the guard 30 is in the open state 30B, the cabin side lock portion 55a and the guard side lock portion 65a are arranged laterally outward Yo from the guard rotation axis A30.

When the guard side component 60 performs the lock operation L as in the above [Structure 1-1], at least one of the cabin side lock portion 55a and the guard side lock portion 65a is hooked on the other, so that the guard 30 is in the open state. It is held at 30B. As described in the above [Structure 1-2], the cabin side lock portion 55a and the guard side lock portion 65a for holding the guard 30 in the open state 30B are rotated by the guard when the guard 30 is in the open state 30B. It is arranged laterally outside Yo from the axis A30. Therefore, it is not necessary to dispose a member (for example, a refill bar) for holding the guard 30 in the open state 30B on the lateral inner side Yi of the guard rotation shaft A30 shown in FIG. Therefore, when the guard 30 is set to the open state 30B and the work related to the roof portion 11 is performed, it is possible to prevent the member for holding the guard 30 in the open state 30B from becoming an obstacle.

(Effect of the second invention)
[Structure 2] The guard-side component 60 shown in FIG. 7 performs a locking operation L by its own weight of the guard-side component 60.

In the above [Structure 2], a driving device or the like for locking the guard side component 60 is not required. Therefore, the head guard device 20 can be easily configured.

(Effect of the third invention)
[Structure 3] As shown in FIG. 6, the cabin side component 50 includes a guide portion 57. The guide portion 57 contacts the guard side component 60 when the guard 30 is rotating on the opening side RB, and guides the guard side component 60 so that the guard side lock portion 65a approaches the cabin side lock portion 55a.

According to the above [Structure 3], the following effects can be obtained. When the guard 30 is in the closed state 30A (see FIG. 5), the guard side lock portion 65a (see FIG. 7) and the cabin side lock portion 55a are separated from each other. Then, when the guard 30 rotates to the opening side RB, the guide portion 57 guides the guard side component 60, and the guard side lock portion 65a and the cabin side lock portion 55a come close to each other. Therefore, the guard side lock portion 65a and the cabin side lock portion 55a can be brought close to each other only by rotating the guard 30 to the opening side RB (even if no operation other than the rotation of the guard 30 is performed).

(Effect of Fourth Invention)
[Structure 4] As shown in FIG. 7, the cabin-side component 50 includes a cabin-side reversal regulating portion 55b. When the guard 30 is open at a predetermined angle with respect to the cabin 1, the cabin-side reversal regulating portion 55b comes into contact with the guard-side component 60 so that the guard 30 opens more than the predetermined angle (opening side RB). It is configured to regulate the movement of the guard 30 to.

According to the above [Structure 4], the guard 30 is restricted from moving to the opening side RB beyond a predetermined angle. Therefore, for example, it is suppressed that the guard tip portion 31t shown in FIG. 2 is arranged laterally outside Yo of the guard rotation axis A30 (reversal of the guard 30).

(Effect of Fifth Invention)
[Structure 5] A plurality of guard-side lock portions 65a and cabin-side lock portions 55a are provided at intervals in the front-rear direction X, which is the direction in which the guard rotation shaft A30 shown in FIG. 2 extends. The guard-side component 60 includes a connecting portion 65e that connects a plurality of guard-side lock portions 65a to each other.

According to the above [Structure 5], the states of the plurality of guard-side lock portions 65a (the state of being in contact with the cabin-side lock portion 55a (see FIG. 7) and the state of not being in contact with each other) can be interlocked.

(Effect of the sixth invention)
As shown in FIG. 3, the head guard device 20 includes a rotation support component 21. The rotation support component 21 rotatably connects the guard 30 to the cabin 1 shown in FIG. The direction in which the guard rotation shaft A30 extends is defined as the front-rear direction X. In the front-rear direction X, the side of the guard 30 away from the central portion in the front-rear direction X is defined as the front-rear direction outer Xo.

[Structure 6] As shown in FIG. 4, the guard side component 60 includes an operation unit 65 g. The operation unit 65g is arranged on the outer side Xo in the front-rear direction with respect to the rotation support component 21.

According to the above [Structure 6], the operator can easily operate the guard side component 60 from the position of the outer Xo in the front-rear direction with respect to the rotation support component 21. Specifically, for example, when the operation unit 65g is arranged near the end of the guard 30 in the front-rear direction X shown in FIG. 2, the operation unit 65g is operated at a position near the end of the guard 30 in the front-rear direction X. Can be operated by a person.

(Second Embodiment)
The difference between the head guard device 220 of the second embodiment and the head guard device 20 of the first embodiment (see FIG. 5 and the like) will be described with reference to FIGS. 8 and 9. Of the head guard devices 220, the common points with the head guard device 20 (see FIG. 5 and the like) of the first embodiment will not be described. The difference is that, as shown in FIG. 8, the head guard device 220 includes the remote control device 270.

The remote controller device 270 is a device for operating the guard side component 60 from a position away from the guard side component 60 (for example, the lock component 65). The remote control device 270 is a device for releasing the lock by the holding mechanism 40. The remote control device 270 is a device for removing the lock component 65 from the hook portion 55. The remote control device 270 is attached to the roof portion 11. The remote control device 270 includes an unlocking unit 271, an unlocking operation unit 273, an unlocking operation unit support unit 274, and an urging member 275.

The unlocked portion 271 can come into contact with the guard side component 60 (for example, the lock component 65). The lock release portion 271 moves the guard side component 60 in a direction in which the cabin side lock portion 55a and the guard side lock portion 65a are separated from each other when the cabin side lock portion 55a and the guard side lock portion 65a are in contact with each other. Can be configured. The lock release portion 271 moves the lock component 65 in the direction in which the lock component 65 is disengaged from the hook portion 55 (specifically, laterally outer Yo) when the lock component 65 is in the hook portion 55. Is configured to be possible. The unlocking portion 271 is arranged with respect to the lock component 65 on the side opposite to the direction in which the lock component 65 moves when the lock is released (lateral outer Yo) (horizontal inner Yi). The unlocked portion 271 can move in the lateral direction Y. The unlocking portion 271 may be in contact with the lock component 65, for example, may be in contact with the connecting portion 65e shown in FIG. 2, or may be in contact with, for example, the operating portion 65g. The unlocking portion 271 may be in contact with the link portion 61 shown in FIG. The unlocking portion 271 includes an unlocking inclined surface 271a.

As shown in FIG. 9, the unlocking inclined surface 271a is configured to smoothly move the guard 30 to the closing RA when the cabin side locking portion 55a and the guard side locking portion 65a are separated from each other. .. Specifically, the unlocking inclined surface 271a is configured to smoothly move the lock component 65 disengaged from the hook portion 55 to the guide portion 57. More specifically, the unlocking inclined surface 271a moves the lock component 65 in contact with the unlocking portion 271 to the upper side Z1 when the unlocking portion 271 moves to the lateral outer Yo. The unlocked inclined surface 271a is inclined with respect to the vertical direction Z so that the upper side Z1 is arranged on the inner side Yi in the lateral direction.

The unlocking operation unit 273 is a member for operating the unlocking unit 271 from a position away from the unlocking unit 271. The unlocking operation unit 273 extends from the unlocking unit 271 in a direction away from the unlocking unit 271 (for example, laterally inner Yi). The unlock operation unit 273 has, for example, a rod shape (rod) or the like. The unlock operation unit 273 is attached to the roof unit 11 so as to be movable in the longitudinal direction (for example, the lateral direction Y) of the unlock operation unit 273 with respect to the roof unit 11. The unlock operation unit 273 is attached to the roof portion 11 via the unlock operation unit support portion 274. The unlock operation unit 273 may be operated manually, or may be operated by a driving device or the like. The unlock operation unit support unit 274 supports the unlock operation unit 273 with respect to the roof unit 11 so as to be movable in the longitudinal direction (for example, the lateral direction Y) of the unlock operation unit 273. The unlock operation unit support portion 274 may be attached to, for example, the first frame 51 and fixed to the unlock operation unit support portion 274. The unlocking operation portion support portion 274 may be integrally configured with the first frame 51. The unlocking operation portion support portion 274 may be attached to the roof portion 11 (more specifically, the outer plate 11a) and fixed to the roof portion 11.

The urging member 275 urges the unlocked portion 271 shown in FIG. 8 in a direction away from the guard side component 60 (lock component 65) (horizontal inner Yi). The urging member 275 is, for example, a spring. The urging member 275 is arranged, for example, between the unlock operation unit 273 and the unlock operation unit support unit 274. The state shown in FIG. 8 is a state in which the force of the lateral outer Yo is applied to the unlocking operation unit 273 and the urging member 275 is contracted.

(Effect of the seventh invention)
[Structure 7-1] The head guard device 220 includes an unlocking unit 271 and an unlocking operation unit 273. The unlocked portion 271 can come into contact with the guard side component 60. When the cabin side lock portion 55a and the guard side lock portion 65a are in contact with each other, the lock release portion 271 is arranged in a direction in which the cabin side lock portion 55a and the guard side lock portion 65a are separated from each other (for example, laterally outer Yo). It is possible to move the guard side component 60.

[Structure 7-2] The unlocking operation unit 273 extends from the unlocking unit 271 in a direction away from the unlocking unit 271 (for example, inward Yi in the lateral direction).

The unlocking portion 271 of the above [Structure 7-1] can unlock the cabin side locking portion 55a and the guard side locking portion 65a. Then, the unlocking operation unit 273 of the above [Structure 7-2] extends from the unlocking unit 271 in a direction away from the unlocking unit 271. Therefore, by operating the unlocking operation unit 273, the unlocking unit 271 can be operated from a position away from the unlocking unit 271. For example, when the unlocking operation unit 273 is manually operated, the operator can perform the unlocking operation from a position away from the guard side component 60. Further, when the unlocking operation unit 273 is operated by the drive device, the drive device can be arranged at a position away from the guard side component 60, and the degree of freedom in the arrangement of the drive device can be improved.

(Effect of Eighth Invention)
[Structure 8] The head guard device 220 includes an urging member 275 that urges the unlocking portion 271 in a direction away from the guard-side component 60 (for example, inward Yi in the lateral direction).

According to the above [Structure 8], in order for the unlocking unit 271 to move the guard side component 60 to release the lock, it is necessary to apply a force larger than the urging force of the urging member 275 to the unlocking unit 271. Therefore, it is possible to prevent the guard-side component 60 from erroneously moving in the direction of unlocking (accidentally unlocking).

(Modification example)
The above embodiment may be variously modified. The arrangement and shape of each component of the above embodiment may be changed. For example, the number of components may be changed, and some of the components may not be provided. For example, fixing or connecting components may be direct or indirect. For example, what has been described as a plurality of members or parts that are different from each other may be regarded as one member or part. For example, what has been described as one member or part may be provided separately in a plurality of different members or parts.

Specifically, for example, in the above embodiment, the cabin side lock portion 55a, the cabin side reversal control portion 55b, and the guide portion 57 shown in FIG. 5 are provided in the common second frame 52, but they are separate. It may be provided on the member. Further, in the above embodiment, the guard-side lock portion 65a, the guard-side inversion restricting portion 65b, and the guide contact portion 65c (see FIG. 6) shown in FIG. 7 are provided on a part (surface) of the common lock component 65. However, they may be provided on separate members. Further, in the above embodiment, the cabin side lock portion 55a is a part of the hook portion 55 (concave portion), and the guard side lock portion 65a is a part of the lock component 65 (convex portion entering the concave portion). On the other hand, the cabin-side lock portion 55a does not have to be a part of the concave portion, and the guard-side lock portion 65a does not have to be a part of the convex portion. The cabin-side lock portion 55a and the guard-side lock portion 65a may have any shape as long as at least one of the cabin-side lock portion 55a and the guard-side lock portion 65a is configured to hang on the other. Further, the cabin side lock portion 55a may be a part of the concave portion, and the guard side lock portion 65a may be a part of the convex portion that enters the concave portion.

1 Cabin 11 Roof part 20, 220 Head guard device 21 Rotational support part 30 Guard 30A Closed state 30B Open state 31t Guard tip (guard tip)
50 Cabin side parts 55a Cabin side lock 55b Cabin side reversal control part 57 Guide part 60 Guard side parts 65 Lock parts 65a Guard side lock part 65b Guard side reversal regulation part 65c Guide contact part 65e Connecting part 65g Operation part 271 Unlocking part 273 Unlocking operation part 275 Biasing member A30 Guard rotation axis C Contact position X Front-back direction Xo Front-back direction outside Y Lateral direction Yi Lateral direction inside Yo Lateral direction outside

Claims (8)

A head guard device installed on the roof of the cabin of a work machine.
A guard that is rotatably attached to the cabin so that it can be in a closed state that covers the roof portion and an open state that releases the roof portion.
A cabin-side component that is attached to the cabin and has a cabin-side lock.
A guard-side component that is rotatably attached to the guard and has a guard-side lock.
With
The rotation axis of the guard with respect to the cabin is used as the guard rotation axis.
When the guard is in the closed state, the side from the guard rotation axis toward the tip of the guard on the side far from the guard rotation axis is the lateral inner side, and the side opposite to the lateral inner side is the lateral outer side. When you do
The guard-side component is configured to perform a locking operation when the guard rotates in a direction from the closed state to the open state.
The lock operation is an operation in which the guard-side component rotates with respect to the guard so that at least one of the cabin-side lock portion and the guard-side lock portion hangs on the other.
The cabin-side lock portion and the guard-side lock portion are configured to hold the open state of the guard by engaging at least one of the cabin-side lock portion and the guard-side lock portion on the other.
When the guard is in the open state, the cabin-side lock portion and the guard-side lock portion are arranged laterally outward from the guard rotation axis.
Head guard device. The head guard device according to claim 1.
The guard-side component performs the locking operation by its own weight of the guard-side component.
Head guard device. The head guard device according to claim 1 or 2.
The cabin-side component comes into contact with the guard-side component when the guard is rotating in the direction from the closed state to the open state, and the guard-side lock portion is brought closer to the cabin-side lock portion. A guide portion for guiding the guard side component is provided.
Head guard device. The head guard device according to any one of claims 1 to 3.
When the guard is open at a predetermined angle with respect to the cabin, the cabin-side component comes into contact with the guard-side component to move the guard in a direction in which the guard opens from the predetermined angle. Equipped with a cabin-side reversal control unit that is configured to regulate
Head guard device. The head guard device according to any one of claims 1 to 4.
A plurality of the guard-side lock portion and the cabin-side lock portion are provided at intervals in the front-rear direction, which is the direction in which the guard rotation axis extends.
The guard-side component includes a connecting portion that connects a plurality of the guard-side lock portions.
Head guard device. The head guard device according to any one of claims 1 to 5.
The cabin is provided with a rotary support component that rotatably connects the guard.
The direction in which the guard rotation axis extends is the front-rear direction.
In the front-rear direction, when the side of the guard away from the central portion in the front-rear direction is the outside in the front-rear direction,
The guard-side component includes an operation unit arranged outside the rotation support component in the front-rear direction.
Head guard device. The head guard device according to any one of claims 1 to 6.
The guard-side component can be contacted, and when the cabin-side lock portion and the guard-side lock portion are in contact with each other, the guard-side component is separated from the cabin-side lock portion and the guard-side lock portion. With an unlocking part that can move
An unlocking operation unit extending from the unlocking unit in a direction away from the unlocking unit,
To prepare
Head guard device. The head guard device according to claim 7.
An urging member for urging the unlocked portion away from the guard-side component.
Head guard device.

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