JP7047654B2 - Doorway opening / closing device for construction machinery - Google Patents

Description

The present invention relates to an entrance / exit opening / closing device for a construction machine.

Conventionally, a gate lock device for a construction machine in which a gate bar is provided at an entrance / exit of a cabin has been known (see, for example, Patent Document 1).

In Patent Document 1, the gate bar is rotatably supported around the horizontal axis in the front part of the console box on the entrance / exit side of the cabin, and the gate bar for operating the gate bar is located behind the operation lever of the console box. A configuration is disclosed in which the operation lever is swingably supported and the gate bar operation lever and the gate bar are connected by a connecting rod.

Japanese Unexamined Patent Publication No. 2000-54434

However, in the conventional invention, since the position of the console box in the cabin is fixed, there is a problem that the console box becomes an obstacle and the entrance / exit becomes narrow.

In addition, since the gate bar and the gate bar operation lever are connected by a connecting rod, when the operator pushes down the gate bar, the gate bar operation lever rotates accordingly, and the blocking function of the entrance / exit of the gate bar is released. There is a problem that it will end up.

The present invention has been made in view of this point, and an object thereof is to widen the entrance / exit of the cabin at the time of getting on / off and to prevent the gate bar in the closed position from opening unintentionally. ..

The present invention is intended for an entrance / exit opening / closing device for a construction machine for opening / closing the entrance / exit of a cabin, and the following solutions have been taken.

That is, the first invention comprises a base disposed on the side of the driver's seat of the cabin.
A console box rotatably supported by the base around the box axis,
A gate bar rotatably supported by the console box around the gate bar axis,
An opening / closing lever that rotates the console box between the lowered position during work and the raised position that retracts from the lowered position and widens the entrance / exit of the cabin.
The gate bar is provided straddling the base, and in conjunction with the rotation operation of the console box, the closing position for blocking the entrance / exit and the opening position for opening the entrance / exit are located between the gate bar and the base. A link bar that rotates the gate bar and
It is characterized by being provided with a lock mechanism that locks the console box at a lowered position in conjunction with the rotational operation of the open / close lever.

In the first invention, since the console box is rotated between the lowered position and the raised position by the opening / closing lever, the entrance / exit of the cabin at the time of getting on / off can be widened. Further, in conjunction with the rotation operation of the console box, the gate bar rotates between the closed position and the open position via the link bar. Then, the console box is locked at the lowered position by the lock mechanism in conjunction with the rotation operation of the open / close lever.

As a result, even if the operator tries to push down the gate bar, the rotation operation of the gate bar is regulated by the link bar and the rotation operation of the console box is regulated by the lock mechanism, so that the gate bar is unintentionally regulated. Can be prevented from opening or rotating the console box.

The second invention is the first invention.
The opening / closing lever is rotatably supported by the console box around the opening / closing lever shaft.
It is characterized by having an urging spring that urges only the opening / closing lever to rotate forward from the raised position when the console box is in the raised position.

In the second invention, the opening / closing lever rotates the console box to the raised position by rotating it backward about the opening / closing lever shaft, while rotating the console box to the lowered position by rotating it forward. It is movable. When the console box is in the raised position, only the opening / closing lever is rotated in advance of the raised position by the urging spring.

As a result, after rotating the console box to the raised position, by returning the open / close lever to a position that is easy for the operator to operate, the operability of the open / close lever when rotating the console box to the lowered position Is improved.

The third invention is the first or second invention.
The lock mechanism has an engaging shaft portion provided on the base side and an engaging claw provided on the console box side and which can be engaged with and disengaged from the engaging shaft portion in conjunction with the rotational operation of the opening / closing lever. Has a part and
It is characterized by being provided with an urging spring that urges the engaging claw portion to engage with the engaging shaft portion when the console box is in the lowered position.

In the third invention, when the console box is in the lowered position, the engaging claw portion is urged to engage with the engaging shaft portion by the urging spring. As a result, the console box can be locked in the lowered position while maintaining the engaged state between the engaging claw portion and the engaging shaft portion.

According to the present invention, it is possible to widen the entrance / exit of the cabin at the time of getting on and off, and to prevent the gate bar in the closed position from opening unintentionally.

It is a side view which shows the structure around the cabin of the construction machine which concerns on this embodiment. It is a side view when the console box is in the lowered position and the gate bar is in the closed position. It is a perspective view which shows the structure of the stopper part. It is a side view which shows the state which the lock was released by rotating the opening / closing lever backward. It is a side view when the console box is in the raised position and the gate bar is in the open position. It is a side view which shows the state in the process of rotating a console box from a raised position to a lowered position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

As shown in FIG. 1, a cabin 12 is mounted on the upper swing body 11 of the construction machine 10. On the left side of the cabin 12, an entrance / exit 13 for an operator to get on / off the cabin 12 is opened. The entrance 13 is opened and closed by the door 14. FIG. 1 shows a state in which the door 14 is opened and the entrance / exit 13 is opened.

A traveling lever 17 extending upward from the cabin floor 16 is provided on the front side of the vehicle with respect to the driver's seat 15. By operating the traveling lever 17 in the front-rear direction, the lower traveling body (not shown) can be moved forward or backward. Further, a traveling pedal 18 is provided in the vicinity of the base end portion of the traveling lever 17 on the cabin floor 16. By depressing the traveling pedal 18, the lower traveling body (not shown) can be advanced.

Inside the cabin 12, console boxes 20 are provided on both the left and right sides of the driver's seat 15 (only the left side is shown in FIG. 1). The operation lever 22 for work is provided in the console box 20 so as to project upward, and electrical components such as switches (not shown) are installed inside the console box 20. Further, the console box 20 is provided with an accoudoir stand 23.

The console box 20 is actually composed of a box frame which is a strength member and a synthetic resin cover, and the gate bar 30 and the opening / closing lever 35, which will be described later, are attached to the box frame. Illustration of these detailed box structures is omitted for the avoidance.

A base 25 is fixed on the cabin floor 16. The console box 20 on the left side facing the entrance 13 is a base so as to be rotatable between the lowering position (see FIG. 2) and the raising position (see FIG. 5) during work with the box shaft 21 as the center. It is supported by 25.

Here, the raising position is a position where the entrance / exit 13 is widened by ascending and retreating from the lowering position, and when the operator gets on and off the cabin 12, the console box 20 is set to the raising position.

Further, on the left front side of the driver's seat 15, a gate bar 30 as an entrance / exit opening / closing device for opening / closing the entrance / exit 13 in a barrier manner is provided.

As shown in FIG. 2, the gate bar 30 is centered on the gate bar shaft 31 between a closed position for blocking the entrance 13 (see FIG. 2) and an opening position for opening the entrance 13 (see FIG. 5). It is supported on the upper side surface of the console box 20 so as to be rotatable.

The opening / closing lever 35 is rotatably supported on the left side surface of the console box 20 with the opening / closing lever shaft 36 as the center. Here, when the opening / closing lever 35 is rotated backward, the console box 20 is interlocked and rotated backward by a gear or the like (not shown). Further, when the opening / closing lever 35 is rotated forward, the console box 20 is interlocked to rotate forward. By operating the opening / closing lever 35 in this way, the console box 20 can be rotated between the raised position and the lowered position.

The gate bar 30 and the base 25 are rotatably connected by a link bar 40. The upper end of the link bar 40 is pin-connected to the gate bar 30 via the first link pin 41, and the lower end is pin-connected to the base 25 via the second link pin 42.

Then, the gate bar 30 rotates via the link bar 40 in conjunction with the rotation operation of the console box 20. Specifically, when the opening / closing lever 35 is operated to rotate the console box 20 forward, the link bar 40 pushes the gate bar 30 forward, so that the gate bar 30 rotates to the closed position. The entrance / exit 13 is blocked (see FIG. 2).

Further, when the opening / closing lever 35 is operated to rotate the console box 20 backward, the link bar 40 pulls the gate bar 30 so that the gate bar 30 rotates to the open position and the entrance / exit 13 is opened. It is designed to be open (see Fig. 5).

The console box 20 is locked by the locking mechanism 50 when in the lowered position. The lock mechanism 50 has an engaging shaft portion 51 provided on the base 25 side and a lock plate 55 provided on the console box 20 side.

The engaging shaft portion 51 extends outward from the left side surface of the base 25. An engaging claw portion 56 opened downward is provided on the front portion of the lock plate 55. The lock plate 55 is rotatably supported around the opening / closing lever shaft 36, and the engaging claw portion 56 can be engaged with / detached from the engaging shaft portion 51 in conjunction with the rotational operation of the opening / closing lever 35. ing.

A lower hook of the urging spring 60 is hooked on the rear end portion of the lock plate 55, and the rear end portion of the lock plate 55 is urged so as to be lifted. The upper hook of the urging spring 60 is hooked on the stopper portion 65 provided on the left side surface of the console box 20.

As shown in FIG. 3, the stopper portion 65 is formed of a plate material bent in a concave shape so as to open toward the left. The opening / closing lever 35 is arranged in the recess of the stopper portion 65. The rear portion of the stopper portion 65 is further bent rearward, and the upper hook of the urging spring 60 is hooked on this portion.

Then, as shown in FIG. 2, when the console box 20 is in the lowered position, the rear end portion of the lock plate 55 is lifted by the urging spring 60, so that the engaging claw portion 56 engages with the engaging shaft portion 51. It is being urged to meet. As a result, the console box 20 can be locked at the lowered position while maintaining the engaged state between the engaging claw portion 56 and the engaging shaft portion 51.

The base 25 is provided with a limit switch 68. When the console box 20 is set in the lowered position, the limit switch 68 is activated by contacting the lock plate 55 so that the limit switch 68 can be operated from a state in which the hydraulic system is inoperably locked (so-called hydraulic lock). It is configured to be released.

The opening / closing lever 35 is provided with a disengagement plate 61. The disengagement plate 61 is in contact with the rear portion of the lock plate 55 from above. Then, when the opening / closing lever 35 is rotated backward, the disengagement plate 61 pushes down the rear part of the lock plate 55 against the urging force of the urging spring 60. As a result, the front end portion of the lock plate 55 is lifted, and the engaged state between the engaging claw portion 56 and the engaging shaft portion 51 is released (see FIG. 4).

Then, as shown in FIG. 5, the console box 20 is rotated to the raised position by further rotating the opening / closing lever 35 backward. After that, when the operator releases the opening / closing lever 35, the rear end portion of the lock plate 55 is lifted by the urging force of the urging spring 60.

At this time, since the disengagement plate 61 of the opening / closing lever 35 is in contact with the upper surface of the rear portion of the lock plate 55, when the rear end portion of the lock plate 55 is lifted, the disengagement plate 61 is pushed up. Only the opening / closing lever 35 rotates forward and comes into contact with the front side wall of the stopper portion 65.

In this way, after rotating the console box 20 to the raised position, the opening / closing lever 35 is returned to a position that is easy for the operator to operate, so that the opening / closing when the console box 20 is rotated to the lowered position is opened / closed. The operability of the lever 35 is improved.

FIG. 6 shows a state in which the console box 20 is being rotated from the raised position to the lowered position. While the opening / closing lever 35 is being rotated forward, the front end portion of the lock plate 55 is in contact with the engaging shaft portion 51. When the opening / closing lever 35 is further rotated forward from this state, the console box 20 rotates forward while the front portion of the lock plate 55 is gradually lifted against the urging force of the urging spring 60. Will be. As described above, the engaging claw portion 56 and the engaging shaft portion 51 have a so-called latch structure.

Then, when the console box 20 is rotated to the lowered position, the engaging claw portion 56 of the lock plate 55 engages with the engaging shaft portion 51, and the engaged state is maintained by the urging spring 60 (FIG. FIG. 2).

As described above, according to the entrance / exit opening / closing device of the construction machine 10 according to the present embodiment, the console box 20 is rotated between the lowered position and the raised position by the opening / closing lever 35, so that the cabin 12 at the time of getting on and off The entrance / exit 13 can be widened.

Further, in conjunction with the rotation operation of the console box 20, the gate bar 30 rotates between the closed position and the open position via the link bar 40. Then, in conjunction with the rotational operation of the opening / closing lever 35, the console box 20 is locked at the lowered position by the lock mechanism 50.

As a result, even if the operator tries to push down the gate bar 30, the rotation operation of the gate bar 30 is regulated by the link bar 40, and the rotation operation of the console box 20 is regulated by the lock mechanism 50. Without this, it is possible to prevent the gate bar 30 from opening and the console box 20 from rotating.

<< Other Embodiments >>
The embodiment may have the following configuration.

In the present embodiment, the rotation operation of the console box 20 is converted into the opening / closing operation force of the gate bar 30 by the link bar 40 and transmitted, but a link mechanism in which a plurality of links are combined may be used.

Further, in the present embodiment, one urging spring 60 is used to urge the engaging claw portion 56 to engage with the engaging shaft portion 51, while opening and closing when the console box 20 is in the raised position. Although only the lever 35 is urged to rotate forward, a separate urging spring may be used for each.

As described above, the present invention has a highly practical effect that the entrance / exit of the cabin at the time of getting on / off can be widened and the gate bar at the closed position can be prevented from opening unintentionally. Therefore, it is extremely useful and has high industrial applicability.

10 Construction machinery 12 Cabin 13 Entrance / exit 15 Driver's seat 20 Console box 21 Box shaft 25 Base 30 Gate bar (entrance / exit opening / closing device)
31 Gate bar shaft 35 Open / close lever 36 Open / close lever shaft 40 Link bar 50 Lock mechanism 51 Engagement shaft 56 Engagement claw 60 Bounce spring

Claims (3)

It is a device for opening and closing the entrance and exit of construction machinery for opening and closing the entrance and exit of the cabin.
The base arranged on the side of the driver's seat of the cabin and
A console box rotatably supported by the base around the box axis,
A gate bar rotatably supported by the console box around the gate bar axis,
An opening / closing lever that rotates the console box between the lowered position during work and the raised position that retracts from the lowered position and widens the entrance / exit of the cabin.
The gate bar is provided straddling the base, and in conjunction with the rotation operation of the console box, the closing position for blocking the entrance / exit and the opening position for opening the entrance / exit are located between the gate bar and the base. A link bar that rotates the gate bar and
An entrance / exit opening / closing device for a construction machine, comprising a lock mechanism that locks the console box at a lowered position in conjunction with the rotation operation of the opening / closing lever. In claim 1,
The opening / closing lever is rotatably supported by the console box around the opening / closing lever shaft.
An entrance / exit opening / closing device for a construction machine provided with an urging spring that urges only the opening / closing lever to rotate forward of the raising / closing position when the console box is in the raised position. In claim 1 or 2,
The lock mechanism has an engaging shaft portion provided on the base side and an engaging claw provided on the console box side and which can be engaged with and disengaged from the engaging shaft portion in conjunction with the rotational operation of the opening / closing lever. Has a part and
An entrance / exit opening / closing device for a construction machine provided with an urging spring that urges the engaging claw portion to engage with the engaging shaft portion when the console box is in the lowered position.

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