JP2008025141A - Access shut-off device in working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent attitude of a console box 5 of a hydraulic shovel from being changed from jumping-up attitude to work attitude while a shut-off bar 8 is at shut-off attitude. <P>SOLUTION: The access shut-off device is provided with: a locking hook 22 which closes an opening of a locking groove 14a in a console box lock part while the shut-off bar 8 is at the shut-off attitude, and opens the opening while the shut-off bar 8 is at evacuation attitude. When the shut-off bar 8 is at the shut-off attitude while the console box 5 is at the jump-up attitude, the locking hook 22 blocking the locking groove 14a is abutted on a lock pin 16a from an upper side and regulates the console box 5 in changing its attitude from the jump-up attitude to the work attitude. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  [Technical Field] The present invention belongs to a technical field of a boarding / alighting shut-off device in a working machine provided to prevent a malfunction of a working unit or the like in a working machine such as a hydraulic excavator.

In general, in a working machine such as a hydraulic excavator, when the operator is not in the driver's seat or when the operator gets in or out of the driver's seat, the operating unit is erroneously operated and the working unit suddenly starts moving. In order to prevent this, a blocking bar that can be changed into a blocking posture for blocking the boarding / exiting passage to the driver's seat and a retracting position for retracting from the getting-on / off passage based on lever operation is provided, and the blocking rod is provided to the work machine. The actuator such as a hydraulic cylinder provided can be linked to a hydraulic lock mechanism that locks the actuator in a non-operating state so that the actuator can be operated when the blocking bar is in the blocking position, but the actuator is operated when the blocking bar is in the retracted position. There is one configured so as not to be able to perform (for example, see Patent Document 1).
In some of these work machines, when the work machine becomes smaller, the front space of the console box becomes narrower and it is difficult for the operator to get on and off the driver's seat. There is known a configuration in which the front side is lifted upward from the working posture with the support shaft provided on the support as a fulcrum, thereby widening the front space and making it easier for the operator to get on and off (for example, patents) Reference 2).
JP-A-9-255650 JP 2000-179005 A

  Therefore, it is proposed to adopt the technology of both these patent documents and to configure the console box to change from the working position to the jumping position in a state where the blocking bar is changed from the blocking position to the retracted position. In such a case, it is assumed that the operating tool is operated for some reason in the state where the console box is in the jumping posture, and the blocking bar is changed from the retracted position to the blocking position, and the blocking bar is blocked. If the operation lock is automatically released with the posture, the attachment may be operated unexpectedly, and there is a problem to be solved by the present invention.

The present invention has been created in view of the above-described circumstances in order to solve these problems, and the invention of claim 1 includes a driver seat and at least one side of the driver seat in the left-right direction. A console box that can be transformed into a working posture and a jumping posture, and a console box that is provided in the console box and can be transformed into a blocking posture for blocking the passage side of the console box and a retracting posture for retreating from the passage side. A blocking bar, a blocking bar changing means for changing the blocking bar from the blocking position to a retracted position, a console posture switching means for releasing the console box and switching to the raised position, and the console box When the breaker bar changes from the retracted position to the blocked position while being switched to the raised position, the change that regulates the console box from changing from the raised position to the working position It is passenger blocking device in a working machine, characterized in that the control means.
The invention of claim 2 is provided with a blocking bar operating tool that can be operated between a blocking position and a retracted position for operating the blocking bar deforming means, and the blocking bar operating tool is further operated beyond the retracted position from the blocking position. The boarding / alighting cutoff device for a working machine according to claim 1, wherein the boarding / uninterrupting device is also used as a console operating tool for switching the console box from the working posture to the jumping posture state.
The invention according to claim 3 is provided with a first detection switch for detecting that the blocking bar is operated to the blocking position, and a second detection switch for detecting that the console box is in the working position. 3. The boarding / alighting shut-off device for a working machine according to claim 1 or 2, wherein the hydraulic lock is released only when both detection switches are in a detection state.

According to the first aspect of the present invention, when the blocking bar is operated from the retracted position to the blocking position while the console box is in the raised position, the console box changes from the raised position to the working position. Therefore, it is possible to prevent the actuator from being inadvertently operated.
According to the invention of claim 2, when the blocking bar is operated from the retracted position to the blocking position while the blocking bar operating tool is also used as the console box operating tool, the console box is moved from the jumping position to the working position. It will be regulated to transform into
According to the invention of claim 3, the operation of the actuator is not only performed by operating the blocking bar from the retracted position to the blocking position, but the console box must be changed to the working position. Actuator can be operated properly.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a driver's seat disposed in a cab C of a working machine such as a hydraulic excavator, and the driver's seat 1 can be freely adjusted in the vertical position via a vertical adjustment mechanism (not shown) on the base 2. On the other hand, the base 2 is supported by a seat support 3 installed on the cab floor surface in a state where the front / rear position can be adjusted via a front / rear slide mechanism (not shown). Furthermore, left and right console boxes 5 to which operation levers (joystick levers) 4 are attached are arranged on the left and right sides of the driver seat 1. These left and right console boxes 5 are integrated with the driver seat 1. It is configured to move back and forth and up and down. Further, in the present embodiment, the boarding path to the driver's seat 1 is the front of the left console box 5 so as to get on and off the driver's seat 1 through the front of the left console box 5. The console box 5 on the left side swings between a working posture in which the front side swings up and down and a jumping posture in which it moves up with a support shaft 6 provided at the rear portion of the base 2 as a fulcrum, as will be described later. The present invention has been carried out so that it can be transformed, and therefore, the details of the left console box 5 (hereinafter simply referred to as “console box 5”) will be described below, and the present invention has not been carried out. A description of the right console box 5 is omitted. Of course, it goes without saying that the present invention can be applied to the right console box 5 with respect to a structure in which the passenger can get on and off from the front side of the right console box 5.

  First, the console box 5 is provided with an entrance / exit blocking device 7 for blocking an entrance / exit passage to the driver's seat 1 when the hydraulic lock is released, which will be described later. The hydraulic lock bar (8) is in a shut-off position in which the operation knob 9 is operated to the front shut-off position and protrudes to the front of the console box 5 to block the entrance / exit passage, and in a state in which the operation knob 9 is operated to the rear retracted position In the state of swinging to the retracted position retracted from the getting-on / off passage, and further operating to the rearward jump position beyond the retracted position, the blocking bar 8 jumps up the console box 5 in the retracted position. This configuration is first described.

  A plate 10 is integrally provided on the front upper outer surface of the console box 5, and the bent portion of the operation knob 9 having a substantially L shape with the front and back reversed. The (intermediate portion) is pivotally supported via a support shaft 9a so as to be swingable back and forth, and a grip portion 9c is provided in the upward projecting portion. On the other hand, a locking pin 9b is provided at the front projecting portion of the operation knob 9, but when the operation knob 9 is located at the retracted position, the support shaft is located at a lower front position than the position of the locking pin 9b. A plate-like base end portion 8b of the blocking bar 8 is pivotally supported via 8a so as to be swingable back and forth. Further, a long hole-shaped guide 12 that is located above the position of the support shaft 8a and is inclined to the front, rear, and rear height is provided at the blocking bar base end portion 8b (see the solid line state in FIG. 6). The guide 12 is operated from the retracted position to the jumping position, and the first guide 12a for changing the blocking bar 8 from the retracted position to the blocking position when the operation knob 9 is operated from the retracted position to the blocking position described later. In this case, in order to unlock the console box 5 from the base 2, the second guide 12b for allowing the locking pin 9b to move is formed in a state of communicating in a series.

  Next, the relationship between the operation knob 9 and the blocking bar 8 will be described. When the operation knob 9 is in the retracted position, the locking pin 9b is connected to the lower first guide 12a and the upper first guide 12a. It is located at the communication position 12c with the two guides 12b (see FIGS. 3 and 6). Here, the first guide 12a is formed in a state of being deviated forward toward the lower side with respect to the arc-shaped downward movement locus of the locking pin 9b when the operation knob 9 is swung forward with the support shaft 9a as a fulcrum. Yes. When the operation knob 9 is swung forward with the support shaft 9a as a fulcrum and operated to the blocking position (see FIGS. 2 and 5), the locking pin 9b during the operation reaches the tip 12d of the first guide 12a. In the middle state (the state indicated by the two-dot broken line in FIG. 5), the locking pin 9b moves downward while pressing the lower edge of the first guide 12a, thereby swinging the blocking bar 8 forward and upward. Become. When the operation knob 9 is further operated forward from this intermediate state, the locking pin 9b moves to the communication position 12c while pressing the lower edge of the first guide 12a, whereby the blocking bar 8 protrudes forward. It changes into a posture (refer to the change from the phantom line state to the solid line state in FIG. 5), and in this way, the blocking bar 8 is an abbreviation of the operation (swinging) stroke of the operation knob 9. It is designed to swing and change by a factor of 2, and consideration is given to improving operability. The operation knob 9 is held at the shut-off position and the retracted position by the operation over the dead center of the bullet machine 11 interposed between the locking pin 9b and the support shaft 10a provided on the plate 10. ing. When the operation knob 9 is operated to the shut-off position, it is detected that the first detection switch (first hydraulic lock switch) 13 provided on the plate 10 has operated the operation knob 9 to the shut-off position. The hydraulic lock is released in relation to the second detection switch. Note that when the operation knob 9 is operated from the shut-off position to the retracted position, the operation is opposite to that described above, and the details thereof are omitted.

  On the other hand, the operation in which the console box 5 changes from the working posture to the flip-up posture when the operation knob 9 is operated from the retracted posture to the rearward flip-up posture (see FIGS. 4 and 7) will be described. A lock case 14 is provided on the outer front surface of the console box 5, and a lower end portion of the operating rod 15 is supported on the lock case 14 so as to be movable up and down, and a lock provided on the base 2. A hook 17 that is detachably engaged with the lock pin 16a of the metal fitting 16 is pivotally supported. As will be described later, the hook 17 is unlocked from the locking posture in which the locking means (not shown) is unlocked in conjunction with the upward movement of the operating rod 15 and locked to the lock pin 16a. As a result, the console box 5 can be in a jumping posture in which the front side swings upward with the support shaft 6 as a fulcrum. It should be noted that the console box 5 is automatically transformed into a jumping posture by receiving the stored energy of the damper 18 when the hook 17 is released. On the other hand, when the console box 5 in the raised position is pushed downward, the hook 17 in the released position is forcibly swung in a state where the hook 17 is locked to the lock pin 16a, and the locked position is locked. It is held by means. The operating knob 9 operated to the jumping position automatically swings back to the retracted position when the operating rod 15 is pulled back by an unillustrated ammunition built in the lock case 14 when the operated hand is released. It is supposed to be.

  On the other hand, the upper end of the operating rod 15 is provided with a guide plate 19 having a long hole-shaped third guide 20 that is engaged with the operation knob engagement pin 9b, and the operation knob 9 is moved to the retracted position. In the range that is operated between and the blocking position, the locking pin 9b moves between the upper and lower ends of the third guide 20, and the operating rod 15 is not displaced, but the retracted position. When the operation knob 9 located in the position is swung backward and operated to the jumping position, the locking pin 9b moves upward as it is in contact with the upper end of the third guide 20, and thereby the guide plate 19 is moved upward together with the operating rod 15, and as described above, the hook 17 is transformed into the unlocked posture, and the console box 5 is switched from the working posture to the jumping posture. In this case, the locking pin 9b moves the second guide 12b formed along the movement locus of the locking pin 9b with respect to the guide 12 formed on the blocking bar base end 8b. Thus, the blocking bar 8 does not move and is maintained in the retracted position.

  Next, a restriction mechanism for restricting the console box 5 from being in the working position when the blocking bar 8 is in the blocking position in the jumping position will be specifically described. First, the upper end of the operating rod 21 is pivotally supported by the operation knob 9 via the support shaft 21a so as to be positioned between the support shaft 9a and the locking pin 9b. On the other hand, the base end portion of the locking hook 22 is pivotally supported by the lock case 14 via a support shaft 22a. The lower end is pivotally supported via a support shaft 21b.

  When the console box 5 is in the working position, the blocking bar 8 is in the blocking position, and the hook 17 is locked to the lock pin 16a, as shown in FIG. The portion 22b penetrates the lock pin 16a, and closes the opening of the engagement groove 14a opened at the lower side where the hook 17 formed on the lower edge of the lock case 14 faces. When the operation knob 9 is operated to the retracted position in this state, the operating rod 21 is moved up in conjunction with the operation, whereby the locking hook 22 comes out of the lock pin 16a and opens the opening of the engagement groove 14a. As much as possible, it swings rearward and upward (see FIG. 8B).

When the operation knob 9 is further operated rearward to the jumping position, the hook 17 is disengaged from the lock pin 16a as described above, and the console box 5 is in the jumping posture and the engaging hook 22 is engaged. Oscillates further rearward and upward (see FIG. 9A), and the console box 5 moves to a position spaced upward from the lock pin 16a when the console box 5 is in the jumping posture.
When the operation knob 9 is operated to the blocking position due to some factor in the jumping posture of the console box 5 as described above, the blocking bar 8 protrudes forward to be in the blocking posture as described above. Thus, the operating rod 21 moves downward, whereby the locking hook 22 swings forward with the support shaft 22a as a fulcrum at a position away from the lock pin 16a to close the opening of the engagement groove 14a. It moves to the position (see FIG. 9B). In this state, when the console box 5 is pushed down to change from the jumping posture to the working posture, the tip end portion of the locking hook 22 closing the opening of the engaging groove 14a comes into contact with the lock pin 16a. The lock pin 16a is prevented from entering the engaging groove 14a, thereby restricting the console box 5 from being raised to the working position in a state where the blocking bar 8 is in the blocking position. .

  The lock case 14 is provided with a second detection switch (second hydraulic lock switch) 23. The second detection switch 23 is connected in series with the first detection switch 13 described above (if it is an AND connection). Good). When the console box 5 is in the working posture, the second detection switch 23 is closed by contacting the projection 16b provided on the lock fitting 16, but the console box 5 swings upward from the working posture. In this case, the opening is separated from the protrusion 16b. When the console box 5 is in the working posture, the second detection switch 23 is closed, and the operation knob 9 is operated to the shut-off position and the first detection switch 13 is closed, the hydraulic lock is activated. The circuit is set so that the hydraulic lock state is maintained when the switch is released and at least one of the detection switches 13 or 23 is open.

  In the embodiment of the present invention configured as described above, when the operator sitting on the driver's seat 1 operates the operation knob 9 in the retracted position with the console box 5 in the working position to the blocking position, the blocking bar 8 is It protrudes forward to be in a blocking posture, obstructing the operator to get in and out of the driver's seat 1, and the first detection switch 13 is activated to release the hydraulic lock, so that the necessary actuator work can be performed. On the other hand, when the operator stops driving and gets off from the driver's seat 1, when the operation knob 9 is further operated from the retracted position to the jumping position, the hooks 17 and the engagement hooks 22 are released from being locked to the lock pin 16a. The box 5 is switched from the working posture to the jumping posture, and is flipped up by receiving the stored energy of the damper 18, so that the operator can easily get on and off using the wide front space of the console box 5 as a passage. .

  In the case where the present invention is thus implemented, when the operator gets on and off, it is possible to switch the blocking bar 8 to the retracted position and switch the console box 5 to the raised position by operating the operation knob 9. However, when the blocking bar 8 is changed from the retracted position to the blocking position while the console box 5 is switched to the jumping position, the locking hook 22 closes the opening of the locking groove 14a facing the hook 17. Thus, the console box 5 is restricted from being in a working posture. As a result, it is possible to prevent the hydraulic lock from being released by switching the console box 5 from the jumping position to the working position while the blocking bar 8 is in the blocking position.

  In addition, since the operation knob 9 is a dual-use type that can perform a change operation between the retracting posture and the blocking posture of the blocking bar 8 and a switching operation from the working posture of the console box 5 to the jumping posture, the operability is improved. It will be excellent. Moreover, in this case, the hydraulic lock is not released only by operating the operation knob 9 to the shut-off posture and closing the first detection sensor 13, and the console box 5 is in the working posture and the second detection sensor 23 is closed. If the state is not achieved, the hydraulic lock is not released, so that the hydraulic lock is reliably released.

  Of course, the present invention is not limited to the above-described embodiment, and an operation tool for changing the blocking bar into the retracted position and the blocking position, and the console box from the working position to the jumping position. Needless to say, the operation tool for switching to the above is not a dual-purpose type and can be implemented separately.

It is a side view of a driver's seat part. It is a side view of the driver's seat part of the interruption state. It is a side view of the driver's seat part which shows an evacuation state. It is a side view of the driver's seat part which shows the jumping state. It is an enlarged side view of the operation knob part which shows the interruption | blocking state. It is an enlarged side view of the operation knob part which shows a retracted state. It is an enlarged side view of the operation knob part which shows a flip-up state. (A) is an enlarged side view of the console lock portion in the shut-off state, and (B) is an enlarged side view of the console lock portion in the retracted state. (A) is an enlarged side view of the console lock part in the jumped-up state, and (B) is an enlarged side view of the console lock part in a state of restricting movement to the work position in the blocking position. It is a front view of a console box part. It is a perspective view of a console lock part.

Explanation of symbols

5 Console box 8 Blocking bar 9 Operation knob 13 First detection switch 14 Lock case 16a Lock pin 17 Hook 22 Locking hook 23 Second detection switch

Claims (3)

  A driver's seat, a console box provided at least on one side of the driver's seat in the left-right direction and freely transformable into a working posture and a jumping posture, and a shut-off provided in the console box for blocking the passage side of the console box A blocking bar that can be changed into a posture and a retracted position retracted from the passage side, a blocking bar changing means that changes the blocking bar from the blocking position to the retracted position, and the console box is released by releasing the working position. Console posture switching means for switching to the raised posture state, and when the blocking bar changes from the retracted posture to the blocked posture while the console box is switched to the raised posture, the console box changes from the raised posture to the working posture A boarding / alighting shut-off device for a working machine, characterized in that it is provided with a deforming shape regulating means for regulating the operation.   In order to operate the blocking bar deforming means, a blocking bar operating tool that can be operated between a blocking position and a retracted position is provided, and the blocking bar operating tool further operates from the blocking position beyond the retracted position to operate the console box. 2. The boarding / alighting shut-off device for a working machine according to claim 1, wherein the boarding / uninterrupting device is also used as a console operating tool for switching from a posture to a jumping posture state.   A first detection switch that detects that the blocking bar has been operated to the blocking position and a second detection switch that detects that the console box is in the working position are provided. 3. The boarding / alighting shut-off device for a working machine according to claim 1 or 2, wherein the hydraulic lock is released only when it is in the state.

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