JP4535457B2 - Entrance / exit blocking device for work machine - Google Patents

Description

  The present invention belongs to the 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.

Generally, 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 prevented from being accidentally operated and the working part suddenly starts moving. Therefore, a blocking posture that can be changed into a blocking posture that blocks the entry / exit passage to the driver's seat based on lever operation and restricts the entry / exit of the operator, and a retracting posture that allows the operator to get on / off by retracting from the getting-on / off passage While the bar is provided, the blocking bar is linked to an operation lock mechanism that locks an actuator such as a hydraulic cylinder provided in the work machine in a non-operating state, and the actuator can be operated when the blocking bar is in the blocking posture. There is a configuration in which the actuator cannot be operated when the blocking bar is in the retracted posture (see, for example, Patent Document 1).
In such work machines, when the work machine is small, the front space of the console box becomes narrow 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 work posture with the provided support shaft as a fulcrum, thereby widening the front space and making it easier for the operator to get on and off (for example, Patent Documents) 2).
Japanese Patent Laid-Open No. 9-025650 JP 2000-179005 A

  Therefore, it is proposed to provide both a blocking bar operating means for operating the blocking bar and a console attitude switching means for switching the attitude of the console box. However, the conventional console attitude switching means is located in front of the joystick lever. Therefore, since there are two kinds of operation means, that is, a blocking bar operation means and a console posture switching means, the number of parts is large and the cost is increased, not only the space is deteriorated but also the operability is deteriorated. There is also a problem to be solved here.

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 breaker bar, a breaker bar changing means for changing the breaker bar from a blocking position to a retracted position, and a console posture changing means for releasing the console box to switch to a jumping posture state. blocking bar operating tool for operating the Hensugata means, when used also to console operating tool for operating the console posture switching means, the blocking bar and blocking bar operation device, the console box In the state which is switched to up position, a passenger blocking device in the working machine, wherein a be Hensugata the blocking position from the retracted position is configured to be regulated.
The invention according to claim 2 is characterized in that the blocking bar operating tool is also used as a console operating tool so as to switch the console box to the flip-up posture state by further operating beyond the retracted position from the blocking position. The boarding / alighting shut-off device for a work machine according to claim 1.

By setting it as invention of Claim 1, since the interruption | blocking bar operation tool will be combined with a console operation tool, the number of parts will reduce and operativity will also improve. In addition, when the console box is switched to the jumping position, the blocking bar and the blocking bar operating tool are prevented from changing from the retracted position to the blocking position, thereby avoiding unintended operation by the operator. Can do.
According to the invention of claim 2, by the series of operations of further operating the blocking bar operating tool from the blocking position beyond the retracted position, the blocking bar can be transformed into the retracted position and the console box can be in a jumping posture. As a result, operability is further improved.

  Next, an embodiment of the present invention will be described with reference to FIGS. In the drawings, reference numeral 1 denotes a driver's seat disposed in a cab of a work machine such as a hydraulic excavator, and the driver's seat 1 is supported by a base 2 through a vertical adjustment mechanism (not shown) so that the vertical position can be freely adjusted. 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 an action posture in which the front side swings up and down and a lift-up posture in which the front side swings 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 is needless to say 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 this state, when the swing bar is changed to the retracted position retracted from the entrance / exit passage and is further moved to the rearward raising 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, the blocking bar base end portion 8b is positioned above the position of the support shaft 8a. Thus, a long hole-shaped guide 12 that is inclined in a front-rear and rear-high state is provided (see the solid line state in FIG. 5). The guide 12 includes a 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, and when operating from the retracted position to the jumping position. Further, the second guide 12b for releasing the locking of the console box 5 with the base 2 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 the solid line state in FIG. 5). 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. Then, when the operation knob 9 is swung forward with the support shaft 9a as a fulcrum and is operated to the blocking position, the operation pin 9b is in the middle of the operation until it reaches the tip 12d of the first guide 12a (see FIG. 4). In the two-dot broken line state), the locking pin 9b moves downward while pressing the lower edge of the first guide 12a, and the blocking bar 8 swings forward and upward. 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. 4). By doing so, the blocking bar 8 is double the operation (swinging) stroke of the operation knob 9. It is designed to swing only, 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 point 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, the detection switch (hydraulic lock switch) 13 provided on the plate 10 detects that the operation knob 9 has been moved to the shut-off position, thereby releasing the hydraulic lock. It is supposed to be. 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, an operation will be described in which the console box 5 changes from the work posture to the flip-up posture when the operation knob 9 is operated from the retracted posture to the rear flip-up posture. 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 a 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 operation knob 9 operated to the jumping position is configured to automatically return and swing to the retracted position by the restoring force of the ammunition 11 when the operated hand is released.

  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.

  A cam 21 is arranged in the vicinity of the lower part of the blocking rod support shaft 8a. The cam 21 is pivotally supported on the plate 10 by a support shaft 21a so as to be swingable. One end (upper end) is connected. The cam 21 is wound around the support shaft 21a, and is biased so that the tip 21b faces upward by an elastic machine 23 having one end supported by the plate 10 and the other end supported by the cam 21. The stopper 21c protruding from the outer periphery of the base end is in contact with a stopper pin 10b provided on the plate 10 so that the stopper 21c is positioned and held at the lock position. In this locked position, the cam 21 is in contact (adjacently opposed) to the lock body 8c provided on the base end portion 8b of the blocking bar and assumes a regulating posture, whereby the blocking bar 8 changes from the retracted position to the blocking position. It has come to regulate. On the other hand, as will be described later, when the cam 21 swings downward against the ammunition 23, the cam 21 is separated from the lock body 8c to be in an allowable posture, thereby blocking from the retracted posture of the blocking bar 8. Changes to posture are allowed.

  On the other hand, an operating body 24 formed in an inverted L shape is pivotally supported via a support shaft 24 a at a position near the lock case 14 of the console box 5, but at the base end of the operating body 24. The other end portion (lower end portion) of the connecting body 22 is integrally connected, so that the cam 21, the connecting body 22, and the operating body 24 operate in conjunction with each other. As described above, when the console box 5 is in the jumping posture, the distal end portion 24b of the operating body 24 is separated from the lock fitting 16, so that the cam 21, the connecting body 22 and the operating body 24 are The console box 5 is restricted from operating the operating knob 9 from the retracted position to the blocking position and from changing the blocking bar 8 from the retracted position to the blocking position in the restricted posture in response to the urging force. , The hook 17 engages with the lock pin 16, and the console box 5 is linked from the jumping posture to the working posture (non-raising posture), so that the distal end portion 24 b of the operating body 24 is locked. The operating body 24, the cam 21, and the connecting body 22 are brought into an allowable posture against the urging force of the bullet machine 23 by contacting the metal fitting 16, so that the operation knob 9 is retracted. And that the blocking bar 8 is operated to al blocking position is adapted to be allowed to Hensugata the blocking position from the retracted position.

  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 detection switch 13 performs a detection operation to release the hydraulic lock, so that 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 operating knob 9 is operated from the blocking position to the retracted position, the blocking bar 8 changes from the blocking position to the retracted position, and the detection switch 13 is switched. Even if the operation lever 4 is operated in the hydraulic lock state, the hydraulic actuator does not operate. However, when the operation knob 9 is further moved to the jumping position beyond the retracted position, the lock pin 16 of the hook 17 is operated. The console box 5 is switched from the working posture to the jumping posture, and the console box 5 is flipped up by the accumulated force of the damper 18, thereby allowing the operator to pass through the wide front space of the console box 5. As a result, you can get on and off easily.

  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, the operation of changing the shape of the blocking bar 8 and the operation of switching the console box 5 to the jumping posture can be performed by a series of operations of the operation knob 9. As a result, the operation tool can be used in combination. An operation tool is not required, the number of parts is reduced, and operability is improved.

  Moreover, in this case, in a state where the console box 5 is switched to the jumping posture, the blocking rod 8 is restricted from changing from the retracted posture to the blocking posture, that is, the operating body distal end portion 24b is locked to the lock fitting 16. As a result of the restriction, the cam 21 automatically moves upward upon receiving the urging force of the bullet machine 23 and comes into contact with the lock body 8c. Thus, it is possible to avoid the case where the blocking bar 8 is inadvertently changed to the blocking posture and the hydraulic lock is released in a state in which is switched to the jumping posture.

  In addition, when the console box 5 is switched to the jumping position, the operation knob 9 is operated from the retracted position to the blocking position together with the restriction that the blocking bar 8 changes from the retracted position to the blocking position. As a result, as soon as the console box 5 is changed from the jumping position to the working position while the operation knob 9 is operated to the blocking position, the blocking bar 8 changes to the blocking position and the hydraulic lock is applied. It is possible to avoid an operation that is not intended by the operator that would cause the release of.

  Further, as described above, the operation knob 9 is a dual-purpose 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. However, in the state where the console box 5 is switched to the jumping posture, the operation from the retracted position to the shut-off position is restricted with respect to the dual operation knob 9. When the console box 5 is returned to near the working position but is not in the working position, the operator cannot operate the operation knob 9 from the retracted position to the blocking position by misunderstanding that the console box 5 is in the working position. As a result, the user notices that the console box 5 is not in the working posture.

It is a side view of the driver's seat site | part which shows the interruption | blocking 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 part in the locked state, (B) is an enlarged side view of the console lock part in the jumped up state. It is an enlarged side view of the principal part which shows a jumping state. It is an enlarged side view of the principal part which shows the interruption | blocking state. It is an enlarged side view of the principal part which shows a retracted state. It is a principal part expansion perspective view which shows the operation knob site | part which shows a raising state. It is a principal part expansion perspective view which shows the operation knob site | part which shows a retracted state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driver's seat 5 Console box 6 Support shaft 7 Boarding / alighting-blocking device 8 Blocking bar 9 Operation knob 13 Detection switch 14 Lock case 16 Lock metal fitting 17 Hook 21 Cam 22 Connection body 23 Ammo 24 Actuator

Claims (2)

The driver ’s seat,
A console box provided on at least one side of the driver's seat in the left-right direction and freely transformable between a working posture and a jumping posture;
A blocking bar provided in the console box, which is freely changeable between a blocking posture for blocking the passage side of the console box and a retracting posture for retracting from the passage side,
Blocking bar changing means for changing the blocking bar from a blocking position to a retracted position,
Console posture switching means for releasing the console box from the working posture and switching to the jumping posture state,
The blocking bar operating tool for operating the blocking bar changing means is also used as a console operating tool for operating the console posture switching means .
The blocking bar and the blocking bar operating tool are configured to be restricted from changing from a retracted position to a blocking position when the console box is switched to a jumping position. A boarding / shut-off device for work machines.   The breaker bar operating tool is also used as a console operating tool to switch the console box to a flip-up posture state by further operating from the blocking position beyond the retracted position. A boarding / shut-off device for work machines.

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