JPH0624047U - Control equipment for construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] In the conventional control device, it was not possible to lock only the operating lever for the working machine while the control box was in the working state when the engine was operating. There is also a control device with a dismounting cutoff lever in the control box, but since the tilting operation of the dismounting cutoff lever and the control box is operated by separate lever members, the operation is troublesome and inconvenient. This problem is solved. [Structure] In the control device of the present invention, a lever is provided on the front side surface side of the control box so that the limit switch is turned on only when the lever is operated to the front lower end position, and the lever is operated to perform a work operation. The lever lock operation of the lever and the flip-up operation of the control box can be performed separately. Further, a hook portion is provided in the control box so that the hook can be engaged and disengaged reliably.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work control device installed near a driver's seat of a construction machine such as a hydraulic excavator or a work vehicle.

[0002]

[Prior art]

 FIG. 7 is a partially cutaway side view of a driver's cab 1 of a hydraulic excavator (not shown) having a conventional control device. As a configuration of a conventional control device, a control box 3 having an operating lever 2 for a working machine is provided near a driver's seat 4, and a horizontal frame 5 is horizontally provided on an underframe 5 below the driver's seat (4) seat. The control box 3 is attached to the control box 3 such that the control box 3 is rotatable about the horizontal shaft 6 in the front-rear direction, and the limit switch 7 is arranged on the control box 3 to set the control box 3 to the rear end position b. The operation of the limit switch 7 locks the operation lever 2 in an inoperable state when it is tilted up.

FIG. 8 is a circuit diagram showing a lever lock function of the operation lever 2 in FIG. When the driver leaves the driver's seat (4) with the key switch 9 still turned on, the control box (3) is flipped up and tilted to the rear end position (a). Since the limit switch 7 is turned off, the solenoid 11 of the electromagnetic switching valve 10 is de-energized, and the electromagnetic switching valve 10 switches from the open oil passage position B to the tank communication oil passage position C. The pilot pressure from the pilot pump 12 is cut off at the position of the electromagnetic switching valve 10 and does not act on the hydraulic remote control valve 13, so that the operation lever 2 for the working machine can be locked so that it cannot be operated. Therefore, in this case, even if the operating lever 2 is accidentally touched, the working machine of the hydraulic excavator does not start operating, which is safe.

[0004]

[Problems to be solved by the device]

 In the conventional control device shown in FIG. 7, when the control box is flipped up and tilted to the rear end position, the limit switch is turned off to lock the operation lever in the inoperable state. For this reason, it is not safe to say that the driver may come into contact with the operating lever of the control box in the forward tilted state when checking the drawings, documents, etc. while operating the hydraulic excavator. . Further, as another embodiment of the prior art, there is also a control device (not shown) in which a dismounting cutoff lever is provided on the side of the control box and the operation lever for operation of the control box is lever-locked by operating the dismounting cutoff lever. However, it was bothersome and inconvenient to operate because the dismounting lever and the control box had to be tilted separately. The present invention solves the above problems, and a lever is provided on the side of the control box, and the lever can be used to separately perform the lever lock operation of the operation control lever and the control box splash operation. The purpose is to provide a control device.

[0005]

[Means for Solving the Problems]

 In the control device of the present invention, a lever that can prevent the driver from getting off is provided on the front side surface of the control box so as to be rotatable in the front-rear direction, and a limit switch contact plate is fixed to the base end of the lever. The limit switch contact plate is set so that the contact of the limit switch comes into contact only when the lever is operated to the lower end of the front, and the hook bracket has a hook at the bottom of the control box. Is provided so as to be rotatable in the front-rear direction, a rod is provided between the hook bracket and one end of the limit switch contact plate, and an elongated hole is formed in the hook bracket to attach the rod to the elongated hole. The rear end pin can be slidably moved, and when the lever is rotated from the front lower end position to the rear intermediate position, the hook engages with the hook engagement pin fixed to the underframe side. In the mated state, the rear end pin of the rod moves from the rear end of the long hole to the front end, the contact of the limit switch comes out of contact with the limit switch contact plate, and the lever is moved to the upper end position. When the hook is rotated, the hook of the hook bracket is disengaged from the hook engaging pin, and at the same time, the control box is flipped up to the rear end and tilted. Also, when the lever of the control box that is tilted up to the rear end is operated from the upper end position to the front intermediate position, the hook remains in the disengaged state from the hook engagement pin fixed to the underframe, and the rear end pin of the rod. Moves from the front end to the rear end of the slot, the contact of the limit switch maintains the non-contact state with the limit switch contact plate, and when the lever is rotated to the front lower end position, the hook bracket The hook engages with the hook engaging pin to tilt the control box to the front end, and at the same time, the contact of the limit switch contacts the limit switch contact plate. In addition, a hook is attached to the plate of the control box near the hook bracket attachment by biasing it with a spring, and when the hook of the hook bracket is engaged with the hook engaging pin fixed to the underframe side, The hook is located on the back of the hook to ensure the above-mentioned engagement is maintained, and when the hook of the hook bracket is disengaged from the hook engaging pin fixed to the underframe side, The hooks are located on the shoulders of the hooks to ensure that the disengagement is maintained, and when the hooks engage the hook engaging pins, the bar fixed to the hook engaging pin side is fixed. By pressing the hooking portion with a member, the hooking portion is moved from the shoulder portion of the hook to the back portion against the spring force of the spring.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway side view showing a steering device according to the present invention. FIG. 2 is a detailed view of part A of FIG. FIG. 3 is a front view of the main part viewed from B of FIG. FIG. 4 is a side view of a notched main portion showing a state when the lever 14 in FIG. 2 is operated to the b position. FIG. 5 is a side view of a notched main portion showing a state when the lever 14 in FIG. 4 is operated to the c position. FIG. 6 is a partially cutaway side view showing a state in which the control box 15 in the control device of the present invention is flipped up and tilted to the rear end position.

Next, the configuration of the control device of the present invention will be described with reference to FIGS. The control device of the present invention is provided with a control box 15 having an operating lever 16 for a working machine near the driver's seat 17 and a horizontal frame 19 in the left-right direction on the underframe 18 under the driver's seat (17). Is provided, the control box 15 is attached so as to be rotatable in the front-rear direction about the horizontal shaft 19, and the limit switch 20 is arranged with respect to the control box 15. When the control box 15 is tilted rearward, The control device is configured to lock the operation lever 16 in an inoperable state by the action of the limit switch 20, and the lever 14 that can prevent the driver from getting off is rotated forward and backward on the front side surface of the control box 15. The limit switch contact plate 21 is fixedly provided at the base end of the lever 14, and the limit switch contact plate 21 is provided. The contact plate 21 is set so that the contact 22 of the limit switch 20 comes into contact only when the lever 14 is operated to the front lower end position a, and the hook 23 is provided below the control box 15. A hook bracket 24 is provided so as to be rotatable in the front-rear direction, a rod 25 is provided between the hook bracket 24 and one end of the limit switch contact plate 21, and an elongated hole 26 is formed in the hook bracket 24. When the lever 14 is rotated from the front lower end position a to the rear intermediate position b, the hook 23 is formed. The rear end pin 27 of the rod 25 moves from the rear end to the front end of the elongated hole 26 while the engagement state with the hook engagement pin 28 fixed to the underframe (18) is maintained, and When the contact 22 of the switch 20 is not in contact with the limit switch contact plate 21 and the lever 14 is rotated to the upper end position C, the hook 23 of the hook bracket 24 is disengaged from the hook engaging pin 28. At the same time, the control box 15 is configured to be flipped up and tilted to the rear end. A propulsion member, for example, a gas spring 29 is used as a power source for this tilting and tilting.

Further, in the present invention, when the lever 14 of the control box 15 which is flipped up and tilted to the rear end is operated from the upper end position C to the front intermediate position b, the hook 23 is fixed to the underframe (18) side. The rear end pin 27 of the rod 25 moves from the front end to the rear end of the elongated hole 26 while the hook engaging pin 28 is disengaged, and the contact 22 of the limit switch 20 moves to the limit switch contact plate 21. When the non-contact state is maintained and the lever 14 is further rotated to the front lower end position a, the hook 23 of the hook bracket 24 is engaged with the hook engaging pin 28 to tilt the control box 15 forward. At the same time, the contact 22 of the limit switch 20 is configured to come into contact with the limit switch contact plate 21.

Further, in the present invention, a hook portion 32 attached by being biased by a spring 31 is provided on the plate 30 of the control box 15 near the attachment portion of the hook bracket (24), and the hook 23 of the hook bracket 24 is attached to the underframe. When engaged with the hook engaging pin 28 fixed to the (18) side, the hooking portion 32 is positioned at the back portion 2 of the hook 23 so that the engagement can be maintained reliably, and the hook bracket is also provided. When the hook 23 of 24 is disengaged from the hook engaging pin 28 fixed to the underframe (18) side, the hooking portion 32 is positioned on the shoulder portion E of the hook 23 to ensure the maintenance of the disengagement. When the hook 23 engages with the hook engaging pin 28, a bar member (a bolt member or the like) fixedly provided on the hook engaging pin (28) side 3 3 By pushing the hooking portion 32 at, the hooking portion 32 is moved from the shoulder portion E of the hook 23 to the back portion D against the spring force of the spring 31.

Next, the operation of the control device of the present invention will be described. In the first case where the driver performs a work operation, the control box 15 is tilted and fixed to the front end as shown in FIG. 1, and the lever 14 is moved forward so that the driver cannot get off the driver's seat 17 during the operation. The operation lever 16 is operated at the lower end position a. In this case, since the contact 22 of the limit switch 20 is in contact with the limit switch contact plate 21 at the base end of the lever (14), the limit switch 20 is in the ON state. Therefore, an electric circuit (not shown) is energized, and the operating machine of the hydraulic excavator can be moved by operating the operation lever 16. Further, the rear end pin 27 of the rod 25 connected to the limit switch contact plate 21 is at the rear end position of the elongated hole 26 of the hook bracket 24 as shown in FIG. Since the hook 23 of the hook bracket 24 is engaged with the hook engaging pin 28 fixed to the underframe (18) side, and the hook portion 32 presses the back portion 2 of the hook 23 by the spring force of the spring 31, The hook 23 is securely engaged with the hook engaging pin 28, and the control box 15 does not tilt backward.

Next, as a second case, when the driver wants to lock only the operation lever 16 so that the operation lever 16 cannot be operated while the engine (not shown) of the hydraulic excavator is operating, the lever 14 is moved to the front lower end position a. It is further rotated to operate within the range before reaching the rear intermediate position b shown in FIG. As shown in FIG. 4, the hook 23 remains engaged with the hook engaging pin 28 fixed to the underframe (18) side, and the rear end pin 27 of the rod 25 moves from the rear end to the front end of the elongated hole 26. The contact 22 of the limit switch 20 is brought into a non-contact state with the limit switch contact plate 21 while moving to. Therefore, it is possible to lock only the operation lever 16 so that the control box 15 cannot be operated without tilting the control box 15 backward.

Next, as a third case, when the driver wants to dismount while the engine of the hydraulic excavator is operating, the lever 14 is further moved at the time when the lever 14 is rotated to the rear intermediate position b. Rotate to the upper end position c. As shown in FIG. 5, the limit switch 20 is in the off state, but since the rod 25 is pulled forward through the limit switch contact plate 21, the rod 25 rotates about the fulcrum pin 34 of the hook bracket 24 to move the hook. 23 disengages from the hook engaging pin 28. At the same time, the hooking portion 32 rotates about the fulcrum pin 35, so that the hooking portion 32 moves from the back portion D of the hook 23 to the shoulder portion E and holds the hook 23 in the detached state. When the hook 23 is detached, the gas spring 29 is extended. As a result, the control box 15 tilts about the horizontal axis 19 and tilts to the rear end position as shown in FIG. It is safe because the lever 14 will not prevent the driver from getting off the vehicle, and even if the operating lever 16 is touched accidentally, the hydraulic excavator will not move.

Next, as a fourth case, when returning the control box 15 tilted to the rear end position to the front end position, the lever 14 in FIG. 6 is tilted forward from the upper end position C to the intermediate position d. Since the rod 25 is pushed rearward through the limit switch contact plate 21, the rear end pin 27 of the rod 25 moves from the front end of the slot 26 to the rear end. In this state, the limit switch 20 is in the off state, and the detached state of the hook 23 is maintained. If the lever 14 is lowered while maintaining the d position of the lever 14, the control box 15 is pivotally lowered to the front end position. Then, finally, the lever 14 is rotated from the d position to the front lower end position a. As a result, the hook 23 engages with the hook engaging pin 28, and at the same time, the bar member 33 pushes the hook portion 32, so that the hook portion 32 moves from the shoulder portion E of the hook 23 to the back portion D. At the same time, the limit switch contact plate 21 contacts the contact 22 of the limit switch 20, so that the limit switch 20 is turned on and the operation lever 16 can be operated. Further, since the hook portion 32 presses the back portion D of the hook 23 by the spring force of the spring 31, the hook 23 is securely engaged with the hook engaging pin 28, and the control box 15 is moved to the front end position. Can be fixed.

[0014]

[Effect of device]

 In the prior art control device, it was not possible to operate the engine, set the control box in the tilted position during operation, and lock only the operating lever for the working machine inoperable. There is also a control device that has a dismounting cutoff lever in the control box, but the tilting operation of the dismounting cutoff lever and the control box must be done separately, which makes the operation cumbersome and inconvenient. However, in the control device of the present invention, one lever that can prevent the driver from getting off is provided on the front side of the control box, and the limit switch contact plate is fixed to the base end of the lever. The limit switch contact plate is set so that the contact of the limit switch comes into contact only when the lever is moved to the lower front position, and a hook bracket with a hook at the bottom of the control box is rotated in the front-back direction. A rod is provided between the hook bracket and one end of the limit switch contact plate, and an elongated hole is formed in the hook bracket, and the rear end pin of the rod is inserted into the elongated hole. Made possible to slide. Therefore, when the driver wants to check the drawing etc. while operating the engine of the hydraulic excavator and wants to lock the working machine control lever only, the lever is rotated from the lower front position to the intermediate rear position. When the operation is performed within this range, the rear end pin of the rod moves between the rear end and the front end of the elongated hole, so that the limit switch is in the off state although it is a so-called play rotation operation range. Therefore, the control box can be left in the tilted position when operated, and only the work machine operation lever can be locked so that it cannot be operated. Next, when you want to flip up and tilt the control box, rotate the lever to the upper end position. At the same time that the hook of the hook bracket disengages from the hook engaging pin, the control box is tilted to the rear end side by the repulsive force of the gas spring. As described above, in the control device of the present invention, one lever is operated to perform the lever lock operation of the work operation lever and the flip-up operation of the control box (including the operation to return to the original work state). Since they can be performed separately, the operation of the control device is convenient and can be done quickly with one touch.

Further, in the control device of the present invention, a hook portion attached to the plate of the control box near the hook bracket attachment portion by being biased by a spring is provided so that the hook engages with the hook engagement pin. When doing, push the hook on the bar member that is fixed to the hook engaging pin side to pile the spring force of the spring to move the hook from the shoulder to the back of the hook. I chose Therefore, when the hook is engaged with the hook engagement pin, the hooking portion is located at the back of the hook to ensure the maintenance of the engagement, and the hook is disengaged from the hook engagement pin. In some cases, the hooking portion is located on the shoulder portion of the hook to reliably maintain the disengagement, so that safety can be ensured.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a control device of the present invention.

FIG. 2 is a detailed view of part A of FIG.

FIG. 3 is a front view of a main part as seen from B of FIG.

FIG. 4 is a side view of a main part of a notch showing a state when the lever in FIG. 2 is operated to the b position.

FIG. 5 is a side view of a notched main portion showing a state when the lever in FIG. 4 is operated to the c position.

FIG. 6 is a partially cutaway side view showing a state in which the control box in FIG. 1 is flipped up and tilted to a rear end position.

FIG. 7 is a partially cutaway side view of a driver's cab equipped with a conventional control device.

8 is a circuit diagram showing a lever lock function of the operation lever in FIG.

[Explanation of symbols]

 2,16 Operation lever 3,15 Control box 6,19 Horizontal axis 7,20 Limit switch 14 Lever 21 Limit switch contact plate 23 Hook 24 Hook bracket 25 Rod 26 Long hole 27 Rear end pin 28 Hook engagement pin 31 Spring 32 Hook

Claims (3)

[Scope of utility model registration request] 1. A control box equipped with an operating lever for a working machine is provided near the driver's seat, and a horizontal frame is provided in the underframe on the lower side of the driver's seat to rotate in the front-rear direction about the horizontal axis. A control box is mounted so that it can be moved, and a limit switch is arranged for the control box.When the control box is turned over to the rear side, the operation lever is locked by the action of the above limit switch. The control device is equipped with a lever on the front side of the control box, which can prevent the driver from getting off the vehicle, so that it can rotate in the front-rear direction, and a limit switch contact plate is fixed to the base end of the lever. , The limit switch contact plate comes into contact with the limit switch contact only when the lever is operated to the front lower end position. In addition, a hook bracket with a hook is provided at the bottom of the control box so as to be rotatable in the front-rear direction, and a rod is provided between the hook bracket and one end of the limit switch contact plate, and An elongated hole is formed in the hook bracket so that the rear end pin of the rod can be slidably moved in the elongated hole, and when the lever is pivotally operated from the front lower end position to the rear intermediate position, the hook is unsupported. The rear end pin of the rod moves from the rear end of the slot to the front end while the hook engaging pin fixed to the side remains engaged, and the contact of the limit switch does not contact the limit switch contact plate. When the lever is turned to the upper end position,
A control device for a construction machine, characterized in that the hook of the hook bracket is disengaged from the hook engaging pin, and at the same time, the control box is flipped up to the rear end and tilted. 2. The control device for a construction machine according to claim 1, wherein when the lever of the control box which is flipped up and tilted to the rear end is operated from the upper end position to the front middle position, the hook is underframed. The rear end pin of the rod moves from the front end to the rear end of the oblong hole while the hook engagement pin fixed to the side remains disengaged, and the contact of the limit switch is not in contact with the limit switch contact plate. When the lever is rotated to the front lower end position, the hook of the hook bracket engages with the hook engaging pin, tilting the control box to the front end, and at the same time, the contact of the limit switch is released. A control device for a construction machine, characterized in that it is configured to come into contact with a mitt switch contact plate. 3. The utility model registration claim, in the control device for a construction machine according to claim 1 or 2, wherein a hooking portion attached to the plate of the control box in the vicinity of the hook bracket attachment portion by biasing with a spring is provided. When the hook of the hook bracket is engaged with the hook engaging pin fixed to the underframe side, the hooking portion is located at the back of the hook to ensure that the engagement is maintained. When the hook of the bracket is disengaged from the hook engaging pin fixed to the underframe side, the hooking portion is located on the shoulder portion of the hook to ensure the disengagement is maintained.
When the hook engages with the hook engaging pin, the bar member fixed to the hook engaging pin side pushes the hooking portion to hook against the spring force of the spring. A control device for a construction machine, characterized in that the part is configured to be moved from the shoulder part to the back part of the hook.