JP3461461B2 - Safety equipment for construction machinery - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction in which a gate bar is installed at the entrance of a construction machine so as to be openable and closable, and a position of the gate bar blocks an oil supply passage to a work attachment. The present invention relates to a safety device for a construction machine configured to communicate. 2. Description of the Related Art There is known a construction machine such as a backhoe in which a console is provided beside a driver's seat and an operation lever is provided on the upper surface thereof. In general, in this type of construction machine, the console often becomes a hindrance when getting on and off, so as shown in FIG. To improve the performance.
Further, in this type of construction machine, even when the operation lever 3 on the console box 1 is inadvertently operated during getting on and off,
A gate bar 7 is installed at the entrance 6 of the cabin so as to be rotatable about a horizontal axis in order to shut off pressure oil to a work attachment 5 such as a boom or an arm via the direction switching valve 4. That is, as shown in FIG. 3 to FIG. 5, the opening of the gate bar 7 and the flip-up of the console box 1 are detected by the sensors 8 and 9, respectively, and the respective detection signals are output to the shut-off device 10, and According to 10, when the gate bar 7 opens the cabin entrance 6 (gate open position) or when the console box 1 is flipped up, the pressure oil to the work attachment 5 is shut off, and the operation lever 3 is erroneously operated. Boom, even if operated
It is configured such that operation of a work attachment such as an arm can be prevented. However, in the above configuration, the gate bar 7 cannot be operated to the gate open position in conjunction with the flip-up of the console box 1, and thus has a troublesome disadvantage. Therefore, there arises a technical problem to be solved in order to link the flip-up operation of the console box 1 and the opening / closing operation of the gate bar 7, and an object of the present invention is to solve the problem. SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and is supported by a lower frame fixed to a driver's seat side of a cabin and bouncing. A console frame pivoted to a flip-up position by a biasing force of a lifting spring; a gate bar rotatably supported on the console frame so as to open and close a cabin entrance / exit around a horizontal axis; A gate bar operating lever pivotally supported so as to be rotatable around, a connecting rod connecting the gate bar operating lever and the gate bar, transmitting a turning force of the gate bar operating lever to the gate bar, and rotating; A flip-up lever for restricting flip-up of the console frame when engaged with the locking portion and allowing flip-up when disengaged; Link means for rotating the gate bar operation lever to a position corresponding to the entrance / exit opening position of the gate bar in conjunction with the unlocking of the lock, and detection means for detecting the rotation position of the gate bar operation lever, An object of the present invention is to provide a safety device for a construction machine configured to shut off a supply oil passage to a work attachment when a rotation position of the gate bar operation lever detected by the detection means corresponds to a gate opening position of the gate bar. It is. An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show a frame device (hereinafter, referred to as a frame device) 11 of a console box of a construction machine covered with a cover (not shown), and a lower frame 13 is fixed to a cabin floor 12. 13
A main shaft 14 is horizontally supported on an upper portion of the main body, and a console frame 15 is supported on the main shaft 14. Then, the console frame 1 is stored in the frame device 11.
5 for flipping up the rear of the cabin 5
Are installed, a gate bar device 18 is installed to open and close the entrance 17 of the cabin, and the operation lever L is swingably supported. When the operating lever L is operated, the pilot pressure of the pilot pump (not shown) is guided to the pilot control unit (not shown) of the direction switching valve 40 via the shutoff device 36, and the main hydraulic pump (not shown) is operated. The pressure oil is configured to be led out to a work attachment 45 such as a boom or an arm. [0006] The flip-up device 16 comprises a lower frame 1.
A spring 19 for urging the console frame 15 in the direction of flipping up by urging the console frame 15 with a resilient force with the 3 as a fixed system, and locking the console frame 15 to the lower frame 13 when engaged with each other. The main shaft 14 is provided with a torsion coil spring as a spring, and one of the arms 21 is engaged with the lower frame 13. Then, the other arm 22 is locked to the console frame 15. In this case, the resilience of the spring 19 is such that the console frame 15 jumps up to a predetermined jumping position when the jumping lever 20 is jumped up. The flip-up device 16 includes a groove-shaped engaging portion 2 provided on the front end surface of the cabin of the console frame 15.
4, the flip-up lever 20 is pivotally supported by the console frame 15 so as to be rotatable about a horizontal axis, and further, is engaged with the engaging portion 24 at the tip end of a force point portion 20 </ b> A of the flip-up lever 20. And a section 26. For this reason, when the flip-up lever 20 is turned backward from the front side of the cabin, the engaging portion 26 is disengaged from the locking portion 24. At this time, the pressure of the flip-up spring 19 is accumulated. The console frame 15 is rotated to the flip-up position behind the locking position (hereinafter referred to as the lock position) by the resilient force. Conversely, the console frame 15 is pivoted down to the locked position by pushing down the console frame 15 against the resilience of the flip-up spring 19, and the engaging portion 26 of the flip-up lever 20 is engaged with the locking portion 24 in this locked position. When engaged, the console frame 15 is fixed to the lower frame 13 by the elastic force of the flip-up spring 19. In this case, a second spring 28 is attached to a lever shaft 27 that supports the flip-up lever 20, and one arm 29 of the second spring is locked to the flip-up lever 20, The other arm 30 is locked to the console frame 15. Therefore, only by pushing down the console frame 15 by the elastic force of the second spring 28, the locking portion 2 is automatically
4, the engaging portion 26 of the flip-up lever 20 can be locked. Further, in order to make the locking position of the flip-up lever 20 freely selectable according to the physique and preference of the operator, a large number of locking portions 24 may be formed at predetermined intervals vertically. The gate bar device 18 comprises a gate bar operating lever 31 pivotally supported on a lever shaft 46 mounted horizontally to the console frame 15 so as to be rotatable about a horizontal axis.
And an extension portion 32 extending a predetermined length downward and downward from the front end portion of the console frame 15 via a hinge 33 so as to be pivoted about a horizontal axis.
The gate bar 34 that opens the entrance 17 and the gate bar operation lever 31 and the ends of the gate bar 34 are connected to each other when the gate bar operation lever 31 is turned substantially vertically. The power is transmitted to the gate bar 34 as a turning power, and the gate bar 34 is set at the entrance 1
The connecting rod 37 selectively rotates between a gate opening position for opening the gate 7 and a gate closing position for closing the entrance 17. For this reason, when the gate bar operation lever 31 is turned to the front of the cabin, the gate bar 34 is pulled by the connecting rod 37 and the connecting pin 44 and turns to the horizontal side. It is pushed by 37 and the connecting pin 44 to rotate vertically. Further, a push plate 35 is fixedly provided at the point of force of the gate bar operating lever 31, and a position detecting means 42 such as a switch or a sensor is provided on the console frame 15 as detecting means. The position detecting means 42, as shown in FIG.
The gate bar operation lever 31 is disposed so as to come into contact with the push plate 35 when the gate bar operation lever 31 is rotated to a position corresponding to the gate closing position. When the position detecting means 42 detects the push plate 35, the position detecting means 42
7 does not output a shutoff signal to the shutoff device 36 assuming that the gate 7 is closed by the gate bar 34, and
As shown in FIG. 2, when the push plate 35 is detached,
The gate bar 34 is configured to output the shutoff signal to the shutoff device 36 assuming that the entrance 17 is open. Therefore, when the push plate 35 is detached from the position detecting means 42, the shut-off device 36 determines that the entrance 17 is opened by the operation of the gate bar operating lever 31 and the pilot pump (not shown). ) And the direction switching valve 40. Therefore, when the gate is in the open position, even if the operating lever L is operated, the pilot pressure of the pilot pump (not shown) is not conducted to the pilot control unit of the direction switching valve 40, and the direction switching valve 40 is not switched. . Therefore, the pressure oil of the main hydraulic pump (not shown) returns to the tank without being led out to the work attachment 45 such as a boom or an arm, and the operation of the work attachment 45 becomes impossible. On the other hand, as shown in FIG. 1, the push plate 35 contacts the position detecting means 42, and as a result,
When the push plate 35 is detected, no shut-off signal is output to the shut-off device 36. Therefore, at this time, assuming that the gate bar 34 has been operated to the gate closed position, the shutoff device 36 is held in the open state,
As a result, the pilot pressure of the pilot pump (not shown) is guided to the pilot control unit of the directional control valve 40. Therefore, the direction switching valve 40 is switched, and the pressure oil of the main hydraulic pump (not shown) is led out to the work attachment 45 such as a boom or an arm, and the work attachment 45 becomes operable. Further, in order to rotate the gate bar 34 to the gate open position in conjunction with the flip-up operation of the flip-up lever 20, the tip end of the connecting rod 37 near one end of the connecting rod 37 is located near the pivot of the gate bar operation lever 31. One end of the grooved link 38 is linked to the side by a pin 39, and the groove 43 of the grooved link 38 is movably and rotatably pivoted to a pin 41 fixed to the lower frame 13. The pivoting position corresponding to the gate closing position where the gate bar 34 closes the entrance 17 of the cabin between the position before the flip-up completion position of the flip-up lever 20 and the completion position is set between the groove length of the groove portion 43 and the lifting position. The gate bar operation lever 31 is set to rotate to a position corresponding to a gate opening position where the entrance 17 is further opened. For this reason, as shown in FIG. 1, even when the distal end portion of the flip-up lever 20 is engaged with the locking portion 24 and the console frame 15 is locked to the lower frame 13 at a predetermined angle, the long groove is formed. The escape set in advance in 43 enables the opening and closing of the entrance / exit 17 of the cabin by operating the gate bar 34 independently, and the flip-up operation of the flip-up lever 20 allows the gate bar operation lever 3 to be opened and closed.
1 can be automatically turned from a position corresponding to the closing of the entrance 17 of the cabin to a position corresponding to the entrance opening position for opening the entrance. Therefore, it is possible to improve the getting on and off property and to prevent erroneous operation of the operation lever L. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones. As described in detail in the above embodiment, the present invention enables the console frame to be flipped by a flipping operation of a flipping lever, and link means linked to the flipping. The gate bar operating lever is configured to be operated from the gate closed position to the gate open position by further operating the gate bar operating lever in conjunction with the opening of the gate bar opening / closing opening by the gate bar operating lever in conjunction with the flip-up operation. By being configured to be extended, the work attachments such as the boom and the arm do not operate even when the operation lever is operated. The opening of the mouth and the operation of the boom, arm, etc. Malfunction can be prevented. In a state where the console frame is locked to the lower frame, the gate bar can be selectively rotated between the gate closing position and the gate opening position by the gate bar operating lever, and the gate bar is detected by the detecting means. When the turning position of the gate bar operating lever corresponds to the corresponding position at which the gate bar opens the door, the shut-off signal is derived to the shut-off device. This is an invention that has an extremely significant effect, such as a malfunction of a work attachment such as a boom or an arm due to an erroneous operation of a lever can be reliably prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing one embodiment of the present invention and showing a gate bar opened state of a frame device constituting a console box. FIG. 2 shows the embodiment of the present invention, and is a side view showing a state in which a gate bar is opened and a state in which the frame device is flipped up of a frame device constituting the console box. FIG. 3 is a side view showing a conventional example and showing a gate box closed state of a console box. FIG. 4 is a side view showing a conventional example and showing a console box with a gate bar opened. FIG. 5 is a side view showing the conventional example, showing a state in which the entrance / exit is closed by a gate bar of the console box and the console box is flipped up. [Description of Signs] 13 Lower frame 15 Console frame 17 Cabin entrance / exit 31 Gate bar operating lever 34 Gate bar 36 Shutoff device 37 Connecting rod 38 Link with groove

Claims (1)

(1) A console frame which is pivotally supported by a lower frame fixed to a driver's seat side of a cabin and is rotated to a flip-up position by the biasing force of a flip-up spring. A gate bar rotatably supported on the console frame so as to be rotatable about a horizontal axis to open and close the entrance of the cabin; a gate bar operation lever rotatably supported on the console frame so as to be rotatable about the horizontal axis; A connecting rod that connects the gate bar operating lever to the gate bar and transmits the turning power of the gate bar operating lever to the gate bar, and a connecting rod that rotates, and restricts the console frame from jumping up when engaged with the locking portion of the lower frame. A flip-up lever that allows a flip-up operation when the engagement is released, and the gate bar operation lever is moved in conjunction with the release of the lock of the flip-up lever. Linking means for rotating to a position corresponding to the entrance opening position of the gate, and detecting means for detecting the turning position of the gate bar operating lever, wherein the turning position of the gate bar operating lever detected by the detecting means is A safety device for a construction machine, wherein a supply oil passage to a work attachment is shut off when the gate bar corresponds to a gate open position.