JP2000319939A - Travel lever lock device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitutionally simple, compact and hardly troubling gate lock device when arranging gate lock levers on the left/right both sides of an operation seat. SOLUTION: Gate lock levers 70, 71 are arranged on the left/right both sides of a seat, a lock device for preventing erroneous operation of a travel lever 51 is mechanically connected to the gate lock levers 70, 71, and a member having cutout parts 53a, 54a is fixed to the travel lever so as to lock the travel lever 51 when operating either one of left/right lock levers 70, 71 to the lock side. Then, lock members are arranged in the respective cutout parts so as to be engageable and lockable/releasable, a spring means is arranged to hold the lock members in an engaging state, and the respective gate lock levers and the lock members are connected by a pull cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a safety lock device for a traveling lever in a construction machine capable of getting on and off from both right and left sides.

[0002]

2. Description of the Related Art A lock device for locking an operation lever has been conventionally employed in a conventional construction machine in order to ensure safety when an operator gets off the construction machine. In recent years, a locking device has also been adopted for a traveling lever for controlling a traveling hydraulic motor.
In addition, among conventional construction machines, there is also a construction machine in which a working machine base end is provided at a front end of an upper revolving structure, particularly for a small-sized construction machine, so that the operator can get on and off from both right and left sides. Also in this case, it is desirable to lock the traveling lever by providing lock levers on both the left and right sides to ensure safety. Hereinafter, a conventional traveling lever lock device will be described.

Japanese Patent Publication No. 2582937 discloses a traveling lever lock device as shown in FIGS. 8 and 9 (hereinafter referred to as a conventional device 1). In the figure, a traveling lever 11 is rotatably supported by a rotation support shaft 12 provided below a floor 13. A pedal 14 for operating the travel lever is provided below the travel lever and on the floor. A member 15 is provided below the rotation support shaft of the traveling lever 11 so as to extend downward. One end of a cable 16 is attached to the member 15, and the other end of the cable 16 is connected to a traveling direction switching valve (not shown).

The member 15 is inserted into a "earth" -shaped slot 18 provided in the plate 17 so as to be freely movable in the left-right direction in FIG. A spring 19 and a pull cable 20 are connected to both sides of the plate 17. When the plate 17 is pulled by the pull cable 20 in the direction of arrow A (the state shown), the lock is released, and the pull cable 2
When 0 is loosened, the plate 17 is pulled in the direction of arrow B by the spring force, and the traveling lever 11 is locked.

A console box 21 is placed on the floor 13.
Is provided, and a control device is provided inside the console box 21. A turning operation lever 22 is provided on the upper front side of the console box 21.
A lock lever 24 is rotatably provided in front thereof by a rotation support shaft 25. A member 26 is fixedly mounted on the rotation support shaft 25, one end of a rod 27 is connected to the member 26, and the other end is a lock valve 2 that shuts off the primary pressure of the pilot hydraulic pressure.
8. A link 29 is fixed to the rotation support shaft 25, and one end of the pull cable 20 is connected to a lower end of the link 29.

[0006] With the above-described configuration, the conventional device 1 has a locking function as follows. That is, when the lock lever 24 is raised in the locking direction (turned clockwise), the tip of the link 29 moves leftward, and the pull cable 20 is loosened. The plate 17 is moved in the direction of arrow B by the spring 19, and the member 15 comes to the narrow portion of the soil-shaped slot. Therefore, the member 15
9, the movement in the left-right direction in FIG. 9 is restricted, and the traveling lever 11 is locked. At the same time, the lock valve 28 is locked by the operation of the member 26.

FIG. 10 is a public utility model publication No. 7-158.
No. 59 shows another conventional apparatus (hereinafter, referred to as conventional apparatus 2). In FIG. 10, the same components as those of the conventional device 1 are denoted by the same reference numerals, and the description will be simplified.
In FIG. 10, a pedal 14 is fixed below the traveling lever 11 and is rotatably supported by a support pin 31. Below the floor 13, a lower plate 32 is fixedly provided below the traveling lever 11. Lower plate 3
2, one end of the pull cable 16 is connected, and the other end is connected to the traveling direction switching valve.

The engagement receiving portion 3 is provided on the lower surface of the lower end of the lower plate 32.
3 are provided. A deceleration motor 34 is provided at an appropriate position on the floor 13, a link 36 is connected to a drive shaft 35 of the deceleration motor 34, and an engagement protrusion 37 that engages with the engagement receiving portion 33 is provided at the tip of the link 36. Have been. Deceleration motor 3
Numeral 4 is rotatable forward and backward, and is operated by a limit switch provided on a lock lever (not shown). That is, when the gate lock lever is locked (a state in which the operator can get off the vehicle), the link 36 rotates counterclockwise.

When the traveling lever 11 is in the neutral state, the engaging projection 37 engages with the engagement receiving portion 33 and the traveling lever 1
Lock 1 When the gate lock lever changes from the locked state to the unlocked state, the limit switch is turned off, the link 36 rotates clockwise, and the engaging projection 3
7 is disengaged from the engagement receiving portion 33, and the traveling lever 11 becomes operable.

In addition, the switching operation of the gate lock lever is detected by an electric signal, and when the gate lock lever is operated to the lock side, a hydraulic circuit from the hydraulic pump to the traveling control valve is controlled by an electromagnetic valve or the like. In some cases, the operation of the traveling lever cannot be performed by shutting off (hereinafter, referred to as a conventional device 3).

[0011]

The conventional devices 1 to 3 are traveling lever lock devices in which only one gate lock lever is provided. Therefore, although the configuration when two gate lock levers are provided on both the left and right sides is unknown, it is conceivable to provide two identical devices. However, in the conventional device 1, the member 15 provided at the lower part of the traveling lever 11 is inserted into the earth-shaped slot provided in the plate 17, and the plate 17 is moved at right angles to the moving direction of the traveling lever. Locking and unlocking of the travel lever 11 is performed by restricting or freely moving the member 15, and the mechanism is complicated. Further, if two gate lock levers are used, the mechanism becomes more complicated and a problem arises.
In addition, since the lock device is provided below the floor of the upper revolving structure, there is also a problem that it is difficult to check for a failure or the like.

Further, in the conventional device 2, the lower plate 32 is fixed to the lower portion of the traveling lever 11, and is provided on the engagement portion 33 provided on the lower surface of the lower plate 32 and the drive shaft 35 of the reduction motor 34. The traveling lever is locked by engaging with the engaging projection 37 of the link 36. However, when two gate lock levers are provided, it is unclear how to configure the gate, and difficult problems are expected. Is done. Conventional device 3
Is considered to have poor reliability in the event of failure in machines that include electrical systems and cannot avoid large forces and vibrations, such as hydraulic excavators. There is a problem in that it becomes expensive.

The present invention has been made under the above-mentioned background, and when a gate lock lever is provided on each of the left and right sides of a driver's seat, the gate lock device has a simple structure, is compact, and has few failures. It is another object of the present invention to provide a simple gate lock device even when the device is added later.

[0014]

The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
According to the invention described above, in a construction machine capable of getting on and off from both left and right sides, gate lock levers for opening and closing the left and right passages for getting on and off are provided on both left and right sides of a seat, and a traveling lever for running the construction machine is erroneously provided. A lock device for preventing operation is provided, the gate lock lever and the lock device are mechanically connected, and the traveling lever is locked when one or both of the left and right gate lock levers are operated to the lock side. It is characterized by having been provided so that.

According to a second aspect of the present invention, in the first aspect, a first member and a second member each having a notch are fixed to the traveling lever, and a lock member is engaged with each of the notches. A spring means is provided so as to be engaged and disengaged and holds the lock member in an engaged state, and each of the gate lock levers is connected to the lock member by a pull cable to move the gate lock lever to the unlock side. It is characterized in that the lock member is disengaged from the notch when operated.

According to a third aspect of the present invention, in the second aspect of the present invention, a first member and a second member are integrally formed so that the notch is located at both ends, and the first member and the second member are formed on a pivot portion of the traveling lever. A lock pin fixed to the notch and rotatably provided at a position opposite to the pivot about the pivot is provided, and the lock pin is held in an engaged state by applying a biasing force by a torsion coil spring. Further, when the gate lock lever is operated to the unlock side, a pulling force is generated in the pull cable, so that the lock pin is disengaged.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the lock device has a member having a notch portion fixed to the traveling lever, and a lock member is engaged and engaged with the notch portion. A spring means for detachably providing the lock member in an engaged and disengaged state is provided, the output side of the pull adder is connected to the lock member, and the tension is increased when each of the gate lock levers is operated to the lock side. One end of the pull cable is connected so as to generate, and the other end of the pull cable is connected to the input side of the pull adder, and when one or both of the gate lock levers are operated to the lock side, the pull addition is performed. A tension is generated on the output side of the container, and the lock member is engaged with the cutout portion against the spring force.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the lock device has a member having a notch portion fixed to the traveling lever, and a lock member is engaged with and engaged with the notch portion. A spring means for detachably providing the lock member in an engaged state, connecting an output side of a pull multiplier to the lock member, and applying a tension when each of the gate lock levers is operated to the unlock side. When one end of the pull cable is connected to the input side of the pull multiplier and one or both of the gate lock levers are operated to the lock side so that a pull cable is connected, The output side of the pull multiplier is relaxed, and the lock member is engaged with the notch by the spring force.

The invention according to claim 6 is the invention according to claims 1 to 5
In the invention described in (1), the lock device is characterized in that the travel lever is directly connected to a control end of a travel control valve by a connecting member.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is an overall side view showing the structure of a first embodiment of the present invention, and FIG. 2 is a perspective view of a traveling lever lock device of the first embodiment. Actually, as shown in FIG.
Although two traveling levers 51L and 51R are provided,
Since the left and right traveling levers 51L and 51R have the same configuration, only one traveling lever 51L (hereinafter simply referred to as the traveling lever 51) will be described. In FIG. 1, a pivot 52 is fixed below the traveling lever 51,
2 is rotatably supported by a bearing (not shown). A first member 5 having notches 53a at both ends of the pivot 52;
3. The second member 54 having the notch 54a is fixedly provided. The lower end of the traveling lever is connected to a spool of the traveling control valve 50 via a connecting member 49. Note that the first member 53 and the second member 54 may be formed integrally.

The lock pin 5 is inserted into the notches 53a and 54a.
5, 56 are rotatably provided at positions where they can be engaged and disengaged. The rotation supporting portions of the lock pins 55 and 56 are provided with torsion coil springs 57 and 58, respectively.
5 and 56 are urged to engage with the notches 53a and 54a. The lock members 55 and 56 have rod members 5.
9 and 60 are fixedly provided. One ends of pull cables 61 and 62 are connected to the free ends of the rod members 59 and 60, respectively.

On the other hand, gate lock levers 70, 71 are provided on the left and right outer sides of the console boxes 68, 69, respectively. The gate lock levers 70 and 71 are levers for the operator to lock the traveling lever when getting off the vehicle, and are provided in the operator's getting on / off passage. The solid line in the figure shows the unlocked state (passage closed) of the gate lock levers 70 and 71, and the dotted line shows the locked state (passage open). As shown in FIG. 3, the gate lock lever 70 is rotatably provided on a bracket 73 by a rotation shaft 79 and a bearing 72. The bracket 73 is provided on a side surface of the console box 74, for example. The solid line in the figure is the gate lock lever 7
Numerals 0 and 71 indicate the unlocked state (passage closed), and the dotted line in the figure indicates the locked state (passage open). FIG. 3 shows a detailed configuration of the rotation support portion of the gate lock lever 70. The gate lock lever 71 has the same configuration as the gate lock lever 70.

FIG. 3 shows the detailed structure of the rotation supporting portion of one gate lock lever 70,
Is mounted on a bracket 73 so as to be rotatable by a rotating shaft 79 and a bearing 72, and the bracket 73 is provided on a side surface of the console box 74. A member 75 is fixed to the rotating shaft 79, a locking portion 76 of a spring 77 is provided on the member 75, and another locking portion 78 is provided on the bracket 73. The spring 77 is attached to the locking portions 76 and 78 in a pulled state, and has the shortest length in the locked state and the unlocked state of the gate lock lever 70, and is in a stable state. One end of the pull cable 61 is connected to the member 75. The pull cable 61 is connected so as to be pulled in an unlocked state (solid line in the figure). In addition,
The gate lock lever 71 has the same configuration as the gate lock lever 70.

The first embodiment is configured as described above, and functions as follows. That is, the gate lock lever 70,
When both 71 are in the unlocked state (solid line in the figure), the pull cables 61 and 62 are pulled, and the lock pins 55 and 56 are in the disengaged state. Therefore, in this case, the traveling lever 51 (actually, both 51L and 51R) is in an unlocked state and can travel. Gate lock lever 70 (or 71, hereinafter the same) is locked (dotted line in the figure)
, The pull cable 61 (62) is loose and no tensile force is generated, so the torsion coil spring 57 (5)
The lock pin 55 (56) is notched 5 by the urging force of 8).
3a (54a), and the travel lever 51 (actually, 5
1L and 51R) are locked. Therefore, when one or both of the gate lock levers 70 and 71 are operated to the lock side, the travel lever 51 becomes inoperable.

As can be seen from the configuration described above, the first embodiment employs a lock mechanism capable of engaging or disengaging a lock pin with a notch, and connecting the lock mechanism and the gate lock device with a pull cable. Therefore, the configuration is simple, and the traveling lever is directly connected to the spool of the traveling control valve. Therefore, the first embodiment has the effect of being compact and having few failures.

<Embodiment 2> FIG. 4 is a diagram showing the configuration of Embodiment 2. In FIG. 4, the same components as those in the first embodiment (FIG. 1) are denoted by the same reference numerals, and detailed description is omitted. In the second embodiment, a first member 53 fixed to the traveling lever 51 and a lock device (lock pin 55
Etc.) is omitted. Hereinafter, the second embodiment will be described focusing on the differences.

Unlike the first embodiment, the torsion coil spring 80 is biased in a direction (counterclockwise in the drawing) in which the lock pin 56 is disengaged from the notch 54a. One ends of the pull cables 81 and 82 are connected to gate lock levers 70 and 71, respectively.
Unlike the first embodiment, the pull cable 81 (82) is tensioned when the gate lock lever 70 (71) is locked, and relaxed when the gate lock lever 70 (71) is unlocked. To connect. Opposite ends of the pull cables 81 and 82 are connected to an input side of a pull adder 83. The output side of the pull adder 83 is connected to the tip of the rod member 60 of the lock pin 56 via a pull cable 84.

FIG. 5 shows an example of the configuration of the pull adder 83. When the tension P1 acts on the pull cable 81 and the tension P2 acts on the pull cable 82, the pull adder 83 applies the logical sum P3 (= P1 + P) of the tensions P1 and P2 to the output pull cable 84.
This is a device in which 2) is generated as tension. 5 includes a case 87, a slider 88 slidably provided inside the case 87, and a pull cable slidably inserted into holes 88a, 88a provided in the slider 88. 81, 82, stoppers 89, 89 connected to the ends of the pull cables 81, 82, and tension springs 8
6, output cable 8 connected to 86 and slider 88
And 4. As is apparent from the above configuration, when a pulling force acts on the pull cable 81 or 82 or both, a pulling force is generated on the pull cable 84.

Embodiment 2 functions as follows with the above configuration. That is, the gate lock lever 70 (or 71)
Is set to the locked state (the position indicated by the dotted line in the figure), the pull cable 81 (or 82) is pulled, and tension is generated. In a state where one or both of the pull cables 81 and 82 are pulled, the pull cable 84 is also pulled and the rod member 60 is also pulled rightward in the drawing, so that the lock pin 56 is notched against the spring force of the torsion coil spring 80. The traveling lever 51 is locked by engaging with the lever 54a. When both the gate lock levers 70 and 71 are unlocked (the positions indicated by the solid lines in the figure), both the pull cables 81 and 82 are relaxed, and the pull cable 84 is also relaxed. The lock pin 56 is a torsion coil spring 80
The traveling lever 51 is disengaged from the notch 54a by the spring force of
Is unlocked.

In the second embodiment, the pull cables 81 and 82 need only be connected to the input side of the pull adder 83, and the pull cable 84 on the output side need only be connected to the bar member 60 constituting the lock device. The first member 53 fixed to the traveling lever 51 and the lock device (the lock pin 55 and the like) associated therewith are not required, and the pull cable can be shorter than in the first embodiment. Therefore, the second embodiment has the effect of being more compact and having fewer failures than the first embodiment. Further, even when the number of lock levers is increased to two just by connecting the pull cable and using the pull adder. Since it can be used, an effect is obtained that it can be easily added to an existing device.

<Third Embodiment> FIG. 6 shows the configuration of the third embodiment. 6, the same components as those in the first embodiment (FIG. 1) are denoted by the same reference numerals, and detailed description is omitted. Embodiment 3 is characterized in that the second member 54 fixed to the traveling lever 51 and the lock device (lock pin 56 and the like) related thereto are omitted. Hereinafter, the third embodiment will be described focusing on the differences. In the third embodiment, a pull cable 61,
The traveling lever 51 side is connected to the input end of a pull multiplier 91, and the output end is connected to the member 59 of the lock pin 55 via a pull cable 92.

FIG. 7 shows an example of the configuration of the pull multiplier 91. In FIG. 7, a connecting member 94 is provided inside a case 93. Pull cables 61 and 62 are connected to both ends of the connecting member 94 by pins or the like. A guide hole 95 is provided substantially at both ends of the connecting member 94, and a movable roller 96 is fitted into the guide hole 95. The roller 96 is connected to one end of a member 97 by a pin or the like, and the other end of the member 97 is connected to a pull cable 92. The other end of the pull cable 92 is connected to the member 59 and is pulled by the torsion coil spring 57 to the left in the drawing. That is, the pull multiplier 91 is configured so that the logical product of the tensions of the pull cables 61 and 62 is generated in the pull cable 92.

Embodiment 3 functions as follows with the above configuration. That is, when the gate lock levers 70 and 71 are in the unlocked state, the pull cables 61 and 62
Are in tension. Accordingly, as shown in FIG. 7, the pull cable 92 is pulled rightward, the lock pin 55 is in a state of being disengaged from the notch 53a, and the traveling lever 51 is in an unlocked state.

When one of the gate lock levers, for example, the gate lock lever 70 is in a locked state and the other gate lock lever 71 is in an unlocked state, the pull cable 61 is in a relaxed state and the pull cable 62 is in a pulled state. It is in. The lower part of the connecting member 94 moves rightward, but the upper part remains as it is. Therefore, the roller 96 moves upward, and no tension is generated in the pull cable 92 in the right direction, so that the pull cable 92 is in a relaxed state. Since the lock pin 55 is urged clockwise by the torsion coil spring 57, the notch 53
a and the traveling lever 51 is locked.

When the gate lock lever 71 is in the locked state and the other gate lock lever 70 is in the unlocked state, the same function is performed. When both of the gate lock levers 70 and 71 are locked, the pull cables 60 and 61 are both in a relaxed state, the pull cable 92 is also in a relaxed state, and the traveling lever 51 is in a locked state. The third embodiment has the configuration and functions described above, and has the same effects as the second embodiment.

The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and changes in design and the like may be made without departing from the gist of the present invention. Even if there is, it is included in the present invention. For example, the spring means is not limited to a torsion coil spring, and other springs may be used.

[0037]

As described above, according to the first to third aspects of the present invention, a lock mechanism is formed by engaging or disengaging a lock member in a notch, and a lock mechanism is formed by a pull cable. Since the configuration in which the mechanism and the gate lock device are connected to each other is adopted, it is possible to obtain an effect that the configuration is simple, the number of failures is small, and the repair is easy. Further, according to the configurations of the fourth and fifth aspects of the invention, it is possible to obtain an effect that it can be easily added to an existing device.

[Brief description of the drawings]

FIG. 1 shows an overall configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view of the traveling lever lock device according to the first embodiment of the present invention.

FIG. 3 illustrates a gate lock lever flip-up device according to the first embodiment.

FIG. 4 shows an overall configuration of a second embodiment of the present invention.

FIG. 5 shows a configuration example of a pull adder.

FIG. 6 shows an overall configuration of a third embodiment of the present invention.

FIG. 7 shows a configuration example of a pull multiplier.

FIG. 8 shows an overall configuration of a conventional apparatus 1.

FIG. 9 shows details of a lock unit of the conventional device.

FIG. 10 shows a configuration of a conventional device 2.

[Explanation of symbols]

 Reference Signs List 50 traveling control valve 51 traveling lever 53, 54 member having notch (first and second members) 53a, 54a notch 55, 56 lock pin (lock member) 57, 58 biasing spring (spring means) 61 , 62 Pull cable 70, 71 Gate lock lever 81, 82 Pull cable 83 Pull adder 91 Pull multiplier

Claims (6)

[Claims] In a construction machine capable of getting on and off from both right and left sides, gate lock levers for opening and closing a left and right passage for getting on and off are provided on both left and right sides of a seat, and a traveling lever for running the construction machine is erroneously provided. A lock device for preventing operation is provided, the gate lock lever and the lock device are mechanically connected, and the traveling lever is locked when one or both of the left and right gate lock levers are operated to the lock side. A travel lever lock device for a construction machine, wherein 2. A first member and a second member each having a cutout portion are fixed to the traveling lever, and a lock member is provided in each of the cutout portions so as to be engageable and disengageable, and the lock member is in an engaged state. The lock member is disengaged from the notch when the gate lock lever is connected to the lock member by a pull cable and the gate lock lever is operated to the unlock side. The travel lever lock device for a construction machine according to claim 1, wherein 3. A first member and a second member are integrally formed so that the notch is located at both ends, and the first member and the second member are integrally fixed to a pivot portion of the traveling lever, and a lock pin engaged with the notch is provided. The lock pin is provided rotatably at an opposite position about the pivot portion, and the lock pin applies an urging force by a torsion coil spring to hold the engagement state, and when the gate lock lever is operated to the unlock side. The travel lever lock device for a construction machine according to claim 2, wherein a pulling force is generated in the pull cable, and the lock pin is configured to be engaged and disengaged. 4. The lock device has a member having a notch portion fixed to the travel lever, a lock member is provided in the notch portion so as to be engageable and disengageable, and the lock member is held in an unlocked state. A spring means is provided, the output side of the pull adder is connected to the lock member, and one end of the pull cable is connected so that tension is generated when each of the gate lock levers is operated to the lock side. When the other end is connected to the input side of the pull adder and one or both of the gate lock levers are operated to the lock side, tension is generated at the output side of the pull adder, and the lock member is connected to the spring. The traveling lever lock device for a construction machine according to claim 1, wherein the notch is engaged with the notch against a force. 5. The lock device according to claim 1, wherein a member having a notch is fixed to the travel lever, a lock member is provided in the notch so as to be engageable and disengageable, and the lock member is held in an engaged state. A spring means, an output side of a pull multiplier is connected to the lock member, and one end of a pull cable is connected so that tension is generated when each of the gate lock levers is operated to an unlock side; The other end of the pull multiplier is connected to the input side of the pull multiplier, and when one or both of the gate lock levers are operated to the lock side, the output side of the pull multiplier relaxes, and the locking member releases the spring force. The travel lever lock device for a construction machine according to claim 1, wherein the notch is engaged with the notch. 6. The lock device according to claim 1, wherein the travel lever is connected directly to a control end of the travel control valve by a connecting member. Travel lever lock device for construction machinery.