JPH0899794A - Accelerator operating mechanism of crane - Google Patents

Abstract

PURPOSE: To reduce the operating force in the accelerator control operation by a crane operating lever, and to improve the operating feeling. CONSTITUTION: In a crane in which crain operating levers 8 are provided on the left side and the right side bases 2 of a crane main body 1, lever links 3 to which both side crane operating levers 8 are installed are combined by a connecting rod 10, and the crane operation can be carried out either from the left side or from the right side, vertical shafts 12L and 12R are pivoted on the crane bases 2, and a pair of gears 13L and 13R, and a pair of roller links 14L and 14R, rotating by gearing each other, are provided. At the tips of the roller links 14L and 14R, rollers 15L and 15R are pivoted, engaging members 18L and 18R engaged with the rollers 15L and 15R are provided to the connecting rod 10 at a specific interval, an accelerator operating lever 20 is provided to the vertical shaft 12L, and an accelerator cable 21 is connected to the tip of the lever 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator operating mechanism of a crane mounted on a vehicle such as a truck, and more particularly to an accelerator operating mechanism of a crane constructed so that not only the accelerator operating lever but also the crane operating lever can operate the accelerator. Regarding the mechanism.

[0002]

2. Description of the Related Art Generally, in a crane mounted on a vehicle such as a truck, crane operating levers for performing crane operations such as swinging and hoisting and retracting a boom and hoisting and lowering a winch are provided on both left and right sides of the crane body. The crane operating lever is connected by a connecting rod so that the crane can be operated from either side of the vehicle. Further, the operating speed of the crane is configured such that the accelerator of the engine, which is the power source, is controlled by the accelerator operating lever.

However, a plurality of crane operation levers are used to selectively switch crane operations such as boom hoisting and hoisting, winch hoisting and hoisting, and controlling the operating speed.
It is difficult to operate because it is necessary to operate the accelerator operation lever. Therefore, the accelerator operation mechanism of the crane that can also control the accelerator with the crane operation lever
2-168089) has been proposed. In this crane operating mechanism, as shown in FIG. 8, the pivoting fulcrums A and B of the crane operating levers 8 on both sides, the lever link 3 to which the left and right crane operating levers 8 are attached, and the connecting rod 1 are provided.
The connecting pivot points C and D with respect to 0 are arranged on the same plane as the vertices of the parallelogram, and when the lever link 3 is rotated by the rotation operation of the crane operation lever 8, the connection rod 10 is Since it moves to the left and right and also moves back and forth in a parallel state, the roller 26 is pushed by this shift of the connecting rod 10 back and forth to rotate the accelerator operating lever 20 and pull the accelerator cable 21 to control the accelerator. Has been done.

[0004]

However, in the above configuration, compared with the amount of movement of the connecting rod 10 to the left and right,
The amount of displacement of the connecting rod 10 back and forth is extremely small. In order to obtain a necessary operation amount for the accelerator cable 21 with this small displacement amount, the accelerator operation is performed with respect to the distance from the contact point 30 of the roller 26 with the connecting rod 10 to the pivot point 27 of the accelerator operation lever 20. Pivot 2 of lever 20
The distance from 7 to the attachment point 31 of the accelerator cable 21 must be very large. Therefore, the efficiency of transmitting the operating force of the crane operating lever 8 to the accelerator cable 21 is deteriorated, and a large operating force is required when operating the crane operating lever 8, so that the lever link 3 and the connecting rod 10 are largely bent. There is a problem that the operation feeling is poor and it becomes difficult to perform delicate control operations.

The present invention solves the above problems in the accelerator operation mechanism of the crane, and enables the accelerator control by the crane operation lever, and the operation of the crane operation lever during the accelerator control operation by the crane operation lever. It is an object of the present invention to provide an accelerator operating mechanism for a crane that can reduce the force and improve the operation feeling.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a crane operating lever is provided on each of the left and right bases of a crane body, and lever links for mounting the crane operating levers on both sides are connected by a connecting rod. In a crane configured to be able to operate the crane also, a pair of vertical axes is pivotally supported on the crane base, and on this vertical axis, a pair of gears that mesh with each other and rotate, and a roller link are fixed, Each roller is pivoted at the tip of the roller link,
Engagement members that engage with this roller are provided at predetermined intervals on the connecting rod, and an accelerator operating lever is fixedly provided on one vertical axis,
The accelerator operation mechanism of the crane is configured by connecting an accelerator cable for operating the accelerator of the engine to the tip of the accelerator operation lever to solve the above problem.

[0007]

In operation of the crane, the operator turns the crane operation lever back and forth to switch the control valve of the crane, and performs the operation of the crane such as boom swelling and retracting, boom and winch hoisting and lowering. When the crane operation lever is further rotated from the control valve switching position, the left and right movements of the connecting rod cause the engaging member to push the roller to rotate the roller link and the gear. Pull the accelerator cable to accelerate the engine.

When the operator releases the crane operation lever, the accelerator cable returns to its original position by the spring provided on the accelerator lever on the engine side.
The crane operating lever returns to the neutral position by the force of the return spring of the switching spool inside the control valve.

[0009]

1 is a plan view of an accelerator operating mechanism of a crane according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIGS. 3 to 7 are explanatory views of the operation of the accelerator operating mechanism of a crane. In this embodiment, the basic structure of the crane operating mechanism is the same as that of the conventional crane operating mechanism. On a base 2 of a crane main body 1 mounted on a vehicle, there are provided a turning column, a boom that can be extended and retracted, and a winch (not shown). A control valve 7 is installed on the right side of the base 2 in the vehicle width direction, and a spool of the control valve 7 is connected to one end of a lever link 3 that is pivotally supported about a pivot shaft 9. Link 3
A crane operating lever 8 is attached to the. In this embodiment, there are four crane operating levers 8 and
A book outrigger operating lever 4 and a single accelerator operating lever 11 are provided.

A lever stand 5 is provided on the left side of the base 2.
And a flat plate bracket 6 is fixedly mounted on the lever stand 5. A pivot shaft 9 is attached to the left end of the flat plate bracket 6, and a lever link 3 is pivotally supported on the pivot shaft 9, and a crane operation lever 8 is attached to the lever link 3. There is. There are four crane operating levers 8 as on the right side, and 2
A book outrigger operating lever 4 and a single accelerator operating lever 11 are provided.

The lever links 3 to which the crane operating levers 8, the outrigger operating levers 4, and the accelerator operating levers 11 on both sides are attached are all connected left and right by a connecting rod 10, and the crane can be operated from either side of the vehicle. You can do it. A pair of vertical axes 12L and 12R are rotatably supported on the right portion of the flat plate bracket 6,
A pair of fan-shaped gears 13L, 13R which mesh with each other and rotate are fixedly provided at appropriate positions on the vertical axes 12L, 12R. Further, roller links 14L and 14R are fixedly provided on the upper and lower ends of the vertical axes 12L and 12R toward the connecting rod 10 side, and rollers 15L and 15R are pivotally supported by pins 16 at the tips of the roller links, respectively. Has been done.

On the connecting rod 10 for connecting the left and right outrigger operating levers 4 and the accelerator operating lever 11, respectively, engaging members 17L and 17R are fixed at positions which substantially abut the outer sides of the left and right rollers 15L and 15R in a neutral state. The connecting rod 10 that connects the left and right crane operating levers 8 is provided with an engaging member 18L that is slightly wider than the engaging members 17L and 17R that are provided on the connecting rod 10 that connects the accelerator operating lever 11. 18R is fixed.

An accelerator operating lever 20 is fixedly mounted on the left vertical axis 12L, and one end of an accelerator cable 21 is connected to the tip of the accelerator operating lever 20. The other end of the accelerator cable 21 is connected to the vehicle engine 2
It is connected to the second accelerator lever 23. The lever stand 5 is provided with a stopper 24 that restricts the maximum counterclockwise rotation amount of the accelerator operating lever 20.

During crane work, the operator turns the crane control lever 8 from the neutral position shown in FIG. 5 to the front and back to switch the control valve 7 of the crane.
Performs crane operations such as boom swing undulations, winch hoisting and hoisting. Now, when one operation lever 8 is rotated clockwise to the position shown in FIG. 4, this position is the switching position of the control valve 7, and the crane operates in this state. At this time, the connecting rod 10 moves to the left and the engaging member 18R approaches the roller 15R and is in a contact state.

When the operation lever 8 is further rotated clockwise from this state to the position shown in FIG. 3, the engaging member 18R engages with the roller 15R by the movement of the connecting rod 10 to the left, and the roller 15R is moved to the left. Roller link 14
The R and the gear 13R are rotated clockwise. Then, the gear 13L meshing with the gear 13R rotates counterclockwise, so that the accelerator operating lever 20 rotates counterclockwise to pull the accelerator cable 21 and the accelerator lever 23 operates to accelerate the engine 22. .

When the operator releases the crane operating lever 8 at the position shown in FIG. 3, the accelerator cable 21 is returned to its original position by the spring provided on the accelerator lever 23 on the engine 22 side. The force of the return spring of the switching spool inside the control valve 7 returns the neutral position of FIG. When the crane operating lever 8 is rotated counterclockwise to the position shown in FIG. 6, this position is the switching position of the control valve 7, and the crane operates in this state. At this time, the connecting rod 10 moves right and the engaging member 18L moves to the roller 15L.
And are in contact with each other.

When the crane operating lever 8 is further rotated counterclockwise from this state to the position shown in FIG. 7, the engaging member 18L moves the roller 1 by the movement of the connecting rod 10 to the right.
5L is engaged and pushes the roller 15L to the right to rotate the roller link 14L and the gear 13L counterclockwise. Then, the accelerator operating lever 20 rotates counterclockwise, pulls the accelerator cable 21, and the accelerator lever 23 operates to accelerate the engine 22.

Engaging members 17L and 17R are fixed to the connecting rod 10 connecting the left and right outrigger operating levers 4 and the accelerator operating levers 11 at positions where they are substantially in contact with the outer sides of the left and right rollers 15L and 15R in a neutral state. Outrigger operating lever 4 or accelerator operating lever 1
As soon as 1 is rotated, either the left or right roller 15L,
15R is pushed and the accelerator operating lever 20 is rotated counterclockwise to pull the accelerator cable 21.
Accelerate 2. When the outrigger operation lever 4 is operated, the engine 22 is accelerated at the same time when the control valve 7 is switched, but this is due to a delicate inching operation such as when operating the crane operation lever 8 when operating the outrigger. This is because it is not necessary and is designed to operate quickly.

As described above, the connecting rod 1 having a large movement amount
Since the movement of 0 to the left and right is transmitted to the accelerator cable 15, the efficiency of transmitting the operating force of the crane operating lever 8 to the accelerator cable 15 is good, and a large operating force is not required when operating the crane operating lever 8. Lever link 3
Also, the bending of the connecting rod 10 is small, and the operation feeling can be improved.

[0020]

As described above, the accelerator operating mechanism of the crane according to the present invention is capable of accelerator control by the crane operating lever, and the operating force of the crane operating lever is controlled when the accelerator is operated by the crane operating lever. It is possible to reduce the operation feeling, improve the operation feeling, and perform delicate control operations.

[Brief description of drawings]

FIG. 1 is a plan view of an accelerator operating mechanism of a crane that is an embodiment of the present invention.

FIG. 2 is a front view of an accelerator operating mechanism of a crane.

FIG. 3 is an explanatory diagram of an operation of an accelerator operating mechanism of a crane.

FIG. 4 is an explanatory diagram of an operation of an accelerator operating mechanism of a crane.

FIG. 5 is an explanatory diagram of the operation of the accelerator operation mechanism of the crane.

FIG. 6 is an explanatory diagram of the operation of the accelerator operation mechanism of the crane.

FIG. 7 is an explanatory diagram of the operation of the accelerator operation mechanism of the crane.

FIG. 8 is a plan view of a conventional accelerator operating mechanism.

[Explanation of symbols]

 1 Crane Main Body 2 Base 3 Lever Link 4 Outrigger Operating Lever 5 Lever Stand 6 Flat Bracket 7 Control Valve 8 Crane Operating Lever 9 Pivot Shaft 10 Connecting Rod 11 Accelerator Operating Lever 12L, 12R Vertical Axis 13L, 13R Gear 14L, 14R Roller Link 15L, 15R Roller 16 pin 17L, 17R Engagement member 18L, 18R Engagement member 20 Accelerator operating lever 21 Accelerator cable 22 Engine 23 Accelerator lever

Claims (1)

[Claims] 1. Crane operation levers are provided on both left and right sides of a crane main body, and lever links to which the crane operation levers on both sides are attached are connected by connecting rods so that the crane can be operated from either the left or right side of the vehicle. In a crane, a pair of vertical axes is pivotally supported on a crane base, and on the vertical axis, a pair of gears that mesh with each other and rotate, and a roller link are fixedly provided, and a roller is provided at each tip of the roller link. An accelerator cable that pivotally supports and engages with the roller at predetermined intervals on the connecting rod, has an accelerator operating lever fixedly provided on one longitudinal axis, and operates the accelerator of the engine on the accelerator operating lever. An accelerator operating mechanism for a crane, which is characterized in that