JPH0616390A - Preventing device for overturn of crane-loading vehicle - Google Patents

Abstract

PURPOSE:To prevent overturn in the case of on-vehicle type crane loading vehicle, by detecting the tilt of the vehicle body, for prohibiting crane from making its up motion. CONSTITUTION:A guard frame 7 is provided in front of a load-carrying platform 2, and a crane arm 5 is engagingly locked by a locking hook 8 provided thereon and stoved in its place. Also, a body tilt sensor 11 is provided on the guard frame 7. In this tilt sensor 11, a pendulum 14 is swingably suspended by being fastened with a bolt 13. And a switching lever 21 operated by the oscillation of this pendulum 14 and a limit switch 20 turned on and off by the switching lever 21 are provided. Accordingly, the pendulum 14 is oscillated by the tilt of a vehicle 1, and the lift switch 20 is turned off through the switching lever 21 in a tilt more than the set value. Then, the up-motion of the crane is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle overturn prevention device having a vehicle-mounted crane mounted on a loading platform.

[0002]

2. Description of the Related Art Generally, in the delivery of electric appliances and the transportation of agricultural products, these products are carried on a bed of a small truck (light truck). However, the present situation is that most of the work of loading or unloading these loads on the bed of a truck depends on manpower. It is possible to use a crane for the above-mentioned loading and unloading work of luggage,
It is not possible to use large cranes such as those used at construction sites. Therefore, a small crane that can be mounted on a truck bed is being developed.

[0003]

By the way, when a vehicle-mounted crane is mounted on such a loading platform, the vehicle may fall if the luggage is attempted to be lifted while the vehicle body is tilted.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a tilt detecting means for detecting a tilt of a vehicle body, a means for prohibiting an up operation of a crane according to a detection result of the tilt detecting means, and an up operation. Means for prohibiting both movement and down movement, means for forcibly moving down the crane, or means for warning were provided.

[0005]

The crane arm is detected by detecting the inclination of the vehicle and prohibiting the up movement of the crane arm, prohibiting both up and down movement, forcibly moving down, or issuing a warning according to the detection result. It is possible to prevent the vehicle from falling due to the rise of the vehicle.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a rear view of a vehicle equipped with an in-vehicle crane to which the fall prevention device according to the present invention is applied, and FIGS.
Is a front view, rear view, front sectional view and side sectional view of the tilt sensor of the same fall prevention device, FIG. 6 is a side sectional view of the same tilt sensor when the crane arm is housed, and FIGS. It is a different circuit diagram.

A vehicle-mounted crane 3 is mounted on the loading platform 2 of the vehicle 1. The vehicle-mounted crane 3 includes a support column 4 rotatably supported on the platform 2, a crane arm 5 supported on the upper end of the support column 4 so as to be swingable, and between the support column 4 and the crane arm 5. Is composed of an intervening power unit 6 and the like.

The crane arm 5 is locked by a locking hook 8 provided on a torii 7 provided in front of the loading platform 2 for storage. The power unit 6 also includes a motor, a hydraulic pump driven by the motor, a cylinder unit to which hydraulic oil is supplied and discharged, a sub-tank for compensating the piston rod of the cylinder unit to move in and out, and a valve mechanism for switching the flow path of hydraulic oil. It becomes one. .

An inclination sensor 11 for detecting the inclination of the vehicle body is attached to the torii 7. This tilt sensor 11
2 to 6, a bolt 13 serving as a support shaft is fixed in the housing 12, and the pendulum 1 is attached to the bolt 13.
4 is swingably suspended. This pendulum 14 is a spindle 1
3, a roller 15 is attached to the lower end of the pendulum 14 by a bolt 16, and the bolt 16 is projected to the outside through a peephole 17 formed in the housing 12, and an intermediate portion of the bolt 16 is provided. A nut 18 is screwed on.

The pendulum 14 is provided in the housing 12.
Has a limit switch 20 which is turned on / off by pushing a switching lever 21. The bolt 23 of the two fixing bolts 22 and 23 for fixing the limit switch 20 to the housing 12 is inserted into the groove 24 formed in the housing 12, and the tilt of the limit switch 20 is adjusted with the bolt 22 as a fulcrum. It is possible. Further, a stopper 25 for stopping the pendulum 14 is attached to the lower portion of the limit switch 20.

In the tilt sensor 11, the pendulum 14 swings as the vehicle body leans to the left as shown in FIG. 1, and when the vehicle body leans more than a set value, the pendulum 14 is the switching lever 21 of the limit switch 20. Press to activate the limit switch 20. Here, the limit switch 20
By adjusting the inclination of itself, the set value of the detected inclination can be changed.

Further, in the tilt sensor 11, when the crane arm 5 is housed along the torii 7 as shown in FIG. 6, the end of the bolt 16 contacts the rubber 5a attached to the crane arm 5. Since the nut 18 is pressed against the outer surface of the housing 12 and pushed inward, the pendulum 14 is fixed and the detection operation is prohibited. This allows
The durability of the tilt sensor 11 is improved.

Next, a circuit for controlling the movement of the crane arm according to the detection result of the tilt sensor 11 will be described. FIG. 7 is a circuit for prohibiting the up movement of the crane arm 5 when the inclination of the vehicle body exceeds a set value. From the battery 31, the rotation direction switching relay 32 is connected to the motor 33 of the power unit 6 via each contact. In addition to supplying power, power is supplied to the relay coil 32u of the relay 32U via the series circuit of the up switch 34 and the limit switch 20 of the tilt sensor 11 (turned off in the operating state), and the relay of the relay 32D via the down switch 35. Power is supplied to the coil 32d.

In this circuit, the up switch 34
While the is pressed, the relay coil 32u is supplied with power and the relay 32U switches from the normally closed contact b side to the contact a side.
The motor 33 rotates in the forward direction and the crane arm 5 rises (up operation). Further, while the down switch 35 is being pressed, power is supplied to the relay coil 32d and the relay 32D is switched from the normally closed contact b side to the contact a side. Therefore, the motor 33 reversely rotates and the crane arm 5 descends (down operation). .

Here, when the inclination of the vehicle body exceeds the set value, the pendulum 14 of the inclination sensor 11 is moved to the limit switch 2
Since the switching lever 21 of 0 is pushed, the limit switch 20 is turned off, and the power feeding path to the relay coil 32u of the relay 32U is cut off.
The crane arm 5 will not rise even if 4 is pressed.

Further, FIG. 8 shows a circuit for prohibiting the operation of the crane arm 5 when the inclination of the vehicle body exceeds a set value. The limit switch 20 of the inclination sensor 11 is shown in FIG.
(It is turned off in the operating state) is interposed between the battery 31 and the parallel circuit of the relay coils 32u and 32d of the rotation direction switching relay 32.

Therefore, when the inclination of the vehicle body exceeds the set value, the pendulum 14 of the inclination sensor 11 pushes the switching lever 21 of the limit switch 20, so that the limit switch 20 is turned off, and the relay coil 32u of the relay 32U and the relay 32U. Since the power feeding paths to the relay coil 32d of 32D are both cut off, the up switch 34
The crane arm 5 does not move regardless of which of the down switch 35 and the down switch 35 is pressed. For example, when the luggage is unloaded from the vehicle body while the vehicle body is tilted, the arm 5 is swung in the direction a as shown in FIG. When the vehicle body is in the horizontal state, the largest moment acts on the vehicle body. Therefore, when the vehicle body is tilted more than a predetermined value, the above operation is stopped.

Further, FIG. 9 shows a circuit in which a warning lamp is turned on when the inclination of the vehicle body exceeds a set value.
Power is supplied to the warning lamp 36 via the limit switch 20 of the tilt sensor 11 (which is turned on in the operating state). Therefore, when the tilt of the vehicle body exceeds the set value, the tilt sensor 11
The pendulum 14 pushes the switching lever 21 of the limit switch 20, so that the limit switch 20 is turned on and the warning lamp 36 is turned on. The warning display is not limited to the warning lamp, and a warning buzzer may sound.

Further, the crane arm can be forcibly moved down when the inclination of the vehicle body exceeds a set value. In this case, when the tilt of the vehicle body becomes smaller than the set value due to the down operation of the crane arm and the tilt sensor is in the off state, the down operation is stopped, so that the down operation is continued for a certain time by a timer or the like. It is good to do so.

[0020]

As described above, according to the present invention,
The vehicle tilt is detected, and depending on the detection result, the crane arm up movement is prohibited, both up and down movement is prohibited, forced down movement is performed, or a warning is issued. It is possible to prevent the crane arm from rising and the vehicle toppling over when tilted.

[Brief description of drawings]

FIG. 1 is a rear view of a vehicle equipped with an on-vehicle crane to which a fall prevention device according to the present invention is applied.

FIG. 2 is a front view of a tilt sensor of the fall prevention device.

FIG. 3 is a rear view of the tilt sensor.

FIG. 4 is a front sectional view of the tilt sensor.

FIG. 5 is a side sectional view of the tilt sensor.

FIG. 6 is a side sectional view of the tilt sensor when the crane arm is stored.

[Figure 7] Circuit diagram of the crane

FIG. 8: Another circuit diagram of the crane

[Fig. 9] Still another circuit diagram of the crane

[Explanation of symbols]

1 ... vehicle, 2 ... loading platform, 3 ... vehicle-mounted crane, 4 ... prop,
5 ... Crane arm, 6 ... Power unit, 7 ... Torii,
11 ... Tilt sensor, 14 ... Pendulum, 20 ... Limit switch.

Claims (5)

[Claims] 1. A vehicle equipped with a vehicle-mounted crane having an arm rotatable on a vertical axis about a vertical axis on a loading platform, according to an inclination detecting means for detecting an inclination of a vehicle body and a detection result of the inclination detecting means. A fall prevention device for a crane-mounted vehicle, comprising: a lifting operation prohibiting means for prohibiting a lifting operation of the crane. 2. A vehicle equipped with an on-vehicle crane having an arm rotatable on a vertical axis about a vertical axis on a loading platform, according to a tilt detecting means for detecting a tilt of a vehicle body and a detection result of the tilt detecting means. A fall prevention device for a crane-mounted vehicle, comprising down movement forcing means for forcibly moving the crane down. 3. A vehicle equipped with a vehicle-mounted crane having an arm rotatable about a vertical axis on a loading platform, and an inclination detecting means for detecting an inclination of a vehicle body and a detection result of the inclination detecting means. A fall prevention device for a crane-mounted vehicle, which is provided with a warning means for giving a warning. 4. A vehicle equipped with a vehicle-mounted crane having an arm rotatable on a vertical axis about a vertical axis on a loading platform, according to inclination detection means for detecting inclination of a vehicle body and the detection result of the inclination detection means. An overturn prevention device for a crane-mounted vehicle, comprising: an up-down operation prohibiting means for prohibiting an up operation and a down operation of the crane. 5. The fall prevention device for a crane-mounted vehicle according to claim 1, further comprising means for prohibiting the detection operation of the tilt detecting means when the crane is stored at a predetermined position.