JPH078552Y2 - Work vehicle with boom - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a work vehicle with a boom having a boom having a telescopic function.

[Background of device]

Conventionally, a mobile crane as shown in FIG. 2 has been known. In the figure, 1 is a boom that can be lifted, retracted and swiveled in a crane vehicle, 2 is a cabin, 3 is a turntable, 4 is a hoisting cylinder, 5 is a hanging wire rope, and 6 is a boom receiver. By the way, although such a crane vehicle carries out various works depending on its function, after the work is completed, it functions as a work vehicle and moves to another place. At the time of this movement, it has been found that the conventional mobile crane has a big problem. That is, when the work vehicle is moving, the boom 1 is contracted as shown in FIG. 2, but at this time, only the first boom 1a of the boom 1 is directly attached to the work vehicle. 2nd boom 1b, 3rd boom
1c is not directly attached to the work vehicle, the second boom 1b is only slidably incorporated in the first boom 1a, and the third boom 1c is slidably incorporated in the second boom 1b. It ’s just that. Therefore, if the work vehicle suddenly stops during high-speed movement, it will
The boom 1b and the third boom 1c may jump out of the first boom 1a, which is extremely dangerous. Especially under recent road conditions, it is no exaggeration to say that this risk increases and does not decrease.

[Disclosure of device]

An object of the present invention is to provide a work vehicle with a boom that does not impair safety even when it is suddenly stopped when moving at high speed. An object of the present invention is to provide a work vehicle with a boom, which has a simple structure for ensuring the above safety. The above object of the present invention is a boom-equipped work vehicle including a boom in which a second boom is telescopically installed in a first boom and a boom receiver that supports the boom when the boom is retracted. A pin is provided on the body so as to project upward, and the pins are fitted on the lower surfaces of the first boom and the second boom when they match each other in the most contracted state and when the boom receiver supports the boom. This is achieved by forming holes respectively. In addition, in the above work vehicle with a boom, it is desirable that the pin is configured to be movable back and forth.

【Example】

FIG. 1 is a schematic sectional view of an essential part of one embodiment of a work vehicle with a boom (for example, a crane vehicle) according to the present invention. Incidentally, the present invention also has a configuration of each part of the crane vehicle shown in FIG. 2, but detailed description thereof will be omitted. Reference numeral 11 denotes a boom in a crane vehicle, and a base end of a first boom 11a of the boom 11 is movably attached to a turntable rotatably mounted on a vehicle body as in the conventional one. In the first boom 11a, the second boom is also used as in the conventional one.
The boom 11b is telescopically incorporated. In the present embodiment, the boom 11
The first boom 11a and the second boom 11b will be described below, but the third boom and the fourth boom can be similarly deployed. Reference numeral 13 denotes a boom receiver that supports the boom 11 by contacting the lower surface of the first boom 11a when the boom 11 is stored. 12a is a hole formed in the lower plate of the first boom 11a at a position where it abuts on the boom receiver 13. When the second boom 11b is retracted into the first boom 11a and the boom 11 is in a contracted state, It is a hole formed at a position corresponding to a hole 12a formed in the lower plate of the first boom 11 of the lower plate of the two boom 11b. Reference numeral 14 denotes a lock pin mounted on the boom receiver 13 so as to be vertically slidable (movable and retractable), and a spring 15 for biasing the lock pin 14 upward is provided between the lock pin 14 and the boom receiver 13. Is provided. Then, normally, the lock pin 14 is projected upward by the force of the spring 15, but if a downward force is applied to the lock pin 14, the lock pin 14 is locked.
The 14 can be retracted into the boom receiver 13. Although not shown, a sensor for detecting the retracted state of the lock pin 14 or a sensor for detecting that the spring 15 is compressed more than a predetermined value is provided,
The holes 12a and 12b of the boom 11 in the contracted state are detected by this sensor.
It is possible to detect whether or not the lock pin 14 is inserted in the. The crane vehicle configured as described above is in the state shown in FIGS. 1 and 2 with the second boom 11b still inserted in the first boom 11a, for example, during normal high speed movement. When the crane truck suddenly stops from this state, the inertial force causes the second boom 11b to jump out of the first boom 11a, but the lock pin 14 causes the first boom 11a to move.
Into the hole 12a of the second boom 11b and the hole 12b of the second boom 11b,
As a result, the second boom 11b does not jump out of the first boom 11a because it is locked. Therefore, even if the crane vehicle suddenly stops during high speed movement, its safety is not impaired. Whether or not the boom 11 is locked by the lock pin 14 can be detected by the above-mentioned sensor. Therefore, when the lock 11 is not locked, it is possible to know that the boom 11 is not completely contracted. Yes, and in that case, the correction work is performed accordingly. When the mobile crane extends its boom 11 in a stopped state of the mobile crane, that is, when the second boom 11b is pushed out of the first boom 11a by the force of the hydraulic cylinder,
Since 11 is first separated from the boom receiving member 13, the lock on the boom 11 by the lock pin 14 is released. That is, the second boom 11b becomes movable, and the second boom 11b can be pushed out of the first boom 11a. On the contrary, when the boom 11 is contracted, the boom 11 is not on the boom receiver 13, and therefore the same operation as that of the conventional crane vehicle may be performed. As described above, the crane vehicle according to the present invention in which the boom 11 and the boom receiving member 13 are provided with the mechanical lock mechanism does not interfere with the work using the frame 11, and the high speed of the crane vehicle is high. Even when there is a sudden stop during movement, the second boom 11b does not pop out, which is highly safe.

【effect】

A boom-equipped work vehicle according to the present invention is a boom-equipped work vehicle that includes a boom in which a second boom is telescopically installed in a first boom, and a boom receiver that supports the boom when the boom is stored. A pin is provided on the boom receiver so as to project upward, and the pins are fitted to the lower surfaces of the first boom and the second boom in the most contracted state and when the boom receiver supports the boom. Since the holes are formed so that each of them can be inserted and the pins are configured to move forward and backward, there is no problem in working with the boom, that is, expanding and contracting the boom for work. Does not cause any problems, and even if there is a sudden stop when the work vehicle with a boom moves at high speed, the boom does not pop out due to inertial force, and the safety is high. Stage requires only one simple, has a feature that can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an essential part of one embodiment of a boom-equipped work vehicle according to the present invention, and FIG. 2 is a perspective view of a mobile crane. 11 ... boom, 11a ... first boom, 11b ... second boom, 12a,
12b ... hole, 13 ... boom support, 14 ... lock pin, 15 ... spring.

Claims (2)

[Scope of utility model registration request] 1. A work vehicle with a boom, comprising: a boom in which a second boom is telescopically incorporated in a first boom; and a boom receiver for supporting the boom when the boom is retracted. Is provided with a pin so as to project upward, so that the lower faces of the first boom and the second boom are fitted in the lowest contracted state, and the pin is fitted when the boom receiver supports the boom. A work vehicle with a boom, each of which has holes. 2. The boom-equipped work vehicle according to claim 1 of the utility model registration claim, wherein the pin is configured to be movable back and forth.