JPH0644760Y2 - Outrigger beam telescopic stop device for work vehicles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to contact or interference between an outer post and surrounding objects and extension of an outrigger when each outrigger of an aerial work vehicle equipped with an outrigger is extended. The present invention relates to an outrigger beam expansion / contraction stop device for a work vehicle in which an object placed on a beam is prevented from being caught between a vehicle body and a jack when the outrigger beam is contracted.

[Prior art]

In order to expand the work range as much as possible while securing sufficient safety for current crane vehicles and aerial work vehicles, etc., an outer is attached to the tip of the outrigger beam that is telescopically mounted on the front, rear, left and right of the body. Equipped with an outrigger equipped with a jack in which the inner post is elastically inserted in the post in a substantially vertical direction, the outrigger beam of each outrigger is extended to project to the outside of the vehicle body, and the jack installed at the tip of each outrigger beam The actual situation is that the inner post is lowered by a predetermined length to horizontally support the vehicle body and to stably install the vehicle body.

[Problems to be solved by the device]

However, the extension / contraction drive function of the outrigger beam of each outrigger equipped in the conventional crane truck or aerial work vehicle, etc. is simply referred to as expanding the outrigger beam by a predetermined width or reducing it by the amount overhanging when storing. The system has only the minimum functions, and no consideration has been given to a mechanism in which the expansion / contraction drive of the beam is automatically stopped regardless of the operator's operation. For this reason, for example, when performing an overhanging operation of each outrigger beam in a narrow work site, etc., if the extension amount of each outrigger beam is erroneously measured, the outer post mounted at the tip of each outrigger beam may be attached to the surrounding object (block). Various problems such as contacting or interfering with fences, electric poles, guide rails, etc., destroying or damaging surrounding objects, damage to the outer post itself, sometimes pinching a worker between the surrounding objects and the outer post, etc. Had.

[Means for Solving the Purpose and Problem of Invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to bring the outer post into contact with or interfere with surrounding objects when the outrigger is overhanging in an aerial work vehicle equipped with an outrigger. Another object of the present invention is to provide an outrigger beam expansion / contraction stop device for a work vehicle, which prevents an object placed on the extended outrigger beam from being caught between the vehicle body and the jack when the outrigger beam is contracted. At the tip of the outrigger beam that is elastically mounted on the left and right sides of the car body,
In a work vehicle equipped with jacks in which the inner posts are elastically fitted in the outer posts, respectively, in a substantially vertical manner, with a sensor for detecting contact with the outer posts of the jacks provided at the tips of the respective outrigger beams, The beam expansion / contraction driving device for expanding / contracting the outrigger beam is stopped by the detection signal of the sensor.

[Action]

Since the above-mentioned configuration is adopted, when the outrigger beam of each outrigger equipped in a crane vehicle or an aerial work vehicle is extended and projected to the left and right, and when it is contracted down, there is an object that comes into contact with the outer post. A sensor that attaches the object at an appropriate position on the outer surface of the outer post detects the contact immediately and stops the beam expansion / contraction drive device by the signal from this sensor, so something is sandwiched between it and the outer post. There are no accidents such as
Outrigger overhang or shortening work with extremely high safety can be performed.

〔Example〕

An embodiment of an outrigger beam expansion / contraction stop device for a working vehicle according to the present invention will be described in detail below with reference to FIGS. 1 to 3A and 3B.

In the figure, reference numeral 1 is an aerial work vehicle equipped with an outrigger beam expansion / contraction stop device 2 according to the present invention, and 3a ... Same as above. In the embodiment, an H-type outrigger is adopted).

Each of the outriggers 3a is equipped with an outer post 3c at the tip of each outrigger beam 3b, and a jack 3d built in each outer post 3c ... It is designed to be put out and to enhance safety against falls. By the way, in the present invention, the outer posts 3c of the respective outriggers 3a ...
Sensors for detecting contact (in the present embodiment, a pressure conductive rubber sensor is adopted, abbreviated as contact sensor hereinafter, see FIGS. 3 (a) and 3 (b)) 4 ... The predetermined detection signals detected by the contact sensors 4 ... are the outrigger beams 3 (b) ... of the outriggers 3a.
Beam expansion / contraction drive device for expanding / contracting, that is, an electromagnetic valve 6 arranged in the hydraulic oil supply passage of the hydraulic cylinders 5 ...
Relay contact cr interposed between exciting coil 6a of ... and power supply 7
It is configured to be input to the relay CR that opens and closes.

Hereinafter, the operation of the outrigger beam expansion / contraction stop device for a working vehicle according to the present invention will be described based on the above configuration.

That is, the outrigger beam expansion / contraction stop device 2 for a work vehicle according to the present invention is equipped with each outrigger beam 3b of each outrigger 3a ...
Contact sensors 4 are attached to the upper peripheral surfaces of the outer posts 3c attached to the tips of the contact posts 4, and the predetermined detection signals detected by the contact sensors 4 are sent to the outriggers 3a.
The outrigger beams 3b of ... are configured to be input to the relay CR interposed between the exciting coil 6a of the electromagnetic valve 6 disposed in the hydraulic oil supply path of the hydraulic cylinder 5 that drives the hydraulic cylinder 5 ... For example, as shown in FIGS. 1 and 3 (b), after the scaffolding plate W is laid between the front and rear outrigger beams 3b, 3b on the left side and the predetermined work is completed, the outrigger beams 3b, 3b are stored. That is, when shortening,
Even if both outrigger beams 3b and 3b are shortened by forgetting that the scaffold plate W is placed, the existence of the scaffold plate W is confirmed by the contact sensors 4 and 4 contacting each other. That is, when both contact sensors 4, 4 come into contact with the scaffold plate W, both contact sensors 4, 4 are turned on,
Since the relay CR excites to turn off the relay contact cr, the exciting coil 6 of the electromagnetic valves 6, 6 is connected via the relay contact cr.
The predetermined current flowing in a and 6a is cut off. Therefore,
Since the electromagnetic valves 6 and 6 are switched to the b position, the supply of hydraulic oil to the hydraulic cylinders 5 and 5 that is shortening the outrigger beams 3b and 3b is cut off, and the shortening movement of both outrigger beams 3b and 3b is stopped. . That is, since the scaffold plate W can be removed without being sandwiched between the outrigger beams 3b and 3b and the vehicle body, damage to the outrigger beams 3b and 3b and the scaffold plate W can be avoided in advance. .

Similarly, when the both outrigger beams 3b, 3b are expanded, and the both outrigger beams 3b, 3b are
Even if there is an interfering object X in front of, the contact sensors 4 and 4 detect the interfering object X and excite the relay CR to turn off the relay contact cr. The predetermined current flowing in the exciting coils 6a, 6a of the electromagnetic valves 6, 6 is cut off. Therefore, since the electromagnetic valves 6 and 6 are switched to the b position, the supply of hydraulic oil to the hydraulic cylinders 5 and 5 that are extending the outrigger beams 3b and 3b is cut off, and the extension movements of both outrigger beams 3b and 3b are stopped. Therefore, unnecessary collision of the outrigger beams 3b, 3b with the interference X is avoided in advance.

Although the contact sensor 4 is adopted as the sensor for detecting the contact in the above embodiment, the same effect can be obtained as long as it has the same function or operation. It is not limited to the examples.

Further, in the above embodiment, the case where the scaffolding plate W is sandwiched between the both outrigger beams 3b, 3b has been described, but for example, the scaffolding plate material is slantedly inserted between one (one) outrigger beams 3b. Needless to say, the case where W or the like is sandwiched can be detected similarly.

[Effect of device]

As described in detail above, the present invention is such that a jack having an inner post elastically fitted inside an outer post is substantially vertically attached to the tip of an outrigger beam that is elastically mounted on the front, rear, left, and right sides of the vehicle. In the work vehicle equipped with the above, a sensor for detecting contact is attached to the outer post of the jack equipped at the tip of each of the outrigger beams, and a beam expansion / contraction drive for expanding / contracting the outrigger beam by the detection signal of the sensor. Since it is configured to stop the operation of the device, when the outrigger beam of each outrigger equipped on a crane vehicle or aerial work vehicle is projected left and right, or shortened, if there is an object that contacts the outer post, A sensor that detects the contact by mounting the inclusion at an appropriate position on the outer surface of the outer post Since stopping the beam expansion drive by detecting and detection signal to the Chi, accidents such as that something is broken or damaged sandwiched between the outer post becomes nil,
It has various excellent effects such as extremely safe outrigger overhang and shortening work.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a work vehicle equipped with an outrigger beam expansion / contraction stop device according to the present invention, FIG. 2 is a schematic circuit diagram of the outrigger beam expansion / contraction stop device equipped in the same work vehicle, and FIG. ), (B) are the same operation state explanatory diagrams of the outrigger beam expansion / contraction stop device. 1 ... Aerial work vehicle, 2 ... Outrigger beam expansion / contraction stop device,
3a ... Outrigger, 3b ... Outrigger beam, 3c ... Outer post, 3d ... Jack, 4 ... Contact sensor, 5 ... Hydraulic cylinder, 6 ... Electromagnetic valve, 6a ... Excitation coil, 7 ... Power supply, CR ... Relay, cr ... Relay contact , W ... Plate material for scaffolding,
X ... Interfering object.

Claims (1)

[Scope of utility model registration request] 1. A work vehicle in which jacks each having an inner post elastically fitted in an outer post are installed substantially vertically at the tip of an outrigger beam which is elastically mounted on the front, rear, left and right sides of the vehicle, respectively, outside the car body. At this time, a sensor for detecting contact is attached to the outer post of the jack equipped at the tip of each outrigger beam, and the operation of the beam expansion / contraction drive device for expanding / contracting the outrigger beam is stopped by the detection signal of the sensor. An outrigger beam expansion / contraction stop device for a work vehicle characterized by the above.