JP4953530B2 - Boom tip light of boom type work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boom tip lamp attached to a boom tip of a boom type work vehicle.
[0002]
[Prior art]
FIG. 5 shows a conventional technique in which a boom tip lamp 2 is attached to a wheel crane 1 as an example of a boom type work vehicle. In the wheel crane 1, an upper swing body 4 is rotatably mounted on a lower traveling body 3, and an operating room 5 capable of traveling operation and crane operation is mounted on the upper swing body 4. Reference numeral 6 denotes a telescopic boom which is pivotally attached to the upper swing body 4 so as to be raised and lowered.
[0003]
FIG. 5 shows a traveling posture of the wheel crane 1 in which the boom 6 is fully contracted, is most collapsed, and the tip portion 6 a of the boom 6 is turned forward of the lower traveling body 3. In general, an effort is made to shorten the overall length of the lower traveling body 3 in order to improve the approachability to narrow spaces. On the other hand, the boom 6 has a long overall length when fully reduced in order to ensure a lift during crane operation. Therefore, the layout is such that the lower traveling body front end portion 3a in the traveling posture projects to the boom front end portion 6a (LB dimension shown in FIG. 5). While the wheel crane 1 is traveling on a public road, it is safer to inform the surrounding vehicle, passers-by, etc. of the presence of the boom tip 6a. Especially for nighttime safety, the boom tip light 2 is connected to the boom tip. It was attached to.
[0004]
However, the boom 6 is constructed by inserting the second boom 8, the third boom 9 and the like into the base boom 7, and then inserting the top boom 10 into and out of the boom. It was not easy to attach the 2 and supply electricity from the base boom 7 side to light the boom tip lamp 2. That is, it is sufficient to install a dedicated power supply cord reel, but this is not a practical method because of a large cost increase. Therefore, as a second best measure, the boom tip lamp 2 is attached to the upper part of the front portion 7a of the base boom 7 as much as possible. Even in this case, it is possible to call attention to the tip of the boom 6, but it is located slightly behind the boom most distal portion 6 a (LL dimension shown in FIG. 5) on the rear side of the boom. It was not the best mounting position.
[0005]
On the other hand, if the crane is a crane such as an overwinding detector or a boom full contraction detector, the necessary electric devices are attached to the boom tip 6a, that is, the tip of the top boom 10. A cord reel 11 for transmitting electricity from the side is attached to the side surface of the boom 6. The main body 12 of the cord reel 11 is attached to the side surface of the base boom 7, and the covered electric wire 13 is wound inside the cord reel main body 12, and is urged toward the winding side by a built-in spring. The covered electric wire 13 drawn out from the cord reel body 12 is guided by guides 14 and 15 arranged on the side surface of the boom, and the tip thereof is locked to the support 16 at the tip portion of the top boom 10. Furthermore, the covered electric wire 13 is connected to electrical components such as an overwinding detector and a full contraction detector arranged at the tip of the top boom 10.
[0006]
A slip ring is built in the inside of the cord reel body 12, and a main body side electric wire 17 electrically connected to the covered electric wire 13 is wired on the side surface of the base boom 7, and an end thereof is inside the cab 5. Is connected to an overload prevention device (not shown) disposed in
[0007]
[Problems to be solved by the invention]
As described above, the cord reel 11 that connects the base boom 7 and the tip of the top boom 10 is arranged on the side surface of the boom 6, but all the wires inside the covered electric wire 13 are arranged at the tip of the top boom. In general, the electric appliances are used in a one-to-one correspondence with the electric appliances used, and there is not much electric wire for the boom tip lamp 2. Further, increasing the number of wires included in the covered wire 13 increases the outer diameter of the covered wire 13, which requires a redesign from the cord reel body 12, and also involves an increase in cost. There wasn't.
[0008]
Therefore, the present invention does not provide a special cord reel, and does not increase the number of wires included in the currently installed cord reel 11 covered wire. A boom tip light for a boom type work vehicle capable of installing the boom tip light 2 at the boom tip portion 10 is provided.
[0009]
[Means for Solving the Problems]
In the boom tip light of the boom type work vehicle described in claim 1 of the present application, in the traveling posture, the extendable boom mounted on the lower traveling body is in a fully contracted state, and the tip of the boom is the lower traveling body. A boom tip light for a boom-type work vehicle that protrudes from the front end of the boom, wherein a cord reel for performing electrical transmission between the base boom and the top boom of the boom is disposed, and at least one of the cord reels The electric wire of the book is shared between the electric transmission to the boom tip lamp and the electric transmission of other electric equipment, and the electric transmission to the boom tip lamp can be used without impairing the electric transmission function of the other electric equipment. In addition, the electrical transmission of other electrical equipment is characterized by being used without any loss of function to the boom tip lamp .
[0010]
With this configuration, without adding a special cord reel, and without increasing the number of wires of the currently installed cord reel, the top boom tip is a better installation position as a boom tip light. Electricity for the boom tip lamp can be transmitted.
[0011]
Furthermore, the boom tip light of the boom type work vehicle described in claim 2 of the present application has the boom tip light installed at the top boom tip portion of the boom in addition to the configuration of the invention described in claim 1. It is characterized by being.
[0012]
With this configuration, by attaching it to the top boom tip, which is the best mounting position as a boom tip light, sufficient attention can be drawn to surrounding vehicles, passersby, and the like.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In describing the embodiment of the present invention, an example in which the present invention is applied to the wheel crane 1 shown and described in FIG. Accordingly, portions common to those described in the embodiments of the present invention and the prior art will be described below by using the same reference numerals and omitting detailed description.
[0014]
FIG. 1 shows a state in which a boom tip lamp according to an embodiment of the present invention is attached to a boom. Reference numeral 20 denotes a pair of left and right boom tip lights installed on the upper end portion 10 a of the top boom 10. This position is a position that is almost at the leading edge of the wheel crane 1 as a whole. Therefore, it is the best position to obtain the effect as a boom tip lamp.
[0015]
The main body 12 of the cord reel 11 is attached to the side surface of the base boom 7, and the covered electric wire 13 drawn out from the cord reel main body 12 is guided by the guides 14 and 15 disposed on the side surface of the boom, and the tip end thereof. Is locked to the support 16 at the tip of the top boom 10. Further, the covered electric wire 13 is connected to the boom tip lamp 20 and the boom full contraction detection switch 21 arranged at the upper end 10 a of the top boom 10.
[0016]
FIG. 2 is an electric circuit diagram according to the first embodiment of the portion related to the boom tip lamp 20 described above. Reference numeral 22 denotes an overload prevention device, which is a safety device for preventing overload during the crane operation of the wheel crane 1, and also functions as a control device for the entire crane. The overload prevention device 22 is installed inside the cab 5. A power line 25 directly supplies power to the input terminal 26 of the overload prevention device 22 and is connected to a PTO switch 23 and a boom tip lamp switch 24 disposed in the cab 5. An operation signal is input to the overload prevention device 22.
[0017]
27 is a switch built in the overload prevention device 22, which is connected to the input terminal 26, and opens and closes based on a logical operation of an arithmetic unit (not shown) built in the overload prevention device 22. It is. Reference numeral 28 denotes an output terminal of the built-in switch 27, and 29 denotes an output terminal of the overload prevention device 22 for the boom full contraction detection switch 21.
[0018]
Output terminals 28 and 29 of the overload prevention device 22 are connected to the electric wire 17 on the main body side of the cord reel 11 via diodes 30 and 30. The covered electric wire 13 on the side where the cord reel 11 is pulled out is connected to the boom full contraction switch 21. The covered electric wire 13 may be composed of a plurality of electric wires, but in the present embodiment, the case of one electric wire corresponding to the boom full contraction detection switch 21 is described. The boom full contraction switch 21 is a switch that closes the contact when the boom 6 is fully contracted. Further, a boom tip lamp 20 is connected in series to the boom full contraction switch 21. The two boom tip lights 20, 20 are connected in parallel and then grounded to the top boom tip 10a.
[0019]
FIG. 3 shows the logical operation of the internal arithmetic unit, showing the output to the output terminal 28 in response to the operation of the boom tip light switch 24 and the PTO switch 23 in the overload prevention device 22. In normal daytime running, the boom tip lamp switch is turned off and the PTO switch is turned off. At that time, the output at the output terminal 28 is turned off. In daytime crane work, the boom tip lamp switch is turned off and the PTO switch is turned on. At that time, the output at the output terminal 28 is turned off. In normal night driving, the boom tip light switch is turned on and the PTO switch is turned off. At that time, the output is turned on at the output terminal 28. In daytime crane work, the boom tip light switch is turned on and the PTO switch is turned on, and at that time, the output at the output terminal 28 is turned off. That is, the lighting output of the boom tip light 20 is output to the output terminal 28 of the overload prevention device 22 only during normal night driving when the boom tip light 20 needs to be turned on.
[0020]
Further, the operation of the circuit described above is as follows. As the boom 6 expands and contracts, the boom full contraction switch 21 is opened and closed, and accordingly, the output of the output terminal 29 of the full contraction detection switch 21 of the overload prevention device 22 is turned ON / OFF. Therefore, the overload prevention device 22 can detect the fully contracted state of the boom 6 regardless of whether or not the output terminal 28 of the overload prevention device 22 is turned on. That is, the wheel crane 1 can be controlled.
[0021]
On the other hand, as described above, during normal driving at night when the boom tip light 20 needs to be lit, a lighting output is output from the output terminal 28 of the overload prevention device 22, and at that time, the wheel crane 1 is in a traveling posture. Therefore, since the boom total contraction detection switch 21 is closed, the boom tip lamp 20 is lit.
[0022]
As described above, the boom tip lamp 20 is required without impairing the function of the boom full contraction switch 21 installed at the boom tip 6a while using the common wire of the covered wire 13 of the cord reel 11. Sometimes it can be lit.
[0023]
FIG. 4 is an electric circuit diagram of a portion related to the boom tip lamp according to the second embodiment. A PTO switch 23 is connected to a relay 33 that drives a normally closed contact 32. A boom tip light switch 24 is connected to a relay 35 that drives a normally open contact 34. The contacts 32 and 34 are interposed in series with the power line 25 and the fixed-side electric wire 17 of the cord reel 11 together with the diode 30.
[0024]
The operation of the electric circuit having the above-described configuration is as follows. The contact 32 is opened only when the PTO switch 23 is turned on. The contact 34 is closed only when the boom tip lamp switch 24 is turned on. Therefore, the electricity of the power line 25 is supplied to the fixed-side electric wire 17 of the cord reel 11 only when the PTO switch is OFF and the boom tip lamp switch 24 is ON. As described above, the same operation as that of the first embodiment described above can also be achieved by a method of combining a switch and a relay.
[0025]
【Effect of the invention】
As described above, the invention described in claim 1 of the present application is that at least one electric wire in the cord reel for performing electrical transmission between the base boom and the top boom of the boom is as follows. Since it is commonly used for electric transmission to the boom tip light and electric transmission of other electric devices, the number of wires of the currently installed cord reel can be further reduced without adding a special cord reel. Without increasing, electricity for the boom tip lamp can be transmitted to the top boom tip portion which is a better installation position as the boom tip lamp.
[0026]
Further, in the invention described in claim 2 of the present application, in addition to the configuration of the invention described in claim 1, since the boom tip lamp is installed at the top boom tip of the boom, It will be installed at the best mounting position, and sufficient attention can be given to surrounding vehicles and passersby.
[Brief description of the drawings]
FIG. 1 is a state in which a boom tip lamp according to an embodiment of the present invention is attached to a boom.
FIG. 2 is an electric circuit diagram of a portion related to a boom tip lamp according to the first embodiment.
FIG. 3 is a logical operation of an arithmetic device with a built-in overload prevention device.
FIG. 4 is an electric circuit diagram of a portion related to a boom tip lamp according to a second embodiment.
FIG. 5 is a diagram showing a conventional boom tip lamp attached to a wheel crane.
[Explanation of symbols]
1 is a wheel crane, 2 is a boom tip light, 3 is a lower traveling body, 4 is an upper swing body, 5 is a cab, 6 is a boom, 7 is a base boom, 8 is a second boom, 9 is a third boom, and 10 is a top Boom, 11 is a cord reel, 12 is a cord reel main body, 13 is a covered electric wire, 14 is a guide, 15 is a guide, 16 is a support, 17 is a main body side electric wire, 20 is a boom tip lamp, 21 is a boom full contraction detection switch, 22 is an overload prevention device, 23 is a PTO switch, 24 is a boom tip light switch, 25 is a power line, 26 is an input terminal, 28 and 29 are output terminals, 30 is a diode, 32 is a normally closed contact, 33 is a relay , 34 is a normally open contact, 35 is a relay

Claims (2)

In this traveling posture, the boom tip light of a boom type work vehicle in which the extendable boom mounted on the lower traveling body is in a fully contracted state and the tip of the boom protrudes from the front end of the lower traveling body. And
A cord reel for performing electrical transmission between the base boom and the top boom of the boom is disposed, and at least one electric wire in the cord reel is electrically transmitted to the boom tip lamp and other electrical devices. The electric transmission to the boom tip lamp is used without impairing the electric transmission function of other electric equipment, and the electric transmission of the other electric equipment has no function to the boom tip lamp. A boom tip light for a boom-type work vehicle characterized by being used without damage . The boom tip light of a boom type work vehicle according to claim 1, wherein the boom tip light is installed at a top boom tip portion of the boom.

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