JP2000219485A - Guide device for overwinding signal transmitting cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of damage to a coating material of a cord at the time of handling a signal transmitting cord for transmitting the detecting signal of a overwinding detecting signal fitted to a tip of a telescopic boom to a base end of the telescopic boom by fitting a tubular guide member made of resin in the forefront boom cylinder, and inserting the cord into the guide member. SOLUTION: A overwinding detecting switch 1 is fitted to a tip 4a of the forefront boom 4 of a telescopic boom 8, and a cord reel 10 for winding a signal transmitting cord extended from the detecting switch 1 is fitted to an appropriate position inside of the tip of the forefront boom 4. The cord drawn from the cord reel 10 is extended to a base end 1b of a base end boom 2 through the inside of the telescopic boom 8 so as to transmit the overwinding detecting signal to the base end of the telescopic boom 8. A tubular guide member 20 made of resin is arranged in the inner surface of a top plate of the forefront boom 4 over the nearly whole area in the axial direction of the boom cylinder, and the cord is inserted into the guide member so as to protect the coating of the cord from the damage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide device for an overwinding signal transmission cord for transmitting an overwinding detection signal detected by an overwinding detection switch attached to the distal end of a telescopic boom to the base end of the telescopic boom. It is.

[0002]

2. Description of the Related Art In a mobile crane configured to hang a hook from a distal end portion of a telescopic boom and perform a crane operation by suspending a load on the hook, the hook is moved upward by a lifting motion of the hook. An overwinding detection switch for detecting that the winding has been wound up to an overwinding state close to the unit and outputting an overwinding signal is provided.

As shown in FIG. 2, an overwinding detection switch 1 has a boom cylinder (intermediate boom 3) at the distal end inside a base end boom 2.
And the state-of-the-art boom 4) are slidably inserted sequentially,
The telescopic boom 8 is constructed by extending and retracting the intermediate boom 3 and the foremost boom 4 with respect to the base boom 2 by the telescopic drive of the telescopic cylinder 5 and suspending the hook 7 with the wire rope 6 from the distal end 4a of the foremost boom 4. Of the tip (state-of-the-art boom 4
Of the detection switch 1
The weight of the weight 9 suspended from the actuator is carried by the hook 7 due to the overwinding of the hook 7, and the supporting force is suddenly reduced, thereby detecting the overwound state of the hook 7.

The overwinding signal detected by the overwinding detection switch 1 is transmitted to the base end side of the telescopic boom 8 by using a cord 11 pulled out from a cord reel 10 mounted at an appropriate position inside the tip end of the foremost boom 4. It is transmitted to the proximal end 1b) of the proximal end boom 1 to operate the buzzer 12 and the hook lifting drive stop valve (not shown). For this reason, the telescopic boom 8
The cord 11 is fed from the cord reel 10 in accordance with the expansion and contraction of the cord 11, so that an excessive tension acts on the cord 11 and the cord 11 is not loosened.

[0005] However, when the telescopic boom 8 is extended, the distance between the supports of the cord 11 becomes large, and the cord 11 hangs down. For this reason, the tubular guide member 15 is attached over substantially the entire area of the telescopic cylinder 5 in the axial direction, and the cord 11 drawn from the cord reel 10 is stretched through the tubular guide member 15 to extend and contract with the cord 11. Cylinder 5
And the like, thereby preventing the cord 11 from being damaged (for example, the actual fairness 8-10).
No. 587).

[0006]

However, the tubular guide member 15 conventionally used is made of steel pipe, and when burrs or rust is generated inside, the cord 11 is moved with the expansion and contraction movement of the expansion and contraction boom 8. However, when moving inside the tubular guide member 15, there is a problem that the clothing material of the cord 11 is damaged and the insulation performance is deteriorated. Further, since the tubular guide member 15 is attached to the telescopic cylinder 5, the cord introduction port 15a of the tubular guide member 15 is located at a position separated from the cord outlet 10a of the cord reel 10 when the boom is extended, and the telescopic boom 8 is reduced. There is a problem that the cord 11 swings up and down when it is moved and cannot be wound around the drum regularly.

The present invention has been made in consideration of the above-described conventional problems, and provides a guide device for an overwinding signal transmission cord that prevents damage to a cord covering material and allows the cord to be regularly wound around a drum. It is intended to be.

[0008]

The present invention has the following structure as means for solving the above-mentioned problems. The present invention provides an overwinding detection switch and a code reel for detecting an overwound state of a hook at the distal end of a leading end boom cylinder in a telescopic boom in which a boom cylinder on the distal end side is sequentially slidably inserted into a base end boom. A guide for an overwinding signal transmission code guide device configured to transmit an overwinding detection signal detected by the overwinding detection switch to the base end side of the base end boom using a cord drawn from the code reel. I have.

According to the guide device of the present invention, a tubular guide member formed of a resin material is attached to the inner surface of the most advanced boom cylinder over substantially the entire area in the axial direction of the boom cylinder, and the inside of the tubular guide member passes through the inside of the tubular guide member. Then, the cord pulled out from the cord reel is stretched on the base end side of the base end boom.

[0010] With this configuration, the cord drawn from the cord reel and inserted into the tubular guide member moves on the inner surface of the tubular guide member as the telescopic boom expands and contracts. Since the material is formed of a resin material which is softer than the conventional steel pipe, the damage of the cord is small and the insulation performance is not deteriorated.

Further, since the cord reel and the tubular guide member are both mounted on the most advanced boom cylinder, the cord introduction port of the tubular guide member can be attached at a position close to the cord outlet of the cord reel. The swing of the cord is reduced, and the cord can be regularly wound around the drum.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIG. Reference numeral 8 denotes a telescopic boom, in which an intermediate boom 3 and a distal end boom 4 which are boom cylinders on the distal end side are sequentially slidably inserted into the proximal end boom 2 and interposed between the proximal end boom 2 and the intermediate boom 3. Telescopic cylinder 5
The intermediate boom 3 is extended and retracted with respect to the base end boom 2 by the extension and contraction drive of the base boom 2, and the leading end boom 4 is extended and contracted with respect to the intermediate boom 3 by the wire extension and contraction mechanism 14. A hook 7 is suspended from the tip 4a of the front end boom 4 by a wire rope 6, and a load is hung on the hook 7 to perform a crane operation. Note that in other embodiments, the telescopic boom 8 can be configured with two or more stages of telescopic booms, and the telescopic mechanism can be a well-known telescopic mechanism.

Reference numeral 1 denotes an overwinding detection switch attached to the tip 4a of the front end boom 4, which is of the same type as the overwinding detection switch described in the conventional example. Also, the code reel 10 is of the same type as the code reel described in the conventional example, and is mounted at an appropriate position inside the distal end of the foremost boom 4. The cord 11 drawn from the cord reel 10 is
A cord 11 extends along the proximal end 1b of the base boom 1 after passing through the telescopic boom 8 and moves along with the telescopic boom 8.
The detection signal of the overwinding detection switch 1 is transmitted to the base end side of the telescopic boom 8 while the amount of pulling out is adjusted. 12 is an alarm buzzer and 13 is a battery.

Reference numeral 20 denotes a tubular guide member which is attached to the inner surface of the upper plate of the foremost boom 4 over substantially the entire axial direction of the boom cylinder. The tubular guide member 20 is made of a pipe material made of hard vinyl chloride, and has a cord inlet 20a.
Is attached to the cord reel 10 at a position close to the cord outlet 10a. The cord 11 pulled out from the cord reel 10 is fixed to the proximal end 1b of the proximal end boom 1 after passing through the tubular guide member 20. In another embodiment, the material of the tubular guide member 20 can be made of a resin material such as polyethylene.

According to the guide device for an overwinding signal transmission cord configured as described above, the cord 11 pulled out of the cord reel 10 and inserted into the tubular guide member 20 is provided with the tubular guide as the telescopic boom 8 expands and contracts. Moving on the inner surface of the member 20,
Since the material of the tubular guide member 20 is formed of a resin material (for example, hard vinyl chloride) which is softer than a steel pipe generally used in the related art, damage to the covering material (generally, polyethylene) of the cord 11 is damaged. Therefore, the insulation performance is not deteriorated.

Further, since both the cord reel 10 and the tubular guide member 20 are attached to the frontmost boom 4, the cord inlet 20a of the tubular guide member 20 is attached at a position close to the cord outlet 10a of the cord reel 10. Can code
The swing of 11 is reduced, and the cord 11 can be regularly wound around the drum.

[0017]

According to the guide device of the present invention, the material of the tubular guide member for guiding the cord drawn from the cord reel is made of a resin material which is softer than a conventional steel pipe. By doing so, the damage to the cord can be reduced, and the cord can be regularly wound around the tram when the boom is contracted by attaching the tubular guide member to the most advanced boom.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a guide device for an overwinding signal transmission cord according to the present invention.

FIG. 2 is an explanatory diagram of a conventional guide device.

[Explanation of symbols]

1: Overwind detection switch, 2: Base end boom, 3: Middle boom, 4: Base end boom, 5: Telescopic cylinder,
7; hook, 8; telescopic boom, 9; weight, 10; cord reel, 11; cord, 12; buzzer, 20; tubular guide member,

Claims (1)

[Claims] 1. An overwinding detection switch and a cord for detecting an overwinding state of a hook at a distal end of a frontmost boom cylinder of a telescopic boom in which a boom cylinder on a distal end side is sequentially slidably inserted into a base end boom. A guide device for an overwinding signal transmission cord configured to attach a reel and transmit an overwinding detection signal detected by the overwinding detection switch to a base end side of a base end boom using a cord drawn from the code reel, A tubular guide member formed of a resin material is attached to the inner surface of the boom barrel over substantially the entire axial direction of the boom barrel, and a cord drawn from the code reel is passed through the inside of the tubular guide member. A guide device for an overwound signal transmission cord, wherein the guide device is configured to be stretched on a base end side of an end boom.