JPH0725386Y2 - Ladder unloader for aerial platforms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a ladder unloading device for an aerial work vehicle.

(Prior Art) As shown in FIG. 4, an aerial work vehicle in which a boom 4 having a bucket 3 at its tip is mounted on a vehicle 2 behind a driver's cab 1 so as to be capable of swinging and undulating, particularly the boom 4 is provided. As a ladder unloading device used for an aerial work vehicle that travels in a boom retracted posture in which the vehicle is tilted in the front-rear direction, a base end of the ladder is pivotally connected to one side of the vehicle 2, The hydraulic cylinder 5 is rotated between an upright position A standing upright on one side of the vehicle 2 and a hanging position B hanging down from one side of the vehicle 2, and two side portions in the longitudinal direction of the ladder 6 can be attached to the side surfaces thereof. In the standing position A of the rotating frames 7 and 7, the front portion of the ladder 6 attached to the rotating frames 7 and 7 is located above the cab 1 and the ladder. The rear part of 6 is in an inclined state lower than the front part, and the width direction of the ladder 6 is almost lead. A ladder unloading device configured to follow the face is attached.

This type of ladder unloading device has been widely used in recent years because the ladder can be repositioned between the retracted position within the vehicle width and the ladder attachment / detachment position lower than that by simply rotating the rotating frames 7, 7. ing.

(Problems to be solved by the invention) However, in the conventional ladder unloading device of this type, the direction of the rotation axis X of the rotating frames 7, 7 is configured to be parallel to the inclined state Y of the ladder. Therefore, the rotating frames 7 and 7 are suspended at the hanging position B.
When it is set to (ladder attachment / detachment position), the front part of the ladder attached to the rotating frames 7 and 7 is at a high position, and there is a problem that the attachment and detachment of the ladder is troublesome.

This invention intends to provide a ladder unloading device that solves the above-mentioned problems of the prior art.

(Means for Solving Problems) In order to solve the above problems, the ladder unloading device of the present invention is provided with the rotating frame in the conventional ladder unloading device.
The direction of the rotation axis X of 7, 7 is configured to be looser than the inclined state Y of the ladder 6.

(Operation) According to the above configuration, when the rotating frames 7, 7 are set to the hanging position,
Since the front part of the ladder is displaced further downward than the rear part and the front part of the ladder is located at a lower position, the ladder can be easily attached and detached.

(Embodiment) An embodiment of the ladder unloading device for an aerial work vehicle according to the present invention will be described below with reference to FIGS. The ladder unloading device of the present invention is different from the conventional ladder unloading device described in the related art in that the direction of the rotation axis X is looser than the inclined state of the ladder 6. Since the other parts are the same, the reference numerals 1 to 7, the reference symbol A, the reference symbol B, and the reference symbol Y used in the conventional technique will be omitted in the following description. As shown in FIG. 1, the rotating frames 7 and 7 are arranged in front and rear pair on one side of the vehicle 2 in order to attach two portions in the longitudinal direction of the ladder 6. A rotating frame 7 arranged at the rear of the vehicle 2 is pivotally connected to a base end portion of the rotating frame 7 so as to be rotatable about a shaft 8, and a position A standing upright on one side of the vehicle 2 by a hydraulic cylinder 5 via a link. And a hanging position B hanging from one side of the vehicle 2. On the other hand, a rotating frame 7 arranged in front of the vehicle 2 is pivotally connected to a base end portion thereof so as to be rotatable around a shaft 9.
Reference numeral 10 denotes a lock device, which operates the operation lever 11 to insert the lock pin 12 into a hole provided at the base end portion of the rotating frame 7 so as to fix the rotating frame 7 to the standing position A, and to operate it. By operating the lever 11 and pulling out the lock pin 12 from the hole, the rotating frame 7 can be hung down to the hanging position B. In each of the rotating frames 7 arranged in front of and behind the vehicle 2,
It has a frame 13 having a U-shaped cross section and a lid member 14 for covering the opening of the frame 13 having a U-shaped cross section, one end of the lid member 14 and one end of the frame 13 having a U-shaped cross section. Are connected by a hinge 15, and the other end of the lid member 14 and the other end of the frame 13 having a U-shaped cross section are stopped with the opening of the frame 13 having a U-shaped cross section being covered by the lid member 14. Money
It is designed to be connected by 16. That is, after the stopper 16 is removed and the lid member 14 is opened, a frame having a U-shaped cross section is formed.
The ladder 6 is inserted into the inside 13, the lid member 14 is closed, and the frame 13 having a U-shaped cross section and the lid member 14 are connected by the stopper metal 16 to attach the ladder 6 to the rotating frame 7. Reference numeral 17 denotes a stop member, which is composed of a pair of brackets arranged at positions spaced apart from each other in the front and rear in a frame 13 having a U-shaped cross section of the rotating frame 7 arranged at the rear of the vehicle 2. ing. The stopper member 17 is arranged to sandwich the lattice of the ladder 6 between the pair of brackets and prevent the ladder 6 attached to the rotating frames 7 and 7 from being worn in the front-rear direction. Reference numeral 18 denotes a rotation axis line, which positions the rotation shafts 8 and 9 of the rotation frames 7 and 7 arranged in the front and rear of the vehicle 2 on the same straight line, respectively, relative to the inclined state Y of the ladder 6. It is loosely structured. Also, the shaft 8,
9 is arranged so as to be separated from the base ends of the rotating frames 7, 7 so that the ladder 6 can be stored in the vehicle width at the standing position A, and the ladder 6 can be made to project more than the vehicle width at the hanging position B. There is. Moreover, the rotation axis 18 is configured to be looser than the tilted state Y of the ladder 6, and when the rotation frames 7, 7 are in the hanging position, the front portion of the ladder 6 is displaced further downward than the rear portion. However, the front portion of the ladder 6 is at a lower position so that the ladder 6 can be easily attached and detached.

The ladder unloading device configured as described above uses the following safety device. First, a switch 19 for detecting that the rotating frame 7 arranged at the rear of the vehicle 2 is in the standing position A is arranged, and when the switch 19 is operated, the turning motion of the boom 4 is restricted. . That is, the ladder 6 is attached to the rotating frame 7 and the rotating frame 7 is set to the standing position A.
In this state, when the swivel base rotatably arranged on the vehicle 2 is swung, the swivel base and the boom 4 and the like arranged on the swivel base can be prevented from interfering with the ladder 6. It is a thing. In addition, the rotating frame 7 is placed in the hanging position B.
In this case, since the rotating frame 7 and the ladder 6 project from the vehicle width, the vehicle 2 cannot run in this state. Therefore, if the rotating frame 7 is not in the standing position A, the vehicle 2
The following measures are taken to prevent the vehicle from running. That is, an outrigger for ensuring stability of the vehicle 2 by contacting the ground when working at a high place is always arranged in this type of aerial work vehicle. Therefore, when working at a high place, first, the outriggers are extended to make contact with the ground to ensure the stability of the vehicle 2 and then work at a high place. When the work at a high place is completed, the outrigger is stored at the end so that the work vehicle at a high place is in a traveling state. Therefore, an outrigger bulging state detection switch is provided, and if the outrigger is not bulged by this switch and the switch 19, the ladder 6
So that it cannot hang from the standing position A to the hanging position B,
If the ladder 6 is not in the standing position A, the outriggers cannot be extended and stored. As described above, the lock device 10 is arranged on the rotating frame 7 arranged in front of the vehicle 2, but the lock device 10 is arranged for the following purpose. That is, the rotating frames 7, 7 arranged in front and behind the vehicle 2 are the ladders 6 attached to the rotating frames 7, 7.
The rotating frame 7 arranged in front of the vehicle 2 has no rotating means (hydraulic cylinder 5 and link, etc.). Therefore, when the ladder 6 is not attached to the rotary frames 7, 7, the rotary frame 7 arranged in front of the vehicle 2 cannot be rotated and fixed at the standing position A. Especially when the vehicle 2 is run without attaching the ladder 6 to the rotating frames 7 and 7, the rotating frame 7 arranged in front of the vehicle must be fixed in the standing position, which is for use at this time. Is. However, attaching the ladder 6 to the rotating frames 7,7,
If the rotating frame 7 is fixed to the standing position A by the lock device 10 and the rotating frames 7, 7 are hung down to the hanging position B by the hydraulic cylinder 5, the locking device 10, the ladder 6, etc. are damaged. There is a risk of doing it. Therefore, a switch 20 for detecting that the lock pin 12 is inserted into the hole provided at the base end portion of the rotating frame 7 is arranged, and when the switch 20 is operating, the operation of the hydraulic cylinder 5 is restricted. I have to.

The ladder unloading device for an aerial work vehicle of the present invention constructed as described above operates as follows. The outrigger is extended and grounded from the aerial work vehicle that is currently running. Next, the hydraulic cylinder 5 is extended and the rotating frames 7, 7 are hung from the standing position A to the hanging position B. At this time, the front part of the ladder 6 is displaced further downward than the rear part, and the front part of the ladder 6 is at a lower position. In this state, the stoppers 16 of the rotating frames 7 and 7 arranged at the front and rear of the vehicle 2 are removed, the lid members 14 and 14 are opened, and the ladder 6 is taken out from the frames 13 and 13 having a U-shaped cross section. On the contrary, when the ladder 6 is stored, the above-mentioned reverse operation may be performed. Further, even when the ladder 6 is not used, if the rotating frames 7 and 7 are positioned at the hanging position B, the ladder 6 can be placed on the swivel base, the boom 4 and the like when working at a high place without lowering the ladder 6. It does not interfere and interfere.

In the above embodiment, the rotating frames 7 and 7 are arranged in a pair in the front and rear of the vehicle 2 so as to be spaced apart from each other, but they may be integrally formed without separating them. In this case the locking device 10 and the switch 20
Can be omitted.

(Advantages of the Invention) Since the ladder unloading device for an aerial work vehicle of the present invention is configured and operates as described above, the ladder can be easily attached and detached.

[Brief description of drawings]

1 to 3 are explanatory views of a ladder unloading device for an aerial work vehicle according to the present invention, and FIG. 4 is an explanatory diagram of a conventional ladder unloading device for an aerial work vehicle. 1: Driver's cab, 2: Vehicle, 3: Bucket, 4: Boom, 5: Hydraulic cylinder, 7,7: Rotating frame, 18: Rotating axis, A: Standing position, B: Hanging position, Y: Tilt state

Claims (1)

[Scope of utility model registration request] 1. An aerial work vehicle in which a boom equipped with a bucket at its tip is mounted on a vehicle at the rear of a driver's cab so that the boom can be swung and raised and lowered. A ladder unloading device used in a traveling aerial work vehicle, the base end of which is rotatably pivotally connected to one side of the vehicle and which is erected on one side of the vehicle by a hydraulic cylinder. A turning frame that is turned between a position and a hanging position that hangs down from one side of the vehicle, and that is provided with a turning frame on its side surface so that two positions in the longitudinal direction of the ladder can be attached. A structure in which the front part of the ladder attached to the rotating frame is located above the driver's cab, the rear part of the ladder is inclined lower than the front part, and the width direction of the ladder is substantially along the vertical plane. Of the rotation axis of the rotation frame. Direction ladder loading ruled device aerial platforms, characterized in that have configured gentler than inclination of the ladder