JP2500646Y2 - Aerial work vehicle equipped with a lifting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle equipped with a lifting device.

[0002]

2. Description of the Related Art Conventionally, as this type of aerial work vehicle, a post is erected at the tip of a boom that can be raised and lowered, as seen in the one described in Japanese Utility Model Application Laid-Open No. 64-39396. The work platform is horizontally swingable, and the hoisting device is horizontally swingable on the top of the post.The holding cylinder connected between the tip of the boom and the post keeps the work platform against the ups and downs of the boom. It is provided that is configured to hold horizontally at all times.

[0003]

However, in the above-mentioned conventional apparatus, since the base end portion of the holding cylinder is arranged in the tip end portion of the boom, maintenance and inspection are difficult, and the piping in the boom and the holding cylinder are difficult. It was necessary to consider both parties so as to avoid interference with.

Further, as means for securing the swing of the hoisting device, a plurality of fixing holes are formed on the circumference of the post on the circumference,
The lifting device is fixed by inserting and locking a fixing pin into one of these fixing holes and a fixing hole formed in the lifting device.
However, with the above-mentioned lashing by the pin hole, the processing becomes complicated, and the turning is lashed only at the position corresponding to the fixing hole, and the lashing at an arbitrary position cannot be performed, which is convenient. There was a problem of being bad.

[0005]

An aerial work vehicle equipped with a hoisting device according to the present invention has a post erected at the tip of a boom that can be raised and lowered, and a revolving arm provided with a workbench on the post pivots horizontally. In an aerial work vehicle that is freely provided and has a lifting device at the upper end of the post, the post has a post body that rotatably supports the swing arm, and a lower end of the post body is taper-fitted to the post body. And a holding cylinder for horizontally holding the workbench between the post body and the tip of the boom. On the other hand, the lower end of the shaft member is fastened to the post body by a fastening member at a position offset from the axis of the shaft member,
Further, the mounting member of the lifting device is taper-fitted to the upper end of the shaft member so as to be horizontally rotatable, and the mounting member is pressed against the upper end of the shaft member and fixed at an appropriate swivel position. A securing member having a handle is provided.

[0006]

By arranging the holding cylinder substantially vertically between the post body and the tip of the boom, maintenance and inspection of the holding cylinder can be easily performed, and the post body and the lower end of the shaft member can be connected to the shaft member. By fastening with a fastening member at a position deviated from the axis of the shaft, the pivoting arm can be smoothly pivoted by preventing the shaft member from rattling or shifting due to the friction due to the taper fitting and the shearing force of the bolt. Further, by pressing the attachment member of the lifting device against the upper end portion of the post by the lashing member having the handle, the lifting device is fixed at an appropriate turning position.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic overall structure of an aerial work vehicle.

In the aerial work vehicle 1, a swivel base 3 is rotatably mounted on a vehicle body 2 by a swivel motor (not shown), and a boom 4 is provided at an upper end of the swivel base 3 so as to be capable of hoisting. The boom 4 is a multi-stage telescopic type, and is configured to be telescopic by a telescopic cylinder (not shown), and can be hoisted by a hoisting cylinder 5 arranged between the boom 4 and the swivel base 3. A post 6 is erected on the tip of the boom 4,
A workbench 8 is provided on the post 6 via a revolving arm 7.

As shown in FIGS. 2 and 4, the post 6 has a post main body 61 which rotatably supports the base end of the rotary arm 7, and a taper fitting of the lower end to the post main body 61. It is composed of a shaft member 65.

A lower end of the post body 61 is vertically rotatably supported by a horizontal shaft 62 on a bracket 41 provided at the tip of the boom 4, and a base of the revolving arm 7 is provided on a peripheral surface of the upper end. The ends are fitted. Further, a holding cylinder 9 arranged substantially horizontally is connected between the lower end of the post body 61 and the bracket 41, and the work cylinder 8 provided at the tip of the revolving arm 7 is connected to the boom 4 of the boom 4 by the holding cylinder 9. It is configured to be held in a horizontal state at all times with respect to undulations. As described above, by disposing the holding cylinder 9 in the vertical state and outside the tip of the boom, maintenance and inspection can be easily performed, and the configuration can be simplified and the weight can be reduced.

The shaft member 65 is formed with tapered shafts 65a and 65b whose upper and lower ends are tapered gradually. The lower tapered shaft 65b is fitted into the post body 61 and the upper tapered shaft is formed. Lifting device 10 on 65a
The mounting bracket (mounting member) 11 is taper-fitted.

The lower taper shaft 65b is fixed to the post body 61 by a bolt (fastening member) 66 screwed in from the post body 61 side, and the bolt 66 is located at a position offset from the axis of the lower taper shaft 65b. The taper shaft 65b and the post body 61 are screwed together.

By screwing the lower taper shaft 65b and the post body 61 with the bolt 66 at a position deviated from the axis of the lower taper shaft 65b, the shaft due to the friction due to the taper fitting and the shearing force of the bolt 66. It is possible to prevent rattling and displacement of the member 65, and to swivel the swivel arm 7 smoothly. Further, it is possible to eliminate the play of the revolving arm 7 due to the backlash which occurs when the rotation of the shaft member 65 is stopped by a key or a spline as in the conventional case.

A sprocket 67 is fixed to the intermediate portion of the shaft member 65 by welding. A chain 68 is wound around the sprocket 67, and both ends of the chain 68 are a pair of cylinders 69, 6 arranged on the revolving arm 7.
It is fixed to the rod end of 9 (see FIG. 5). The cylinders 69, 69 are configured to simultaneously expand and contract in opposite directions, and the revolving arm 7 is moved around the post body 61 by the reaction force acting on the sprocket 67 via the chain 68 by the expansion and contraction operation of the cylinders 69, 69. Turn horizontally. That is, the work table 8 provided at the tip of the turning arm 7 also turns by turning the turning arm 7.

Here, in the past, the swivel arm 7 was generally swung by a motor, but in swiveling the swivel arm 7 by a motor, the low speed efficiency of the motor is poor, so the motor reaches a certain number of revolutions or more. If not, the revolving arm 7 could not be revolved, but as described above, the pair of cylinders 6
By swiveling the swivel arm 7 with 9, 69, the swivel arm 7 can be operated at a low speed, and the workbench 8 can be easily aligned.

Further, at the upper part of the mounting bracket 11 taper-fitted to the upper taper shaft 65a, the fastening member 2 is provided.
0 is provided. As shown in FIGS. 3 and 4, the securing member 20 secures the turning motion of the mounting bracket 11 with respect to the upper taper shaft 65a, and includes the handle 21 and
It is composed of a bolt 22 that is connected to the handle 21 and that is screwed into the upper taper shaft 65a, and a boss 23 that is provided integrally with the bolt 22 and that is arranged at the bottom of the flange 11a of the mounting bracket 11. Therefore, handle 2
By rotating 1 to tighten the bolt 22 to the upper taper shaft 65a side and press the mounting bracket 11 against the upper taper shaft 65a by the boss 23, the turning motion of the mounting bracket 11 is fixed and the handle 21 is rotated. Move it to loosen the bolt 22 and use the boss 23 to mount the bracket 11.
The flange 11a is lifted upward and the mounting bracket 11 is slightly moved upward from the upper taper shaft 65a, so that the friction at the taper fitting portion is reduced and the mounting bracket 11 is free to rotate. That is, the handle 2
By the operation of 1, the hoisting device 10 provided on the mounting bracket 11 can be securely fastened easily at an appropriate turning position without rattling.

As shown in FIG. 2, the hoisting device 10 comprises a hoisting boom 12 and a winch device 14 for winding or sending out a wire 13 suspended from the tip of the hoisting boom 12, which is conventionally known. An appropriate hook member 15 (see FIG. 1) is fixed to the tip of the wire 13.

As shown in FIG. 2, the workbench 8 is connected to the tip of the revolving arm 7 via a connecting member 71.
Vertical connection shaft 7 between the tip of the swing arm 7 and the connection member 71
It is configured so that it can be horizontally swung around 2 and can be moved up and down along a guide member 73 by a lift cylinder (not shown).

The horizontal swivel actuating mechanism centering on the vertical connecting shaft 72 is constructed in the same manner as the horizontal swivel actuating mechanism at the base end portion of the swivel arm 7 centering on the post body 61 described above. 72 fixed sprocket 75
A chain 76 wound around a sprocket 75, and a pair of cylinders 77 provided on the connecting member 71 and fixed to both ends of the chain 76.

Outriggers (not shown) are provided at a total of four positions on the left and right sides of the front and rear of the vehicle body 2 so as to project laterally to the vehicle body. It is set up.

The aerial work vehicle 1 equipped with the lifting device 10 constructed as described above, after supporting the vehicle body 2 by the jack 90, causes the boom 4 to pivot, extend and retract, and raise and lower, as well as the pivot arm 7 and The connecting member 71 is swung, and the workbench 8 is moved up and down to arrange the workbench 8 at an appropriate height position to perform work at a height.

When the hoisting device 10 is used, the handle 21 is pivotally operated to fix the hoisting device 10 in an appropriate turning position and perform the hoisting operation.

[0024]

As described above, according to the present invention, the maintenance cylinder can be easily maintained and inspected by disposing the retention cylinder substantially vertically between the post body and the tip of the boom. In addition, the structure is simple and the weight can be reduced.

Further, by fastening the post body and the lower end portion of the shaft member with the fastening member at a position offset from the shaft center of the shaft member, friction due to taper fitting and rattling of the shaft member due to shearing force of the bolt are secured. It is possible to prevent slipping and misalignment, to smoothly swivel the swivel arm, and to eliminate play in the swivel arm due to play that occurs when the shaft member is prevented from rotating with a key or spline as in the past. . Also, since the post body and the shaft member are fastened by the fastening member, the shaft member can be removed from the post body by releasing the fastening by the fastening member, and maintenance and inspection of the swivel arm, replacement of parts, etc. Can be done easily.

Further, by providing the mounting member of the hoisting device with the securing member having the handle for pressing the mounting member against the upper end portion of the post to secure the hoisting device, the hoisting device can be easily rotated at an appropriate turning position. In addition, it is possible to securely bind the rattle without rattling.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic overall configuration of an aerial work vehicle equipped with a lifting device according to the present invention.

FIG. 2 is a side view showing the vicinity of the tip of the boom.

FIG. 3 is an enlarged plan view showing a fastening member.

FIG. 4 is an enlarged side view showing the overall structure of the post.

FIG. 5 is an enlarged plan view showing a turning operation mechanism of a turning arm.

[Explanation of symbols]

 1 Aerial work vehicle 4 Boom 6 Post 61 Post body 65 Shaft member 66 Bolt (fastening member) 7 Revolving arm 8 Working table 9 Holding cylinder 10 Lifting device 11 Mounting bracket (mounting member) 20 Secured member 21 Handle

Claims (1)

(57) [Scope of utility model registration request] 1. A post in which a post is erected at the tip of a hoisting boom, a swivel arm having a workbench is horizontally swiveled on the post, and a hoisting device is provided at the upper end of the post. In the work vehicle, the post is composed of a post main body that supports the swing arm so as to freely rotate, and a shaft member whose lower end is taper-fitted to the post main body, and the post main body extends in a direction perpendicular to the tip of the boom. And a holding cylinder for horizontally holding the workbench is disposed substantially vertically between the post body and the tip of the boom, while the lower end of the shaft member is a shaft of the shaft member. The post body is fixed to the post body at a position offset from the core by a fastening member, and further, a mounting member of the lifting device is taper-fitted to the upper end portion of the shaft member so as to be horizontally rotatable, and the mounting member is attached to the mounting member. On the upper end of the shaft member An aerial work vehicle equipped with a lifting device, wherein a lashing member having a handle for pressing and lashing at an appropriate turning position is provided.