JPS6349461Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an aerial work vehicle used for various works such as painting work and repair work at high places. The present invention relates to a chassis that supports an extendable boom rotatably about a vertical axis.

It has been found that in aerial work vehicles, the maximum overturning moment occurs when the boom, which is pivotably mounted on the center of the chassis, is fully extended and as close to horizontal as possible. There is.
In order to prevent this overturning moment, a large counterweight is attached to the revolving frame serving as the boom support on the opposite side of the boom extension direction, that is, on the rear side.
In addition, in order to prevent the vehicle from falling over, it is effective to increase the weight of the chassis itself that supports the swivel mount to lower the center of gravity of the entire vehicle as much as possible. In order to make the chassis heavier, the chassis is manufactured using a thin steel plate, or by attaching weights to a thin steel plate.

However, in the former type of thick steel plate, the cost is extremely high because the steel plate is expensive, and furthermore, due to differences in models (differences in ranks classified according to the overall length of the boom), the length of the chassis or The width must be changed to adjust the weight, making it impossible to standardize the chassis. On the other hand, the latter method of adding weights is not only expensive, but also has restrictions on the installation space for the weights, making it difficult to adjust the weight. In other words, the main body of a chassis is generally comprised of a pair of left and right side members that extend parallel to each other in the front-rear direction, but there is usually no hydraulic oil or gasoline between the two side members. Since each tank and related auxiliary equipment are arranged, the area that can be used as weight installation space is limited to the outside of the side member. However, since wheels are placed in front and behind this point, the weights must be installed within a range that does not interfere with the turning angle of the wheels and does not protrude from the width of the vehicle, so it is difficult to add the necessary weights. There are difficulties in terms of space.

In view of the above-mentioned conventional problems, the purpose of the present invention is to improve the side member, which is a component of the chassis.
A hollow member with a rectangular vertical cross section formed of a steel plate to ensure strength, and a filler such as concrete with a high specific gravity, waste casting sand, etc. that is adjusted and filled in the space of the hollow member. It is an object of the present invention to provide an aerial work vehicle that is constructed with heavy members such as the above, and which makes it possible to reduce costs and to make the chassis common to various models.

Hereinafter, embodiments of the present invention will be specifically described based on the drawings. Fig. 1 shows an outline of an aerial work vehicle, in which 1 is a chassis supported by front wheels 2 and rear wheels 3, and a swivel mount 4, which is a boom support, is mounted on a swivel seat bearing at the upper center of the chassis. 5 so as to be rotatable around a vertical axis. The base of a telescoping boom 8 having a workbench 7 at its tip is rotatably attached to the upper end of the pillar 6 on the rotating frame 4 via a horizontal shaft 9. The boom 8 is rotated by a lift cylinder 10. Rotated in the vertical direction. Further, a counterweight 11 for preventing the overturning moment caused by the boom 8 is attached to the rear side of the rotating frame 4, that is, on the opposite side of the boom extension direction. In addition, the boom 8 can be expanded and contracted and rotated in the vertical direction, as well as the rotating base 4.
The rotation can be controlled on the workbench 7.

Next, the structure of the chassis 1, which is the main part of the present invention, will be explained based on FIGS. 2 and 3. A pair of left and right side members 1 forming the main body of the chassis 1
2 is arranged symmetrically with respect to the vehicle center line and extends parallel to the front-rear direction. Both side members 12
are connected to each other at their front and rear ends by a front axle 13 and a rear axle 14, which are transverse members made of hollow steel plates with a rectangular vertical cross section, and each of the axles 13, 14
A front wheel 2 and a rear wheel 3 are attached to the . Although not shown, the swivel seat bearing 5 placed on the upper center of the side frame 12 is supported by a suitable bracket or a tie beam placed horizontally between the two frames.

Both side members 12 include a hollow member 15 that is made of steel plate and has a hollow shape with a rectangular vertical cross section, thereby ensuring the strength necessary for the chassis 1, and a space 1 of this hollow member 15.
5a, and a heavy member 16 made of a filler such as high specific gravity concrete, waste molding sand, etc. The space 15a of each hollow member 15 has an appropriate number of partitions 17 in the longitudinal direction.
For example, as shown in the figure, it is divided into five small spaces, and these small spaces contain concrete as a heavy member 16 whose specific gravity has been increased as much as possible by mixing iron powder, etc., and waste material. The hole 1 formed in the upper plate of the hollow member 15 is filled with a filler such as foundry sand.
8, the chassis 1 is filled in a fluid state, thereby adding the necessary weight to the chassis 1 to prevent it from tipping over.

That is, in this embodiment, the side member 12 forming the main body of the chassis 1 is configured as described above, and therefore, for example, in the case of a model with a boom length of 12 m, three small spaces are filled with filler. In addition, in the case of a model with a boom length of 14 m, the volume of each small space and the specific gravity of the filler are adjusted so that by filling all five boxes with the filler, a predetermined weight corresponding to the boom length can be obtained. Once this is determined, the weight can be easily adjusted for each model. It should be noted that by adding more small spaces, it is possible to accommodate three or more types of models, but the amount of filling material for weight adjustment can be adjusted even if the partition 17 is omitted.

As detailed above, according to the present invention, by using the filler as a heavy member of the side member that forms the main body of the chassis, costs can be significantly reduced compared to conventional ones. By adjusting the amount of filler, the weight of the chassis can be easily adjusted, and the chassis can be used in common for two or three types of models. Moreover, the strength of the hollow member itself is further strengthened by the filling material, and furthermore, the problems of installation space and wheel turning angle constraints, etc., which are found in conventional weight adding methods, are solved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with Fig. 1 being a schematic side view of the aerial work vehicle, Fig. 2 being a perspective view showing the chassis, which is the main part of the invention, and Fig. 3 being a cross-sectional perspective view of the side member. It is. 1... Chassis, 4... Swivel frame, 7... Workbench, 8... Boom, 12... Side member, 15
...Hollow member, 16...Heavy member.

Claims (1)

[Scope of utility model registration request] A pair of left and right side members extending parallel to each other in the front-rear direction, front and rear axles that interconnect them at the front and rear ends of both side members, and pivoting approximately at the center of the pair of side members. In the aerial work vehicle, the aerial work vehicle is equipped with a swivel frame that can be supported, and a telescoping boom that is extendably installed on the swivel frame and has a work platform at its tip, and the side member is formed by a steel plate to form a vertical cross section. is formed into a rectangular hollow shape, and the space is filled with a material having a high specific gravity as a heavy member, adjusted in accordance with the maximum overturning moment caused by the boom on the rotating frame. Aerial work vehicle.