JPS60242200A - Boom type lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a boom-type lift device that can lift workers, materials, etc. to a high place for construction, repair, repair, etc., and in particular, when the boom body is extended. This invention relates to a boom type lift device that causes less shaking of the working body.

Assembling, repairing, and painting buildings, inspecting street lights, replacing light bulbs, and other work often takes place at heights, it is necessary to insert multiple booms with different diameters, one with a larger one, and one with a smaller diameter. A boom-type wrist device is widely used in which a set of boom bodies are used to raise and lower a work body by extending and contracting the boom body. In this lift device, the boom body is composed of multiple booms with different diameters, so there is a gap between each boom, and two sides of each boom are parallel to the horizontal line. Because of this, when each boom was extended, there was a lot of play. For this reason, if the vehicle body is turned with the boom body fully extended and then suddenly stopped, the play between each boom and the inertial force will interact, causing the boom body to wobble horizontally, causing the operator to The workpiece on top of it shook violently, causing unnecessary anxiety to the workers.

In view of the above-mentioned drawbacks, the present invention provides a boom-type lift device in which the play of each boom is small and the working body is less shaken even when the boom body is turned from side to side.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire structure of this embodiment. I is a pedestal, wheels 2 are pivotally supported on each of the four sides of the pedestal 1, and a swivel base 3 is fixed to the upper center of the pedestal 1. be. A car body 4 housing an engine, a hydraulic system, etc. is mounted on the swivel table 3 so as to be rotatable in the horizontal direction, and a pair of triangular shaft support pieces 5 are fixed to the upper surface of the car body 4. , this shaft support piece 5
The lower end of a lower boom 6, which has an elongated pipe shape with a hollow interior, is inserted between the two. The middle boom 8 is hollow inside from the upper end opening of the lower boom 6.
is slidably inserted thereinto, and an internally hollow upper boom 9 is slidably inserted through the upper end opening of the middle boom 8.
These booms 6, 8, 9 form a three-stage boom body 10. Each boom 6.8.9 has a hollow elliptical cross-sectional shape, and the ellipses are arranged concentrically, with the elongated direction of each ellipse facing upward and downward. . A connecting piece 11 facing slightly upward is fixed to the tip of the upper boom 9, and a rectangular work body 12 on which a worker rides is connected to this connecting piece 11 by a bin 13. A correction hydraulic cylinder 14 for correcting the posture is interposed between the work body 11 and the work body 12, and a control box 15 is fixed to the upper part of the work body 12. Further, a lifting hydraulic cylinder 6 is interposed between the upper part of the vehicle body 4 and the lower boom 6.

FIG. 2 shows a cross section of the boom body 10 taken along the line X-X in FIG. 1, and each boom 6.8.9 has an oval cross section with a different diameter. 8.9
A small gap is provided between them, and the axes of the cross sections of each boom 6.8.9 are aligned.

Hydraulic cylinders 17 are arranged in a cavity in the boom 9 so as to be aligned in the length direction, and on the downwardly facing side of the boom 9, the hydraulic cylinders 17 overflow in the length direction and are bent slightly inward into a four-part shape. A space for a chain storage section 18 is formed, and a chain 19 is inserted into this chain storage section 18. The boom 6.8.9 is positioned vertically in the long direction of the ellipse.

Further, FIG. 3 shows a longitudinal section of the boom body 10 taken along the arrow X-X in FIG. The base of the cylinder 170 is fixed. This hydraulic cylinder 1
A joint 22 is fixed to the cylinder rod 21 of No. 7 in a direction perpendicular to its axis, and an elongated rod 23 is connected to the joint 22 so as to be parallel to the hydraulic cylinder 17. is connected to the base of the middle boom 80 via the block 24.

Both ends of a chain 190 are connected between the base of the upper boom 9 and the top of the lower boom 6, and this chain 19 can be wound around a roller 25 that is pivotally supported at the lower end of the middle boom 8. be.

In addition, on the inner walls of the tips of the lower boom 6 and the middle boom 8,
Middle boom 8. A slider 26 made of MC nylon or the like that slides in contact with the outer peripheral wall of the upper boom 9.
27 is fixed, and the middle boom 8. Sliders 28 and 29 are fixed to the outer periphery of the base of the upper boom 9, respectively, and slide in contact with the inner peripheral walls of the lower boom 6 and the middle boom 9.

Next, the operation of this embodiment will be explained.

The engine in the vehicle body 4 is operated, a hydraulic pressure generating device (not shown) is driven by the engine to supply hydraulic pressure to each part of the lift device, and the lift device is operated freely by operating a lever or the like in the control box 15. become. That is, by a worker riding on the work body 12 and operating the control box 15, the gantry 1 can move forward and backward in the direction A, and the vehicle body 4 can rotate left and right in the direction B on the swivel base 3. The lower boom 6 is operated by a hydraulic cylinder 16.
The middle and upper booms 8 and 9 can be extended and contracted in the D direction by a hydraulic cylinder 17, and the work body 12 is corrected and swung in the E direction by a correction hydraulic cylinder 14 so that it is always vertical. In other words, the vehicle body 4 rotates the wheels 2 and
can be moved to a predetermined working position, and then the vehicle body 4 can be rotated on the swivel base 3 to orient the work body 12 in the required direction. Then, by extending the hydraulic cylinder 16, the lower boom 6 is lifted to the required inclination angle, and the middle and upper booms 8, 9 are extended from the lower boom 6 by the hydraulic cylinder 17, so that the work body 12 can be moved to the wall surface or the underside of the overpass. It is possible to approach the height of the work area such as
Can perform work such as modification and removal. Note that the work body 12 is corrected by the action of the correction hydraulic cylinder 14 and is always held in the vertical direction.

The middle and upper booms 8 and 9 in this boom body are extended and contracted by a hydraulic cylinder 17.
7 expands, the force acting on the cylinder condo 210 becomes the joint 22. Rod 23. This is transmitted to the middle boom 8 via the block 24, and the middle boom 8 is extended from the lower boom 6.

At the same time, the rollers 25 pull up the chain 19 due to the extension of the middle poop 8, which acts to stretch the upper boom 9 from the middle poop 8, and the middle and upper booms 8 and 9 are simultaneously extended by the lower boom 6.

During the expansion and contraction of the boom body 10, each boom 6.8.9 is slid by the sliders 26 to 29, respectively.

This boom body 10 has an elliptical cross section as shown in FIG. 2, and the ellipse direction is located in the vertical direction of each boom, so when the boom body 10 is extended,
The gravity of the upper boom 90 is concentrated on a narrow, slightly U-shaped portion at the top of the ellipse. Therefore, the sliders 28.29 located at the upper apex of the booms 8, 9 are in close contact with the narrow inner circumferential wall of the ellipse formed by the upper ellipse of the boom 6.8, and also by the ellipse below the boom 8. The narrow outer peripheral wall of the oval fits tightly against the slider 26.27 at the lower apex of the boom 6.8, and the vertical play between each boom 6.8.9 is absorbed. Therefore, if the vehicle body 4 is turned horizontally and suddenly stopped with each boom 6.8.9 extended, the work body 12 connected to the tip of the boom body 10 will not bend, but each boom 6.8 Since there is no play in the gap between . can be stopped quietly.

Since the present invention is constructed as described above, the play between the booms constituting the boom body is absorbed and no wobbling occurs, so vibrations are not transmitted to the work body even during work, and the worker can feel at ease. It allows you to work without causing unnecessary anxiety.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a cross-sectional view of the boom body taken along the line XX in FIG. 2, and FIG. 3 is a side sectional view of the boom body taken along the line XX in FIG. 4...Car body 6,8.9...Boom 10...Boom body 12...Working body Patent applicant Hikoma Seisakusho Co., Ltd. Representative Patent Attorney Akira Hibi Tsune

Claims (1)

[Claims] A vehicle body that is movable and can pivot horizontally, a boom body in which multiple booms are extendably inserted in the longitudinal direction, and the base of the large diameter boom is pivotally supported on the vehicle body, and the boom. It consists of a working body connected to the tip of a boom with a small diameter, and the working body can be positioned at any height by extending and contracting the boom in the length direction and swinging the boom up and down. A boom-type wrist device that can be used for a boom-type lift device, characterized in that each boom of the boom body has an elliptical cross-section, and the elongated ellipse of the boom is positioned in the vertical direction. .