JPH10101293A - Slide pad device of boom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a smooth slide surface easily formable as such an alignment as copied after a round form (R) angular part of an inner boom can be done freely by adjustments of the rotational position of a retainer and minute movements of a pad. SOLUTION: A pad 4 sliding the round (R) part of an inner boom 2 whose corner is a round form is slidably attached to a slide surface 32 of a plate 31 of a retainer 3 rotatable around a fixing pin 5 in the boom sectional direction, and also attached as being locked to the retainer in the boom longitudinal direction, and the fixing pin of the retainer is locked to an outer boom 1 and also an adjusting means 6 of the retainer is installed. As the adjusting means installed in the outer boom, a combination of those of adjusting bolt 61, a locking nut 7 and plate 11, and an inner surface where the pad slides, is formed into a round form slide surface, or into such a slide surface as combined with a straight line or curve contacted with the inner boom as far as more than two points, and such ones that the pad is held between both sides of the retainer, and being locked in the boom longitudinal direction are all selectable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom slide pad device for a mobile crane.

[0002]

2. Description of the Related Art In the prior art, an apparatus having an adjusting mechanism as shown in FIG. 5 has been used. A in the figure
Is outer boom, b is inner boom, c is bracket,
d indicates a pad, e indicates a mounting pin, f indicates an adjustment bolt, and g indicates a shim. For this adjustment, hold the shim on the bracket, temporarily attach the fixed pad to the outer boom with the mounting pin, find the highest position with the adjustment bolt, fix it, and remove the gap between the inner surface of the pad and the slide surface of the inner boom. Check and, if necessary, replace the amount of shim. When the pad is loosened due to wear of the pad during use, the mounting pin is removed and readjustment is performed each time.

[0003]

However, in the above-mentioned conventional adjustment, the position is not determined only by the adjustment bolt, and the place where the pad does not fit well with the inner boom is adjusted by shim adjustment. Repeated trial-and-error work is performed, which makes assembly work difficult and time-consuming. Further, when the pad is loosened due to abrasion or the like during use, it is necessary to remove the mounting pin each time and perform a re-adjustment operation, and the shim or the pad must be ordered from the manufacturer in some cases.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is a mobile crane having an inner boom having an R-shaped corner. A pad sliding on the R portion is mounted on a retainer rotatable around a mounting pin, and a slide surface of a plate of the retainer and a pad surface are slidably mounted in a cross-sectional direction of the boom. The slide pad device is provided with a retainer mounting pin fixed to the outer boom and a retainer adjusting means.

[0005] By adopting the above configuration, shim adjustment becomes unnecessary, gap size measurement does not require trial and error of disassembly and assembly, and it is easy to adjust the pad to the inner boom using the adjusting means. Becomes Therefore, the adjustment time is greatly reduced, and the elimination of the need for shims reduces the number of parts.Even if the pad is loosened while using a crane truck, the operator can work with only a wrench. Rather than replacing, it is possible to cope with the adjustment work by the adjusting means until it is worn by a certain amount or more.

According to a second aspect of the present invention, a combination of an adjusting bolt, a fixing nut, and a plate is used as adjusting means provided on the outer boom, and the inner surface of the slide pad that slides on the inner boom has an R-shaped sliding surface. Is formed.

[0007] For this reason, the rotation about the mounting pin of the retainer can be easily and steplessly adjusted by the adjustment bolt, so that the slide surface finished in the R shape is moved, and the slide pad is aligned with the inner boom. It is easy.

According to a third aspect of the present invention, the slide pad is fixed in the longitudinal direction so as to be sandwiched between both side surfaces of the retainer, and the inner surface of the slide pad that slides on the inner boom is not R-shaped. , A slide surface formed by combining a straight line or a curve in contact with two or more inner booms.

With this configuration, a simple and reliable structure for fixing the pad in the longitudinal direction of the boom can be obtained, and the R-shape processing of the inner surface of the slide pad is further facilitated.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a side view of the outer boom tip, and FIG. 2 is a sectional view of the outer boom tip. An inner boom 2 in the shape of a square pipe is inserted into an outer boom 1 in the shape of a square pipe, which is slightly larger than the outer boom. Is going. Therefore, inside the outer boom 1, several kinds of slide pad devices that support the load while guiding the outside of the inner boom 2 are arranged, and the inner boom 2 can smoothly move in and out.

There are various types of arrangement of these several types of slide pad devices depending on the cross-sectional shape and size of the inner boom 2, but in general, at the distal end of the outer boom 1, the lower surface side has a function of supporting a load. The lower slide pad 21, the side slide pad 22, and the inclined slide pad 23 are of a fixed type, and on the upper surface side, the contact between the inner slide surface 41 of the pad 4 and the inner boom 2 is checked. An adjustable slide pad device capable of adjusting the mounting position is used.

FIG. 3 is a partial view of the mounting of the slide pad device as an embodiment of the adjustable slide pad device. The cross section of the inner surface of the pad 4 is formed into an R shape according to the cross section of the inner boom 2. It was done. FIG. 4 shows an embodiment in which the cross-sectional shape is formed by two straight lines instead of the R shape of the inner surface of the pad 4.

The function of the adjustable embodiment of FIG. 3 will now be described. The pad 4 is a slide surface 31 of the plate 31 of the retainer 3.
The outer flat surface portion of the inner boom 2 is sandwiched between the inner surface of the pad 4 and the R-shaped corner of the inner boom 2 on which the inner sliding surface 41 of the pad 4 is in contact.

The pad 4 is sandwiched by both side plates of the retainer 3 so as not to move in the longitudinal direction of the boom. However, since the pad 4 is not fixed in the cross-sectional direction of the boom, the fine movement along the slide surface 31 is prevented. Thereby, the structure can be freely adjusted to follow the R-shaped corner of the inner boom 2. However, a combination of the pin 33 and the groove can be provided so that the pin 33 does not easily fall off the pad retainer during assembly. In addition, by providing another pin 33 and a hole formed in the pad as shown in FIG. 4, the pad does not need to fall off from the retainer without being pressed with a finger during assembly.

The retainer 3 is fixed to the outer boom 1 so as to be rotatable about a mounting pin 5, while the outer boom 1 is provided with adjusting bolts 6 as adjusting means 6.
1, the combination of the fixing nut 7 and the plate 11 is mounted, and the adjusting bolt 61 allows the rotational position of the retainer 3 to be positioned in a stepless manner.

Therefore, adjustment of the rotation position of the retainer 3 and
By the fine movement of the pad 4 along the slide surface 31,
Since the inner boom 2 can be freely aligned in accordance with the R-shaped corners, the inner boom 2 and the inner surface of the pad can be properly fitted, and a smooth sliding surface can be easily achieved.

According to the configuration based on the present invention described above,
The operation at the time of the extension / retraction operation of the boom is smoothly performed, and the load can be contributed to the improvement of reliability.

[Brief description of the drawings]

FIG. 1 is a side view of an outer boom tip.

FIG. 2 is a cross-sectional view of the outer boom tip.

FIG. 3 is a mounting partial view of the slide pad device.

FIG. 4 is an example of a sectional view of a shape of a pad surface that slides on an R portion of an inner boom.

FIG. 5 is a partial mounting view of a conventional slide pad device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer boom 2 Inner boom 3 Retainer 32 Slide surface 4 Pad 41 Slide surface 5 Mounting pin 6 Adjusting means 61 Adjustment bolt 11 Plate

Claims (2)

[Claims] In a mobile crane having an inner boom (2) having an R-shaped corner, a pad (4) sliding on an R portion of the inner boom (2) is rotatable around a mounting pin (5). The slide surface (32) of the plate (31) of the retainer (3) and the pad (4) are attached to the retainer (3) so as to be slidable in the cross-sectional direction of the boom.
(3), and the outer tab (1) is provided with a fixing pin (5) for the retainer (3) and an adjusting means (6) for the retainer (3). Boom slide pad device. An adjusting bolt (61) is used as the adjusting means (6), and an inner surface of the pad (4) sliding on the inner boom (2) forms an R-shaped sliding surface (41). The slide pad device according to claim 1.