JPH0812272A - Telescopic box supporting device - Google Patents

Abstract

PURPOSE:To facilitate the assembly of a telescopic box, in which an inner box is fitted in an outer box freely to be telescoped and which is provided with a supporting device for supporting the lower surface of an inner box under an outer box. CONSTITUTION:This supporting device of a telescopic box to be used for an outrigger and a telescopic boom of a moving crane has an eccentric bearing 15 and a stopper 19. In the case where the eccentric bearing 15 is turned so as to adjust a clearance between an outer box 1 and an inner box 2 at L, turning stop position of the eccentric bearing 15 is decided so that the outer surfaces 17 or the corner parts 18 of a flange 16 of the eccentric bearing 15 are regulated by a stopper 19. For example, in the case where turning of the eccentric bearing 15 is regulated at the outer surface 17 of the flange 16, a groove of the stopper 19 is fitted in the double surface width F of the flange 16, and a bolt 23 is inserted into a bolt hole 22, and screwed with a screw hole 24 so as to fix the stopper 19, and the turning of the eccentric bearing 15 is regulated by this stopper 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for an expandable box, which is provided with a support device for elastically inserting the inner box into the outer box and supporting the lower surface of the inner box at the lower part of the outer box. .

[0002]

2. Description of the Related Art Conventionally, a support device for an expandable box of this type is mainly used for working machines (for example, mobile cranes, aerial work vehicles,
It is used for outriggers and telescopic booms of digging pillar cars. Hereinafter, an example of a conventional technique implemented in the outrigger of a mobile crane will be shown and described with reference to FIGS. In the mobile crane, four sets of outriggers A as shown in FIG. 6 are arranged in front, rear, left and right. The outrigger A includes an outer box 1 attached to a vehicle, an inner box 2 that is telescopically fitted in the outer box 1, and a jack 3 having a support plate 4 at the tip of the inner box 2. I am configuring. Before the crane work, the inner box 2 is extended from the outer box 1, and then the support plate 4 is installed on the ground by the jack 3 so that the vehicle is supported on the ground and then the crane work is performed.

Such an outrigger A is provided with a support device B for supporting the lower surface of the inner box on the lower part of the outer box. This support device B has an outer shaft 5 as shown in FIGS.
The bearing 6 is provided inside, and the axis C of the outer shaft 5 and the axis D of the bearing 6 are E.
And a pair of eccentric bearings 7 that are eccentrically eccentric and have outer shafts 5 rotatably fitted and attached to lower positions on both sides of the outer box 1, and a pair of eccentric bearings 7 that are horizontally mounted between the bearings. It is composed of a shaft 8 and a roller 9 rotatably attached to the shaft 8 and supporting the lower surface of the inner box 2. By rotating the eccentric bearing 7, a gap L between the outer box 1 and the inner box 2 is formed. Is adjustable.

In other words, the support device B has an inner box 2 rather than an outer box 1.
Has a function of reducing frictional resistance when expanding or contracting, and a function of adjusting a gap between the outer case 1 and the inner case 2.
The rotation of the eccentric bearing 7 is regulated by providing a flange 11 having a notch 10 on its outer periphery on one side of the eccentric bearing 7 as shown in FIG. After the gap L between the box 1 and the inner box 2 is adjusted, a stopper 12 is brought into contact with the notch 10 as shown in FIG.

[0005]

However, the supporting device B has the following problems. That is, outer box 1
Since a manufacturing error occurs in manufacturing the inner dimension of the inner box 2 and the outer dimension of the inner box 2, the clearance is adjusted by rotating the eccentric bearing 7 in order to make the clearance L between the outer box 1 and the inner box 2 constant. Is what you are doing. Therefore, the position of the stopper 12 to be attached to the outer case 1 cannot be determined until after the inner case 2 is incorporated into the outer case 1 and the eccentric bearing 7 is rotated to adjust the clearance.
The stopper 12 adopts a fastening method such as welding by matching the actual product, which requires a lot of man-hours when assembling the outrigger A. Moreover, if the gap adjustment is to be redone, the stopper 12 is not always located at the same position, and therefore the welded portion needs to be removed, which is a very troublesome work. Further, when the inner box 2 is replaced or the inner box 2 is once removed from the outer box 1, it is necessary to redo the gap adjustment, which is also a troublesome work. An object of the present invention is to provide a support device for a telescopic box that solves the above problems.

[0006]

In order to achieve the above-mentioned object, a support device for an expandable box according to the present invention is configured such that an inner box is telescopically inserted into an outer box and a lower surface of the inner box is supported at a lower part of the outer box. A support device for a telescopic box having a support device for rotating the outer shaft and a bearing in the outer shaft to eccentric the outer shaft and each axis of the bearing to rotate the outer shaft to a lower position on both sides of the outer container. A pair of eccentric bearings that are movably fitted and mounted, a shaft horizontally mounted between the bearings of the pair of eccentric bearings, and a roller that is rotatably mounted on the shaft and supports the lower surface of the inner box. In a support device for an expandable box in which the gap between the outer box and the inner box can be adjusted by rotating the eccentric bearing, the center of the eccentric bearing is located on one side of the eccentric bearing. A polygonal flange that is concentric with the axis of the outer shaft is provided, and the flange is brought into contact with the outer surface of the polygon or the corner of the polygon. It is obtained by constituting the stopper for restricting the rotation of the eccentric bearing mounted on the box.

[0007]

With the support device for the expandable box of the present invention constructed as described above, the outer surface of the polygon or the corner of the polygon is utilized, and the stopper is brought into contact with the support to restrict the rotation of the eccentric bearing. Therefore, the gap can be changed and adjusted by the number of polygon outer surfaces or polygon corners. Moreover, since the axis of the outer shaft of the eccentric bearing and the center of the polygon are concentric with each other, even if the eccentric bearing is rotated, one of the outer surfaces or corners of the polygon always contacts the stopper. It is possible to predetermine the mounting position of the stopper so that Therefore, since the mounting position of the stopper can be determined and assembled in advance, it is possible to reduce the number of steps for assembling the telescopic box. Even if the clearance adjustment is performed again, the rotation of the eccentric bearing can be regulated at the same position regardless of the rotation of the eccentric bearing. Since it is not known where the stopper is located, it is possible to eliminate the need to fix the stopper to the outer box by actual matching such as welding.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A support device H for an expandable box according to the present invention will be described below with reference to FIGS. 1 to 5 are different from those illustrated in FIGS. 6 to 8 and described in the related art only in the flange and the stopper of the eccentric bearing, and other than this part The same reference numerals as those described in the related art will be used below, and description thereof will be omitted.

Reference numeral 15 denotes an eccentric bearing, which is different from the eccentric bearing described in the prior art only in the flange, as shown in FIG. Reference numeral 16 denotes a flange, which has a hexagonal shape on one side of the eccentric bearing 15 with its center being concentric with the axis C of the outer shaft 5 of the eccentric bearing 15. This 6
The square flange 16 has six outer surfaces 17 and six corners 1.
Eight. As shown in FIG. 2, reference numeral 19 denotes a stopper, which has a groove 20 and is formed in a U-shaped cross section. The groove width F ′ is the width across flats of the hexagonal flange 16 (opposite outer surface). It corresponds to the width between 17) The width that F can be inserted is determined. In addition, the concave portion 2 is formed on the two opposite side surfaces of the groove 20.
The width G ′ between the recesses 21 and the width dimension of the recesses 21 are determined so that the opposite corners 18 of the hexagonal flange 16 can be fitted into the recesses 21. In this embodiment, the concave portion 21 has a U-shape as shown in FIG. 2A, but it may have a shape in which the corner portion 18 can be inserted into the concave portion 21, for example, V It may have a letter shape.
Reference numeral 22 is a bolt hole for attaching the stopper 19 to the outer box 1 with a bolt 23, and 24 is a bolt hole for attaching the stopper 19 to the outer box 1.
3 is a screw hole to be attached to the outer box 1. The screw hole 24 has a stopper 19 on the outer surface 17 or the corner 18 of the flange 16.
The mounting position of the stopper 19 to the outer box 1 so that it can be brought into contact with the groove width F ′ or the concave portion 21 is determined and provided.

As described above, the support device for the telescopic box of the present invention is
Since the eccentric bearing 15 and the stopper 19 are configured, they operate as follows. That is, the eccentric bearing 15
Is rotated to adjust the gap between the outer box 1 and the inner box 2 to L. Then, as shown in FIG. 3, when the clearance between the outer case 1 and the inner case 2 is adjusted to L, the eccentric bearing is positioned so that the outer surface 17 or the corner 18 of the flange 16 can be rotationally restricted by the stopper 19. The rotation stop position of 15 is determined. When rotation is restricted by the outer surface 17 of the flange 16 ((a) of FIG. 3), the two surface widths of the flange 16 (corresponding to the width between the opposing outer surfaces 17) F
The groove 20 of the stopper 19 is fitted in the stopper 19, the bolt 23 is inserted into the bolt hole 22, the bolt 23 is screwed into the screw hole 24, and the stopper 19 is fixed to the outer box 1.
The rotation of the eccentric bearing 15 is restricted by 9. Also, the flange 1
When the rotation is restricted by the corner portion 18 of 6 ((b) of FIG. 3),
The recesses 21 are fitted into the opposite corners 18 of the flange 16, and the bolts 23 are inserted into the bolt holes 22 to form the screw holes 24.
A bolt 23 is screwed in to fix the stopper 19 to the outer box 1, and the stopper 19 restricts the rotation of the eccentric bearing 15.

In this way, the support device for the telescopic box of the present invention is
Since the rotation of the eccentric bearing 15 is regulated by utilizing the prismatic outer surface 17 or the hexagonal corner portion 18 and contacting the stopper 19 there, the hexagonal outer surface 17 or the hexagonal corner portion 18 is prevented. The gap can be changed and adjusted by the number of the corner portions 18. (In the above embodiment, the outer surface 17 and the corner portion 1
It is possible to adjust by changing 7 types of gaps including the number of 8. Further, since the center of the hexagon and the axis C of the outer shaft 5 of the eccentric bearing 15 are concentric with each other, even if the eccentric bearing 15 is rotated, one of the hexagonal outer surfaces 17 or corners 18 is always present. The attachment position of the stopper 19 can be determined in advance so that the stopper 19 can be brought into contact with the stopper 19. Therefore, since the mounting position of the stopper 19 can be determined in advance and assembled, the man-hours for assembling the telescopic box can be eliminated. Further, even if the clearance adjustment is performed again, the rotation of the eccentric bearing 15 can be regulated at the same position of the stopper 19 regardless of the rotation of the eccentric bearing 15, as in the conventional technique. Since it is not known where the position of the stopper 19 is, the stopper 19 can be adjusted by welding the actual product.
You can eliminate what you said you had to fasten to the outer box.

The eccentric bearings 15 are arranged in a pair on the left and right sides, but it is not always necessary to match the rotational positions of the left and right eccentric bearings 15. That is, when the clearance between the inner box 2 and the outer box 1 is not uniform on the left and right, the rotational positions of the left and right eccentric bearings 15 may be individually determined and adjusted so that the left and right clearances are uniform.

In the above embodiment, since the eccentric bearing 15 has a purpose function of preventing the eccentric bearing 15 from coming off from the outer casing 1, the stopper 19 has a U-shaped cross section. As shown in the figure, one outer surface 17 or the corner portion 18 of the flange 16 may be brought into contact with the stopper 25 having the outer surface 26 and the groove 27 to restrict the rotation of the eccentric bearing 15. In this case, the shaft 8 is projected outward from the eccentric bearing 15 as shown in FIG.
It is necessary to provide 6 and tighten them from both sides with nuts 27 so as to prevent the eccentric bearing 15 from coming out of the outer casing 1.

Also in this case, the hexagonal opposed outer surfaces 17
Apply a wrench to the eccentric bearing 15 to rotate the eccentric bearing 15 to adjust the gap between the outer box 1 and the inner box 2 to L, and while the eccentric bearing 15 is kept rotating with the wrench, place the stopper 25 on the outer box 1. Can be installed. And if necessary, the stopper 25 should be attached to the outer box 1.
It is also possible to restrict the rotation of the eccentric bearing 15 at two places by further adding to the above.

Further, in the above embodiment, the shaft 8 is attached to the eccentric bearing 1.
5, the screw portions 26 are provided at both ends thereof and tightened with nuts 27 from both sides so as to prevent the eccentric bearing 15 from coming out of the outer casing 1.
The shaft 8 may be inserted into the shaft 5, and split pins may be inserted into both ends of the protruding shaft 8 to prevent the eccentric bearing 15 from coming out of the outer casing 1.

Next, although the hexagonal flange 16 has been described in the above embodiment, an octagonal, pentagonal, quadrilateral, or even polygonal shape may be used, and if the number of polygons is large, fine clearance adjustment is possible. It is possible. When fine adjustment of the gap is not required so much, the stopper does not have to correspond to either the outer surface 17 or the corner portion 18 on the stopper side, and may correspond to only one of them.

[0017]

According to the support device for the telescopic box of the present invention configured and operated as described above, the gap can be adjusted by changing the gap by the number of polygonal outer surfaces or polygonal corners. In addition, even if the eccentric bearing is rotated, any of the polygonal outer surfaces or corners can always come into contact with the stopper, and the stopper mounting position can be determined in advance. Therefore, it is possible to reduce the number of steps for assembling the telescopic box. Further, even if the clearance adjustment is performed again, the rotation of the eccentric bearing can be restricted at the same position of the stopper regardless of the rotation of the eccentric bearing.

[Brief description of drawings]

FIG. 1 is an explanatory view of an eccentric bearing, (a) is a front view of the eccentric bearing, and (b) is a sectional view taken along line XX of (a).

2A and 2B are explanatory views of a stopper, FIG. 2A is a plan view of the stopper, and FIG. 2B is a sectional view taken along line YY of FIG.

3A and 3B are explanatory views illustrating a support device for an expandable box of the present invention, FIG. 3A is a state diagram in which a groove of a stopper is brought into contact with an outer surface of an eccentric bearing, and FIG. FIG. 6 is a view showing a state where a recess of a stopper is brought into contact with a corner of an eccentric bearing.

FIG. 4 is an explanatory view of another stopper, in which (a) is
It is a top view of a stopper, (b) is a side view of (a) stopper.

FIG. 5 is an explanatory view for explaining the support device for the expandable box of the present invention, in which (a) is an explanatory view for explaining another embodiment,
(B) is a VV sectional view of (a).

FIG. 6 is an explanatory diagram illustrating a conventional support device for a telescopic box and is an explanatory diagram illustrating an outrigger portion.

7 is a cross-sectional view taken along the line ZZ of FIG. 6 and is an explanatory diagram illustrating a supporting device portion.

FIG. 8 is an explanatory diagram illustrating a conventional eccentric bearing,
(A) is a front view of an eccentric bearing, (b) is W of (a).
It is a -W sectional view.

[Explanation of symbols]

 1 Outer box 2 Inner box 5 Outer shaft 6 Bearing 8 Shaft 15 Eccentric bearing 16 Flange 19 Stopper 25 Stopper H Support device

Claims (1)

[Claims] 1. A support device for an expandable box, comprising: a support device for inserting and retracting an inner box in an outer box and supporting a lower surface of the inner box at a lower portion of the outer box, wherein the support device is an external device. A pair of eccentric bearings in which a bearing is provided in the shaft and the outer shaft and the respective shaft cores of the bearing are eccentric, and the outer shaft is rotatably fitted and inserted into lower positions on both sides of the outer box, and the pair of eccentric bearings. A shaft horizontally mounted between the bearings,
In a support device for an expandable box, which is composed of a roller rotatably attached to this shaft and supports the lower surface of the inner box, and by which the eccentric bearing can be rotated to adjust the gap between the outer box and the inner box, The eccentric bearing is provided on one side with a polygonal flange whose center is concentric with the axis of the outer shaft of the eccentric bearing, and is brought into contact with the outer surface of the polygon or a corner of the polygon. A support device for a telescopic box, characterized in that a stopper for restricting rotation of the eccentric bearing is attached to the outer box.