JP3405443B2 - Mounting structure of the sliding member of the telescopic boom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer boom in which an inner boom is inserted and a sliding member is interposed between an inner surface of the outer boom and an outer surface of the inner boom. The present invention relates to a mounting structure for a sliding member of a telescopic boom, such as a crane, which is installed and slidably expanded and contracted. 2. Description of the Related Art Conventionally, a telescopic boom in which an inner boom is fitted into an outer boom, and a sliding member is interposed between an inner surface of the outer boom and an outer surface of the inner boom to slide and extend. As an attachment structure for attaching a sliding member, FIG.
As shown in FIG. 16, a mounting hole 29 for the sliding member 23 is formed in the side plate of the outer boom 1, and the sliding member 23 with the flange 24 is inserted into the mounting hole 29, and the outer boom 1 and the flange 24 are There is a device in which a shim 27 is interposed therebetween and tightened with a bolt 28. However, in this structure, it is necessary to provide tap holes 26 for a plurality of bolts 28 for one sliding member 23 on the side plate of the outer boom 1, which increases the cost of processing the tap holes 26. Further, when mounting the sliding member 23, a plurality of bolts 28 must be alternately tightened so as not to cause a one-sided tightening. When adjusting the gap between the sliding member 23 and the inner boom 2 with the shim 27, Since it is necessary to repeatedly attach and remove the bolt 28, the operation is troublesome. Accordingly, as shown in FIGS. 17 to 19, the sliding member 33 is slidably brought into contact with the outer surface of the inner boom 2 by sliding the sliding plate 33.
4 and a mounting shaft 35 projecting from the outer surface of the sliding plate 34 and having a bolt hole 36 provided therein. The mounting shaft 35 of the sliding member 33 is provided on a side plate of the outer boom 1. The sliding plate 3 is inserted into the mounting hole 39 of the member 33 from the inside of the outer boom 1.
A U-shaped shim 37 is interposed between the outer surface of the outer boom 1 and the inner surface of the outer boom 1, and a bolt 38 with a flange is screwed into the bolt hole 36 of the mounting shaft 35 from the outside of the outer boom 1. A mounting structure for a sliding member of a telescopic boom has been proposed (see Japanese Utility Model Laid-Open No. 5-64188). In this mounting structure of the sliding member, it is only necessary to machine the mounting hole 39 in the side plate of the outer boom 1 and FIG.
16, it is not necessary to provide the tapped holes 26 for the plurality of bolts 28, and the sliding member 33 is not necessary.
When the gap between the inner boom 2 and the inner boom 2 is adjusted by the shim 37, it is not necessary to repeat the mounting and removing of the plurality of bolts 28. However, in this mounting structure of the sliding member,
Since the sliding member 33 is inserted into the mounting hole 39 from the inside of the outer boom 1, it is necessary to disassemble the boom to replace the sliding member 33, which requires time and costs for replacement. . In addition, in this structure, the shim 37 is U-shaped and one of the shims 37 is open, so that it is easy to fall off. If even one shim 37 falls off, the other shims 37 also fall off. Then
The play of the sliding member 33 becomes large in the lateral direction, and the predetermined gap between the sliding member 33 and the inner boom 2 cannot be maintained, so that the function cannot be performed. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the mounting structure of the sliding member of the telescopic boom, and slides from the outside of the side plate of the outer boom without disassembling the boom. It is possible to attach the members, it is easy to attach the sliding members and adjust the shim, and it is possible to prevent the shim from falling off, and to make the sliding members of the telescopic boom that does not cause backlash in the sliding members. It is intended to provide a mounting structure. According to the present invention, in order to solve the above problems, an inner boom is inserted into an outer boom, and a sliding member is provided between an inner surface of the outer boom and an outer surface of the inner boom. In the telescopic boom that slides and expands and contracts by interposing a sliding member, the sliding member is composed of a sliding plate that slides in contact with the outer surface of the inner boom and a mounting shaft that protrudes from the outer surface of the sliding plate and has a bolt hole. do it,
A shim provided with a shaft hole through which the mounting shaft passes is mounted on the outer surface of the sliding plate, and the sliding member is inserted into a mounting hole formed in a side plate of the outer boom from the outside of the outer boom. The slide plate is inserted into the mounting hole with the shaft displaced to the escape preventing position inside the outer boom, and the flanged bolt is screwed into the bolt hole of the mounting shaft from outside the outer boom. The moving member is attached. When mounting the sliding member, the sliding plate is inserted into the mounting hole from the outside of the outer boom, and the sliding plate is displaced to the escape preventing position inside the outer boom, and the slide plate stopper is mounted. All that is required is to fit into the mounting hole and screw one bolt with flange into the bolt hole of the mounting shaft. Therefore, the sliding member can be attached from the outside of the side plate of the outer boom without disassembling the boom, and the attaching operation of the sliding member and the adjusting operation of the shim are easy. Further, since the shim is mounted on the sliding plate with the mounting shaft penetrating the shaft hole, the shim is prevented from falling off, and the sliding member does not rattle. FIG. 1 is a front view of a telescopic boom having a sliding member mounting structure according to an embodiment of the present invention. FIG. 2 is a front view of a sliding member mounting portion. 3 is a sectional view taken along line AA of FIG. 2, FIG. 4 is a front view of the sliding plate, FIG. 5 is a sectional view taken along line BB of FIG. 4, FIG. 6 is a front view of the shim, and FIG. FIG. 8 is a front view of the stopper, FIG. 8 is a cross-sectional view taken along line CC of FIG. 7, FIGS. 9 to 11 are explanatory views of a procedure for mounting the sliding member, FIG. 12 is a cross-sectional view taken along line EE of FIG. Is a sectional view taken along line FF of FIG. 10, and FIG. 14 is a sectional view taken along line GG of FIG. The telescopic boom SB shown in FIG.
In the middle boom MB, the tip boom T in the middle boom MB
B is a three-stage boom fitted. Here, in the relationship between the base boom BB and the middle boom MB, the base boom BB is the outer boom 1 and the middle boom MB is the inner boom 2;
In the relationship between the intermediate boom MB and the distal boom TB, the intermediate boom MB is the outer boom 1 and the distal boom TB is the inner boom 2. The sliding member mounting portions P set up and down on the distal end side of the proximal end boom BB and the distal end side of the intermediate boom MB are provided between the inner side surface of the proximal end boom BB and the outer side surface of the intermediate boom MB, and the intermediate boom. Sliding members 3 are interposed between the inner surface of the MB and the outer surface of the tip boom TB, respectively.
They are held at a predetermined interval and slide and expand and contract. The sliding member 3 comprises a rectangular sliding plate 4 which is in sliding contact with the outer surface of the inner boom 2 and a mounting shaft 5 having a substantially square cross section protruding from the outer surface of the sliding plate 4. Yes,
The mounting shaft 5 is provided with a bolt hole 6. A shim 7 is mounted on the outer surface of the sliding plate 4. The shim 7 is a rectangular hole having the same outer shape as the sliding plate 4 and the mounting shaft 5 penetrating therethrough.
It has. The side plate of the outer boom 1 is provided with a rectangular mounting hole 9 into which the sliding plate 4 can be inserted. The sliding plate 4 is
Since it is rectangular, it is inserted into the mounting hole 9 from the outside of the outer boom 1 as shown in FIG. 9 and rotated 90 degrees as shown in FIG. 10, so that escape from the mounting hole 9 is prevented. As described above, the slide plate stopper 10 is fitted in the mounting hole 9 with the slide plate 4 being displaced to the escape preventing position. The slide plate stopper 10 has an outer shape of the mounting hole 9.
The sliding plate has a notch 11 for attachment and detachment on the left and right sides, and a square fitting hole 12 for fitting the mounting shaft 5 of the sliding member 3 in the center. Slip stopper 1
0 prevents the sliding plate 4 from rotating from the escape preventing position and returning to the escapeable state. A bolt 13 with a flange is screwed into the bolt hole 6 of the mounting shaft 5 from the outside of the outer boom 1, and a flange portion 14 of the bolt 13 with a flange comes into contact with the outer surface of the outer boom 1, and a sliding member is provided. 3 is fixed to the outer boom 1. When mounting the sliding member 3, an appropriate number of shims 7 are mounted on the outer surface of the sliding plate 4 as shown in FIG.
The sliding plate 4 is inserted into the mounting hole 9 from outside the outer boom 1,
As shown in FIG. 10, the sliding plate 4 is rotated by 90 degrees inside the outer boom 1 to be displaced to the escape preventing position, the slide plate stopper 10 is fitted into the mounting hole 9, and the bolt of the mounting shaft 5 is bolted. 1 in hole 6
It is only necessary to screw in the bolts 13 with flanges. When the sliding member 3 is removed, the procedure is reversed. Accordingly, the sliding member 3 can be attached from outside the side plate of the outer boom 1 without disassembling the boom.
The work of attaching the sliding member 3 and the work of adjusting the shim 7 are easy. Also, since the shim 7 is mounted on the sliding plate 4 with the mounting shaft 5 penetrating through the shaft hole 8, the shim 7 is prevented from falling off, and the sliding member 3 does not rattle. The sliding plate 4 may have a shape other than a rectangle as long as it can be displaced to the escape preventing position after insertion. The cross-sectional shape of the mounting shaft 5 can be variously selected. As described above, according to the mounting structure of the sliding member of the telescopic boom of the present invention, the sliding member can be mounted from the outside of the side plate of the outer boom without disassembling the boom. Thus, the work of attaching the sliding member and adjusting the shim becomes easy. Further, the shim can be prevented from falling off, and the sliding member does not rattle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a telescopic boom provided with a sliding member mounting structure according to an embodiment of the present invention. FIG. 2 is a front view of a sliding member mounting portion. FIG. 3 is a sectional view taken along line AA of FIG. 2; FIG. 4 is a front view of a sliding plate. FIG. 5 is a sectional view taken along line BB of FIG. 4; FIG. 6 is a front view of the shim. FIG. 7 is a front view of a sliding plate stopper. FIG. 8 is a sectional view taken along line CC of FIG. 7; FIG. 9 is an explanatory diagram of a procedure for attaching a sliding member. FIG. 10 is an explanatory diagram of a procedure for attaching a sliding member. FIG. 11 is an explanatory diagram of a procedure for attaching a sliding member. FIG. 12 is a sectional view taken along line EE of FIG. 9; FIG. 13 is a sectional view taken along line FF of FIG. 10; FIG. 14 is a sectional view taken along line GG of FIG. 11; FIG. 15 is an explanatory diagram of a conventional sliding member mounting structure. 16 is a sectional view taken along line HH of FIG. FIG. 17 is an explanatory diagram of a conventional sliding member mounting structure. 18 is a sectional view taken along line II of FIG. 17; FIG. 19 is an explanatory view of attaching a conventional sliding member. [Description of Signs] 1 Outer boom 2 Inner boom 3 Sliding member 4 Sliding plate 5 Mounting shaft 6 Bolt hole 7 Shim 8 Shaft hole 9 Mounting hole 10 Sliding plate slip stopper 11 Notch 12 Fitting hole 13 Bolt with flange 14 Flange

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 1/00-23/94 B66F 9/00-11/04

Claims (1)

(57) [Claims 1] An inner boom is inserted into an outer boom, and a sliding member is interposed between an inner surface of the outer boom and an outer surface of the inner boom to slide and extend. In the telescopic boom, the sliding member is configured by a sliding plate that slides in contact with the outer surface of the inner boom and a mounting shaft that is provided on the outer surface of the sliding plate and provided with a bolt hole,
A shim provided with a shaft hole through which the mounting shaft passes is mounted on the outer surface of the sliding plate, and the sliding member is inserted into a mounting hole formed in a side plate of the outer boom from the outside of the outer boom. The sliding plate is inserted into the mounting hole with the is displaced to the escape prevention position inside the outer boom, and a bolt with flange is screwed into the bolt hole of the mounting shaft from the outside of the outer boom. Mounting structure for boom sliding members.