JPH0564188U - Mounting structure for sliding member of telescopic boom - Google Patents

Abstract

(57) [Summary] [Purpose] The sliding member of the telescopic boom can be securely fixed, and the installation and adjustment work can be performed easily. [Structure] In a telescopic boom in which an inner boom 7 is fitted and inserted in an outer boom 1 and a sliding member 20 is interposed between the outer boom 1 and the inner boom 7, the sliding member 20 is replaced by an inner boom 7. The sliding plate 21 is in sliding contact with the sliding plate 21, and the mounting shaft 22 is provided on the rear surface of the sliding plate 21 so as to project from the rear surface of the sliding plate 21. The mounting shaft 22 is slid on the side surface of the outer boom 1. It is inserted into the mounting hole 24 of the member 20, and the flanged bolt 26 is screwed into the bolt hole 23 of the mounting shaft 22 from the outside of the outer boom.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a sliding member for a telescopic boom, such as a crane, in which the inner boom is fitted and inserted into the outer boom, and a sliding member is provided between the inner surface of the outer boom and the outer surface of the inner boom to slide and extend. Regarding mounting structure.

[0002]

[Prior Art]

 Conventionally, the telescopic boom that inserts the inner boom into the outer boom and slides between the inner surface of the outer boom and the outer surface of the inner boom to expand and contract has a sliding member mounting structure. As shown in FIGS. 6 and 7, a mounting hole 3 for the sliding member 2 is bored in the side surface of the outer boom 1, and the sliding member 2 with a flange 4 is inserted into the mounting hole 3 so that the outer boom 1 A shim 5 is interposed between the flange 4 and the flange 4, and the bolt 6 is tightened, or, as shown in FIG. 8, there is a sliding contact surface on one side for sliding contact with the outer surface of the side plate of the inner boom 7. A slide tool body 10 including a plate portion 8 having a seating surface on the other side and a shaft portion 9 erected on the seating surface of the plate portion 8, and a shaft portion of the slide tool body 10 formed in a side plate of the outer boom 1. 9 is received and the plate portion 8 of the slide tool body 10 is fixed to the inside of the outer boom 1 side plate. A positioning hole 11 for allowing the shaft portion 9 to be received by the positioning hole 11, a plurality of shims 12 provided on the seat surface of the slide tool body 10 and the inner surface of the outer boom 1 side plate, and a shim retaining stopper. There is one using a slide device composed of 13 and 13 (see Japanese Utility Model Application Laid-Open No. 2-49984).

[0003]

[Problems to be solved by the device]

 However, in the structure shown in FIG. 6, it is necessary to provide tap holes 16 for a plurality of bolts 6 for each sliding member 2 on the side surface of the outer boom 1, which increases the cost of processing the tap holes 16. In addition, when the sliding member 2 is attached, the plurality of bolts 6 must be alternately tightened so as to prevent partial tightening, and the mounting is troublesome. On the other hand, in the structure of FIG. 8, the sliding tool body 10 has its shaft portion 9 received in the localization hole 11 and is sandwiched between the outer boom 1 and the inner boom 7. Since it is movable, when the sliding contact surface of the slide tool body 10 becomes worn due to use, the slide tool body 10 moves to disengage the shim 12 or the sliding contact surface of the plate part 8 is unidirectionally contacted with the boom. It will adversely affect the expansion and contraction of.

The present invention is to solve the above-mentioned problems in the mounting structure of the sliding member of the telescopic boom, and the work for adjusting the mounting of the sliding member is easy and can be surely fixed. An object is to provide a mounting structure for a sliding member.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is a telescopic boom in which an inner boom is fitted into an outer boom, and a sliding member is provided between the inner surface of the outer boom and the outer surface of the inner boom to allow the telescopic boom to expand and contract. , The sliding member consists of a sliding plate that makes sliding contact with the outer surface of the inner boom, and a mounting shaft that projects from the back surface of this sliding plate and has bolt holes, and the mounting shaft of this sliding member is the outer boom. Install the sliding member by inserting it from the inside of the outer boom into the mounting hole of the sliding member that is drilled on the side surface of the outer boom, and screwing the flanged bolt into the bolt hole of the mounting shaft from the outside of the outer boom. I chose

If a shim is provided between the back surface of the sliding plate and the inner surface of the outer boom, it is possible to easily adjust the gap between the inner surface of the outer boom and the outer surface of the inner boom. If the mounting hole of the sliding member is a square hole and the mounting shaft of the sliding member is a square shaft, there is an effect of preventing the sliding member from rotating when the flanged bolt is screwed from the outside of the outer boom.

[0007]

[Action]

 When mounting the sliding member, simply insert the mounting shaft of the sliding member into the mounting hole from the inside of the outer boom, and screw one flanged bolt from the outside of the outer boom into the bolt hole of the mounting shaft. Well, therefore, the sliding members on both the left and right sides of the boom can be adjusted and fixed at the same time, which facilitates the adjustment. Further, even if the sliding contact surface is worn due to use, the sliding plate does not move.

[0008]

【Example】

 1 is a side view of the telescopic boom, FIG. 2 is an enlarged side view showing a sliding member mounting portion, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and FIG. 4 is a sectional view taken along line 4-4 of FIG. Is. The telescopic boom B is a three-stage boom in which the intermediate boom MB is inserted in the base boom BB and the tip boom TB is inserted in the intermediate boom MB. Here, in the relationship between the base boom BB and the intermediate boom MB, the base boom BB is the outer boom 1, the intermediate boom MB is the inner boom 7, and the relationship between the intermediate boom MB and the tip boom TB is the intermediate boom MB. Is the outer boom 1 and the tip boom TB is the inner boom 7. The front end of the base boom BB is located between the inner surface of the base boom BB and the outer surface of the intermediate boom MB, and the intermediate boom. Sliding members 20 are provided at the front end of the MB between the inner side surface of the intermediate boom MB and the outer side surface of the tip boom so as to slide and expand and contract.

The sliding member 20 is composed of a sliding plate 21 that is in sliding contact with the outer surface of the inner boom 7, and a mounting shaft 22 that has a quadrangular cross section and that projects from the rear surface of the sliding plate 21. 22 is provided with a bolt hole 23. The side surface of the outer boom 1 is provided with a mounting hole 24 for the rectangular sliding member 20. When mounting the sliding member 20, as shown in FIG. 5, the mounting shaft 22 of the sliding member 20 is inserted into the mounting hole 24 from the inside of the outer boom 1, and the rear surface of the sliding plate 21 and the outer boom are fitted. An appropriate number of shims 25 are provided between the inner boom 7 and the inner side surface of the inner boom 7 so that the inner boom 7 can smoothly slide and expand and contract with respect to the outer boom 1. After adjusting the clearance, the bolt with flange 26 is screwed into the bolt hole 23 of the mounting shaft 22 from the outside of the outer boom. Then, the flange portion 27 of the flanged bolt 26 comes into contact with the outer surface of the outer boom 1, and the sliding member 20 is fixed to the outer boom 1. In this embodiment, since the mounting shaft 22 and the mounting hole 24 of the sliding member 20 have a square shape, there is a rotation preventing effect, and the flanged bolt 26 can be tightened with one hand, and the screwing operation is easy. It should be noted that other shapes such as a polygonal shape and a shape with a stopper can be adopted for the rotation stopper of the sliding member 20.

When the sliding contact surface of the sliding plate 21 is worn due to use and the gap between the inner boom 7 and the inner boom 7 is increased, the flanged bolt 26 is loosened, the shim 25 is added, and the flanged bolt 26 is added again. Just tighten. It is desirable to provide a total of four sliding members 20 on each of the outer booms 1, one on each side of the tip of the boom and one on each side and one on each side.

[0011]

[Effect of the device]

 As described above, according to the mounting structure of the sliding member of the telescopic boom of the present invention, when the sliding member is mounted, the mounting shaft of the sliding member is inserted from the inside of the outer boom to mount the sliding member. It is only necessary to screw one flanged bolt from the outside of the outer boom into the bolt hole of the shaft. Therefore, the sliding members on both the left and right sides of the boom can be adjusted simultaneously, the work is easy and the sliding member is secure. The sliding plate does not move even if the sliding contact surface is worn due to use.

[Brief description of drawings]

FIG. 1 is a side view of a telescopic boom.

FIG. 2 is an enlarged side view showing a sliding member mounting portion.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is an explanatory diagram of attachment of a sliding member.

FIG. 6 is an explanatory view of a conventional sliding member mounting structure.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is an explanatory view of a conventional sliding member mounting structure.

[Explanation of symbols]

 1 Outer Boom 7 Inner Boom 20 Sliding Member 21 Sliding Plate 22 Mounting Shaft 23 Bolt Hole 24 Mounting Hole 25 Shim 26 Flange Bolt

Claims (3)

[Scope of utility model registration request] 1. An expandable boom in which an inner boom is fitted and inserted in 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 to allow the telescopic boom to expand and contract. The sliding plate is in sliding contact with the outer side surface of the inner boom, and the mounting shaft is provided on the rear surface of the sliding plate and has a bolt hole. The mounting shaft of the sliding member is formed on the side surface of the outer boom. A structure for mounting a sliding member of a telescopic boom, which is inserted from the inside of the outer boom into the mounting hole of the sliding member provided, and a bolt with a flange is screwed into the bolt hole of the mounting shaft from the outside of the outer boom. 2. The structure for mounting a sliding member of a telescopic boom according to claim 1, wherein a shim is provided between the rear surface of the sliding plate and the inner surface of the outer boom. 3. The mounting structure for a sliding member of a telescopic boom according to claim 1, wherein the mounting hole of the sliding member is a square hole, and the mounting shaft of the sliding member is a square shaft.