JPH0544988U - Telescopic guide device for multi-stage telescopic boom - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a telescopic guide device attached to an upper boom of a multi-stage telescopic boom, which can easily adjust the amount of protrusion of a sliding surface of a slider member even after the multi-stage telescopic boom is assembled. . [Structure] The telescopic guide device 10 is configured by attaching a slider member 12 to a side surface of an upper boom 22 such that the slider member 12 is movable in an extension direction and a retraction direction with respect to a side surface of the upper boom 22. A wedge member 15 that moves in a direction perpendicular to the moving direction of the slider member 12 and pushes the slider member 12 in the protruding direction is provided on the side of the slider member 12 in the retracting direction. Further, a wedge moving means 16 having an operating portion 16a arranged inside the upper boom 22 is provided.
The wedge moving means 16 moves the wedge member 15 in a direction perpendicular to the moving direction of the slider member 12 by operating the operation portion 16a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a multi-stage telescopic boom configured by telescopically inserting an upper stage boom into a lower stage boom, and further relates to a telescopic guide device attached to the upper stage boom.

[0002]

[Prior Art]

 A telescopic guide device is attached to the base end portion of the upper boom in the multi-stage telescopic boom as described above so that the telescopic movement with respect to the lower boom of the upper boom can be smoothly performed. The telescopic guide device includes a slider member attached to the outer surface of the upper boom so as to project outward, and the end surface (sliding surface) of the slider member in the protruding direction is attached to the lower boom. The upper and lower booms are extended and retracted by abutting and sliding on the inner surface of the upper boom.

Since the width of the gap between the inner surface of the lower boom and the outer surface of the upper boom differs for each multi-stage telescopic boom, the amount of protrusion of the sliding surface of the slider member relative to the outer surface of the upper boom is After assembling each multi-stage telescopic boom, it was adjusted by inserting or pulling out an appropriate member (shim) between the slider member and the outer surface of the upper boom.

[0004]

[Problems to be solved by the device]

 However, such an adjusting method has a problem that it is difficult to perform the adjusting work in a narrow gap between the lower boom and the upper boom, for example. The present invention has been made in view of the above problems, and is an extension guide device attached to an upper boom, which makes it easy to adjust the amount of protrusion of the sliding surface of the slider member even after the multistage extension boom is assembled. It is an object of the present invention to provide a telescopic guide device for a multi-stage telescopic boom that can be used for various purposes.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the telescopic guide device of the present invention, a slider member is pulled to the side surface of the upper boom in the direction of extension of the side surface of the upper boom and to the inside of the side surface of the upper boom. It is attached so as to be movable in the retracting direction. Further, a wedge member is provided laterally to the retracting direction of the slider member, the wedge member moving in a direction perpendicular to the moving direction of the slider member and pushing the slider member in the projecting direction. Further, a wedge moving means for moving the wedge member in a direction perpendicular to the moving direction of the slider member is provided which has an operating portion arranged inside the upper boom. Is provided.

[0006]

[Action]

 In such a telescopic guide device, the operation portion of the wedge moving means can be operated inside the upper boom, which is a space wider than the gap between the lower boom and the upper boom. Then, if the wedge member is moved in the direction in which the slider member is pushed through the operation, the slider member is moved in the projecting direction, and the amount of projection of the sliding surface of the slider member with respect to the outer surface of the upper boom is increased. Can be increased. On the other hand, by moving the wedge member away from the slider member, movement of the slider member in the retracting direction, that is, a decrease in the amount of protrusion of the sliding surface is allowed.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, a multi-stage telescopic boom equipped with a telescopic guide device according to the present invention will be described with reference to FIG. The multi-stage telescopic boom 20 is mounted, for example, on the vehicle body 31 of the aerial work vehicle 30. The multi-stage telescopic boom 20 is a lower stage boom 21 pivotally attached to an upper part of a swivel base 32 which is pivotally attached to a vehicle body 31, and is telescopically inserted into the lower stage boom 21. It is composed of an upper boom 22. A workbench 35 is attached to the tip of the upper boom 22, and an operator who rides on the workbench 35 swings the swivel base 32 and raises and lowers the multi-stage telescopic boom 20 to move it to a desired height. Can be moved to.

The telescopic guide device 10 is attached to both side surfaces of the base end portion of the upper boom 22 in the multi-stage telescopic boom 20 configured as described above. The extension / contraction guide device 10 will be described below with reference to FIG. As shown in FIG. 1 (a), the expansion and contraction guide device 10 is a box-shaped housing 11 having an opening on one side, and a thick plate-like member. The slider member 12 is movably received in the projecting direction and the retracting direction.

A contact plate 14 is attached to the end surface of the slider member 12 in the retracting direction by a flat screw 13 inserted from the end surface of the slider member 12 in the protruding direction. As shown in FIG. 1 (b), the center portion of the backing plate 14 is an inclined surface inclined so as to approach a side surface (hereinafter referred to as a back surface) 11 a facing the opening surface of the housing 11 as it goes downward. 14a is formed, and a wedge member 15 formed in a wedge shape is received between the inclined surface 14a and the back surface 11a of the housing 11.

A screw hole 11b (see FIG. 1B) is formed in the center of the upper surface of the housing 11, and a bolt (wedge moving means) 16 of the housing 11 is formed in the screw hole 11b. It is screwed in from above. The bolt 16 has a head portion (operating portion) 16a at its upper end. The lower end of the bolt 16 is rotatably attached to the upper part of the wedge member 15.

The telescopic guide device 10 thus configured is attached to both inner side surfaces of the base end portion of the upper boom 22 (see FIG. 3). At this time, as shown in FIG. 1B, the peripheral portion of the opening surface of the housing 11 is received in the guide device mounting hole 22a formed in a rectangular shape on the side surface of the base end portion of the upper boom 22. As a result, the slider member 12 is movable in the extension direction in which it is extended outward from the side surface of the upper boom 22 and in the extension direction in which it is retracted inwardly into the side surface of the upper boom 22, and its end face in the extension direction (hereinafter , A sliding surface) 12a extends beyond the outer surface of the upper boom 22.

After mounting on the upper boom 22, the bolt 16 is rotated by rotating the head portion 16a using an appropriate tool to move the wedge member 15 downward (in the slider member 12 in FIG. 1B). When moved in a direction perpendicular to the moving direction), the wedge member 15 pushes the contact plate 14 and the slider member 12 in the projecting direction. As a result, the amount of protrusion of the sliding surface 12a can be increased and the sliding surface 12a can be brought into contact with the inner side surface 21a of the lower boom 21. It should be noted that if the bolt 16 is rotated and the wedge member 15 is moved upward in FIG. 1 (b) and separated from the contact plate 14, the contact plate 14 and the slider member 12 are retracted by the distance, that is, A decrease in the amount of protrusion of the sliding surface 12a is allowed.

In this way, by adjusting the amount of protrusion of the sliding surface 12a of each telescopic guide device 10 attached to each side surface of the upper boom 22 to be equal to each other, the upper boom 22 is centered in the width direction of the lower boom 21. Can be located at. Then, the upper boom 22 is smoothly extended and contracted with respect to the lower boom 21 by the sliding surface 12 a sliding on the inner surface of the lower boom 21.

By the way, in order to adjust the amount of protrusion of the sliding surface 12a, as shown in FIG. 3, above the bolt 16 on the upper surface of the base end portion of the upper boom 22, the tool insertion hole 22b, 22b is formed. Further, tool insertion holes 21b, 21b are also formed on the upper surface of the base end portion of the lower boom 21, and when the lower boom 21 is in the fully retracted state with respect to the upper boom 22, the booms 21, 22 are respectively attached. The tool insertion holes 21b and 22b thus formed overlap each other. A tool can be inserted into the upper boom 22 from the outside of the multi-stage telescopic boom 20 through the tool insertion holes 21b and 22b to operate the head portion 16a, so that the amount of protrusion of the slider member 12 can be adjusted. It can be easily performed even after assembling 20.

In the above embodiment, the expansion / contraction device 10 is configured so that the head portion 16a of the bolt 16 faces upward. However, as shown in FIG. 4, the head portion 16a ′ has the base end of the upper boom 22. The expansion / contraction guide device 10 'may be configured to face the direction. As a result, a tool can be inserted into the upper boom 22 from the base end opening of the multi-stage telescopic boom 20 to operate the head portion 16a '.

Further, although the multi-stage telescopic boom 20 including the upper and lower two-stage booms 21 and 22 has been described in the above embodiment, the telescopic guide device according to the present invention is also used for a multi-stage telescopic boom having more stages. be able to.

[Effect of the device]

 As described above, in the telescopic guide device of the present invention, the operating portion of the wedge moving means can be operated inside the upper boom, which is a wide space, and the sliding surface of the slider member can be operated only by performing the operation. The amount of protrusion of the upper boom to the outer surface can be adjusted. Therefore, by using this telescopic guide device, the amount of protrusion of the sliding surface of the slider member can be easily adjusted even after the multi-stage telescopic boom is assembled, and proper telescopic guide is always provided for the lower boom of the upper boom. Can be done.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of a telescopic guide device according to the present invention,
(B) is sectional drawing of the said expansion-contraction guide device in the state attached to the upper boom.

FIG. 2 is a side view of a multi-stage telescopic boom including the telescopic guide device and an aerial work vehicle including the multi-stage telescopic boom.

FIG. 3 is a perspective view of a base end portion of the multi-stage telescopic boom.

FIG. 4 is a perspective view of a base end portion of the multi-stage telescopic boom.

[Explanation of symbols]

 10, 10 'Telescopic guide device 12 Slider member 15 Wedge member 16 Bolt (wedge moving means) 16a, 16a' Head part (operating part) 20 Multistage telescopic boom 21 Lower stage boom 22 Upper stage boom

Claims (1)

[Scope of utility model registration request] 1. A telescopic guide device for a multistage telescopic boom, wherein the upper boom is telescopically inserted into the lower boom in a telescopic manner, the telescopic guide device being provided on a side surface of the upper boom and on an outer side surface of the upper boom. A member that is movably attached in the overhanging direction and in the retracting direction in which the upper boom is drawn inwardly of the side surface of the upper boom, and the end surface in the protruding direction slidably contacts the inner surface of the lower boom. A slider member that is a sliding surface, and is arranged laterally of the slider member in the pull-in direction,
A wedge member that pushes the slider member in the bulging direction by moving the slider member in a direction perpendicular to the moving direction of the slider member; and an operating portion arranged inside the upper boom, A telescopic guide device for a multi-stage telescopic boom, comprising: wedge moving means for moving the wedge member in a direction perpendicular to a moving direction of the slider member by operating an operating portion.