JPH081559U - Mobile crane - Google Patents

Abstract

(57) [Summary] [Object] The present invention can be equipped with a telescopic boom 3 having a large telescopic stroke without increasing the rear end turning radius of the swivel base 1, so that the winch device can be used while working. Provide mobile cranes that have good workability without the risk of contacting buildings. [Structure] In a state where the telescopic boom 3 is contracted to the minimum, the base end of the inner boom 3b is configured to project rearward from the base end of the outer boom 3a, and the winch device 17 is raised and lowered as a fulcrum fulcrum. It is attached to the outside of the boom support bracket 2 on the opposite side of the cab A so as not to project above the upper surface of the telescopic boom 3 in front of the pin 4.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is a movement in which a retractable telescopic boom, and a driver's cab and winch device for both vehicle traveling and crane operation are mounted on a swivel mounted horizontally on the vehicle frame. This is related to the expression crane.

[0002]

[Prior art]

 As shown in FIG. 3, a conventional mobile crane of this type has a swivel base 1 mounted horizontally on a vehicle frame 11 of a vehicle 10 having an engine 14 mounted at the rear thereof, and the swivel base 1 The upper end of the outer boom 3a of the telescopic boom 3 is pivotally connected to the boom support bracket 2 of FIG. The driver's cab A and the winch 6 which are located on the side of the frame 3 and which are used for both vehicle traveling and crane operation are attached.

In the telescopic boom 3 equipped in this type of mobile crane, the base end portion of the inner boom 3b, which is inserted into the outer boom 3a in a telescopic manner, has the telescopic boom 3 attached thereto. It was constructed so that it would always be located inside the outer boom 3a regardless of the extended state of.

Further, in the winch device 6, the rear end turning radius (radius from the turning center of the turning base 1 to the rear end of the turning base) is set small so that the turning base 1 can perform the crane work in a narrow space. Due to this, there was no space to mount on the swivel base 1 behind the telescopic boom 3, and it was mounted on the upper surface of the telescopic boom 3.

[0005]

[Problems to be solved by the device]

 However, the conventional mobile crane has the telescopic boom 3 swiveled forward of the vehicle 10 in the most contracted state and the most prone position (the traveling state of the mobile crane). 3 is regulated by the allowable front overhang of the vehicle 10, and the rear end of the telescopic boom 3 is regulated at the rear end position of the swivel base 1 with a small rear swing radius. However, there is a problem that it is difficult to equip the telescopic boom 3 with a large telescopic stroke, and it is difficult to increase the operating range of the crane.

In addition, since the winch device 6 is mounted on the upper surface of the telescopic boom 3, when the telescopic boom 3 is raised during the work, the winch device 6 is moved backward from the upper surface of the telescopic boom 3. There is a possibility that the winch device 6 that greatly protrudes may come into contact with a beam or the like of a building and be damaged. For this reason, the driver is always required to grasp the position of the winch device 6 to work, and there is a problem that workability is poor.

The present invention has been made based on the above circumstances, and can be equipped with a large telescopic boom having a large telescopic stroke without increasing the rear end turning half diameter of the swivel base. Moreover, it is an object of the present invention to provide a mobile crane in which the winch device does not come into contact with a building or the like during work and has good workability.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is configured with the following effective problem solving means.

That is, in the mobile crane of the present invention, a swivel base is mounted on a vehicle frame having an engine mounted on the rear portion so as to be horizontally swivelable, and a boom support bracket for the swivel base is mounted. The upper part of the base end of the outer boom of the telescopic boom is pivotally connected via a hoisting fulcrum pin so that the telescopic boom can be raised and lowered. In a mobile crane in which a driver's cab that also serves as an operation and a winch device are attached, the base end of the inner boom is rearward from the base end of the outer boom when the telescopic boom is in the most contracted state. The winch device is attached to the outside of the boom support bracket on the opposite side of the operator's cab so that the winch device does not project above the upper surface of the telescopic boom in front of the undulating fulcrum pin. Has been done.

As described above, in the construction of the movable crane of the present invention, the base end of the inner boom is rearward from the base end of the outer boom when the telescopic boom is in the most contracted state. Since it is configured to project to the rear, the pivotal connection position (position of the undulating fulcrum pin) of the outer boom is moved by the length corresponding to the rearward projecting amount of the inner boom in the direction of the tip of the telescopic boom. Can be moved to. As a result, the expansion stroke of the inner boom with respect to the outer boom can be increased without increasing the turning radius of the rear end of the swivel base.

Further, since the winch device is attached to the outside of the boom support bracket on the opposite side of the operator's cab so as not to project above the upper surface of the telescopic boom in front of the undulating fulcrum pin, Even if the telescopic boom is raised during the work, the winch device does not move, and there is no risk that the winch device will contact the building and be damaged. As a result, the driver does not have to constantly grasp the position of the winch device to work, which improves workability. Further, since the winch device is attached to the outside of the boom support bracket on the opposite side of the operator's cab, the telescopic boom is configured so that the rear end of the inner boom projects rearward. However, the rear protrusion of the inner boom does not interfere with the winch device when the telescopic boom is driven up and down.

[0012]

[Effect of device]

 As a result, according to the mobile crane of the present invention, it is possible to install a telescopic boom having a large telescopic stroke without increasing the turning radius of the rear end of the swivel base, and the operation of the crane can be performed. The range can be increased.

Further, when the telescopic boom is raised, there is no risk of the winch device coming into contact with a building or the like, and therefore it is not necessary to always grasp the position of the winch device to perform work. Is improved.

[0014]

[Embodiment of device]

 1 and 2 show the structure of a mobile crane according to an embodiment of the present invention.

In the mobile crane of this embodiment, for example, as shown in FIG. 1, a swivel base 1 is mounted on a vehicle frame 11 of a vehicle 10 having an engine 14 at a rear portion thereof so as to be horizontally swivelable. At the same time, the base end upper portion of the outer boom 3a of the telescopic boom 3 is rotatably and pivotally connected to the boom support bracket 2 attached to the swivel base 1 through the undulation fulcrum pin 4. It is configured. Further, on the swivel base 1, there is mounted a driver's cab A located on the side of the telescopic boom 3 for both vehicle traveling and crane operation.

The expandable boom 3 is configured such that the base end portion of the inner boom 3b projects rearward from the base end portion of the outer boom 3a when the expandable boom 3 is in the most contracted state. Has been done. Therefore, the telescopic boom 3 has its pivotal connection position (the position of the undulating fulcrum pin 4) of the outer boom 3a extended by the length corresponding to the rearward protruding amount of the inner boom 3b. It is possible to increase the expansion stroke of the inner boom 3b with respect to the outer boom 3a without increasing the rear turning radius of the swivel base 1. It has become. The expandable boom 3 is composed of an outer boom 3a and four inner booms 3b, 3c, 3d, 3e which are fitted into the outer boom 3a so as to be expandable and contractable in order. Has been done.

Further, the telescopic boom 3 has an eye point e in the cab A when the crane is traveling and moving, that is, when the telescopic boom 3 is swiveled forward of the vehicle 10 and is most prone. It is attached to the boom support bracket 2 of the swivel base 1 so as to be positioned below (the position of the operator's eyes). For this reason, the driver who gets on the driver's cab during traveling can visually confirm the traveling state of the opposite lane through the upper surface of the expansion boom 3 to confirm the safety.

Further, the swivel base 1 of the swivel base 1 does not interfere with the rearward projecting portion of the inner boom 3a and the lower part of the swivel base 1 when the telescopic boom 3 is contracted to the maximum and is driven up and down. A space S is formed in the lower portion, that is, in the lower portion of the telescopic boom 3 of the boom supporting bracket 2 of the swivel base 1.

Reference numeral 17 is a winch device attached to the boom support bracket 2 of the swivel base 1. The winch device 17 is located between the boom support bracket 2 on the opposite side of the cab A and the outside of the swivel base 1 so as not to project above the upper surface of the telescopic boom 3 at a position forward of the undulating fulcrum pin 4. Installed. Therefore, even when the telescopic boom 3 is raised during the work, the winch device 17 does not come into contact with a building or the like, and the driver does not need to always grasp the position of the winch device 17 to perform the work. It is possible to improve the sex.

Further, since the winch device 17 is attached to the boom support bracket 2 on the opposite side of the operator's cab A, the telescopic boom 3 has the rear end of the inner boom 3b protruding rearward. Even with such a construction, the rearward projecting portion of the inner boom 3b does not interfere with the winch device 6 when the telescopic boom 3 is driven up and down.

The wire rope 9 pulled out from the winch device 17 is located near the undulating fulcrum pin 4 in a side view, and its upper edge is located near the height of the undulating fulcrum pin 4. The laterally movable pulley 6a arranged on the boom support bracket 2 of No. 1 and the outer boom 3a are arranged so as to extend laterally from the upper surface of the outer boom 3a at a position near the tip of the outer boom 3a. The pulley 7 serving as a fulcrum of the free angle and a pulley (not shown) arranged at the center of the upper surface of the outer boom 3a are passed through a hook block (not shown) from the end of the telescopic boom 3 Is to be hung.

Reference numeral 5 denotes a hoisting cylinder that is interposed between the swivel base 1 and the outer boom 3a and drives the telescopic boom 3 to hoist. Further, 12 and 13 are front wheels and rear wheels arranged in front of and behind the vehicle frame 11, respectively. Reference numerals 15 and 16 are a front outrigger and a rear outrigger attached to the front and rear ends of the vehicle frame 11.

[Brief description of drawings]

FIG. 1 is a side view illustrating a mobile crane according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating the movable crane.

FIG. 3 is a side view of a conventional mobile crane.

[Explanation of symbols]

 Reference Signs List 1 swivel base 2 boom support bracket 3 telescopic boom 3a outer boom 3b to 3e inner boom 4 undulating fulcrum pin 5 undulating cylinder 10 vehicle 11 vehicle frame 17 winch device A cab

Claims (1)

[Scope of utility model registration request] 1. A swivel base is mounted on a vehicle frame having an engine mounted on a rear part thereof so as to be horizontally swivelable, and an upper part of an outer boom base end of a telescopic boom is mounted on a boom support bracket of the swivel base. Is pivotally connected via an up / down fulcrum pin
In a movable crane, which is mounted on a side of the telescopic boom on the revolving base and is provided with a driver's cab for driving a vehicle and operating a crane and a winch device, the telescopic boom is minimized. In this state, the base end of the inner boom is configured to project rearward from the base end of the outer boom, and the winch device is located forward of the fulcrum fulcrum pin and above the upper surface of the telescopic boom. A movable crane attached to the outside of a boom support bracket opposite to the cab so as not to protrude from the cab.