JPH0556642U - Ladder for lifting mobile cranes - Google Patents

Abstract

(57) [Summary] [Objective] The present invention relates to a ladder for elevating a mobile crane. The conventional mobile crane is equipped with a ladder prepared separately for getting on and off the operator's cab 4 of the swivel base. However, in the case where a ladder is separately prepared, it is necessary to carry the entire ladder, and there is a problem that the handling is troublesome. The present invention seeks to provide a lifting ladder that is easy to handle. [Structure] The upper end of the ladder 5 is connected to one side of the vehicle 1 in the vehicle width direction via a connecting means 6, and the connecting means 6 is connected.
Is configured to allow swinging of the ladder 5 about the connecting means 6 in the width direction and the direction orthogonal thereto, so that the ladder 5 is positioned so that one side in the width direction is on the upper side and one side of the vehicle 1 is on the upper side. The posture can be changed between a retracted state in the vehicle width along the side and a tilted use state in which the lower end portion is grounded, and the ladder 5 is fixed in the retracted position between the ladder 5 and the vehicle 1 in place. A ladder for raising and lowering a mobile crane, characterized in that a fixing means 7 is attached.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a lifting ladder for a mobile crane. It

[0002]

[Prior Art]

 The mobile crane has a swivel mounted on the vehicle so that it can swivel freely, and a boom that is installed on the swivel in a undulating manner, and the swivel is equipped with a cab for crane work.

In this type of mobile crane, it is necessary for an operator to get on and off the operator's cab of the swivel platform, but with the increase in size of the mobile crane, getting on and off was difficult. For this reason, conventionally, a vertical ladder has been fixedly arranged on one side of the vehicle so as not to protrude from the vehicle width, or a ladder for bridging between the vehicle and the ground has been prepared separately. However, a vertical ladder placed on one side of the vehicle has an unnatural posture when getting on and off, which poses a safety problem.In addition, when a ladder is prepared separately, it is not possible to remove the ladder when removing it. There was a problem that the ladder had to be transported and the handling was troublesome.

[0004]

[Problems to be solved by the device]

 The present invention provides an elevating ladder that is always attached to a vehicle of a mobile crane and that can easily change its posture between a retracted position within a vehicle width and an inclined use position, thereby solving the above-mentioned problems of the prior art. The purpose is.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the lifting ladder of the mobile crane of the present invention is constructed as follows. It is a lifting ladder used in a mobile crane that has a swivel mounted on the vehicle so that it can swivel and a boom that can be raised and lowered to be mounted on the swivel, and a driver's cab for crane work is attached to the swivel. The upper end of the ladder is connected to one side of the vehicle in the vehicle width direction through a connecting means, and the connecting means is arranged in the width direction of the ladder centered on the connecting means and in the direction orthogonal to this. The ladder is configured so that one side in the width direction is on the upper side and the ladder is stored in the vehicle width along one side, and the lower end is in the inclined use state in which the lower end is grounded. A lifting ladder for a mobile crane, characterized in that a fixing means for fixing the ladder in the storage posture is attached between the ladder and the vehicle at an appropriate position.

[0006]

[Action]

 The ladder for raising and lowering the mobile crane of the present invention configured as described above can change the posture manually between the retracted state and the tilted use state with the fixing means released. Since it can be achieved by rotating around the connecting means for rotatably connecting the upper end of the above, it can be performed easily and surely.

[0007]

【Example】

 An embodiment of the steps for raising and lowering a mobile crane according to the present invention will be described below with reference to FIGS. FIG. 1 shows a mobile crane equipped with a lifting ladder according to the present invention. In FIG. 1, the mobile crane has a swivel 2 mounted on a vehicle 1 so that the swivel can swing freely, and a boom 3 mounted on the swivel 2 so that the swivel 2 can move up and down. It is configured by attaching. In FIGS. 1 and 2, A is a lifting ladder, which is a ladder 5, a connecting means 6 for connecting the upper end of the ladder 5 to one side in the vehicle width direction of the vehicle 1, and a ladder 5. It is composed of a fixing means 7 mounted between the vehicle 1 at appropriate places.

The connecting means 6 connects the upper end of the ladder 5 to the outer end of the fender 1 a of the vehicle 1 (corresponding to one side in the vehicle width direction of the vehicle 1). The intermediate member 8 and this intermediate member 8 is rotatably supported on the ender 1a so as to be rotatable about a horizontal axis 9 extending in the vehicle width direction, and the ladder 5 is provided around an axis 11 orthogonal to the axis 9 of the rotation support mechanism 10. It is composed of a rotation support mechanism 12 that connects the upper end of the ladder 5 to the intermediate member 8 so that it can swing. The rotation support mechanism 12 supports the ladder 5 swingably around the axis 11 in a direction orthogonal to the width direction thereof.

The connecting means 6 configured as described above allows the ladder 5 to swing about the connecting means 6 in the width direction and the direction orthogonal thereto. The ladder 5 whose upper end is supported by the connecting means 6 is in a stored state in the vehicle width along one side in the width direction and one side in the vehicle width direction (indicated by solid lines in FIGS. 1 and 2). The posture can be changed between a state shown in FIG. 2) and an inclined use state in which the lower end portion is grounded (state shown by phantom lines in FIGS. 1 and 2). The fixing means 7 is arranged at the outer end of the fan 1a corresponding to the base end of the ladder 5 in the retracted state, and locks the ladder 5 in the retracted state.

The connecting position of the connecting means 6 is such that, in the traveling state of the mobile crane in which the boom 3 is laid down toward the front of the vehicle 1, the outer end portion (of the vehicle 1 of the vehicle 1 near the entrance / exit of the swivel base 2 is located. It is attached to one side in the vehicle width direction).

In the above embodiment, the center of rotation of the connecting means 6 (the intersection of the axis 9 and the axis 11) is located on one side of the tip of the ladder 5 (one side in the width direction of the ladder 5). Since the ladder 5 in the storage state is stored with the one side facing up, there is an effect that the protrusion amount of the ladder 5 in the storage state can be eliminated or reduced. However, it goes without saying that where the center of rotation of the connecting means 6 is brought to the upper end of the ladder 5 may be appropriately changed if necessary. The connecting means 6 may be any means as long as the ladder 5 can be swung about the connecting means 6 in the width direction and the direction orthogonal thereto. Instead of the connecting means 6, for example, a ball fulcrum is used. Of course, it is okay.

The ladder for lifting the mobile crane configured as described above can be easily operated by holding the base end portion of the ladder 5 to easily change the posture between the retracted state and the inclined use state. It is a thing.

[0013]

[Effect of the device]

 The ladder for elevating and lowering the mobile crane of the present invention configured as described above can change the posture manually between the retracted state and the tilted use state with the fixing means 7 released, and the posture can be changed. Since it can be achieved by turning around the connecting means for rotatably connecting the upper end of the, it can be handled very easily, and its practical effect is great. .

[Brief description of drawings]

FIG. 1 is a side view of a mobile crane adopting a lifting ladder according to the present invention.

2 is a partially cutaway perspective view of FIG. 1. FIG.

[Explanation of symbols]

 1 vehicle 2 swivel 3 boom 4 operator's cab 5 ladder 6 connecting means 7 fixing means

Claims (1)

[Scope of utility model registration request] 1. A lift used for a mobile crane comprising a swivel mounted on a vehicle so that the swivel can swing freely, and a boom mounted on the swivel so that the crane can move up and down, and a driver's cab for crane work is mounted on the swivel. A ladder for use, wherein the upper end of the ladder is connected to one side in the vehicle width direction of the vehicle through a connecting means, and the connecting means is arranged in the width direction of the ladder centered around the connecting means and directly in the same. Since the ladder is configured to be allowed to swing in one direction, one side of the ladder in the width direction is on the upper side and the ladder is stored in the vehicle width along one side, and the lower end of the ladder is tilted to the ground. A ladder for elevating a mobile crane, characterized in that the attitude can be changed depending on a state, and a fixing means for fixing the ladder in the storage attitude is attached between the ladder and the vehicle at an appropriate position.