JPH11165982A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane that is able to perform the setup of a scaffold without requiring any labor of an operator, while it is provided with a scaffolding structure capable of preventing any missteping and falling of the operator at the setup scaffold. SOLUTION: In this mobile crane equipped with a crane steering driver's seat 4 in a swivel base freely swivelably loaded on a top face of a carrier part, aside from a traveling driver's seat, this crane steering driver's seat 4 is made projectable sideward, and it is equipped with each step 8 capable of shifting to the sideward projected position of the crane steering driver's seat 4 and a storage position underneath this driver's seat 4, and a handrail member 19 being prostratable on a top face of this step 8, respectively. This step 8 is driven by the equipped driving source 12 and made shiftable to the projected position projecting as far as its walkable width and the storage position, and thereby it is able to raise up the handrail member 19 at the projected position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile crane, and more particularly, to a crane operator's seat in an all terrain crane provided with a crane operating operator's seat in a carrier portion of the crane separately from a public road operator's operator's seat. About the scaffold structure.

[0002]

2. Description of the Related Art An all terrain crane is provided with a crane operator's seat for operating the crane. When operating the crane, the operator operates the crane while checking the state of the crane. As is known, all-terrain cranes often use a multi-axle carrier to reduce the axle load per wheel, and have a wheel outer diameter to increase the ground contact area per wheel. Is often large. Therefore, a ladder or the like is used when getting on and off the crane driver's seat located on the upper surface of the carrier unit. On the other hand, the crane driver's seat may be configured to protrude to the side of the carrier portion so that the state of the crane tip during operation can be easily checked. However, when moving into or out of the crane operator's seat from the top of the carrier, or when the crane operator's seat protrudes from the same position as the width direction end of the carrier or the width of the crane operator's seat, getting on / off the crane operator's seat Becomes difficult. Therefore, it has been proposed to provide a step that can be moved forward and backward below the entrance door of the crane driver's seat, and use that step as a foothold to enable the operator to get on and off the crane driver's seat (for example, Japanese Utility Model Laid-Open No. 55-58888). .

[0003]

However, in the conventional scaffold structure, the steps must be manually extended and retracted, so that when the height to the upper surface of the carrier portion is high, the operation is troublesome. Not only that, it is necessary to prepare a stepladder and a ladder for the operation. Moreover, in the conventional scaffold structure, only steps having a space for placing a foot are provided, and no measures are taken to prevent an accident such as a stepping off of a step provided at a high place. For this reason, even if the steps are overhanging, getting on and off the crane driver's seat must be performed carefully.

An object of the present invention is to provide a scaffold that can be installed without requiring the labor of an operator in view of the above-mentioned problems of the conventional mobile crane, particularly a scaffold structure of a crane operator's seat. It is another object of the present invention to provide a mobile crane provided with a scaffold structure capable of preventing a worker from stepping off and falling.

[0005]

In order to attain this object, the invention according to claim 1 provides a crane operation driver seat separately from a traveling driver seat on a swivel that is swingably mounted on an upper surface of a carrier part. In the mobile crane provided, the crane operating driver's seat can be protruded to the side, and can be moved to a protruding position on the side of the crane operating driver's seat and a storage position on a lower surface of the crane operating driver's seat. A step and a handrail member that can be turned over on the upper surface of the step, wherein the step can be moved to a projecting position and a storage position that are driven by an installed driving source and project to a walking width. In this case, the handrail member can be raised at the protruding position.

According to a second aspect of the present invention, in the mobile crane according to the first aspect, the step includes, in addition to the side of the crane operating driver's seat, a front portion of the operator's seat and a side opposite to the side. The steps that are provided at the front side and the side opposite to the side are previously provided integrally with the driver's seat, and the steps at the side of the driver's seat and the driver's seat are provided in advance. Any one of the integrated steps is located near the upper surface of the carrier portion when the driver's seat is turned.

According to a third aspect of the present invention, in the mobile crane according to the first aspect, the handrail member surrounds a side, a front portion, and a side opposite to the side of the crane operation driver's seat. It is characterized by being arranged in.

[0008]

According to the first and third aspects of the present invention, a drive source is driven by operating a switch from outside the crane operating driver's seat to walk around the crane operating driver's seat, especially steps located on the side. Since the overhanging position and the retracting position for projecting to the possible width can be set, labor for manual operation by an operator is not required at the time of overhanging and storing the step. In addition, the step at the overhanging position is set to a width that allows the user to walk instead of simply putting his / her feet, so that the operator can freely move around the crane operation driver's seat. Further, since the steps, especially the steps located on the side, the front part, and the side opposite to the side of the crane operation driver seat are provided with handrail members, the safety when the operator moves around, especially the operator falls down It is possible to ensure safety on the side of the driver's seat for operating the crane, which is at high risk.

According to the second aspect of the present invention, when the crane operation driver's seat turns together with the turning of the crane, any one of the steps at the side of the driver's seat, the front portion, and the position opposite to the side is partially removed. Since the vehicle can be located near the upper surface of the carrier portion, getting on and off the driver's seat for operating the crane can be performed through steps located near the upper surface of the carrier portion. Thus, getting on and off and moving can be performed regardless of the turning position.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a perspective view showing a mobile crane according to an embodiment of the present invention. The mobile crane shown in FIG. 1 is an all terrain crane, in which a swivel 3 having a boom 2 is disposed on the upper surface of a carrier 1A forming a lower traveling body. Cabin 4 serving as a driver's seat for crane operation
Is provided. In FIG. 1, reference numeral 1B indicates a driving driver's seat located at the front of the carrier. FIG.
FIG. 3 is a perspective view showing the cabin around the swivel 3 in which the cabin 4 can be extended to the side of the carrier 1A during crane operation. Although the details of the mechanism for extending the cabin 4 to the side are not shown, a cabin support arm 6 having a swing fulcrum near the swivel large gear is provided, and the cabin 4 Can be selected from a state in which the cabin-shaped frame 5 on which is mounted and fixed is extended to the side of the carrier section 1A and a state in which it is positioned on the upper surface of the carrier section 1A.

FIG. 2 is a local perspective view showing a lower surface of the support portion of the cabin 4. In FIG. 2, a cabin support frame 5 is provided with a cabin extension arm 6 on the lower surface of the cabin 4 (see FIG. 1). It is connected to the swing end. The cabin support frame 5 has a size that allows the cabin 4 to be placed and fixed, and a step forming a scaffold is provided around the lower surface of the cabin 4. As shown in FIG. 3, the steps include an inner step 7 located on the side of the cabin 4 on the side of the carrier 1A, an outer step 8 protruding outside the carrier 1A on the side opposite to this side, A front step 9 is provided on the front side. The overhang width of each of these steps, including the time when the outer step 8 is overhanging, is set to a width that allows the operator to walk. Thereby, each step is provided in a state surrounding the front part and both side parts of the cabin 4. Further, the extended length along each surface of the cabin 4 in each step in the overhanging state, as shown in FIG. 4, regardless of the turning position of the cabin 4 in any of the steps 7, 8, 9, 9A. , And a length that can be located near the upper surface of the carrier 1A so that the vehicle can move from the cabin 4 to the upper surface of the carrier 1A.

Among the steps, the inner step 7 and the front step 9 are fixed to the cabin support frame 5 in advance, and the outer step 8 is movable with respect to the cabin support frame 5 in the direction in which the cabin 4 projects. It is provided in. This moving mechanism will be described later.

A corner step 9A located at a position facing the outer step 8 in the front step 9 is folded on the upper surface of the front step 9 via a lying position shown by a solid line and an upright position shown by a two-dot chain line in FIG. And is supported so as to be able to swing so as not to protrude from the side surface of the cabin 4 when in the folded position.

The outer step 8 can be moved in the overhang direction of the cabin 4 by the structure shown in FIG. In FIG. 5, the cabin support frame 5
Among them, a slide guide portion 5A is formed by bending the upper surface of the cabin support frame 5 'provided in parallel with the direction in which the cabin 4 extends. On the other hand, the outer step 8 includes lower surface frames 8 located on both sides in the direction in which the cabin 4 projects in the direction indicated by the arrow F in FIG.
A is formed of a frame portion by an upward channel material, and a guide roller 10 that can abut the slide guide portion 5A is attached to the rear of the lower surface frame 8A in the extending direction, and is provided in front of the lower surface frame 8A in the extending direction. The advancing / retreating drive roller 11 is in contact with its lower surface.

The forward / backward drive roller 11 is a roller whose surface is knurled to increase the frictional force with the lower frame 8A.
It is to be done by. Electric motor 12
Is a forward / reverse rotatable motor attached to a support portion (not shown) of the cabin support frame 5, and as shown in FIG. 3, a drive switch mounted on an operation panel 4A provided outside the cabin 4 (Not shown)
Is driven to rotate. The electric motor 12 causes the outer step 8 to protrude outward in the direction in which the cabin 4 extends in a direction in which the cabin 4 can protrude, and, as shown in FIG.
It can be stored in the lower surface of the.

The outer step 8 which is driven by the electric motor 12 and is in the extended position is held at that position. That is, FIG. 6 is a perspective view showing a holding mechanism of the outer step 8. In FIG. 6, a lower surface frame 8A of the outer step 8 is integrated with a locking piece 13 formed of an angle piece on a side surface. A locking hole 13A is formed in the upper piece of the stopper 13 at the rear position. On the cabin support frame 5 side facing the locking hole 13A, a support rod 14 rotatably supported by a frame (not shown) located on the lower surface of the cabin 4 is provided, and an axial direction of the support rod 14 is provided. One end protrudes outward from the outer wall panel below the cabin 4, and a locking handle 15 is integrated with the shaft end as shown in FIG. The other end of the support rod 14 in the axial direction is integrated with an operation lever 16 described later. The operating lever 16 is swingably provided around the support rod 14 as a fulcrum.
A locking pin 18 is provided which fits into a long hole 17A formed in the locking piece 17. The locking piece 17 has a locking rod 17 </ b> B integrated on the lower surface and is supported so as to be vertically movable, and a locking handle 15 operable from outside the cabin 4.
In accordance with the operation direction of, as shown by the solid line and the two-dot chain line in FIG. In this embodiment, since the outer steps 8 are provided in two rows along the side surface of the cabin 4 as shown in FIG. 3, a holding mechanism is provided for each outer step 8. In this case, the locking handles 15 are arranged at the same location as shown in FIG. 3, and can be operated at the same location.

On the other hand, in each of the steps, the outer step 8 and the front step 9 are provided with handrail members 19, 20 as shown in FIG. Handrail members 19, 20
Is shown in FIG. 7 and subsequent figures. FIG. 7 shows the handrail member 19 provided on the outer step 8. The handrail member 19 is provided on the upper surface of the outer step 8 so that the handrail member can be folded and turned upside down. That is, the support pipe 19A and the handrail pipe 19B divided in the height direction as handrails are provided in the recesses of the lower surface frame 8A of the outer step 8.
Are stacked and housed. The support pipe 19A is
As shown in FIG. 3, it is a straight pipe as a support, and the handrail pipe 19B is, as shown in FIG. 3, a pipe having a part of the support and a handrail portion which is continuously laid horizontally. The support pipe 19A and the handrail pipe 19B are foldably connected by a hinge member 21 at the dividing position. As shown in FIG. 7, the hinge member 21 is attached to the support ring 23 'on the handrail pipe 19B side among the support rings 23 and 23' integrated near the division position between the support pipe 19A and the handrail pipe 19B. Each of the pipes 19A and 19B can be rocked by inserting a support pin 24, which is formed of an integrated plate member, and disposed at the tip end thereof into a receiving portion of the support ring 23 on the support pipe 19A side. Connected. Of the support rings 23, 23 ', the support ring 23 on the side of the support pipe 19A is integrated with the support pipe 19A with a space for inserting the shaft end of the handrail pipe 19B therein.
The support ring 23 'on the 9B side is provided with a combination of a guide hole and a guide pin for moving the handrail pipe 19B in a direction in which the shaft end of the handrail pipe 19B can be inserted into the support ring 23 on the support pipe 19A side. I have. For this reason, when extending from the folded state, the support pipe 19
Since the shaft end of the handrail pipe 19B can be inserted into the support ring 23 on the A side, the support pipe 19A and the handrail pipe 19B can stand upright via the support rings 23 and 23 '. Further, a swingable locking stay 25 having a notch formed at the swinging end is provided at an end of the support pipe 19A opposite to the dividing position, and the notch is formed as shown in FIG. The upright state and the folded state of the support pipe 19A and the handrail pipe 19B can be set by engaging and disengaging the pins 8A1 provided on the lower frame 8A.

As shown in FIG. 8, the handrail member 19 can be raised from a folded state. That is, the handrail member 19 in the folded state
FIG. 8 shows that the handrail pipe 19B is pulled up.
As shown in FIG. 8A, the handrail pipe 19B is lifted up in a bent state, and the end of the handrail pipe 19B is inserted into the support ring 23 on the side of the support pipe 19A with the divided positions facing each other.
It can stand upright as shown in FIG.

In FIG. 3, the handrail member 19 of the handrail member 19 located on the side of the windshield 4B of the cabin 4 has an upper end portion of the support pipe 19A and the handrail pipe 1A.
It extends above 9 and its shaft end is open. The shaft end of a handrail member 20 ′ which is horizontally installed at a corner of a handrail member 20 described later is inserted into this opening.

As shown in FIG. 3, the handrail member 20 is composed of a pair of upright pipes which stand upright on the upper surface of the front step 9, one of which forms a handrail portion as shown in FIG. One end of the horizontal pipe 20A in the longitudinal direction is pin-connected, and the other end of the handrail pipe 20 'for corner disposed above the corner step 9A is pin-connected to the other end. In FIG. 9, the corner handrail pipe 20 ′ has a bent portion in conformity with the plan view shape of the corner step 9 </ b> A, and the handrail member 20 has an end opposite to the pin-joined side. It is supported by being fitted into the locking portion 20B from above. In FIG. 9, the horizontal pipe 2
At the upper end of the handrail member 20 on the side opposite to the side where 0A is pin-coupled, there is formed a support piece 20C which is locked together with the support piece provided at the end of the horizontal pipe 20A. ing. Horizontal pipe 20A facing supporting piece 20C
Is retained by the support piece part.

The corner handrail 20 ′ is pulled out from the folded state toward the handrail member 20, as shown by a two-dot chain line in FIG. It is inserted into the shaft end opening of the handrail pipe 19B located on the 4B side to bridge between the handrail member 19 and the handrail member 20.

Since the present embodiment has the above configuration,
When the cabin 4 is located on the upper surface of the carrier 1A, the outer step 8 is stored in the cabin support frame 5, as shown in FIG. On the other hand, when the cabin 4 is extended to the side of the carrier 1A for crane work or when the cabin 4 is extended, an operator is provided on an operation panel 4A (see FIG. 3) located outside the cabin 4. By operating the drive switch, the outer step 8 can be extended. In this case,
When the drive switch is operated, the electric motor 12 rotates in a direction in which the outer step 8 can protrude to the side of the cabin 4. When the electric motor 12 rotates, the forward / backward driving roller 1
1 is driven, and the lower surface frame 8 </ b> A of the outer step 8 in contact with the roller 11 is pulled out in conjunction with the rotation of the roller 11. When the outer step 8 is pulled out and extended, it is held in that state by the holding mechanism shown in FIG.

On the other hand, after the outer step 8 is overhanged, a corner step 9A is arranged at the corner between the front step 9 and the outer step 8 by the operator. In this case, as shown in FIG. 3, the operator swings the corner step 9 </ b> A folded on the upper surface of the outer step 8 so as to project toward the outer step 9 and makes the corner step 9 </ b> A flush with the front step 9. The auxiliary step 9B (see FIG. 3) is further swung from a part thereof toward the outer step 8 and placed on the upper surface of the outer step 8. Thus, the periphery of the cabin 4 is surrounded by the inner step 7, the outer step 8, the front step 9, and the corner step 9A. Each step is extended to a width that allows the operator to walk, and the swivel 3 is used for the carrier 1A.
When turning at the upper part of the carrier, a part of any of the steps has a length that is located near the upper surface of the carrier 1A.
4, the operator can move from the cabin 4 toward the carrier 1A irrespective of the turning position of the turntable 3, as indicated by a chain line arrow. In particular, when the opening / closing door of the cabin 4 is located on the front side in the extending direction of the cabin 4, the process proceeds to the inner step 7 via the outer step 8, the corner step 9A and the front step 9, and the upper surface of the carrier 1A is formed. You can move on.

When the outer step 8 is extended, the handrail member 19 is erected, and in the front step 9, the corner handrail 20 'is assembled in addition to the handrail member 20. In this case, the handrail member 19 is lifted up in a bent state as shown in FIG. 8A by pulling up the handrail pipe 19B from the state of being folded in the lower surface frame 8A, so that the divided positions face each other. By inserting the shaft end of the handrail pipe 19B into the support ring 23 on the side of the support pipe 19A, the handrail pipe 19B stands upright as shown in FIG. 8B.

On the other hand, as shown in FIG. 9, the handrail member 20 located on the front step 9 side has a horizontal pipe 20A stretched over the upper end of the handrail member 20, and the corner pipe 2
0 'is pulled out, and its swinging end is inserted into one shaft end opening of the handrail pipe 19B of the handrail member 19, whereby the swinging end is laterally suspended between the front step 9 and the corner step 9A.

According to the above embodiment, in a crane having a structure in which the cabin projects laterally, it is possible to use the existing cabin without changing the position of the open / close door of the cabin. That is, in the case of a structure in which the cabin protrudes laterally, it is preferable to provide an opening / closing door on the side of the carrier 1A in order to facilitate the getting on / off operation. There is a need to. However, in this embodiment, by providing the outer step 8 corresponding to the position of the opening and closing door of the existing cabin, the existing cabin can be used as it is without changing the position of the opening and closing door of the cabin 4. Thereby, the common use of the cabin structure can be achieved, so that it is possible to prevent the processing and component management costs related to the change in the specifications of the cabin 4 from increasing.

[0027]

As is apparent from the above embodiments, according to the first and third aspects of the present invention, the driving source is driven by operating the switch from outside the crane operating driver's seat to operate the crane. It is possible to set the overhanging position and the retracting position so that the steps located around the driver's seat, especially the side steps are extended to the width that can be walked, requiring labor for manual operation by the operator when the steps are overhanging and retracting. And not. In addition, the steps at the overhang position are set to a width that allows the user to walk instead of simply putting their feet on them, so that the operator can freely move around the crane operation driver's seat, and the operator can operate the crane operation. It is possible to easily move between the seat and the carrier. In addition, since the steps, especially the steps located on the sides and the front of the crane operating driver seat, are provided with handrail members, the safety when the operator moves around, especially the crane operating Safety at the side of the driver's seat can be ensured. This makes it easy and safe to get on and off and move from the crane operation driver's seat.

According to the second aspect of the invention, when the crane operation driver's seat turns along with the turning of the crane, any one of the steps at the side of the operator's seat, the front portion, and the position opposite to the side. Since the part can overlap the upper surface of the carrier part, getting on and off the operator's seat for operating the crane can be performed from the overlapping place. Accordingly, it is possible to perform the getting on / off and moving operation regardless of the turning position.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a mobile crane according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a lower surface of a cabin support for explaining a configuration of steps used in the mobile crane according to the embodiment of the present invention.

FIG. 3 is a perspective view for explaining details of a structure of a cabin supporting portion that supports a crane operation driver seat shown in FIG. 2;

FIG. 4 is a schematic diagram for explaining a positional relationship between a turning position of a swivel base of the mobile crane shown in FIG. 1 and a step shown in FIG. 2;

FIG. 5 is a partial perspective view for explaining a moving mechanism of a step located on a side of a cabin supporting portion that supports a crane operation driver seat in the steps shown in FIG. 2;

6 is a partial perspective view for explaining a step position holding mechanism used in the step moving mechanism shown in FIG. 5;

FIG. 7 is a partial perspective view illustrating the configuration of a handrail member used in the steps shown in FIG. 5;

FIG. 8 is a side view for explaining the operation of the handrail member shown in FIG. 7;

9 is a partial perspective view illustrating a configuration of a handrail member used in a step located in front of a crane operation driver's seat in the steps shown in FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 All-terrain clean which is one of mobile cranes 1A carrier 3 Turning table 4 Cabin equivalent to a driver's seat for crane operation 4A Operation unit equipped with a drive switch 5 Cabin support frame 7 Inside step 8 Outside step 8A Lower frame 9 Front side step 9A Corner step 11 Forward and backward movement drive roller 12 Electric motor 19, 20 Handrail member 19A Support pipe 19B Handrail pipe 20 'Corner handrail 20A Horizontal pipe

Claims (3)

[Claims] 1. A mobile crane having a crane operation driver seat separately from a traveling operator seat on a swivel mounted on a carrier unit so as to be pivotable on an upper surface thereof, wherein the crane operation driver seat protrudes laterally. A step that can be moved to an overhang position on the side of the crane operation driver seat and a storage position on a lower surface of the crane operation driver seat; and a handrail member that can be turned upside down on the upper surface of the step. The step is movable between an overhang position and a storage position where the handrail member is driven by an installed drive source and overhangs a walkable width, and the handrail member can be raised at the overhang position. Mobile crane characterized by the following. 2. The mobile crane according to claim 1, wherein the step is provided at a position in front of the operator's seat and at a position opposite to the side in addition to the side of the operator's seat for operating the crane. The steps provided at the front portion and the side opposite to the side are provided in advance integrally with the driver's seat, and the step at the side of the driver's seat and the step integrated with the driver's seat in advance are provided. A mobile crane characterized in that a part of any of the above is located near the upper surface of the carrier part when the driver's seat turns. 3. The mobile crane according to claim 1, wherein the handrail member is disposed at a position surrounding a front side portion and a position opposite to the side of the crane operation driver's seat. Mobile crane characterized.