JP6649638B2 - Work machine - Google Patents

Description

  The present invention relates to a working machine such as a crane or shovel provided with a lower traveling body having a crawler, a post, and an upper rotating body.

  BACKGROUND ART Conventionally, as a working machine such as a crane, there has been known a work machine including a lower traveling body having a pair of crawlers, a post provided on the lower traveling body, and an upper revolving superstructure provided on the post. In this type of work machine, the upper revolving unit is located at a high position, and therefore, an ascending / descending stair for climbing to the upper revolving unit may be provided. For example, Patent Document 1 discloses a crane provided with a ladder device for climbing to a side step on an upper rotating body.

JP-A-9-278365

  The ladder device related to the construction machine described in Patent Literature 1 stores the ladder in a storage position by an electric winch as a driving device in order to prevent the ladder from interfering with the surroundings when the upper revolving unit of the crane turns. It is provided with the configuration. Therefore, it is necessary to lower the ladder to the elevating position at the start of the turning operation of the upper revolving unit and raise the ladder to the retracted position at the end of the turning operation. Further, when an electrical trouble occurs, the ladder cannot be lowered from the storage position to the elevating position, so that the operator may not be able to get off the upper revolving unit.

  During the turning operation, the upper revolving superstructure may face not only in the same direction as the lower traveling structure but also in the rear or side. Therefore, the part of the lower traveling body where the lowermost stage of the ladder faces, that is, the location where the operator moves from the ladder to the lower traveling body changes according to the turning angle of the upper rotating body. Further, the lower traveling body has various components such as a car body for supporting the post, and driving means provided on the left and right sides of the car body. For this reason, depending on the orientation of the upper revolving structure with respect to the lower traveling structure, the portion of the lower traveling structure facing the lowermost stage of the ladder may not be suitable as a place for the worker to move. In this case, in order to safely descend using a ladder from the upper revolving structure to the lower traveling structure at the end of the revolving work, it is necessary for the operator to operate the upper revolving structure from the direction in which the upper revolving structure is facing at the end. In some cases, the upper revolving superstructure needs to be largely turned so that the direction in which the seat faces is in front of the lower traveling structure. However, in the construction machine described in FIG. 11 of Patent Document 1, no consideration is given to the relationship between the orientation of the upper revolving structure with respect to the lower traveling structure and the position of the ladder.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not require the stairs provided on the upper revolving unit to be stored during the turning work of the upper revolving unit. The turning range of the upper revolving body can be suppressed from increasing, and the operator can use the ascending and descending stairs without having to revolve the upper revolving superstructure at the end of the revolving work. An object of the present invention is to provide a working machine that can safely move between a lower traveling structure and an upper revolving structure.

  (1) A working machine according to the present invention is provided with a lower traveling body having a car body and a pair of crawlers arranged on the right and left sides of the car body and extending in the front-rear direction, and provided on the car body, A post having an upper end located at a position higher than the body, and an upper turn having a driver's seat, being provided at the upper end of the post and supported by the post so as to be able to turn with respect to the lower traveling structure. And a climbing stair provided on the upper revolving structure, having a shape extending obliquely downward from the upper revolving structure toward the lower traveling structure, and revolving with the turning operation of the upper revolving structure. . The upper revolving superstructure has a front working posture in which the direction of the driver's seat faces forward of the lower traveling structure and a rear working posture in which the direction of the driver's seat coincides with the rear of the lower traveling structure. And a right working posture in which the direction of the driver's seat faces the right of the lower traveling body, and a left working posture in which the direction of the driver's seat faces the left of the lower traveling body. It is configured as follows. The stepping member located at the lowermost step of the climbing stairs is an edge extending in the width direction of the climbing stairs and a leading edge located in a direction facing the driver's seat, and an edge extending in the width direction of the climbing stairs. And a rear edge located opposite to the front edge. In the working machine, when viewed in a plan view, the whole of the elevating staircase is located at a position overlapping with the upper revolving superstructure. Further, in the work machine, in any of the front work posture, the rear work posture, the right work posture and the left work posture, the work machine can move between the tread member and the upper surface of the crawler. Thus, at least a central portion of the leading edge is located at a position overlapping one of the pair of crawlers when viewed in a plan view.

  In the present invention, the climbing stairs have a shape extending obliquely downward from the upper swing body toward the lower traveling structure, and swing with the swing operation of the upper swing body. However, the entire climbing stairs are viewed in plan. Sometimes it is in a position that overlaps the upper revolving superstructure. Therefore, even if the lifting stairs are not stored during the turning operation, the turning range of the lifting stairs when viewed in plan does not become larger than the turning range of the upper turning body. Therefore, it is possible to suppress an increase in the swivel range of the elevating staircase that rotates with the turning of the upper revolving structure without storing the elevating stairs provided in the upper revolving structure at the time of the turning work of the upper revolving structure. .

  Since the upper surface of the crawler of the lower traveling body is substantially flat over the entire surface, the crawler is used when the worker moves between the step member located at the lowermost step of the ascending and descending stairs and the upper surface of the lower traveling body. Suitable as. The tip edge of the stepping member located at the lowermost step is the last scaffold when the worker moves from the elevating stairs to the upper surface of the crawler of the lower traveling body when descending the elevating stairs. Is the first scaffold when the worker moves from the upper surface of the crawler of the lower traveling body to the climbing stairs.

  In the present invention, when viewed in a plan view, even when the upper revolving structure is in any of the forward working posture, the backward working posture, the right working posture, and the left working posture, the upper revolving body is positioned at the lowest step of the ascending and descending stairs. At least the center of the leading edge of the stepping member to be moved is located at a position overlapping one of the pair of crawlers. Therefore, even when the upper revolving superstructure is in any of the above four postures, the worker can safely move from the substantially central portion of the leading edge to the upper surface of the crawler of the lower traveling substructure below it. It is possible to safely move from the position of the upper surface of the crawler of the lower traveling body corresponding to the substantially central portion of the leading edge to the lowermost stepping member located thereon.

  Therefore, the worker only slightly adjusts the orientation of the upper revolving unit so that the upper revolving unit is in a posture close to the direction of the upper revolving unit at the end of the revolving operation, that is, any of the above four postures. The climbing stairs can be used to safely descend from the upper revolving structure to the upper surface of the crawler. Then, at the start of the next revolving operation, the upper revolving unit is in one of the four positions adjusted at the end of the previous revolving operation, so the operator adjusts the direction of the upper revolving unit. Without using the climbing stairs, it is possible to safely climb from the upper surface of the crawler to the upper rotating body.

  (2) In the work machine, when viewed in a plan view, in any of the front work posture and the rear work posture, the entire front end edge is at a position overlapping one of the pair of crawlers. Is preferred.

  In this configuration, in the forward working posture and the rear working posture, even if the position at which the worker moves up and down the elevating stairs is shifted from the center in the width direction of the elevating stairs, the worker can move up and down the stairs. Of the lower traveling body and the upper surface of the crawler of the lower traveling body can be safely moved.

  (3) In the working machine, in a plan view, in any of the right working posture and the left working posture, a position where the entire front edge overlaps with one of the pair of crawlers. Is preferred.

  In this configuration, in the right working posture and the left working posture, even when the position at which the worker moves up and down the elevating stairs is shifted in the width direction from the center in the width direction of the elevating stairs, The movement between the step member located at the lowermost step of the elevating stairs and the upper surface of the crawler of the lower traveling body can be safely performed.

  (4) In the working machine, when viewed in a plan view, in any of the right working posture and the left working posture, the entirety of the rear edge is the post and the pair of crawlers in the left-right direction. Of the crawler located in the left-right direction and extending in the front-rear direction with respect to the outer edge of the crawler located in the left-right direction and extending in the front-rear direction. Preferably, it is located near the inner edge.

  In this configuration, in any of the right working posture and the left working posture, the entire rear end edge of the stepping member located at the lowest stage is located between the post and the crawler in the left-right direction. The entire tip edge of the stepping member is arranged at a position overlapping the crawler and closer to the inner edge than the outer edge of the crawler. That is, the rear edge of the stepping member is not located at the position overlapping with the crawler but at a position shifted inward in the left-right direction with respect to the crawler. , It is possible to increase the distance between the leading edge of the stepping member and the outer edge of the crawler when viewed in a plan view. That is, on the upper surface of the crawler, a region from the position corresponding to the leading edge of the stepping member (the position immediately below the leading edge) to the outer edge of the upper surface of the crawler can be secured as a foothold for the worker. Thereby, in any of the right working posture and the left working posture, the worker can safely move between the tread member located at the lowermost stage of the elevating stairs and the upper surface of the crawler of the lower traveling body. Can be done.

  (5) In the work machine, it is preferable that an upper end of the elevating stair is fixed to the upper revolving unit, and a lower end of the elevating stair is supported by the upper revolving unit by a support member.

  In this configuration, not only the upper end of the elevating stair is fixed to the upper revolving superstructure, but also the lower end of the elevating stair is supported by the upper revolving superstructure by the support member. It is possible to suppress the occurrence of rattling and vibration when turning in accordance with the operation.

  (6) In the working machine, it is preferable that the support member has a rod-shaped portion for an operator to grip, and the cross-sectional shape of the rod-shaped portion is circular or oval.

  In this configuration, when the worker moves between the stepping member located at the lowest stage of the ascending and descending stairs and the crawler of the lower traveling body, a bar-shaped portion having a circular or elliptical cross section is used as a handrail. Therefore, the safety at the time of raising and lowering the worker can be further improved.

  (7) In the working machine, it is preferable that the support member is provided with a gripping member for an operator to grip.

  In this configuration, a gripping member is provided on the support member separately from the support member. Thus, the material forming the support member and the material forming the gripping member can be different. Specifically, for example, the supporting member is made of a material (for example, a rigid metal material or the like) having a function of suppressing rattling or vibration of the ascending and descending stairs. It is possible to use a material (for example, a synthetic resin or the like) which can be easily processed into an easy shape and has a function of preventing slippage.

  ADVANTAGE OF THE INVENTION According to this invention, even if it does not store the raising / lowering stairs provided in the upper revolving structure at the time of the revolving work of an upper revolving structure, it suppresses that the turning range of the raising / lowering stairs which rotates with the revolving upper revolving structure becomes large. In addition, even if the upper revolving superstructure is not largely turned to adjust the orientation of the upper revolving superstructure at the end of the revolving work, the worker can use the lifting stairs to move the lower revolving superstructure and the upper revolving superstructure. You can safely move between them.

It is a side view showing the work machine concerning an embodiment of the present invention, and shows the state when the work machine concerned is in a front work posture. It is a front view showing the work machine concerning an embodiment, and has shown the state when the work machine concerned is in a front work posture. FIG. 3 is a plan view for explaining a positional relationship among a lower traveling body, a post, an upper revolving superstructure, and a staircase in the working machine according to the embodiment, and shows a state when the working machine is in a forward working posture. It is the side view which expanded a part of working machine which concerns on embodiment. It is a side view showing the work machine concerning an embodiment, and shows the state when the work machine concerned is in the back work posture. FIG. 3 is a plan view for explaining a positional relationship among a lower traveling body, a post, an upper revolving superstructure, and an ascending / descending staircase in the working machine according to the embodiment, showing a state where the working machine is in a rear working posture. It is a rear view showing the work machine concerning an embodiment, and has shown the state when the work machine concerned is in the right work posture. FIG. 3 is a plan view for explaining a positional relationship among a lower traveling body, a post, an upper revolving superstructure, and a staircase in the working machine according to the embodiment, and shows a state when the working machine is in a right working posture. FIG. 3 is a plan view for explaining a positional relationship among a lower traveling body, a post, an upper revolving structure, and a staircase in the working machine according to the embodiment, and shows a state when the working machine is in a left working posture.

  Hereinafter, a working machine according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a work machine 1 according to the present embodiment. FIG. 2 is a front view showing the work machine 1 according to the embodiment. FIG. 3 is a plan view for explaining the positional relationship among the lower traveling unit 2, the post 3, the upper revolving unit 4, and the elevating stairs 6 in the work machine 1 according to the embodiment. FIG. 4 is an enlarged side view of a part of the work machine 1 according to the embodiment. In the drawings other than FIG. 1, members such as the boom 42 provided on the upper swing body 4 are not shown.

  As shown in FIGS. 1 to 3, the work machine 1 includes a lower traveling body 2, a post 3, an upper revolving superstructure 4, a lifting staircase 6, and an attachment 70. The front, rear, up, down, left, and right directions described in each drawing are based on the direction of the lower traveling body 2.

  The lower traveling body 2 is configured to be able to travel by itself. The lower traveling body 2 has a car body 21 and a pair of crawlers 22 (right crawler 22A and left crawler 22B) located on the right and left sides of the car body 21, respectively. The car body 21 supports the post 3 at the center. The pair of crawlers 22 are respectively attached to left and right sides of the car body 21 and support the car body 21.

  Each crawler 22 has an elongated shape extending in the front-rear direction from a front end 22F to a rear end 22R. Each crawler 22 includes an endless crawler belt 23, a crawler frame 24 to which the crawler belt 23 is attached, and a drive mechanism such as a traveling hydraulic motor (not shown) for rotating the crawler belt 23 around the crawler frame 24. . Since the crawler belt 23 has an upper surface 23A that is substantially flat over the entire surface, the crawler belt 23 is suitable as a scaffold when an operator moves between the lifting stairs 6 and the lower traveling body 2.

  The post 3 is for supporting the upper swing body 4 at a high position. The post 3 is provided on a car body 21 of the lower traveling body 2. The post 3 has a cylindrical shape, and a lower end portion is fixed on the car body 21 of the lower traveling body 2. The post 3 has an upper end portion 31 located higher than the car body 21.

  The upper revolving superstructure 4 is supported by the post so as to be rotatable around a rotation axis C in a vertical direction with respect to the lower traveling superstructure 2. The upper swing body 4 includes a swing frame 50, a cab 51 having a driver's seat 51A, a right side step 52 provided on the right side of the cab 51, and a left side step 53 provided on the left side of the cab 51. The cab 51 and the side steps 52 and 53 are provided on the turning frame 50. The turning frame 50 is attached to the upper part of the post 3 so as to be turnable.

  The right side step 52 and the left side step 53 function as a passage for an operator to move around the cab 51 in the upper swing body 4. The right side step 52 and the left side step 53 may be connected on the back side of the cab 51, for example. In this case, the right side step 52 and the left side step 53 can be moved back and forth.

  The attachment 70 is for performing a suspended load operation of the suspended load, and is provided on the upper swing body 4. The attachment 70 has a boom 42, a hanging rope 43, and a hook device 44. Further, the work machine 1 includes a not-shown hanging winch, a gantry 45, a guy line 46, an upper spreader 47, a lower spreader 48, an undulating rope 49, and an undulating unillustrated winch.

  The boom 42 is attached to the front part of the turning frame 50 so as to be able to undulate. The hook device 44 is suspended from the tip of the boom 42 via a suspension rope 43. The suspension winch is mounted on the turning frame 50. The lifting winch winds up and lowers the hook device 44 by winding and unwinding the hanging rope 43. The gantry 45 is provided upright at the rear of the turning frame 50. One end of the guy line 46 is connected to the tip of the boom 42, and the other end is connected to the upper spreader 47. The lower spreader 48 is provided at the upper end of the gantry 45. An undulating rope 49 is wound around the upper spreader 47 and the lower spreader 48. The hoisting winch is mounted on the turning frame 50. The hoisting winch reduces or increases the distance between the upper spreader 47 and the lower spreader 48 by winding and unwinding the hoisting rope 49, thereby raising and lowering the boom 42.

  The elevating stairs 6 are for moving between the lower traveling structure 2 and the upper revolving structure 4. Since the lifting / lowering stairs 6 are attached to the upper swing body 4, the lift stairs 6 swing with the swing operation of the upper swing body 4. In the present embodiment, the lifting stairs 6 are attached to a position corresponding to the right side step 52 in the turning frame 50 of the upper turning body 4. The operator can move up and down between the upper revolving unit 4 and the lower traveling unit 2 using the right side step 52 and the elevating stairs 6.

  As shown in FIGS. 1, 2 and 4, the elevating staircase 6 has a shape extending obliquely downward from the upper swing body 4 toward the lower traveling body 2. As shown in FIGS. 2 and 4, the ascending / descending stairs 6 include a plurality of step members 61 (step plates 61), a pair of side frames 62 supporting the step members 61 on both sides of the step members 61, and a side frame 62. And a handrail 63 attached to the handrail.

  As shown in FIG. 4, the upper end 6 </ b> A of the ascending / descending staircase 6 is fixed to the turning frame 50 of the upper turning body 4 by fixing means such as bolts 60. On the other hand, the lower end 6 </ b> B of the elevating staircase 6 is supported by the upper swing body 4 by the support member 71. The upper end of the support member 71 is fixed to the revolving frame 50 of the upper revolving unit 4 by fixing means such as bolts 60, and the lower end of the support member 71 is fixed to the lower end 6B of the ascending and descending stairs 6 by fixing means such as bolts 60. Fixed.

  As shown in FIG. 3, when viewed in plan, the lowermost step member 61 </ b> A of the plurality of step members 61 has a rectangular shape. The step member 61A located at the lowermost stage functions as the last scaffold when the worker moves from the elevating stairs 6 to the upper surface 23A of the crawler 22 of the lower traveling body 2 when descending the elevating stairs 6, and When the worker climbs from the upper traveling surface 23 </ b> A of the crawler 22 of the lower traveling body 2, it functions as a first scaffold.

  The stepping member 61 </ b> A located at the lowest stage has a leading edge 611 and a trailing edge 612 that extend in the width direction W of the elevating staircase 6. The leading edge 611 is an edge portion of the stepping member 61A located in the direction D of the driver seat 51A of the upper swing body 4 (the direction D when the worker sitting in the driver seat 51A faces the front), and the rear edge. Reference numeral 612 denotes an edge portion of the step member 61A located in a direction opposite to the direction D in which the driver's seat 51A of the upper swing body 4 faces.

  1 to 3 show a state when the work machine 1 is in a forward working posture. 5 and 6 show a state when the work machine 1 is in the rear working posture. 7 and 8 show a state when the work machine 1 is in the right working posture. FIG. 9 shows a state in which the work machine 1 is in the left work posture.

  As shown in FIGS. 1 to 9, the upper revolving superstructure 4 has a front working posture in which the direction D facing the driver's seat 51A coincides with the front of the lower traveling structure 2 and a direction D facing the driver's seat 51A during the revolving operation. The rear working posture corresponding to the rear of the lower traveling body 2, the right working posture where the direction D of the driver's seat 51 A faces to the right of the lower traveling body 2, and the direction D of the driver seat 51 A facing the lower traveling body 2 And a left working posture coinciding with the left side of the vehicle.

  3, 6, 8, and 9, a two-dot chain line 4 indicates a range where the upper swing body 4 exists when viewed in plan. When the work machine 1 is viewed in plan as shown in FIGS. 3, 6, 8 and 9, the lifting stairs 6 are moved with respect to the upper revolving Attached. In other words, the elevation stairs 6 are provided within a range occupied by the upper swing body 4, that is, inside the contour line (two-dot chain line 4) of the upper swing body 4 when viewed in a plan view.

  In the work machine 1, in the forward working posture shown in FIG. 3 and the rear working posture shown in FIG. 6, the upper end 6 </ b> A of the lifting stairs 6 is located at a position facing the post 3 in the left-right direction. The step member 61 </ b> A located at the lower stage is at a position that does not face the post 3 in the left-right direction. In the working machine 1, in the right working posture shown in FIG. 8 and the left working posture shown in FIG. 9, the upper end 6 </ b> A of the lifting stairs 6 is located at a position facing the post 3 in the front-rear direction. The step member 61 </ b> A located at the bottom of the stairs 6 is at a position that does not face the post 3 in the front-rear direction.

  In the work machine 1, when the work machine 1 is viewed in plan, any one of the front work posture shown in FIG. 3, the rear work posture shown in FIG. 6, the right work posture shown in FIG. 8, and the left work posture shown in FIG. In the posture described above, the entire front edge 611 of the stepping member 61 </ b> A located at the lowermost stage of the ascending / descending staircase 6 is located at a position overlapping one of the pair of crawlers 22. In other words, when viewed in a plan view, the entire leading edge 611 is provided within a range occupied by any one of the pair of crawlers 22, that is, inside the contour of any one of the pair of crawlers 22.

  In the forward working posture shown in FIG. 3 and the rear working posture shown in FIG. 6, the lifting stairs 6 are attached to the upper revolving unit 4 so that the width direction W is parallel to the left-right direction of the lower traveling unit 2. I have. Thereby, in the forward working posture shown in FIG. 3, it is possible to increase the interval between the leading edge 611 of the stepping member 61 </ b> A located at the lowest stage and the leading end 22 </ b> F of the crawler 22. That is, on the upper surface 23A of the crawler belt 23 of the crawler 22, a distance from a position corresponding to the leading edge 611 of the tread member 61A (a position immediately below the leading edge) to the leading edge 22F of the crawler 22 (the leading edge 22F of the crawler belt 23). The area can be secured as a foothold for the worker. Similarly, in the rear working posture illustrated in FIG. 6, it is possible to increase the distance between the leading edge 611 of the stepping member 61 </ b> A positioned at the lowermost stage and the rear end 22 </ b> R of the crawler 22, and the scaffold of the worker Can be secured.

  In the right working posture shown in FIG. 8 and the left working posture shown in FIG. 9, the lifting stairs 6 are attached to the upper revolving unit 4 so that the width direction W is parallel to the front-rear direction of the lower traveling unit 2. Have been.

  Further, when the work machine 1 is viewed in a plan view, the rear end edge 612 of the stepping member 61A located at the lowermost stage is in any of the right working posture shown in FIG. 8 and the left working posture shown in FIG. , The whole is located between the post 3 and one of the pair of crawlers 22 in the left-right direction. Specifically, it is as follows.

  8, a dashed line P indicates the position of the rightmost portion of the post 3 in the left-right direction, and in FIG. 9, a dashed line P indicates the position of the leftmost portion of the post 3 in the left-right direction. Things. Therefore, when the work machine 1 is viewed in a plan view, in the right working posture shown in FIG. 8, the rear end edge 612 of the stepping member 61A located at the lowest stage is entirely formed by the dashed line P and the inner edge of the right crawler 22A. 232. When the work machine 1 is viewed in a plan view, in the left working posture shown in FIG. 9, the rear end edge 612 of the stepping member 61 </ b> A located at the lowest stage is entirely formed by a dashed line P and an inner edge of the left crawler 22 </ b> B. 232.

  When the work machine 1 is viewed in a plan view, in the right working posture shown in FIG. 8, the tip edge 611 of the step member 61A located at the lowermost position is located at a position where the whole thereof overlaps the right crawler 22A. In the left working posture shown in FIG. 7, the tip edge 611 of the stepping member 61A located at the lowermost position is located at a position where the whole thereof overlaps the left crawler 22B. In other words, when viewed in a plan view, in the right working posture, the entire leading edge 611 is provided within the range occupied by the right crawler 22A, that is, inside the contour of the right crawler 22A, and the left working posture In, the entire front edge 611 is provided within a range occupied by the left crawler 22B, that is, inside the contour of the left crawler 22B.

  When the work machine 1 is viewed in a plan view, in the right working posture shown in FIG. 8, the leading edge 611 of the stepping member 61 </ b> A located at the lowermost position is inside the outer edge 231 of the crawler belt 23 of the right crawler 22 </ b> A. The leading edge 611 is located closer to the inner edge 232 than the outer edge 231 of the crawler belt 23 of the left crawler 22B in the left working posture shown in FIG.

  As shown in FIGS. 7 and 8, an outer edge 231 of the crawler belt 23 of each crawler 22 is an edge portion of the crawler belt 23 that is located outside in the left-right direction and extends in the front-rear direction. The inner edge 232 of the crawler belt 23 of each crawler 22 is an edge portion of the crawler belt 23 that is located inside the left-right direction and extends in the front-rear direction.

  In the right working posture and the left working posture, the rear end edge 612 of the stepping member 61A is not located at a position overlapping with the crawler 22 but at a position deviated inward in the left-right direction with respect to the crawler 22, and then the leading edge 611 is set. Is located at a position overlapping with the crawler 22 and close to the inner edge 232 of the crawler belt 23 of the crawler 22, so that the top edge 611 of the tread member 61 </ b> A and the crawler belt 23 of the crawler 22 when viewed in plan view. The distance between the outer edge 231 and the outer edge 231 can be increased. That is, on the upper surface 23A of the crawler belt 23 of the crawler 22, a region from a position corresponding to the leading edge 611 of the tread member 61A (a position immediately below the leading edge) to the outer edge 231 on the upper surface 23A of the crawler belt 23 is defined. , Can be secured as a foothold for workers.

  As shown in FIG. 2, the distance A between the tread member 61 </ b> A located at the lowermost stage and the crawler 22 is not particularly limited, but at least the central portion 611 </ b> C of the tip edge 611 of the tread member 61 </ b> A The dimension is set such that the operator can move between the stepping member 61A and the upper surface 23A of the crawler belt 23 of the crawler 22 without difficulty when positioned just above either one. In addition, the distance A is set to a size such that the elevating stairs 6 do not interfere with the lower traveling structure 2 during the turning operation of the upper rotating structure 4. Specifically, the distance A can be set to about several tens of cm (for example, about 50 cm).

  Further, in the present embodiment, as shown in FIG. 2, the lower traveling body 2 has a crawler step 211 provided on the crawler frame 24 so that the crawler 22 can easily go up from the ground G. The distance B from the crawler step 211 to the ground G is not particularly limited, but is set to a dimension that allows a worker to move between the ground G and the crawler step 211 without difficulty. Specifically, the distance B can be set to about several tens of cm (for example, about 40 cm).

  As shown in FIG. 4, the support member 71 according to the present embodiment is a rod-shaped member. The cross-sectional shape of the support member 71 is circular or elliptical, but is not limited thereto. For example, the cross-sectional shape of the support member 71 may be a polygon or a polygon such as a quadrangle with rounded corners. In the case of a polygon, it is preferable that the number of corners of the polygon is large from the viewpoint of ease of grasping when the operator grips the support member 71.

  The support member 71 that supports the elevating stairs 6 is made of a material (for example, a rigid metal material) having a function of suppressing rattling and vibration of the elevating stairs 6.

  The support member 71 may be provided with a gripping member 72 for an operator to grip. The gripping member 72 is attached to the supporting member 71 at a height at which an operator can grip the lifting stairs 6 by hand. The gripping member 72 is made of a material (for example, synthetic resin or the like) having a function of being easily processed into a shape that can be easily gripped by an operator and having a function of preventing slippage. In the present embodiment, the gripping member 72 is provided so as to cover the periphery of the support member 71, but is not limited thereto. The gripping member 72 may have, for example, a shape extending in a bar shape laterally from the support member 71.

[Modification]
The present invention is not limited to the embodiment described above. The present invention includes, for example, the following forms.

  In the above embodiment, when viewed in a plan view, the leading edge of the stepping member 61A located at the lowest step of the ascending and descending stairs 6 in any of the forward working posture, the backward working posture, the right working posture, and the left working posture. Although the case where the whole of 611 is located at a position overlapping with one of the pair of crawlers 22 is illustrated, the invention is not limited to this. When viewed in a plan view, in any of the front working posture, the rear working posture, the right working posture, and the left working posture, at least the central portion 611C of the leading edge 611 overlaps one of the pair of crawlers 22. It only has to be in position.

  In the above embodiment, the elevating stairs 6 extend obliquely downward and linearly, but are not limited to this. For example, the ascending and descending stairs 6 may be configured such that the direction extending obliquely downward changes halfway. Specifically, for example, the elevating staircase 6 may extend spirally obliquely downward.

  In the above-described embodiment, the case where the step member 61A located at the lowermost step has a rectangular shape when viewed in a plan view as shown in FIG. 3 is exemplified. However, the present invention is not limited thereto. A rod-shaped member extending in the direction W may be used. In this case, the tip edge 611 of the stepping member 61A is a portion corresponding to the line segment located in the direction D among the two line segments extending in the width direction W that define the tip edge 611 when viewed in a plan view. It is. The rear edge 612 of the stepping member 61A is a portion corresponding to a line segment located in a direction opposite to the direction D of the two line segments when viewed in a plan view.

  In the above-described embodiment, when viewed in a plan view, in any of the right working posture and the left working posture, the entire rear end edge 612 of the stepping member 61A located at the lowermost position overlaps the crawler 22. However, the position is not limited to the position between the post 3 and one of the pair of crawlers 22 in the left-right direction. However, the present invention is not limited to this.

  In the above-described embodiment, when viewed in a plan view, in both the right working posture and the left working posture, the entire distal end edge 611 of the stepping member 61A located at the lowest stage is located outside the crawler 22 in the left-right direction. The case where the outer edge 231 is located closer to the inner edge 232 than the outer edge 231 is exemplified. However, the present invention is not limited to this.

  In the above embodiment, the case where the lower end portion 6B of the elevating staircase 6 is supported by the upper revolving unit 4 by the support member 71 is illustrated, but the support member 71 may be omitted.

  In the above-described embodiment, the case where the ascending / descending stairs 6 are provided at the position corresponding to the right side step 52 of the revolving frame 50 is illustrated. However, the invention is not limited thereto. You may.

  In the above-described embodiment, the case where the work machine 1 is a crane including the lower traveling body 2 having the crawler 22, the post 3, and the upper swing body 4 is exemplified. However, the work machine 1 is not limited thereto. Another working machine such as a shovel including the lower traveling body 2 having the crawler 22, the post 3, and the upper rotating body 4 may be used.

REFERENCE SIGNS LIST 1 work machine 2 lower traveling body 3 post 4 upper revolving structure 6 elevating stairs 6A upper end of elevating stairs 6B lower end of elevating stairs 61 treading member of elevating stairs 61A treading member located at the lowest stage of elevating stairs 611 Tip edge of stepping member located at lower stage 611C Central portion of tip edge of stepping member located at bottom of stairs 612 Rear edge of stepping member located at bottom of stairs 21 Car body 22 Crawler 22A Right crawler 22B Left crawler 22F Front end of crawler 22R Rear end of crawler 23 Crawler belt 231 Outer edge of crawler located on outer side in left and right direction 232 Inner edge of crawler located on inner side in left and right direction 51A Driver's seat 51 Cab 71 Support member 72 Gripping member D Driver's seat Direction (direction when the operator sitting in the driver's seat is facing the front)
P Position of the end of the post in the horizontal direction W Width direction of the stairs

Claims (7)

A lower traveling body having a car body and a pair of crawlers disposed on the right and left sides of the car body and extending in the front-rear direction,
A post provided on the car body and having an upper end located at a higher position than the car body;
An upper revolving structure that has a driver's seat, is provided at the upper end of the post, and is supported by the post so as to be rotatable with respect to the lower traveling structure;
An ascending and descending staircase that is provided on the upper revolving structure, has a shape that extends obliquely downward from the upper revolving structure toward the lower traveling structure, and revolves with the revolving operation of the upper revolving structure.
The upper revolving superstructure has a front working posture in which a direction of the driver's seat faces forward of the lower traveling structure and a rear working posture in which a direction of the driver's seat coincides with the rear of the lower traveling structure during a turning operation. And a right working posture in which the direction of the driver's seat faces the right side of the lower traveling body, and a left working posture in which the direction of the driver's seat facing left of the lower traveling body. It is configured as
The stepping member located at the bottom of the climbing stairs is an edge extending in the width direction of the climbing stairs and a leading edge located in the direction facing the driver's seat, and an edge extending in the width direction of the climbing stairs. Having a rear edge located on the opposite side to the front edge,
When viewed in a plan view, the entirety of the climbing stairs is located at a position overlapping the upper swing body,
In any of the front working posture, the rear working posture, the right working posture, and the left working posture, the movable member was viewed in a plan view so as to be movable between the tread member and the upper surface of the crawler. A work machine, wherein at least a central portion of the leading edge is at a position overlapping one of the pair of crawlers.   2. The work according to claim 1, wherein when viewed in a plan view, in any of the front working posture and the rear working posture, the entire front end edge is located at a position overlapping with one of the pair of crawlers. machine.   3. The planar display device according to claim 1, wherein, when viewed in a plan view, in any of the right working posture and the left working posture, the entire front end edge is located at a position overlapping one of the pair of crawlers. 4. A working machine according to claim 1.   When viewed in a plan view, in any of the right working posture and the left working posture, the entire rear end edge is located between the post and one of the pair of crawlers in the left-right direction. Position, the entire front edge is located closer to the inner edge of the crawler extending in the front-rear direction and located inward in the left-right direction than the outer edge of the crawler located in the left-right direction and extending in the front-rear direction. The work machine according to claim 3. The upper end of the climbing stairs is fixed to the upper swing body,
The work machine according to any one of claims 1 to 4, wherein a lower end of the stairs is supported by the upper swing body by a support member.   The work machine according to claim 5, wherein the support member has a rod-shaped portion for an operator to grip, and a cross-sectional shape of the rod-shaped portion is circular or elliptical. The work machine according to claim 5, wherein the support member is provided with a gripping member for gripping by an operator.

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