JP2011241642A - Side step device of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side step device of a working machine, constituted to allow the width of outward projection thereof to be enlarged according to a request by different usage, standard, etc., have a small amount of downward protrusion, and be advantageous from the viewpoint of strength.SOLUTION: First frames 10 at the right and left of a first step 8 are mounted to a side face of the lower part of a revolving frame 3a so as to be slidable and retractable, and also fixably by fixing bolts 18. A first treadboard 11 is mounted between the right and left first frames 10, 10. One end of each side face of right and left second frames 14 of a second step 9 is articulated with each of the mutually facing faces of the right and left first frames 10 by a bolt 12 and fixably mounted to the first frame 10 by a fixing bolt 13 in a storage attitude in which the other end of the second frame 14 faces inwardly and in a protrusion attitude in which the other end faces outwardly. A second treadboard 15 is mounted between the right and left second frames 14, 14.

Description

  The present invention relates to a side step device that is attached to a side portion of an upper swing body of a work machine such as a hydraulic excavator or a dismantling machine and is used as a scaffold or a passage for an operator, a maintenance worker, etc. The present invention relates to a type side step device.

  The work machine installs a turning frame on a lower traveling body via a turning device, and a power unit and a cab are installed on the turning frame to form an upper turning body, and excavation, dismantling, cargo handling, etc. are performed on the turning frame. It is constructed with a working device attached. Also, on both sides of the upper swing body, a side step is installed for maintenance personnel to perform maintenance work on the load on the upper swing body such as a power unit or for the operator to use as a passage. As such a side step, in Patent Document 1, the rear side step is prevented from colliding with a surrounding obstacle during a turning operation and being damaged. A configuration in which the rear side step does not collide with an obstacle by being housed in a slide type or a flip-up type in the side step is disclosed.

JP 2005-155162 A

  As the working machine becomes larger, the width of the upper swing body becomes wider. For this reason, in a working machine provided with side steps on both sides of the upper swing body, the left and right widths of the upper swing body exceed the transport limit width on the road by the trailer truck with the side steps attached. When the above-described conventional side step device of a work machine is applied to a large work machine, the left and right width including the side step of the upper swing body is not reduced even if the rear side step is accommodated in the front side step. For this reason, it is difficult to adopt the structure of the conventional side step in a large working machine that frequently transports.

  In order to keep the left and right width of the upper swing body during transport within the transport limit width, it is conceivable that the side step is accommodated on the lower surface of the upper swing body so as to be slidable outwardly. However, the outward projecting width required for the side step varies depending on the work content at the work site and in-house standards.

  Moreover, when attaching a handrail to the outer edge part of a side step, the space for attaching a handrail is needed, and it is necessary to enlarge the protrusion width | variety of a side step by that much. However, the movable range accompanying the protrusion and the accommodation by the sliding of the side step is limited by the distance between the side surface of the upper swing body and the swing wheel of the swing device that rotates the upper swing body. For this reason, the case where it cannot respond to the request | requirement which enlarges the protrusion width | variety of a side step arises.

  In addition, the side step is configured so that the constituent members of the side step do not protrude downward in consideration of interference with the member at the time of turning with the lower traveling body below and the member attached to the track frame of the lower traveling body. It is necessary to. Moreover, since a side step is a person's ride, the strength which can bear the weight is requested | required.

  In view of the above-mentioned problems, the present invention can increase the outward protrusion width according to the demands of different applications and standards, has a small downward protrusion amount, and is advantageous in terms of strength. An object is to provide a side step device for a work machine.

The side step device of the working machine according to claim 1,
In the side step device of the work machine attached to the lower side of the upper swing body on the lower traveling body,
A first step comprising a left and right first frame and a first footboard fixed between the left and right first frames;
A second step comprising a second frame on the left and right and a second footboard fixed between the second frame on the left and right,
The first step can be slidably projected outward from the side surface at a lower side surface of the revolving frame of the upper revolving structure, and the left and right first frames can be fixed to the revolving frame by fixing bolts. Mounted on the
In the second step, one end side of the left and right second frames is pivotally attached to the mutually opposing surfaces of the left and right first frames in the first step, and the other side of the second frame. The second frame is attached to the first frame so as to be fixable by a fixing bolt in a housing posture in which the end side faces inward and a protruding posture in which the other end side faces outward.

The side step device for a work machine according to claim 2 is the side step device for a work machine according to claim 1,
A pivot member for pivotally coupling the second frame to the first frame is screwed into a screw hole provided on an opposing surface of the first frame, and the second frame is joined to the first frame. Consisting of bolts to be fastened,
The fixing bolt for fixing the second frame to the first frame in a housing posture and a protruding posture other than the pivotally attached portion of the second frame is a fixing bolt that is also used for fixing in each posture. It is characterized by that.

The side step device of the working machine according to claim 3 is the side step device of the working machine according to claim 1 or 2,
The second tread plate is detachably attached to the second frame with a fixing bolt.

The side step device for a work machine according to claim 4 is the side step device for a work machine according to any one of claims 1 to 3,
The first frame has guide grooves that are long in the inner and outer directions of the upper swing body and penetrate vertically.
A guide block is fitted into the guide groove so as to be relatively slidable,
The first frame is sandwiched between a mounting portion having a screw hole provided on the lower surface of the swivel frame and a lower plate contacting the lower surface of the first frame, and is provided on the lower plate and the guide block. By inserting a fixing bolt from below into the bolt insertion hole, screwing it into the screw hole of the mounting portion, and loosening the fixing bolt, the first frame can move inward and outward with respect to the turning frame, and the fixing The first frame is fixed to the swivel frame by fastening a bolt.

  According to the first aspect of the present invention, the first step is set in the storing posture during transportation, and the second step is set in the storing posture in which the tip of the second frame faces inward, so that the step device is the upper swing body. Thus, the left and right widths of the upper swing body including the step device can be kept within the transport limit width. Moreover, in this accommodation posture, since the second step overlaps the first step with the folding structure, the width in the inner and outer directions of the entire step is narrowed, and the step device is accommodated between the side surface of the upper swing body and the swing wheel. be able to.

  Further, when the work is performed on site, the first step can be used as a scaffold or a passage on which an operator or maintenance staff can get on by setting the first step to the protruding posture. Furthermore, by rotating the second frame with respect to the first frame and fixing with a fixing bolt as an outward projecting posture, the projecting width of the second step is added to the projecting width of the first step. Wide steps can be constructed. For this reason, it is possible to meet the demand for widening the side step according to the work content at the work site, internal standards, or the like. Further, since the amount of downward projection of the second step is small in the accommodated posture, there is no possibility that the side step comes into contact with the lower traveling body or the like when the upper turning body turns. Further, if the second frame is configured to slide and extend side by side with respect to the first frame, it is necessary to delete the ribs of the first tread plate. In addition, by adopting a configuration in which the posture of the second frame is changed, it is possible to configure without deleting the ribs of the first frame, which is advantageous in terms of strength.

  According to the second aspect of the present invention, since the pivot member is constituted by a bolt, the bolt can also be used as a member for fixing the second frame to the first frame in the housing posture and the projecting posture. it can. In addition, since the fixing bolts that fix the portions other than the pivotally attached portion of the second frame in the housing posture and the protruding posture are used in the respective postures, the fixing bolts are always fixed in any posture. Used, no need for storage and no risk of loss. Further, since the second frame can be fixed with two bolts, the number of fixing members can be reduced.

  According to the invention of claim 3, since the second tread plate is detachably attached to the second frame by the bolt, the second tread plate is removed during transportation to remove the first tread of the second frame. The attachment / detachment work to the frame can be performed. For this reason, it is not necessary for the maintenance staff to support the second frame with one hand, and to support the load on the second tread when the other hand rotates or removes the bolt. It becomes easy and the safety is improved.

  According to the invention of claim 4, since the fixing bolt for fixing the first frame to the revolving frame is inserted into the bolt insertion hole of the guide block fitted in the guide groove of the first frame, The fixing bolt does not contact the wall surface of the guide groove of the first frame. For this reason, it can prevent that the wall surface of the guide groove of a 1st flame | frame is damaged with the thread of a fixing bolt, or rust generate | occur | produces on a fixing bolt by the damage of a thread.

It is a top view of the upper revolving structure which shows one embodiment of the side step device of the working machine of the present invention in the protruding posture which set the side step to the widest width. It is the elements on larger scale of FIG. It is a front view which shows the side step of this Embodiment by the protrusion attitude | position which set the widest. It is sectional drawing of the side step apparatus of this Embodiment. It is a disassembled perspective view which shows the structure of the 1st flame | frame of this Embodiment. It is a disassembled perspective view which shows the attachment structure of the 2nd frame with respect to the 1st frame of this Embodiment, and the attachment structure of the 2nd step board with respect to the 2nd frame. It is a top view of the upper turning body which shows the state which accommodated the side step of this Embodiment. It is FIG. 3 equivalent view which shows the state which accommodated the side step of this Embodiment. It is a top view of the upper turning body which shows the state which made only the 1st step of this Embodiment protrude. It is a top view of the upper turning body which shows the state which made the 1st step and 2nd frame of this Embodiment protrude. It is sectional drawing which shows the 1st comparative example of this invention. It is sectional drawing which shows the 2nd comparative example of this invention.

  FIG. 1 is a plan view of an upper swing body of a working machine showing an embodiment of a side step device of the present invention, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is the widest side step of the embodiment. FIG. As shown in FIG. 3, this working machine is configured by installing a turning frame 3 a of an upper turning body 3 via a turning device 2 on a track frame 1 a of a crawler type lower traveling body 1 as shown in the figure. To do. As shown in FIG. 1, a bracket 4 for attaching a working device (not shown) is provided on the revolving frame 3a. The working device includes a multi-joint front, a non-expandable or telescopic arm, etc. attached to the tip with a bucket, a dismantling crushing tool, or a working tool used for cargo handling work. The swivel frame 3a is equipped with a cab 5 and a hydraulic power unit 6 including a fuel tank 6a, a hydraulic oil tank 6b, a power source (including an engine, a hydraulic pump, various cooling devices, etc.) 6c and the like. . A counterweight 7 is mounted on the rear part of the turning frame 3a.

  A plurality of first steps 8 and second steps 9 serving as scaffolds and passages for operators and maintenance personnel are attached to both sides of the turning frame 3a. FIG. 4 is a cross-sectional view showing the first step 8 and the second step 9 (however, a second tread plate 15 described later is omitted). As shown in FIGS. 2 and 4, the first step 8 is attached to the left and right first frames 10 and 10 by bolting or welding as shown in the drawing between the first frames 10 and 10. The first tread plate 11 is used. The first tread plate 11 has a reinforcing rib 11a protruding on the lower surface.

  As shown in FIG. 2, the second step 9 includes a second frame 14, 14 attached to the opposing surface 10 a of the left and right first frames 10, 10, and the second frame 14, 14. And a second tread plate 15 fixed between the two. In this embodiment, the second tread plate 15 is structured to be detachably fixed to the second frame 14 by a fixing bolt 16 by the structure described later.

  FIG. 5 is an exploded perspective view showing the structure of the first frame 10. As shown in FIG. 5, the first frame 10 has a guide groove 10 b that is long in the inner and outer directions of the upper swing body 3 and penetrates vertically. A rectangular guide block 17 is fitted into the guide groove 10b so as to be relatively slidable. The guide block 17 is provided with two bolt insertion holes 17a through which the fixing bolts 18 are inserted. A lower plate 19 is applied to the lower surface of the first frame 10 and has a bolt insertion hole 19a through which the fixing bolt 18 is inserted. On the other hand, as shown in FIG. 3, a mounting portion 20 having a smooth contact surface with the first frame 10 is provided on the lower surface of the turning frame 3 a, and a screw hole 21 is provided in the mounting portion 20.

  As shown in FIG. 3, the first frame 10 is attached to the revolving frame 3 a by bringing the lower plate 19 into contact with the lower surface of the first frame 10 and between the lower plate 19 and the attachment portion 20. The first frame 10 is sandwiched, the fixing bolt 18 is inserted from below into the bolt insertion holes 19a, 17a provided in the lower plate 19 and the guide block 17, respectively, and screwed into the screw hole 21 of the mounting portion 20. 1 frame 10 is attached to the lower surface of the revolving frame 3a. Then, by loosening the fixing bolt 18, the first frame 10 can move in and out of the revolving frame 3a. By fastening the fixing bolt 18, the first frame 10 is fixed to the revolving frame 3a. .

  FIG. 6 is an exploded perspective view showing an attachment structure of the second frame 14 to the first frame 10 and an attachment structure of the second tread plate 15 to the second frame 14. As shown in FIGS. 5 and 6, screw holes 22 for screwing the bolts 12 pivotally attached to the second frame 14 are provided on the opposing surfaces 10 a of the left and right first frames 10. Further, the fixing bolt 13 is screwed in the projecting posture and the housing posture of the second frame 14 at a position on the opposing surface 10a of the first frame 10 that is equidistant inward and outward with the screw hole 22 in between. Screw holes 23 and 24 for fixing the second frame 14 are provided.

  The second frame 14 has a vertical plate portion 14a that faces and abuts the facing surface 10a of the first frame 10, and a reinforcing horizontal plate portion 14b that is formed by bending the vertical plate portion 14a laterally. And a reinforcing vertical plate portion 14c formed by bending the front end of the horizontal plate portion 14b vertically, and a tread plate mounting portion 14d provided by welding to the vertical plate portions 14a and 14c. The vertical plate portion 14a is provided with bolt insertion holes 25 and 26 through which the bolts 12 and 13 are inserted, respectively. A bolt insertion hole 14e for inserting the fixing bolt 16 is provided in the tread plate attaching portion 14d, and a nut 27 is fixed by welding at a position concentric with the bolt insertion hole 14e.

  The second tread plate 15 is welded with a reinforcing rib 15a on the lower surface, and is provided with a vertical plate portion 15b provided so as to protrude upward and downward at a position on the outer side in the protruding posture of the second step 9. In addition, bolt insertion holes 28 for inserting the fixing bolts 16 are provided at both ends of the second tread plate 15 in the longitudinal direction. Both ends of the second tread plate 15 are placed on the tread plate mounting portions 14d of the left and right second frames 14, and the fixing bolts 16 are inserted into the bolt tapping holes 28 and 14e of the second tread plate 15 and the tread plate mounting portion 14d. By being screwed onto the nut 27, the second frame 14 is detachably attached.

  The first tread plate 11 and the second tread plate 15 are provided with attachment holes or screw holes for attaching handrails as necessary. The second tread plate 15 is provided with a mounting hole for attaching a suspension ring for lifting with a crane at the time of assembly and disassembly.

  Since the side step device of this embodiment is configured in this way, the accommodation posture in which the first step 8 does not protrude from the swivel frame 3a by loosening the fixing bolt 18 that fixes the first frame 10. Can be changed between the projecting posture and the projecting posture.

  In FIG. 4, the bolts 12 and 13 are respectively inserted into the bolt insertion holes 25 and 26 of the second frame 14, and are respectively screwed into the screw holes 22 and 23 of the first frame 10 and fastened. When the bolt 12 is loosened and the fixing bolt 13 is removed from the protruding posture, the second frame 14 can be rotated around the bolt 12. Then, the second frame 14 is rotated about the bolt 12 as indicated by an arrow R, and the second frame 14 is overlapped on the side of the first frame 10 as shown by a two-dot chain line to obtain a housing posture. The fixing bolt 13 is inserted into the bolt insertion hole 26 of the second frame 14 and screwed into the screw hole 24 to be fastened. The bolt 12 is fastened to fix the second frame 14 to the first frame 10. It can be overlapped and fixed on the side.

  For this reason, as shown in FIGS. 7 and 8, the second frame 14 is overlapped on the side of the first frame 10 and fixed with bolts 12 and 13, and the first step 8 is performed under the swivel frame 3a. By adopting the housing posture positioned at the position, the side step can be prevented from protruding outward from the upper swing body 3. For this reason, the upper turning body 3 does not exceed the transport limit width due to the presence of the side step. In this embodiment, the second tread plate 15 of the second step 9 is separated from the second frame 14 and transported.

  When assembling on-site after transportation, as shown in FIG. 9, the first step 8 is pulled out with the second frame 14 overlaid on the side of the first frame 10 and secured with the bolts 12 and 13. By fixing to the revolving frame 3a with the fixing bolt 18, a side step having a protruding width of the first step 8 can be configured.

  Next, when the side step is wider than the first step 8, the bolt 12 is removed from the state where the second frame 14 is overlapped on the side of the first frame 10, as shown by a two-dot chain line in FIG. 4. 1, loosen the fixing bolt 13, turn the second frame 14 in the opposite direction of the arrow R to the solid line projecting posture, and pass the fixing bolt 13 through the bolt insertion hole 26 of the second frame 14. 10, the second frame 14 can be fixed to the first frame 10 in a projecting posture, as shown in FIG. 10.

  Subsequently, as shown in FIGS. 1 and 2, the second step plate 15 is placed on the left and right second frames 14 and 14 and fixed by the fixing bolts 16, so that the side step has the widest configuration. Can do. The side step posture change and the second stepping plate 15 attachment / detachment work are performed so that the work area of the side step is between the left and right crawler belts and wheels so that the crawler belts and wheels of the lower traveling body 1 do not interfere with the work. The upper swing body 3 is swung so as to be positioned.

  As described above, according to this embodiment, the step device protrudes from the upper swing body by setting the first step 8 in the housing posture and the tip of the second frame 14 inward during transportation. The left and right widths of the upper swing body including the step device can be kept within the transport limit width. Moreover, at the time of work on-site, by setting the first step 8 to the protruding posture, it can be used as a scaffold or a passage on which an operator or a maintenance person gets.

  Furthermore, the second step 14 has the second step 9 in the first step 8 by fixing the second frame 14 to the first frame 10 in a projecting posture and fixing the second step plate 15 to the second frame 14. A wide side step having a protruding width including the second tread plate 15 can be configured. For this reason, it is possible to meet the demand for widening the side step when the work contents at the work site, in-house standards, or when attaching a handrail to the outer edge portion of the side step.

  11 and 12 are reference examples in which the side step has a two-stage slide structure, unlike the present invention. FIG. 11 shows an example in which the second frame 14A is slidably attached to the lower surface of the outer end portion of the first frame 10 so as to protrude and retract. That is, an attachment portion 10c for attaching the second frame 14A is provided on the outer end side of the first frame 10, and the second frame 14A having the same structure as the first frame 10 shown in FIGS. Are inserted into the guide block 30 so as to be movable, the second frame 14A is sandwiched between the mounting portion 10c and the lower plate 31, and the fixing bolts 32 are provided in the lower plate 31 and the guide block 30, respectively. It is inserted into 31a, 30a and screwed into a screw hole 10d provided in the mounting portion 10c.

  In the structure of FIG. 11, when the fixing bolt 32 is loosened, the second frame 14 can protrude and retract with respect to the first frame 10. However, according to the configuration of FIG. 11, since the second frame 14A protrudes further downward than the first frame 10, the overall downward protrusion width becomes large, which may interfere with the lower traveling body 1 during turning. It is difficult to realize. In addition, a step is generated between the tread plate attached to the first frame 10 and the tread plate attached to the second frame 14A. Further, since the mounting portion 10c of the guide block 30 of the first frame 10 limits the movable range of the first frame 10, the distance L between the outer surface of the turning frame 3a and the turning wheel 2a of the turning device 2 (see FIG. 8). ) Cannot ensure a large protrusion width of the first frame 10.

  On the other hand, according to the above-described embodiment of the present invention, as shown in FIGS. 3 and 8, the second frame 14 is far below the first frame 10 in the projecting posture and the housing posture of the second frame 14. The second tread plate 15 can be easily arranged on the same surface on the first tread plate 11 without protruding to the hindrance and without interfering with the turning operation of the work implement. In addition, since the second frame 14 is located on the side of the first frame 10, the movable range of the first frame 10 is not limited, and the second step 14 includes the second step in the storage posture. Since the steps overlap with each other in the folded structure, the width in the inner and outer directions of the entire step becomes narrow, and the protruding width of the first frame 10 can be easily secured.

  In the reference example of FIG. 12, a mounting portion 10c of the second frame 14A is provided adjacent to the side portion of the first frame 10, and the second frame has the structure described in FIG. 11 with respect to the mounting portion 10c. 14A is provided side by side with the first frame 10, and is attached to the first frame 10 so as to protrude and retract. However, according to this configuration, it is necessary to remove a part of the rib 11a of the first tread plate 11 and accommodate the second frame 14A, so that the strength of the first tread plate 11 is lowered. On the other hand, according to the above embodiment of the present invention, it can be realized without deleting the rib 11a of the first tread plate 11, which is advantageous in terms of strength.

  Moreover, when implementing this invention, it is good also as a pin fixed to the 1st flame | frame 10, for example, instead of a volt | bolt attachment member of the 2nd flame | frame 14. However, if the pivoting member is constituted by the bolt 12 as in the above embodiment, the bolt 12 is used as a fixing bolt for fixing the second frame 12 to the first frame 10 in the housing posture and the projecting posture. The mounting strength can be improved and the number of mounting members for mounting the second frame 14 to the first frame 10 can be reduced. In addition, since the fixing bolts that are fixed in the housing posture and the protruding posture are used in the respective postures, the bolts are always used for fixing, there is no need for storage, and there is no risk of loss.

  In the above embodiment, since the second tread plate 15 is detachably attached to the second frame 14 by the fixing bolts 16, the second tread plate 15 is removed during transportation and the second frame is removed. The work of attaching / detaching 14 to / from the first frame 10 can be performed. Here, when the weight of the second tread plate 15 is, for example, 17 kg, and the weight of the second frame 14 is, for example, 5 kg, the housing posture and the protruding posture with the second tread plate 15 still attached to the second frame 14 If the posture is to be changed between the two, the maintenance staff needs to support the load of 22 kg in total with one hand and perform the mounting work with the bolts 12 and 13 with the other hand. However, if the posture is changed by removing the second tread plate 15 from the second frame 14, the bolts 12, 13 are used while supporting a half load (2.5 kg) of the second frame 14 with one hand. Since the attachment work can be performed, the work becomes easy and the safety is improved.

  In the above-described embodiment, as shown in FIG. 4, the fixing bolt 16 for fixing the second tread plate 15 in the state where the second tread plate 15 is not attached to the second frame 14. Is screwed into the nut 27 provided on the second frame 14, so that there is no risk of the fixing bolt 16 being lost.

  In the above embodiment, the fixing bolt 18 for fixing the first frame 10 to the revolving frame 3 a is inserted into the bolt insertion hole 17 a of the guide block 17 fitted in the guide groove 10 b of the first frame 10. Because of the above configuration, the fixing bolt 18 does not come into contact with the wall surface of the guide groove 10 b of the first frame 10. For this reason, the thread of the fixing bolt 18 contacts the wall surface of the guide groove 10b of the first frame 10 to prevent the wall surface from being damaged or the fixing bolt 18 from being rusted due to the thread damage. Can do.

  Although the present invention has been described above by the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and additions can be made without departing from the gist of the present invention.

1: Lower traveling body, 1a: track frame, 2: turning device, 2: turning wheel, 3: upper turning body, 3a: turning frame, 4: bracket, 5: cab, 6: hydraulic power unit, 6a: fuel tank 6b: hydraulic oil tank, 6c: power source, 7: counterweight, 8: first step, 9: second step, 10: first frame, 10a: facing surface, 10b: guide groove, 11: 1st tread, 11a: rib, 12: bolt (pivoting member), 13: fixing bolt, 14: second frame, 15: second tread, 16: fixing bolt, 17: guide block, 18: fixing Bolt, 19: lower plate, 20: mounting portion, 21: screw hole, 22-24: screw hole, 25, 26: bolt insertion hole, 27: nut, 28: bolt insertion hole

Claims (4)

In the side step device of the work machine attached to the lower side of the upper swing body on the lower traveling body,
A first step comprising a left and right first frame and a first footboard fixed between the left and right first frames;
A second step comprising a second frame on the left and right and a second footboard fixed between the second frame on the left and right,
The first step can be slidably projected outward from the side surface at a lower side surface of the revolving frame of the upper revolving structure, and the left and right first frames can be fixed to the revolving frame by fixing bolts. Mounted on the
In the second step, one end side of the left and right second frames is pivotally attached to the mutually opposing surfaces of the left and right first frames in the first step, and the other side of the second frame. A side step of a working machine, wherein the second frame is fixedly attached to the first frame with a fixing bolt in a housing posture in which an end side faces inward and a protruding posture in which the other end side faces outward. apparatus. In the side step apparatus of the working machine according to claim 1,
A pivot member for pivotally coupling the second frame to the first frame is screwed into a screw hole provided on an opposing surface of the first frame, and the second frame is joined to the first frame. Consisting of bolts to be fastened,
The fixing bolt for fixing the second frame to the first frame in a housing posture and a protruding posture other than the pivotally attached portion of the second frame is a fixing bolt that is also used for fixing in each posture. A side step device for a work machine. In the side step apparatus of the working machine according to claim 1 or 2,
The side step device for a working machine, wherein the second tread plate is detachably attached to the second frame with a fixing bolt. In the side step apparatus of the working machine of any one of Claim 1 to 3,
The first frame has guide grooves that are long in the inner and outer directions of the upper swing body and penetrate vertically.
A guide block is fitted into the guide groove so as to be relatively slidable,
The first frame is sandwiched between a mounting portion having a screw hole provided on the lower surface of the swivel frame and a lower plate contacting the lower surface of the first frame, and is provided on the lower plate and the guide block. By inserting a fixing bolt from below into the bolt insertion hole, screwing it into the screw hole of the mounting portion, and loosening the fixing bolt, the first frame can move inward and outward with respect to the turning frame, and the fixing The side step device of a working machine, wherein the first frame is fixed to the revolving frame by fastening a bolt.

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