JP2010188764A - Step structure of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the step area of a tread, and to sufficiently and widely open an opening of a box body in a step structure used as both a lifting step and a tool box. <P>SOLUTION: An auxiliary step plate 42 is detachably mounted on an opening/closing lid 40 so as to horizontally project from the tip of a second step 34a formed on the top face of the tool box 30. In a swelling cover 18, a recessed part 18a partly recessed is formed so as not to interfere with the auxiliary step plate 42 when the opening/closing lid 40 is opened to the swelling cover 18 side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a step structure of a construction machine.

  Conventionally, in a construction machine such as a hydraulic excavator, work is generally performed on the upper side of the main body cover of the upper-part turning body, such as checking the amount of engine oil or checking water leakage of a radiator. Since the height to the upper surface exceeds 2 m depending on the model, an elevating step for the operator to elevate is provided (for example, see Patent Document 1).

  Moreover, in construction machines such as a hydraulic excavator, a tool box is provided on the main body frame in order to store various tools. For example, Patent Document 2 discloses a tool box structure including a box body having a storage space inside and an opening formed on the upper side, and a lid that can open and close the opening of the box body. Yes.

Here, if the lifting step and the tool box are separately installed on the main body frame of the upper swing body, it is difficult to secure the installation space. Therefore, a step structure has been developed in which the upper and lower steps and the tool box are combined by using the upper surface of the tool box as the stepping surface of the lifting step.
JP 2005-98013 A JP 2001-262624 A

  However, in the conventional step structure, when an operator opens the opening / closing lid to the body cover side in order to take out the tools stored in the box body of the lifting / lowering step, a part of the opening / closing lid interferes with the body cover. There was a possibility that the opening could not be opened sufficiently. In particular, as in the step structure described in Patent Document 1, when adopting a structure that increases the tread of the tread by attaching an auxiliary plate that protrudes horizontally from the tread of the box body However, the auxiliary plate interferes with the main body cover, and the opening area is further reduced.

  The present invention has been made in view of such a point, and an object of the present invention is a step structure in which an ascending / descending step and a tool box are combined. The part can be opened sufficiently large.

  In order to achieve the above-described object, the present invention secures a sufficient tread of the tread surface by attaching an auxiliary step plate to the open / close lid, and makes the open / close lid cover the decorative cover by recessing a part of the decorative cover. Auxiliary step plates were not interfered when opened to the side.

  Specifically, the present invention includes an upper swing body mounted on a lower traveling body, an elevating step for an operator to move up and down to the upper portion of the upper swing body, an upper portion of the upper swing body, and an elevating step. The following solution was taken for a step structure of a construction machine provided with a decorative cover arranged continuously with the upper surface.

That is, according to the first aspect of the present invention, the elevating step comprises:
A box body having a storage space inside and having an opening on the upper side;
An open / close lid capable of opening and closing the opening of the box body;
The horizontal step protrudes from the tip of the tread surface formed on the upper and lower step upper surface, and includes an auxiliary step plate attached to the opening and closing lid,
The decorative cover is characterized in that a concave portion is formed in which a part thereof is depressed so that the auxiliary step plate does not interfere when the opening / closing lid is opened to the decorative cover side.

  In the first aspect of the present invention, the elevating step includes a box body having a storage space inside and having an opening formed on the upper side. An opening / closing lid is provided at the opening of the box body so as to be openable and closable. An auxiliary step plate is attached to the opening / closing lid. The auxiliary step plate protrudes in the horizontal direction from the tip of the tread surface formed on the upper surface of the elevating step. Then, the decorative cover is formed with a recessed portion that is partially recessed. The concave portion prevents the auxiliary step plate from interfering when the opening / closing lid is opened to the decorative cover side.

  If it is set as such a structure, a tread surface can be enlarged by attaching an auxiliary step board to an opening-and-closing lid. In addition, when the operator opens the opening / closing lid of the lifting step, the auxiliary step plate enters the recess of the decorative cover, so that the auxiliary step plate and the decorative cover do not interfere with each other, and the opening of the box body is sufficient. Can open greatly.

  Specifically, the raising / lowering step is for the operator to ascend / descend to the upper part of the upper swing body, and is installed in the vicinity of the fuel tank. Therefore, when the opening / closing lid of the elevating step is opened to the fuel tank side, there is a possibility that a part of the opening / closing lid interferes with the decorative cover disposed on the front surface of the fuel tank and the opening cannot be sufficiently opened. . In particular, when an auxiliary step plate is provided on the open / close lid so as to increase the tread of the stepping surface of the lifting step, the auxiliary step plate interferes with the decorative cover, and the opening area of the opening portion is further reduced. There was a fear.

  On the other hand, in the present invention, an auxiliary step plate protruding in the horizontal direction from the tip of the tread surface formed on the upper surface of the elevating step is attached to the open / close lid to secure a sufficient tread for the tread surface, Even if the opening / closing lid is opened, the auxiliary step plate enters the concave portion of the decorative cover so that the auxiliary step plate and the decorative cover do not interfere with each other. The opening can be opened sufficiently large.

The invention of claim 2 is the invention according to claim 1,
The recess of the decorative cover is recessed so as to be continuous with the tread surface of the elevating step, whereby the tread of the tread surface is increased.

  In the invention of claim 2, the recess of the decorative cover is recessed so as to be continuous with the stepping surface of the elevating step, and the tread of the treading surface is increased. With such a configuration, it is possible to expand the tread of the tread surface without changing the size of the lifting step itself, and to achieve both space saving of the lifting step and ensuring worker safety. it can.

The invention of claim 3 is the invention according to claim 1 or 2,
The upper swing body is provided with a boom foot pin that extends in the left-right direction of the vehicle and supports the boom rotatably.
The auxiliary step plate is disposed at a position overlapping the boom foot pin in a side view and is detachably attached to the opening / closing lid.

  According to a third aspect of the present invention, the upper swing body is provided with a boom foot pin that rotatably supports the boom. The boom foot pin extends in the left-right direction of the vehicle. An auxiliary step plate is disposed at a position overlapping the boom foot pin in a side view. The auxiliary step plate is detachably attached to the opening / closing lid.

  With this configuration, when the boom foot pin is removed for maintenance, even if the boom foot pin and the auxiliary step plate overlap in side view, the construction can be done simply by removing the auxiliary step plate from the lid. The boom foot pin can be easily pulled out and removed from the side of the machine.

  Specifically, when the auxiliary step plate is integrally joined to the open / close lid by welding or the like, the boom foot pin interferes with the auxiliary step plate even if the boom foot pin is pulled out from the side of the construction machine. It cannot be removed. Therefore, it is necessary to remove the box main body and the opening / closing lid at the lifting step from the main body frame, which increases the work load on the operator.

  In contrast, in the present invention, even if the boom foot pin overlaps the auxiliary step plate in a side view, the boom foot pin can be easily removed from the side of the construction machine by removing only the auxiliary step plate from the opening / closing lid. Can be pulled out and taken out, and the work burden can be reduced.

  According to the present invention, an auxiliary step plate protruding in the horizontal direction from the tip of the tread surface formed on the upper surface of the elevating step is attached to the open / close lid to secure a sufficient tread for the tread surface, while part of the decorative cover is attached. Even if the opening / closing lid is opened by forming a recess, the auxiliary step plate enters the recess of the decorative cover so that the auxiliary step plate and the decorative cover do not interfere with each other, and the opening of the box body Can be opened large enough.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

<Overall configuration of construction machinery>
FIG. 1 is a side view showing an overall configuration of a construction machine to which the present invention is applied. As shown in FIG. 1, the construction machine 10 is a hydraulic excavator in which an upper swing body 2 (main body frame) that can be rotated is mounted on a crawler type lower traveling body 1. The upper swing body 2 includes a main body frame 3, an attachment 4, a cab 5, a machine room 6, a counterweight 7, and the like attached to the main body frame 3.

  In this embodiment, in FIG. 1, the side on which the attachment 4 on the left side of the drawing is arranged is the front side of the vehicle, and the side on which the cab 5 on the front side of the paper is arranged is the left side of the vehicle. Shall follow unless otherwise stated.

  A pair of vertical plates 14 (see FIG. 8) is erected at a substantially central position of the main body frame 3. Boom foot pins 15 (see FIGS. 2 and 8) extending in the vehicle left-right direction are supported by the pair of vertical plates 14.

  The attachment 4 is supported at the center of the front part of the upper swing body 2 so as to be raised and lowered, and has a substantially square-shaped boom 11 supported so as to be rotatable with respect to the boom foot pin 15, and the length of the boom 11. The arm 12 extends in the direction and is rotatably supported by the boom 11, and the bucket 13 is rotatably supported by the arm 12.

  The cab 5 is a rectangular box type cab equipped with an operation seat, various control devices, operation devices, and the like, and is located at the front of the upper swing body 2 so as to be adjacent to the left side of the attachment 4. Arranged on the left side.

  The machine room 6 is disposed on the rear part of the upper swing body 2 between the left and right sides. A counterweight 7 is disposed in a portion extending between the left and right sides on the rear side of the machine room 6. As shown in FIG. 2, a hydraulic oil tank 23 for storing hydraulic oil is disposed in the right front portion of the machine room 6. A fuel tank 24 for storing fuel is disposed adjacent to the front side of the hydraulic oil tank 23. The machine room 6 is covered with a group of main body covers 17. A fuel supply port 24 a is provided in the upper part of the fuel tank 24.

  Further, as shown in FIG. 3, a bulge cover 18 (decorative cover) that bulges so as to overlap the upper surface of a tool box 30 (lifting step), which will be described later, is provided on the upper front side of the fuel tank 24. It has been. The bulging cover 18 is disposed so as to be continuous with the upper portion of the fuel tank 24 and the upper surface of the tool box 30. On the front side of the bulging cover 18, a recessed portion 18 a is formed in which a part thereof is recessed so as not to interfere when the opening / closing lid 40 of the tool box 30 is opened to the fuel tank 24 side.

  The concave portion 18a is recessed so as to be continuous with a second step 34a described later, which is a tread surface provided on the upper surface of the tool box 30. Thereby, the step allowance of the 2nd step 34a is expanded.

  A bonnet 26 is provided on the upper surface of the upper swing body 2. The bonnet 26 has a rectangular dome shape that bulges upward, and is attached so as to be openable and closable. And arrangement | positioning of an engine etc. is devised below the bonnet 26 so that the some inspection site | part to be regularly inspected may be located. For example, parts that require periodic inspection, such as parts that check for water leaks in the radiator, parts that check the tension of the engine belt, and parts that check the engine oil level gauge, are collectively arranged below the hood 26. It is installed.

  At a position adjacent to the front side of the fuel tank 24, a tool box 30 capable of storing various tools is disposed. The upper surface of the tool box 30 is inclined obliquely upward from the front side to the rear side and is formed one step lower than the upper surface of the fuel tank 24. And this toolbox 30 comprises the raising / lowering step for an operator to raise / lower to the upper surface of the machine room 6 of the back. A specific configuration of the tool box 30 will be described later.

  At a portion of the main body frame 3 located at the lower front side of the tool box 30, a step 27 for the operator to place his / her foot first is provided so as to protrude forward.

  Here, in order to assist an operator to move up and down, a handrail 28 formed by bending a metal pipe into an arch shape is provided. The handrail 28 has a lower end attached to the right corner of the main body frame 3 and an upper end attached to the front surface of the fuel tank 24, and the right side of the fuel tank 24 extends substantially in the front-rear direction along the tool box 30. It extends to.

  Further, in order to ensure the safety of an operator who has risen to the upper surface of the fuel tank 24 using the tool box 30 as an ascending / descending step, a metal pipe is bent and formed in an inverted U shape on the upper surface of the fuel tank 24 A safety fence 29 is provided.

<Step structure>
Next, a step structure using the tool box 30 which is a characteristic part of the present invention will be described. 3 is a perspective view showing the overall structure of the tool box according to the present embodiment, FIG. 4 is a perspective view showing a state in which the open / close lid of the tool box is opened, and FIG. 5 is an exploded perspective view of the tool box. As shown in FIGS. 3 to 5, the tool box 30 is for storing various tools, and includes a box main body 31 having a storage space S <b> 1 inside and an opening 31 a formed on the upper side. An opening / closing lid 40 that can open and close the opening of the box body 31 is provided. The opening / closing lid 40 is attached to the box body 31 in a state where it is inclined obliquely upward from the front side to the rear side.

  As shown in FIG. 5, the box body 31 is formed in a hollow box shape by combining a bottom plate 32, a front side plate 33, a rear side plate 34, a left side plate 35, and a right side plate 36. Here, the front side plate 33 and the rear side plate 34 are formed by standing up and down by bending both front and rear end portions of the bottom plate 32 by pressing. That is, the bottom plate 32, the front side plate 33, and the rear side plate 34 are integrally formed by a single metal plate. As described above, by integrally forming the bottom plate 32, the front side plate 33, and the rear side plate 34 with a single metal plate, stable rigidity can be ensured as compared with the case where the plate members are joined by welding or the like. .

  Here, the height of the front side plate 33 is set to be lower than the height of the rear side plate 34. The upper end portion of the front side plate 33 is bent obliquely upward and inside to form an inclined surface continuous with the opening / closing lid 40. Further, the upper end portion of the rear side plate 34 is bent inward in the horizontal direction to form a part of a tread surface of a second step 34a described later.

  The left side plate 35 and the right side plate 36 are formed in a substantially trapezoidal shape so as to cover the left and right ends of the bottom plate 32, the front side plate 33, and the rear side plate 34. The peripheral portions of the left side plate 35 and the right side plate 36 are bent inward of the box by press work. Specifically, the bent portion is set to a size that can be fitted into the peripheral edges of the left and right ends of the bottom plate 32, the front side plate 33, and the rear side plate 34.

  Then, the bent portions of the left side plate 35 and the right side plate 36 are fitted into the left and right ends of the bottom plate 32, the front side plate 33, and the rear side plate 34, respectively, and then joined by welding or the like, so that a box-like box body 31 is formed.

  As described above, the bottom plate 32, the front side plate 33, and the rear side plate 34 are integrally formed of a single metal plate, and the left side plate 35 and the right side plate 36 are joined to the left and right ends thereof. Stock management of members can be simplified. That is, even if the size in the width direction of the tool box 30 is changed for each model of the construction machine 10, only the integrally formed members (the bottom plate 32, the front side plate 33, and the rear side plate 34) are changed in size. Since the left side plate 35 and the right side plate 36 may be used as a common member, the types of constituent members can be reduced.

  On the periphery of the opening 31a of the box body 31, a weather strip 37 formed of a resin material or a rubber material having a sealing property is provided. Specifically, the four corners of the opening 31a of the box body 31 are formed in an arc shape, and one long weather strip 37 is attached along the periphery of the opening 31a. The weather strip 37 is pressed and elastically deformed with the opening / closing lid 40 closed, thereby sealing the gap between the box body 31 and the opening / closing lid 40.

  The bottom plate 32 of the box body 31 has a substantially square bottom opening 32a that opens in the thickness direction. At four corners of the bottom opening 32a, attachment holes 32b for inserting fastening bolts (not shown) to fasten and fix the box main body 31 to the main body frame 3 are formed.

  At a position corresponding to the bottom opening 32a of the box main body 31 in the main body frame 3, a stepped portion 3a (see FIG. 7) that is recessed in a step shape from the upper surface is formed. A seal member 45 is disposed on the peripheral edge of the stepped portion 3a. The box main body 31 is installed on the main body frame 3 via a seal member 45, and the storage space S1 of the box main body 31 and the step space S2 of the main body frame 3 communicate with each other.

  With such a configuration, in addition to the storage space S1 of the box body 31, the step space S2 of the step portion 3a of the main body frame 3 can be effectively used as a storage space, and the storage space inside the tool box 30 can be used. Can be enlarged. Furthermore, by providing the sealing member 45 at the peripheral edge of the bottom opening 32a of the box body 31, rainwater or the like enters the box body 31 from the gap between the connection portions of the box body 31 and the body frame 3 through the bottom opening 32a. Can be reliably prevented from flowing in.

  6 is a plan sectional view showing the internal structure of the tool box, and FIG. 7 is a side sectional view. As shown in FIGS. 6 and 7, a drain hole 32c is formed at a position near the front side plate 33 on the bottom plate 32 of the box body 31 and at a position outside the bottom opening 32a. The drain hole 32 c is for draining water that has flowed into the box body 31 to the outside, and is formed at a position outside the seal member 45.

  That is, the water drained from the drain hole 32c to the outside of the box body 31 is provided at the connection portion even if it tries to flow into the box body 31 again through the gap at the connection portion between the box body 31 and the body frame 3. The seal member 45 is sealed. Thereby, drainage work can be performed reliably.

  As shown in FIG. 3, the opening / closing lid 40 is attached to the upper end portion of the rear plate 34 of the box body 31 through a hinge 41 so as to be opened and closed. Accordingly, the various tools stored in the tool box 30 can be taken out by lifting the front side of the opening / closing lid 40 and opening it to the fuel tank 24 side. The opening / closing lid 40 forms an inclined surface inclined obliquely upward from the front side plate 33 of the box body 31 toward the rear side plate 34.

  The opening / closing lid 40 has a first step 40a recessed at a substantially central position in the tilt direction. This first step 40a is for putting a foot on the footrest 27 (see FIG. 2) when the worker ascends and descends on the main body frame 3. An uneven portion 40b is provided for removing mud and the like of the shoe sole.

  An auxiliary step plate 42 is attached to the upper end of the opening / closing lid 40. The auxiliary step plate 42 constitutes a second step 34a for the operator to place his / her feet following the first step 40a, and is continuous with the second step 34a on the upper side of the rear plate 34 of the box body 31. And the tread is formed by projecting in the horizontal direction. Thereby, since the step allowance of the 2nd step 34a is expanded, it becomes advantageous when ensuring the safety at the time of an operator's raising / lowering.

  The auxiliary step plate 42 is detachable by being fastened to the opening / closing lid 40 with fastening bolts 43. The front end portion of the auxiliary step plate 42 is bent upward and is erected, and an uneven portion 42a is formed on the upper end edge portion for preventing slipping and mud on the shoe sole of the operator.

  The box body 31, the opening / closing lid 40, and the auxiliary step plate 42 can be color-coded for easy distinction through vision, and the operator can accurately position the first step 40a and the second step 34a. Recognize and be able to ascend and descend safely.

  FIG. 8 is a side cross-sectional view showing the open / close state of the open / close lid of the tool box. As shown in FIG. 8, when the opening / closing lid 40 is opened, the auxiliary step plate 42 enters the recess 18a of the bulging cover 18, so that the auxiliary step plate 42 and the bulging cover 18 do not interfere with each other. The opening 31a of the box body 31 can be opened sufficiently large.

  The front end portion of the auxiliary step plate 42 may be disposed at a position overlapping the boom foot pin 15 in a side view. Here, since the auxiliary step plate 42 is detachably attached to the opening / closing lid 40 by the fastening bolt 43, the work load on the operator is reduced when the boom foot pin 15 needs to be removed during maintenance. be able to.

  Specifically, when the auxiliary step plate 42 is integrally joined to the opening / closing lid 40 by welding or the like, even if the boom foot pin 15 is pulled out from the side of the construction machine 10, the boom foot pin 15 is It cannot be removed because it interferes with the plate 42. Therefore, it is necessary to remove the box main body 31 and the opening / closing lid 40 of the tool box 30 from the main body frame 3 once, and the work load of the operator is increased.

  On the other hand, in the present invention, even if the boom foot pin 15 overlaps the auxiliary step plate 42 in a side view, the construction can be performed by removing the fastening bolt 43 and removing only the auxiliary step plate 42 from the opening / closing lid 40. The boom foot pin 15 can be easily pulled out and taken out from the side of the machine 10, and the work burden can be reduced.

  A lock mechanism 46 for locking and holding the opening 31 a of the box main body 31 in a state of being closed by the opening / closing lid 40 is provided at the right position of the first step 40 a in the opening / closing lid 40.

  As shown in FIG. 7, the lock mechanism 46 includes a key cylinder 47 and a hook portion 48 that can be switched between an open position and a closed position in conjunction with an opening / closing operation of the key cylinder 47.

  An engagement plate 36a protruding inward of the box is provided on the upper side of the right side plate 36 of the box body 31, and when the hook portion 48 is positioned at the closed position, the hook portion 48 and the engagement plate 36a is engaged and the open / close lid 40 is locked.

  Here, on the front side of the key cylinder 47 in the lock mechanism 46, a lock step portion 49 that is recessed in a step shape is formed so that an operator can easily catch a finger when opening and closing the opening / closing lid 40. A drain hole 49 a penetrating into the box body 31 is formed at the bottom of the lock step 49.

  Thus, by providing the drain hole 49 a at the bottom of the lock step portion 49, rainwater or the like flows into the box body 31 without collecting in the lock step portion 49. Therefore, when the operator opens the opening / closing lid 40, it is possible to prevent the operator's hand from getting wet and causing discomfort.

  In addition, since the lock mechanism 46 is disposed at a position different from the first step 40a in the opening / closing lid 40, the operator does not step on the lock mechanism 46 when moving up and down the first step 40a. Therefore, it is advantageous in preventing problems such as mud on the shoe sole of the operator entering the key cylinder 47 of the lock mechanism 46 and damaging the lock mechanism 46.

  As shown in FIGS. 6 and 7, an illumination device 50 for irradiating light toward the outside of the box body 31 is provided inside the box body 31. Specifically, the illumination device 50 is disposed near the front side plate 33 of the box body 31. In addition, an illumination opening 33 a is formed in the front side plate 33 at a position facing the irradiation surface of the illumination device 50.

  As shown in FIG. 3, the illumination opening 33 a is formed of two long holes formed at intervals in the vertical direction. And the light irradiated from the illuminating device 50 is irradiated ahead of the construction machine 10 through the illumination opening part 33a.

  Here, in the vicinity of the illumination opening 33a in the bottom plate 32 of the box body 31, the drain hole 32c described above is formed. Therefore, even when rainwater or the like flows into the box main body 31 through the illumination opening 33a, it can be drained to the outside of the box main body 31 through the drain holes 32c formed in the vicinity thereof. Thereby, it can prevent that the tools accommodated in the box main body get wet with water and rust.

  The periphery of the lighting device 50 is covered with a protective cover 51. Specifically, the protective cover 51 includes a side wall portion 51 a that covers the left and right side surfaces and the rear side surface of the lighting device 50, and a bottom surface portion 51 b that covers the bottom surface of the lighting device 50. Here, the bottom surface portion 51b forms an inclined surface inclined downward from the rear side toward the front side. Further, a gap is provided between the front end of the bottom surface portion 51b and the front side plate 33 of the box body 31, and water flowing along the inclined surface of the bottom surface portion 51b is formed on the bottom plate 32 of the box body 31. The drainage hole 32c is led.

  The lighting device 50 is protected by the side wall 51a of the protective cover 51 and the front side plate 33 of the box body 31 so that the entire front and rear and right and left directions are surrounded. Here, the upper side of the lighting device 50 is not covered by the protective cover 51 and is exposed.

  The position of the rear end portion of the side wall portion 51a of the protective cover 51 is set to be located rearward in a side view with respect to the position of the drain hole 49a formed in the lock step portion 49 of the opening / closing lid 40. . Thereby, the protective cover 51 functions as a drainage plate that receives water flowing into the box body 31 from the drain hole 49a.

  Hereinafter, with reference to FIG. 7, a flow path of water from rainwater or the like flowing into the box body 31 through the drain hole 49 a or the illumination opening 33 a to being drained from the drain hole 32 c will be described. In addition, the distribution route of water shall be shown with the arrow described with the dashed-two dotted line.

  As shown in FIG. 7, rain water or the like collects in the upper surface of the opening / closing lid 40, more specifically, in the lock step portion 49, and then flows into the box body 31 through the drain hole 49a. Water that has flowed into the box body 31 from the drain hole 49 a is received by the protective cover 51 and flows between the side wall 51 a of the protective cover 51 and the lighting device 50.

  And the water which flowed along the side wall part 51a of the said protective cover 51 flows ahead along the inclined surface of the bottom face part 51b. The water that flows down from the front end of the bottom surface portion 51 b is drained to the outside of the box body 31 through a drain hole 32 c formed in the bottom plate 32 of the box body 31.

  On the other hand, rainwater or the like also flows into the box body 31 from the illumination opening 33a. The water flowing in from the illumination opening 33a flows down along the front side plate 33 and is drained to the outside of the box body 31 through the drain hole 32c.

  As described above, according to the step structure of the construction machine 10 according to the present embodiment, the auxiliary step plate 42 protruding in the horizontal direction from the tip of the second step 34 a formed on the upper surface of the tool box 30 is attached to the opening / closing lid 40. While the step margin is sufficiently secured, a part of the bulging cover 18 is recessed to form the concave portion 18a, so that the auxiliary step plate 42 can be provided with the concave portion 18a of the bulging cover 18 even when the opening / closing lid 40 is opened. Therefore, the auxiliary step plate 42 and the bulging cover 18 do not interfere with each other, and the opening 31a of the box body 31 can be opened sufficiently large.

  As described above, the present invention is a step structure in which the lifting step and the tool box are combined, and can secure a stepping amount of the tread surface and can open the opening of the box body sufficiently large. Therefore, it is extremely useful and has high industrial applicability.

It is a side view which shows the whole structure of the construction machine to which this invention is applied. It is a side view which shows the principal part of a construction machine. It is a perspective view which shows the whole toolbox structure. It is a perspective view which shows the state which opened the open / close lid of the tool box. It is a disassembled perspective view of a tool box. It is a plane sectional view showing the internal structure of a tool box. It is side surface sectional drawing which shows the internal structure of a tool box. It is side surface sectional drawing which shows the open / close state of the open / close lid of a tool box.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 10 Construction machine 11 Boom 15 Boom foot pin 18 Swelling cover (decorative cover)
18a Recess 30 Tool box (lifting step)
31 Box body 31a Opening 34a Second step (tread)
40 Opening / closing lid 42 Auxiliary step plate S1 Storage space

Claims (3)

An upper revolving unit mounted on the lower traveling unit, an elevating step for an operator to move up and down to the upper part of the upper revolving unit, and an upper part of the upper revolving unit and an upper surface of the elevating step are arranged continuously A step structure of a construction machine with a decorative cover,
The lifting step includes
A box body having a storage space inside and having an opening on the upper side;
An open / close lid capable of opening and closing the opening of the box body;
The horizontal step protrudes from the tip of the tread surface formed on the upper and lower step upper surface, and includes an auxiliary step plate attached to the opening and closing lid,
A step of a construction machine characterized in that the decorative cover is formed with a recessed portion in which a part thereof is depressed so that the auxiliary step plate does not interfere when the opening / closing lid is opened to the decorative cover side. Construction. In claim 1,
A step structure of a construction machine, wherein the recess of the decorative cover is recessed so as to be continuous with the stepping surface of the elevating step, whereby the step margin of the stepping surface is expanded. In claim 1 or 2,
The upper swing body is provided with a boom foot pin that extends in the left-right direction of the vehicle and supports the boom rotatably.
A step structure of a construction machine, wherein the auxiliary step plate is disposed at a position overlapping the boom foot pin in a side view and is detachably attached to the opening / closing lid.

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