JP2022060868A - Construction machine - Google Patents

Abstract

To provide a construction machine with an outside face of a cab arranged inner side in a lateral direction from the outside face of a crawler, allowing easy moving of a worker between a traveling face and the cab without passing through an upper face part of the crawler.SOLUTION: An upper machinery 2 of a hydraulic shovel 100 has a cab 7, a step 75. a ladder member 80 and a ladder support part 90. The step 75 is extended to an upper part of a shoe outer side face 13B of a crawler shoe 13. The ladder support part 90 supports the ladder part 80 to be variable between a liftable state and a stored state. In the stored state, the ladder member 80 is stored in a state of straddling both storing parts of an under-cab storing part A2 and an under-step storing part A3.SELECTED DRAWING: Figure 13

Description

The present invention relates to a construction machine having a cab.

Conventionally, a construction machine having a lower traveling body capable of traveling on a traveling surface such as the ground, an upper swivel body rotatably supported by the lower traveling body, and a work attachment supported by the upper swivel body is known. ing. The lower traveling body has a pair of left and right crawlers traveling on the traveling surface, and the upper swivel body is fixed to a swivel frame supported by the lower traveling body and the swivel frame for an operator to board. Has a cab and.

Patent Document 1 discloses a hydraulic excavator as the construction machine. In the hydraulic excavator, the cab is arranged at the left end of the swivel frame, and the left side surface (outer surface) of the cab is arranged inside the left end of the left crawler of the pair of left and right crawlers in the left-right direction. ing. That is, in the hydraulic excavator, the crawler on the left side is arranged so as to project outward in the left-right direction from the cab. On the left side surface of the cab, an entrance / exit for an operator to enter and exit the cab is formed. Further, a step (step) for assisting the worker to enter and exit the cab is formed near the entrance of the cab. The worker once climbs from the ground to the upper surface of the crawler on the left side, and then boarded in the cab through the step. In large hydraulic excavators (construction machinery), the relative size of the crawler to the cab is larger than that of small and medium-sized hydraulic excavators, so the crawler protrudes laterally outward from the cab as described above. May be arranged as such.

On the other hand, Patent Document 2 discloses a hydraulic excavator in which the left side surface of the cab and the left end portion of the left side crawler are arranged at the same position (plane) in the left-right direction. Further, the upper swivel body further has a ladder member rotatably supported by the swivel frame below the entrance / exit. The ladder member hangs down from the entrance / exit toward the traveling surface in the vertical direction, and the operator can move back and forth between the traveling surface and the cab through the ladder member.

Japanese Unexamined Patent Publication No. 11-193548 Japanese Unexamined Patent Publication No. 7-257281

When the left crawler is arranged so as to protrude outward in the left-right direction from the cab as in the hydraulic excavator described in Patent Document 1, the upper surface of the crawler is relatively unstable on the ground or from the cab. It is necessary to move to the section once, and there is a problem that the operator is burdened with the operation of getting on and off the cab. In particular, in a large hydraulic excavator, the upper surface of the crawler is arranged at a position higher than the traveling surface, which further increases the burden on the operator. Further, when the ladder member described in Patent Document 2 is applied to the hydraulic excavator described in Patent Document 1, the ladder member hanging from the step of the cab connects the cab and the upper surface portion of the crawler. Since only this can be done, it cannot be eliminated that the operator goes back and forth between the cab and the traveling surface via the upper surface of the crawler.

An object of the present invention is that in a construction machine in which the outer surface of the cab is arranged inside the outer surface of the crawler in the left-right direction, the operator can easily move between the traveling surface and the cab without passing through the upper surface of the crawler. Is to be able to come and go to.

Provided by the present invention is a construction machine having a car body including a center line extending in the vertical direction and a pair of left and right crawler units arranged on both left and right sides of the car body and capable of traveling on a traveling surface. A lower traveling body and an upper main body supported by the car body of the lower traveling body are provided, and one of the left and right crawler units of the lower traveling body is connected to the car body. A crawler including a crawler frame, a crawler shoe that is rotatably supported by the crawler frame, an upper surface portion of the shoe facing upward, and an outer surface of the shoe facing outward, which is a direction away from the center line in the left-right direction. The upper body has a shoe, and the upper body has an upper surface portion and a lower surface portion and is arranged above the shoe upper surface portion at intervals, and a cab fixed to the upper surface portion of the upper frame portion. It has a cab outer surface that is arranged closer to the center line than the shoe outer surface when viewed from the front-rear direction and faces the outer direction, and a worker who gets on and off the cab passes through the cab outer surface. A cab in which an allowable entrance / exit is formed, and a stepping platform that is arranged so as to overlap the entrance / exit in the front-rear direction and is fixed to the upper frame above the upper surface of the shoe in the left-right direction. A ladder having a stepping platform having a stepping platform tip portion arranged above the shoe outer surface on the opposite side of the stepping platform base end portion and a ladder that allows an operator to move up and down between the traveling surface and the stepping platform. The member, the stepping platform lower storage portion arranged between the stepping platform and the shoe upper surface portion when viewed from the front-rear direction, and the stepping platform arranged between the cab and the shoe upper surface portion when viewed from the front-rear direction. A ladder support portion that has a cab lower storage portion that communicates with the lower storage portion and supports the ladder member so that the ladder member can change its state between the elevating and lowering state and the retractable state. The state is a state in which the ladder member extends in the vertical direction between the tip of the step and the traveling surface, and the retracted state is a state in which the ladder member extends in the horizontal direction along the left and right directions of the cab lower storage portion and the step lower storage portion. It has a ladder support portion that is in a state of being stored straddling both of the storage portions.

According to this configuration, in a construction machine in which the entrance / exit formed on the outer surface of the cab is arranged inside the shoe outer surface of the crawler unit in the left-right direction, the step ladder extends to the area above the shoe outer surface. Therefore, the operator can move back and forth between the traveling surface and the cab via the ladder member without passing through the shoe upper surface portion, which is relatively unstable. Further, since the ladder member that can be raised and lowered is arranged so as to extend in the vertical direction between the tip of the step and the running surface, the operator can easily move up and down between the step and the running surface. can. Further, when the ladder member is not used, by putting the ladder member in the retracted state, it is possible to prevent the ladder member from interfering with the work of the construction machine. Furthermore, since the ladder member can be stored in cooperation with the stepping platform lower storage unit and the cab lower storage unit, the ladder member can be lengthened as compared with the case where the ladder member is stored only directly under the cab. This makes it possible to dispose the ladder member in a wider range between the step and the traveling surface in the ascending / descending state. As a result, the operator can easily move back and forth between the traveling surface and the cab.

In the above configuration, the ladder member has a ladder upper end portion which is an upper end portion of the ladder member in the elevating state, and the ladder support portion is around a rotation center axis extending the upper end portion of the ladder in the front-rear direction. The rotation support portion that rotatably supports and the ladder upper end portion of the ladder member in a state of being rotated in the outward direction around the rotation center axis from the elevating state are in the outer direction of the left-right direction. Further includes a storage guide that guides the upper end of the ladder at least in the left-right direction so that the stepped lower storage portion and the cab lower storage portion can be sequentially entered in the opposite inward direction. It is desirable to have.

According to this configuration, the operator rotates the ladder member in the ascending / descending state in the outward direction around the rotation center axis, and then moves the ladder member to the stepping platform lower storage portion and the cab lower storage portion along the storage guide portion. Can be easily stored.

In the above configuration, the ladder member is arranged so as to project inward from the lower end of the ladder, which is the lower end of the ladder member in the elevating state, and from the lower end of the ladder in the elevating state. It is desirable to further have a regulating portion that regulates the inward movement of the ladder member by abutting against the crawler frame.

According to this configuration, the restricting portion abuts on the crawler frame in the ascending / descending state, so that the relative position of the ladder member with respect to the crawler unit can be stably held, so that the operator can move between the step and the traveling surface. You can go up and down safely.

In the above configuration, the portion of the ladder member in the elevating state between the upper end portion of the ladder and the lower end portion of the ladder is arranged so as to be spaced apart from the outer surface of the shoe in the outward direction. It is desirable that the amount of protrusion of the restricting portion with respect to the lower end portion of the ladder is set.

According to this configuration, it is possible to prevent the ladder member from interfering with the crawler shoe in the ascending / descending state, and to prevent damage to at least one of the ladder member and the crawler shoe.

In the above configuration, the ladder member is arranged at the upper end portion of the ladder and has a pair of front and rear ladder fulcrums extending in the front-rear direction, and the ladder support portion is spaced apart from the lower surface portion of the upper frame in the front-rear direction. It is a pair of front and rear support frames that can be mounted and support the ladder member, and the front and rear pair of support frames have the ladder fulcrum portion so that the ladder fulcrum portion can move at least in the left-right direction. It further has a pair of front and rear support frames in which a first guide groove that engages with the first guide groove is formed, and the rotation support portion is composed of the outward end portion of the first guide groove, and the storage guide portion. Is preferably configured by the first guide groove.

According to this configuration, since the first guide groove formed in the pair of front and rear support frames can also serve as the rotation support portion and the storage guide portion, the number of parts of the ladder support portion can be reduced and the configuration can be simplified. can.

In the above configuration, it is desirable that the first guide groove is formed so as to extend downward toward the inward direction.

According to this configuration, when the ladder member is in the retracted state, the ladder fulcrum portion is arranged at the tip end portion (lower end portion) of the first guide groove due to the weight of the ladder member, so that vibration during work of a construction machine or the like is performed. It is possible to prevent the ladder member from jumping out of each storage portion due to the tilting or tilting.

In the above configuration, the ladder support portion has a one end portion including the rotation support portion and a pair of auxiliary fulcrum portions arranged at the other end portion on the opposite side of the one end portion and extending in the front-rear direction. The first auxiliary support member that rotatably supports the upper end portion around the rotation center axis, and the first auxiliary support member and the ladder member that are mounted on the lower surface portion of the upper frame at intervals in the front-rear direction. A pair of front and rear support frames that can be supported, and the front and rear pair of support frames have the auxiliary fulcrum portion so that the auxiliary fulcrum portion of the first auxiliary support member can move at least in the left-right direction. It further has a pair of front and rear support frames on which a second guide groove to be engaged is formed, and the storage guide portion is composed of the second guide groove and at least the upper end portion of the ladder is formed together with the first auxiliary support member. It is desirable to guide along the left-right direction.

According to this configuration, the ladder member can be stored in the stepping platform lower storage portion and the cab lower storage portion by moving the first auxiliary support member that rotatably supports the ladder member along the second guide groove. At the same time, the degree of freedom in the posture of the ladder member in the retracted state can be increased by allowing the relative posture change of the ladder member with respect to the first auxiliary support member.

In the above configuration, the outward end of the second guide groove is arranged at a position closer to the center line in the left-right direction than the step tip, and the ladder support is the second auxiliary support member. The second auxiliary support member is rotatably supported by the pair of front and rear support frames on the tip side in the outward direction from the second guide groove, and the pair of front and rear rotation base ends. It is possible to support the ladder member so as to be arranged below the rotation support portion and between the ladder member and the shoe outer surface in the elevating possible state and maintain the posture in which the ladder member extends in the vertical direction. It is desirable to have a possible auxiliary support.

When the outer end of the second guide groove is arranged inside the tip of the step ladder, the first auxiliary support member is arranged so as to be inclined downward toward the outer direction in the elevating possible state. The posture of the ladder member may become unstable due to being rotatably supported by such a first auxiliary support member. On the other hand, according to the above configuration, the auxiliary support portion of the second auxiliary support member can support the ladder member so as to maintain a posture extending in the vertical direction below the first auxiliary support member. As described above, it is possible to prevent the posture of the ladder member from becoming unstable.

In the above configuration, the ladder support portion is interposed between the upper frame and the pair of front and rear support frames so that the pair of front and rear support frames can rotate around the frame rotation center axis extending in the front-rear direction. It further has a rotating frame that supports each of the pair of front and rear support frames, and in the elevating and lowering state of the ladder member, the second guide groove extends upward inward by at least the weight of the ladder member. While the pair of front and rear support frames are arranged as described above, the first auxiliary support member and the ladder member are along the second guide groove when the ladder member is changed from the elevating state to the retractable state. The pair of front and rear support frames rotate around the center axis of rotation of the frame until the second guide groove extends inwardly downward as the stepladder lower storage portion and the cab lower storage portion enter. It is desirable that the rotating frame supports the pair of front and rear support frames so as to rotate.

According to this configuration, the posture of the pair of front and rear support frames can be changed by the rotating frame. In particular, since the second guide groove extends inward in the left-right direction in the ascending / descending state, the operator rotates the ladder member outward in the left-right direction around the center axis of rotation, and then supports the first auxiliary. The member and the ladder member can be easily pushed along the second guide groove. On the other hand, in the retracted state, the second guide groove extends downward inward in the left-right direction due to the weight of the first auxiliary support member and the ladder member, so that the ladder member is intended by the operator due to vibration or inclination of the construction machine. On the contrary, it is possible to prevent it from popping out of the storage unit.

In the above configuration, it is desirable that the step has a grip portion that can be gripped by an operator who moves up and down between the step and the traveling surface through the ladder member in the elevating state.

According to this configuration, the operator can easily move up and down between the stepping platform and the traveling surface by gripping the grip portion provided on the stepping platform.

In the above configuration, the cab has a floor surface and a driver's seat installed on the floor surface to allow an operator to sit, and the step stool is located at a position where the step stool is lower than the floor surface of the cab. It is desirable that it is fixed to the upper frame so as to be arranged.

According to this configuration, since a step is formed between the step and the floor of the cab, the operator can gradually move between the step and the cab in the height direction, and the movement burden is reduced. Can be reduced.

In the above configuration, it is desirable that the tip of the step is arranged vertically above the outer surface of the shoe or inside the outer surface of the shoe in the outer direction.

According to this configuration, since the tip of the step does not protrude outward from the outer surface of the shoe, it is possible to easily satisfy the limitation in the width direction such as when transporting a construction machine.

In the above configuration, in the ladder support portion, the outer tip portion of the ladder member in the retracted state is arranged vertically above the shoe outer surface or inside the shoe outer surface in the outer direction. As such, it is desirable that the ladder member can be stored.

According to this configuration, since the tip end portion of the ladder member does not protrude outward from the outer surface of the shoe in the retracted state, it is possible to easily satisfy the limitation in the width direction such as when transporting the construction machine.

According to the present invention, in a construction machine in which the outer surface of the cab is arranged inside the outer surface of the crawler in the left-right direction, it is easy for the operator to move between the traveling surface and the cab without passing through the upper surface portion of the crawler. It will be possible to come and go to.

It is a side view of the construction machine which concerns on one Embodiment of this invention. It is a perspective view of the cab and the lower traveling body of the construction machine which concerns on 1st Embodiment of this invention. It is a perspective view of the cab, the ladder member and the ladder support part of the construction machine which concerns on 1st Embodiment of this invention. It is a perspective view of the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is in a state which can be raised and lowered. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view of the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is in a retracted state. It is a normal cross-sectional view of the state where the ladder member of the construction machine which concerns on 1st Embodiment of this invention is in a state which can be raised and lowered. It is a side view which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross section which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross section which shows the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross-sectional view of the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is in a retracted state. It is a perspective view of the state which the ladder member of the construction machine which concerns on 1st Embodiment of this invention is in a retracted state. It is a normal cross section in a state where the ladder member of the construction machine according to the second embodiment of the present invention is in a state where it can be raised and lowered. It is a perspective view of the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a state which can be raised and lowered. It is an enlarged perspective view of the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a state which can be raised and lowered. It is an exploded perspective view of the ladder member of the construction machine which concerns on 2nd Embodiment of this invention. It is a perspective view of the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a state which can be raised and lowered. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a perspective view of the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a retracted state. It is a normal cross-sectional view of the state where the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a state which can be raised and lowered. It is a normal cross-sectional view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross-sectional view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross-sectional view which shows the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is changed from the elevating state to the retracted state. It is a normal cross-sectional view of the state which the ladder member of the construction machine which concerns on 2nd Embodiment of this invention is in a retracted state.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
[Overall structure of construction machinery]
FIG. 1 shows a hydraulic excavator 100 which is an example of a construction machine on which a cab according to a first embodiment of the present invention is mounted. The hydraulic excavator 100 includes a crawler-type lower traveling body 1, an upper swivel body 2 (upper main body) rotatably supported by the lower traveling body 1, a working device 6 mounted on the upper swivel body 2, and the work device 6. To prepare for. The upper swing body 2 has an upper frame 21 connected to the lower traveling body 1 and a cab 7 mounted on the upper frame 21. The working device 6 is rotatably connected to a boom 3 undulatingly connected to the front end portion of the upper frame 21 (the right front end portion in the example shown in FIG. 1) and to the tip end portion of the boom 3. It includes an arm 4 and a bucket 5 rotatably connected to the tip of the arm 4.

The cab 7 is mounted on a portion (the left front portion in the example shown in FIG. 1) which is the front portion of the upper frame 21 and is adjacent to the boom 3 in the width direction of the upper frame 21, and is mounted on the hydraulic excavator. It constitutes a driver's cab for maneuvering. That is, in the cab 7, an operation for traveling the lower traveling body 1, turning the upper rotating body 2, and performing the working operation of the working device 6 is performed.

FIG. 2 is a perspective view of the cab 7 and the lower traveling body 1 (FIG. 1) of the hydraulic excavator 100 according to the present embodiment. FIG. 3 is a perspective view of the cab 7 of the hydraulic excavator 100, the ladder member 80, and the ladder support portion 90.

The lower traveling body 1 has a pair of left and right crawler units 10 (FIG. 2) capable of traveling on the traveling surface G, and a car body 11. As an example, the traveling surface G is the ground at the work site, but the traveling surface G may be a traveling path, a floor plate, or the like erected on the ground. The car body 11 is arranged at the center of the lower traveling body 1 and supports the upper frame 21 of the upper turning body 2 so as to be able to turn around a turning center axis (center line) extending in the vertical direction. The pair of left and right crawler units 10 are arranged on both the left and right sides of the car body 11 with the turning center axis interposed therebetween. In FIG. 2, only the crawler unit 10 on the left side appears.

The pair of left and right crawler units 10 have a crawler frame 12 and a crawler shoe 13, respectively. The crawler frame 12 is connected (connected) to the left and right side surfaces of the car body 11. The crawler shoe 13 is supported by the crawler frame 12 so as to be rotatable. The crawler shoe 13 has a shoe upper surface portion 13A and a shoe outer surface 13B (see FIG. 9). The shoe upper surface portion 13A is an upper surface portion of the crawler shoe 13 facing upward. The shoe outer surface 13B is a side surface of the crawler shoe 13 facing the outside in the left-right direction (outward direction away from the turning center axis). As shown in FIG. 2, since the crawler shoe 13 is a band-shaped member, the shoe outer surface 13B has an upper surface portion (shoe upper surface portion 13A) and a lower surface portion of the crawler shoe 13 on the outer side in the left-right direction. It is a virtual side that connects along the vertical direction.

The above-mentioned upper frame 21 (swivel frame) is a plate-shaped frame having an upper surface portion and a lower surface portion, and is arranged above the shoe upper surface portions 13A of the pair of left and right crawler units 10 at intervals. The upper frame 21 is supported by the car body 11 of the lower traveling body 1 so as to be able to turn around a turning center axis extending in the vertical direction.

In each of the following drawings including FIGS. 2 and 3, the upper swivel body with respect to the lower running body 1 is aligned (parallel) with the front-rear direction of the lower traveling body 1 and the front-rear direction of the upper swivel body 2. The explanation will be given based on the state where the turning angle of 2 is set to zero degree.

The cab 7 is fixed to the left front end portion of the upper surface portion of the upper frame 21. That is, the cab 7 is arranged at a position shifted to the left side of the turning center of the upper turning body 2. As described above, on the right side of the cab 7, the working device 6 is supported by the upper frame 21 so as to be undulating.

The cab 7 has a cab front surface portion 7A, a cab outer portion 7B (cab outer surface), and a floor plate 7C. The front surface portion 7A of the cab corresponds to the front surface of the cab 7, and the front window 71 is formed in the front surface portion 7A of the cab. The cab outer portion 7B corresponds to the left side surface of the cab 7, and the entrance / exit 72 is formed in the cab outer portion 7B. The boarding / alighting port 72 allows a worker who gets on / off the cab 7 to pass through the boarding / alighting port 72. Further, the cab outer portion 7B is inside the shoe outer surface 13B (FIG. 9) on the left side (one side) of the pair of left and right crawler units 10 in the left-right direction (right side, near the turning center axis). It is arranged in the left-right direction and faces the outside (left side, the outside direction).

The floor plate 7C constitutes the floor inside the cab 7.

Further, the cab 7 has an opening / closing door 73, an outer handrail 73A, an inner handrail 73B, a control box 76 (FIG. 3), and an armrest 77.

The opening / closing door 73 is attached to the outer side portion 7B of the cab so as to be slidable back and forth, and opens or seals the entrance / exit 72. The outer handrail 73A is arranged so as to extend in the vertical direction at the left front end portion of the cab 7, in other words, the portion where the cab front portion 7A and the cab outer portion 7B intersect. The inner handrail 73B is arranged so as to extend in the vertical direction inside the opening / closing door 73. The outer handrail 73A and the inner handrail 73B are gripped by an operator entering and exiting the cab 7. The control box 76 and the armrest 77 are installed on the floor plate 7C in the cab 7 and form a part of the driver's seat that allows the operator to sit.

The control box 76 has an operation lever (not shown) and a box body (not shown). The operation lever rotates back and forth and left and right in response to an operation by an operator seated in the driver's seat. The operation is an operation for turning the upper swivel body 2 and an operation for operating the working device 6. The box body is arranged so as to extend in the front-rear direction on the side of the driver's seat. The box body supports the operation lever and a pilot valve (not shown) that opens and closes in response to an operation of the operation lever, and is configured to cover the pilot valve, the hydraulic piping (not shown), electrical wiring, and the like. Ru. The armrest 77 is for supporting the left arm of the worker. A control box and an armrest similar to the control box 76 and the armrest 77 in FIG. 2 are also arranged on the right side portion in the cab 7.

Further, the upper swivel body 2 has a step 75 (step), a ladder member 80, and a ladder support portion 90.

FIG. 4 is a perspective view showing a state in which the ladder member 80 of the hydraulic excavator 100 according to the present embodiment is in a state where it can be raised and lowered. 5 to 8 are perspective views showing how the ladder member 80 is changed from the ascending / descending state to the retracted state. FIG. 9 is a normal cross-sectional view of the ladder member 80 in a state where it can be raised and lowered. 10 to 12 are side views showing how the ladder member 80 is changed from the ascending / descending state to the retracted state. 13 and 14 are a normal cross-sectional view and a perspective view of the ladder member 80 in the retracted state.

As shown in FIG. 2, the step 75 is arranged at the lower left of the cab 7 so as to overlap the entrance / exit 72 in the front-rear direction. Specifically, the step 75 has a step base end portion 75A (step base end portion) and a step tip portion 75B (step tip tip portion) (FIG. 9). The step base end portion 75A is fixed to the left side surface of the upper frame 21 below the entrance / exit 72 and above the shoe upper surface portion 13A (FIG. 9) so as to overlap the entrance / exit 72 in the front-rear direction (FIG. 9). On the other hand, the step tip portion 75B is a portion of the step 75 opposite to the step base end portion 75A in the left-right direction, and is arranged above the shoe outer surface 13B of the crawler unit 10 on the left side (FIG. 9). reference).

To further describe the structure of step 75 according to the present embodiment, step 75 has a step vertical wall 751, a step horizontal wall 752, and a pair of left and right step handrails 753 (grip portions).

As shown in FIGS. 2 and 9, the step 75 has a substantially L-shape when viewed from the front-rear direction, and the step vertical wall 751 extends in the vertical direction. In the present embodiment, the step vertical wall 751 constitutes the above-mentioned step base end portion 75A and is connected (fixed) to the upper frame 21. On the other hand, the step horizontal wall 752 extends in the horizontal direction (outside in the left-right direction) from the lower end portion of the step vertical wall 751. The step side wall 752 forms a tread portion of the step 75 that allows the operator to step on it. As shown in FIG. 9, the step 75 is fixed to the upper frame 21 so that the step side wall 752 (tread surface) is arranged at a position lower than the floor plate 7C of the cab 7.

The pair of left and right step handrails 753 connect the upper end portion of the step vertical wall 751 and the left end portion (outer end portion) of the step horizontal wall 752 in an L shape through the upper side and the side at the left and right end portions of the step 75. Each step handrail 753 can be gripped by an operator who moves up and down between the step 75 and the traveling surface G through the ladder member 80 which is in an ascending / descending state.

The ladder member 80 allows the operator to move up and down between the traveling surface G and the step 75. As shown in FIGS. 3 and 9, a state in which the ladder member 80 extends in the vertical direction between the step tip portion 75B and the traveling surface G on the lateral side of the shoe outer surface 13B in the left-right direction is defined as a state in which the ladder member 80 can be raised and lowered. Define. The ladder member 80 has a ladder upper end portion 80A which is an upper end portion of the ladder member 80 in the elevating state, and a ladder lower end portion 80B which is a lower end portion of the ladder member 80. Further, referring to FIG. 3, the ladder member 80 has a pair of left and right vertical members 801 and a plurality of horizontal members 802, a contact portion 803 (regulatory portion), and a pair of left and right ladder fulcrum portions 804.

The pair of left and right vertical members 801 are frame portions that extend in the vertical direction when the ladder member 80 can be raised and lowered. The upper end of each vertical member 801 is bent diagonally inward in the left-right direction. Therefore, referring to FIG. 9, a worker who climbs the ladder member 80 can easily place the tip of the foot on the step side wall 752 of the step 75 along the diagonal portion. The plurality of horizontal members 802 are arranged at intervals in the vertical direction, and the pair of left and right vertical members 801 are connected to each other in the front-rear direction. The contact portion 803 is arranged so as to project inward in the left-right direction from the lower end portions (ladder lower end portion 80B in FIG. 9) of the pair of left and right vertical members 801 in the elevating possible state. The contact portion 803 has a U-shape (U-shape) in a plan view. The contact portion 803 has a function of restricting the movement of the ladder member 80 inward (inward direction) in the left-right direction by contacting the crawler frame 12. The pair of left and right ladder fulcrum portions 804 are arranged at the upper end portions of the pair of left and right vertical members 801 (ladder upper end portion 80A in FIG. 9), and are shaft portions extending outward in the front-rear direction.

As shown in FIG. 3, the ladder support portion 90 is mounted on the lower surface portion of the upper frame 21. The ladder support portion 90 supports the ladder member 80 so that the ladder member 80 can change its state between the ascending / descending state and the retractable state described above. The ladder support portion 90 has a storage portion A1 (storage portion) capable of storing the ladder member 80 along the left-right direction below the cab 7 and the step 75 (see FIG. 13). The storage unit A1 includes a cab lower storage unit A2 and a step lower storage unit A3 (step lower storage unit). The step lower storage portion A3 is arranged between the step 75 and the shoe upper surface portion 13A when viewed from the front-rear direction. The cab lower storage portion A2 is arranged between the cab 7 (upper frame 21) and the shoe upper surface portion 13A when viewed from the front-rear direction, and communicates with the step lower storage portion A3 in the left-right direction. An opening AP (FIG. 3) capable of receiving the ladder member 80 is formed in the outer portion in the left-right direction of the step lower storage portion A3. The stored state is a state in which the ladder member 80 is stored across both the cab lower storage portion A2 and the step lower storage portion A3 along the left-right direction.

With reference to FIG. 3, the ladder support portion 90 has a pair of front and rear side plates 901, a top plate 902, and a support member 903. The pair of front and rear side plates 901 are attached to the lower surface portion of the upper frame 21 at intervals in the front-rear direction, and function as a support frame capable of supporting the ladder member 80. Each side plate 901 is formed with a guide groove 901A (first guide groove) that engages with the ladder fulcrum portion 804 so that the ladder fulcrum portion 804 of the ladder member 80 can move at least in the left-right direction. In particular, in the present embodiment, the guide groove 901A is formed so as to extend downward toward the inside in the left-right direction (right side of FIGS. 3 and 9). The left end portion of the guide groove 901A (the outer end portion in the left-right direction and the outer end portion in the outer direction) constitutes the rotation support portion 901A1 (FIG. 9). The rotation support portion 901A1 rotatably supports the ladder upper end portion 80A (ladder fulcrum portion 804) of the ladder member 80 around a rotation center axis extending in the front-rear direction. On the other hand, the right end portion (inner end portion in the left-right direction) of the guide groove 901A constitutes the ladder holding portion 901A3 (FIG. 3). The ladder holding portion 901A3 holds the ladder member 80 in the above-mentioned stored state. Further, the portion of the guide groove 901A between the rotation support portion 901A1 and the ladder holding portion 901A3 constitutes the storage guide portion 901A2 (FIG. 9). In the storage guide portion 901A2, the ladder upper end portion 80A of the ladder member 80 in a state of being rotated outward (outward) in the left-right direction around the rotation center axis (ladder fulcrum portion 804) from the elevating possible state is in the left-right direction. The ladder upper end portion 80A (ladder fulcrum portion 804) is guided at least in the left-right direction so that the step lower storage portion A3 and the cab lower storage portion A2 can be sequentially entered toward the inside (inward direction).

Next, the elevating state and the retractable state of the ladder member 80 according to the present embodiment, and the procedure for changing the elevating state to the retractable state of the ladder member 80 will be described.

With reference to FIGS. 3, 4 and 9, in the present embodiment, the entrance 72 formed on the cab outer side portion 7B of the cab 7 is inside the shoe outer surface 13B of the crawler unit 10 on the left side in the left-right direction. Have been placed. Even in such a configuration, since the step 75 extends to the region above the shoe outer surface 13B, the operator can pass the traveling surface G via the ladder member 80 without passing through the relatively unstable shoe upper surface portion 13A. Can go back and forth between the cab 7 and the cab 7. Further, when the ladder member 80 is in a liftable state, the ladder member 80 is arranged so as to extend in the vertical direction between the step tip portion 75B and the traveling surface G on the lateral side of the shoe outer surface 13B in the left-right direction. The person can easily move up and down between the step 75 and the traveling surface G. Further, when the ladder member 80 is not used, the ladder member 80 is stored in the retracted state to prevent the ladder member 80 from interfering with the operation of the hydraulic excavator 100. Further, in the stored state, since the step lower storage unit A3 and the cab lower storage unit A2 can cooperate to store the ladder member 80, the ladder member 80 is compared with the case where the ladder member 80 is stored only directly under the cab 7. Therefore, the ladder member 80 can be lengthened, and the ladder member 80 can be arranged in a wider range between the step 75 and the traveling surface G in the ascending / descending state. As a result, the operator can easily move back and forth between the traveling surface G and the cab 7 without passing through the shoe upper surface portion 13A.

Further, in the present embodiment, as shown in FIGS. 4 and 9, the contact portion 803 is arranged so as to project inward (inward direction) in the left-right direction from the lower end portion 80B of the ladder in the ascending / descending state. By abutting on the crawler frame 12, the movement of the ladder member 80 inward in the left-right direction is restricted. Therefore, it is possible to stably hold the relative position of the ladder member 80 with respect to the crawler unit 10 in the ascending / descending state, and it is possible to realize a safe ascending / descending work of the operator.

Further, in the present embodiment, as shown in FIG. 9, the portion between the ladder upper end portion 80A and the ladder lower end portion 80B of the ladder member 80 in the elevating state is outside in the left-right direction with respect to the shoe outer surface 13B. The amount of protrusion of the contact portion 803 with respect to the lower end portion 80B of the ladder is set so as to be arranged apart from each other (outward direction). Therefore, it is possible to prevent the ladder member 80 from interfering with the crawler shoe 13 in the ascending / descending state, and to prevent damage to at least one of the ladder member 80 and the crawler shoe 13.

Further, in the present embodiment, the pair of left and right guide grooves 901A are formed so as to extend downward toward the inside (inward direction) in the left-right direction. Therefore, when the ladder member 80 is in the retracted state, the ladder fulcrum portion 804 is arranged in a relatively low region of the guide groove 901A, that is, in the ladder holding portion 901A3 due to the weight of the ladder member 80, so that the hydraulic excavator 100 It is possible to prevent the ladder member 80 from jumping out of each storage portion due to vibration or inclination during the work.

Further, in the present embodiment, since the step 75 has a pair of left and right step handrails 753, the operator can more easily move up and down between the step 75 and the traveling surface G by grasping the step handrail 753. be able to.

Further, in the present embodiment, since the step 75 (step side wall 752) is arranged at a position lower than the floor plate 7C (floor surface) of the cab 7, there is a step between the step 75 and the floor plate 7C of the cab 7. (Stairs) are formed, and the operator can gradually move between the step 75 and the cab 7 in the height direction, and the movement load can be reduced.

When retracting the ladder member 80 from the elevating possible state shown in FIGS. 3, 4 and 9, the operator grasps the ladder member 80 and rotates it outward in the left-right direction around the ladder fulcrum portion 804 (FIGS. 5 and 9). See the arrow 10). Then, when the ladder member 80 is in a substantially horizontal posture on the outside in the left-right direction of the step 75, the operator pushes the ladder member 80 inward in the left-right direction (see the arrows in FIGS. 6, 7, 11, and 12). At this time, as shown in FIG. 10, since the upper end portion of the vertical member 801 (FIG. 3) of the ladder member 80 is bent diagonally inward in the left-right direction, the operator bends the bent portion in the left-right direction. When pushed inward, a part of the ladder member 80 can be temporarily supported by the support member 903 (FIG. 3), and the ladder member 80 can be easily retracted. As a result, as shown in FIGS. 8 and 13, the ladder member 80 is stored in the storage unit A1 (FIG. 13). At this time, the ladder fulcrum portion 804 of the ladder member 80 is supported by the ladder holding portion 901A3, and the ladder lower end portion 80B of the ladder member 80 is supported by the support member 903 (FIG. 3) of the ladder support portion 90. As a result, during the work of the hydraulic excavator 100, the ladder member 80 does not protrude significantly outward from the step 75 and the crawler unit 10 in the left-right direction, so that the work is prevented from being hindered. Further, as shown in FIG. 14, the operator can make the ladder member 80 the ladder support portion 90 by exposing the contact portion 803 of the ladder member 80 to the opening AP (FIG. 3) of the ladder support portion 90. Since it can be visually recognized from the outside of the hydraulic excavator 100 that it is stored in the ladder member 80, the stored state of the ladder member 80 can be easily confirmed and the ladder member 80 can be prevented from being lost. When the ladder member 80 is switched from the retracted state to the ascending / descending state, the reverse procedure of the above is executed.

As described above, in the present embodiment, the ladder support portion 90 is in a movable state with the rotation support portion 901A1 that rotatably supports the ladder upper end portion 80A (ladder fulcrum portion 804) around the rotation center axis extending in the front-rear direction. The ladder so that the upper end portion 80A of the ladder member 80 in a state of being rotated outward in the left-right direction around the rotation center axis can sequentially enter the step lower storage portion A3 and the cab lower storage portion A2. It has a storage guide portion 901A2 that guides the upper end portion 80A at least in the left-right direction. Therefore, the operator rotates the ladder member 80 in an ascending / descending state to the outside in the left-right direction around the rotation center axis, and then moves the ladder member 80 to the lower storage unit A3 and the cab while being guided by the storage guide unit 902A2. It can be easily stored in the lower storage unit A2.

In particular, in the present embodiment, since the guide grooves 901A formed in the pair of front and rear side plates 901 can also serve as the rotation support portion and the storage guide portion, the ladder member 80 is stated by the ladder support portion 90 having a simple structure. Can be changed and supported.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In this embodiment, the differences from the first embodiment will be mainly described, and the common points will be omitted. 15, 16 and 17 are a normal cross-sectional view, a perspective view and an enlarged perspective view in a state where the ladder member 80 of the hydraulic excavator 100 according to the present embodiment is in an ascending / descending state. FIG. 18 is an exploded perspective view of the ladder member 80 according to the present embodiment. FIG. 19 is a perspective view showing a state in which the ladder member 80 according to the present embodiment is in an ascending / descending state. 20 to 22 are perspective views showing how the ladder member 80 according to the present embodiment is changed from the ascending / descending state to the retracted state. FIG. 23 is a perspective view of the ladder member 80 according to the present embodiment in a retracted state. FIG. 24 is a normal cross-sectional view of the ladder member 80 in a state where it can be raised and lowered. 25 to 27 are normal cross-sectional views showing how the ladder member 80 is changed from the ascending / descending state to the retracted state. FIG. 28 is a normal cross-sectional view of the ladder member 80 in the retracted state.

In the present embodiment, the ladder member 80 has a U-shape (U-shape) that is opened upward in a side view (FIG. 18). The ladder member 80 has a pair of front and rear vertical members 801 and a horizontal member 802 that connects the lower ends thereof to each other. Holes 804S are formed along the front-rear direction at the upper ends of the pair of front-rear vertical members 801 (FIG. 18). A second fulcrum portion 96T, which will be described later, is inserted into the pair of front and rear hole portions 804S to form a rotation center axis in the rotation of the ladder member 80.

Further, in the present embodiment, the ladder support portion 90 (FIG. 18) includes a base frame 75S, a pair of front and rear frame connecting portions 75T (rotating frame), a storage frame 95, and a first ladder support member 96 (first ladder support member 96). It has an auxiliary support member) and a second ladder support member 97 (second auxiliary support member).

The base frame 75S is fixed to the lower surface portion of the upper frame 21, and the tip end portion thereof is connected to the step side wall 752 of the step 75 (FIG. 15). As described above, in the present embodiment, since the step 75 is fixed to the upper frame 21 even below the cab 7 via the base frame 75S, even if the operator repeatedly climbs on the step 75, the step 75 is fixed to the upper frame 21 for a long period of time. This prevents the step 75 from falling off.

The pair of front and rear frame connecting portions 75T connect the storage frame 95 and the base frame 75S so that the storage frame 95 can rotate around the storage frame fulcrum portion 95S (FIG. 18) extending in the front-rear direction. Specifically, each frame connecting portion 75T is interposed between the base frame 75S mounted on the frame fixing portion 21T of the upper frame 21 and the pair of front and rear side plates 951 (support frame), and the pair of front and rear side plates 951 is a storage frame. A pair of front and rear side plates 951 are supported so as to be rotatable around the fulcrum portion 95S. In the present embodiment, the frame connecting portion 75T supports the central portion in the left-right direction of each side plate 951.

The storage frame 95 forms a storage unit A1 (FIG. 28) capable of storing the ladder member 80. The storage frame 95 has a pair of front and rear side plates 951 (support frame) and support plates 952 and 953 for connecting the pair of side plates 951 to each other in the front-rear direction, respectively.

The pair of front and rear side plates 951 are mounted on the lower surface of the upper frame 21 via the pair of front and rear base frames 75S at intervals in the front-rear direction. The pair of front and rear side plates 951 can support the first ladder support member 96 and the ladder member 80. The pair of front and rear side plates 951 engages with the first fulcrum portion 96S (auxiliary fulcrum portion) (FIG. 18) of the first ladder support member 96 so as to be movable at least in the left-right direction. Guide grooves 951A (second guide grooves) are formed. As shown in FIG. 17, the end portion of the guide groove 951A in the left-right direction (outward direction) is arranged inside the step tip portion 75B in the left-right direction (position close to the turning center axis). A hole 951B is formed along the front-rear direction on the outside of the guide groove 951A in the left-right direction, that is, at the tip of each side plate 951 (FIG. 18).

In the present embodiment, the guide groove 951A formed in each side plate 951 functions as a storage guide portion, and guides the ladder member 80 (ladder upper end portion 80A) together with the first ladder support member 96 at least in the left-right direction.

The first ladder support member 96 is a member that rotatably supports the ladder member 80 around a rotation center axis (hole 804S) extending in the front-rear direction, and as shown in FIG. 18, it opens downward. It has a U-shape. The first ladder support member 96 has a pair of front and rear vertical members 961 and a horizontal member 962 that connects the upper ends of the pair of vertical members 961 to each other in the front-rear direction. A pair of first fulcrum portions 96S extending in the front-rear direction are arranged at both front and rear ends of the horizontal member 962 (the other ends of the first ladder support member 96). Further, a pair of second fulcrum portions 96T (rotating base end portions) extending in the front-rear direction are arranged at the lower end portions (one end portion of the first ladder support member 96) of the pair of front and rear vertical members 961. The pair of first fulcrum portions 96S are respectively inserted into the guide grooves 951A of the storage frame 95 described above. The pair of second fulcrum portions 96T are inserted into the holes 804S of the ladder member 80, respectively.

The second ladder support member 97 is rotatably supported by the tip end portion of the storage frame 95 and has a function of supporting the ladder member 80. As shown in FIG. 18, the second ladder support member 97 has a U-shape (U-shape) opened upward. The second ladder support member 97 has a pair of front and rear vertical plates 971 and a horizontal bar 972 that connects the lower ends of the pair of vertical plates 971 to each other. A shaft portion 97S is formed at the upper end portion of each vertical plate 971 along the front-rear direction. Each shaft portion 97S is inserted into the hole portion 951B on the outer side in the left-right direction (tip side in the outer direction) from the guide groove 951A, and is rotatably supported by the pair of front and rear side plates 951. Consists of the ends.

Further, a pair of bent portions 973 bent toward the outside in the left-right direction are formed at the lower end portion of each vertical plate 971. As shown in FIG. 17, the pair of bent portions 973 are arranged so as to sandwich the ladder member 80 from both the front and rear sides in a state where the ladder member 80 can be raised and lowered. Therefore, when the operator moves up and down, the position of the ladder member 80 in the front-rear direction is restricted, and the worker can safely move up and down. The horizontal bar 972 is made of a cylindrical member. The horizontal bar 972 may be rotatably supported by a pair of vertical plates 971 around a rotation center axis extending in the front-rear direction. Further, the horizontal bar 972 is arranged below the second fulcrum portion 96T (rotational support portion) and between the ladder member 80 and the shoe outer surface 13B in the elevating possible state, and the ladder member 80 is arranged in the vertical direction. It functions as an auxiliary support portion capable of supporting the ladder member 80 so as to maintain an extended posture.

When the operator retracts the ladder member 80 from the ascending / descending state shown in FIGS. 19 and 24, the operator grips the ladder member 80 and rotates outward in the left-right direction around the hole portion 804S and the second fulcrum portion 96T (FIG. 18). (See the arrows in FIGS. 20, 25, 26). When the ladder member 80 is in a substantially horizontal posture on the lateral side of the step 75 (FIGS. 21 and 26), the second ladder support member 97 moves upward together with the ladder member 80, and FIGS. 26 to 27. As shown in the above, the storage frame 95 rotates around the first fulcrum portion 96S (FIG. 18). Next, the operator pushes the ladder member 80 inward in the left-right direction from the state shown in FIG. 21 (see the arrows in FIGS. 27 and 28). As a result, as shown in FIGS. 23 and 28, the ladder member 80 is stored in the storage unit A1 (FIG. 28). At this time, the first fulcrum portion 96S of the first ladder support member 96 is supported by the ladder holding portion 951A2 (FIG. 18), and the ladder member 80 is supported by the support plates 952 and 953 (FIG. 18) of the ladder support portion 90. .. At this time, the storage frame 95 maintains the downward posture as shown in FIG. 28 due to the weight of the first ladder support member 96 and the ladder member 80. Then, as shown by the arrow in FIG. 28, the second ladder support member 97 is rotated upward with the shaft portion 97S and the hole portion 951B (FIG. 18) as fulcrums so as to surround the pair of step handrails 753 in step 75. Arranged (see arrow in FIG. 18).

As a result, during the work of the hydraulic excavator 100, the ladder member 80 does not protrude significantly outward from the step 75 and the crawler unit 10 in the left-right direction, so that the work is prevented from being hindered. Further, the operator visually recognizes that the ladder member 80 is stored in the ladder support portion 90 from the outside of the hydraulic excavator 100 by arranging the second ladder support member 97 so as to overlap the step 75. Therefore, the stored state of the ladder member 80 can be easily confirmed, and the ladder member 80 can be prevented from being lost. When the ladder member 80 is switched from the retracted state to the ascending / descending state, the reverse procedure of the above is executed.

With reference to FIGS. 19 and 24, also in this embodiment, the entrance / exit 72 formed on the cab outer side portion 7B of the cab 7 is arranged inside the shoe outer surface 13B of the crawler unit 10 on the left side in the left-right direction. ing. Even in such a configuration, since the step 75 extends to the region above the shoe outer surface 13B, the operator can pass the traveling surface G via the ladder member 80 without passing through the relatively unstable shoe upper surface portion 13A. Can go back and forth between the cab 7 and the cab 7. In particular, the shoe upper surface portion 13A is unstable compared to a cab 7 made of a rigid body due to the structure of the band-shaped crawler shoe 13, and is located at a position downward with respect to the cab 7, so that the operator can cab the cab. Great care must be taken when moving directly between the 7 and the shoe upper surface 13A. On the other hand, in this configuration, such a burden on the operator can be greatly reduced. Further, when the ladder member 80 is made to be able to move up and down, the ladder member 80 is arranged so as to extend in the vertical direction between the step tip portion 75B and the traveling surface G on the lateral side of the shoe outer surface 13B in the left-right direction as shown in FIG. Therefore, the operator can easily move up and down between the step 75 and the traveling surface G. Further, when the ladder member 80 is not used, when the ladder member 80 is put into the retracted state, the step lower storage portion A3 and the cab lower storage portion A2 cooperate with the ladder member 80 as shown in FIGS. 23 and 28. Therefore, it is possible to secure the length of the ladder member 80 as compared with the case where the ladder member 80 is stored only directly under the cab 7, and the step 75 and the step 75 can be raised and lowered. The ladder member 80 can be arranged in a wider range between the traveling surface G and the traveling surface G. As a result, the operator can easily move back and forth between the traveling surface G and the cab 7 without passing through the shoe upper surface portion 13A. In addition, since a hydraulic pipe (not shown) is arranged inside the cab 7 in the left-right direction, it is difficult to provide the storage portion of the ladder member 80 inside the storage portion A2 under the cab. There are many. In the present embodiment, in addition to the cab lower storage portion A2 as described above, the step lower storage portion A3 below the step 75 that facilitates the movement of the operator is effectively used to secure the length of the ladder member 80. can do. The same applies to the first embodiment.

Further, also in the present embodiment, the first ladder support member 96 in which the ladder support portion 90 rotatably supports the ladder upper end portion 80A (ladder fulcrum portion 804) (FIG. 15) around a rotation center axis extending in the front-rear direction. (Rotation support portion) and the ladder upper end portion 80A of the ladder member 80 in a state of being rotated outward in the left-right direction around the rotation center axis from the elevating possible state are connected to the step lower storage portion A3 and the cab lower storage portion A2. It has a guide groove 951A (storage guide portion) that guides the upper end portion 80A of the ladder at least in the left-right direction so that the ladder can be entered in order. Therefore, the operator rotates the ladder member 80 in an ascending / descending state to the outside in the left-right direction around the rotation center axis, and then moves the ladder member 80 under the step lower storage portion A3 and the cab while being guided by the guide groove 951A. It can be easily stored in the storage unit A2.

Further, in the present embodiment, the ladder member 80 is moved along the guide groove 951A (second guide groove) by moving the first ladder support member 96 (first auxiliary support member) that rotatably supports the ladder member 80. Can be stored in the step lower storage unit A3 and the cab lower storage unit A2, so that the relative postures of the first ladder support member 96 and the ladder member 80 can be changed during storage and storage, and in the stored state. The degree of freedom in the posture of the ladder member 80 can be increased.

Further, as shown in FIG. 17, when the outer end portion of the guide groove 951A in the left-right direction is arranged inside the step tip portion 75B in the left-right direction, the first ladder support member 96 is shown in FIG. As shown in 24, since the ladder member 80 is arranged so as to be inclined downward toward the outside (outward direction) in the left-right direction, the ladder member 80 is rotatably supported by such a first ladder support member 96. The posture may become unstable due to the above. On the other hand, according to the present embodiment, the horizontal bar 972 (auxiliary support portion) of the second ladder support member 97 supports the ladder member 80 so as to maintain a posture extending in the vertical direction as shown in FIG. Therefore, it is possible to prevent the posture of the ladder member 80 from becoming unstable as described above.

Further, in the present embodiment, in the elevating and lowering state of the ladder member 80, a pair of front and rear side plates 951 are arranged so that the guide groove 951A extends upward toward the inside in the left-right direction at least by the weight of the ladder member 80. (Fig. 24). On the other hand, when the ladder member 80 is changed from the elevating state to the retractable state, the first ladder support member 96 and the ladder member 80 enter the step lower storage portion A3 and the cab lower storage portion A2 along the guide groove 951A. Along with this, the storage frame 95 including the pair of front and rear side plates 951 extends toward the inside (inward direction) of the left-right direction inward (inward direction), and the storage frame 95 includes the storage frame fulcrum portion 95S (FIG. 18) (frame rotation center axis). ) The frame connecting portion 75T supports the pair of front and rear side plates 951 so as to rotate around.

According to such a configuration, the posture of the pair of front and rear side plates 951 can be changed by the frame connecting portion 75T. In particular, since the guide groove 951A extends upward toward the inside in the left-right direction in the ascending / descending state, the operator moves the ladder member 80 in the left-right direction around the rotation center axis (hole portion 804S, second fulcrum portion 96T). The first ladder support member 96 and the ladder member 80 can be easily pushed along the guide groove 951A after being rotated outward. On the other hand, in the retracted state, the guide groove 951A extends downward toward the inside in the left-right direction due to the weight of the first ladder support member 96 and the ladder member 80. It is possible to prevent the storage unit A1 from popping out against the intention of the operator. Further, according to the above configuration, the weight of the storage frame 95 can be used as a balancer to move the ladder member 80, so that the operation force of the operator can be reduced.

The construction machine according to the embodiment of the present invention has been described above. The present invention is not limited to these forms. The present invention can take, for example, the following modified embodiments.

(1) In the above embodiment, the hydraulic excavator 100 has been described as a construction machine, but the present invention is not limited thereto. The construction machine according to the present invention may have a structure other than the hydraulic excavator. Further, the upper main body according to the present invention may not turn with respect to the lower traveling body 1. In this case, the front-rear direction of the upper body and the front-rear direction of the lower traveling body 1 coincide with each other.

(2) A member similar to the contact portion 803 according to the first embodiment may be provided at the lower end portion of the ladder member 80 according to the second embodiment shown in FIG. 15 and may come into contact with the crawler frame 12.

(3) In each of the above embodiments, the cab 7 is arranged on the left side of the crawler unit 10, but the cab 7 may be arranged on the right side of the crawler unit 10.

(4) A rail or the like may be arranged in place of the guide groove 901A and the guide groove 951A in each of the above embodiments.

(5) In FIG. 9, the step tip portion 75B of the step 75 may be arranged vertically above the shoe outer surface 13B of the crawler shoe 13 or inside the shoe outer surface 13B in the left-right direction (outer direction). In this case, since the step tip portion 75B does not protrude outward (outward) in the left-right direction from the shoe outer surface 13B, the limitation in the width direction such as when the hydraulic excavator 100 (construction machine) is transported can be easily satisfied. At the same time, it is possible to prevent the step 75 from interfering with the surrounding members. The same applies to the second embodiment shown in FIG.

(6) Further, in FIG. 9, the ladder support portion 90 (FIG. 3) is a ladder so that the tip portion in the left-right direction (outer direction) of the ladder member 80 in the retracted state is arranged vertically above the shoe outer surface 13B. Although the member 80 is stored, the ladder member 80 may be stored so that the tip end portion of the ladder member 80 is arranged inside the shoe outer surface 13B in the left-right direction. Even in such a case, since the tip end portion of the ladder member 80 does not protrude outward in the left-right direction from the shoe outer surface 13B in the retracted state, the limitation in the width direction such as when the hydraulic excavator 100 is transported can be easily satisfied. At the same time, it is possible to prevent the ladder member 80 at the time of storage from interfering with the surrounding members. The same applies to the second embodiment shown in FIG. 28.

1 Lower traveling body 10 Crawler unit 100 Excavator (construction machinery)
11 Car body 12 Crawler frame 13 Crawler shoe 13A Shoe upper surface 13B Shoe outer surface 2 Upper swivel body (upper body)
21 Upper frame 6 Work equipment 7 Cab 71 Front window 72 Entrance / exit 73 Open / close door 75 Step (step)
753 Step handrail (grip part)
75A Step base end (step base end)
75B Step tip (step tip)
75S Support frame 75T Frame connection (rotating frame)
7A cab front part 7B cab outer part (cab outer surface)
7C floor plate (floor surface)
80 Ladder member 803 Contact part (regulatory part)
804 Ladder fulcrum 804S Hole 80A Ladder upper end 80B Ladder lower end 90 Ladder support 901 Side plate (support frame)
901A guide groove (first guide groove)
901A1 Rotation support part 901A2 Storage guide part 95 Storage frame 951 Side plate (support frame)
951A guide groove (second guide groove, storage guide section)
951B Hole 95S Storage frame fulcrum 96 1st ladder support member (1st auxiliary support member)
96S 1st fulcrum part (auxiliary fulcrum part)
96T 2nd fulcrum part (rotation support part)
97 Second ladder support member (second auxiliary support member)
971 Vertical plate 972 Horizontal bar (auxiliary support)
97S hole (rotating base end)
A1 storage unit A2 cab lower storage unit A3 step lower storage unit (step lower storage unit)

Claims (13)

It ’s a construction machine,
A lower traveling body having a car body including a center line extending in the vertical direction and a pair of left and right crawler units arranged on both left and right sides of the car body and capable of traveling on a traveling surface.
The upper body supported by the car body of the lower traveling body and the upper body
Equipped with
One of the crawler units of the pair of left and right crawlers of the lower traveling body is
The crawler frame connected to the car body and
A crawler shoe that is rotatably supported by the crawler frame and includes an upper surface portion of the shoe facing upward and an outer surface of the shoe facing outward, which is a direction away from the center line in the left-right direction.
Have,
The upper body
An upper frame having an upper surface portion and a lower surface portion and arranged above the upper surface portion of the shoe at intervals.
A cab fixed to the upper surface portion of the upper frame, the cab is arranged at a position closer to the center line than the shoe outer surface when viewed from the front-rear direction, and has a cab outer surface facing the outer direction. A cab having an entrance on the side surface that allows workers to get on and off the cab to pass through,
A step stool arranged so as to overlap the entrance / exit in the front-rear direction, at the step base end portion fixed to the upper frame above the shoe upper surface portion, and on the opposite side of the step basin base end portion in the left-right direction. A stepping stone having a stepping stone tip located above the outer surface of the shoe,
A ladder member that allows an operator to move up and down between the traveling surface and the stepping stone,
The stepladder lower storage portion arranged between the stepladder and the shoe upper surface portion when viewed from the front-rear direction, and the stepladder lower storage portion arranged between the cab and the shoe upper surface portion when viewed from the front-rear direction. A ladder support portion that has a storage portion under the cab that communicates with the ladder member and supports the ladder member so that the ladder member can change its state between the elevating and lowering state and the retractable state. The ladder member extends in the vertical direction between the tip of the step and the traveling surface, and the stored state is such that the ladder member extends in the left-right direction of the cab lower storage portion and the step lower storage portion. A ladder support part that is stored across both storage parts,
Has, construction machinery. The ladder member has a ladder upper end portion which is an upper end portion of the ladder member in the elevating state.
The ladder support is
A rotation support portion that rotatably supports the upper end portion of the ladder around a rotation center axis extending in the front-rear direction, and a rotation support portion.
The upper end of the ladder of the ladder member in a state of being rotated in the outward direction around the rotation center axis from the elevating possible state is retracted under the step toward the inner direction opposite to the outer direction in the left-right direction. A storage guide portion that guides the upper end portion of the ladder at least in the left-right direction so that the portion and the storage portion under the cab can be sequentially entered.
The construction machine according to claim 1, further comprising. The ladder member is
The lower end of the ladder, which is the lower end of the ladder member in the elevating state, and the lower end of the ladder,
A restricting portion that is arranged so as to project inward from the lower end of the ladder in the elevating state and that regulates the inward movement of the ladder member by abutting against the crawler frame.
The construction machine according to claim 2, further comprising. With respect to the lower end of the ladder so that the portion of the ladder member in the elevating state between the upper end of the ladder and the lower end of the ladder is arranged so as to be spaced apart from the outer surface of the shoe in the outward direction. The construction machine according to claim 3, wherein the protrusion amount of the regulation unit is set. The ladder member has a pair of front and rear ladder fulcrums arranged at the upper end of the ladder and extending in the front-rear direction, respectively.
The ladder support portion is a pair of front and rear support frames that are attached to the lower surface portion of the upper frame at intervals in the front-rear direction and can support the ladder member, and the front and rear pair of support frames have the same. Further having a pair of front and rear support frames, each of which is formed with a first guide groove that engages with the ladder fulcrum so that the ladder fulcrum can move at least in the left-right direction.
The rotation support portion is composed of the outward end portion of the first guide groove.
The construction machine according to any one of claims 2 to 4, wherein the storage guide unit is configured by the first guide groove. The construction machine according to claim 5, wherein the first guide groove is formed so as to extend downward inward. The ladder support is
It has one end including the rotation support and a pair of auxiliary fulcrums arranged at the other end opposite to the one end and extending in the front-rear direction, and rotates the upper end of the ladder around the rotation center axis. The first auxiliary support member that supports as much as possible,
A pair of front-rear support frames that are attached to the lower surface portion of the upper frame at intervals in the front-rear direction and can support the first auxiliary support member and the ladder member, and are attached to the front-rear pair of support frames. Refers to a pair of front and rear support frames in which a second guide groove that engages with the auxiliary fulcrum portion is formed so that the auxiliary fulcrum portion of the first auxiliary support member can move at least in the left-right direction. ,
Further have
The construction according to any one of claims 2 to 4, wherein the storage guide portion is composed of the second guide groove and guides the upper end portion of the ladder together with the first auxiliary support member along at least in the left-right direction. machine. The outward end of the second guide groove is arranged at a position closer to the center line in the left-right direction than the tip of the step.
The ladder support portion further has a second auxiliary support member.
The second auxiliary support member is
A pair of front-rear rotation base ends rotatably supported by the pair of front-rear support frames on the tip side in the outward direction from the second guide groove, and a pair of front-rear rotation base ends.
In the elevating state, the ladder member is arranged below the rotation support portion and between the ladder member and the shoe outer surface, and supports the ladder member so as to maintain a posture in which the ladder member extends in the vertical direction. With an auxiliary support that can be used
The construction machine according to claim 7. The ladder support portion is interposed between the upper frame and the pair of front and rear support frames, and the pair of front and rear supports so that the pair of front and rear support frames can rotate around a frame rotation center axis extending in the front-rear direction. It also has a rotating frame that supports each of the frames.
In the elevating state of the ladder member, the pair of front and rear support frames are arranged so that the second guide groove extends upward inward by at least the weight of the ladder member, while the ladder is arranged. When the member is changed from the elevating state to the retractable state, the first auxiliary support member and the ladder member enter the stepping platform lower storage portion and the cab lower storage portion along the second guide groove. Along with this, the pair of front and rear rotating frames rotate around the center axis of rotation of the frame until the second guide groove extends inwardly downward. The construction machine according to claim 7 or 8, respectively, which supports the support frames of the above. Any of claims 1 to 9, wherein the step has a grip portion that can be gripped by an operator who moves up and down between the step and the traveling surface through the ladder member in the elevating state. The construction machine described in paragraph 1. The cab has a floor surface and a driver's seat installed on the floor surface and allowing an operator to sit on the floor surface.
The construction machine according to any one of claims 1 to 10, wherein the step is fixed to the upper frame so that the step is arranged at a position lower than the floor surface of the cab. The construction machine according to any one of claims 1 to 11, wherein the step tip portion is arranged vertically above the shoe outer surface or inside the shoe outer surface in the outer direction. The ladder support portion is such that the outward tip portion of the ladder member in the retracted state is arranged vertically above the shoe outer surface or inside the shoe outer surface in the outer direction. The construction machine according to any one of claims 1 to 12, wherein the member can be stored.

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