Work Machine

Abstract

To lower a working scaffold than before when the boom is in the collapsed state.SOLUTION: A boom side step 63 is arranged so as to form a passage together with a main body side step 61 when a boom 20 is in the collapsed state. The boom side step 63 is located in at least one of [A] a position extending parallel to a lower side Z2 of a machine body 10 when the boom 20 is in the collapsed state and is closer to a ventral surface 20c than a back surface 20d of the boom 20, [B] a position extending parallel to the back surface 20d and closer to the ventral surface 20c than the back surface 20d, [C] a position along the ventral surface 20c when viewed from a lateral direction Y, and [D] the position of Z2 below the ventral surface 20c when the boom 20 is in the collapsed state.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work machine provided with steps that serve as a working foothold for an operator. [Background technology]

[0002] For example, a work machine having a conventional step is described in Patent Document 1. In the technology described in this document, a step is provided so that an operator can move from the machine body, through the side of the boom, to the back of the boom (see Figures 2 and 3 of the document, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5569557 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in this document, it is assumed that a worker will work on the back of the boom in the collapsed state, which causes a problem that the work platform is located high.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a work machine that can lower the work platform when the boom is in a lowered state compared to conventional methods. [Means for solving the problem]

[0006] The working machine includes a machine body, a boom, a body-side step, and a boom lateral step. The boom is attached to the machine body so as to be capable of being raised and lowered. The body-side step is provided on the machine body. The boom lateral step is provided separately from the body-side step, and is arranged laterally outward of the boom. The boom lateral step is arranged so as to form a passage together with the body-side step when the boom is in a lowered state. The boom lateral step is arranged at least in any one of the following positions [A], [B], [C], and [D]. [A] A position closer to the ventral surface of the boom than the back surface of the boom, and extending parallel to the lower surface of the machine body when the boom is in a lowered state. [B] A position closer to the ventral surface of the boom than the back surface, and extending parallel to the back surface. [C] A position along the ventral surface when viewed from the side. [D] A position lower than the ventral surface when the boom is in a lowered state. Effect of the Invention

[0007] With the above-described configuration, the work platform when the boom is in the lowered state can be lowered than in the conventional case. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a view of a working machine 1 of a first embodiment as viewed from an upper side Z1. [Diagram 2] 2 is a view of the work machine 1 shown in FIG. 1 as viewed from a lateral direction Y. FIG. [Diagram 3] 1 is a diagram showing a work machine 201 of a second embodiment as viewed from a lateral direction Y. FIG. [Figure 4] 4 is a cross-sectional view taken along the line F4-F4 in FIG. 3. [Diagram 5] FIG. 11 is a diagram of a working machine 301 according to a third embodiment as viewed from the lateral direction Y, showing a boom side step 363 in an extended state. [Figure 6] 5 when the boom side step 363 shown in FIG. 5 is in the stored state. [Figure 7] 5. FIG. [Figure 8]7 is a cross-sectional view taken along the line F8-F8 in FIG. 6. [Figure 9] FIG. 11 is a view of a work machine 401 according to a fourth embodiment, as viewed from the upper side Z1. [Figure 10] 10 is a diagram of the work machine 401 shown in FIG. 9 as viewed from the lateral direction Y. [Figure 11] FIG. 11 is a view of a work machine 501 according to a fifth embodiment, as viewed from the upper side Z1. [Figure 12] 12 is a diagram of the work machine 501 shown in FIG. 11 as viewed from the lateral direction Y. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) A work machine 1 of a first embodiment will be described with reference to Figs. 1 and 2.

[0010] 2, the work machine 1 is a machine that performs work, such as a construction machine that performs construction work, and is, for example, a crane that performs work using a boom 20. The work machine 1 includes a machine body 10, the boom 20, a boom hoisting cylinder 30, boom-mounted equipment 40, and a lifting device 50.

[0011] The machine body 10 is the main body of the work machine 1. The machine body 10 includes a lower traveling body 11, a rotating device 12, and an upper rotating body 13. The lower traveling body 11 is provided with a traveling device and allows the work machine 1 to travel. The lower traveling body 11 may include crawlers or wheels. When the work machine 1 is a crane, the work machine 1 may be a crawler crane or a wheel crane.

[0012] The slewing device 12 (slewing bearing) connects the lower running body 11 and the upper rotating body 13 so that the upper rotating body 13 can rotate with respect to the lower running body 11.

[0013] The upper rotating body 13 is mounted on the lower travel body 11 so as to be capable of rotating. A boom 20 and the like are attached to the upper rotating body 13. As shown in FIG. 1, the upper rotating body 13 includes a cab 13a and an anti-cab front portion 13c. The cab 13a is a portion where an operator can operate the work machine 1. The anti-cab front portion 13c is a portion of the upper rotating body 13 that is forward X1 of the center of the upper rotating body 13 in the front-rear direction X and is on the opposite side to the cab 13a side with respect to the boom 20. For example, as shown in FIG. 2, the anti-cab front portion 13c includes an inclined surface 13c1. The inclined surface 13c1 is inclined with respect to the up-down direction Z and the front-rear direction X so as to be disposed on the upper side Z1 toward the rear side X2 (so as to rise rearward).

[0014] (direction) A direction related to the work machine 1 that coincides with the vertical direction when the work machine 1 is placed on a horizontal plane is defined as the up-down direction Z (upper side Z1, lower side Z2). A direction in which the rotation axis of the boom 20 for raising and lowering relative to the machine body 10 (more specifically, the upper rotating body 13) extends is defined as the lateral direction Y. As shown in FIG. 1, in the lateral direction Y, a side approaching the center of the boom 20 in the lateral direction Y is defined as the lateral inner side Y1. In the lateral direction Y, a side away from the center of the boom 20 in the lateral direction Y is defined as the lateral outer side Y2. A direction perpendicular to each of the up-down direction Z and the lateral direction Y is defined as the front-rear direction X. In the front-rear direction X, a direction in which the boom 20 protrudes relative to the machine body 10 (more specifically, the upper rotating body 13) when the boom 20 is in a lying state (described later) is defined as the front side X1, and the opposite side is defined as the rear side X2.

[0015] The boom 20 is attached to the upper rotating body 13 shown in FIG. 2 so as to be capable of being raised and lowered. The central axis of the boom 20 extending in the longitudinal direction of the boom 20 (boom longitudinal direction) is defined as a boom central axis 20a. The boom 20 can be in a lying position (lying state) so that the boom central axis 20a extends horizontally or approximately horizontally. For example, the boom 20 may be telescopic or non-telescopic. The boom 20 may have a box-shaped structure or a lattice structure. For example, the boom 20 is provided so as to extend linearly (the boom central axis 20a is linear). The boom 20 includes a ventral surface 20c, a rear surface 20d, and a side surface 20e. When the boom 20 is a telescopic boom, the boom 20 includes a basic boom 21 and a tip boom 23.

[0016] The ventral surface 20c is the surface that becomes the lower surface (lower side Z2 surface) of the boom 20 when the boom 20 is in the laid-down state. The rear surface 20d is the surface that becomes the upper surface (upper side Z1 surface) of the boom 20 when the boom 20 is in the laid-down state. The side surface 20e is a surface that connects the rear surface 20d and the ventral surface 20c, and is located on the lateral outer side Y2 portion of the boom 20. The case where the boom 20 is in the laid-down state will be described below.

[0017] The basic boom 21 is attached to the upper rotating body 13. The tip side boom 23 is inserted into the basic boom 21. The tip side boom 23 protrudes to the front side X1 beyond the basic boom 21. The number (number of stages) of the tip side boom 23 may be one stage or multiple stages.

[0018] The boom hoisting cylinder 30 raises and lowers the boom 20 relative to the upper rotating body 13. The boom hoisting cylinder 30 is positioned to support the boom 20 from the lower side Z2. The boom hoisting cylinder 30 is positioned to face the boom 20 in the up-down direction Z. The boom hoisting cylinder 30 is positioned to extend in the front-rear direction X when the boom 20 is in the lowered state. The boom hoisting cylinder 30 is attached to the upper rotating body 13 and the boom 20. The boom hoisting cylinder 30 is rotatably attached to each of the upper rotating body 13 and the boom 20. The direction in which the rotation axis of the boom hoisting cylinder 30 extends relative to each of the upper rotating body 13 and the boom 20 is the lateral direction Y. The boom hoisting cylinder 30 is extendable and is specifically a hydraulic cylinder. The boom hoisting cylinder 30 includes a cylinder tube 31 and a cylinder rod 33. The cylinder rod 33 protrudes from the cylinder tube 31 to the front side X1. The cylinder rod 33 is movable relative to the cylinder tube 31 in the longitudinal direction of the boom hoisting cylinder 30 .

[0019] The boom-mounted equipment 40 is equipment mounted (installed) on the boom 20. The boom-mounted equipment 40 is mounted on the back surface 20d of the boom 20. For example, the boom-mounted equipment 40 includes a winch 41, a rope 43, and a sheave 45.

[0020] The winch 41 winds up and pays out the rope 43. For example, the winch 41 is mounted on the rear side X2 portion of the boom 20 (the portion X2 rearward of the center in the front-rear direction X). Only one winch 41 may be provided, or multiple winches 41 (two in FIG. 2) may be provided. For example, the winch 41 includes a rear winch 41a and a front winch 41b. The front winch 41b is disposed on the front side X1 of the rear winch 41a.

[0021] The rope 43 is attached to, for example, a hook (not shown), and the hook is suspended from, for example, the boom 20. The rope 43 is arranged so as to run along (for example, parallel or approximately parallel to) the back surface 20d of the boom 20. The rope 43 is arranged so as to extend from the winch 41 to the tip end (front X1 end) of the boom 20. The rope 43 is a wire rope.

[0022] The sheave 45 (guide sheave) guides the rope 43. The sheave 45 may support the rope 43, or may change the direction of the rope 43.

[0023] The lifting device 50 is a device that enables a worker to ascend and descend between a position to the side of the boom 20 and the ground G. The lifting device 50 is a device that enables a worker to work at a position to the side of the boom 20. The lifting device 50 includes a step 60. The lifting device 50 may include a bracket (described later) that fixes the step 60 to the boom 20 or the like. The step 60 is a foothold that is stepped on by the worker. The step 60 includes a main body side step 61 and a boom side step 63.

[0024] The body side step 61 is provided on the machine body 10. The body side step 61 is provided on at least the upper revolving body 13. The body side step 61 may be provided on the lower traveling body 11. For example, at least a part of the body side step 61 may be provided on the front part 13c on the opposite side to the cab. At least a part of the body side step 61 may be provided on the inclined surface 13c1. The body side step 61 may be provided on a part other than the inclined surface 13c1. The body side step 61 may be provided on a part other than the front part 13c on the opposite side to the cab. The body side step 61 may be disposed on the rear X2 part of the upper revolving body 13 (for example, a part on the rear X2 side of the rear X2 end of the boom 20). For example, if there is a space between the boom 20 and the cab 13a to dispose the body side step 61, the body side step 61 may be disposed on this part.

[0025] This main body side step 61 may have a step-like portion or a ladder-like portion (not shown). The main body side step 61 may be provided on the surface (guard) of the upper rotating body 13, or may be a member (such as a plate-like member) attached to the upper rotating body 13. Only one main body side step 61 may be provided (see FIG. 3), or multiple steps (two (two steps) in FIG. 2) may be provided.

[0026] The boom side step 63 is configured so that it can be used as a scaffold (work scaffold) when a worker performs work on the boom 20 (e.g., the back surface 20d). At least a part of the boom side step 63 is arranged laterally outward Y2 from the boom 20 as shown in FIG. 1. The boom side step 63 is provided separately from the main body side step 61. In other words, the steps 60 provided on the machine main body 10 are not included in the boom side step 63 even if they are arranged laterally outward Y2 from the boom 20.

[0027] The boom side step 63 is disposed so as to protrude laterally outward Y2 with respect to the boom 20 when viewed from the upper side Z1. For example, the laterally inner Y1 end of the boom side step 63 may be at the same or approximately the same position in the lateral direction Y with respect to the side surface 20e on the boom side step 63 side, and may be on the laterally inner Y1 side or on the laterally outer Y2 side. The above-mentioned "side surface 20e on the boom side step 63 side" is the side surface 20e on which the boom side step 63 is disposed, out of the two side surfaces 20e and 20e of the boom 20. If a worker riding on the boom side step 63 can perform work on the boom 20 (for example, the back surface 20d), the boom side step 63 may be disposed with a gap in the lateral direction Y between the boom side step 63 and the boom 20 when viewed from the upper side Z1. The boom side step 63 in the case where there is such a gap is also included in the above-mentioned "disposed so as to protrude laterally outward Y2 with respect to the boom 20".

[0028] This boom side step 63 is disposed at least in any one of the following positions [Position A], [Position B], [Position C], and [Position D].

[0029] [Position A] As shown in FIG. 2, the boom side step 63 may be disposed at a position that is closer to the ventral surface 20c than the rear surface 20d and that extends parallel (including approximately parallel) to the surface of the lower side Z2 of the machine body 10 when the boom 20 is in the lowered state. In this case, when the ground G extends horizontally or approximately horizontally, the boom side step 63 is disposed so as to extend horizontally or approximately horizontally. The above "parallel" includes approximately parallel, and this also applies to "parallel" below. The above "ventral surface 20c side than the rear surface 20d" refers to a position on the lower side Z2 of the rear surface 20d when the rear surface 20d is disposed so as to extend horizontally (the same applies to [Position B] below). The above "ventral surface 20c side than the rear surface 20d" includes a position on the lower side Z2 of the rear surface 20d and on the upper side Z1 of the ventral surface 20c when the rear surface 20d is disposed so as to extend horizontally (the same applies to [Position B] below). The above "on the ventral surface 20c side of the back surface 20d" includes a position on the lower side Z2 of the ventral surface 20c when the back surface 20d is arranged to extend horizontally (the same applies to [position B] below). The above "lower side Z2 surface of the machine body 10" is a surface of the machine body 10 that comes into contact with the ground G, specifically, for example, a surface of the lower traveling body 11 that comes into contact with the ground G. When the boom 20 is in the lowered state, the back surface 20d (or the boom central axis 20a) does not need to be arranged to extend horizontally (see FIG. 3). When the boom 20 is in the lowered state and the back surface 20d is inclined relative to the horizontal direction (see FIG. 3), the boom side step 63 may be arranged at a position extending parallel to the lower side Z2 surface of the machine body 10.

[0030] [Position B] The boom side step 63 may be disposed on the ventral surface 20c side of the rear surface 20d and at a position extending parallel to the rear surface 20d. In this case, when the rear surface 20d is disposed so as to extend in the horizontal or substantially horizontal direction, the boom side step 63 is disposed so as to extend in the horizontal or substantially horizontal direction.

[0031] [Position C] The boom side step 63 may be disposed at a position along the abdomen surface 20c of the boom 20 when viewed from the lateral direction Y.

[0032] [Position D] The boom side step 63 may be disposed at a position Z2 below the ventral surface 20c when the boom 20 is in the lowered state (see FIG. 3). The above "position Z2 below the ventral surface 20c" refers to a position Z2 below the ventral surface 20c when the back surface 20d (or the ventral surface 20c) is disposed to extend horizontally.

[0033] Here, a case will be described in which the boom side step 63 is disposed at a position (position C above) along the ventral surface 20c of the boom 20 when viewed from the lateral direction Y. In this case, the boom side step 63 is disposed so as to extend in the same or substantially the same direction as the extension of the ventral surface 20c when viewed from the lateral direction Y. The boom side step 63 is disposed so as to extend parallel to the extension direction of the boom central axis 20a. For example, the boom side step 63 may be disposed so as to overlap with the ventral surface 20c when viewed from the lateral direction Y. For example, the entire boom side step 63 may be disposed so as to overlap with the ventral surface 20c when viewed from the lateral direction Y.

[0034] As shown in FIG. 1, the boom side step 63 is arranged to form a passage together with the body side step 61. More specifically, the boom side step 63 and the body side step 61 are arranged on the same side in the lateral direction Y with respect to the boom 20. Specifically, the boom side step 63 and the body side step 61 are arranged on the opposite side of the cab 13a with respect to the boom 20. If there is a space between the boom 20 and the cab 13a, the boom side step 63 and the body side step 61 may be arranged on the cab 13a side with respect to the boom 20. For example, the interval between the body side step 61 and the boom side step 63 is set to be within the range of the stride of the worker. For example, the rear side X2 end of the boom side step 63 is arranged on the rear side X2 of the front side X1 end of the body side step 61. In the example shown in FIG. 1, the position of the rear side X2 end of the boom side step 63 in the front-rear direction X is approximately the same as the position of the body side step 61, which is the second step from the lower side Z2, in the front-rear direction X.

[0035] The position of the boom side step 63 in the front-rear direction X is set so that an operator can easily perform work on the boom-mounted equipment 40. For example, as shown in FIG. 2, the boom side step 63 is preferably disposed below the winch 41. For example, the rear X2 end of the boom side step 63 is disposed on the rear side X2 of the front X1 end of the rear winch 41a. For example, the front X1 end of the boom side step 63 is disposed on the front side X1 of the front X1 end of the winch 41 (more specifically, the front winch 41b). For example, the front X1 end of the boom side step 63 is disposed near the front X1 end of the basic boom 21.

[0036] This boom side step 63 may be attached to the boom 20 or to the boom hoisting cylinder 30 (see FIG. 3, described later). For example, the boom side step 63 may be attached to the abdominal surface 20c or to the side surface 20e. The boom side step 63 is attached to, for example, the basic boom 21. The boom side step 63 is, for example, a plate-like member. Only one boom side step 63 may be provided, or multiple boom side steps 63 may be provided. In the example shown in FIG. 2, two boom side steps 63·63 are provided lined up in the fore-aft direction X.

[0037] (Worker movement route, work, etc.) For example, the step 60 is configured (arranged) so that an operator can climb up the step 60 as follows. The operator climbs up the lower travelling body 11 from the ground G, and then climbs up the main body side step 61 from the lower travelling body 11. When the main body side step 61 is provided in a plurality of stages, the operator climbs up the main body side step 61. Then, the operator moves from the main body side step 61 to the boom side step 63. The operator can perform work on the boom side step 63. The work performed on the boom side step 63 may be, for example, work related to the boom 20, for example, work related to the back surface 20d of the boom 20, or for example, work related to the boom-mounted equipment 40 (inspection, repair, etc.). When the operator descends from the boom side step 63 to the ground G, the operator follows a route that is the opposite to the route when ascending from the ground G to the boom side step 63. FIG. 2 also shows an example of the size of the operator (W) when the operator stands on the boom side step 63.

[0038] (Amount of movement of workers) When the worker needs to climb onto the rear surface 20d of the boom 20, the worker needs to move in the vertical direction Z from the ground surface G to the rear surface 20d of the boom 20. On the other hand, when the worker climbs onto the boom side step 63, the amount of movement in the vertical direction Z can be reduced compared to when the worker needs to climb onto the rear surface 20d. Therefore, the burden on the worker caused by the movement can be reduced.

[0039] When the worker moves (makes a large detour) from the front X1 portion of the upper rotating body 13 shown in FIG. 1 to a position (the rear X2 portion of the upper rotating body 13) on the rear side X2 of the boom 20, and then climbs up to the rear surface 20d of the boom 20, the worker's movement path is long. On the other hand, when the worker climbs up to the boom side step 63 from the main body step 61 on the front X1 portion of the upper rotating body 13, the worker does not need to move to the rear X2 of the boom 20. Specifically, the worker can move in the lateral direction Y from the main body step 61 to the boom side step 63 at a position on the front X1 side of the rear X2 end of the boom 20. Therefore, in this case, the worker's movement path as viewed from above is shorter than when the worker makes a detour to the rear X2 portion of the upper rotating body 13. Therefore, the burden on the worker caused by the movement can be reduced.

[0040] (Safety belt anchor) When a worker works at a height, an anchor for attaching a safety belt needs to be provided on the work machine 1. When the worker climbs up to the back surface 20d of the boom 20 shown in FIG. 2 to work, the anchor needs to be provided at a position higher than the back surface 20d of the boom 20 and away from the back surface 20d. Therefore, the anchor needs to be configured so as to ensure sufficient strength, which may be disadvantageous in terms of mass and cost. On the other hand, when the worker works on the boom side step 63, for example, a bracket (not shown) provided on the boom 20 can be used as the anchor. Or, even if the anchor is provided at a position away from the boom 20, the anchor can be located at a position close to the boom 20. Therefore, the anchor can be advantageous in terms of mass and cost compared to the case where the worker climbs up to the back surface 20d of the boom 20 to work.

[0041] (Worker posture) When a worker climbs onto the rear surface 20d of the boom 20 and performs work related to the rear surface 20d (for example, work related to the boom-mounted device 40), the worker needs to bend forward. This may cause strain on the worker's lower back. In addition, when the worker leans forward, the worker's head is not positioned directly above the center of gravity of the worker's body, which may result in an unstable posture. On the other hand, when the worker climbs onto the boom side step 63 to perform work, the worker's standing position (foot position) can be lowered compared to when the worker climbs onto the rear surface 20d of the boom 20. In this case, the worker can perform work related to the rear surface 20d while standing on the boom side step 63. This reduces the need for the worker to bend forward. This improves the worker's posture during work, allowing the worker to perform work in a more stable posture. In addition, the strain on the worker's lower back can be reduced.

[0042] Nowadays, workers are getting older, and there is a demand for a greater level of reduction in the burden on workers (improvement of ease of ascending and descending, and stability of the worker's posture while working) than ever before, as well as the ability to work at a lower position. By providing the work machine 1 with the boom side step 63, it is possible to reduce the burden on the worker and to allow the worker to work at a lower position.

[0043] (Effects of the first invention) The effects of the work machine 1 shown in Fig. 2 are as follows. The work machine 1 comprises a machine body 10, a boom 20, a body-side step 61, and a boom lateral step 63. The boom 20 is attached to the machine body 10 so as to be able to be raised and lowered. The body-side step 61 is provided on the machine body 10. The boom lateral step 63 is positioned laterally outward Y2 from the boom 20 (see Fig. 1).

[0044] [Configuration 1] The boom side step 63 is arranged to form a passage together with the body side step 61 when the boom 20 is in the lowered state (see FIG. 1). The boom side step 63 is arranged at least in one of the following positions [Position 1A], [Position 1B], [Position 1C], and [Position 1D]. [Position 1A] A position closer to the ventral surface 20c of the boom 20 than the back surface 20d of the boom 20, and extending parallel to the lower side Z2 surface of the machine body 10 when the boom 20 is in the lowered state. [Position 1B] A position closer to the ventral surface 20c than the back surface 20d, and extending parallel to the back surface 20d. [Position 1C] A position along the ventral surface 20c of the boom 20 when viewed from the lateral direction Y. [Position 1D] A position Z2 below the ventral surface 20c when the boom 20 is in the lowered state (see FIG. 3).

[0045] According to the above [Configuration 1], the boom side step 63 is disposed at a lower position when the boom 20 is in the collapsed state, compared to the case where the work scaffold is disposed on the back surface 20d of the boom 20. Therefore, the work scaffold (specifically, the boom side step 63) when the boom 20 is in the collapsed state can be lowered than before. As a result of being able to lower the work scaffold (the boom side step 63), it is possible to suppress the need for the worker to be in a slouched position when performing work on the surface (back surface 20d) of the upper side Z1 of the boom 20. As a result, it may be possible to suppress the burden on the worker's lower back, and it may be possible to make the worker's posture during work a stable posture. In addition, as a result of being able to lower the work scaffold (the boom side step 63), it is possible to shorten the moving distance in the vertical direction Z between the work scaffold (the boom side step 63) and the ground G.

[0046] When the boom side step 63 is disposed in the above-mentioned [Position 1A], the boom side step 63 is disposed so as to extend parallel (including approximately parallel) to the surface of the lower side Z2 of the machine body 10 when the boom 20 is in the lowered state. As a result, the boom side step 63 is disposed so as to extend in the horizontal direction or approximately horizontal direction. Therefore, the worker can perform work in a stable posture compared to when the boom side step 63 is greatly inclined relative to the horizontal direction.

[0047] When the boom side step 63 is disposed in the above-mentioned [position 1B], the boom side step 63 is disposed so as to extend parallel to the back surface 20d of the boom 20. Therefore, when the boom 20 is in the lowered state and the back surface 20d of the boom 20 is disposed so as to extend horizontally or substantially horizontally parallel, the boom side step 63 is disposed so as to extend horizontally or substantially horizontally. Therefore, the worker can perform work in a stable posture compared to when the boom side step 63 is greatly inclined relative to the horizontal direction.

[0048] When the boom side step 63 is disposed at least in one of the above-mentioned [Position 1C] and [Position 1D], the following effects can be obtained. In this case, the boom side step 63 is disposed at a lower position (lower side Z2 position) when the boom 20 is in the lowered state, compared with the case where the boom side step 63 is disposed only at a position above the ventral surface 20c when the boom 20 is in the lowered state. Therefore, the need for the worker to bend forward when performing work on the back surface 20d of the boom 20 can be further reduced. In addition, since the boom side step 63 can be lowered, the moving distance in the up-down direction Z between the boom side step 63 and the ground G can be further shortened.

[0049] Second embodiment With reference to Figures 3 and 4, the differences between the work machine 201 of the second embodiment and the first embodiment will be described. Note that a description of the common points between the work machine 201 and the first embodiment will be omitted. The same applies to the other embodiments described later, where a description of the common points will be omitted. The main difference is the position of the boom side step 263 shown in Figure 3. Note that the tip side boom 23 and cylinder rod 33 shown in Figure 3 have been omitted in Figure 4.

[0050] In the example shown in Fig. 2, the boom side step 63 is attached to the boom 20. On the other hand, in the example shown in Fig. 3, the boom side step 263 is attached to the boom hoisting cylinder 30. Below, a case will be described in which the longitudinal direction of the boom hoisting cylinder 30 is arranged horizontally or approximately horizontally. In this case, the boom central axis 20a is inclined with respect to the front-to-rear direction X so as to be arranged on the lower side Z2 toward the front side X1 (arranged downward toward the front). The boom 20 in this state is included in the "decumulated state".

[0051] The boom side step 263 is disposed on the lower side Z2 of a portion 20c1 of the ventral surface 20c of the boom 20 that faces the boom hoisting cylinder 30 in the vertical direction Z. As shown in FIG. 4, the boom side step 263 is attached to the cylinder tube 31. For example, the boom side step 263 is attached to the cylinder tube 31 via a mounting bracket 251. As shown in FIG. 3, the boom side step 263 is disposed so as to extend in the same direction as or approximately the same direction as the longitudinal direction of the cylinder tube 31. When viewed from the lateral direction Y, the boom side step 263 may be disposed so as to follow the surface of the lower side Z2 of the cylinder tube 31, for example, so as to overlap with the surface of the lower side Z2 of the cylinder tube 31. When viewed from the lateral direction Y, the boom side step 263 may be disposed so as to follow the central portion of the cylinder tube 31 in the vertical direction Z, or may be disposed so as to follow the surface of the upper side Z1 portion of the cylinder tube 31.

[0052] The position of the rear X2 end of this boom side step 263 in the fore-and-aft direction X may be, for example, near the position of the front X1 end of the main body step 61 in the fore-and-aft direction X, or near the position of the front X1 end of the upper rotating body 13 in the fore-and-aft direction X. The position of the front X1 end of the boom side step 263 in the fore-and-aft direction X may be, for example, near the front X1 end of the boom hoisting cylinder 30. The arrangement of the main body step 61 is set according to the arrangement (e.g., height, etc.) of the boom side step 263. Specifically, in the example shown in FIG. 2, two boom side steps 63 (two stages) are provided, but in the example shown in FIG. 3, only one boom side step 63 (one stage) may be provided.

[0053] (Effects of the second invention) 3, the work machine 201 is equipped with a boom hoisting cylinder 30. The boom hoisting cylinder 30 is attached to the machine body 10 and the boom 20, and raises and lowers the boom 20 relative to the machine body 10.

[0054] [Configuration 2] The boom side step 263 is attached to the boom hoisting cylinder 30.

[0055] According to the above [Configuration 2], when the boom 20 is in the lowered state, the boom side step 263 is disposed on the lower side Z2 of the boom 20 (more specifically, on the lower side Z2 of the portion 20c1 of the ventral surface 20c of the boom 20 that faces the boom 20 in the up-down direction Z). Therefore, compared to the case where the boom side step 263 is disposed at the same height as the ventral surface 20c of the boom 20 as shown in FIG. 2, the boom side step 263 can be disposed at a lower position as shown in FIG. 3. Furthermore, compared to the case where the boom side step 263 is attached to the boom 20, the boom side step 263 can be disposed at a lower position while reducing the size of the member for supporting the boom side step 263 (for example, the mounting bracket 251 shown in FIG. 4). Therefore, the member for supporting the boom side step 263 (for example, the mounting bracket 251) can be advantageous in terms of mass and cost.

[0056] Third embodiment With reference to Figures 5 to 8, differences between the first embodiment and a work machine 301 of the third embodiment will be described. The main difference is that the boom side step 363 shown in Figure 5 is configured to be retractable (see Figures 7 and 8). The lifting device 50 comprises a main body side step 61 (similar to the first embodiment), a mounting bracket 351, and a boom side step 363. Note that the tip end boom 23 and the boom hoisting cylinder 30 are omitted in Figures 7 and 8.

[0057] The mounting bracket 351 is a member that supports the boom side step 363 so that it can be changed between an extended state and a retracted state. For example, as shown in FIG. 7, the mounting bracket 351 is attached to the boom 20. The mounting bracket 351 may be attached to the ventral surface 20c, or may be disposed so as to protrude downward Z2 from the ventral surface 20c. The mounting bracket 351 may be disposed so as not to protrude (not to protrude) laterally outward Y2 from the side surface 20e. More specifically, the position of the lateral outer side Y2 of the mounting bracket 351 in the lateral direction Y may be the same as the position of the side surface 20e in the lateral direction Y, or may be a position on the lateral inner side Y1. The mounting bracket 351 may be attached to the side surface 20e. The mounting bracket 351 may be attached to the boom hoisting cylinder 30 (see FIG. 5). The mounting bracket 351 includes a mounting bracket main body portion 351a, a shaft portion 351b, an extended state fixing portion 351c1, and a stored state fixing portion 351c2.

[0058] The mounting bracket main body 351a is a main body of the mounting bracket 351. The mounting bracket main body 351a is, for example, a plate-shaped member. The shaft 351b is a portion that becomes the rotation axis of the boom side step 263 (details will be described later). For example, the shaft 351b is provided on the mounting bracket main body 351a (the same applies to the extension state fixing portion 351c1 and the storage state fixing portion 351c2). The shaft 351b is a pin hole into which the shaft pin Pb can be inserted. The extension state fixing portion 351c1 is a portion that fixes the boom side step 363 in an extension state. The extension state fixing portion 351c1 is a pin hole into which the fixing pin Pc can be inserted (the same applies to the storage state fixing portion 351c2). The storage state fixing portion 351c2 fixes the boom side step 363 in a storage state. The fixing pin Pc for fixing the boom side step 363 in the extended state and the fixing pin Pc for fixing it in the stored state (see FIG. 8) may or may not be the same.

[0059] The boom side step 363 is configured to be switchable (between two positions), between an extended state and a stored state (see FIG. 8). For example, the boom side step 363 is configured to be switched between the extended state and the stored state by rotating about a central axis (specifically, the shaft pin Pb) extending in the longitudinal direction of the boom 20. The boom side step 363 may be configured to be switched between the extended state and the stored state by an operation other than rotation (for example, sliding, etc.). Below, a case will be described in which the boom side step 363 is switched between the extended state and the stored state by rotating about the shaft pin Pb.

[0060] The extended state is a state (working position) in which an operator can stand and work on the boom side step 363. Specifically, the extended state is a state in which the boom side step 363 is disposed so as to protrude laterally outward Y2 with respect to the boom 20 when viewed from the upper side Z1. The boom side step 363 in the extended state is disposed so as to protrude (extend) from the mounting bracket 351 laterally outward Y2.

[0061] The stored state is a state when the boom side step 363 is not in use, as shown in Fig. 8. For example, the stored state is selected when the work machine 301 shown in Fig. 6 performs normal work (such as crane work) (it is a normal work position). As shown in Fig. 8, the stored state is a state in which the boom side step 363 is located laterally inward Y1 than in the extended state (see Fig. 7). More specifically, the position of the end of the boom side step 363 on the lateral outer side Y2 in the stored state is located laterally inward Y1 than the position of the end of the boom side step 363 on the lateral outer side Y2 in the extended state.

[0062] It is preferable that the boom side step 363 in the stored state does not protrude (does not protrude) laterally outward Y2 from the side surface 20e of the boom 20. More specifically, it is preferable that the position in the lateral direction Y of the end portion of the lateral outer side Y2 of the boom side step 363 in the stored state is disposed at the same position as the position in the lateral direction Y of the side surface 20e of the boom 20, or disposed on the lateral inner side Y1. In this case, the boom side step 363 in the stored state is prevented from interfering with the work of the work machine 301 (see FIG. 6). Note that the boom side step 363 in the stored state may protrude laterally outward Y2 from the side surface 20e. Even in this case, since the boom side step 363 is disposed on the lateral inner side Y1 in the stored state rather than in the extended state, the boom side step 363 in the stored state is prevented from interfering with the work of the work machine 301 (see FIG. 6). As shown in FIG. 7, the boom side step 363 includes a step main body portion 363a, a step side shaft portion 363b, and a step side fixing portion 363c.

[0063] The step body 363a is a part that serves as a foothold for an operator, and is, for example, a plate-shaped part. The step side shaft part 363b is a part that serves as a rotation axis of the boom side step 363 relative to the mounting bracket 351. The step side shaft part 363b is provided on the step body 363a (the same is true for the step side fixing part 363c). For example, the step side shaft part 363b is a pin hole to which the shaft part pin Pb can be attached. The step side fixing part 363c is a part for fixing the boom side step 363 in the extended state and the stored state (see Figs. 7 and 8). For example, the step side fixing part 363c is a pin hole to which the fixing pin Pc can be attached. Note that the step side fixing part 363c for fixing the boom side step 363 in the extended state and the step side fixing part 363c for fixing the boom side step 363 in the stored state may be provided separately.

[0064] (Effects of the third invention) [Configuration 3] The boom side step 363 shown in Fig. 7 is configured to be switchable between an extended state and a stored state (see Fig. 8). The extended state is a state in which the boom side step 363 is disposed so as to protrude laterally outward Y2 with respect to the boom 20 when viewed from the upper side Z1. As shown in Fig. 8, the stored state is a state in which the boom side step 363 is disposed laterally inward Y1 than the extended state.

[0065] With the above [Configuration 3], by putting the boom side step 363 in the stored state, it is possible to prevent the boom side step 363 from interfering with the work of the work machine 301.

[0066] (Effect of the fourth invention) [Configuration 4] In the stored state, the position in the lateral direction Y of the end portion on the lateral outer side Y2 of the boom side step 363 is positioned at the same position as, or on the lateral inner side Y1 relative to the position in the lateral direction Y of the side 20e of the boom 20.

[0067] By setting the boom side step 363 in the stored state according to the above [Configuration 4], the boom side step 363 does not protrude (stick out, protrude) laterally outward Y2 from the side surface 20e of the boom 20. This makes it possible to further prevent the boom side step 363 from interfering with the work of the work machine 301 (see FIG. 6).

[0068] (Effect of the fifth aspect of the invention) [Configuration 5] The boom side step 363 is configured to switch between an extended state and a stored state by rotating around a central axis (e.g., shaft pin Pb) extending in the boom longitudinal direction (longitudinal direction of the boom 20) (see Figures 7 and 8).

[0069] The above [Configuration 5] makes it possible to simplify the configuration for switching the boom side step 363 between the extended state and the stored state, as compared with a case in which the boom side step 363 is configured to slide to switch between the extended state and the stored state. Also, it may be possible to simplify the operation for switching the boom side step 363 between the extended state and the stored state.

[0070] (Fourth embodiment) 9 and 10, a working machine 401 according to the fourth embodiment will be described with reference to the differences from the first embodiment. The difference is the configuration of a main body side step 61 shown in FIG.

[0071] The body side step 61 includes a body side first step 461a and a body side second step 461b. The body side step 61 is arranged so as to branch (have a branching portion 461c) into a passage from the body side first step 461a toward the boom side step 63 and a passage from the body side first step 461a toward the body side second step 461b.

[0072] As shown in Fig. 10, the main body side first step 461a is a portion of the main body side step 61 that is arranged on the lower side Z2 than the boom side step 63. The main body side step 61 shown in Figs. 1 to 3, 5, and 6 corresponds to the main body side first step 461a.

[0073] The main body side second step 461b is disposed on the rear side X2 of the main body side first step 461a as shown in Fig. 9. The main body side second step 461b is disposed on the rear side X2 of the boom side step 63. For example, as shown in Fig. 10, it may be disposed on the upper side Z1 of the main body side first step 461a, and the main body side second step 461b may be disposed on the upper side Z1 of the boom side step 63. As shown in Fig. 9, the rear side X2 end of the main body side second step 461b may be disposed on the rear side X2 of the rear side X2 end of the boom 20.

[0074] In addition, when the main body side step 61 has a first main body side step 461a and a second main body side step 461b, the boom side step 63 (boom side step 263) shown in Figure 10 may be attached to either the boom 20 or the boom hoisting cylinder 30.

[0075] (Effect of the sixth aspect of the invention) [Configuration 6] As shown in Fig. 10, the body-side step 61 includes a body-side first step 461a and a body-side second step 461b. The body-side first step 461a is disposed on the lower side Z2 of the boom side step 63. As shown in Fig. 9, the body-side second step 461b is disposed on the rear side X2 of the body-side first step 461a. The body-side step 61 is disposed so as to branch into a passage from the body-side first step 461a toward the boom side step 63 and a passage from the body-side first step 461a toward the body-side second step 461b.

[0076] According to the above [Configuration 6], the first body step 461a can be shared by the passage from the first body step 461a to the boom side step 63 and the passage from the first body step 461a to the second body step 461b. Therefore, compared to the case where these are not shared, the body step 61 can be made more space-saving, and the cost of the body step 61 can be suppressed.

[0077] Fifth embodiment 11 and 12, a work machine 501 according to the fifth embodiment will be described with respect to differences from the first embodiment. The main difference is the configuration of a boom side step 563 shown in Fig. 11. The boom side step 563 includes a narrow portion 563a and a wide portion 563b.

[0078] The narrow width portion 563a is disposed in a rear-side X2 portion of the boom side step 563. For example, the narrow width portion 563a is provided so as to extend from the rear-side X2 end portion of the boom side step 563 to the front side X1.

[0079] This narrow width portion 563a is disposed with a gap between it and the machine body 10 (more specifically, the upper rotating body 13). That is, the narrow width portion 563a is disposed so as not to interfere with the machine body 10. When the boom side step 563 is retractable (see the boom side step 363 shown in FIG. 6), it is preferable that the boom side step 563 is disposed so as not to interfere with the upper rotating body 13 in any state from the retracted state to the extended state.

[0080] It is preferable that the narrow portion 563a is disposed so that the body-side step 61 and the boom-side step 563 do not overlap when viewed from the upper side Z1. In this case, the operator ascending the body-side step 61 is prevented from interfering with the boom-side step 563 (the narrow portion 563a). For example, the lateral outer Y2 portion of the narrow portion 563a is disposed on the lateral inner side Y1 than the lateral inner side Y1 end of the body-side step 61. For example, when the body-side second step 461b (see FIG. 9) is provided, the lateral outer Y2 end of the narrow portion 563a is disposed on the lateral inner side Y1 than the lateral inner side Y1 of the body-side first step 461a (see FIG. 9). For example, the front side X1 end of the narrow portion 563a is disposed on the front side X1 than the front side X1 end of the body-side step 61. For example, the front X1 end of the narrow width portion 563a is disposed on the front X1 side further forward than the front X1 end of the front portion 13c of the upper rotating body 13 on the side opposite to the driver's cab.

[0081] The wide portion 563b is disposed on the front side X1 of the narrow portion 563a. The width of the wide portion 563b in the lateral direction Y is wider than the width of the narrow portion 563a in the lateral direction Y. The position of the lateral outer Y2 portion of the wide portion 563b in the lateral direction Y is disposed on the lateral outer side Y2 of the lateral outer side Y2 portion of the narrow portion 563a. For example, the lateral outer side Y2 portion of the wide portion 563b is disposed on the lateral outer side Y2 of the lateral inner side Y1 end of the main body side step 61 (main body side first step 461a). For example, the lateral outer side Y2 portion of the wide portion 563b may be disposed on the lateral inner side Y1 or on the lateral outer side Y2 of the main body side step 61 (main body side first step 461a).

[0082] (Effects of the seventh aspect of the invention) As shown in FIG. 11, the boom side step 563 includes a narrow portion 563a and a wide portion 563b.

[0083] [Configuration 7-1] The narrow width portion 563a is arranged in the rear side X2 portion of the boom side step 563, and is arranged with a gap between it and the machine body 10.

[0084] [Configuration 7-2] The wide portion 563b is disposed on the front side X1 of the narrow portion 563a. The width of the wide portion 563b in the lateral direction Y is greater than the width of the narrow portion 563a in the lateral direction Y.

[0085] In the above [Configuration 7-1], the narrow width portion 563a is disposed with a gap between it and the machine body 10. This makes it possible to suppress interference between the boom side step 563 and the machine body 10. In addition, it is possible to suppress interference between the worker ascending the body-side step 61 and the boom side step 563.

[0086] In the above [Configuration 7-2], the width of the wide portion 563b in the lateral direction Y is wider than the width of the narrow portion 563a in the lateral direction Y. Therefore, compared to a case where only the narrow portion 563a is provided on the boom side step 563, the foothold of the worker at the wide portion 563b can be made wider. As a result, the worker can easily perform work.

[0087] (Modification) The above embodiment may be modified in various ways. For example, components of different embodiments may be combined with each other. Specifically, for example, as shown in FIG. 2, a boom side step 63 may be attached to the boom 20, and as shown in FIG. 3, a boom side step 263 may be attached to the boom hoisting cylinder 30. For example, the number of components may be changed, and some of the components may not be provided. For example, the components may be fixed or connected directly or indirectly. For example, what has been described as multiple different members or parts may be treated as one member or part. For example, what has been described as one member or part may be provided as multiple different members or parts. For example, each component may have only a part of each feature (function, arrangement, shape, operation, etc.). [Explanation of symbols]

[0088] 1, 201, 301, 401, 501 Work Machines 10 Machine body 20. Boom 20c ventral surface 20d back 20e Side 30 Boom derrick cylinder 61 Body side step 63, 263, 363, 563 Boom side step 461a Main unit first step 461b Main unit second step 563a Narrow section 563b Wide section Y Horizontal Y1 Lateral inner side Y2 Lateral outer side

Claims

1. A machine body, A boom attached to the machine body in a hoistable manner; A body side step provided on the machine body; A boom side step disposed laterally outward of the boom; Equipped with The boom side step and the main body side step are arranged to be in contact with each other when the boom is in a lowered state. They are also arranged to form an aisle. The boom side step includes: The boom is located on the ventral side of the boom from the rear side of the boom and on the front side of the boom when the boom is in a lowered state. A position extending parallel to the lower surface of the machine body; A position extending toward the ventral surface side from the back surface and parallel to the back surface; A position along the ventral surface when viewed from the lateral direction; a position below the ventral surface when the boom is in a lowered state; and A device is attached to the machine body and the boom, and the device raises the boom relative to the machine body. A boom hoisting cylinder is provided to lower the boom. The boom side step is attached to the boom hoisting cylinder. Working machinery.

2. A machine body, A boom attached to the machine body in a hoistable manner; A body side step provided on the machine body; A boom side step disposed laterally outward of the boom; Equipped with The boom side step and the main body side step are arranged to be in contact with each other when the boom is in a lowered state. They are also arranged to form an aisle. The boom side step includes: The boom is located on the ventral side of the boom from the rear side of the boom and on the front side of the boom when the boom is in a lowered state. A position extending parallel to the lower surface of the machine body; A position extending toward the ventral surface side from the back surface and parallel to the back surface; A position along the ventral surface when viewed from the lateral direction; a position below the ventral surface when the boom is in a lowered state; and The boom side step is configured to be switchable between an extended state and a stored state, The extended state is a state in which the boom side step is disposed so as to protrude laterally outward relative to the boom when viewed from above, The stored state is a state in which the boom side step is disposed laterally inward relative to the extended state, The lateral position of the laterally outer end of the boom side step in the stored state is disposed at the same position or laterally inward relative to the lateral position of the side of the boom. Working machinery.

3. A work machine as claimed in claim 2, The boom side step rotates around a central axis extending in the boom longitudinal direction, configured to switch between the extended state and the stored state; Working machinery.

4. A work machine according to any one of claims 1 to 3, The body side step includes: A main body side first step arranged below the boom side step; a main body side second step arranged rearward of the main body side first step; Equipped with The body side step extends from the body side first step toward the boom side step. and a passage leading from the first step to the second step. The system is arranged so that Working machinery.

5. A work machine according to any one of claims 1 to 4, The boom side step includes: The boom side step is disposed at a rear portion of the boom side step and is spaced apart from the machine body. The narrow portion is placed A wide portion disposed forward of the narrow portion; Equipped with The width of the wide portion in the lateral direction is wider than the width of the narrow portion in the lateral direction. Working machinery.

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