Ascending / descending device of construction machine and construction machine

Abstract

To provide an ascending / descending device of a construction machine and a construction machine that are superior in storage performance of an ascending / descending device in a vehicle, and that allow suitable access to an upper structure.SOLUTION: An ascending / descending device of a construction machine comprises: a main body part 22 which is provided in an upper structure (a floor part 11) of a construction machine (a crawler carrier) including the upper structure on a traveling body 3, and which on one hand holds a deployment state of extending downward from the upper structure when in use to allow a user to ascend / descend, and which on the other hand holds a storage state of being stored in the upper structure during storage; and in addition, a sheath part 21 for housing the main body part 22 in the upper structure (the floor part 11).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a lifting device provided in a construction machine for access to an upper structure, and to a construction machine to which the lifting device is applied. [Background technology]

[0002] Generally, construction machinery such as crawler carriers and mobile cranes, which are equipped with a vehicle body frame and cab on a running body such as a crawler, as well as equipment such as an engine and hydraulic oil, are larger than passenger cars, etc., and in order to access the cab and other equipment provided on the upper structure, it is necessary to ascend and descend at least the height of the running body or a height equivalent thereto (In this specification, the vehicle body provided on the upper body of a construction machinery, and structures such as equipment attached thereto, will be collectively referred to as the "upper structure"). Therefore, in this type of construction machinery, a ladder-like or staircase-like lifting device may be attached to the upper structure, as in Patent Documents 1 and 2 listed below, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-60868 [Patent Document 2] Japanese Patent Publication No. 2022-165861 Summary of the Invention [Problem to be solved by the invention]

[0004] The lifting devices described in Patent Documents 1 and 2 are installed primarily to assist in entering and exiting the cab. However, in construction machinery, access to the upper structure is often required for purposes other than entering and exiting the cab. For example, it is necessary to climb up to the upper structure to perform various tasks, such as refueling, inspecting and maintaining the engine and other machinery, changing or replenishing hydraulic oil, and replenishing urea water to be supplied to the exhaust purification system. This is because, in construction machinery such as the above, equipment such as a fuel tank, engine, and hydraulic oil tank are also attached to the upper structure.

[0005] Lifting devices designed for accessing the driver's cab are not necessarily suitable for accessing these facilities and equipment. Equipment such as the engine and fuel tank are usually located outside the driver's cab, while the door to the driver's cab is located on the outside in the left-right direction of the vehicle, i.e., on the opposite side of the equipment. Therefore, it is not possible to access the side where the equipment is located from a lifting device located on the driver's cab door side.

[0006] Of course, it is possible to install a similar lifting device in a portion of the superstructure other than the cab. However, because the positional requirements of the cab and other portions of the vehicle are different, it is not necessarily appropriate to simply install a device similar to that installed in the cab in other portions. The cab is often installed at the very front of the vehicle in construction machinery, and the floor of the cab is often set at a height close to the lowest part of the superstructure. Therefore, a lifting device for accessing the cab is less likely to interfere with the running body. When the cab is installed in a shape that protrudes from the very front of the vehicle, at least a portion of the cab is farther from the center of rotation than the front end of the running body, and installing a lifting device in that position avoids interference with the running body. In addition, the height required for accessing the cab is also short. Therefore, when considering access to the cab, a small ladder-shaped lifting device attached to the lower front part of the cab is sufficient, although this will vary depending on the actual vehicle configuration.

[0007] On the other hand, when considering access to areas other than the cab, first, the equipment other than the cab installed on the upper structure is often located closer to the rotation center than the cab, i.e., closer to the running structure. Furthermore, the height difference required for ascent and descent is large. For example, when accessing the upper structure for engine maintenance, it is necessary to climb to the top of the equipment housing mounted on the frame. In other words, a lifting device with a height sufficient to access the cab is insufficient; a lifting device with a larger height dimension is required. If such a large lifting device is installed in a position on the upper structure other than the cab and protrudes downward from the frame height, it is likely to interfere with the running structure. Even if it is possible to install the lifting device in a position that does not interfere with the running structure, it may interfere with the movement and operation of the vehicle depending on the condition of objects and structures around the vehicle. On the other hand, if the dimensions are too small, the function of accessing and descending to the upper structure may be insufficient.

[0008] Therefore, when it is necessary to access a part of the upper structure other than the driver's cab, instead of providing a lifting device, methods such as bringing in and setting up a stepladder from outside, or (only in the case of a swivel-type vehicle in which the upper structure is swivelable relative to the running body) rotating the upper structure at an oblique angle relative to the running body, which is a crawler, and using the crawler as a foothold to climb up to the upper structure have often been used. However, these methods require the steps of transporting and setting up a stepladder and rotating the upper structure every time access to the upper structure is required, which is cumbersome.

[0009] Furthermore, for example, Patent Document 2 above describes a boarding staircase that is installed in a location other than the driver's cab and that can be stored in the upper structure by rotating on an axis. However, this boarding staircase requires the steps to be removed in order to store it in the upper structure, and it is not designed to allow access to high positions in the upper structure by itself (an access route must be provided in the upper structure in addition to the boarding staircase), so it cannot be said to completely solve the problems mentioned above.

[0010] In view of the above circumstances, the present invention aims to provide a lifting device for a construction machine, and a construction machine, which has excellent storage capacity for the lifting device in a vehicle and allows convenient access to the upper structure. [Means for solving the problem]

[0011] The present invention relates to a lifting device for a construction machine, which is provided on the upper structure of a construction machine that has an upper structure above a running body, and is characterized by having a main body that, when in use, extends below the upper structure and assumes an unfolded state that allows the user to climb up and down, and, when stored, assumes a stored state that is housed in the upper structure.

[0012] The lifting device for a construction machine of the present invention can be configured to include a sheath portion that houses the main body portion within the upper structure.

[0013] In the lifting device for a construction machine of the present invention, the main body can be configured so that, in the unfolded state, it is held at an angle extending obliquely downward and forward from the upper structure.

[0014] The present invention also relates to a construction machine characterized in that the above-mentioned lifting device for a construction machine is provided on the upper structure. [Effects of the Invention]

[0015] The lifting device for a construction machine and the construction machine of the present invention can provide the excellent effects of allowing the lifting device to be easily stored in the vehicle and providing convenient access to the upper structure. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing an example of a configuration of a construction machine (crawler carrier) to which the present invention is applied, showing a stored state in which the main body of the lifting device is housed in the upper structure. [Figure 2] 2 is a perspective view showing the crawler carrier of FIG. 1 with the main body of the lifting device unfolded. FIG. [Figure 3] 3 is a plan view showing a storage state in which the main body of the lifting device provided in the crawler carrier of FIGS. 1 and 2 is housed. FIG. [Figure 4] FIG. 4 is a front view of the lifting device of FIG. 3. [Figure 5] 4 is a front cross-sectional view of the lifting device of FIG. 3 (a view corresponding to the VV arrow in FIG. 3), and a front cross-sectional view showing a main part thereof in an enlarged scale. [Figure 6] FIG. 6 is a perspective view showing the lifting device of FIGS. 3 to 5 in an unfolded state. [Figure 7] 7 is a perspective view of the lifting device in the state of FIG. 6 as seen from a different angle, and a perspective view showing a main part thereof in an enlarged scale. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0018] 1 to 7 show an example of a construction machine according to the present invention and a lifting device installed thereon, and in this example, a swivel-type crawler carrier is assumed as the construction machine. The crawler carrier 1 has a running body 3, which is a crawler, attached to the bottom of a vehicle body 2, and a frame 4 that constitutes the vehicle body 2 is attached so as to be able to swing relative to the running body 3 via a swivel base (not shown). A driver's cab 6 is provided on the left side of the front part of the vehicle body 2, and a loading platform 7 is attached behind the driver's cab 6.

[0019] On the opposite side (right side) of the cab 6 in the left-right direction of the vehicle, there are provided equipment such as a fuel tank, a hydraulic oil tank, and an engine (in this specification, the structures and equipment such as the body 2, frame 4, cab 6, loading platform 7, fuel tank, hydraulic oil tank, and engine casing provided on the running body 3 are referred to as the "upper structure"). An elevator 20 is provided at a position corresponding to the front of this upper structure.

[0020] 6 and 7, the lifting device 20 is configured to include a sheath 21 provided inside the upper structure of the vehicle, and a main body 22 housed in the sheath 21 and pulled out from the sheath 21 during use. The main body 22 is configured to be switchable between a stored state housed inside the sheath 21 as shown in FIGS. 3 to 5, and an expanded state pulled forward from the sheath 21 and extending downward from the front of the upper structure as shown in FIGS. 6 and 7.

[0021] The crawler carrier 1 shown here is provided with a floor section 11 that forms a horizontal surface at the lowermost part of the front right side of the upper structure (at a position close to the running body 3 located below). This floor section 11 is a hollow member that forms part of the housing of the upper structure, and functions as a floor on which the user stands when ascending or descending to the upper structure using the lifting device 20. The sheath section 21 is installed inside this floor section 11.

[0022] The front of the floor 11 is provided with a drawer opening 21a, which is an opening for inserting and removing the main body 22 into and from the upper structure, and the sheath 21 is installed so as to extend from this portion into the interior of the floor 11 at the rear. The sheath 21 is equipped with a pair of rails 21b extending in the front-to-rear direction, support members 21c and connecting members 21d for fixing the rails 21b in appropriate positions relative to the floor 11 and the drawer opening 21a, and a bag portion 21e that forms the periphery of the drawer opening 21a, and forms a flat, rectangular parallelepiped-shaped space inside that extends in the front-to-rear direction as a whole. The main body 22 is housed in this internal space and can be pulled out when in use.

[0023] In this specification, directions such as front, rear, left and right are described based on the front, rear, left and right of the upper structure of the vehicle.

[0024] The support members 21c are attached to the upper structure and are structural members for supporting the entire sheath 21 relative to the upper structure. In this embodiment, they are configured as a pair of elongated metal plate-like members that form horizontal surfaces and extend in the front-to-rear direction. The pair of support members 21c are connected at their lower parts by multiple connecting members 21d. The connecting members 21d are elongated metal plate-like members that form horizontal surfaces and extend in the left-to-right direction. The rear ends of the support members 21c extend rearward and are fixed to structural members that form the upper structure of the vehicle.

[0025] Further, a rail portion 21b is attached below each support member 21c. The rail portion 21b is a thin, elongated metal plate-like member having a U-shaped cross section, and a pair of rail portions 21b are provided parallel to each other along the front-rear direction. The rail portion 21b is formed by bending a metal plate so that the cross section perpendicular to the longitudinal direction is U-shaped, and one of the four longitudinal side surfaces is open. The pair of rail portions 21b is supported below the pair of support members 21c with the open side surface facing inward in the left-right direction. In other words, each rail portion 21b has an upper surface portion 21i and a lower surface portion 21j that form horizontal surfaces and protrude inward in the left-right direction from the upper and lower ends of a side surface portion 21h that forms a vertical surface and extends in the front-rear direction.

[0026] A pouch portion 21e is provided in the front portion of the sheath portion 21, forming the front end of the sheath portion 21. The pouch portion 21e is a pouch-shaped member provided so as to surround the front end portion of the rail portion 21b, and is formed as a metal plate-shaped member that forms the top surface, both side surfaces, and front surface at the front portion of the sheath portion 21.

[0027] The front surface of the bag portion 21e constitutes the front surface of the sheath portion 21 and also constitutes the front surface of the floor portion 11. That is, an opening shaped to fit the front surface of the bag portion 21e is formed in the front surface of the floor portion 11, and the sheath portion 21 is attached to this opening with the front surface of the bag portion 21e exposed.

[0028] The withdrawal opening 21a is a horizontally elongated notch provided in the lower part of the front surface of the bag portion 21e, and when the sheath portion 21 is attached to the inside of the floor portion 11, this notch forms the withdrawal opening 21a as a hole that opens in the front surface of the floor portion 11. The main body portion 22 enters and exits through this withdrawal opening 21a. In this embodiment, the bag portion 21e is formed as a member that is continuous with one side of the support member 21c.

[0029] When the sheath portion 21 is viewed from the front with the main body portion 22 housed therein, as shown in Figure 5, the main body portion 22 is exposed at the horizontal withdrawal opening 21a located at the bottom of the front surface of the bag portion 21e, and the main body portion 22 extends from there toward the inside of the floor portion 11 at the rear (the back side of the paper in Figure 5).

[0030] The main body 22 is a ladder-like member comprising a pair of posts 22a extending parallel to each other and steps 22b extending laterally between the posts 22a. Each step 22b is formed as a pair of thin, plate-like members, and the pair of members constituting each step 22b are attached between the pair of posts 22a in a positional relationship in which they are adjacent to each other, with their parallel surfaces and longitudinal directions parallel to each other.

[0031] When housed in the sheath 21 (see FIG. 5), the pair of support posts 22a are housed along the pair of rail portions 21b provided on the sheath 21. That is, the distance between the pair of support posts 22a is set slightly shorter than the distance between the rail portions 21b, and when housed, as shown in FIG. 5, the pair of support posts 22a are fitted inside the pair of rail portions 21b in the left-right direction.

[0032] In the stored state shown in Fig. 5, each plate-like member constituting each step 22b is oriented such that its surface is aligned vertically and its longitudinal direction is aligned horizontally. Furthermore, in the deployed state shown in Figs. 6 and 7, when the main body 22 is pulled out and deployed at an oblique angle relative to the sheath 21, the pair of members constituting each step 22b are attached to the support 22a so that their upper edges are at approximately the same height. The upper edges of the members constituting the step 22b in the deployed state are serrated. Three pairs of step 22b, each consisting of a pair of the aforementioned members, are provided in the extension direction of the support 22a of the main body 22. One step 22b is located at the tip of the support 22a (the front end in the stored state; the lower end in the deployed state), and the remaining two step 22b are located in the middle of the support 22a.

[0033] In this specification, expressions such as "along the vertical direction," "along the vertical direction," "along the horizontal direction," and "along the horizontal direction" do not only refer to an exact coincidence with the vertical or horizontal direction, but also refer to an angle that can be considered to be roughly vertical or horizontal, or vertical or horizontal, in practical terms.

[0034] Two bearings 22c are provided at the rear ends (upper ends in the deployed state) of the pair of support columns 22a, one on each side in the left-right direction. These bearings 22c are configured to rotate around a rotation axis extending in the left-right direction. When the main body 22 is housed in the sheath 21, each bearing 22c is housed so as to rest on the upper surface of the lower surface 21j of the rail 21b. When the main body 22 is inserted into or removed from the sheath 21, each bearing 22c rotates while contacting the upper surface of the lower surface 21j of the rail 21b, thereby ensuring smooth movement of the main body 22. The diameter of the rotating portion of each bearing 22c is set smaller than the distance between the lower surface of the upper surface 21i of the rail 21b and the upper surface of the lower surface 21j. When the bearing 22c is housed on the upper surface of the lower surface 21j, the upper surface 21i is positioned above and spaced apart from the bearing 22c.

[0035] Meanwhile, a bearing portion 21f is also provided at the front portion of the sheath portion 21 so as to protrude inward in the left-right direction. The pouch portion 21e constituting the front portion of the sheath portion 21 covers the front portion of the pair of rail portions 21b on its upper surface, front surface, and both side surfaces. However, of the three surfaces (side surface portion 21h, upper surface portion 21i, and lower surface portion 21j) extending along the longitudinal direction of the rail portions 21b, the front end of the lower surface portion 21j does not reach the front surface of the pouch portion 21e. In other words, there is a portion at the front end of the rail portions 21b where the lower surface portion 21j is not provided, and in that portion, the side surface portion 21h extends downward beyond the lower surface portion 21j. A pair of bearing portions 21f is provided in that portion (a portion of the side surface portion 21h that is forward of the front end of the lower surface portion 21j and below the lower surface portion 21j).

[0036] Each bearing 21f is a bearing configured to rotate about a rotation axis extending in the left-right direction, and as described above, is provided in a position further forward of the front end of the lower surface 21j of the rail portion 21b and below the lower surface 21j. When the main body 22 is inserted into or removed from the sheath 21, the bearing 22c on the main body 22 side rests on the lower surface 21j of the rail portion 21b, and the support 22a of the main body 22 rests on the bearing 21f on the rail portion 21b side, and the bearing 21f rotates in this state, allowing the main body 22 to be inserted or removed smoothly.

[0037] A hook 22d serving as an engagement part is provided at the rear end of the support 22a constituting the main body 22 when stored, so as to protrude downward when stored. This hook 22d protrudes downward from the rear end of the support 22a when stored, and its tip is bent forward. When the main body 22 is pulled out from the sheath 21, this hook 22d catches on the axis of the bearing 21f provided in the front bag 21e, thereby preventing the main body 22 from being pulled out further from the sheath 21 (see FIG. 7).

[0038] Furthermore, a hook 22e serving as an engaging portion is provided at a portion of the support 22a that corresponds to the front end during storage, so as to protrude downward during storage. This hook 22e protrudes downward from the front end of the support 22a during storage, with its tip bent rearward. Meanwhile, on both left and right sides of the lower part of the withdrawal opening 21a in the bag portion 21e, members (engaging portions) (not shown) that engage with the hooks 22e when the main body portion 22 is withdrawn are provided so as to protrude inward in the left-right direction from both side surfaces of the bag portion 21e, and these engage with the hooks 22e on the main body portion 22 when the main body portion 22 is housed in the sheath portion 21.

[0039] In this way, in the lifting device 20, when the main body 22 is pulled out, the bearing portion 21f acts as an engaging portion on the sheath 21 side that engages with the hook 22d, which is the engaging portion at the rear end of the main body 22, and when the main body 22 is stored, the above-mentioned member (not shown) acts as an engaging portion on the sheath 21 side that engages with the hook 22e, which is the engaging portion at the front end of the main body 22.

[0040] A stopper portion 22f is provided at the rear end of the main body 22 so as to form a surface extending obliquely rearward from the upper surface of the rear end. This stopper portion 22f functions to prevent the main body 22 from rotating when the main body 22 is pulled out.

[0041] When the main body 22 is pulled out, the hook 22d at its rear end engages with the bearing 21f. Subsequently, the entire main body 22 rotates around the bearing 21f in a direction that lowers the front end. Here, with the bearing 22c of the main body 22 resting on the lower surface 21j of the rail 21b, the upper surface 21i of the rail 21b is positioned above the bearing 22c. The bearing 22c of the main body 22 is provided at the rear end of the pair of support columns 22a, and its position is more rearward than the position where the hook 22d is provided. Therefore, with the hook 22d engaged with the bearing 21f of the sheath 21, the main body 22 rotates around the bearing 21f, and the front end of the main body 22 moves downward. At the same time, the rear end of the main body 22 moves upward. The rear end portion is provided with the stopper portion 22f, which is raised as the main body portion 22 rotates and comes into contact with the inner wall surface of the bag portion 21e, thereby stopping the rotation of the main body portion 22. The position at which this rotation stops is a position at which the main body portion 22 extends downward and forward at an oblique angle with respect to the floor portion 11 (see FIGS. 2, 6, and 7). That is, in the lifting device 20, when the main body portion 22 is pulled out, a part of the bag portion 21e constituting the sheath portion 21, together with the stopper portion 22f provided on the main body portion 22 side, functions as a stopper portion that holds the main body portion 22 at an appropriate angle.

[0042] Step bars 21k are provided above the drawer opening 21a on the front surface of the pouch portion 21e. Similar to step bars 22b provided on the main body portion 22, these step bars 21k are configured as a pair of thin plate-like members. The two plate-like members are connected so that they are close to each other and form parallel surfaces, and are attached along the front surface of the pouch portion 21e with their longitudinal directions aligned with the left-right direction. The upper edge of each plate-like member is formed with a sawtooth shape.

[0043] 3 to 5, when the lifting device 20 is used with the main body 22 housed in the sheath 21, the front end of the main body 22 exposed at the draw-out opening 21a on the front surface of the floor 11 is grasped, and the main body 22 is pulled forward from the sheath 21. At this time, the bearing 22c provided at the rear end of the support 22a of the main body 22 rests on the lower surface 21j of the rail 21b of the sheath 21, and the support 22a of the main body 22 rests on the bearing 21f provided on the rail 21b of the sheath 21. The main body 22 is supported by the sheath 21 at these four points in total, and is smoothly pulled forward along the rail 21b due to the rotation of the bearings 22c and 21f.

[0044] When main body 22 is fully pulled out, hook 22d provided at the rear end of support 22a engages with bearing 21f of sheath 21, so the user stops the pulling operation here and lowers the front end of main body 22. Main body 22 rotates around bearing 21f, but when stopper 22f abuts against bag 21e, these function as a stopper to stop the rotation of main body 22, and main body 22 extends diagonally downward and forward relative to floor 11 (for the user attempting to climb onto the upper structure), and is maintained in an unfolded state that allows the user to ascend and descend (see Figures 2, 6, and 7).

[0045] When storing the lifting device 20, the tip of the main body 22 is lifted so that the support 22a is oriented horizontally, and the main body 22 is inserted from the draw-out opening 21a along the rail 21b into the inside of the sheath 21. At this time, with the bearing 22c of the main body 22 resting on the underside 21j of the sheath 21 and the support 22a of the main body 22 resting on the bearing 21f of the sheath 21, the main body 22 is held at four points and smoothly inserted along the rail 21b by the rotation of the bearings 22c and 21f.

[0046] When the front end of the main body 22 is inserted into the sheath 21, the hook 22e provided at the bottom of the tip of the main body 22 engages with an engaging portion (not shown) provided at the bottom of the bag 21e, and the storing operation is completed. In this way, the lifting device 20 of this embodiment is configured to include the main body 22 and the sheath 21 that stores it, so that the main body 22 can be conveniently taken in and out of the upper structure and stored therein.

[0047] 2, 6, and 7, the tip (lower end, i.e., front end) of main body 22 extends below floor 11 of the upper structure, and step 21k of bag 21e is located slightly above the upper end (rear end). Using step 22b, 21k of main body 22 and bag 21e as footholds, a user can use lifting device 20 to conveniently access floor 11 from the front of vehicle body 2, and further to other positions on the upper structure.

[0048] As described above, each step 22b, 21k is composed of a pair of elongated plate-like members, and the pair of members constituting each step 22b, 21k are set so that the height of the upper edges of the pair of members constituting each step 22b, 21k is the same in the unfolded state shown in Figures 6 and 7. Furthermore, because the upper edges are formed with sawtooth shapes, when using the steps 22b, 21k to climb up and down, weight is distributed over the pair of members constituting each step 22b, 21k, and the sawtooth shapes act as a non-slip surface, making it possible to climb up and down comfortably.

[0049] In addition, in the unfolded state, the main body 22 protrudes diagonally forward from the floor 11, forming an angle suitable for ascending and descending, making it easy to ascend. In addition, because the main body 22 protrudes downward from the upper structure at such an angle, it is less likely to interfere with the running body 3 located below the upper structure.

[0050] In particular, in the crawler carrier 1 of this embodiment, as shown in FIG. 1 , the front portion of the vehicle body 2 other than the portion where the cab 6 is located (the portion where the fuel tank and floor 11 are located) is located rearward of the portion where the cab 6 is located, i.e., closer to the center of rotation, and the lifting device 20 installed there is also located rearward by that amount. With a vehicle and lifting device arrangement such as this, if the lifting device protrudes downward from the upper structure in the deployed state, it is likely that the lifting device will interfere with the running body located below. Therefore, in this embodiment, the main body 22 of the lifting device 20, which protrudes downward from the floor 11, is provided with a stopper portion 22f on the main body 22 and a bag portion 21e as a stopper portion on the sheath 21, so that the lifting device 20 is held at the above-mentioned oblique angle in the deployed state. This configuration makes it less likely for the lifting device 20 to come into contact with the running body 3 in the deployed state, even if the installation position of the lifting device 20 on the upper structure is close to the center of rotation. In particular, in the case of this embodiment, even when the lifting device 20 remains deployed, the upper structure can be rotated without the lifting device 20 interfering with the running body 3. Depending on the conditions around the vehicle, it may be necessary to rotate the upper structure to adjust the angle to make it easier to ascend and descend when using the lifting device 20 to access the upper structure, but in this case, the present embodiment does not require the effort of, for example, storing the lifting device 20 once deployed to avoid interference with the running body 3, and then deploying the lifting device 20 again after the rotation operation.

[0051] On the other hand, the lifting device 20 can also be housed in the upper structure in the stowed state shown in Figures 1 and 3 to 5. Apart from interference with the running body 3, depending on the circumstances around the vehicle, it is conceivable that the deployed lifting device 20 may interfere with surrounding objects or structures as the upper structure rotates. In such a case, if the lifting device 20 is in the stowed state, the main body 22 will not protrude outward. In this way, the lifting device 20 of this embodiment makes it easier to lift and lower the device by protruding the main body 22 forward when in use and can avoid interference with the running body 3. However, when the lifting device 20 is not in use or when it is desired to reduce the turning radius in the area where the lifting device 20 is installed, the main body 22 can be simply stowed, thereby achieving both storability in the vehicle and accessibility to the upper structure.

[0052] As described above, the lifting device 20 of the construction machine of the above embodiment is provided on the upper structure (floor 11) of the construction machine (crawler carrier) 1 which has an upper structure on the running body 3, and is configured with a main body 22 which, when in use, extends below the upper structure and assumes an unfolded state that allows the user to ascend and descend, and when stored, assumes a stored state housed in the upper structure. In this way, when the lifting device 20 is used, the main body 22 is unfolded to enable ascending and descending to the upper structure by the lifting device 20, and when the lifting device 20 is not in use, the main body 22 is stowed, thereby achieving both storability in the vehicle and accessibility to the upper structure.

[0053] The lifting device 20 of the construction machine of this embodiment is provided with a sheath 21 that houses the main body 22 inside the upper structure (floor 11). In this way, the main body 22 can be conveniently taken in and out of the upper structure and stored in it.

[0054] In the construction machine lifting device 20 of the present invention, the main body 22 is configured to be held at an angle that extends obliquely downward from the upper structure when deployed. This allows the main body 22 to be at a suitable angle for lifting, making it easier to lift and lower, and also making it less likely for the main body 22 to interfere with the running body 3 located below.

[0055] Furthermore, the construction machine (crawler carrier) 1 of the above embodiment is provided with the above-mentioned lifting device 20 in the upper structure, and therefore can obtain the same effects as those described above.

[0056] Therefore, according to the present embodiment, the lifting device is easy to store in the vehicle and allows convenient access to the upper structure.

[0057] The lifting device for a construction machine and the construction machine of the present invention are not limited to the above-described embodiment. For example, in the above embodiment, a swivel-type crawler carrier is used as an example of a transport vehicle, but the present invention is not limited to this and can be applied to various types of vehicles as long as they are construction machines equipped with a running body and an upper structure. Of course, various modifications can be made to the present invention without departing from the scope of the present invention. [Explanation of symbols]

[0058] 1 Construction machinery (crawler carrier) 3. Running body 11 Superstructure (floor) 20 Lifting device 21 Scabbard part 22 Main body

Claims

1. The construction machine is provided with an upper structure on a traveling body, and the upper structure is provided with the upper structure, When in use, the upper structure extends downward to assume an unfolded state that allows the user to climb up and down. The structure is configured to include a main body that is housed in the upper structure and assumes a stored state when stored. A lifting device for construction machinery characterized by the above.

2. A sheath portion that houses the main body portion is provided within the upper structure.

2. The lifting device for a construction machine according to claim 1,

3. The main body is configured to be held at an angle extending obliquely downward from the upper structure in the deployed state.

2. The lifting device for a construction machine according to claim 1,

4. The lifting device for a construction machine according to claim 1 is provided on the upper structure. Construction machinery characterized by:

Images