Maintenance cart

Abstract

To provide a maintenance cart capable of being readily attached to or detached from an enclosure even when the enclosure is large and heavy.SOLUTION: A maintenance cart 1 retains an enclosure having a grip part on an external surface, and includes a cart base 2 having casters 21, a frame 3 extending upward from the cart base 2, and a support arm 4 that extends in a first direction, which intersects a direction in which the frame 3 extends, from the frame 3 at a position away above from the cart base 2, and supports the grip part from below.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a maintenance cart. [Background technology]

[0002] Patent Document 1 discloses an apparatus (storage-type water heater) that houses various devices inside a housing that opens to the side. In the apparatus of Patent Document 1, a lid that covers the opening that opens to the side is removably attached to the opening. The lid is removed from the housing, for example, when performing maintenance on the various devices inside the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-62960 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the size of the device as in Patent Document 1 is large, the lid attached to the housing is also large and heavy. However, a large and heavy lid is difficult to attach and detach from the housing. For example, even if a gripping part (handle) that an operator can grasp with his or her hand is attached to the outer surface of a large and heavy lid, it is difficult for the operator to support the lid with his or her own strength. In addition, when an operator grasps a large and heavy lid, there is a possibility that the lid may be dropped, which is not preferable.

[0005] In view of the above-mentioned problems, an object of the present invention is to provide a maintenance cart that can easily attach and detach even a large and heavy lid to and from a housing. [Means for solving the problem]

[0006] One aspect of the present invention is a maintenance cart that holds a lid body having a gripping portion on its outer surface, the maintenance cart comprising: a cart base with casters, a frame extending upward from the cart base, and a support arm extending from the frame in a first direction intersecting the direction in which the frame extends at a position spaced above the cart base, and supporting the gripping portion from below. Effect of the Invention

[0007] According to the present invention, it is possible to provide a maintenance cart that can easily attach and detach even a large and heavy lid to a housing. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a maintenance cart according to an embodiment of the present invention. [Diagram 2] 1 is a side view showing a schematic view of a maintenance cart according to an embodiment of the present invention. [Diagram 3] 3 is a diagram for explaining a procedure for removing the cover from the housing using the maintenance cart in FIGS. 1 and 2. FIG. [Figure 4] 3 is a diagram for explaining a procedure for removing the cover from the housing using the maintenance cart in FIGS. 1 and 2. FIG. [Diagram 5] 3 is a diagram for explaining a procedure for removing the cover from the housing using the maintenance cart in FIGS. 1 and 2. FIG. [Figure 6] 1 is a table showing evaluations of the maintenance carts of Examples 1 to 3 and the Comparative Example in terms of the time required for removing and attaching the lid, the ease of removing and attaching the lid, safety, and ease of management. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. As shown in Figs. 3 to 5, the maintenance cart 1 of this embodiment holds a lid 110 that closes an opening 101 of the housing 100 that opens to the side, mainly in a state where it is detached from the housing 100. The lid 110 has a grip portion 111 provided on an outer surface 110a. The grip portion 111 protrudes from the outer surface 110a of the housing 100 and is a portion that can be grasped by hand when an operator holds the lid 110. The grip portion 111 of this embodiment has a portion that extends in a substantially horizontal direction (Y-axis direction in Figs. 3 to 5) along the outer surface 110a of the lid 110 in a state where the lid 110 is attached to the housing 100. In this embodiment, legs 102 are provided at the bottom end of the housing 100. Therefore, the housing 100 is placed by the legs 102 at a predetermined distance above (on the positive Z-axis direction side) a reference plane G such as the ground or a floor.

[0010] As shown in FIGS. 1 and 2, the maintenance cart 1 includes a cart base 2, a frame 3, a support arm 4, a lower arm 5, and an operating handle 6.

[0011] The cart base 2 has a plurality of casters 21 on its underside. The cart base 2 illustrated in FIG. 1 is a rectangular ring-shaped frame, but is not limited to this. The cart base 2 may be formed in any shape, such as a plate shape. The plurality of casters 21 need only be arranged so that at least the cart base 2 can be stably placed on the reference plane G (see FIG. 3, etc.). In FIG. 1, the casters 21 are arranged two by two in the width direction (Y-axis direction) and the front-rear direction (X-axis direction) of the cart base 2.

[0012] In this embodiment, the dimension H1 (height dimension H1) of the cart base 2 including the casters 21 in the height direction (Z-axis direction) is smaller than the height dimension H2 (see FIG. 3) of the legs 102. Therefore, the cart base 2 can be inserted between the reference plane G and the housing 100. The height dimension H1 of the cart base 2 may be, for example, 20 cm or less. In this embodiment, the width direction, front-rear direction, and height direction are perpendicular to one another.

[0013] The frame 3 extends upward from the dolly base 2. In this embodiment, the frame 3 extends without inclining with respect to the vertical direction (Z-axis direction). Note that the frame 3 may extend in a direction inclined with respect to the vertical direction, for example. The frame 3 of this embodiment has a plurality of pillars 30 extending upward from the cart base 2. The plurality of pillars 30 are arranged at intervals in the width direction. The number of pillars 30 may be any number. In this embodiment, the number of pillars 30 is four. In the following description, the two pillars 30 located on the inside of the frame 3 in the width direction may be referred to as first pillars 31. Furthermore, the two pillars 30 located on the outside (both ends) of the frame 3 in the width direction may be referred to as second pillars 32.

[0014] The support arm 4 supports the gripping portion 111 of the cover 110 from below (see Figs. 3 to 5). The support arm 4 extends from the frame 3 at a position spaced above the cart base 2 in a direction (first direction) intersecting the direction in which the frame 3 extends (positive direction of the Z axis). The direction in which the support arm 4 extends from the frame 3 is the forward direction (positive direction of the X axis). In this embodiment, the support arm 4 extends without inclining in the width direction (Y axis direction) or up-down direction (Z axis direction) with respect to the forward direction. Note that the support arm 4 may extend in a direction inclined with respect to the forward direction, for example.

[0015] An upwardly protruding protrusion 41 is provided at the tip of the support arm 4. The height of the protrusion 41 is preferably at least half the height of the gripping part 111 placed on the support arm 4, and more preferably at least the height of the gripping part 111.

[0016] Although not shown, in this embodiment, the length L4 of the support arm 4 in the front-rear direction (X-axis direction) is adjustable. The support arm 4 may be configured, for example, by connecting two members so that they can slide relatively in the front-rear direction. The support arm 4 can be fixed at a predetermined length.

[0017] The support arm 4 is movable in the up-down direction relative to the frame 3. In this embodiment, the support arm 4 is attached to a first support pillar 31 of the frame 3 that extends in the up-down direction. This allows the support arm 4 to move in the up-down direction along the first support pillar 31. The support arm 4 can be fixed to the first support pillar 31 at a predetermined height position. Note that the support arm 4 may be attached to, for example, the second support pillar 32.

[0018] The maintenance cart 1 of this embodiment has a plurality of support arms 4. The number of support arms 4 may be any number. In this embodiment, the number of support arms 4 is two. The two support arms 4 are aligned in the width direction. In this embodiment, the two support arms 4 are independent of each other, and therefore each can move in the vertical direction. Note that the two support arms 4 may be connected, for example. In this case, the two support arms 4 can be moved in the vertical direction while maintaining the relative height positions of the two support arms 4.

[0019] The above-mentioned cart base 2 protrudes forward from the tip of the above-mentioned support arm 4. In addition, a caster 21 is located at the tip of the cart base 2 located forward from the tip of the support arm 4.

[0020] The lower arm 5 supports a portion of the outer surface 110a of the cover 110 below the grip portion 111 (see FIG. 5). The lower arm 5 extends in a forward direction (first direction) from the frame 3 between the cart base 2 and the support arm 4 in the vertical direction. In this embodiment, the lower arm 5 extends without inclining in the width direction or vertical direction with respect to the forward direction. Note that the lower arm 5 may extend in a direction inclined with respect to the forward direction, for example. The lower arm 5 is positioned below (in the negative Z-axis direction) the support arm 4 with a gap therebetween. A height position H5 of the lower arm 5 based on the carriage base 2 is preferably, for example, 80% or less of a height position H4 of the support arm 4.

[0021] A cushioning material 51 for protecting the outer surface 110a of the cover 110 is provided at the tip of the lower arm 5 with which the outer surface 110a of the cover 110 comes into contact. The cushioning material 51 is preferably made of an elastically deformable material such as rubber.

[0022] Although not shown, in this embodiment, the length L5 of the lower arm 5 in the front-rear direction is adjustable. The lower arm 5 may be configured, for example, by connecting two members so that they can slide relatively in the front-rear direction. The lower arm 5 can be fixed at a predetermined length.

[0023] A length L5 of the lower arm 5 in the front-rear direction (X-axis direction) based on the position of the frame 3 is shorter than a length L4 of the support arm 4. That is, the tip of the support arm 4 is located further forward than the tip of the lower arm 5.

[0024] The lower arm 5 is movable in the up-down direction relative to the frame 3. In this embodiment, the lower arm 5 is attached to a first support pillar 31 of the frame 3 extending in the up-down direction. This allows the lower arm 5 to move in the up-down direction along the first support pillar 31. The lower arm 5 can be fixed to the first support pillar 31 at a predetermined height position. The lower arm 5 may also be attached to, for example, the second support pillar 32.

[0025] The maintenance cart 1 of this embodiment has multiple lower arms 5. The number of lower arms 5 may be any number. In this embodiment, the number of lower arms 5 is two. The two lower arms 5 are lined up in the width direction. In this embodiment, the two lower arms 5 are independent of each other, and therefore each can move in the vertical direction. Note that the two lower arms 5 may be connected, for example. In this case, the two lower arms 5 can be moved in the vertical direction while maintaining the relative height positions of the two lower arms 5.

[0026] The operating handle 6 is a part that an operator holds by hand to perform operations such as moving the maintenance cart 1. The operating handle 6 extends from the frame 3 in a direction opposite to the support arm 4 and the lower arm 5 (second direction) at a position spaced above the cart base 2. The direction in which the operating handle 6 extends from the frame 3 is the rearward direction (negative direction of the X-axis). In this embodiment, the operating handle 6 extends without inclining in the width direction (Y-axis direction) or up-down direction (Z-axis direction) with respect to the rearward direction. Note that the operating handle 6 may extend in a direction inclined with respect to the rearward direction.

[0027] The operating handle 6 in this embodiment has a horizontal bar 61 extending in the width direction at a position spaced rearward from the frame 3. By grasping the horizontal bar 61 of the operating handle 6, an operator can easily perform operations such as moving the maintenance cart 1.

[0028] The operating handle 6 is movable in the up-down direction relative to the frame 3. In this embodiment, the operating handle 6 is attached to a second support column 32 of the frame 3 extending in the up-down direction. This allows the operating handle 6 to move in the up-down direction along the second support column 32. The operating handle 6 can be fixed to the second support column 32 at a predetermined height position. Note that the operating handle 6 may also be attached to the first support column 31, for example. Taking into consideration ease of operation of the maintenance cart 1, the height position of the operating handle 6 is preferably set at waist height of an operator (for example, 60 cm or more above the reference plane G).

[0029] The maintenance cart 1 (particularly the support arm 4) may be made of any material as long as it has enough strength to support the weight of the lid 110. The material of the maintenance cart 1 (particularly the support arm 4) may be, for example, metal or hard plastic.

[0030] Next, a usage example of the maintenance cart 1 of this embodiment will be described with reference to Figs. As shown in Figures 3 to 5, the maintenance cart 1 is mainly used when attaching and detaching a lid 110 attached to a side of the housing 100 to and from the housing 100. In the example shown in Figures 3 to 5, the lid 110 is fixed to the housing 100 by a fixing screw 120 with the lid 110 covering the opening 101 of the housing 100. The lid 110 is removed from the housing 100, for example, for maintenance of various devices housed inside the housing 100.

[0031] The operation of removing the lid 110 from the housing 100 using the maintenance cart 1 will be described. When removing the lid 110 from the housing 100, first, as shown in FIG. 3, the gripping portion 111 of the lid 110 is supported from below by the support arm 4 of the maintenance cart 1. In the state shown in FIG. 3, the tip of the cart base 2 enters the underside of the housing 100. As a result, the lid 110 is positioned above the cart base 2. Therefore, even if the weight of the lid 110 acts on the support arm 4, it is possible to prevent the maintenance cart 1 from falling forward. In other words, the support arm 4 can stably support the lid 110.

[0032] 4, the fixing screws 120 are removed from the housing 100 and the lid 110. As a result, almost the entire weight of the lid 110 acts on the support arm 4. However, as described above, since the tip of the cart base 2 is inserted under the housing 100, the maintenance cart 1 will not tip forward.

[0033] Finally, as shown in Fig. 5, the maintenance cart 1 is moved backward (negative direction of the X-axis) so as to move away from the housing 100. At this time, the gripping portion 111 of the lid 110 supported by the support arm 4 is caught on the protrusion 41 of the support arm 4, so that the gripping portion 111 does not fall off the tip of the support arm 4. Also, the lid 110 supported by the support arm 4 rotates about the gripping portion 111 as a fulcrum so that a portion of the lid 110 located below the gripping portion 111 (lower portion) moves backward due to the weight of the lid 110. As a result, the lower portion of the lid 110 comes into contact with the tip of the lower arm 5 and is supported by the lower arm 5.

[0034] 5, the lid 110 supported by the support arm 4 and the lower arm 5 is located inside the cart base 2 (particularly the casters 21) in the front-rear direction. This prevents the maintenance cart 1 from tipping over in the front-rear direction due to the weight of the lid 110. In addition, two different portions of the lid body 110 are supported by the support arm 4 and the lower arm 5. This makes it possible to suppress or prevent the lid body 110 from swinging about the gripping portion 111 supported by the support arm 4 as a fulcrum. Therefore, the lid body 110 can be stably held on the maintenance cart 1.

[0035] The operation of attaching the lid 110 held by the maintenance cart 1 to the housing 100 can be performed by carrying out the above-described removal operations in reverse order.

[0036] As described above, in the maintenance cart 1 of this embodiment, the support arm 4 provided above the cart base 2 can support the gripping portion 111 of the lid 110 from below. Therefore, the lid 110 can be smoothly transported by the casters 21 of the cart base 2 while being supported by the support arm 4. This makes it possible to easily attach and detach the large and heavy lid 110 to and from the housing 100 while being supported by the support arm 4.

[0037] In addition, in the maintenance cart 1 of this embodiment, the protrusion 41 provided at the tip of the support arm 4 can suppress or prevent the gripping portion 111 placed on the support arm 4 from falling off the tip of the support arm 4.

[0038] Furthermore, in the maintenance cart 1 of this embodiment, the support arm 4 is vertically movable relative to the frame 3. Therefore, the height position H4 of the support arm 4 can be appropriately adjusted according to the height position of the gripping portion 111 of the lid 110 attached to the housing 100. This allows various lids 110 with gripping portions 111 at different height positions to be easily supported by the support arm 4.

[0039] In addition, in the maintenance cart 1 of this embodiment, the length L4 of the support arm 4 is adjustable. By appropriately adjusting the position of the tip of the support arm 4, various lid bodies 110 having different sizes and positions of the center of gravity can be stably held by the support arm 4 and the lower arm 5.

[0040] Moreover, the maintenance cart 1 of this embodiment includes a lower arm 5 that is located lower than the support arm 4 and supports a lower portion of the lid body 110. Therefore, while the gripping portion 111 of the lid body 110 is supported by the support arm 4, the lower portion of the lid body 110 can be supported by the lower arm 5. In other words, since two different portions of the lid body 110 are supported, the lid body 110 can be stably held on the maintenance cart 1.

[0041] Furthermore, in the maintenance cart 1 of this embodiment, the length L5 of the lower arm 5 is shorter than the length L4 of the support arm 4. This makes it possible to suppress or prevent the tip of the lower arm 5 from contacting the outer surface 110a of the cover 110 when the support arm 4 supports the gripping portion 111 of the cover 110. In other words, it is possible to suppress the lower arm 5 from interfering with the process of supporting the gripping portion 111 with the support arm 4. This makes it easy to perform the task of holding the cover 110 with the maintenance cart 1.

[0042] Furthermore, in the maintenance cart 1 of this embodiment, the lower arm 5 is vertically movable relative to the frame 3. Furthermore, the length L5 of the lower arm 5 is adjustable. Therefore, the position of the tip of the lower arm 5 with which the outer surface 110a of the cover 110 comes into contact can be appropriately adjusted according to the size and center of gravity of the cover 110. This allows the support arm 4 and the lower arm 5 to stably hold various cover bodies 110 with different sizes and center of gravity positions.

[0043] Furthermore, in the maintenance cart 1 of this embodiment, a cushioning material 51 for protecting the outer surface 110a of the lid body 110 is provided at the tip of the lower arm 5. This makes it possible to suppress or prevent the outer surface 110a of the lid body 110 from being damaged even if the tip of the lower arm 5 comes into contact with the outer surface 110a of the lid body 110.

[0044] Moreover, in the maintenance cart 1 of this embodiment, the cart base 2 protrudes forward further than the tip of the support arm 4. Furthermore, the casters 21 of the cart base 2 are positioned forward further than the tip of the support arm 4. This makes it possible to prevent the maintenance cart 1 from tipping in the first direction due to the weight of the cover 110 when the gripping portion 111 of the cover 110 is supported by the support arm 4. In other words, the cover 110 can be stably held on the maintenance cart 1.

[0045] Furthermore, in the maintenance cart 1 of this embodiment, the operating handle 6 extends from the frame 3 to the opposite side to the support arm 4. This allows the worker to grip the operating handle 6 without interfering with the lid body 110 supported by the support arm 4. This allows the worker to easily transport the lid body 110 held by the maintenance cart 1.

[0046] (Example) The present invention will be described in more detail below using examples, but the present invention is not limited to these examples. 6, each of Examples 1 to 3 and Comparative Example involves an operator removing lid 110 weighing 15 kg that is screwed to housing 100 from housing 100, and then attaching lid 110 to housing 100 by screwing. However, the operations of Examples 1 to 3 and Comparative Example differ from each other in the configuration of a maintenance cart used for removing and attaching lid 110, or in whether or not a maintenance cart is used. Below, Examples 1 to 3 and Comparative Example will be described respectively.

[0047] Example 1 Example 1 is an operation in which an operator attaches and detaches the lid 110 to and from the housing 100 using the maintenance cart 1 of the above-described embodiment.

[0048] Example 2 In Example 2, an operator attaches and detaches the lid 110 to and from the housing 100 using a maintenance cart configured by removing the lower arm 5 from the maintenance cart 1 of the above-described embodiment.

[0049] Example 3 In Example 3, an operator attaches and detaches the lid 110 to and from the housing 100 using a maintenance cart in which the tip of the support arm 4 extends forward beyond the cart base 2 in the maintenance cart 1 of the above embodiment.

[0050] (Comparative Example) In the comparative example, a worker manually attaches and detaches the lid 110 to and from the housing 100 without using a maintenance cart.

[0051] FIG. 6 shows the approximate time required for each operation (removal and installation of the lid body 110) in Examples 1 to 3 and the Comparative Example, as well as a sensory evaluation of the ease of removal and installation, safety, and ease of management for each operation in Examples 1 to 3 and the Comparative Example.

[0052] Regarding the evaluation of ease of attachment and detachment, a case where the worker felt that the lid 110 could be attached and detached stably and easily was rated as ○ (good), a case where the worker felt that the lid 110 could be attached and detached stably or easily was rated as △ (fair), and a case where the worker felt that the lid 110 was attached and detached unstable and difficult was rated as × (not good).

[0053] Regarding the evaluation of safety, a case where the worker felt that there was a small possibility of the lid body 110 dropping and the maintenance cart 1 tipping over during the work of attaching and detaching the lid body 110 was marked as ○ (good), and a case where the worker felt that there was a higher possibility of the lid body 110 dropping and the maintenance cart 1 tipping over during the work of attaching and detaching the lid body 110 than in the case of "○" was marked as △ (fair). Also, a case where the worker felt that there was an even higher possibility of the lid body 110 dropping and the maintenance cart 1 tipping over during the work of attaching and detaching the lid body 110 than in the case of "△" was marked as × (not good).

[0054] Regarding the evaluation of ease of management, a case where the worker felt that the lid body 110 removed from the housing 100 could be stably and easily stored was rated as ○ (good), and a case where the worker felt that the lid body 110 removed from the housing 100 could be easily but not stably stored was rated as △ (fair). Also, a case where the worker felt that the lid body 110 removed from the housing 100 could not be easily stored was rated as × (not good).

[0055] As shown in FIG. 6, the comparative example took the longest time, 260 seconds, to remove and attach the lid 110. The comparative example was rated as "x (not good)" for ease of removal and attachment, safety, and ease of management. This was because the worker had to lift, hold, and carry the heavy lid 110 himself. For example, the reason why the ease of removal and attachment was rated as "x (not good)" was because the worker had to support the lid 110 with his or her hands while removing or attaching the screws. The reason why the safety was rated as "x (not good)" was because there was a high possibility that the worker would drop the lid 110 that he or she lifted with his or her hands. The reason why the ease of management was rated as "x (not good)" was because the removed lid 110 had to be leaned against a wall or the like, that is, because the storage space for the lid 110 was limited.

[0056] On the other hand, in the work in Examples 1 to 3, since the maintenance cart 1 was used in all cases, the commercial time was 180 to 190 seconds, which was shorter than that in the comparative example. The ease of removal and attachment, safety, and ease of management of Example 3 were all rated as "Fair (good)". The reason for this is that when the gripping portion 111 of the lid 110 was supported by the support arm 4, the maintenance cart 1 was likely to tip forward, and as a result, the worker felt that the removal and attachment of the lid 110 was unstable.

[0057] The ease of attachment / detachment and ease of management of Example 2 were both rated as "○ (good)". This was because the worker felt that when the gripping portion 111 of the lid body 110 was supported by the support arm 4, the maintenance cart 1 was not likely to tip over, and that the worker himself did not need to support the lid body 110 during the attachment / detachment work of the lid body 110. The safety of Example 2 was rated as "△ (fair)". This was because the worker felt that because the lid body 110 was supported only by the support arm 4, the lid body 110 would swing on the cart as the maintenance cart 1 moved, increasing the possibility that the maintenance cart 1 would tip over.

[0058] The ease of attachment / detachment, safety, and ease of management of Example 1 were all rated as "good". The reasons for grading the ease of attachment / detachment and ease of management as "good" are the same as those of Example 2. The reason for grading the safety as "good" is that the operator felt that because the lid body 110 is supported by the support arm 4 and the lower arm 5, the lid body 110 does not swing on the cart even when the maintenance cart 1 moves, and therefore there is little possibility of the maintenance cart 1 falling over.

[0059] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

[0060] In the present invention, the support arm 4 may be inclined, for example, upward (positive direction of the Z axis) with respect to the forward direction. In addition, a cushion that elastically compresses and deforms, such as rubber, may be provided on the surface of the support arm 4 (particularly the surface of the support arm 4 that supports the gripping part 111), or a recess into which the gripping part 111 fits may be formed. With this configuration, even if the tip of the support arm 4 is not provided with a protrusion 41, it is possible to suppress or prevent the gripping part 111 placed on the support arm 4 from falling off the tip of the support arm 4.

[0061] In the present invention, the multiple support arms 4 aligned in the width direction may be movable in the width direction (orthogonal direction) relative to the frame 3, for example. In this case, the distance between two support arms 4 adjacent in the width direction can be adjusted. This allows these two support arms 4 to stably support gripping parts 111 of various sizes. In particular, even if the gripping parts 111 vary in size in the width direction, the gripping parts 111 can be stably supported by the two support arms 4. [Explanation of symbols]

[0062] 1 Maintenance trolley 2 Cart Base 3 Frame 4 Support Arm 5 Lower Arm 6 Operating handle 21 Caster 41 Protrusion 51 Cushioning material 100 Case 101 Opening 110 Lid 110a Exterior 111 Gripping part

Claims

1. A maintenance cart for holding a lid having a gripping portion on an outer surface thereof, A cart base having casters; A frame extending upward from the carriage base; A maintenance cart comprising: a support arm extending from the frame in a first direction intersecting the extension direction of the frame at a position spaced above the cart base, and supporting the gripping portion from below.

2. 2. The maintenance cart according to claim 1, wherein a protrusion protruding upward is provided at a tip of the support arm.

3. 3. The maintenance cart according to claim 1, wherein the support arm is vertically movable relative to the frame.

4. 3. The maintenance cart according to claim 1, wherein the length of the support arm is adjustable.

5. A maintenance cart as described in claim 1 or claim 2, further comprising a lower arm extending from the frame in the first direction between the cart base and the support arm in the vertical direction and supporting a portion of the outer surface of the lid body below the gripping portion.

6. 6. The maintenance cart according to claim 5, wherein the length of the lower arm is shorter than the length of the support arm.

7. The maintenance cart according to claim 5 , wherein the lower arm is vertically movable relative to the frame.

8. 6. The maintenance cart according to claim 5, wherein the length of the lower arm is adjustable.

9. 6. The maintenance cart according to claim 5, wherein a cushioning material for protecting an outer surface of the lid body is provided at the tip of the lower arm.

10. The carriage base protrudes in the first direction beyond the tip of the support arm, The maintenance cart according to claim 1 or 2, wherein the casters are located at the leading ends of the cart base in the first direction.

11. 3. The maintenance cart according to claim 1, further comprising an operating handle extending from the frame to a side opposite to the support arm.

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