Drum lid opening and closing tool

Abstract

To provide a drum lid opening / closing tool with improved operability and reliable opening / closing operation. [Solution] A drum lid opening / closing tool (10) has a lid fitting (25) that can be fitted with the large and small lids provided on the drum, and a rotational force transmission body that applies a rotational force to the lid fitting (25), and opens and closes the large and small lids by rotating the lid fitting (25).The lid fitting (25) has a connecting part (31) that can be attached and detached to the rotational force transmission body, a cylindrical large lid fitting part (32) that is connected to the connecting part (31) and can be fitted with a large lid fitted part provided on the large lid, and a small lid fitting part that is connected to the connecting part (31) and is provided inside the large lid fitting part (32) and can be fitted with a small lid fitted part provided on the small lid, and the rotational force transmission body is an operating handle (24) that has a ratchet mechanism (29).

Description

[Technical Field]

[0001] The present invention relates to a drum opening and closing tool for opening and closing the lid of a drum. [Background technology]

[0002] A known example of a conventional drum lid opening and closing tool is the drum lid opening and closing jig disclosed in Patent Document 1. The drum lid opening and closing jig disclosed in Patent Document 1 is a drum lid opening and closing jig for opening and closing two screw lids, one large and one small, attached to a drum. This lid opening and closing jig includes a handle portion, a large lid fitting portion provided on one end of the handle portion and fitting with a fitted portion provided on the large lid of the drum, and a small lid fitting portion provided inside the large lid fitting portion and fitting with a fitted portion provided on the small lid of the drum.

[0003] The large lid fitting part of the drum opening and closing jig of Patent Document 1 has a cylindrical part that can be inserted into the inside of the thread groove of the large lid and two notches on the end of the cylindrical part. The small lid fitting part has a protrusion that fits into the groove of the small lid fitting part on the small lid. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-195460 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the drum opening and closing jig disclosed in Patent Document 1, an operator can open the lid by engaging the opening and closing jig with the large or small lid and turning the handle counterclockwise. However, after rotating the handle to a predetermined angle, the operator must re-attach the opening and closing jig to the lid. This results in cumbersome and time-consuming opening and closing of the large or small lid. Furthermore, the large lid engaging portion of the drum opening and closing jig disclosed in Patent Document 1 is a thin-walled cylindrical portion. Therefore, even when the large lid engaging portion is engaged with the mating portion of the large lid, a large clearance tends to be created. Furthermore, if the handle is operated in an insufficiently engaged state, there is a risk of a missed rotation. Missed rotation not only wastes time and effort, but also has the potential to lead to unpredictable situations.

[0006] The present invention has been made in consideration of the above problems, and an object of the invention is to provide a drum lid opening and closing tool that is easy to operate and ensures reliable opening and closing operations. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a drum lid opening and closing tool having a lid fitting body that can be fitted with a large lid and a small lid provided on a drum, and a rotational force transmission body that imparts a rotational force to the lid fitting body, and the large lid and the small lid are opened and closed by rotating the lid fitting body, wherein the lid fitting body has a connecting part that is detachable from the rotational force transmission body, a cylindrical large lid fitting part that is connected to the connecting part and can be fitted with a large lid fitted part provided on the large lid, and a small lid fitting part that is connected to the connecting part and is provided inside the large lid fitting part and can be fitted with a small lid fitted part provided on the small lid, and the rotational force transmission body is a power tool having an operating handle or a rotary drive shaft equipped with a ratchet mechanism.

[0008] According to this invention, the lid fitting body can be connected to a power tool having an operating handle or a rotary drive shaft equipped with a ratchet mechanism, which is a rotational force transmission body, thereby improving the operability of the opening and closing tool when opening and closing the large and small lids and making the opening and closing operation more reliable.

[0009] In the above-described drum lid opening and closing tool, the small lid fitting portion may be a square rod-shaped body. In this case, since the small lid fitting portions are rod-shaped, it is easy to reduce the clearance between the small lid fitting portions and the small lid receiving portions, and the small lid receiving portions can be fitted to the small lid receiving portions with little rattle. This allows for reliable opening and closing of the drum lid opening and closing tool when opening and closing the small lid.

[0010] In addition, in the above-mentioned drum lid opening and closing tool, the large lid fitting portion may have an outer peripheral surface and an inner peripheral surface centered on the center of rotation, and the large lid fitting portion may be configured so that the distance between the inner peripheral surface and the outer peripheral surface in the radial direction is set as large as possible. In this case, by setting the radial distance between the inner and outer surfaces of the large lid fitting portion as large as possible, the radial thickness of the large lid fitting portion increases, increasing its rigidity and suppressing deformation or damage to the large lid fitting portion.

[0011] In the above-described drum lid opening / closing tool, the connecting portion, the large lid fitting portion, and the small lid fitting portion may be integrally formed. In this case, since the connecting portion, the large lid fitting portion, and the small lid fitting portion are integrally formed, the rigidity of the lid fitting body can be increased, and the durability of the drum lid opening and closing tool can be improved.

[0012] In the above-described drum lid opening / closing tool, the lid fitting body may have a space on the inner periphery of the large lid fitting portion into which the outer ring portion of the small lid can be inserted. In this case, the outer ring portion of the small lid is inserted into the space on the inner periphery of the large lid fitting portion, so the small lid is less likely to be damaged when opening and closing. [Effects of the Invention]

[0013] According to the present invention, a drum lid opening and closing tool can be provided that is easy to operate and ensures reliable opening and closing operations. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a drum lid opening and closing tool according to an embodiment of the present invention; [Figure 2] 1 is a perspective view of a drum according to an embodiment of the present invention; [Figure 3] (a) is a perspective view of the large lid of the drum, and (b) is a perspective view of the small lid of the drum. [Figure 4] 1A is a plan view of a lid fitting body in the lid opening / closing tool, and FIG. 1B is a side view of the lid fitting body. [Figure 5] 4(a) is a view taken along the arrow in FIG. 4(a), and FIG. 4(b) is a bottom view of the lid fitting body. [Figure 6] 1A is an explanatory view illustrating a state in which the lid fitting body is fitted with the large lid, and FIG. 1B is an explanatory view illustrating a state in which the lid fitting body is fitted with the small lid. [Figure 7] FIG. 10 is a perspective view of the main part showing the state in which the large lid of the drum is being removed using the lid opening / closing tool. [Figure 8] 1 is a side view of a lid opening and closing tool according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0015] A drum lid opening / closing tool (hereinafter simply referred to as "lid opening / closing tool") according to an embodiment of the present invention will be described below with reference to the drawings. The lid opening / closing tool 10 of this embodiment shown in Fig. 1 is a tool for manually opening and closing a large lid 15 and a small lid 17 provided on a drum 11 shown in Fig. 2.

[0016] As shown in Figure 2, drum 11 has a substantially cylindrical drum body 12. As shown in Figure 3(a), a top plate 13 of drum body 12 is provided with a large diameter opening 14 for the inlet and outlet of liquid. A large lid 15 is provided that is detachable from top plate 13 and seals large diameter opening 14. As shown in Figure 3(b), top plate 13 is provided with a small diameter opening 16 for venting air. A small lid 17 is provided that is detachable from top plate 13 and seals small diameter opening 16.

[0017] As shown in FIG. 3(a), a male thread 18 is formed on the outer ring of the large lid 15. The male thread 18 screws into a female thread (not shown) provided on the top plate 13 of the large-diameter opening 14. A metal claw 19 having a pair of claws 20 is provided on the surface of the large lid 15. The pair of claws 20 are mountain-shaped portions that protrude from the inner periphery of the large lid 15 toward the center of the large lid 15 and face each other. The metal claws 19 correspond to the large lid mating portion. As shown in FIG. 3(b), a male thread 21 is formed on the outer ring of the small lid 17. The male thread 21 screws into a female thread (not shown) provided on the top plate 13 of the small-diameter opening 16. A U-shaped metal fitting 22 is provided on the surface of the small lid 17. The U-shaped metal fitting 22 corresponds to the small lid mating portion.

[0018] As shown in Fig. 1, the lid opening / closing tool 10 has an operating handle 24 as a rotation transmission body, and a lid fitting body 25. The operating handle 24 corresponds to the rotation transmission body that manually applies a rotational force to the lid fitting body 25 when an operator opens or closes the large lid 15 or the small lid 17. The operating handle 24 has a long operating handle portion 26 and a head portion 27 that has a ratchet mechanism 29. The operating handle portion 26 is provided contiguous with the head portion 27, and is the portion that an operator grips when opening or closing the large lid 15 or the small lid 17.

[0019] The head portion 27 is a portion that can apply a rotational force to the lid fitting 25. The head portion 27 is provided with a rotational shaft portion 28 that can rotate relative to the head portion 27. The rotational shaft portion 28 is a quadrangular prism-shaped shaft that can be connected to the lid fitting 25. The head portion 27 is provided with a ratchet mechanism 29. The ratchet mechanism 29 is a known mechanism that includes a one-way clutch and limits the direction of the rotational force relative to the rotational shaft portion 28. The ratchet mechanism 29 includes a lever member 30 that switches the rotational direction of the rotational shaft portion 28.

[0020] Next, the lid fitting body 25 will be described. The lid fitting body 25 can be fitted to the large lid 15 or the small lid 17, and can rotate integrally with the large lid 15 or the small lid 17 when opening or closing. In this embodiment, the lid fitting body 25 is provided at one end of the operating handle 24 by being connected to a rotation shaft portion 28. As shown in Figures 4(a) and 4(b), the lid fitting body 25 has a connecting portion 31, a large lid fitting portion 32, and a small lid fitting portion 33.

[0021] In the lid fitting body 25 of this embodiment, the connecting portion 31, the large lid fitting portion 32, and the small lid fitting portion 33 are integrally formed. Specifically, the lid fitting body 25 is made of alloy tool steel, and the connecting portion 31, the large lid fitting portion 32, and the small lid fitting portion 33 are integrally formed by cutting. In addition, the lid fitting body 25 is surface-treated by vacuum quenching to increase the surface hardness and improve durability against wear and deformation.

[0022] The connecting portion 31 is a cylindrical portion and, as shown in Fig. 5(a), has a pair of circular end faces 34, 35 and an outer peripheral surface 36. One of the circular end faces 34 is drilled with a shaft hole 37 that allows the rotary shaft portion 28 to be inserted. As shown in Fig. 4(a), the shaft hole 37 is a bottomed hole with a substantially square cross section. As shown in Fig. 5(b), the other circular end face 35 is provided with a small cover fitting portion 33.

[0023] The large lid fitting portion 32 is a substantially cylindrical portion that extends continuously from the connecting portion 31 and is concentric with the connecting portion 31. As shown in FIG. 5( a), the large lid fitting portion 32 has a connecting portion-side end face 38, an outer peripheral surface 39, an inner peripheral surface 40, and a tip surface 41. The connecting portion-side end face 38 is a surface that extends radially outward from the outer peripheral surface 36 of the connecting portion 31 and is substantially parallel to the circular end faces 34, 35 of the connecting portion 31. The outer peripheral surface 39 and the inner peripheral surface 40 are peripheral surfaces that are centered on the rotation center of the lid fitting body 25 and are concentric with the outer peripheral surface 36 of the connecting portion 31.

[0024] As shown in FIG. 4(a), the diameter of the outer peripheral surface 39 of the large lid fitting portion 32 is larger than the diameter of the outer peripheral surface 36 of the connecting portion 31. Furthermore, as shown in FIG. 6(a), the diameter of the outer peripheral surface 39 is smaller than the diameter of the inner peripheral portion of the large lid 15. The diameter of the inner peripheral surface 40 is larger than the diameter of the outer ring portion of the small lid 17. Therefore, the distance between the inner peripheral surface 40 and the outer peripheral surface 39 in the radial direction of the large lid fitting portion 32 is set as large as possible, and the radial thickness of the large lid fitting portion 32 is sufficiently large. Furthermore, as shown in FIG. 6(b), a space is formed on the inner peripheral side of the large lid fitting portion 32 into which the outer ring portion of the small lid 17 can be inserted. The tip surface 41 is the surface that abuts against the metal hook 19 of the large lid 15. The distance between the connecting portion side end surface 38 and the tip surface 41 is the axial length of the large lid fitting portion 32. The axial length of the large lid fitting portion 32 is the length that protrudes from the outer ring portion of the large lid 15 when the large lid fitting portion 32 is fitted to the large lid 15.

[0025] The large lid fitting portion 32 has a pair of notches 42. The pair of notches 42 are cut from the tip surface 41 to align with the position of the pair of claws 20 of the large lid 15 so as to engage with the pair of claws 20. The outer peripheral surface 39 is formed with chamfered surfaces 43 on both sides of the notches 42. The pair of chamfered surfaces 43 are approximately parallel to each other. The outer peripheral surface 39 is also formed with inclined surfaces 44 extending from the chamfered surfaces 43 on both sides of the notches 42. The pair of inclined surfaces 44 are surfaces that follow the mountain-like shape of the claws 20.

[0026] By forming the notch 42, a blade-like edge 45 is formed in the large lid fitting portion 32 by the inclined surface 44 and the inner peripheral surface 40. When the large lid fitting portion 32 is fitted into the large lid 15, the edge 45 can be engaged with the claw portion 20 of the large lid 15. Furthermore, as shown in FIG. 6(a), when the large lid fitting portion 32 is fitted into the large lid 15, there is almost no gap between the large lid fitting portion 32 and the inner peripheral portion of the large lid 15. In this embodiment, the tip of the edge 45 is sharp, but the tip may be rounded or formed from multiple flat surfaces.

[0027] Next, the small lid fitting portion 33 of the lid fitting body 25 will be described. The small lid fitting portion 33 is a square rod-shaped body that protrudes from the circular end surface 35 of the connecting portion 31. The small lid fitting portion 33 can be fitted into the groove of the U-shaped metal fitting 22, which is the small lid fitted portion. The cross-sectional shape of the small lid fitting portion 33 is rectangular. As shown in Figure 6(b), the small lid fitting portion 33 has a pair of first surfaces 46 corresponding to the rectangular cross section, a pair of second surfaces 47 corresponding to the short sides of the rectangle, and a tip surface 48.

[0028] When the small lid fitting portion 33 is fitted into the groove of the U-shaped metal fitting 22, the pair of first surfaces 46 are aligned along the length of the groove, and the second surface 47 is aligned along the width of the groove of the U-shaped metal fitting 22. The axial length of the small lid fitting portion 33 is equal to the length from the circular end face 35 to the tip face 48. In this embodiment, the tip face 48 is substantially flush with the tip face 41 of the large lid fitting portion 32.

[0029] Next, the procedure for opening and closing the large lid 15 and the small lid 17 using the lid opening / closing tool 10 of this embodiment will be described. First, the case of opening the large lid 15 of the drum 11 will be described. The operator aligns the lid fitting body 25 and fits it to the large lid 15 so that the claw portion 20 of the large lid 15 in the closed state fits into the notch 42 of the large lid fitting portion 32. Next, the rotating shaft portion 28 of the operating handle 24 is inserted into the shaft hole 37 of the lid fitting body 25.

[0030] As shown in Figure 7, the lever member 30 of the ratchet mechanism 29 is positioned to the right, allowing counterclockwise rotation of the rotating shaft 28 but not allowing clockwise rotation of the rotating shaft 28. Next, the operator grasps the operating handle 26 and rotates it counterclockwise, and then rotates it clockwise. The rotation of the operating handle 26 rotates the rotating shaft 28 counterclockwise, causing the lid fitting body 25 to rotate counterclockwise together with the rotating shaft 28. The counterclockwise rotation of the lid fitting body 25 causes the large lid fitting portion 32 to come into contact with the claw portion 20, rotating the large lid 15 counterclockwise, which is the direction in which the large lid 15 opens.

[0031] After rotating the operating handle portion 26 counterclockwise, the operating handle portion 26 is rotated clockwise in a manner equivalent to the counterclockwise rotation, but the rotating shaft portion 28 does not rotate clockwise even when the operating handle portion 26 is rotated clockwise. Then, the operator alternately rotates the operating handle portion 26 counterclockwise and clockwise, thereby removing the large lid 15 from the large-diameter opening 14.

[0032] As shown in FIG. 6(a), there is almost no gap between the inner periphery of the large lid 15 and the large lid fitting portion 32, so the lid fitting body 25 is less likely to rattle relative to the large lid 15, and the lid fitting body 25 will not come off the large lid 15 when the operating handle 24 is operated. Therefore, when the lid opening / closing tool 10 is used to open or close the large lid 15, there is no swinging of the lid opening / closing tool 10. When closing the large lid 15, the lever member 30 of the ratchet mechanism 29 is switched to the left, which allows the rotating shaft 28 to rotate clockwise but does not allow the rotating shaft 28 to rotate counterclockwise. In this state, the large lid 15 is closed by turning the operating handle 26 clockwise.

[0033] Next, we will explain how to open the small lid 17 of the drum 11. The worker inserts the small lid fitting portion 33 into the groove of the U-shaped metal fitting 22 of the closed small lid 17, and fits the lid fitting body 25 to the small lid 17. At this time, as shown in Figure 6(b), there is almost no gap between the first surface 46 of the small lid fitting portion 33 and the U-shaped metal fitting 22. In addition, the outer ring portion of the small lid 17 is surrounded by the inner peripheral surface 40 of the large lid fitting portion 32. The gap between the outer ring portion of the small lid 17 and the inner peripheral surface 40 is very small.

[0034] Next, the rotating shaft 28 of the operating handle 24 is inserted into the shaft hole 37 of the lid fitting 25. The operator positions the lever member 30 of the ratchet mechanism 29 to the right, grasps the operating handle 26, and rotates it counterclockwise. This rotates the rotating shaft 28 counterclockwise, and the lid fitting 25 rotates counterclockwise together with the rotating shaft 28. The counterclockwise rotation of the lid fitting 25 causes the small lid fitting 33 to contact the U-shaped metal fitting 22 and rotate counterclockwise, which is the direction that opens the small lid 17. The small lid 17 is released from the small-diameter opening 16 by alternately rotating the operating handle 26 counterclockwise and then rotating it clockwise, which corresponds to the counterclockwise rotation. To close the small lid 17, the lever member 30 of the ratchet mechanism 29 is switched to the left, and the small lid 17 is closed by alternately rotating it clockwise and counterclockwise.

[0035] The lid opening / closing tool 10 according to this embodiment has the following advantages. (1) The lid fitting body 25 can be connected to the operating handle 24 equipped with a ratchet mechanism 29, which is a rotational force transmission body, thereby improving the operability of the lid opening / closing tool 10 when opening and closing the large lid 15 and small lid 17 and making the opening and closing operation more reliable.

[0036] (2) Because the small lid fitting portion 33 is a square rod-shaped body, it is easy to reduce the clearance with respect to the U-shaped metal fitting 22 serving as the small lid fitting portion, and the small lid fitting portion 33 can be fitted to the U-shaped metal fitting 22 with little rattle. This allows for reliable opening and closing operations of the lid opening and closing tool 10 when opening and closing the small lid 17.

[0037] (3) The large lid fitting portion 32 has an outer peripheral surface 39 and an inner peripheral surface 40 that are centered on the center of rotation of the lid fitting body 25. The distance between the inner peripheral surface 40 and the outer peripheral surface 39 in the radial direction of the large lid fitting portion 32 is set as large as possible, which increases the radial thickness of the large lid fitting portion 32 and increases its rigidity, making it possible to suppress deformation and breakage of the large lid fitting portion 32.

[0038] (4) The connecting portion 31, the large lid fitting portion 32, and the small lid fitting portion 33 are integrally formed, which increases the rigidity of the lid fitting body 25 and improves the durability of the lid opening / closing tool 10. In addition, the surface hardness of the lid fitting body 25 is increased by surface treatment using vacuum quenching, which further reduces wear and deformation.

[0039] (5) The lid fitting body 25 has a space on the inner periphery side of the large lid fitting portion 32 into which the outer ring portion of the small lid 17 can be inserted. Therefore, the outer ring portion of the small lid 17 is inserted into the space on the inner periphery side of the large lid fitting portion 32, so that the small lid 17 is protected by the large lid fitting portion 32 when the small lid 17 is opened or closed and is less likely to be damaged.

[0040] (6) The lid fitting body 25 is rotated by the operating handle 24 equipped with the ratchet mechanism 29, so there is no need to refit the lid fitting body 25 into the large lid 15 or small lid 17, reducing the burden on the worker. Also, by providing an operating handle 24 suitable for each worker, the burden on each worker can be reduced.

[0041] (Second embodiment) Next, a lid opener / closer according to a second embodiment will be described. The lid opener / closer of this embodiment differs from the first embodiment in that the rotational force transmission body is a power tool having a rotary drive shaft. In this embodiment, the same configuration as in the first embodiment will be referred to and the same reference numerals will be used.

[0042] The lid opener / closer 50 shown in FIG. 8 includes the lid fitting 25 and an impact wrench 51 as a power tool. The impact wrench 51 corresponds to a rotational force transmission body that applies rotational force to the lid fitting 25 using power. The impact wrench 51 includes a housing 52 that houses a drive unit 53. The drive unit 53 is primarily composed of an electric motor. The housing 52 has a handgun-like shape and includes a grip 54. The grip 54 includes a switch 55 that supplies power to the drive unit 53. A shaft hole 56 is formed at the tip of the housing 52, and a rectangular rotary shaft 57, which serves as a rotary drive shaft, protrudes from the shaft hole 56 of the housing 52. The rectangular rotary shaft 57 has a substantially square cross section across the rotation axis P and can be fitted into the shaft hole 37 of the lid fitting 25. The rectangular rotary shaft 57 of the impact wrench 51 can rotate forward and backward. When the square rotary shaft 57 rotates forward, the large lid 15 and the small lid 17 are closed, and when the square rotary shaft 57 rotates backward, the large lid 15 and the small lid 17 are opened.

[0043] In this embodiment, the worker fits the lid fitting body 25 to the large lid 15 or the small lid 17, and then connects the impact wrench 51 to the lid fitting body 25. Then, when the worker operates the switch 55 to rotate the square rotating shaft 57 in the reverse direction, the drive unit 53 drives the large lid 15 or the small lid 17 to rotate in the opening direction and remove it from the drum 11. To close the large lid 15 or the small lid 17, the square rotating shaft 57 is simply rotated in the forward direction.

[0044] According to the lid opening / closing device 50 of this embodiment, the rotational force transmission body is an impact wrench 51 as a power tool, which improves the operability of the lid opening / closing tool 10 and ensures reliable opening and closing operations when opening and closing the large lid 15 and small lid 17. In addition, because the lid fitting body 25 is rotated by the rotational force of the electrically powered drive unit 53, the labor required for the operation can be reduced compared to when the operating handle 24 is used.

[0045] It should be noted that the above-described embodiments represent one embodiment of the present invention, and the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention as described below.

[0046] In the above embodiment, the small cover fitting body is a rectangular rod-shaped body, but is not limited to this. The small cover fitting body may have any shape as long as it can fit into the small cover fitting portion and can transmit a rotational force to the small cover when the cover fitting body is rotated. In the above embodiment, the distance between the inner peripheral surface and the outer peripheral surface of the large lid fitting portion in the radial direction is set as large as possible, but this is not limited to this. The distance between the inner peripheral surface and the outer peripheral surface of the large lid fitting portion in the radial direction may be, for example, half the distance in the embodiment, as long as it does not cause the large lid fitting portion to become thin. In the second embodiment, an electric impact wrench is used as the rotational force transmitting member that applies rotational force to the lid fitting member, but the rotational force transmitting member is not limited to this. For example, the rotational force transmitting member may be a pneumatic impact wrench. [Explanation of symbols]

[0047] 10, 50 Lid opening / closing tool 11 drums 15 Large lid 17 Small lid 19 Claw metal fitting (large lid fitting part) 20 Claw 22 U-shaped metal fitting (small cover fitting part) 24 Operating handle (rotational force transmission body) 25 Lid fitting body 26 Operating handle 27 Head 28 Rotating shaft 29 Ratchet mechanism 31 Connecting part 32 Large lid fitting part 33 Small cover fitting part 37 Shaft hole 39 Outer surface 40 Inner surface 42 Notch 45 Edge 50 Lid opening / closing tool 51 Impact wrench (rotational force transmission body) 57 Square Rotating Axis P rotation axis

Claims

1. a lid fitting body that can be fitted with a large lid and a small lid provided on the drum; a rotational force transmitting body that applies a rotational force to the lid fitting body, A drum lid opening / closing tool that opens and closes the large lid and the small lid by rotating the lid fitting body, The lid fitting body is a connecting portion that is detachable from the rotational force transmitting body; a cylindrical large lid fitting portion connected to the connecting portion and capable of fitting with a large lid fitting portion provided on the large lid; a small lid fitting portion connected to the connecting portion and provided inside the large lid fitting portion, the small lid fitting portion being capable of fitting with a small lid fitted portion provided on the small lid; A drum lid opening / closing tool, characterized in that the rotational force transmitting body is a power tool having an operating handle or a rotary drive shaft equipped with a ratchet mechanism.

2. 2. The drum lid opening and closing tool according to claim 1, wherein the small lid fitting portion is a square rod-shaped body.

3. the large lid fitting portion has an outer peripheral surface and an inner peripheral surface centered on the rotation center, 3. The drum lid opening and closing tool according to claim 1, wherein the large lid fitting portion has a radial distance between the inner peripheral surface and the outer peripheral surface set as large as possible.

4. 3. The drum lid opening / closing tool according to claim 1, wherein the connecting portion, the large lid fitting portion, and the small lid fitting portion are integrally formed.

5. 3. The drum lid opening / closing tool according to claim 1, wherein the lid fitting body has a space on the inner periphery of the large lid fitting portion into which the outer ring portion of the small lid can be inserted.

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