Hole cover opening / closing jig and hole cover opening / closing method

Abstract

To provide a hole cover opening / closing jig capable of stably performing the opening and closing work of a hole cover. [Solution] In one embodiment of the hole cover opening and closing jig, the base includes an arm connecting pin insertion hole into which the arm connecting pin is inserted, and the arm connecting pin insertion hole is an elongated hole whose longitudinal direction follows the ground when the base is placed on the ground, and when the hole cover is opened, the arm connecting pin moves in the arm connecting pin insertion hole so as to approach the side of the hole cover.

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a hole cover opening / closing jig and a hole cover opening / closing method. [Background technology]

[0002] Holes such as handholes and manholes are holes that connect to underground spaces and are closed with hole covers such as handhole covers and manhole covers.

[0003] Hole covers such as handhole covers and manhole covers are heavy. For this reason, hole cover opening and closing jigs have been proposed to facilitate the opening and closing of hole covers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-95411 [Patent Document 2] Utility Model Registration No. 3133294 [Patent Document 3] Japanese Patent Application Laid-Open No. 61-169404 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-55749 [Patent Document 5] Utility Model Registration No. 3202723 Summary of the Invention [Problem to be solved by the invention]

[0005] The operation of opening and closing the hole cover must be stable.

[0006] Therefore, an object of the present invention is to provide a hole cover opening / closing jig and a hole cover opening / closing method that enable stable opening and closing of the hole cover. [Means for solving the problem]

[0007] The hole cover opening / closing jig of the embodiment includes a lifting hook that engages with a hole cover that closes a hole that communicates with an underground space provided underground, a base that is placed on the ground around the hole cover, a lifting arm that has the lifting hook rotatably attached to one end and the other end rotatably supported on the base, and a handle that is connected to the lifting arm. By operating the handle and rotating the lifting arm, the hole cover that the lifting hook is engaged with can be lifted and opened using the principle of leverage. The hole cover opening / closing jig has an arm connecting pin for rotatably supporting the lifting arm on the base, and the base is It includes an arm connecting pin insertion hole into which the arm connecting pin is inserted, and the arm connecting pin insertion hole is an elongated hole whose longitudinal direction follows the ground when the base is placed on the ground, and when the hole cover is opened, the arm connecting pin moves in the arm connecting pin insertion hole so as to approach the side of the hole cover. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a hole cover opening / closing jig and a hole cover opening / closing method that enable stable opening and closing of the hole cover. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view schematically showing a hole cover opening / closing jig 100 according to an embodiment. [Figure 2] FIG. 2 is a side view schematically showing the hole lid 10 that can be opened using the hole lid opening / closing jig 100 according to the embodiment. [Figure 3] FIG. 3 is a side view schematically showing the hanging hook 110 in the hole cover opening and closing jig 100 according to the embodiment. [Figure 4A] FIG. 4A is a side view schematically showing the base 120 of the hole cover opening and closing jig 100 according to the embodiment. [Figure 4B]FIG. 4B is a side view that schematically shows the base 120 in the hole cover opening and closing jig 100 according to the embodiment. [Figure 5A] FIG. 5A is a side view that schematically shows the lifting arm 130 in the hole cover opening and closing jig 100 according to the embodiment. [Figure 5B] FIG. 5B is a side view that schematically shows the lifting arm 130 in the hole cover opening and closing jig 100 according to the embodiment. [Figure 6] FIG. 6 is a side view schematically showing the handle 140 in the hole cover opening and closing jig 100 according to the embodiment. [Figure 7A] FIG. 7A is a side view that schematically shows a state in which the hanging hook 110 of the hole cover opening / closing jig 100 is engaged with the hole cover 10 in the embodiment. [Figure 7B] FIG. 7B is a side view that schematically shows a state in which the hanging hook 110 of the hole cover opening and closing jig 100 is engaged with the hole cover 10 in the embodiment. [Figure 7C] FIG. 7C is a side view that schematically shows a state in which the hanging hook 110 of the hole cover opening and closing jig 100 is engaged with the hole cover 10 in the embodiment. [Figure 7D] FIG. 7D is a side view that schematically shows the state when the hanging hook 110 of the hole cover opening and closing jig 100 is engaged with the hole cover 10 in the embodiment. [Figure 7E] FIG. 7E is a side view that schematically shows a state in which the hanging hook 110 of the hole cover opening and closing jig 100 is engaged with the hole cover 10 in the embodiment. [Figure 7F] FIG. 7F is a side view that schematically shows how the hanging hook 110x of the comparative example is engaged with the hole cover 10. As shown in FIG. [Figure 8A] FIG. 8A is a side view that schematically shows a state in which the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100 of the embodiment. [Figure 8B] FIG. 8B is a side view that schematically shows how the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100x of the comparative example. [Figure 9A] FIG. 9A is a side view that schematically shows a state in which the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100 of the embodiment. [Figure 9B] FIG. 9B is a side view that schematically shows how the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100x of the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0010] [A] Hole cover opening and closing jig configuration Fig. 1 is a side view schematically showing a hole lid opening / closing jig 100 according to an embodiment. Fig. 2 is a side view schematically showing a hole lid 10 that can be opened using the hole lid opening / closing jig 100 according to an embodiment.

[0011] 1 and 2, the z direction is the vertical direction, the x direction is a first horizontal direction perpendicular to the z direction, and the y direction is a second horizontal direction perpendicular to the z and x directions.

[0012] As shown in Fig. 1, the hole cover opening / closing jig 100 of this embodiment includes a lifting hook 110, a base 120, a lifting arm 130, and a handle 140. As shown in Fig. 2, the hole cover 10 covers a hole H10 that communicates between an underground space provided below the ground level GR and the ground. The hole H10 is, for example, a manhole or a handhole, and the hole cover 10 is, for example, a manhole cover or a handhole cover. The hole cover opening / closing jig 100 (see Fig. 1) is used when lifting and opening the hole cover 10 (see Fig. 2) that covers the hole H10.

[0013] In this embodiment, the hole cover opening / closing jig 100 is configured so that the hanging hook 110, the base 120, the lifting arm 130, and the handle 140 are all detachable.

[0014] As will be described in detail later, in the hole lid opening / closing jig 100, the lifting hook 110 and the lifting arm 130 are detachable, and the lifting hook 110 and the lifting arm 130 are connected using a hook connecting pin P132. Also, in the hole lid opening / closing jig 100, the base 120 and the lifting arm 130 are detachable, and the base 120 and the lifting arm 130 are connected using an arm connecting pin P120. Furthermore, in the hole lid opening / closing jig 100, the lifting arm 130 and the handle 140 are detachable, and the lifting arm 130 and the handle 140 are connected using a handle connecting pin P133. When the hole lid opening / closing jig 100 is assembled, the hook connecting pin P132, the arm connecting pin P120, and the handle connecting pin P133 are fixed using, for example, a split pin (not shown) to prevent them from falling off.

[0015] Each part constituting the hole cover opening / closing jig 100 is formed using, for example, a metal material (aluminum, etc.).

[0016] Each part constituting the hole cover opening / closing jig 100 will be explained in order.

[0017] [A-1] Hanging hook 110 In the hole cover opening / closing jig 100, the hanging hook 110 is engaged with the hole cover 10 when the hole cover 10 is lifted and opened (see FIGS. 1 and 2).

[0018] 3 is a side view schematically showing the hanging hook 110 in the hole cover opening / closing jig 100 according to the embodiment. In FIG. 3, the hanging hook 110 is shown detached from the hole cover opening / closing jig 100.

[0019] As shown in FIG. 3, the hanging hook 110 includes a hanging hook main body 111, a hook connecting pin engaging portion 112, and a hole cover engaging portion 113.

[0020] [A-1-1] Hanging hook body 111 In the hanging hook 110, the hanging hook main body 111 is a plate-like body that extends linearly.

[0021] [A-1-2] Hook connecting pin engagement part 112 In the hoisting hook 110, the hook connecting pin engaging portion 112 is provided at one end of the hoisting hook main body 111, and is configured to engage with the hook connecting pin P132 (see FIG. 1).

[0022] [A-1-3] Hole cover engagement part 113 In the hanging hook 110, the hole lid engaging portion 113 is provided at the other end of the hanging hook main body 111 and is configured to engage with the hole lid 10. Here, the hole lid engaging portion 113 engages with the hole lid engaging rod 11 (see FIG. 2) provided inside the trench T11 in the hole lid 10.

[0023] In this embodiment, the tip surface of the hole lid engaging portion 113 is configured to be inclined at an angle of 60° or more and 80° or less with respect to the extension direction of the hanging hook main body 111. In other words, the angle K at which the tip surface of the hole lid engaging portion 113 is inclined with respect to the extension direction of the hanging hook main body 111 is 60° or more and 80° or less.

[0024] [A-2] Base 120 In the hole cover opening / closing jig 100, the base 120 is placed on the ground GR located around the hole cover 10 when the hole cover 10 is lifted and opened (see FIGS. 1 and 2).

[0025] Figures 4A and 4B are side views schematically showing the base 120 in the hole lid opening / closing jig 100 according to the embodiment. Figures 4A and 4B show a state in which the base 120 has been detached from the hole lid opening / closing jig 100. Figure 4A shows the yz plane (vertical plane), and Figure 4B shows the xy plane (horizontal plane).

[0026] As shown in FIGS. 4A and 4B, the base 120 includes a base support plate portion 121 and a base bearing portion 122.

[0027] [A-2-1] Base support plate portion 121 Of the base 120, the base support plate portion 121 is, for example, a plate-like body, and is placed on the ground GR.

[0028] [A-2-2] Base bearing part 122 The base bearing portions 122 of the base 120 are a pair of plate-like bodies. The pair of base bearing portions 122 face each other across a gap on the upper surface of the base support plate portion 121 and are fixed to the upper surface of the base support plate portion 121.

[0029] An arm connecting pin insertion hole H120 is formed in each of the pair of base bearing portions 122. An arm connecting pin P120 is inserted into the arm connecting pin insertion hole H120. The arm connecting pin P120 is connected to one of the base bearing portions 122 via a chain C120 to prevent it from being lost.

[0030] In this embodiment, the arm connecting pin insertion hole H120 is an elongated hole whose longitudinal direction follows the ground surface GR when the base 120 is placed on the ground surface GR (see FIG. 1). Although not shown, the portion of the base bearing part 122 where the arm connecting pin insertion hole H120 is formed is made of a metal material that is harder than other portions in order to ensure durability.

[0031] [A-3] Lifting arm 130 In the hole cover opening / closing jig 100, when the hole cover 10 is lifted and opened, the lifting arm 130 has a lifting hook 110 rotatably attached to one end thereof, and the other end thereof is rotatably supported by the base 120 (see Figures 1 and 2).

[0032] Figures 5A and 5B are side views schematically showing the lifting arm 130 in the hole cover opening / closing jig 100 according to the embodiment. Figures 5A and 5B show a state in which the lifting arm 130 has been detached from the hole cover opening / closing jig 100. Figure 5A shows the yz plane (vertical plane), and Figure 5B shows the xy plane (horizontal plane).

[0033] As shown in FIGS. 5A and 5B, the lifting arm 130 includes a lifting arm main body 131, a lifting hook support portion 132, a handle support portion 133, and an arm connecting pin insertion portion 134.

[0034] [A-3-1] Lifting arm body 131 The lifting arm main body 131 of the lifting arm 130 is configured to include a portion that protrudes from the side of the base 120 when the lifting arm 130 is connected to the base 120 .

[0035] [A-3-2] Hanging hook support part 132 Of the lifting arm 130, the lifting hook support portion 132 is a pair of plate-shaped bodies, and the pair of lifting hook support portions 132 are fixed to one end of the lifting arm main body portion 131 so as to face each other with a gap between them.

[0036] A hook connecting pin insertion hole H132a and a hook connecting pin insertion hole H132b are formed in each of the pair of lifting hook support parts 132. The hook connecting pin insertion hole H132a and the hook connecting pin insertion hole H132b are aligned at a distance from each other on the lifting hook support part 132. A hook connecting pin P132 is inserted into each of the hook connecting pin insertion holes H132a and H132b. The hook connecting pin P132 is connected to the lifting arm main body part 131 via a chain C132 to prevent it from being lost.

[0037] The lifting hook 110 is engaged with the hook connecting pin P132 between the pair of lifting hook support parts 132. As a result, the lifting arm 130 supports the lifting hook 110 rotatably.

[0038] [A-3-3] Handle support part 133 The handle support part 133 of the lifting arm 130 is, for example, a tubular body. The handle support part 133 is provided on the upper surface of the lifting arm main body part 131 at the other end opposite to the one end where the lifting hook support part 132 is provided. The handle support part 133 is installed so that its pipe axis is perpendicular to the upper surface of the lifting arm main body part 131.

[0039] A handle connecting pin insertion hole H133 is formed in the handle support part 133. A handle connecting pin P133 is inserted into the handle connecting pin insertion hole H133. The handle connecting pin P133 is connected to the handle support part 133 via a chain C133 to prevent it from being lost.

[0040] [A-3-4] Arm connecting pin insertion part 134 Of the lifting arm 130, the arm connecting pin insertion portion 134 is, for example, a tubular body. The arm connecting pin insertion portion 134 is provided on the underside located on the other end side of the lifting arm main body portion 131. The arm connecting pin insertion portion 134 is installed on the underside of the lifting arm main body portion 131 so that its pipe axis is aligned with the underside.

[0041] The arm connecting pin insertion portion 134 includes an arm connecting pin insertion hole H134. The arm connecting pin P120 is inserted into the arm connecting pin insertion hole H134 of the arm connecting pin insertion portion 134, with the arm connecting pin insertion hole H134 communicating with each of a pair of arm connecting pin insertion holes H120 formed in each of the pair of base bearing portions 122 (see FIG. 4). In other words, with the arm connecting pin insertion portion 134 interposed between the pair of base bearing portions 122, the lifting arm 130 is rotatably supported on the base 120 by using the arm connecting pin P120.

[0042] [A-4] Handle 140 In the hole cover opening / closing jig 100, the handle 140 is connected to the lifting arm 130 when the hole cover 10 is lifted and opened.

[0043] 6 is a side view schematically showing the handle 140 of the hole lid opening / closing jig 100 according to the embodiment. In FIG. 6, the handle 140 is shown detached from the hole lid opening / closing jig 100.

[0044] 6, the handle 140 includes a handle component 141 and a handle component 142. The handle component 141 and the handle component 142 are detachable from each other.

[0045] [A-4-1] Handle component 141 In the handle 140 , the handle component 141 includes a shaft portion 1411 and a head portion 1412 .

[0046] The shaft portion 1411 is, for example, a cylindrical rod-like body that is solid and does not include any internal space, and has a handle component connecting pin insertion hole H141 formed on the lower end side. The handle component connecting pin insertion hole H141 is formed to penetrate the shaft portion 1411 in a direction perpendicular to the axial direction.

[0047] The head portion 1412 is, for example, a cylindrical rod-like body that is solid and does not include any internal space. The head portion 1412 is provided on the upper end side of the shaft portion 1411 and corresponds to the tip portion of the handle 140. The head portion 1412 has a larger diameter than the shaft portion 1411.

[0048] [A-4-2] Handle component 142 Of the handle 140, the handle component 142 is, for example, a cylindrical tubular body that includes a space inside. The handle component 142 has a handle component connecting pin insertion hole H142a formed on the upper end side and a handle connecting pin insertion hole H142b formed on the lower end side.

[0049] The handle component connecting pin P140 is inserted into the handle component connecting pin insertion hole H142a of the handle component 142 while the handle component connecting pin insertion hole H141 of the handle component 141 is in communication with the handle component connecting pin insertion hole H142a (see FIG. 1). This connects the handle component 141 and the handle component 142. The handle component connecting pin P140 is connected to the handle component 142 via a chain C140 to prevent it from being lost.

[0050] The handle connecting pin P133 is inserted into the handle connecting pin insertion hole H142b of the handle component 142 while the handle connecting pin insertion hole H133 of the lifting arm 130 is in communication with the handle connecting pin insertion hole H142b (see FIG. 1), thereby connecting the handle 140 and the lifting arm 130.

[0051] [B] How to open and close the hole cover A method for opening the hole lid 10 (FIG. 2) using the hole lid opening / closing jig 100 (FIG. 1) of this embodiment will be described.

[0052] [B-1] Engagement of the hanging hook 110 When opening the hole cover 10 (FIG. 2), the hanging hook 110 is first engaged with the hole cover 10.

[0053] 7A to 7E are side views schematically showing how the hanging hook 110 of the hole cover opening / closing jig 100 is engaged with the hole cover 10 in the embodiment. 7A to 7E sequentially show the procedure for engaging the hanging hook 110 with the hole cover 10.

[0054] When engaging the hanging hook 110 with the hole lid 10, the hanging hook 110 is prepared on the upper surface of the hole lid 10 as shown in Fig. 7A. In this embodiment, the tip surface of the hole lid engaging portion 113 of the hanging hook 110 is configured to be inclined at an angle of 60° or more and 80° or less with respect to the extension direction of the hanging hook main body 111 (see Fig. 3). Therefore, the hanging hook 110 can be placed on the upper surface of the hole lid 10 so that the tip surface of the hole lid engaging portion 113 is aligned substantially along the vertical direction z (the direction perpendicular to the ground).

[0055] Next, as shown in FIG. 7B , the hole cover engaging portion 113 of the hanging hook 110 is inserted into the trench T11 in which the hole cover engaging rod 11 is provided in the hole cover 10. If foreign matter such as soil or sand is present inside the trench T11, the head portion 1412 of the handle component 141 can be used as a hammer to strike the hole cover 10, as necessary, to remove the foreign matter. The hole cover engaging portion 113 of the hanging hook 110 can also be used to remove the foreign matter. In this embodiment, the hanging hook 110 can be placed on the top surface of the hole cover 10 so that the tip surface of the hole cover engaging portion 113 is aligned substantially along the vertical direction z (the direction perpendicular to the ground), thereby enabling the work of removing foreign matter to be performed efficiently. In addition, the head portion 1412 of the handle component 141 may be used as a hammer to strike the hole cover 10 to remove foreign matter such as soil and sand that has accumulated in the gap between the outer surface of the hole cover 10 and the inner surface of the hole H10.

[0056] Next, as shown sequentially in Figures 7C to 7E, with the hole cover engagement portion 113 of the hanging hook 110 engaged with the hole cover engagement rod 11 of the hole cover 10, the orientation of the hanging hook 110 is changed so that the hook connecting pin engagement portion 112 is positioned above the hole cover engagement portion 113.

[0057] Thereafter, although not shown, the hook connecting pin engaging portion 112 of the lifting hook 110 is engaged with the hook connecting pin P132. Here, the hook connecting pin P132 is inserted into either the hook connecting pin insertion hole H132a or the hook connecting pin insertion hole H132b formed in the lifting arm 130, taking into consideration the positional relationship between the lifting arm 130 and the lifting hook 110 engaged with the hole cover engaging rod 11. For example, as can be seen from FIG. 1, the hook connecting pin P132 is inserted into the hook connecting pin insertion hole H132a, and the hook connecting pin engaging portion 112 of the lifting hook 110 engages with the inserted hook connecting pin P132.

[0058] FIG. 7F is a side view that schematically shows how the hanging hook 110x of the comparative example is engaged with the hole cover 10. As shown in FIG.

[0059] 7F, the suspending hook 110x of the comparative example is, for example, an eye hook. In this case, the suspending hook 110x comes into contact with the hole cover 10, making it difficult to insert the tip of the suspending hook 110x into the trench T11 of the hole cover 10. As a result, it is not easy to remove foreign matter such as soil and sand from the inside of the trench T11.

[0060] [B-2] Operation of handle 140 As described above, after the engagement of the hanging hook 110 is completed, the hole cover 10 is opened by operating the handle 140.

[0061] FIG. 8A is a side view that schematically shows a state in which the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100 of the embodiment.

[0062] As shown in Fig. 8A, in this embodiment, the handle 140 is operated to rotate the lifting arm 130. Here, the handle 140 is operated so that the tip of the handle 140 moves away from the hall lid 10. This causes the end of the lifting arm 130, on which the lifting hook 110 is installed, to rotate upward, with the arm connecting pin P120 as the rotation axis. As a result, the hall lid 10, which is engaged with the lifting hook 110, is lifted upward and opened by the principle of leverage.

[0063] In the hall cover opening / closing jig 100 of this embodiment, an arm connecting pin P120 for rotatably supporting the lifting arm 130 on the base 120 is inserted into an arm connecting pin insertion hole H120 of the base 120. The arm connecting pin insertion hole H120 is an elongated hole whose longitudinal direction follows the ground surface GR when the base 120 is placed on the ground surface GR. Therefore, when the hall cover 10 is opened, the arm connecting pin P120, which functions as a fulcrum, moves in the arm connecting pin insertion hole H120 so as to approach the side of the hall cover 10, as shown in FIG. 8A.

[0064] As a result, in this embodiment, the hook connecting pin P132 with which the hanging hook 110 is engaged moves upward in the vertical direction without moving horizontally. That is, the horizontal position of the hook connecting pin P132, which functions as the fulcrum of the hanging hook 110, is approximately the same before and after opening the hole lid 10. Therefore, in this embodiment, the horizontal force (lateral load) caused by the open hole lid 10 does not act on the base 120 of the hole lid opening / closing jig 100, and therefore the base 120 does not move when the hole lid 10 is opened.

[0065] Therefore, by using the hole cover opening / closing jig 100 of this embodiment, the opening operation of the hole cover 10 can be performed stably.

[0066] FIG. 8B is a side view that schematically shows how the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100x of the comparative example.

[0067] As shown in Fig. 8B, in the hole lid opening / closing jig 100x of the comparative example, an arm connecting pin P120 for rotatably supporting the lifting arm 130 on the base 120 is inserted into an arm connecting pin insertion hole H120x of the base 120. Unlike the arm connecting pin insertion hole H120 of the hole lid opening / closing jig 100 of this embodiment, the arm connecting pin insertion hole H120x of the hole lid opening / closing jig 100x of the comparative example is not an elongated hole. Therefore, when the hole lid 10 is opened, the arm connecting pin P120 which functions as a fulcrum does not move in the arm connecting pin insertion hole H120, as shown in Fig. 8B.

[0068] As a result, in the comparative example, the hook connecting pin P132 to which the hanging hook 110 is engaged rotates around the arm connecting pin P120 as a rotation axis in the same way as the hanging hook 110, and therefore moves in the horizontal and vertical directions. That is, in the comparative example, the hook connecting pin P132 that functions as a fulcrum for the hanging hook 110 has a different horizontal position before and after the hole lid 10 is opened. Therefore, in the comparative example, a horizontal force (lateral load) caused by the open hole lid 10 acts on the base 120 of the hole lid opening / closing jig 100, and there is a possibility that the base 120 will move toward the hole lid 10 during the operation of opening the hole lid 10.

[0069] Therefore, when the hole cover opening / closing jig 100x of the comparative example is used, it is more difficult to stably perform the opening operation of the hole cover 10 than in the case of this embodiment.

[0070] Fig. 9A is a side view schematically showing how the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100 of the embodiment. Fig. 9B is a side view schematically showing how the hole lid 10 is opened by operating the handle 140 in the hole lid opening / closing jig 100x of the comparative example.

[0071] 9A and 9B show a case (case 2) in which, unlike the case (case 1) in Figures 8A and 8B, a ring member 10a protruding upward is present on the surface supporting the hole lid 10. In this case, when opening the hole lid 10, the edge of the hole lid 10 may get caught on the ring member 10a.

[0072] 9B, in the hole lid opening / closing jig 100x of the comparative example, as described above, the position of the hook connecting pin P132 in the horizontal direction is different before and after opening the hole lid 10. Therefore, in the comparative example, a horizontal force (lateral load) caused by the hole lid 10 hooked on the ring member 10a acts on the base 120 of the hole lid opening / closing jig 100, and there is a possibility that the base 120 will move toward the hole lid 10 during the operation of opening the hole lid 10.

[0073] 9A, in the hole lid opening / closing jig 100 of this embodiment, as described above, the position of the hook connecting pin P132 in the horizontal direction is the same before and after opening the hole lid 10. Therefore, even if the edge of the hole lid 10 is caught on the ring member 10a, the horizontal force (lateral load) of the hole lid 10 caught on the ring member 10a does not act on the base 120 of the hole lid opening / closing jig 100, thereby reducing the possibility that the base 120 will move toward the hole lid 10 when opening the hole lid 10.

[0074] Therefore, by using the hole cover opening / closing jig 100 of this embodiment, the opening operation of the hole cover 10 can be performed stably.

[0075] [C] Summary As described above, in the hall cover opening / closing jig 100 of this embodiment, the base 120 includes the arm connecting pin insertion hole H120 into which the arm connecting pin P120 is inserted. The arm connecting pin insertion hole H120 is an elongated hole whose longitudinal direction follows the ground surface GR when the base 120 is placed on the ground surface GR, and when the hall cover 10 is opened, the arm connecting pin P120 moves in the arm connecting pin insertion hole H120 so as to approach the side of the hall cover 10. Therefore, as described above, according to the hall cover opening / closing jig 100 of this embodiment, the operation of opening the hall cover 10 can be performed stably.

[0076] In the hole lid opening / closing jig 100 of this embodiment, the handle 140 includes a plurality of handle components 141, 142 that are detachable from one another. Also, the hanging hook 110, the base 120, the lifting arm 130, and the handle 140 are all detachable from one another. Therefore, the hole lid opening / closing jig 100 of this embodiment is highly portable and allows the hole lid 10 to be easily opened.

[0077] In the hole cover opening / closing jig 100 of this embodiment, the handle 140 has a solid tip. Therefore, in this embodiment, the solid tip can be used as a hammer to strike the hole cover 10, thereby performing the task of removing foreign matter such as soil and sand from the hole cover 10. As a result, the task of opening the hole cover 10 can be performed efficiently.

[0078] In the hole cover opening / closing jig 100 of this embodiment, the hanging hook 110 is configured so that the tip surface of the hole cover engaging portion 113 is inclined at an angle of 60° or more and 80° or less with respect to the extension direction of the hanging hook main body portion 111. Therefore, in this embodiment, the work of removing foreign matter such as soil and sand from the hole cover 10 can be easily performed, and the work of opening the hole cover 10 can be performed efficiently.

[0079] <Other> Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0080] 10: hole lid, 10a: ring member, 11: hole lid engaging rod, 100: hole lid opening / closing jig, 100x: hole lid opening / closing jig, 110: hanging hook, 110x: hanging hook, 111: hanging hook main body, 112: hook connecting pin engaging portion, 113: hole lid engaging portion, C120: chain, 120: base, 121: base support plate portion, 122: base bearing portion, 130: lifting arm, 131: lifting arm main body, C132: chain, 132: hanging hook support portion, C133: chain, 133: handle support portion, 134: arm connecting pin insertion portion, C140: chain, 140: handle, 141: handle configuration Component, 142: Handle component, 1411: Shaft, 1412: Head, H10: Hole, H120: Arm connecting pin insertion hole, H120x: Arm connecting pin insertion hole, H132a: Hook connecting pin insertion hole, H132b: Hook connecting pin insertion hole, H133: Handle connecting pin insertion hole, H134: Arm connecting pin insertion hole, H141: Handle component connecting pin insertion hole, H142a: Handle component connecting pin insertion hole, H142b: Handle connecting pin insertion hole, P120: Arm connecting pin, P132: Hook connecting pin, P133: Handle connecting pin, P140: Handle component connecting pin, T11: Trench

Claims

1. a hanging hook to be engaged with a hole cover that closes a hole that is connected to an underground space provided underground; A base placed on the ground around the hole cover; a lifting arm having one end to which the lifting hook is rotatably attached and the other end to which the base is rotatably supported; a handle connected to the lifting arm; Equipped with A hole cover opening / closing jig that operates the handle and rotates the lifting arm to lift and open the hole cover engaged with the lifting hook by the principle of leverage, An arm connecting pin for rotatably supporting the lifting arm on the base and The base is Arm connecting pin insertion hole into which the arm connecting pin is inserted Including, the arm connecting pin insertion hole is an elongated hole whose longitudinal direction is along the ground when the base is placed on the ground, When the hole cover is opened, the arm connecting pin moves toward the hole cover in the arm connecting pin insertion hole. Hole cover opening and closing jig.

2. The handle is Multiple handle components that are detachable from one another Including, The hole cover opening and closing jig according to claim 1.

3. The lifting hook, the base, the lifting arm and the handle are each detachable. The hole cover opening and closing jig according to claim 1.

4. The handle has a solid tip. The hole cover opening and closing jig according to claim 1.

5. A hook connecting pin for rotatably supporting the lifting hook on the lifting arm and The lifting arm has a hook connecting pin insertion hole into which the hook connecting pin is inserted. Including, The hanging hook is a linearly extending suspension hook body; a hook connecting pin engaging portion provided at one end of the hanging hook body portion and engaged with the hook connecting pin; a hole cover engaging portion provided at the other end of the hanging hook body portion and engaged with the hole cover; Including, The hole cover opening and closing jig according to claim 1.

6. The hanging hook is configured such that the tip surface of the hole cover engaging portion is inclined at an angle of 60° or more and 80° or less with respect to the extension direction of the hanging hook main body portion. The hole cover opening and closing jig according to claim 5.

7. The hole cover is opened using the hole cover opening / closing jig according to any one of claims 1 to 6. How to open and close the hole cover.

Images