JP2023110756A - Manhole cover opening/closing assisting tool, and manhole cover structure - Google Patents

Abstract

To provide a manhole cover opening/closing assisting tool capable of enhancing crime prevention performance of a manhole cover, and a manhole cover structure having high crime prevention performance.SOLUTION: An opening/closing assisting tool for assisting an opening/closing operation of a manhole cover structure comprises: a lock connection portion configured to be connected to a lock main body from an upper surface side of the cover so that a position of the lock main body can be switched; and a tool connection portion configured to enable an opening/closing tool be connected in a state where the lock connection portion is connected to the lock main body in an unlocked position so that the opening/closing operation of the cover can be performed using the opening/closing tool for opening/closing the cover with respect to a frame body.SELECTED DRAWING: Figure 30

Description

The present invention relates to a manhole cover opening and closing aid and a manhole cover structure.

Patent Literature 1 discloses an underground structure lid as a manhole. This underground structure lid includes a support frame 2, a main lid body 3 connected to the support frame 2 by a hinge structure 7 so as to be openable and closable, and having a prying hole and a burr hole arranged on the outer circumference, the support frame 2 and the main lid body 3. and a locking lid structure 9 disposed between. The lock lid structure 9 includes a locking portion projecting from the receiving frame 2 and a lock body provided horizontally rotatably on the main lid body 3 and engaged with the locking portion.

Then, the lock main body is horizontally rotated to unlock, a tool is inserted into the crowbar hole, and the cover main body is lifted and rotated horizontally to open the crowbar hole, and a predetermined work (in patent document 1, valve replacement, etc. is performed). is described).

When the predetermined work is completed, a tool is inserted into the crowbar hole and the lid body is horizontally rotated in the reverse direction to attach it to the receiving frame.

JP-A-10-266249

However, in the example shown in Patent Document 1, there is a possibility that the locking of the lock body may be lost and left unlocked when the parent lid body is attached to the receiving frame after the predetermined work is completed. In this case, the underground structure will be insufficient for crime prevention as a manhole that can be locked.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a manhole cover opening/closing aid capable of enhancing the crime prevention performance of a manhole cover, and a manhole cover structure having a high crime prevention performance.

The present invention comprises a frame buried in the ground and forming an opening communicating between the ground and the ground, a lid fitted in the frame and capable of closing the opening of the frame, and an opening of the frame. a locking mechanism capable of locking and unlocking the closed lid, the locking mechanism being provided on the lid and capable of switching between a locked position and an unlocked position; and the frame body provided in a manhole cover structure for assisting the opening and closing operation of the cover in a manhole cover structure having a lock engaging portion that engages with the lock body portion in the locked position to lock the cover so that the cover cannot be opened a lock connecting portion configured to be connectable to the lock main body portion from the upper surface side of the lid so that the position of the lock main body portion can be switched; The opening/closing tool is configured to be connectable with the lock connecting portion connected to the lock main body portion at the unlocked position so that the opening/closing operation of the lid can be performed using the opening/closing tool for opening/closing the lid. and a tool connection.

The manhole cover opening and closing aid of the present invention comprises a lock connecting portion and a tool connecting portion, and the lock connecting portion is arranged to be able to switch the position of the lock body from the upper surface side of the lid. The tool connecting portion is configured to be connectable to the lock main body at the unlocked position so that the lid can be opened and closed using an opening and closing tool for opening and closing the lid with respect to the frame. The opening/closing tool is configured to be connectable in a state of being connected to the part. For this reason, the opening/closing aid is connected to the lock main body and unlocked, and the opening/closing tool is connected to the opening/closing aid in that state to perform the opening/closing operation of the lid. Therefore, after closing the lid, the user's attention goes to the opening/closing aid without forgetting to lock the lid, thereby enhancing security.

In the present invention, the lock connecting portion is configured to be detachably connected to the lock body portion in the locked position and to be unremovably connected to the lock body portion in the unlocked position. good too.

In the manhole cover opening/closing aid of the present invention, the lock connecting portion is detachably connected to the lock main body in the locked position and is irremovably connected to the lock main body in the unlocked position. Therefore, the opening and closing operation of the lid is facilitated by using the opening and closing aid.

In the present invention, the lock connecting portion is configured to be inserted downward from the upper surface of the lid and connected to the lock main body, and the tool connecting portion is configured so that the lock connecting portion is connected to the lock main body. It may be configured to protrude upward from the upper surface of the lid in a connected state.

In the manhole cover opening/closing aid of the present invention, the tool connecting portion protrudes upward from the upper surface of the lid while the lock connecting portion is connected to the lock main body, so that the tool connecting portion protrudes when the lid is opened and closed. It becomes easy to check the tool connection part, and it is possible to effectively suppress forgetting to lock.

In the present invention, the lid is configured to be disengaged from the frame body by being operated to move in a predetermined disengagement direction using the opening/closing tool, and the tool connecting portion is configured to be disengaged from the frame body in a predetermined locking direction. When the lock main body portion connected to the lock connecting portion is positioned at the unlocked position, the locking direction is aligned with the disengagement direction, and the lock body is at the locked position. In the positioned state, the locking direction may be a direction other than the detachment direction.

In the manhole cover opening/closing aid of the present invention, it is possible to determine whether the manhole is locked or unlocked depending on the orientation of the tool connecting portion.

The present invention comprises a frame buried in the ground and forming an opening communicating between the ground and the ground, a lid fitted in the frame and capable of closing the opening of the frame, and an opening of the frame. a locking mechanism capable of locking and unlocking the closed lid, the locking mechanism being provided on the lid and capable of switching between a locked position and an unlocked position; and the frame a lock engaging portion provided on a body for engaging with the lock main body portion in the locked position to lock the lid so as not to open; The manhole cover structure capable of opening and closing the cover using a manhole cover, wherein the opening and closing tool is directly attached to the cover in order to lift and open and close the cover fitted in the frame. There is no open/close engaging portion for engaging with the lid.

In the manhole cover structure of the present invention, the opening/closing operation of the cover is limited to the opening/closing operation using the opening/closing aid and the opening/closing tool. Therefore, high security is obtained.

The present invention further includes a hinge portion that connects the lid and the frame so that they can be opened and closed, and the lid includes an edge cutting insertion portion into which the opening/closing tool is inserted to cut edges between the lid and the frame. and the edge cutting insertion portion and the hinge portion may be arranged to face each other across a central portion of the lid in a radial direction of the lid.

In the manhole cover structure of the present invention, the edge cutting insertion portion is arranged at the position where the opening/closing locking portion is normally provided, so that the edge of the lid and the frame can be easily cut off, and the hinge portion can be Since it is possible to prevent the opening and closing operation of the door from being done by mischief, crime prevention is enhanced.

The manhole cover opening/closing aid of the present invention can enhance the crime prevention performance of the manhole cover, and the manhole cover structure of the present invention can enhance the crime prevention performance.

1 is a plan view of a manhole cover structure that represents one embodiment of the present invention; FIG. It is a partial cross-sectional view of the same frame and lid. It is a bottom view of the lid. It is a sectional view of the lid. It is a front view of the same opening-and-closing tool. It is a side view of the same opening-and-closing tool. It is a partial sectional view of the same frame and a hinge. It is a cross-sectional view of the lock body portion of the locking mechanism. It is a bottom view of the lock main-body part of the same locking mechanism. It is a top view of only the lock main-body part of the same locking mechanism. Fig. 4 is a cross-sectional view of an adjusting screw and a flange member of the lock body of the locking mechanism; It is a top view of the adjusting screw of the lock main-body part of the same locking mechanism, and a flange material. It is a top view of the flange material of the same locking mechanism. It is a front view of the same opening-and-closing assistance tool. It is a side view of the same opening-and-closing assistance tool. It is a top view of the same opening-and-closing assistance tool. It is a bottom view showing a lock connection part among the same opening-and-closing aids. It is the top view which cut|disconnected the tool connection part among the same opening-and-closing assistance tools. It is the top view which cut|disconnected the intermediate|middle part among the same opening-and-closing assistance tools. It is an enlarged plan view which shows the whole locking hole part. 20. It is sectional drawing which shows the whole locking hole part, and is the II sectional arrow view in FIG. 20. It is sectional drawing from the other direction of the same locking hole part, and is sectional drawing from the II direction in FIG. 21 is a cross-sectional view of the locking hole from still another direction, and is a cross-sectional view taken along line III-III in FIG. 20. FIG. It is an enlarged bottom view which shows the whole locking hole part. 21. It is a top view showing the 2nd through-hole of the same locking hole part, and is a XX cross-sectional arrow directional view in FIG. FIG. 21 is a plan view showing a third through hole of the locking hole portion, and is a cross-sectional view taken along line YY in FIG. 21; FIG. 22 is a plan view showing a fourth through hole and a fifth through hole of the same locking hole portion, and is a cross-sectional view taken along line ZZ in FIG. 21; It is a bottom view showing the locking position of the same locking mechanism. It is a cross-sectional view showing the locking position of the locking mechanism, and a cross-sectional view of a state in which the opening and closing aid is attached. It is a cross-sectional view showing the unlocked position of the locking mechanism, and is a cross-sectional view of a state in which the opening and closing aid is attached. It is a front view of the opening-and-closing aid of another embodiment. It is a front view of the opening-and-closing assistance tool of 2nd embodiment. It is a side view of the same opening-and-closing assistance tool. It is a top view of the same opening-and-closing assistance tool. It is a bottom view showing a lock connection part among the same opening-and-closing aids. It is the top view which cut|disconnected the intermediate|middle part among the same opening-and-closing assistance tools.

Hereinafter, a manhole cover structure showing an embodiment of the present invention will be described. Manholes, which are underground structures, are opened in the ground so that workers can enter and exit from the ground for the purpose of management (inspection, repair, cleaning, exhaust, etc.) of underground sewers, culverts, and buried electrical and communication cables. The cover structure of the present invention, as the manhole, closes the opening of the vertical hole on the ground surface.

As shown in FIGS. 1 and 2, a manhole cover structure 1 includes a frame 3 that is embedded in the ground and forms an opening 2 that communicates between the ground and the ground. The frame 3 is a general member, and in this embodiment, the base 4 is arranged on the upper part of the manhole body (not shown) buried in the ground, and the base 4 is erected on the inner peripheral surface of the base 4. It is composed of a cradle 5 and a cradle 5. The frame 3 is circular in plan view.

A receiving frame 7 projecting from the inner periphery toward the center of the receiving table 5 is arranged in the middle of the inner periphery of the receiving table 5 in the vertical direction. The opening 2 is located in the upper portion of the cradle 5 and inside the cradle 5, and the inner peripheral surface of the cradle 5 is formed as an inclined surface 5a whose diameter is reduced downward. The receiving frame 7 protrudes from the inclined surface 5a toward the center side, and serves as a lock engaging portion with which a lock main body portion 19, which will be described later, engages. The lock main body 19 engages with the receiving frame 7 in the vertical direction. Note that the lower surface 7a of the receiving frame 7 is oriented horizontally.

The manhole is provided with a lid 10 that can be fitted into the frame 3 to close the opening 2 of the frame 3 (receiving frame 7). The lid 10 has a circular shape in plan view so as to be able to close the opening 2 . As shown in FIG. 2, a rim 11 is formed on the outer periphery of the lid 10 so as to be fitted into the receiving frame 7 from above. The outer peripheral surface of the rim 11 is formed as an inclined surface so as to follow the inclined surface 5a. Further, ribs 12 are formed vertically and horizontally on the lower surface of the lid 10 as shown in FIGS.

As shown in FIGS. 1 and 3, burr holes 13 are formed at predetermined intervals (120° in this embodiment) on the outer periphery of the lid 10 . The crowbar hole 13 is used as a hole for prying the lid 10 against the frame 3 at the base end portion 17 of the opening/closing tool 16 (crowbar) shown in FIGS. That is, the burr hole 13 is provided in the lid 10 and configured as an edge cutting insertion portion into which the opening/closing tool 16 is inserted to cut the edge between the lid 10 and the frame body 3 . Each burr hole 13 is widened downward in the height direction so that the base end portion 17 of the opening/closing tool 16 can twist the lid 10 .

In the lid 10, a hinge support mechanism 18 as shown in FIG. The hinge support mechanism 18 is formed to protrude downward from the back surface of the lid 10 . The hinge support mechanism 18 is provided with a hinge 20, that is, a hinge portion, which can rotate around the horizontal shaft 18a. Further, a hinge receiving portion 21 is protruded on the back side of the hinge support mechanism 18 and midway in the vertical direction of the receiving base 5 .

The lid 10 can be vertically opened and closed with respect to the frame 3 by sliding the hinge 20 in a hinge hole 22 formed inside the hinge receiving portion 21, and the lid 10 can be opened and closed around the hinge 20. It is configured to be rotatable in a substantially horizontal direction. That is, the hinge 20 connects the lid 10 and the frame 3 so that the lid 10 can be vertically opened and closed with respect to the frame 3 and can be rotated horizontally.

As shown in FIG. 3, the burl holes 13 other than the adjacent burl holes 13, which are called specific burl holes 14, have the same structure as the other burl holes 13. As shown in FIG. The specific bar hole 14 is positioned in the circumferential direction of the lid 10 at a position corresponding to the hinge support mechanism 18 in which the hinge 20 as the hinge portion is arranged. That is, the specific burr hole 14 is arranged opposite to the hinge 20 through the central portion of the lid 10 in the radial direction of the lid 10, and is arranged apart from the hinge 20 by 180° in the circumferential direction of the lid 10 in plan view. there is

The configuration of the opening/closing tool 16 to be inserted into the burl hole 13 (burl holes 13 and 14) will be described with reference to FIGS. 5 and 6. FIG. Since the opening/closing tool 16 is composed of general members, its outline will be described. The opening/closing tool 16 includes a rod-shaped tool body 23, the base end portion 17 of the tool body 23, the front end portion 24 of the tool body 23, and a handle disposed in the middle of the rod shape of the tool body 23. 25.

The base end portion 17 of the tool body 23 is formed with a diameter smaller than that of the tool body 23 so as to be inserted corresponding to the wide shape of the burl hole 13 . A front end portion 24 of the tool body 23 has a T shape that is inclined from the central axis of the tool body 23 toward the front end. 26 and a wide portion 27 formed perpendicular to the mounting portion 26 .

The wide portions 27 protrude in the radial direction of the tool main body 23 , and project from a pair of, more specifically, the mounting portions 26 in opposite directions so as to face each other with respect to the central axis. The tool body 23 side (base end side) of the wide portion 27 has a tapered shape that tapers from the front end side toward the base end side, and the tapered shape intersects the central axis of the mounting portion 26. It consists of the plane part 28 so that it may become a plane, and the plane part 28 is formed in a pair. The handle 25 is parallel to both wide portions 27 (flat portions 28), is arranged on the front end portion 24 side of the tool body 23, and has a circular cross-sectional shape.

As shown in FIG. 2 , the manhole cover structure 1 is provided with a locking mechanism 29 . The locking mechanism 29 has a mechanism portion arranged on the cradle 5 side and a mechanism portion arranged on the lid 10 side. Specifically, the locking mechanism 29 includes the receiving frame 7 protruding from the receiving table 5 as a mechanism portion arranged on the receiving table 5 side. Further, a lock body portion 19, a lock mounting portion 31, and a lock biasing portion S are provided as mechanical portions arranged on the lid 10 side.

The locking mechanism 29 as a whole (with the receiving frame 7 fixed) has a locking position F1 at which the lid 10 is prevented from opening and an unlocking position F2 at which the lid 10 can be opened. can be switched. Locked position F1 and unlocked position F2 will be described later.

Of the locking mechanism 29, the lock body 19 will be described. As shown in FIG. 8, the lock main body 19 includes a hook main body 8A, an adjusting screw 35 arranged above the hook main body 8A, and a flange member 40 arranged above the adjusting screw 35. As shown in FIG.

The hook body 8A in the lock body portion 19 will be described. The hook main body 8A has a hook portion 8 and a hook 9. As shown in FIG. The hook portion 8 extends vertically and has a cylindrical shape. An upper portion of the hook portion 8 is attached to a lock mounting portion 31, which will be described later, so as to be rotatable in the horizontal direction. A cylindrical space 34 (keyhole) is formed inside the hook portion 8 .

The hook 9 is a member that can be engaged with the receiving frame 7 and locks the lid 10 so that it cannot be opened. The hook 9 is arranged on the lower end side of the hook portion 8 and is a protrusion that protrudes horizontally from the hook portion 8 . A top surface 9a of the hook 9 extends horizontally.
As shown in FIGS. 9, 10, and 28, the circumferential surface of the hook 9 has one circumferential surface 9b along the radial direction around the central axis of the hook portion 8, and the other circumferential surface 9b. The other surface 9c is inclined from the one surface 9b.

The adjusting screw 35 in the lock body 19 will be described. The adjusting screw 35 is arranged at the upper end of the hook body 8A, as shown in FIGS. 11-13. The adjusting screw 35 includes a top plate portion 36 and a cylindrical support portion 37 extending downward from the outer circumference of the top plate portion 36 . A female thread is formed inside the support portion 37 and is screwed to a male thread formed at the upper end portion of the hook body 8A. The bottom edge of the support portion 37 contacts the bottom of the inner flange portion 33 of the lock mounting portion 31 from above, and the hook main body 8A is supported in the hook insertion hole 32 of the lock mounting portion 31. The lock body portion 19 is attached to the lock attachment portion 31 (see FIG. 2). The inner flange portion 33 and the hook insertion hole 32 will be described later. At the center of the top plate portion 36 of the adjusting screw 35, a connection upper hole 39 into which the lock connection portion 38 of the opening/closing aid 45 is inserted is bored. This coupling upper hole 39 is formed as a circular hole.

The flange member 40 in the lock main body portion 19 will be described. The flange member 40 is arranged on the upper end of the hook body 8A so as to overlap the adjusting screw 35 below. The flange member 40 is substantially flush with the upper end of the hook portion 8 and has a substantially rectangular shape in plan view. At the center of this flange member 40, an elliptical pilot connecting hole 41 into which the lock connecting portion 38 can be inserted is formed. The connection pilot hole 41 is configured to be engaged with the lock connection portion 38 in the rotational direction around the vertical direction by vertically inserting the lock connection portion 38 of the opening/closing aid 45 described later. Department.

The lock mounting portion 31 of the locking mechanism 29 will be described. First, as shown in FIG. 1, a locking hole main body 30 is arranged beside the specific burl hole 14 . As shown in FIG. 2, the lock hole main body 30 is formed through the lid 10 in the thickness direction, the lock mounting portion 31 is formed below the lock hole main body 30, and the upper portion of the lock main body portion 19 is It is attached to the lock attachment portion 31 . The lock mounting portion 31 has an inner flange portion 33 that is the bottom wall of the lock hole main body 30 . A hook insertion hole 32 is formed inside the inner flange portion 33 , and a lower hole 60 is formed continuously above the hook insertion hole 32 . The lower hole 60 is formed larger than the hook insertion hole 32 . The upper portion of the lock main body 19 is mounted through the hook insertion hole 32 penetrating the inner flange portion 33 and is also mounted in the lower hole 60 . A contact surface 33 a is formed on the surface of the inner flange portion 33 with which the lower edge of the support portion 37 of the adjustment screw 35 contacts from above.

The lock biasing portion S of the locking mechanism 29 will be described. The lock biasing portion S has a spring 44, one spring seat 42, and the other spring seat 43, as shown in FIG. The spring 44 is set to urge the lock body 19 (hook 8, hook 9) downward. Further, the amount of compression of the spring 44 is changed by screwing the adjustment screw 35 so that the hook 9 can be moved upward or downward. On the other hand, the spring seat 42 is a horizontal surface formed continuously from the hook 9 over the outer periphery of the hook portion 8 . The other spring seat 43 is the bottom surface of the locking hole main body 30 (inner flange portion 33) and is a horizontal surface. Therefore, the spring 44 is arranged at the lower end of the hook portion 8, and the one spring seat 42 and the other spring seat 43 are installed as spring seats.

The locking position F1 and the unlocking position F2 will be described. The hook body 8A can be locked and unlocked with respect to the lid 10 that closes the opening 2 of the frame 3. As shown in FIG. In the hook main body 8A, the locking position F1 (see FIG. 29) is a state in which the hook 9 is arranged below the receiving frame 7, and the lid 10 is in a state where the hook 9 is arranged below the receiving frame 7. can't be opened. At this time, since the upper surface 9a of the hook 9 and the lower surface 7a of the receiving frame 7 abut against each other, the lid 10 cannot be opened. The unlocked position F2 (see FIG. 30) is a state in which the hook 9 is removed from the receiving frame 7, and the lid 10 is in a state in which the hook 9 is removed from the receiving frame 7, so that the lid 10 can be opened and closed in the vertical direction. In addition, it is possible to rotate about the hinge 20 in a substantially horizontal direction.

As shown in FIG. 2 , the locking hole portion 15 is formed inside a locking hole body 30 along the thickness direction of the lid 10 . The locking hole main body 30 is a hollow cylindrical body projecting downward from the upper surface of the lid 10 .

The locking hole main body 30 (locking hole portion 15 ) is arranged beside the specific burr hole 14 and formed to penetrate the lid 10 in the thickness direction, as shown in FIG. 1 . The lateral side of the specific burl hole 14 specifically means the vicinity of the lateral side of the specific burl hole 14 , which is located closer to the center of the lid 10 than the edge of the outer periphery of the lid. The center of the specific burr hole 14 and the center of the locking hole 15 are separated from the center of the lid 10 by a predetermined distance (in this embodiment, the distance is 15 degrees to the right in plan view, but 45 degrees larger than 0 degrees). ° or less). In addition, the center of the locking hole portion 15 is also displaced in the circumferential direction in the radial direction of the lid 10 with respect to the facing direction in which the specific burr hole 14 and the hinge 20 face each other.

Here, the opening/closing assisting tool 45 that can be switched between the locking position F1 and the unlocking position F2 of the lock main body 19 and is inserted into the lock hole main body 30 (lock hole 15) will be described. As shown in FIGS. 14 to 19, when the opening/closing aid 45 is inserted into the lock hole 15 and is inserted into the lock hole 15, the lock connection portion 38, the lid connection portion 46, the intermediary portion 47, and the base portion 48 and a tool connection 49, which are integrally provided from bottom to top.

The lock connecting portion 38 is a member connected to the lock body portion 19 . The lock connecting portion 38 can be connected to the lock main body 19 from the upper surface side of the lid 10 so that the position of the lock main body 19 can be switched, that is, the lock position F1 and the unlocked position F2 can be switched. configured to The horizontal cross section of the lock connecting portion 38 has an elliptical shape (see FIG. 17) corresponding to the elliptical shape of the pilot connecting hole 41 of the lock main body 19 as the auxiliary tool engaging portion. Therefore, by inserting the lock connecting portion 38 into the connecting pilot hole 41 from above, the opening/closing assisting tool 45 and the lock main body portion 19 are connected so as to rotate together.

The lid connecting portion 46 is formed above the lock connecting portion 38 . The horizontal cross section of the lid connecting portion 46 has a long axis that is in the same direction as the short axis of the lock connecting portion 38 and is longer than the short axis, and a short axis that is in the same direction as the long axis of the lock connecting portion 38 and is the same as the long axis. It is elliptical in length (see FIG. 19). The cross section of the lid connecting portion 46 is an elliptical shape perpendicular to the lock connecting portion 38, and the major axis and minor axis of the lid connecting portion 46 are longer than the major and minor axes of the lock connecting portion 38. ing. That is, the lid connecting portion 46 has a shape projecting radially outward from the lock connecting portion 38 . The lid connecting portion 46 also includes a horizontal upper surface 46a and a horizontal lower surface 46b.

The intermediate portion 47 is a member that connects the lid connecting portion 46 and the base portion 48, and has a circular cross section in the horizontal direction. This circular cross section is the same as the minor axis of the lid connecting portion 46 (see FIG. 19).

The base portion 48 is formed above the intermediate portion 47 . The base portion 48 includes a disk member 50 having a bottomed upper portion and an annular member 51 hanging downward from the outer peripheral surface of the disk member 50 . The annular member 51 covers the upper portion of the intermediate portion 47 . A lower surface 51a of the annular member 51 is formed horizontally. In addition, the inner diameter of the annular member 51 is formed to be larger than the outer diameter of the second hole forming member 52, which will be described later.

The tool connecting portion 49 is a member that connects the opening/closing tool 16 . The tool connecting portion 49 protrudes upward from a disc member 50 of the base portion 48 . The tool connecting portions 49 are arranged as a pair along the radial direction of the disk member 50 with a space therebetween (see FIG. 16). The tool connecting portion 49 includes a vertical rod 53 rising from the disk member 50 and a bending body 54 formed at the upper end of the vertical rod 53 and bent from the vertical rod 53 . The bending body 54 has an inclined body 49A inclined from the central axis of the base portion 48, and a key body 49B inclined from one end (upper end) of the inclined body 49A so as to return to the inclined body 49A. Further, opposing inner surfaces 54a of the bending body 54, that is, opposing surfaces of the inclined body 49A and the key body 49B are formed. The flat portion 28 of the opening/closing tool 16 can come into contact with the facing inner surface 54a.

That is, the bending body 54 has a hook shape that is open on one side in the direction intersecting the central axis of the opening/closing assisting tool 45 and is bent or curved so as to protrude toward the other side. The opening/closing tool 16 is connected to the tool connecting portion 49 by the wide portion 27 of 24 entering and engaging with the tool connecting portion 49 .

As shown in plan view FIG. 16, the long axis of the lid connecting portion 46 with respect to the base portion 48 is on both the tool connecting portion 49 sides, and the lock connecting portion 38 is on the tool connecting portion side with respect to the base portion 48. The direction along 49 is the long axis.

Next, the hole shape of the locking hole portion 15 will be described with reference to FIGS. 20 to 27. FIG. The hole shape of the lock hole portion 15 includes an auxiliary tool insertion portion 15A (see FIG. 21) arranged on the upper surface side of the lid 10 and a lock mounting portion 31 arranged on the lower surface side. The upper end of the auxiliary tool inserting portion 15A is open on the upper surface of the lid 10, and an opening/closing auxiliary tool 45 can be inserted downward from above. The lower end of the lock mounting portion 31 is open on the lower surface of the lid 10, and the lock main body portion 19 can be inserted upward from below to be mounted. Further, the lower end of the auxiliary tool insertion portion 15A and the upper end of the lock mounting portion 31 are formed to communicate with each other.

The auxiliary tool insertion portion 15A has a first hole portion 55, a second hole portion 56, a third hole portion 57, a fourth hole portion 58, and a fifth hole portion 59. As shown in FIG. The lock mounting portion 31 has a lower hole 60 which has a hook insertion hole 32 and an inner flange portion 33 . Specifically, as shown in FIG. 20, the locking hole portion 15 is composed of a plurality of types of upper and lower hole regions. As shown in FIG. 21, the hole regions are, in order from the surface side of the lid 10, a first hole portion 55, a second hole portion 56, a third hole portion 57, a fourth hole portion 58, a fifth hole portion 59, and an inner hole portion. It is configured as a flange portion 33 (lower hole 60). These first hole portion 55 , second hole portion 56 , third hole portion 57 , fourth hole portion 58 , fifth hole portion 59 and inner flange portion 33 (lower hole 60 ) are formed using the locking hole main body 30 . formed.

As shown in FIGS. 20 and 23, the upper portion of the first hole portion 55 has a larger diameter, and the lower portion of the first hole portion 55 has a smaller diameter than the upper portion. The upper and lower portions of the first hole portion 55 have areas larger than those of a second hole portion 56, a third hole portion 57, a fourth hole portion 58 and a fifth hole portion 59 described below.

The first through holes 61 formed inside the first hole portion 55 and continuing to the upper and lower portions are both circular in plan view. The diameter of the first through hole 61 is formed to be larger than the diameter of the base portion 48 of the opening/closing aid 45 so that the base portion 48 can be accommodated therein. The lock connecting portion 38, the lid connecting portion 46, the intermediary portion 47, and the base portion 48 of the opening/closing aid 45 are pushed into the first through hole 61 from above. Also, the lower end portion of the tool connecting portion 49 can be pushed in from above.

The second hole portion 56 is composed of the second hole forming member 52 projecting upward from the first hole portion 55 . The second hole forming member 52 is arranged at the lower end of the first hole portion 55 (first through hole 61). The second hole forming member 52 is erected from the bottom surface 61 a of the first through hole 61 . The height of the second hole forming member 52 is the same as the height of the annular member 51 at the base portion 48 . A second through hole 62 is arranged inside the second hole forming member 52 .

The second through-hole 62 has an elliptical shape with a major axis along the radial direction of the lid 10 in FIG. 25 . This second through-hole 62 allows insertion of the long axis of the lock connecting portion 38 and the lid connecting portion 46 (having an elliptical cross section), and also allows insertion of the intermediary portion 47 (having a circular cross section). That is, the lock connecting portion 38 , the lid connecting portion 46 and the intermediary portion 47 of the opening/closing aid 45 are pushed into the second through hole 62 from above.

The long axis and short axis of the second through hole 62 have lengths corresponding to the long axis and short axis of the lid connecting portion 46 . Accordingly, in order for the lid connecting portion 46 to pass through the second through hole 62, it is necessary to align the major axis and the minor axis. That is, the second through-hole 62 has an insertion orientation restricting portion that restricts the orientation of the opening/closing assisting tool 45 when the opening/closing assisting tool 45 is inserted into the assisting tool insertion portion 15A.

The third hole portion 57 is formed continuously below the second hole portion 56 . As shown in FIG. 26 , the third through hole 63 formed inside the third hole portion 57 has one elliptical ellipse 63A continuous with the second through hole 62 and extends horizontally from the one ellipse 63A. It has one ellipse 63A and another ellipse 63B of the same shape, which are orthogonal to each other. Therefore, the third through-hole 63 includes an intersection hole 63C where one ellipse 63A and another ellipse 63B intersect, both ends of the major axis of one ellipse 63A, and both ends of the major axis of the other ellipse 63B. An inwardly convex convex portion 63a formed by intersecting one ellipse 63A and another ellipse 63B between the single holes 63D is formed in the shape of an orthogonal diagonal line. have four in The lock connecting portion 38 and the lid connecting portion 46 of the opening/closing aid 45 are pushed into the third through hole 63 from above.

The major axis of the other ellipse 63B is parallel to the minor axis of the second through hole 62 of the second hole portion 56 . Therefore, as shown in FIGS. 21 and 25, the second hole portion 56 is formed with downward surfaces 62a on both sides of the second through hole 62 in the minor axis direction. This downward surface 62a abuts against the lid connecting portion 46 and serves as a removal restricting portion that prevents the opening/closing aid 45 from being removed, the details of which will be described later.

The fourth hole portion 58 is formed continuously below the third hole portion 57 . The lock connecting portion 38 and the lid connecting portion 46 of the opening/closing aid 45 are pushed into the fourth through hole 64 from above. A fourth through hole 64 formed inside the fourth hole portion 58 is formed so that the long axis of the lid connecting portion 46 can rotate. Specifically, as shown in FIG. 27, the fourth through-hole 64 is formed of one ellipse 64A and another ellipse 64B similarly to the third through-hole 63, and additionally, one ellipse 64A and another ellipse 64B. are formed by cutting out two convex portions 64a that face each other on one diagonal line in an arc shape. That is, in the fourth through-hole 64, one ellipse 64A and another ellipse 64B intersect, the arc surface 64b faces one diagonal, and the convex portion 64a faces the other diagonal.

As a result, the lid connecting portion 46 accommodated in the fourth through hole 64 rotates and moves along the arc surface 64b between the one ellipse 64A and the other ellipse 64B, and hits the convex portion 64a. By coming into contact with each other, rotation is regulated and positioned. That is, the fourth hole portion 58 includes a locking positioning portion (convex portion 64a) for positioning the opening/closing assisting tool 45 at a locking position F1 along the long axis of the ellipse 64A with the major axis of the lid connecting portion 46, and the lid The long axis of the connecting portion 46 has an unlocking positioning portion (projection 64a) for positioning the opening/closing assisting tool 45 at the unlocking position F2 along the long axis of the other ellipse 64B.

As shown in FIGS. 21 and 27 , the fifth hole portion 59 is formed continuously below the fourth hole portion 58 . The lock connecting portion 38 of the opening/closing aid 45 is pushed into the fifth hole portion 59 from above.
A fifth through-hole 65 formed inside the fifth hole portion 59 has a shape similar to that of the fourth through-hole 64 and is smaller than the fourth through-hole 64 . 90° in the circumferential direction.

That is, the fifth through-hole 65 has a similar shape to the fourth through-hole 64 and is formed by one ellipse 65A and another ellipse 65B, and in addition, one ellipse 65A and another ellipse 65B intersect. Of the four protrusions 65a thus formed, two protrusions 65a facing each other on one diagonal line are cut out in an arc shape. That is, in the fifth through-hole 65, one ellipse 65A and another ellipse 65B intersect, the circular arc surface 65b faces one diagonal, and the convex portion 65a faces the other diagonal.

As a result, the lock connecting portion 38 accommodated in the fifth through-hole 65 rotates and moves along the arc surface 65b between the one ellipse 65A and the other ellipse 65B, and hits the convex portion 65a. By coming into contact with each other, rotation is regulated and positioned. That is, the fifth hole portion 59 includes a locking positioning portion (convex portion 65a) for positioning the opening/closing assisting tool 45 at a locking position F1 along the long axis of the ellipse 65A having the long axis of the lock connecting portion 38, and a lock position F1. The long axis of the connecting portion 38 has an unlocking positioning portion (projection 65a) for positioning the opening/closing assisting tool 45 at the unlocking position F2 along the long axis of the other ellipse 65B.

As shown in FIG. 21, a horizontal stepped surface 66 is provided between the fourth through hole 64 and the fifth through hole 65 (fifth hole portion 59). The end of the long axis of the lid connecting portion 46 abuts against the stepped surface 66 . Further, the lock mounting portion 31 is formed continuously below the fifth hole portion 59 (fifth through hole 65).

The first through-hole 61, the second through-hole 62, the third through-hole 63, the fourth through-hole 64, and the fifth through-hole 65 have the same vertical axis. The axial centers of the upper connection hole 39, the lower connection hole 41 and the space 34 are also the same. The inner flange portion 33 of the lock mounting portion 31 is configured so that the hook portion 8 can be assembled with the lock hole main body 30 .

After removing the opening/closing aid 45, a cap K (see FIG. 2) having a lower large diameter portion K1 and an upper small diameter portion K2 is attached to the first through hole 61 of the locking hole portion 15. .

In the above configuration, the case where the lid 10 is fitted in the opening 2 of the frame 3 (the receiving base 5) and the lock body 19 is at the locked position F1 and the unlocked position F2 will be described. First, in FIGS. 2, 28 and 29, at the locking position F1 of the lock body 19, the upper surface 9a, one surface 9b and the other surface 9c of the hook 9 are arranged on the lower surface 7a of the receiving frame 7 with a predetermined gap therebetween. , the upper surface 9a of the hook 9 contacts the lower surface 7a of the receiving frame 7, so that the lid 10 is not opened.

At the unlocked position F2 shown in FIG. off. Therefore, the lid 10 can be opened by rotating around the hinge 20 arranged on the back side of the lid 10 . In FIG. 28, the direction of rotation of the lock body 19 (hook 9) is indicated by an arrow. In both the locked position F1 and the unlocked position F2, the lid 10 maintains a state of being fitted into the frame 3 by its own weight unless an external force acts on the lid 10 .

A case will be described in which the unlocking position F2 shown in FIG. 30 is reached from the locking position F1 shown in FIG. When the lock body 19 is in the locking position F1, the locking hole 15 is fitted with a cap K (see FIG. 2) or the like. The cap K is removed to change from the locked position F1 to the unlocked position F2.

When the opening/closing assisting tool 45 is inserted into the assisting tool insertion portion 15A from above, the lock connecting portion 38 of the opening/closing assisting tool 45 enters from the assisting tool insertion portion 15A into the lock mounting portion 31, and the lock attached to the lock mounting portion 31 is engaged. It is connected so as to rotate together with the body portion 19 . Accordingly, by rotating the opening/closing auxiliary tool 45 in the vertical direction, the lock body 19 can be rotated to switch between the unlocked position F2 and the locked position F1.

In the opening/closing assisting tool 45 , members other than the tool connecting portion 49 of the opening/closing assisting tool 45 can be pushed into the through hole of the locking hole portion 15 . At this time, the opening/closing assisting tool 45 is installed such that the open portion of the bending body 54 of the tool connecting portion 49 faces the circumferential direction of the lid 10 in the opening/closing assisting tool 45 .

Specifically, how to push the opening/closing aid 45 into the locking hole 15 will be described. At the locking position F1, the lock connecting portion 38 and the lid connecting portion 46 of the opening/closing aid 45 are easily pushed into the first through hole 61 . Although the lock connecting portion 38 and the lid connecting portion 46 are oval shapes orthogonal to each other, the long axes of the lock connecting portion 38 and the lid connecting portion 46 can be inserted into the second through hole 62 . Therefore, first, the lock connecting portion 38 is pushed into the second through hole 62 , and then the lid connecting portion 46 is pushed into the second through hole 62 . Further, the opening/closing assisting tool 45 is regulated by the insertion direction regulating portion.

When the entire opening/closing aid 45 is pushed downward, the lock connecting portion 38 and the lid connecting portion 46 are pushed into the third through hole 63 . At this time, the third through hole 63 has one ellipse 63A continuous with the second through hole 62, and another ellipse 63B having the same shape as the one ellipse and perpendicular to the one ellipse 63A in the horizontal direction. , the lock connecting portion 38 and the lid connecting portion 46 are pushed into the third through hole 63 .

Further, when the entire opening/closing assisting tool 45 is pushed downward, the lid connecting portion 46 is pushed into the fourth through hole 64 which includes the third through hole 63 inside and outside in the radial direction and is formed in the shape of a two-ellipse aggregate. Since the major axis of the fifth through-hole 65 is formed to be larger than the major axis of the elliptical shape of the lock connecting portion 38 , the lock connecting portion 38 is pushed into the fifth through-hole 65 . The lock connecting portion 38 is inserted through the upper connecting hole 39 and pushed into the lower connecting hole 41 of the substantially rectangular flange member 40 . On the other hand, when the lock connecting portion 38 is pushed into the connecting pilot hole 41 , the outer end lower surface portion 46 c of the long axis of the lid connecting portion 46 contacts the stepped surface 66 .

Also, in the intermediary portion 47, since the circular cross section of the intermediary portion 47 is the same as the short axis of the lock connection portion 38, the first through hole 61, the second through hole 62, the third through hole 63, and the fourth through hole Pushed into 64.

In the base portion 48 , the lower surface 51 a of the annular member 51 is formed to be larger than the outer diameter of the second hole forming member 52 , so that the lower surface 51 a of the annular member 51 contacts the bottom surface 61 a of the first through hole 61 . touch. Since the height of the first through hole 61 in the second hole forming member 52 from the bottom surface 61a is the same as the height of the annular member 51 in the base portion 48, the downward movement of the opening/closing aid 45 is restricted. Also, the lower portion of the vertical rod 53 of the tool connecting portion 49 enters the first through hole 61 .

In this manner, the opening/closing assisting tool 45 is inserted into the assisting tool inserting portion 15A of the locking hole portion 15, so that the base portion 48 is inserted into the first through hole 61, the intermediate portion 47 is inserted into the first through hole 61, the second through hole 61, and the second through hole 61. The hole 62 , the third through hole 63 , the fourth through hole 64 , the lid connecting portion 46 is accommodated in the fourth through hole 64 , and the lock connecting portion 38 extends from the fifth through hole 65 to the hook insertion hole of the lock mounting portion 31 . 32 to be inserted into the lock body 19 and connected to the lock body 19 so as to rotate together. The tool connecting portion 49 of the opening/closing aid 45 protrudes upward from the upper surface of the lid 10 through the first through hole 61 .

At the locking position F<b>1 of the lock body 19 , the opening/closing aid 45 including the lock connecting portion 38 is pushed into the lock hole 15 . Since there is nothing to hinder the upward movement of the opening/closing auxiliary member 45 with respect to the lock body 19 at the locking position F1, the opening/closing auxiliary member 45 is connected to the lock hole portion 15 so as to be easily detachable.

In this embodiment, the opening/closing tool 16 is used for the movement from the locked position F1 of the lock body 19 to the unlocked position F2 of the lock body 19 . The opening/closing tool 16 is attached to the tool connecting portion 49 . In this case, at the locking position F1, the bent body 54 of the tool connecting portion 49 is installed so as to face the circumferential direction of the lid 10 . That is, as shown in FIG. 29, the planar portion 28 of the wide portion 27 of the opening/closing tool 16 is placed on the opposing inner surface 54a of the bending body 54 of the opening/closing assisting tool 45 with respect to the tool connecting portion 49 oriented in this manner. Make a locking connection (abutment). Then, the opening/closing assisting tool 45 is rotated in one direction (in this case, as indicated by the arrow in FIG. 1, rightward in plan view). By doing so, the state of the opening/closing assisting tool 45 as shown in FIG. Since the opening/closing assisting tool 45 is positioned to rotate by the locking positioning portion of the locking hole portion 15, it can be reliably unlocked. The state of FIG. 30 is the unlocked position F2 of the lock main body 19 in which the hook 9 is disengaged from the receiving frame 7 .

At the unlocked position F2 of the lock main body 19, the opening/closing aid 45 including the lock connecting portion 38 is unremovably connected. That is, even if an attempt is made to lift the opening/closing assisting tool 45 using the tool main body 23, the upper surface 46a of the lid connecting portion 46 of the opening/closing assisting tool 45 cannot be lifted because the opening/closing assisting tool 45 has been rotated by 90° from the locking position F1. is positioned below the downward surface 62a of the second hole 56, and when the opening/closing aid 45 moves upward, the upper surface 46a abuts the downward surface 62a. That is, the downward surface 62a serves as the removal restricting portion that restricts the opening/closing assisting tool 45 connected to the lock main body 19 at the unlocked position F2 from being removed from the lock main body 19. As shown in FIG.

When the opening/closing aid 45 is lifted by a predetermined distance, the tool connecting portion 49 rises above the lid 10, and the lower surface 51a of the annular member 51 of the base portion 48 rises above the bottom surface 61a of the first through hole 61. . Although the lock connecting portion 38 is also raised by a predetermined distance, the lock connecting portion 38 remains inserted into the upper connection hole 39 and the lower connection hole 41 .

With the lock main body 19 at the unlocked position F2, the lid 10 is configured to be disengaged from the frame 3 by being operated to move in a predetermined disengagement direction using the opening/closing tool 16 . That is, the lid 10 can be opened/closed vertically with respect to the frame 3 around the hinge 20 by using the opening/closing tool 16, and can be opened/closed around the hinge 20 in a substantially horizontal direction.

When the lid 10 is to be edge-cut with respect to the frame 3, an opening/closing tool 16 is inserted into the crowbar hole 13 (edge-cutting insertion portion) to cut the edge of the lid 10 and the frame 3. For example, when sand is accumulated around the lid 10, the opening/closing tool 16 and the burr hole 13 are used to cut the edge between the lid 10 and the frame 3. - 特許庁

When the opening/closing tool 16 is used to open/close the lid 10 around the hinge 20 in a substantially horizontal direction, the operator holding the handle 25 of the opening/closing tool 16 pulls the opening/closing tool 16 in a substantially horizontal direction. . When the lock main body 19 is positioned at the unlocked position F2, the locking direction in which the opening/closing tool 16 is pulled is along the detachment direction of the lid 10. As shown in FIG.

Specifically, the opening/closing aid 45 installed in the locking hole portion 15 of the lid 10 and connected to the lock main body portion 19 at the unlocking position F2 is positioned at the center of the lid 10 as shown in FIGS. The bending body 54 as a hook-shaped body of the tool connecting part 49 is arranged on the side opposite to the hinge 20 with respect to the part, and the bending body 54 as the hook-shaped body of the tool connecting part 49 opens toward the hinge 20 and has a convex shape directed away from the hinge 20. there is

Therefore, the direction in which the front end portion 24 of the opening/closing tool 16 is engaged with the bending body 54 and the direction in which the lid 10 is removed are the directions away from the hinge 20 . Therefore, by using the opening/closing tool 16, the lid 10 can be easily opened and closed. In addition, in the opening/closing assisting tool 45 connected to the lock main body 19 at the unlocking position F2, as shown in FIG. Therefore, it becomes a direction other than the detachment direction.

When the lock main body 19 is positioned at the locking position F1, the locking direction is a direction other than the disengagement direction. Therefore, the opening/closing assisting tool 45 can determine whether it is locked or unlocked depending on the orientation of the tool connecting portion 49 .

Further, when the lid 10 is opened and the prescribed work for the manhole is completed, the lid 10 is fitted into the frame 3 to bring the lid 10 into a closed state. At this time, the tool connecting portion 49 is in a state where the lock connecting portion 38 is connected to the lock main body portion 19 and protrudes upward from the upper surface of the lid 10 . Therefore, when opening and closing the lid 10, it becomes easy to check the protruding tool connecting portion 49, and it is possible to effectively prevent forgetting to lock the lid.

When the lid 10 is fitted to the frame 3, the lock body 19 is moved from the unlocked position F2 to the locked position F1. At this time, the opening/closing tool 16 is used to rotate the opening/closing auxiliary tool 45 to the locking position F1 side, and the lock body 19 is set to the locking position F1. It can be removed upward from the locking hole portion 15 . Since the opening/closing assisting tool 45 is rotationally positioned by the locking positioning portion of the locking hole portion 15 , it can be reliably locked and removed upward from the locking hole portion 15 . After removing the opening/closing aid 45 , the cap K is attached to the locking hole 15 .

In this embodiment, the opening/closing aid 45 is connected to the hook main body 8A of the lock body 19 to unlock it, and the opening/closing tool 16 is connected to the opening/closing aid 45 in that state to perform the opening/closing operation of the lid 10. . Therefore, after the lid 10 is closed, the user's attention goes to the opening/closing assisting tool 45 without forgetting to lock the lid 10, thereby enhancing security.

In this embodiment, the lock connecting portion 38 of the opening/closing aid 45 is detachably connected to the hook body 8A of the lock body portion 19 at the locking position F1, and is connected to the hook body 8A at the unlocking position F2. Non-detachably connected. Therefore, the use of the opening/closing aid 45 facilitates the opening/closing operation of the lid 10 .

In this embodiment, the lid 10 is provided with an opening/closing locking portion for directly locking the opening/closing tool 16 to the lid in order to lift the lid 10 fitted in the frame 3 and perform the opening/closing operation. not Therefore, it is limited to opening and closing the lid 10 using the opening and closing aid 45 and the opening and closing tool 16 . Therefore, high security can be obtained.

In the present embodiment, the burr hole 13 and the hinge 20 are arranged to face each other across the central portion of the lid 10 in the radial direction of the lid 10 . A specific burr hole 14 as an edge cutting insertion portion is arranged at a position where an opening/closing locking portion for directly locking the opening/closing tool 16 to the lid 10 is normally provided. Therefore, the border between the lid 10 and the frame body 3 can be easily cut off, and mischievous opening and closing operations around the hinge 20 can be prevented, thereby enhancing security.

The present invention can be modified in various ways without departing from the scope of the invention. In addition, the specific configuration of each part is not limited to the above embodiment. In the above-described embodiment, the opening/closing aid 45 includes the tool connecting portion 49, and the tool connecting portion 49 includes the vertical rod 53 and the bent body 54 to be bent. On the other hand, in the example shown in FIG. 31 , the shape of the tool connecting portion 49 is provided with a curved body 70 curved from the vertical rod 53 . The inner surface of the curved body 70 is the opposing inner surface 54a, and the planar portion 28 of the opening/closing tool 16 can come into contact therewith.

32 to 36 show another example of the opening/closing aid 45 of the second embodiment. This opening/closing assisting tool 45 has the same tool connecting portion 49 and base portion 48 as the opening/closing assisting tool 45 of the above embodiment, but differs in the lock connecting portion 38 and the lid connecting portion 46 . In the above embodiment, the long axis of the lid connecting portion 46 with respect to the base portion 48 is on both tool connecting portions 49 side, and the long axis of the lock connecting portion 38 with respect to the base portion 48 is along the tool connecting portion 49 side. A configuration was described. However, in the second embodiment, the long axes of the lid connecting portion 46 and the lock connecting portion 38 are shifted from the above-described one embodiment.

Specifically, the long axis of the lid connecting portion 46 is oriented 15 degrees off from the direction in which both tool connecting portions 49 are arranged, and the long axis of the lock connecting portion 38 is aligned with the direction along the tool connecting portion 49. are 15 degrees apart from each other. That is, the center of the locking hole portion 15 is arranged to be shifted with respect to the facing direction of the specific crowbar hole 14 and the hinge 20 , so that it is shifted.

In the opening/closing assisting tool 45 of the second embodiment, since the long axes of the lid connecting portion 46 and the lock connecting portion 38 are deviated, the opening/closing assisting tool 45 is connected to the lock main body portion 19 and is positioned at the unlocked position. In the state of F2, the opening/closing tool 16 is engaged with the tool connecting portion 49 and pulled in the direction along which the lid 10 is removed, which is the direction in which the specific crowbar hole 14 and the hinge 20 face each other. parallel direction. Therefore, the lid 10 can be easily opened and closed.

In the above embodiment, the opening/closing assisting tool 45 is inserted into the assisting tool inserting portion 15A and connected to the lock body 19, but the assisting tool inserting portion 15A may not be provided. Further, in the above-described embodiment, in the opening/closing assisting tool 45, the case where the tool connecting portion 49 of the opening/closing assisting tool 45 protrudes from the upper surface of the lid 10 is described, but it does not have to protrude. In the above-described embodiment, the opening/closing assisting tool 45 is rotated to switch between the unlocked position F2 and the locked position F1. It is also possible to switch the position of .

Further, in the above embodiment, the locking direction in which the opening/closing tool 16 is pulled has been described along the detachment direction of the lid 10, but the locking direction may not be along the detachment direction.

In the above-described embodiment, the specific burl hole 14 has been described as being opposed to the hinge support mechanism 18 in which the hinge 20 as the hinge portion is arranged in the circumferential direction of the lid 10 . It is also possible to displace it to the opposite position and to place the locking mechanism in the opposite position.

DESCRIPTION OF SYMBOLS 1... Lid structure, 3... Frame body, 7... Receiving frame, 8... Hook part, 8A... Hook main body, 9... Hook, 10... Lid, 13... Burl hole, 14... Specific burl hole, 15... Locking hole part, DESCRIPTION OF SYMBOLS 15A... Auxiliary tool insertion part, 16... Opening/closing tool, 17... Base end part, 18... Hinge support mechanism, 19... Lock body part, 20... Hinge, 23... Tool body, 24... Front end part, 26... Mounting part, 27 Wide portion 28 Plane portion 29 Locking mechanism 30 Locking hole main body 31 Lock attachment portion 32 Hook insertion hole 33 Inner flange portion 33a Contact surface 36 Top plate portion 37... Support part 38... Lock connection part 39... Connection upper hole 40... Flange member 41... Connection pilot hole 45... Opening/closing aid 46... Lid connection part 47... Intermediate part 48... Base part 49 ... Tool connecting portion 49A ... Inclined body 49B ... Key body 50 ... Disk member 51 ... Annular member 52 ... Second hole forming member 53 ... Vertical rod 54 ... Bent body 54a ... Opposing inner surface, 55... First hole part, 56... Second hole part, 57... Third hole part, 58... Fourth hole part, 59... Fifth hole part, 60... Lower hole, 61... First through hole, 62... Third hole part Two through-holes 63 Third through-hole 63A One ellipse 63B Another ellipse 63C Intersection hole 63D Single hole 63a Projection 64 Fourth through-hole 64A One ellipse , 64B... Another ellipse, 64a... Convex part, 64b... Arc surface, 65... Fifth through hole, 65A... One ellipse, 65B... Another ellipse, 65a... Convex part, 65b... Arc surface, 66... Stepped Surface 70 Curved body F1 Locked position F2 Unlocked position K Cap

Claims (6)

a frame buried in the ground and forming an opening communicating between the ground and the ground;
a lid fitted in the frame and capable of closing the opening of the frame;
a locking mechanism capable of locking and unlocking the lid closing the opening of the frame,
The locking mechanism includes a lock body provided on the lid and capable of switching between a locked position and an unlocked position, and a lock body provided on the frame and engaged with the lock body in the locked position to engage the lid. An opening and closing auxiliary tool for assisting the opening and closing operation of the lid in a manhole lid structure having a lock engaging portion that locks so that the manhole is not opened,
a lock connecting portion configured to be connectable to the lock body portion from the upper surface side of the lid so that the position of the lock body portion can be switched;
An opening/closing tool is operated while the lock connecting portion is connected to the lock body portion at the unlocked position so that the opening/closing operation of the lid can be performed using the opening/closing tool for opening/closing the lid with respect to the frame. A manhole cover opening/closing aid, comprising: a tool connecting portion configured to be connectable. 2. The lock connecting portion is configured to be detachably connected to the lock body in the locked position and non-detachably connected to the lock body in the unlocked position. Aid for opening and closing manhole covers as described. The lock connecting portion is configured to be inserted downward from the upper surface of the lid and connected to the lock main body,
3. The manhole cover according to claim 1, wherein the tool connecting portion is configured to protrude upward from the upper surface of the lid while the lock connecting portion is connected to the lock main body. Opening and closing aid. The lid is configured to be disengaged from the frame by being operated to move in a predetermined disengagement direction using the opening/closing tool,
The tool connecting portion is configured to engage and connect with the opening/closing tool in a predetermined engaging direction,
The lock main body to which the lock connecting portion is connected,
In the unlocked position, the locking direction is along the disengagement direction,
4. A manhole cover opening/closing aid according to any one of claims 1 to 3, wherein the locking direction is a direction other than the detachment direction when the manhole cover is positioned at the locking position. a frame buried in the ground and forming an opening communicating between the ground and the ground;
a lid fitted in the frame and capable of closing the opening of the frame;
a locking mechanism capable of locking and unlocking the lid closing the opening of the frame,
The locking mechanism includes a lock body provided on the lid and capable of switching between a locked position and an unlocked position, and a lock body provided on the frame and engaged with the lock body in the locked position to engage the lid. has a lock engaging portion that locks so that it does not open,
A manhole cover structure capable of opening and closing the cover using the opening/closing aid and the opening/closing tool for the manhole cover according to any one of claims 1 to 4,
The lid is not provided with an opening/closing locking portion for directly locking the opening/closing tool to the lid in order to open/close the lid by lifting the lid fitted in the frame. manhole cover structure. further comprising a hinge portion that connects the lid and the frame so that they can be opened and closed,
The lid includes an edge cutting insertion part into which the opening and closing tool is inserted to cut the edges of the lid and the frame,
6. The manhole cover structure according to claim 5, wherein the edge cutting insertion portion and the hinge portion are arranged to face each other across the central portion of the cover in the radial direction of the cover.