JP3021519U - Manhole cover - Google Patents

Abstract

(57) [Abstract] [Problem] The first problem is a simple structure that can be easily and inexpensively manufactured, and improves the operation of opening and closing the manhole cover.
It also provides a manhole cover that has excellent durability and can be easily and quickly repaired. The second problem is to reliably prevent the bolt from protruding from the upper surface of the manhole cover even when the bolt is loosened, insufficiently tightened, or forgotten. An insertion piece (2) having a pair of arms (15) having parallel grooves (17) on opposite surfaces extending from an inner surface (9) of a manhole cover frame (3) and having sliding nuts (24) having screw holes (25) at both ends.
6 by inserting it into the parallel groove 17
Using a stopper piece 29 divided into a fitting piece 30 and a locking piece 31, the fitting piece 30 is fitted in the vertical groove 20 provided at the arm tip, and the locking piece 31 is projected on the lower surface of the arm. 21 and the parallel groove 17 is closed, and a play space is provided between the ceiling surface of the parallel groove 15 and the upper surface of the insertion piece 26 of the sliding nut 24 so that the upper surface of the sliding nut can be lifted up to contact with the rear surface of the manhole cover. It was

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 A manhole cover that can be opened / closed to cover a manhole that is installed in septic tanks, sewers, underground passages, etc. and serves as an entrance / exit for people who perform inspections and cleaning.

[0002]

[Prior art]

 Conventionally, manholes that have been installed in septic tanks, sewers, underpasses, etc. that serve as entrances and exits for people who perform inspections and cleaning prevent outsiders from entering, and people, cars, motorcycles, bicycles, etc. The car was covered with a manhole cover that could be opened and closed so that it could pass safely. This manhole cover is composed of a manhole cover frame and a manhole cover that fits into the manhole cover frame.The manhole cover frame is installed on the ground at the open end position of the manhole or on the upper face of the body, and the upper position of the manhole cover frame is set on the ground or body. As an extension of the upper surface, the manhole cover was detachably fitted to this manhole cover frame, and the manhole was opened and closed.

Further, the manhole cover is locked with a fixing metal fitting so that an outside person cannot easily open it. As shown in FIGS. 13 and 14, the fixing metal fitting has two arms 82 and 83 extending so as to come into contact with the upper surface and the lower surface of the manhole cover 91, and the arm that comes into contact with the upper surface of the manhole cover frame 91. A gripping tool for welding a nut 84 to the lower surface in the middle of 82 and providing a communicating hole 85 in this arm 82 for communicating with the screw hole of the nut 84 so as to be attached to the outer peripheral position of the manhole cover frame 91 by the two arms 82, 83. 81, a frame 86 in which the ceiling surface and one side surface of the hollow box body are cut off to accommodate the holding tool 81, and a base plate having a through hole 88 through which a bolt 89 passes. 15 and a fixing bracket 80 composed of 87, and as shown in FIGS. 15 and 16, holes are provided at both ends of a plate 96 interposed on the lower surface of the manhole cover frame 91, and bolts 97 and 98 are inserted from the same direction. There is known a fixture including a fixture main body 95 penetrating each of these two holes and welded to each other, and a nut 99 screwed to each of the bolts 97 and 98.

When the manhole cover 90 is connected to the manhole cover frame 91 with the fixing fittings 80 shown in FIGS. 13 and 14, the manhole cover frame 91 is held by the two arms 82 and 83 having the holding tool 81 in the holding tool 81. The upper and lower ends are clamped and attached to the outer peripheral position, the clamping tool 81 is housed in the frame 86, and the base end of the holding plate 87 whose front end is placed on the upper surface of the manhole cover 90 is the frame body. It is housed in 86 and placed on the holding tool 81, the bolt 89 is penetrated into the through hole 88 of the holding plate 87, and the nut 84 of the holding tool 81 is screwed to push down the holding plate 87 to lower the manhole cover 90. Is connected to the manhole cover frame 91. However, when the manhole cover 90 is opened, the fixing bracket 80 also removes the pressing plate 87 together with the bolt 89, so that the bolt 89 and the pressing plate 87 are likely to be lost during field work. The holding plate 87 is exposed on the upper surface, and the upper edge of the frame body 86 that secures the upper and lower passages of the holding plate 87 is also exposed, and the bolt 89 is also exposed. There were cases where unevenness was generated on the part, which hindered the walking of pedestrians. Furthermore, if the bolt 89 is loosened for some reason or is not tightened sufficiently, not only the bolt 89 but also the holding plate 87 will be in a state of protruding from the ground or the upper surface of the body 93, which not only obstructs pedestrians. However, when a car or the like passes over this, the weight of the fixing metal fitting 80 may be damaged.

In the latter fixtures shown in FIGS. 15 and 16, the plate 96 of the fixture body 95 is directed in the radial direction of the manhole cover frame 91, and the center of the plate 96 is placed on the ground or the upper surface of the frame 93 and the manhole cover frame 91. Of the two bolts 97 and 98 extending from the fixing bracket main body 95 to be interposed between the bolt 97 and the lower end of the fixing metal fitting 95, the bolt 97 located in the opening hole of the manhole cover frame 91 passes through the first bolt 97. The manhole cover 90 is provided with a through hole 100, the second through hole 101 is formed in the manhole cover frame 91 so that the bolt 97 is passed through the first through hole 100, and the remaining bolt 98 is passed by the bolt 98. The remaining bolt 98 of the above is penetrated into the second through hole 101, and the nut 99 is screwed into each of the two bolts 97, 98 to connect the manhole cover 90 and the manhole cover frame 91. , The manhole cover 90 is connected to the manhole cover frame 91. In this case, the manhole cover 90 can be removed by simply removing the nut 99 from the bolt 97 penetrating the first through hole 100 provided in the manhole cover 90. Only the nut 99 is removed together with the manhole cover 90. The number of fixtures that separate with 90 is reduced. However, when closing the manhole cover 90, the manhole cover 90 must be aligned so that all the first through holes 100 provided in the manhole cover 90 are simultaneously penetrated by the bolts 98 that penetrate the first through hole 100. Since it cannot be fitted to the lid frame 91, the operator has to perform positioning that is difficult to align by rotating the heavy manhole lid 90 while keeping it lifted, which causes not only heavy labor but also labor. It took time and the work efficiency was poor. If the manhole cover 90 is fitted into the manhole cover frame 91 without the positions of the first through holes 100 provided in the manhole cover 90 and the bolts 98 being aligned, the weight of the manhole cover 90 will be applied to the bolts 97 and the bolts 97. May be damaged. In this case, it is necessary to replace all the fixing brackets as a repair work, and it takes time and labor to replace the fixing bracket main body 95 interposed between the manhole cover 91 and the ground or the upper surface of the body 93. Further, the fixing metal fittings were made of metal, so that the unit price was high.

[0006]

[Problems to be solved by the device]

 The first problem to be solved by the present invention is to solve these problems in the related art, to make the manufacturing simple and inexpensive, to improve the manhole cover opening / closing work, and to have excellent durability. The purpose is to provide a manhole cover that can be easily and quickly repaired. The second issue is to prevent the head of the bolt from protruding from the top surface of the manhole cover even if the bolt is loosened, insufficiently tightened, or forgot to be tightened. Also, the damage due to the crushing of them is surely prevented.

[0007]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) A manhole cover which is formed by fitting a manhole cover to a manhole cover frame having an opening hole communicating with the manhole. A pair of rigid arms having opposing surfaces that are substantially parallel to each other is extended horizontally from the inner surface of the frame at intervals, and extends in the longitudinal direction of the arms on the opposing surfaces of the pair of arms and is opened at the tip of the arms. A pair of arms is provided with stoppers that prevent the slip-out of the sliding nut by inserting a sliding nut that slides in the parallel groove while providing a parallel groove and a vertically extending screw hole. A removable hole is provided at the tip of the manhole cover, and a hole is formed in the manhole cover to allow the bolt to pass through.The bolt is screwed into the sliding nut through the hole in the manhole cover and Manhole cover characterized by being connected to the manhole cover frame 2) Not located inside the parallel groove between the ceiling surface of the parallel groove and the upper surfaces of both ends of the sliding nut located inside the parallel groove The manhole cover described in 1) above with a play space where the upper surface of the sliding nut can be raised so that the upper surface of the sliding nut contacts or comes close to the back surface of the manhole cover. 3) Screwed with the sliding nut. When the bolt head of the bolt is inserted deeply into the manhole cover until it comes into contact with the open end of the hole, the screw hole of the sliding nut placed on the lower surface of the parallel groove is located at the lower end of the bolt. The manhole cover described in 2) above, in which the top surface of the bolt head is lower than the top surface of the manhole cover near the hole in this state. 4) Parallel from the top surfaces of the tips of the pair of arms. groove A vertical groove communicating with each other is provided, and an elastic fitting piece is fitted between the vertical grooves, and the lower surface of the fitting piece exposed between the pair of arms is bent at a lower edge to form the lower surface of the pair of arms. An elastic locking piece extending downward with the same width as that of the fitting piece from the arm lower surface to the edge of the locking piece facing the lower surface of the pair of arm tips. The manhole cover according to any one of the above 1) to 3), in which a protrusion having a length or more is provided and a stopper is configured using a sheet-like stopper piece composed of the fitting piece and the locking piece 5) Communication with a manhole In a manhole cover formed by fitting a manhole cover to a manhole cover frame having opening holes, a pair of rigid arms whose opposing surfaces are substantially parallel to each other are horizontally extended from the inner surface of the manhole cover frame. Screw holes that extend vertically. In addition, attach a sliding nut that has an insertion part that warmly inserts the pair of arms so that the pair of arms inserts into the insertion part, and attach a stopper that prevents the sliding nut from falling off. Removably provided at the tip of the pair of arms, a hole is formed in the manhole cover to allow a bolt to pass through, and the bolt is screwed into the sliding nut through the hole in the manhole cover. Manhole cover characterized by connecting the manhole cover frame with the manhole cover frame 6) Between the upper surface of the inner wall of the insertion part and the upper surface of the pair of arms, the upper surface of the sliding nut contacts or comes close to the rear surface of the manhole cover. The manhole cover described in 4) above, which has a play space so that the sliding nut can be raised. 7) Opening a hole provided in the manhole cover with the bolt head of the bolt screwed with the sliding nut. The screw hole of the sliding nut placed on the lower surface of the inner wall of the insertion part is slightly screwed into the lower end of the bolt when it is inserted deeply into the hole until it comes into contact with the mouth end. The manhole cover described in 6) above, in which the top surface of the portion is lower than the upper surface of the manhole cover near the hole. 8) The manhole cover frame, the pair of arms, and the sliding nut are made of fiber reinforced plastic. 7) The manhole cover is listed.

[0008]

[Action]

 In the present invention, first, the manhole cover frame is fixed to the ground or the upper surface of the body with the opening of the manhole cover frame aligned with the manhole. Fit the manhole cover into this manhole cover frame, align the holes on the manhole cover with the screw holes of the sliding nut on the manhole cover frame, pass the bolt through the hole on the manhole cover, and slide the nut. The manhole cover and the manhole cover frame are connected to each other by screwing into and the manhole can be opened and closed freely. Since the sliding nut is inserted in the parallel groove of the pair of arms as described in claim 1 or the pair of arms is inserted in the insertion portion of the sliding nut as described in claim 5, Since the nut is slidable in the longitudinal direction of the pair of arms, if the hole of the manhole cover and the screw hole of the sliding nut are slightly misaligned, insert a finger or bolt into the hole of the manhole cover and slide the nut. It is possible to shift the position of and align the screw hole with the manhole cover hole. After aligning the holes in the manhole cover with the screw holes in the sliding nut, insert the bolt into the hole in the manhole cover and screw it into the sliding nut. As the bolt is tightened, the sliding nut is strongly pulled toward the back side of the manhole cover, and the sliding nut is pressed firmly against the upper surface of the horizontal groove or the lower surface of the arm to restrain the movement of the sliding nut. At the same time, the manhole cover is pressed against the manhole cover frame to connect it, thus blocking the manhole. When opening the manhole cover, by loosening all bolts and removing these bolts from the sliding nuts, the manhole cover can be easily removed from the manhole cover frame and the manhole can be opened.

Since the sliding nut, the pair of arms, and the stopper are both provided inside the manhole cover, they are not crushed and damaged by the passage of a vehicle or the like, and there is an obstacle to the passage of people or vehicles. It will never happen. Also, since the sliding nut can be removed from the pair of arms by releasing the stopper, if the sliding nut is damaged, it can be easily replaced with a new sliding nut, improving the workability of repair work.

According to the second and sixth aspects, since the play space for raising the sliding nut is provided in the parallel groove or in the insertion portion so that the upper surface of the sliding nut comes into contact with or comes close to the back surface of the manhole cover, the manhole cover is provided. Before screwing into the slide nut that has passed through the hole of the slide nut, the bottom end of the bolt is lowered by its own weight until it comes into contact with the screw hole of the slide nut located on the lower surface in the parallel groove or the inner wall upper surface of the insertion part, and the slide nut The exposed part of the screw part exposed from the hole of the manhole cover of the bolt before screwing is reduced. If this bolt is tightened, the bolt descends until the head of the bolt comes into contact with the opening end of the hole in the manhole cover, and slides after the head of the bolt comes into contact with the opening end of the hole in the manhole cover. When the nut starts to rise and reaches a position where it comes in contact with or comes close to the back surface of the manhole cover, this sliding nut makes strong pressure contact with the upper surface of the parallel groove or the lower surface of the arm, and the sliding nut The movement is restrained, and the manhole cover is firmly pressed against the manhole cover frame to be connected.

Further, as described in claims 3 and 7, when the bolt head is deeply inserted into the hole until it comes into contact with the opening end of the hole provided in the manhole cover, the lower end of the bolt has a lower end of the sliding nut. If the bolt top is positioned lower than the upper surface of the manhole cover with the bolt inserted deeply, the bolt will protrude from the upper surface of the manhole cover. There is nothing to do. Also, when the bolt is tightened, the screwed sliding nut starts to rise without changing the bolt position, and when the upper surface of the sliding nut comes into contact with or comes close to the back surface of the manhole cover. Similarly to the above, the sliding nut is restrained and the manhole cover and the manhole cover frame are strongly pressed and connected. Even when the bolt is removed, the position of the bolt does not change and the sliding nut descends, so that the screw engagement between the bolt and the sliding nut is released. In this way, the bolts can always be tightened and removed with the bolts inserted into the holes of the manhole cover to the maximum extent so that they will not protrude from the top surface of the manhole cover. Even in such cases, the bolts are prevented from protruding from the upper surface of the manhole cover to prevent them from obstructing the passage of people and vehicles, and from being crushed and damaged by these.

In the stopper according to claim 4, the stopper piece is deeply inserted from the side of the locking piece into the vertical groove of the pair of arm tips, and the locking piece reaching near the communicating parallel groove is bent by hand while being parallel. Pull out from the open position of the pair of arm tips along the groove. As a result, the fitting pieces arranged in a line along the folding curve are pulled as the locking piece advances to be fitted into the vertical grooves, and the locking piece is bent along the bending curve to allow the tip of the pair of arms to move. It is protruding from the parallel groove open position. A part of the lower surface of the pair of arms expanded to the same width as the fitting piece by pushing down the locking piece by hand so as to be an extension of the fitting piece is a protrusion provided on the lower surface of the pair of arms. Although it is in contact with the origin, it is passed between the protrusions while bending the locking piece. As a result, the restored locking piece does not come off due to the protrusion, and the fitting piece is also fitted into the vertical groove, so that the extended part of the locking piece is caught by the pair of arms and the fitting piece is It does not come out of the top, and the fitting piece fitted in the vertical groove continues to close the parallel groove and acts as a stopper. When releasing the stopper, the stopper pieces can be easily removed from the pair of arms by reversing the above steps, and the stopper is released. If the manhole cover frame, the pair of arms and the sliding nut are made of reinforced plastic as described in claim 8, the weight can be reduced, workability can be improved, resistance to rust and durability can be improved.

[0013]

[Embodiment of device]

 Although the stopper according to claim 4 is preferable as the stopper, a through-hole extending in a direction orthogonal to the longitudinal direction of the pair of arms is linearly provided in the pair of arms, and an elongated rod body is inserted into the through-hole. There are also cases in which a stopper is used as a stopper, or an elastic ring is wound around the tip of each arm or wound around the tip of a pair of arms to be wound as a stopper. The sliding nut that slides in the parallel groove may be the same or different in thickness between the portion located inside the parallel groove and the other portion. The extension direction of the pair of arms is preferably extended toward the center of the opening hole of the manhole cover frame, but it may be extended in a slightly displaced direction. The screw hole may be provided directly on the sliding nut, or a part having a screw hole such as a nut may be embedded to form the screw hole on the sliding nut. The sliding nut, the manhole cover frame, and the pair of arms are preferably made of reinforced plastic (FRP), but they may be made of metal such as iron or a combination thereof. The stopper piece according to claim 4 can be formed by pressing or the like. This material is preferably made of plastic.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In Embodiment 1 shown in FIGS. 1 to 7, a parallel groove is provided on the facing surfaces of a pair of arms, and a sliding nut is gently inserted into the parallel groove, and as a stopper, it has flexibility so that it can be bent in two. This is an example of using a sheet-shaped stopper piece. The second embodiment shown in FIGS. 8 to 9 is an example in which screwing is performed with the sliding nut in a state where the bolt head is always deeply inserted to the state of coming into contact with the hole of the manhole cover. The third embodiment shown in FIGS. 10 to 11 has an insertion hole for inserting a pair of arms as an insertion hole provided in a sliding nut, and a stopper rod having a swingable tip which penetrates a pair of arm tips as a stopper. Is an example using. An example of another sliding nut shown in FIG. 12 is an example in which the insertion portion for inserting the pair of arms is an insertion groove in which the insertion hole of the sliding nut shown in the third embodiment is opened from the side wall.

FIG. 1 is an explanatory view showing a usage state of the first embodiment, FIG. 2 is a vertical sectional view showing a connection state of a manhole cover and a manhole cover frame in the first embodiment, and FIG. 3 is a slide in the first embodiment. 4 is an explanatory view showing a mounting state of the moving nut and its stopper piece, FIG. 4 is an explanatory view showing a mounting state of the sliding nut and its stopper piece in the first embodiment, and FIG. 5 is a bolt and a sliding body in the first embodiment. 6 is an explanatory view showing a screwed state with the moving nut, FIG. 6 is an explanatory view showing a screwed state with the bolt and the sliding nut in the first embodiment, and FIG. 7 is a diagram showing the bolt and the sliding nut in the first embodiment. FIG. 8 is an explanatory diagram showing a screwed state, FIG. 8 is an explanatory diagram showing a screwed state of a bolt and a sliding nut of the second embodiment, and FIG. 9 is an explanatory diagram showing a screwed state of a bolt and a sliding nut of the second embodiment. 10 and 11 are explanatory views showing the mounting state of the sliding nut and its stopper rod in the third embodiment, and FIG. FIG. 12 is an explanatory diagram showing a screwed state of a bolt and a sliding nut in Example 3, and FIG. 12 is an explanatory diagram showing an example of another sliding nut.

Example 1 (see FIGS. 1 to 7) In FIG. 1, 1 is a manhole cover composed of a manhole cover 2 and a manhole cover frame 3, 2 is a circular manhole cover with a diameter of 53 cm and made of fiber reinforced plastic (FRP) 3, the fitting portion bottom wall 12 having an opening hole 8 having an inner diameter of about 45 cm is integrally formed on the lower edge of the circular fitting portion side wall 11 having an inner diameter of about 53 cm to form the fitting portion 10 of the manhole cover 2. A manhole cover frame having an extending portion 13 extending downward from the peripheral edge of the opening hole 8 of the fitting part bottom wall 12, 4 is a concave portion provided on the upper surface of the manhole cover 2 for accommodating the head of the bolt 39, and 5 is the same. A hole penetrating from the bottom surface of the concave portion 4 to the back surface of the manhole cover 2, 8 is an opening hole of the manhole cover frame 3, 9 is an inner surface of the extending portion 13 of the manhole cover frame 3 in which the opening hole 8 is formed, and 10 is a manhole. Side wall 11 of the fitting portion of the lid frame 3 The fitting portion of the manhole cover frame 3 formed with the fitting portion bottom wall 12, 11 is the fitting portion side wall of the manhole lid frame 3, 12 is the fitting portion bottom wall of the manhole lid frame 3, and 13 is the manhole lid. Extending portion of the frame 3, 15 is a pair of arms horizontally extended from the inner surface of the extending portion 13 of the manhole cover frame 3 toward the center of the opening hole 8, 16 is a facing surface between the arms 15, 17 is a A parallel groove provided on the facing surface 16 and extending in the longitudinal direction of the arm 15 and opened at the tip of the arm 15, 18 is an upper surface of the parallel groove 17, 19 is a lower surface of the parallel groove 17, and 20 is a pair of arms 15. A vertical groove extending from the upper surface of the arm to the parallel groove 17 at the front end of the arm, 21 is a protrusion provided on the lower surface of the tip of the arm 15, 24 is a screw hole 25 at the center, a width of 2 cm and a height of 1. Equipped with an insert piece 26 that extends horizontally from the side of about 5 cm and has a height of about 3 mm Sliding nut, 25 is a screw hole of the sliding nut 24, 26 is an insertion piece of the sliding nut 24, and 29 is a slightly elastic plastic having a width of 3.5 cm, a thickness of 3 mm, and a height of 2.5 cm. By providing a folding curve 32 formed by thinning the inner thickness extending in the center in the center, it is divided into a fitting piece 30 and a locking piece 31 and can be bent at this folding curve 32. 2 is a stopper piece having notches 33 on both side edges of the locking piece 31, 30 is a fitting piece of the stopper piece 29, 31 is a locking piece of the stopper piece 29, and 32 is the stopper. A bending curve of the piece 29, 33 is a cutout portion of the stopper piece 29, 36 is an extension piece horizontally extended along the circumferential direction on the peripheral surface of the fitting portion side wall 11 of the manhole cover frame 3, and 37 is Ribs provided on the outer surfaces of the pair of arms 15, 39 are bolts, and 40 are washers. , 41 manholes, 42 is a building frame.

In the first embodiment shown in FIGS. 1 to 7, the extending portion 13 of the manhole cover frame 3 is fitted and attached to the manhole 41, the outer periphery of the manhole cover frame 3 is fixed with concrete, and the manhole cover frame 3 is attached. The upper edge of the side wall 11 of the fitting portion of is aligned with the position of the upper surface of the concrete and is buried. In order to attach the sliding nut 24 to the pair of arms 15 provided in the manhole cover frame 3, the insertion piece 26 of the sliding nut 24 is inserted into the parallel groove 17 of the pair of arms 15 to attach the sliding nut 24 to the arm. 15 is provided so as to be slidable along and movable in a direction orthogonal to the sliding direction, and thereafter, the locking piece 31 of the stopper piece 29 is placed in the vertical groove 20 at the tip end of the arm 15 and the parallel groove is formed. 17 is inserted deeply until it comes in contact with 17, and the elastic locking piece 31 is bent with a finger to pass through the parallel groove 17 and pulled out from the tip of the arm 15 where the parallel groove 17 is opened. Indicates that the lower edge is deeply fitted into the vertical groove 20 until it comes into contact with the parallel groove 17, and the locking piece 31 of the stopper piece 29 is parallel to the bending curve 32 of the stopper piece 29 at a right angle. Is it the open position of groove 17? The projected state. After that, the locking piece 31 of the stopper piece 29 is pushed down with a finger, the tip of the arm 15 is passed through the notches 33 at both ends of the locking piece 31, and the edge of the notch 33 is engaged with the protrusion 21 at the arm tip. Then, the attachment of the stopper piece 29 is completed. As a result, the sliding nut 24 prevented from slipping off by the stopper piece 29 becomes slidable in the parallel groove 17 closed by the fitting piece 30 of the stopper piece 29, and is also paired with the side surface of the sliding nut 24. The arm 15 is movable in the direction orthogonal to the sliding direction by the gap between the arm 15 and the facing surface 16. Further, the sliding nut 24 can be raised by the amount of play space between the upper surface of the extending piece 36 of the sliding nut 24 and the parallel groove ceiling surface 18.

To attach the manhole cover 2 to the manhole cover frame 3, the manhole cover 2 is attached to the manhole cover frame 3 so that the hole 5 provided in the manhole cover 2 and the screw hole 25 of the sliding nut 24 are substantially aligned with each other. It is fitted into the fitting portion 10. If the screw hole 25 of the sliding nut 24 is misaligned from the hole 5 of the manhole cover 2, the manhole cover 2 is not moved, and a finger or a bolt is inserted from the hole 5 of the manhole cover 2 to remove the sliding nut 24. It may be moved so that the screw hole 25 of the sliding nut 24 and the hole 5 of the manhole cover 2 are aligned with each other. Since the upper surface of the sliding nut 24 is always located below the upper surface of the fitting portion bottom wall 12 of the manhole cover frame 3, if the screw hole 25 of the sliding nut 24 and the hole 5 of the manhole cover 2 are If the manhole cover 2 is significantly displaced, it can be rotated without being lifted and the manhole cover 2 can be rotated without causing any trouble.

Then, as shown in FIGS. 5 to 7, the bolt 39 is inserted into the hole 5 of the manhole cover 2 and screwed into the screw hole 25 of the sliding nut 24. Since the sliding nut 24 before screwing with the bolt 39 is lowered by its own weight to a position in contact with the lower surface 19 of the parallel groove, the bolt 39 should be inserted deeply until it comes into contact with the sliding nut 24 in this lowered state. Therefore, the recess 4 provided so that the head of the bolt 39 before screwing does not protrude from the upper surface of the manhole cover 2 can be formed shallowly. Before the sliding nut 24 is screwed into the bolt 39, the sliding nut 24 is in a state of being lowered to a position in contact with the parallel groove lower surface 19 (see FIG. 5). When screwed (see FIG. 6), the sliding nut 24 rises until it comes close to the parallel groove ceiling surface 18 (see FIG. 7), and the sliding nut 24 comes into pressure contact with the pair of arms 15 and the movement is restricted. Further, the manhole cover 2 is brought into pressure contact with the bottom wall 12 of the fitting portion of the manhole cover frame 3, and the manhole cover 2 and the manhole cover frame 3 are connected to close the manhole 41.

When opening the manhole 41, by loosening and removing all the bolts 39 screwed into the sliding nut 24, the manhole cover 2 can be easily removed from the manhole cover frame 3, and the manhole 41 is opened.

The sliding nut 24, which is a member for connecting the manhole cover 2 and the manhole cover frame 3, the pair of arms 15 and the stopper piece 29 are provided in the manhole cover 1 which is located below the manhole cover 2. Since it is located, it does not obstruct the passage of people, cars, etc., and because it does not receive a large force from the outside when it is crushed by people, cars, etc., it prevents damage and has excellent durability. Becomes When the product life due to long-term use such as the screw hole 25 becoming loose or the sliding nut 24 becoming unusable due to some reason, the stopper piece 29 is paired in the reverse order of the above-mentioned mounting method. Since it can be easily removed from the arm 15, the new sliding nut 24 can be easily replaced, and repair work is completed only by replacing the sliding nut 24. Further, since the sliding nut 24 is made of plastic, it can be manufactured at low cost and is lightweight, so that the labor and cost required for the repair work can be greatly reduced. Example 2 (see FIGS. 8 to 9) In Example 2 shown in FIGS. 8 to 9, the parallel groove ceiling surface 18 of the parallel groove 17 provided on the facing surface 16 of the pair of arms 15 and the sliding nut 24 are provided. A position where the distance from the upper surface of the insertion piece 26 is lowered so that the screw hole 25 slightly engages with the tip of the bolt 39 deeply inserted so that the head of the bolt 39 contacts the hole 5 of the manhole cover 2. In this example, a wide play space is provided in which the upper surface of the sliding nut 24 rises to approach the rear surface of the manhole cover 2. In the second embodiment, the sliding nut 24 before being screwed into the bolt 39 is in a state of being lowered by its own weight, and the lower end of the bolt 39 is screwed into the screw hole 25 of the sliding nut 24 in this lowered state. Means that the bolt 39 must be inserted deeply until the head of the bolt 39 comes into contact with the hole 5 of the manhole cover 2, and the sliding nut 24 screwed by tightening the bolt 39 is inserted. The piece 26 is raised and pressed until it contacts the parallel groove ceiling surface 18. Even when the bolt 39 is removed from the sliding nut 24, the head of the bolt 39 is always in contact with the hole 5 of the manhole cover 2 which is the bottom surface of the recess 4, and the bolt 39 is not moved up and down. Since the sliding nut 24 is moved up and down for screwing, the depth of the recess 4 can be made as shallow as the height of the head of the bolt 39. Even at this depth, the bolt 39 becomes loose, insufficiently tightened, or forgotten to be tightened. In addition, the bolt does not protrude from the recess 4 and does not obstruct the passage of people or cars, and there is no fear of damage. Other symbols, configurations, and operational effects are the same as those in the first embodiment.

Example 3 (see Examples 10 to 11) In the figure, reference numeral 45 denotes a pair of arms horizontally extending from the inner surface 9 of the extension portion 13 of the manhole cover frame 3 toward the center of the opening hole 8, and 46. A stopper insertion hole for linearly penetrating the tips of the pair of arms 45 to insert a stopper rod 47. 47 is a swing pin 48 swingably pin-joined to the tips to form a ring-shaped rear end. A bent elongated stopper rod, 48 is a swing pin of the stopper rod 47, 49 is a sliding nut provided with an insertion hole 51 into which a pair of arms 45 are inserted, and 51 is the sliding nut 49. Is the insertion hole. In the third embodiment shown in FIGS. 10 to 11, insertion holes 51 into which a pair of arms 45 are inserted are provided at both ends of a sliding nut 49, and the insertion holes 51 are wider than the width of a pair of arms 45. From the width of the bolt 39, the head of the bolt 39 comes into contact with the hole 5 of the manhole cover 2, and the screw hole 25 is slightly screwed into the lower end of the bolt 39 that is inserted deeply. The height is such that the upper surface rises close to the rear surface of the manhole cover 2. The sliding nut 49 is inserted so that the pair of arms 45 are inserted into the insertion holes 51, and the insertion stopper rod 47 is inserted into the stopper insertion holes 46 at the tips of the pair of arms 45 to complete the attachment. After the stopper rod 47 is inserted into the stopper insertion hole 46, the swing pin 48 at the front end swings downward due to its own weight, so that it does not fall out. In order to replace the sliding nut 49, first, the swinging pin 48 of the stopper rod 47 can be linearly lifted with a finger and the stopper rod 47 can be pulled out to easily remove it from the pair of arms 45. It can be easily replaced with a new sliding nut 49 as required. Other symbols, configurations, and effects are the same as those in the second embodiment.

Another example of sliding nut (see FIG. 12) 54 is a sliding nut provided with an insertion groove 55 for inserting the pair of arms 45, and 55 is an insertion groove of the sliding nut 54. Another example of the sliding nut 54 shown in FIG. 12 is the sliding nut 54 having the same shape as that of the sliding nut 49 of the third embodiment, in which the insertion hole 51 is opened from the side wall of the sliding nut 49. The insertion groove 55 has the same shape as the insertion hole 51 of the sliding nut 49 in the third embodiment opened from the side wall. The other reference numerals, the use of this sliding nut, and the working effects are the same as those in the third embodiment.

[0024]

[Effect of device]

 In the present invention, the sliding nut is inserted into the parallel groove provided in the pair of arms, or the pair of arms is inserted into the insertion portion provided in the sliding nut. Slide the arm in the longitudinal direction. Therefore, when the manhole cover is fitted to the manhole cover frame, even if the holes of the manhole cover and the screw holes of the sliding nut are slightly misaligned, the sliding nuts can be displaced easily and quickly. In addition, they can be surely matched, and the workability of connecting the manhole cover to the manhole cover frame is improved. Also, since the sliding nut is provided inside the manhole cover, it is not exposed to the outside, so it does not cause any obstacles when people or vehicles pass, and is further crushed by being crushed directly by the vehicle. There is no need to worry about it, and it has excellent durability. Since the sliding nut can be removed from the pair of arms by releasing the stopper, if the screw hole of the sliding nut becomes loose or is damaged for any reason, you can easily replace it with a new sliding nut. Since it can be done, the repair work can be performed easily, quickly and surely, and the workability is excellent.

According to the second and sixth aspects of the present invention, since the sliding nut can be raised, the bolt can be inserted deeply into the hole of the manhole cover by the rising length of the sliding nut. The exposed portion of the bolt that is exposed to the maximum is reduced, and when the sliding nut is moved up and down, the bolt is always inserted into the hole of the manhole cover to the maximum. Even if the bolt is not exposed to the outside and is loosened greatly, the exposed part of the bolt is reduced to prevent it from obstructing the passage of people and vehicles, and to prevent damage from the passage of vehicles.

According to the third and seventh aspects, the bolt before screwing with the sliding nut can be inserted to the maximum until the bolt head comes into contact with the hole of the manhole cover, and the bolt in this state can be inserted. The top surface of the head part is lower than the top surface of the manhole cover, and in this state it can be securely screwed into the sliding nut. Even in such a case, the top surface of the head of the bolt is prevented from protruding from the upper surface of the manhole cover, and it is surely prevented that it will further obstruct the passage of people and vehicles. In addition, the damage caused by the crushing of the protruding bolt can be surely prevented. If the manhole cover frame, the pair of arms and the sliding nut are made of reinforced plastic, it can be easily manufactured, the cost can be reduced, the weight can be reduced, and the workability of installing the manhole cover can be improved. It became something to do. According to the fourth aspect, the sheet-shaped stopper piece does not require any tools, and anyone can easily and surely attach and detach it with a small force, which is very excellent in workability. Furthermore, since this stopper piece is in the form of a sheet, it does not take up a lot of space, it is compact, and it can be used in any storage location.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a usage state of a first embodiment.

FIG. 2 is a vertical cross-sectional view showing a connected state of a manhole cover and a manhole cover frame in the first embodiment.

FIG. 3 is an explanatory view showing a mounting state of the sliding nut and its stopper piece in the first embodiment.

FIG. 4 is an explanatory view showing a mounting state of a sliding nut and a stopper piece thereof in the first embodiment.

FIG. 5 is an explanatory diagram showing a screwed state of the bolt and the sliding nut in the first embodiment.

FIG. 6 is an explanatory diagram showing a screwed state of the bolt and the sliding nut in the first embodiment.

FIG. 7 is an explanatory diagram showing a screwed state of the bolt and the sliding nut in the first embodiment.

FIG. 8 is an explanatory diagram showing a screwed state of the bolt and the sliding nut of the second embodiment.

FIG. 9 is an explanatory diagram showing a screwed state of a bolt and a sliding nut of the second embodiment.

FIG. 10 is an explanatory view showing a mounting state of a sliding nut and a stopper rod thereof in a third embodiment.

FIG. 11 is an explanatory diagram showing a screwed state of a bolt and a sliding nut in the third embodiment.

FIG. 12 is an explanatory view showing an example of another sliding nut.

FIG. 13 is an explanatory view showing a connection between a conventional manhole cover and a manhole cover frame.

FIG. 14 is an explanatory diagram showing a connection between a conventional manhole cover and a manhole cover frame.

FIG. 15 is an explanatory view showing a connection between a conventional manhole cover and a manhole cover frame.

FIG. 16 is an explanatory view showing a connection between a conventional manhole cover and a manhole cover frame.

[Explanation of symbols]

 1 Manhole Cover 2 Manhole Cover 3 Manhole Cover Frame 4 Recessed 5 Hole 6 Missing Number 7 Missing Number 8 Opening Hole 9 Inner Surface 10 Fitting Part 11 Fitting Part Side Wall 12 Fitting Part Bottom Wall 13 Extension Part 14 Missing Number 15 Arm 16 Opposing Face 17 Parallel Groove 18 Parallel groove Ceiling surface 19 Parallel groove lower surface 20 Vertical groove 21 Protrusion 22 Missing number 23 Missing number 24 Sliding nut 25 Screw hole 26 Inserting piece 27 Missing number 28 Missing number 29 Stopper piece 30 Fitting piece 31 Locking piece 32 Bending curve 33 Notch 34 Missing Number 35 Missing Number 36 Stretching Piece 37 Rib 38 Missing Number 39 Bolt 40 Washer 41 Manhole 42 Body 43 Missing Number 44 44 Missing Number 45 Arm 46 Stopper Inserting Hole 47 Stopper Rod 48 Swing Pin 49 Sliding Nut 50 Missing Number 51 Inserting Hole 53 Missing Number 52 Missing Number 52 Sliding nut 55 Insertion groove 80 Fixing metal fitting 81 Tool 82 Arm 83 Arm 84 Nut 85 Communication hole 86 Frame body 87 Holding plate 88 Through hole 89 Bolt 90 Manhole cover 91 Manhole cover frame 92 Manhole 93 Body 94 Block number 95 Fixing bracket body 96 Plate 97 Bolt 98 Bolt 99 Nut 100 First penetration Hole 101 Second through hole

Claims (8)

[Scope of utility model registration request] 1. A manhole cover formed by fitting a manhole cover to a manhole cover frame having an opening hole communicating with the manhole, wherein the manhole cover frame has a pair of rigid members whose opposing surfaces are substantially parallel to each other. The arms are horizontally extended at intervals, and parallel grooves that extend in the longitudinal direction of the arms and open at the tip of the arms are provided on the facing surfaces of the pair of arms, and a screw hole that extends vertically is provided and the parallel grooves are A sliding nut that slides is inserted into the parallel groove, and a stopper that prevents the sliding nut from slipping out is detachably provided at the tip of the pair of arms, and a hole is provided in the manhole cover for the bolt to pass through. The manhole cover, wherein the bolt is screwed into the sliding nut through a hole of the manhole cover to connect the manhole cover and the manhole cover frame. 2. The back surface of the manhole cover is the upper surface of the sliding nut that is not located inside the parallel groove between the ceiling surface of the parallel groove and the upper surfaces of both ends of the sliding nut located inside the parallel groove. The manhole cover according to claim 1, further comprising a play space in which the sliding nut can be raised so as to come into contact with or approach the sliding hole. 3. A slide placed on the lower surface of the parallel groove when the bolt head of the bolt screwed with the sliding nut is deeply inserted into the hole provided in the manhole cover until it comes into contact with the opening end of the hole. The manhole cover according to claim 2, wherein the screw hole of the nut is slightly screwed into the lower end of the bolt, and in this state, the top surface of the bolt head is lower than the upper surface of the manhole cover near the hole. 4. A pair of arms having vertical grooves communicating with parallel grooves from the upper surfaces of the tips of the arms, and elastic fitting pieces are fitted between the vertical grooves, and the fitting is exposed from between the pair of arms. An elastic locking piece extending downward with the same width as the fitting piece from the lower surface of the pair of arms through a bending curve is foldably connected to the lower edge of the joint piece, and A stopper is provided using a sheet-like stopper piece composed of the fitting piece and the locking piece, the projection having a length from the lower surface of the arm to the edge of the locking piece facing each other is provided on the lower surface. 1-3
Manhole cover described in either. 5. A manhole cover formed by fitting a manhole cover to a manhole cover frame having an opening hole communicating with the manhole, wherein a pair of rigid manhole cover frames whose opposing surfaces are substantially parallel to each other is provided. The pair of arms is inserted into the insertion portion by horizontally extending the arms at intervals and providing screw holes extending vertically and having an insertion portion for warmly inserting the pair of arms. A stopper that prevents the sliding nut from falling off is detachably provided at the tip of the pair of arms, a hole is formed in the manhole cover to allow a bolt to pass through, and the bolt is attached to the hole of the manhole cover. A manhole cover, characterized in that the manhole cover and the manhole cover frame are connected to each other by being screwed into the sliding nut via the manhole cover. 6. A play space is provided between the upper surface of the inner wall of the insertion portion and the upper surface of the pair of arms, so that the upper surface of the sliding nut can be raised so that the upper surface of the sliding nut contacts or approaches the rear surface of the manhole cover. The manhole cover according to claim 4, which is provided. 7. A slide placed on the lower surface of the inner wall of the insertion part when the bolt head of the bolt screwed with the sliding nut is deeply inserted into the hole until it comes into contact with the opening end of the hole provided in the manhole cover. 7. The manhole cover according to claim 6, wherein the screw hole of the moving nut is slightly screwed into the lower end of the bolt, and in this state, the top surface of the bolt head is lower than the upper surface of the manhole cover near the hole. 8. The manhole cover according to claim 1, wherein the manhole cover frame, the pair of arms and the sliding nut are made of fiber reinforced plastic.