JP3006405U - Tool for opening the manhole cover - Google Patents

Abstract

(57) [Summary] [Purpose] Not only when the lock device is set for the wastewater pipe, but also when it is set for the rainwater pipe, the lock is released by a simple operation to open the manhole cover. [Structure] A rod-shaped tool main body 17 is provided with a first pressing portion 18 for pressing a weight lid body that closes a keyhole of a manhole lid and pressing the weight to unlock the weight. An engaging projection 19 capable of engaging with an engaging recess inside the manhole cover is provided at the tip of the first pressing portion 18. A second pressing portion 20 is provided on the side of the first pressing portion 18 for pressing the receiving portion of the weight facing the keyhole and unlocking the weight. Pressing part 1
In the state in which the engaging projection 19 is engaged with the engaging recess at the rear of 8, the pressing engaging portion 21 that engages with the upper surface of the edge portion of the keyhole in the manhole lid and the upper edge portion of the receiving frame of the manhole are engaged. A fulcrum engagement portion 22 that can be used is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an opening tool used for opening a manhole cover provided with a locking device which is selectively used for a wastewater pipe and a rainwater pipe.

[0002]

[Prior art]

 Conventionally, as this type of opening tool, as described in Japanese Utility Model Publication No. 1-124847, the tip of a rod-shaped tool body is engaged with a recess for engagement from the small opening of a manhole cover to its inner surface. The hook-shaped engaging portion is provided, and the hook-shaped engaging portion engages with the upper surface of the edge portion of the small opening in the manhole cover, and the hook-shaped engaging portion is provided behind the hook-shaped engaging portion. A configuration is known in which a fulcrum engaging portion that can be engaged with the upper edge of the receiving frame of the manhole lid in a state of being engaged with the engaging concave portion is provided.

In order to open the manhole cover with the above-mentioned opening tool, first, the hook-shaped engaging part is inserted from the small opening of the manhole cover to engage with the engaging concave part, and the pressing engaging part and the fulcrum are used. The engaging portion is engaged with the upper surface of the edge portion of the small opening and the upper edge of the receiving frame. By operating the tool body in this state, the engaging part between the fulcrum engaging part and the receiving frame is used as the fulcrum, the engaging part between the pressing engaging part and the manhole lid is used as the force point, and the hook-like engaging part The manhole cover is lifted up by the lever principle, with the engaging point between the engaging recess of the manhole cover and the manhole cover as the point of action. Then, by pulling up the tool main body, the manhole cover can be removed from the receiving frame and opened while being supported by the force point and the action point.

[0004]

[Problems to be solved by the device]

 By the way, as for the manhole cover, there is a type with a lock device that is selectively used for the sewage pipe and the rainwater pipe. That is, the weight is rotatably supported inside the manhole cover, the weight is provided with a lock portion capable of removably engaging with the engaging portion of the receiving frame of the manhole, and the weight is provided with the lock portion and the engagement portion. The lid body that releasably closes the keyhole of the manhole lid in the engaged state is detachably supported, and the weight is provided with a receiving portion that faces the inside of the keyhole on the side of the lid body. ing. In the case of a waste water pipe, the keyhole of the manhole cover is openably closed by the cover of the weight in a locked state of the lock part of the weight and the engagement part of the receiving frame. Also, in the case of a rainwater pipe, the cover of the weight is removed, and the keyhole of the manhole cover is opened in the locked state so that the receiving part of the weight faces the keyhole from the inside. ing .

In the above-described conventional manhole lid opening tool, when a lid body for closing the keyhole is used for the dirty water pipe, the lid body is pressed by the tip portion of the tool body, and the lid body, the weight, the lock The manhole cover can be opened as described above by rotating the lock portion and the like to disengage the lock portion from the engaging portion and unlock. However, when the lid is not used for rainwater pipes, the receiving parts are arranged on both sides of the key hole so as to face the inside of the key hole. It is difficult to perform the unlocking work as shown in. Therefore, it is difficult to open the manhole cover.

The present invention solves the above-mentioned conventional problems, and the simple operation is possible not only when the locking device is set for the wastewater pipe but also when it is set for the rainwater pipe. It is an object of the present invention to provide a tool for opening a manhole cover that can be unlocked to open the manhole cover.

[0007]

[Means for Solving the Problems]

 The technical means of the present invention for achieving the above object is to provide a lock portion in which a weight is rotatably supported inside a manhole cover, and the weight is detachably engageable with an engaging portion of a receiving frame of a manhole. Is provided, and a lid body that releasably closes the keyhole of the manhole lid is detachably supported by the weight in the engaged state of the lock portion and the engagement portion, and the weight is provided on the side of the lid body. Is a tool for opening the manhole lid, which is selectively used for the sewage pipe and the rainwater pipe depending on the presence or absence of the lid body. To press the lid of the weight that closes the keyhole at the tip to release the lock from the engaging portion to unlock, and to press the weight to hold it in the unlocked state. Is provided at the front end of the first pressing portion. An engaging projection is provided which is engaged with an engaging recess formed on the inner surface of the lid, and faces the key hole when the weight lid does not have a lid body on the side of the first pressing portion. A second pressing portion is provided for pressing the receiving portion of the weight and disengaging the lock portion from the engaging portion. The second pressing portion is provided on the upper surface of the edge portion of the keyhole in the manhole cover behind the pressing portion. It is provided with a pressing engagement portion to be fitted.

Further, in the above technical means, the tool body is engaged with the upper edge of the receiving frame of the manhole cover in a state where the engaging protrusion is engaged with the engaging recess of the manhole cover behind the pressing part. It is preferable to have a fulcrum engaging portion to be obtained.

[0009]

[Action]

 According to the present invention configured as described above, in the case where the lock device uses the lid body for closing the keyhole of the manhole lid for the dirty water pipe, the inside of the keyhole is locked by the first pressing portion of the tool body. The lid can be pressed with to rotate the lid, the weight, the lock portion, and the like, and the lock portion can be unlocked by disengaging the lock portion from the engaging portion of the receiving frame. Also, when the lock device is used for rainwater pipes and the keyhole of the manhole cover is opened without using the lid, the second pressing portion of the tool body presses the receiving portion from the keyhole, and the weight, lock portion, etc. The lock portion can be unlocked by rotating the lock portion to disengage the lock portion from the engaging portion of the receiving frame. Then, in the unlocked state, the engaging projection of the tool body is engaged with the engaging recess inside the manhole cover, and the pressing engagement part of the tool body is engaged with the upper surface of the edge of the keyhole in the manhole cover. Then, by engaging the rear position of the pressing part in the tool body with the upper edge of the receiving frame and operating the tool body, the manhole cover is lifted up by the lever principle, and then the tool body is pulled up to lift the manhole body. The lid can be released from the receiving frame while being supported by the engaging projection and the pressing engagement portion.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show a tool for opening a manhole cover and a manhole cover part according to an embodiment of the present invention. FIG. 1 is an overall perspective view, FIG. 2 is an enlarged perspective view of a main part, and FIGS. FIGS. 5 and 6 are sectional views for explaining the opening operation in the case of a manhole cover for a dirty water pipe, and FIGS. 5 and 6 are sectional views for explaining the opening operation in the case of a manhole cover for a rainwater pipe.

First, an outline of a lock device for a manhole cover will be described. In FIG. 3 to FIG. 6, 1 is a manhole receiving frame, 2 is an iron manhole cover that is openably supported by the receiving frame 1, and 3 is a locking device.

A keyhole 4 for opening and closing is formed on the outer edge portion of the manhole cover 2, and an engaging concave portion 5 is formed on the inner side surface of the manhole cover 2 at a position closer to the center of the keyhole 4 and used for the engagement. The recess 5 gradually becomes deeper toward the keyhole 4 side, and a substantially vertical engaging surface 6 is formed on the keyhole 4 side. A notch 8 is formed at the tip of the intermediate portion of the partition wall 7 between the keyhole 4 and the engaging recess 5. An engaging portion 9 is integrally provided inside the keyhole 4 in the receiving frame 1.

A support plate 10 is integrally provided inside the manhole cover 2, and a base portion of a weight 11 is rotatably supported by a shaft 12 on the support plate 10. A lid 13 is detachably supported on the base of the weight 11, and a hook-shaped lock portion 14 is provided on the tip of the weight 11 so as to project therefrom. With the lock portion 14 arranged at the engagement position with the engagement portion 9 of the receiving frame 1 and the manhole lid 2 being locked so as not to be separated from the receiving frame 1, the lid body 13 has the keyhole of the manhole lid 2. 4 and the keyhole 4 is closed (see FIG. 3). When the lid body 13, the weight 11 and the lock portion 14 are rotated counterclockwise, the lid body 13 is retracted inward of the key hole 4 to open the key hole 4, and the lock portion 14 is engaged. It is designed to be detached from the joint 9 (see FIG. 4). Receiving portions 15 are provided on both sides of the lid 13 at the middle portion of the weight 11. The receiving portion 15 is set to be lower than the lid body 13 and faces both sides of the keyhole 4 from the inside thereof.

Next, the opening tool of the present invention will be described. As shown in FIGS. 1 and 2, the opening tool 16 of the present invention is made of metal, and the lid 13 of the weight 11 that closes the keyhole 4 is pressed against the tip of the rod-shaped tool body 17 to lock the lock part 1 The first pressing portion 18 is provided with the curved first pressing portion 18 for releasing the lock of the weight 4 from the engaging portion 9 and pressing the base portion of the weight 11 to hold the weight 11 in the unlocked state. An engaging projection 19 that engages with the engaging recess 5 of the manhole cover 2 is provided at the tip of the. On both sides of the tip of the first pressing portion 18, the receiving portion 15 of the weight 11 facing the keyhole 4 is pressed by the side of the engaging projection 19 when the lid 13 is not present in the keyhole 4, and the lock portion 14 is locked. A second pressing portion 20 that is disengaged from the engaging portion 9 is provided so as to project.

Behind the first pressing portion 18, the tool main body 17 is provided with pressing engaging portions 21 that are engaged with the upper surfaces of both side edge portions of the keyhole 4 in the manhole cover 2 so as to protrude from both sides. Behind the first pressing portion 18, a fulcrum engagement portion 22 that can engage with the upper edge of the receiving frame 1 is projected. The fulcrum engaging portion 22 is formed wide so as to straddle between the pressing engaging portions 21. The pressing engaging portion 21 and the fulcrum engaging portion 22 are respectively in the state where the engaging projection 19 is engaged with the engaging concave portion 5 of the manhole cover 2 and the upper surface of the manhole cover 2 and the upper edge of the receiving frame 1, respectively. Is configured to engage the section.

The tool main body 17 is tilted so that its axis is at an acute angle with respect to each surface of the pressing engagement portion 21 and the fulcrum engagement portion 22, and the handle portion 23 is orthogonal to the base of the tool main body 17. Is attached, and a prying portion 24 is provided at the base end of the tool body 17.

The operation of opening the manhole cover 2 when the cover body 13 for closing the keyhole 4 of the manhole cover 2 for the dirty water pipe is used by the opening tool 16 of the present invention configured as described above will be described. To do. First, as shown in FIG. 3, the lid 13 is pushed in the keyhole 4 by the first pressing portion 18 of the tool body 17, and as shown in FIG. 4, the lid 13, the weight 11, the lock portion 14, etc. Is rotated counterclockwise to disengage the lock portion 14 from the engaging portion 9 of the receiving frame 1 and unlock. Next, the engaging projection 19 of the tool body 17 is engaged with the engaging recess 5 of the manhole cover 2, and the pressing engagement portion 21 and the fulcrum engagement portion 22 of the tool body 17 are connected to the keyhole of the manhole cover 2. It engages with the upper surface of the edge portion of 4 and the upper edge portion of the receiving frame 1. At this time, the lid 13 is pressed by the rear side part of the first pressing part 18, and the base part of the weight 11 is pressed by the tip part of the first pressing part 18 to rotate the weight 11 and the like counterclockwise. It is held in the unlocked state after being moved. Therefore, by operating the tool main body 17 with the handle portion 23, the engaging portion between the fulcrum engaging portion 22 and the receiving frame 1 is used as a fulcrum, and the engaging portion between the pressing engaging portion 21 and the manhole cover 2 is used as a force point. The manhole cover 2 can be lifted up by the principle of leverage, with the engaging point between the engaging projection 19 and the engaging recess 5 of the manhole cover 2 as the point of action. Then, by pulling up the tool body 17, the manhole cover 2 can be removed from the receiving frame 1 and opened while being supported by the force point and the action point.

Next, an operation of opening the manhole cover 2 when the keyhole 4 of the manhole cover 2 is opened by the opening tool 16 of the present invention for a rainwater pipe without using the cover 13 will be described. First, as shown in FIG. 5, the receiving portion 15 is pushed from the keyhole 4 by the second pushing portion 20 of the tool body 17, and as shown in FIG. 6, the weight 11, the lock portion 14 and the like are rotated counterclockwise. The lock portion 14 is moved to disengage the lock portion 14 from the engaging portion 9 of the receiving frame 1 to release the lock. Next, the engaging projection 19 of the tool body 17 is engaged with the engaging recess 5 of the manhole cover 2, and the pressing engagement portion 21 and the fulcrum engagement portion 22 of the tool body 17 are attached to the manhole cover 2. The upper surface of the edge of the keyhole 4 and the upper edge of the receiving frame 1 are engaged with each other. At this time, the base of the weight 11 is pressed by the tip of the first pressing portion 18 to hold the weight 11 and the like in the unlocked state in which the weight 11 and the like are rotated counterclockwise. Therefore, by manipulating the tool body 17 with the handle portion 23, the manhole cover 2 can be removed from the receiving frame 1 and opened in the same manner as described above.

The arrangement of the pressing engagement portion 21 and the fulcrum engagement portion 22 and the inclination angle of the tool body 17 can be appropriately selected. Further, the fulcrum engagement portion 22 is not particularly provided, and the tool body 17 may be engaged with the upper edge portion of the receiving frame 1. In addition, the present invention can be variously modified in design without departing from the basic technical idea.

[0020]

[Effect of device]

 As described above, according to the present invention, when the locking device uses the lid for closing the keyhole of the manhole lid for the dirty water pipe, the lid is pushed in the keyhole by the first pushing portion of the tool body. Then, by rotating the lid body, the weight, the lock portion, etc., the lock portion can be released from the engaging portion of the receiving frame to unlock. When the lock device is used as rainwater and the keyhole of the manhole cover is opened without using the cover, the second pressing part of the tool body presses the receiving part from the keyhole to remove the weight, the locking part, etc. The lock part can be unlocked by rotating the lock part from the engaging part of the receiving frame. Then, in the unlocked state, the engaging projection of the tool body is engaged with the engaging recess inside the manhole lid, and the pressing engagement portion of the tool body is engaged with the upper surface of the edge of the keyhole in the manhole lid. Then, by engaging the rear position of the pressing part in the tool body with the upper edge of the receiving frame and operating the tool body, the manhole cover is lifted up by the lever principle, and then the manhole is pulled up by pulling up the tool body. The lid can be removed from the receiving frame and opened while being supported by the engaging projection and the pressing engagement portion. Therefore, not only when the lock device is set for the wastewater pipe, but also when it is set for the rainwater pipe, the manhole cover can be opened by unlocking it by a simple operation.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a tool for opening a manhole cover according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part showing the opening tool.

FIG. 3 is a cross-sectional view illustrating the opening tool and is an explanatory view for explaining a pressed state of a lid in the case of a manhole lid for a wastewater pipe.

FIG. 4 is a cross-sectional view showing the opening tool for explaining a prying-up state in the case of a manhole cover for a wastewater pipe.

FIG. 5 is a cross-sectional view for explaining the opening tool and for explaining a pressed state of a lid in the case of a rainwater pipe manhole lid.

FIG. 6 is a cross-sectional view showing the opening tool for explaining a prying-up state in the case of a rainwater pipe manhole cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving frame 2 Manhole cover 3 Lock device 4 Keyhole 5 Engagement recess 9 Engaging part 11 Weight 13 Lid body 14 Lock part 15 Receiving part 16 Opening tool 17 Tool body 18 First pressing part 19 Engaging projection 20 20 Second Pressing part 21 pressing engaging part 22 fulcrum engaging part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B66F 15/00 E02D 29/14

Claims (2)

[Scope of utility model registration request] 1. A weight is rotatably supported inside a manhole cover, a lock portion is provided on the weight so as to be detachably engageable with an engaging portion of a receiving frame of the manhole, and the weight is provided with the lock portion. A lid that releasably closes the keyhole of the manhole lid in the engaged state of the engaging portion is detachably supported, and a receiving portion that is exposed to the inside of the keyhole on the side of the lid by the weight is provided. A manhole cover opening tool that is provided and selectively used for sewage pipes and rainwater pipes depending on the presence or absence of the lid body, and presses the lid body of the weight that closes the key hole at the tip of the rod-shaped tool body. Then, a first pressing part is provided for releasing the lock part from the engaging part to unlock it, and pressing the weight to hold it in the unlocked state. The tip of the first pressing part is provided. To engage with the engaging recess formed on the inner surface of the manhole cover An engaging projection is provided, and when the key hole has no lid for the weight on the side of the first pressing portion, the receiving portion of the weight facing the key hole is pressed to lock the lock portion. A second pressing portion for disengaging from the engaging portion is provided, and the manhole cover is provided with a pressing engaging portion that is engaged with the upper surface of the edge portion of the keyhole of the manhole lid behind the pressing portion. Tools. 2. A fulcrum engagement portion capable of engaging with an upper edge of a receiving frame of a manhole cover in a state where a tool body is engaged with an engagement protrusion of a manhole cover at a rear side of a pressing portion. The tool for opening a manhole cover according to claim 1, further comprising: