JPH0679847U - Manhole iron lid plug structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the burr etc. from being inserted into the holes provided on the surface of the manhole iron cover, so that the iron cover cannot be easily opened. [Structure] Manhole iron cover 1 with through hole 1a and through groove 1
c is provided, and when the iron lid 1 is closed, the flat plate portion 2a of the stopper member 2 is provided.
Is fitted into the through hole 1a, and the elastic spring force of the compression spring member 3 causes the locking portion 2b to be provided on the lower surface of the iron lid.
Abut. When the iron lid 1 is opened, the claw of a tool having a claw is hooked in the hooking recess 2c of the stopper member 2 to rotate the stopper member 2, and the penetration groove 1c of the iron lid and the locking portion 2b of the stopper member are engaged. If the positions are matched, the plug member 2 is pushed up by the spring member 3, so the plug member 2 is pushed down against the elastic force of the spring member 3, and a bar or the like is inserted from the through hole 1a to move the iron lid 1. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper structure for a manhole iron cover, and more particularly to a stopper structure for preventing free insertion of a bar or the like used to open the manhole iron cover.

[0002]

[Prior art]

 To open the manhole iron cover in a closed state, some manipulators with a locking device release it, and then insert a burr or the like into a hole previously provided on the outer peripheral surface of the iron cover to lift and move the iron cover.

[0003]

[Problems to be solved by the device]

 By the way, in the conventional iron lid as described above, after unlocking the one with the lock device, and the one without the lock device, anyone can freely insert a bar etc. into the hole to open the iron lid. It can be opened. An object of the present invention is to improve such a hole in a conventional iron lid and provide a structure in which a bar or the like can be inserted only by a specific person.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a manhole iron lid plug structure according to the present invention has a manhole having a through hole in an outer peripheral portion and a pair of through grooves provided facing each other along the outer periphery of the through hole. An iron lid, a flat plate portion that can be fitted into the through hole, a pair of locking portions that are provided on the lower surface of the flat plate portion so as to project outward, and can be fitted into the through groove And a compression spring member that is supported from below by the manhole iron lid and elastically supports the plug member from below. The lower surface of the manhole iron lid has an outer periphery of the through hole. Has a ring-shaped plug receiving portion provided along with, and when the iron lid is closed, it abuts the locking portion of the plug member to receive the plug member, and the locking portion of the plug member is fixed to the manhole iron lid. When removing from the stopper receiving part of the plug, rotate the stopper member through the hook recess. It was a plug structure manhole iron lid, characterized in that to match the position the show-through groove of the locking portion.

[0005]

[Operation and effect of the device]

 According to the manhole iron lid plug structure of the present invention, there is apparently no hole into the surface of the iron lid into which a burl or the like can be inserted. Even if you notice the existence of the plug structure, those who do not know the structure do not know how to remove it. Moreover, a special tool is required to rotate the stopper structure. Therefore, it is not easy for anyone other than the specified person to remove the manhole iron cover.

[0006]

【Example】

 Hereinafter, an embodiment of a manhole iron lid plug structure according to the present invention will be described with reference to FIGS. As shown in FIGS. 1, 2 and 3, this manhole iron lid structure has a manhole iron lid 1 and a flat plate portion 2 a which can be fitted into a through hole 1 a provided in an outer peripheral portion of the iron lid. The plug member 2 and the compression coil spring member 3 that elastically supports the plug member 2 from below are provided. The spring member 3 is supported from below by a support plate 4 fixed to the lower portion 1b of the iron lid 1. The manhole iron cover 1 is provided with a pair of opposed through holes 1c having a predetermined width and length along the outer periphery of the through hole 1a. It extends to the lower end surface of 1b. An annular plug receiving surface 1d is provided on the lower surface of the manhole iron cover 1 along the outer periphery of the through hole 1a, and a bag-shaped burl insertion portion 1e having a predetermined wall thickness is connected to the through hole 1a. It has been established. Reference numeral 5 indicates a receiving frame for the manhole iron cover 1. As shown in FIGS. 4 and 5, on the lower surface of the flat plate portion 2a of the plug member 2, there is provided a pair of locking portions 2b that can be fitted into the through-grooves 1c of the iron lid 1 and project outwardly. Four hook recesses 2c are provided on the upper surface at equal intervals along the outer periphery of the flat plate portion 2a. It should be noted that the position, shape and number of the latching recess are not limited to this, and can be appropriately determined.

In order to assemble this manhole iron lid plug structure, the manhole iron lid 1 is placed with its upper surface facing down, and the flat plate portion 2a of the plug member 2 is placed in the through hole 1a of the iron lid 1. Mating. At this time, the position of the engaging portion 2b of the stopper member 2 is displaced so as not to be aligned with the through groove 1c of the iron lid 1, and the upper surface of the engaging portion 2b of the stopper member shown in FIGS. It is kept in contact with d. Next, the compression spring member 3 is placed on the plug member 2, and the support plate 4 is fixed to the end surface of the lower portion 1b of the iron lid 1 with screws while keeping the spring member 3 contracted, and the assembly is completed.

When opening the closed manhole iron cover, if it is locked by the lock device, it is first released. Next, the stopper member 2 is rotated by using an appropriate tool having a claw capable of engaging with at least two of the hooking concave portions 2c of the stopper member 2 at the tip. In this case, it is a secret to the general public, but to the concerned parties, the locking portion 2b of the stopper member 2 can be replaced with the transparent groove 1c of the iron lid 1 by rotating the concave portion 2c. It is known in advance whether they match. Therefore, if the position of the locking portion 2b of the plug member 2 is aligned with the position of the through groove 1c of the iron lid 1 by the operation of the person concerned, the locking portion 2b can be extremely easily removed from the plug receiving surface 1d of the iron lid 1. The spring member 3 is elastically repelled so that the locking portion 2b slides along the through groove 1c and is pushed up. In this state, the stopper member 2 is pushed down against the elastic force of the spring member 3, the burl or the like is inserted from the through hole 1a into the bag-shaped insertion portion 1e, and the iron lid 1 is lifted and removed.

The shape of the plug receiving surface 1d provided on the lower surface of the iron lid 1 may be a closed ring except the portion of the through groove 1c, or an open ring in which a part of the ring is omitted. Moreover, a packing can be inserted between the plug receiving surface 1d and the plug member 2 for deodorization or the like.

As is clear from the above description, according to the structure of the present invention, it is not easy for anyone other than the parties concerned to remove the manhole iron cover having this structure. That is, there is no hole on the surface of the iron lid into which a burl or the like can be inserted. Even if you notice the presence of the plug member, you do not know how to handle it. Moreover, the rotation angle required to release the stopper member from the restraint by the manhole cover is not known, and in order to rotate the stopper member, a claw suitable for the latching recess formed on the upper surface of the stopper member is used. You must have the special tools you have. Therefore, it is difficult for a specific person to remove the manhole iron cover.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a manhole iron cover having a manhole iron cover plug structure according to the present invention in a closed state.

FIG. 2 is a line II-I of the plug structure for the manhole iron cover shown in FIG.
It is a longitudinal cross-sectional view along I.

FIG. 3 is a line III- of the plug structure for a manhole iron lid shown in FIG.
It is a cross-sectional view along III.

FIG. 4 is a plan view of a stopper member of the manhole iron lid stopper structure shown in FIG. 1.

5 is an elevational view of the plug member shown in FIG. 4. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole iron lid 1a Through hole 1c Through groove 1d Plug receiving surface 2 Plug member 2a Flat plate part 2b Locking part 2c Locking recessed part 3 Compression spring member

Claims (1)

[Scope of utility model registration request] 1. A manhole iron lid having a through hole on an outer peripheral portion and a pair of through grooves provided so as to face each other along the outer periphery of the through hole, and the manhole can be fitted into the through hole. By a flat plate portion, a plug member provided on the lower surface of the flat plate portion so as to project outward, and having a pair of locking portions that can be fitted into the through groove, and a hooking concave portion on the upper surface, and the manhole iron lid. A compression spring member that is supported from below and elastically supports the plug member from below, and an annular plug receiving portion provided along the outer periphery of the through hole is provided on the lower surface of the manhole iron lid. Then, when the iron lid is closed, it abuts on the locking portion of the plug member to receive the plug member, and when the locking portion of the plug member is removed from the plug receiving portion of the manhole iron lid, the latch The stopper member is rotated through the concave portion for making the position of the engaging portion coincide with the through groove. A cap structure for a manhole iron cover.