JP2001172998A - Unlocking system of manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the unlocking system of a manhole cover capable of unlocking the manhole cover on the basis of a number, a code or the like without using a key, dispensing with the carrying and management of a key bundle, securing the maintenance of the facility of a manhole inside, storing unlocking code information to an ID chip installed on the circumference of the target manhole of the cover receiving frame or the like, and easily unlocking it by reading the unlocking code information by a non-contact reader/writer terminal machine. SOLUTION: The lever shaft 4 of a dial lock 3 provided integrally on the manhole cover 1 is engaged with an engaging member 7 provided on the cover receiving frame 2 to lock the manhole cover 1 on the cover receiving frame 2, and the manhole cover 1 is unlocked by reading the unlocking code information from the ID chip 11 provided on the manhole cover 1 by the R/W terminal machine 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole cover unlocking system in which a manhole cover (including a handhole cover) provided on a manhole (including a handhole) is locked.

[0002]

2. Description of the Related Art In recent years, with the advancement of road functions, the number of road occupation properties such as water and sewage, electric power, telephone, telecommunications, gas, and management-related facilities has increased, and management information has been diversified. The information gathering and work when performing construction work is complicated, complicated, and inefficient. For this reason, at present, construction and the like cannot be performed unless a plurality of maps, records, and the like of each road private property manager are collected and decoded.

In recent years, a road management system using computer mapping has been promoted, and an IC chip storing management data of roads, management facilities for the roads, and buried and housed articles for road occupation has been attached to a manhole cover, and the road has been constructed. In management work, managers and on-site installers read the information with a non-contact or contact type reader, so that quick and accurate patrols and on-site inspections, construction,
Techniques for realizing efficiency such as attendance have been proposed.

On the other hand, a conventional manhole cover locking device is:
A relatively simple locking mechanism, such as locking / unlocking by inserting a tool from outside into a keyhole provided in the manhole cover, stores management data stored buried and stored in roads and their management-related facilities and road-exclusive properties. The preservation of the IC chip was not sufficient.

As an example of a locking device for preventing the manhole cover from being easily opened, a technique disclosed in Japanese Patent Application Laid-Open No. 6-41998 (known example 1) is disclosed in FIG. A locking member 52 rotatably provided on a lid 51 serving as a lid engages with an engaging portion 54 of the receiving frame 53 to lock the lid 51, and an upper portion provided on the lid 51 is provided. A tool (not shown) is inserted from the insertion hole 55 to be inserted into and engaged with the lower insertion hole 56 of the locking member 52, and by pulling the tool, the locking member 52 is detached from the engaging portion 54 of the receiving frame 53, and the lid body is removed. 51 can be opened.

[0006] In a receiving shelf 57 provided below the upper insertion hole 55 of the lid 51, a lid (not shown) is inserted to prevent insertion of a tool (not shown).
A lock body 58 shown in FIG. A lock seat 59 having a head-shaped lock portion 59a is fixed to the receiving shelf 57, and a locking body 58 is inserted from an upper insertion hole 55 of the lid 51 to form a fitting formed on the lower surface of the locking body 58. The lock portion 59a of the lock seat 59 is placed on the receiving shelf 57 so as to be accommodated inside the chamber 58a, and the key 60 is inserted into the lock body 58 and turned to lock the lock piece 58b provided on the lock body 58. The lock body 58 is engaged with the lock portion 59 a of the lock seat 59 to lock the lock body 58 to the lid body 51.
A key cover 58c is provided on the upper part of the lock body 58 so as to be openable and closable.
Has been tightened against.

When opening the lid 51, first,
Release the key cover 58c with a square wrench, etc.
After opening 58c on the lid 51 from the upper insertion hole 55 of the lid 51,
The key 60 is inserted into the lock member 58 and rotated to retract the lock piece 58b from the lock portion 59a of the lock seat 59 to unlock the lock member 58.

After the locking member 58 is removed from the upper insertion hole 55 of the lid 51, a tool (not shown) is inserted from the upper insertion hole 55 of the lid 51 and inserted into the lower insertion hole 56 of the locking member 52 for engagement. Then, the locking member 52 is pulled by the tool so that the locking member 52
And the lid 51 is opened.

According to the above configuration, in the closed and locked state, the inside of the upper insertion hole 55 is substantially filled with the key cover 58c of the locking body 58. Unless the locking body 58 is removed, tools, rods and the like are used. Cannot be inserted.
Further, a key hole for inserting the key 60 into the lock body 58 is concealed by the key cover 58c, and the key cover 58c is locked by a square wrench or the like.
The manhole cover cannot be removed without special tools such as a square wrench and a key 60, so that the manhole cover can be prevented from being easily opened.

Further, Japanese Patent Publication No. 3-33857 (known example 2)
As disclosed in the above, the locking piece of the manhole cover is provided so as to be slidable in the horizontal direction with respect to the box, and the locking piece is fixed to the locking rod at the bottom of the box with a padlock. Some are locked.

[0011]

However, in the prior arts 1 and 2 in the above-mentioned prior art, however, a plurality of unlocking operators are required because the key 60 for unlocking the locking body 58 and the key (key) for unlocking the padlock are used. The user has to carry a key bundle in which the keys (keys) are bundled, and there is a problem that management of the key bundle is troublesome.

Further, the conventional key is not sufficient in security because a plurality of groups are grouped and unlocked by the same key. Further, if the user is familiar with the lock, the locked body 58 or the like can be locked using a wire or the like. Since the padlock could be opened relatively easily, there was concern about the maintenance of the equipment inside the manhole.

The present invention has been made to solve the above problems, and
The purpose is to unlock the manhole cover based on an unlocking code such as a number or symbol without using a key (key). The unlock code information can be stored in an ID chip installed around the target manhole such as a manhole cover or a lid receiving frame, and the unlock code information can be read by a non-contact reader / writer terminal. It is an object of the present invention to provide a manhole cover unlocking system which can be easily unlocked by using the same.

[0014]

A system for unlocking a manhole cover according to the present invention for achieving the above object is a system for unlocking a manhole cover locked by a dial lock, such as a manhole cover or a lid receiving frame. An ID chip which is installed around the target manhole, stores unlock code information such as a number and a symbol for unlocking the dial lock of the manhole cover, and is capable of transmitting the unlock code information; A contactless reader / writer terminal for receiving the unlock code information transmitted from the chip and notifying the unlock code information.

According to the above configuration, the unlock code information such as the number and the symbol stored in the ID chip installed around the target manhole such as the manhole cover or the cover receiving frame using the non-contact reader / writer terminal. The dial lock of the manhole cover can be unlocked in accordance with the unlock code information by reading and informing.

[0016] Thus, the unlocking person does not have to memorize a complicated unlocking code or carry a list of unlocking codes, and can easily unlock the unlocking code list. Can be prevented to improve security.

In addition, since the key can be unlocked without using a key, it is not necessary to carry and manage a key bundle, and terrorism or the like can be prevented from occurring, and the maintenance of equipment inside the manhole can be secured.

Also, an unlocking system that allows an authorized person to easily unlock even if the number of digits of unlocking codes such as numbers and symbols is increased and individual unlocking codes are assigned to a plurality of manhole covers. Can be built.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a manhole cover unlocking system according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing a manner of receiving unlock code information transmitted from an ID chip using a non-contact reader / writer terminal in a manhole cover unlocking system according to the present invention, and FIG. 2 is a manhole cover. FIG. 3 is a partially enlarged explanatory view showing a configuration of a dial lock provided integrally with the manhole cover, and FIG. 3 is provided so as to be rotatable on a lid receiving frame and can be engaged with a lever shaft of a dial lock provided integrally with a manhole cover. It is sectional explanatory drawing which shows the structure of an engagement member.

FIG. 4 is a cross-sectional view showing a state where the dial lock is locked, FIG. 5 is a cross-sectional view showing a state where the dial lock is unlocked, and FIG. 6 is a block diagram showing the structure of the ID chip. is there.

In FIG. 1, reference numeral 1 denotes a manhole cover (including a handhole cover) provided on a manhole (including a handhole) serving as an opening through an underground object, an underground structure facility, etc. and the ground. The manhole cover 1 is supported by a cover receiving frame 2 laid almost flush with the ground surface of the ground.

The manhole cover 1 includes a large iron cover, a sewage basin cover for opening and closing an underground buried object in a sewer, an underground structure facility, and an opening through the ground, equipment and wiring for underground facilities in electric power and communication. Fire hydrant functioning as an openable and closable iron cover for joints, power transmission iron cover, power distribution iron cover, underground pipes for water supply and gas pipes, and buried conduits and their attached equipment to protect the ground It can be applied as a lid, a water control valve lid, a partition valve lid, an air valve lid, a lid for gas piping, a water meter lid, and the like.

A dial lock 3 is provided integrally with the manhole cover 1, and the manhole cover 1 is locked to the lid receiving frame 2 by the dial lock 3. A hinge mechanism (not shown) is provided on the outer peripheral side of the manhole cover 1 facing the dial lock 3, and the manhole cover 1 is rotated around the hinge mechanism to be opened.

As shown in FIGS. 4 and 5, the dial lock 3 is slidably supported in the axial direction (left and right directions in FIGS. 4 and 5) by bearings 1a and 1b provided on the manhole cover 1. A lever shaft 4 is provided, and one end of the lever shaft 4 has a lever 4a standing upright.
Are formed.

The lever shaft 4 has a guide groove 5 in which both sides of the lever 4a are formed in the axial direction of the lever shaft 4.
4 and 5 so that the lever shaft 4 can slide along the guide groove 5 without rotating.

The projections 4b ₁ , 4b ₂ , 4 are formed on the predetermined circumferential surface of the lever shaft 4 at a predetermined pitch in the axial direction.
b ₃ , 4b ₄ , 4b ₅ , 4b ₆ , 4b ₇ (hereinafter, simply referred to as “projections 4b”) are erected in the same direction. Dials 6a ₁ , 6a ₂ , 6a ₃ , 6a ₄ , 6a ₅ , 6a ₆ , 6a
₇ (hereinafter simply referred to as “dial 6 a”) is rotatably inserted into the lever shaft 4.

At the center of each dial 6a, through holes 6b ₁ , 6b ₂ , 6 having a diameter corresponding to the outer diameter of the lever shaft 4 are provided.
b ₃ , 6b ₄ , 6b ₅ , 6b ₆ , 6b ₇ (hereinafter simply referred to as “through holes 6b”), through which the lever shaft 4 is inserted, and each dial 6a centering on the lever shaft 4 Are rotatably supported.

Further, when the lever shaft 4 moves rightward in FIG. 4, the inner diameter of each dial 6a comes into contact with each projection 4b formed on the lever shaft 4 to slide the lever shaft 4. Locking portions 6c ₁ and 6 for preventing movement
c ₂ , 6c ₃ , 6c ₄ , 6c ₅ , 6c ₆ , 6c ₇ (hereinafter simply referred to as “locking portion 6c”) are formed.

Between the dials 6a and between the dials 6a ₁
A spacer (not shown) having a slidable surface is interposed between the dial 6a and the bearing portion 1b, and between the dial 6a ₇ and the bearing portion 1a. It is held rotatably.

In this embodiment, ten different numbers 0-9 are displayed on the outer peripheral surface of each dial 6a, as shown in FIG. In addition to the numbers, English characters such as A, B, and C and various other symbols may be displayed, or a combination of these characters may be displayed. Further, a code such as two or more other numbers or symbols may be displayed on the surface of each dial 6a.

In this embodiment, seven dials 6
a, but may be configured using one or a plurality of other dials 6a. As a means for displaying a code such as a number or a symbol on the outer peripheral surface of each dial 6a, the code such as a number or a symbol may be displayed in an embossed manner, or may be engraved and displayed in reverse. Or a code such as a symbol may be printed, or a printed seal may be attached and displayed on the outer peripheral surface of each dial 6a.

Further, at a position facing a predetermined number to be unlocked formed on the outer peripheral surface of each dial 6a, a part of the locking portion 6c of each dial 6a is cut at the inner diameter portion of each dial 6a. Notches 6d ₁ , 6d ₂ , 6d ₃ , 6 which are continuous with the through holes 6b through which the protrusions 4b of the lever shaft 4 can pass when the lever shaft 4 moves rightward in FIG.
d ₄ , 6d ₅ , 6d ₆ , 6d ₇ (hereinafter simply “notch 6d”
Is formed.

Further, a projection 4b of the lever shaft 4 of the bearing portion 1a for supporting the lever shaft 4 slidably.
Notch 1a ₁ capable of passing through the projections 4b of the lever shaft 4 is formed in a position corresponding to.

On the other hand, as shown in FIGS. 2 and 3, the cover receiving frame 2 for receiving the manhole cover 1 is turned around the rotation shaft 7a in the direction indicated by the arrow in FIG. A movable engagement member 7 is provided.
Is configured to be rotatable while exerting a predetermined frictional force by a friction member (not shown) provided on the rotating shaft 7a.

In the drawing, reference numeral 8 denotes a waterproof cover made of rubber, synthetic resin or the like which is detachably provided on the manhole cover 1, and covers the dial lock 3, the lever 4a and the engaging member 7 over the whole. It covers to prevent infiltration of rainwater, dirt, dust, sandstone and the like.

Reference numeral 9 denotes an outer cover made of stainless steel or the like having rigidity to withstand a traffic load, and is configured to be rotatable about a rotary shaft 9a so as to be openable and closable with respect to the manhole cover 1.

An ID from which unlock code information such as the number and symbol of the dial lock 3 is read using the contactless reader / writer terminal (hereinafter referred to as "R / W terminal") 10 shown in FIG.
As shown in FIG. 6, the chip 11 is a semiconductor chip 1 integrally packaged such as an IC (semiconductor integrated circuit) chip or an LSI (large-scale semiconductor integrated circuit) chip.
2. The power storage unit 14 including a transceiver 13 having a coil-shaped antenna 13a and the like and a capacitor and the like are integrally covered with a mold or the like, and are embedded in the surface of the manhole cover 1. .

As shown in FIG. 6, a CPU 12a, a ROM 12b, and a RAM 12c are provided inside the semiconductor chip 12, and the CPU 12a stores a password such as a password or a code transmitted from an external R / W terminal 10. ID information is received and R /
A transceiver 13 that receives power transmitted from the W terminal 10 and a power storage unit 14 that stores power received from the outside are connected.

The CPU 12a is a central processing unit that reads out programs and various data from a ROM 12b, which will be described later, performs necessary calculations and determinations, and performs various controls. Also, ID information such as a password and a code transmitted by the unlocker using the R / W terminal 10 is received and temporarily stored in the RAM 12c, and the ID information and the collation information stored in the ROM 12b in advance are used. The ID information is compared and collated.

The ROM 12b is a read-only memory serving as a storage unit and stores unlock code information such as a number and a symbol for unlocking the dial lock 3, and various programs for operating the CPU 12a and external programs. Various data necessary for collating ID information such as a password and a code transmitted from the R / W terminal 10 are stored.

The ROM 12b stores R / W data as necessary.
Various messages to be transmitted to the R / W terminal 10 and to be displayed on a display 10a, which is a notification means and a display means, by transmitting to the R / W terminal 10 a result of the authentication identification by collating the ID information such as the password and the encryption transmitted from the terminal 10. Is stored. Also, ROM
12b stores management data such as various piping diagrams, wiring diagrams, and the like buried and accommodated for roads and their management-related facilities and road private properties.

The RAM 12c is a random access memory serving as a storage unit. The CPU 12a has a working area for temporarily storing data in an instruction and a calculation result, and an external R / C.
It comprises a buffer area and the like for storing various data such as a password transmitted from the W terminal 10 and ID information such as encryption.

The power storage unit 14 serving as power storage means receives the power of the semiconductor chip 12 from the outside in a non-contact manner and temporarily stores the power. The power received by the electromagnetic induction from the antenna 13a via the transceiver 13 is used. Is stored by a capacitor or the like.

When unlocking the dial lock 3, the R / W terminal 10 uses the R / W terminal 10 to transmit ID information such as a password and a code and a browsing signal to the manhole cover 1. Is transmitted to the ID chip 11 provided in the.

On the ID chip 11 side, information such as a password and an encryption code
The D information and the browsing signal are received by the transceiver 13, and the CPU 12a receives the ID information such as a password and a code stored in the ROM 12b and the ID and the code transmitted from the R / W terminal 10. R only when the ID information matches
The unlock code information stored in the AM 12c is transmitted to the R / W terminal 10 via the transceiver 13, and the unlock code information is displayed on the display 10a of the R / W terminal 10.

In the above configuration, when locking the manhole cover 1, first, as shown in FIGS. 1 and 2, the outer cover 9 is opened to detach the waterproof cover 8, and as shown in FIGS. 2 and 3. As described above, the engagement member 7 is rotated about the rotation shaft 7a to stand up as shown by the solid lines in FIGS.

Then, all the dials 6a of the dial lock 3 are set to the unlocking number positions, and the notches 6d of the all dials 6a are set.
Is aligned with the position of the projection 4b of the lever shaft 4, the lever 4a is gripped, the lever shaft 4 is slid to the left in FIG. 4, and the lever shaft 4 is inserted into the engagement hole 7b of the engagement member 7. Thereafter, the end 4c of the lever shaft 4 is inserted into the engagement hole 1c of the manhole cover 1.

At this time, as shown in FIG. 4, each projection 4b of the lever shaft 4 is located on the left side of FIG. 4 with respect to the locking portion 6c of each dial 6a, and each dial 6a is centered on the lever shaft 4. It is arranged rotatably.

Then, each dial 6a is set at a position other than the unlocking number, and the locking portions 6c of all the dials 6a are matched with the positions of the projections 4b of the lever shaft 4, so that the manhole cover 1 is attached to the dial lock 3. Can be locked.

Thereafter, the waterproof cover 8 is attached to the manhole cover 1 to cover the dial lock 3, the lever 4a and the engaging member 7 entirely, and the outer cover 9 is closed. The outer cover 9 may be locked as necessary, not shown.

On the other hand, when unlocking the manhole cover 1,
The outer cover 9 is opened and the waterproof cover 8 is detached, and as shown in FIG. 1, ID information such as a personal identification number or a code is input from the position away from the manhole cover 1 by using the input key 10b by the R / W terminal 10. Is input to the ID chip 11 to transmit ID information such as a password and an encryption code and a browsing signal.

The transmitted ID information such as a password and an encryption code and the browsing signal are temporarily stored in a RAM 12 c provided on the semiconductor chip 12 of the ID chip 11. At this time, electric power is transmitted simultaneously with the ID information and the browsing signal, and is stored in the power storage unit 14.

On the other hand, the display 10a of the R / W terminal 10
The input ID information is displayed at the top, and the input ID information can be confirmed.

The R / W terminal 10 and the semiconductor chip 12 exchange ID information such as a password and an encryption code, and exchange ID information such as a password and an encryption code stored in the ROM 12b of the semiconductor chip 12 in advance. The unlock code information can be browsed only when the password and the encryption code transmitted from the R / W terminal 10 match.

In this case, “access denied” or the like stored in the ROM 12b to notify the result of the authentication identification by collating the ID information such as the personal identification number and the encryption transmitted from the R / W terminal 10. Various messages of the R / W terminal
10 to be displayed on the display 10a.

Accordingly, even if the R / W terminal 10 is stolen or the like and reaches the hands of an outsider, if the outsider does not know the ID information such as the password or the encryption code, the unlock code information is obtained. Cannot be accessed, and security is improved.

Referring to the unlocking code information displayed on the display 10a of the R / W terminal 10, all the dials 6a of the dial lock 3 are set to the unlocking number positions, and the notches 6d of the all dials 6a are levered. The position of the protrusion 4b of the shaft 4 is matched, the lever 4a is gripped and the lever shaft 4 is slid rightward in FIG. 5 so that the end 4c of the lever shaft 4 is engaged with the engagement hole 1c of the manhole cover 1 and the engagement. Engagement hole 7 of member 7
The manhole cover 1 can be unlocked by pulling out until it comes out of the b.

When the engaging member 7 hinders the elevating operation in the manhole, it is suspended as shown by the broken line in FIGS. 2 and 3, and when the manhole cover 1 is locked, the solid line in FIGS. Use standing up as shown by.

In the present embodiment, the engaging member 7 is
Although an example in which it is configured to be rotatable about a has been described, a fixed type engagement member may be used. Although the case where the engaging member 7 is provided on the lid receiving frame 2 has been described, the engaging member 7 may be provided on a fixing member other than the lid receiving frame 2 fixed to the ground near the manhole.

The ID chip 11 may be installed at a position other than the manhole cover 1 at a predetermined position around the cover receiving frame 2 or a target manhole.

The notifying means may be configured to notify the unlock code information by voice.

When access permission is determined by communication between the R / W terminal 10 and the ID chip 11, the operator unlocks the manhole cover 1 or without unlocking the manhole cover 1. The R / W terminal 10 determines whether to inquire only various information such as management data such as various piping diagrams, wiring diagrams, and the like stored in the ROM 12b of the semiconductor chip 12 and the roads and the facilities associated with the management and the road private property. Can be selected by the operation buttons provided in the.

According to the above configuration, the unlock code such as the number or symbol stored in the ID chip 11 installed around the target manhole such as the manhole cover 1 or the cover receiving frame 2 using the R / W terminal 10. The information is read and reported, and the dial lock 3 of the manhole cover 1 can be unlocked according to the unlock code information.

Thus, there is no need for the unlocking person to memorize a complicated unlocking code or to carry a list of unlocking codes, and the unlocking can be easily performed, and the loss or theft of the unlocking code list can be prevented. Can be prevented to improve security.

Further, since the key can be unlocked without using a key, it is not necessary to carry and manage a key bundle, and it is possible to prevent terrorism or the like beforehand and to secure the maintenance of the equipment inside the manhole.

Also, an unlocking system that allows an authorized person to easily unlock even if the number of digits of the unlocking code such as a number or a symbol is increased and individual unlocking codes are assigned to the plurality of manhole covers 1. Can be constructed. That is, it is possible to construct a locking system in which a large number of manhole covers 1 are individually changed in the unlocking code and each one is different, and security can be improved.

In the above embodiment, the case where the dial lock 3 is provided integrally with the manhole cover 1 has been described.
As another configuration, the dial lock 3 is provided integrally with the lid receiving frame 2, or the dial lock 3 is provided integrally with a fixing member other than the lid receiving frame 2 fixed to the surrounding ground where the manhole is provided. 7 may be provided on the manhole cover 1 side.

In the above embodiment, the dial lock 3 is an example of the configuration of a rotary dial lock which unlocks the dial 6a by aligning the position of the notch 6d of each dial 6a with the position of the projection 4b of the lever shaft 4. However, as another rotary dial lock, a plurality of codes such as different numbers and symbols are displayed around the rotating body or the rotating body, and the rotating body is alternately rotated left and right by a predetermined angle. It may be an unlocking type dial lock or a push button dial type dial lock in which a plurality of codes such as different numbers or symbols are displayed on a plurality of push buttons.

[0069]

Since the present invention has the above-described structure and operation, it can be stored in an ID chip installed around a target manhole such as a manhole cover or a lid receiving frame using a non-contact reader / writer terminal. The unlock code information such as the number or the symbol is read and notified, and the dial lock of the manhole cover can be unlocked according to the unlock code information.

Thus, there is no need for the unlocker to memorize complicated unlock code information or to carry the unlock code list, and the unlock can be easily performed, and the unlock code list is lost or stolen. Can be prevented and security can be improved.

Further, since the key can be unlocked without using a key, it is not necessary to carry and manage a key bundle, and it is possible to prevent terrorism or the like from occurring and to secure the maintenance of facilities inside the manhole.

Further, there is provided an unlocking system in which an authorized person can easily unlock even if individual unlocking codes are assigned to a plurality of manhole covers by increasing the number of digits of unlocking codes such as numbers and symbols. Can be built.

That is, it is possible to construct a locking system in which a large number of manhole covers are individually changed in unlocking codes and each one is different.
Security can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing how a noncontact reader / writer terminal receives unlock code information transmitted from an ID chip in an unlocking system for a manhole cover according to the present invention.

FIG. 2 is a partially enlarged explanatory view showing a configuration of a dial lock integrally provided on a manhole cover.

FIG. 3 is a sectional explanatory view showing a configuration of an engaging member rotatably provided on a lid receiving frame and capable of engaging with a lever shaft of a dial lock integrally provided on a manhole cover.

FIG. 4 is an explanatory sectional view showing a state in which the dial lock is locked.

FIG. 5 is an explanatory sectional view showing a state where the dial lock is unlocked.

FIG. 6 is a block diagram illustrating a configuration of an ID chip.

FIG. 7 is a diagram illustrating a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Manhole cover, 1a ... Bearing part, 1a1 _... Notch part, 1
b: bearing portion, 1c: engagement hole, 2: lid receiving frame, 3: dial lock, 4: lever shaft, 4a: lever, 4b, 4
b ₁ , 4b ₂ , 4b ₃ , 4b ₄ , 4b ₅ , 4b ₆ , 4b ₇ ... projections, 4c ... ends, 5 ... guide grooves, 6a, 6a ₁ , 6
_{a 2, 6a 3, 6a 4} , 6a 5, 6a 6, 6a 7 ... dial,
_{6b, 6b 1, 6b 2,} 6b 3, 6b 4, 6b 5, 6b 6, 6
b ₇ ... through _{hole, 6c, 6c 1, 6c 2} , 6c 3, 6c 4, 6
_{c 5, 6c 6, 6c 7} ... locking _{portion, 6d, 6d 1, 6d 2} , 6
_{d 3, 6d 4, 6d 5} , 6d 6, 6d 7 ... notch, 7 ... engaging member, 7a ... pivot shaft, 7b ... engaging hole, 8 ... waterproof cover,
9 ... Outer cover, 9a ... Rotating shaft, 10 ... R / W terminal, 10a
... Display, 10b ... Input keys, 11 ... ID chip, 12
... Semiconductor chip, 12a ... CPU, 12b ... ROM, 12c ...
RAM, 13: transceiver, 13a: antenna, 14: power storage unit

Continuation of front page (72) Inventor Masashi Mizutani F-term (reference) 2D047 BB01 2E250 AA00, 1-22-2 Nishi Shinjuku, Shinjuku-ku, Tokyo

Claims (1)

[Claims] An unlocking system for a manhole cover locked by a dial lock, which is installed around a target manhole such as a manhole cover or a lid receiving frame, and includes a number for unlocking the dial lock of the manhole cover. An ID chip capable of storing unlock code information such as a symbol and transmitting the unlock code information; and an ID chip receiving the unlock code information transmitted from the ID chip and reporting the unlock code information. A manhole cover unlocking system, comprising: a contact reader / writer terminal.