JP2001055751A - Key cover for manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key cover for a manhole cover in which the key cover capable of rejecting an access from the outside is installed detachably at a keyhole for the manhole cover a control chip fitted to the key cover receives a release signal transmitted from the outside and permits the opening and closing of the manhole cover, the manhole can be locked surely and severely by simple constitution by releasing the key cover to the keyhole by a locking unit mounted on the key cover on the basis of a control signal transmitted from the control chip, only a permitted person or group can release the key easily and an electronic locking mechanism can be added easily to a locking device for the existing manhole having no electronic locking device. SOLUTION: Connecting terminals 12a, 12b are set up to a top plate 11 for the key cover A, a release signal transmitted from the outside through the connecting terminals 12a, 12b is received by a control chip 21 through primary and secondary coils 17, 18 fitted into the key cover A and an LC tuning circuit, and a locking unit 22 is constituted so as to release the key cover A to a keyhole for the manhole cover by a control signal transmitted from the control chip 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyhole for a manhole cover (including a handhole cover) provided in a manhole (including a handhole).

[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. A technique has been proposed in which a manager or an on-site builder reads the information with a reader in a management operation, thereby realizing speedy and accurate patrol, and efficiency of investigation, on-site inspection, construction, and witness.

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.

[0005] As an example of a locking device for preventing a manhole cover from being easily opened, a technique described in Japanese Patent Application Laid-Open No. 6-41998 discloses a cover member serving as a manhole cover as shown in FIG. A locking member 52 rotatably provided on the cover 51 engages with an engaging portion 54 of the receiving frame 53 to lock the lid 51, and is shown from an upper insertion hole 55 provided on the lid 51. The locking member 52 is inserted into the lower insertion hole 56 of the locking member 52 so as to be engaged therewith, and by pulling the tool, the locking member 52 is
The cover 51 can be opened by detaching from the cover.

[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.

[0010]

However, in the above-mentioned known example, the locking / unlocking operation must be performed while the worker keeps a low posture for locking or unlocking by inserting the key 60 into the locking body 58. Further, a key cover 58c for concealing the key hole in order to prevent dust from entering the key hole of the lock body 58 into which the key 60 is inserted so that the key 60 cannot be inserted.
Is tightened with a square wrench or the like, which increases the man-hours for locking / unlocking work, which is troublesome.

The present invention has been made to solve the above problems, and
The purpose is to provide a keyhole that can deny external access to the keyhole of the manhole cover so that it can be attached to and detached from the keyhole, and the control chip provided on the keyhole is unlocked when transmitted from the outside. A signal is received to allow opening and closing of the manhole cover, and based on the control signal sent from the control chip, the keyhole is unlocked to the keyhole by the locking unit provided on the keyhole, so that the manhole has a simple configuration. The lid can be locked securely and strictly, only authorized persons or groups can easily unlock it, and the electronic locking mechanism can be easily added to the existing manhole lid locking device without the electronic locking mechanism. A key cover of a manhole cover that enables the above is provided.

[0012]

A keyhole of a manhole cover according to the present invention for achieving the above object is provided detachably with respect to a keyhole provided in the manhole cover, and the keyhole can be accessed from outside. In the keyhole of the manhole cover that can refuse, a connection terminal exposed on the upper surface of the keyhole body and electrically connectable to an electric cable from the outside, housed inside the keyhole body, through the connection terminal A control chip that receives an unlocking signal transmitted from the outside and permits opening of the manhole cover, and is housed inside the key cover main body, and controls the key cover by a control signal sent from the control chip. A lock unit for unlocking the keyhole.

According to the present invention, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover body to supply power for operating the control chip and the locking unit from the outside. Can be done.

Also, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover main body, and an unlock signal is transmitted from the outside to the control chip, and the control chip permits the manhole cover to be opened, The lock unit can unlock the key cover with respect to the keyhole by the control signal sent from the control chip.

Another configuration of the keyhole of the manhole cover according to the present invention is such that the keyhole provided on the manhole cover is detachably provided so that external access to the keyhole can be denied. In the key cover, a connection terminal exposed to the upper surface of the key cover main body and capable of electrically connecting an electric cable from the outside, and housed inside the key cover main body,
A primary coil electrically connected to the connection terminal, a secondary coil housed inside the key cover main body, capable of being electromagnetically coupled to the primary coil, and housed inside the key cover main body, A control chip that receives an unlock signal transmitted from the outside through the connection terminal through the primary and secondary coils and permits the manhole cover to be opened, and the control chip is housed inside the key cover main body, A lock unit for unlocking the key cover with respect to the keyhole by a control signal sent from a chip.

Since the present invention is configured as described above, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover body, power is transmitted from the outside to the primary coil, and electromagnetic induction is performed on the primary coil. The power for operating the control chip and the locking unit can be supplied via the coupleable secondary coil.

A secondary coil capable of electromagnetically coupling to the primary coil by externally connecting an electric cable to a connection terminal exposed on the upper surface of the key cover body, transmitting an unlock signal to the primary coil from the exterior, and Via the control chip, the control chip permits opening of the manhole cover, and the locking unit can unlock the key cover with respect to the keyhole by the control signal sent from the control chip.

[0018] Further, in a state where an electric cable connected to a reader / writer terminal for performing authentication and identification of a person or a group permitted to unlock the manhole cover is connected to the connection terminal, the reader / writer terminal is connected to the terminal. When transmitting the unlocking signal, first, the reader / writer terminal performs authentication and identification of a person or a group permitted to unlock the manhole cover, and is then connected to the reader / writer terminal from outside. The reader / writer terminal transmits an unlock signal to the control chip via the primary and secondary coils while the electrical cable is connected to the connection terminal exposed on the upper surface of the key cover body, and controls the unlock signal. The locking unit unlocks the keyhole provided in the manhole cover only when the chip receives and permits the opening and closing of the manhole cover, so the locking of the manhole cover is secure and strict. It can be carried out in.

Further, in the case where a pin which can be inserted into the keyhole of the manhole cover and can protrude outward in the radial direction of the key cover main body can be engaged with an engaging portion provided on the manhole cover. Is inserted into the keyhole of the manhole cover, and the pin of the locking unit provided on the keyhole body is engaged with the engaging portion provided on the manhole cover to lock the keyhole. External access can be denied.

In addition, the electric cable connected from the outside to the reader / writer terminal is connected to the connection terminal exposed on the upper surface of the key cover body and controlled from the reader / writer terminal via the primary and secondary coils. Only when the control chip receives the unlock signal and permits the manhole cover to be opened, the locking unit pulls in the pin and engages with the engaging portion provided on the manhole cover. And cancel
Only the authorized person or group can access the keyhole in the manhole cover and unlock it easily by pulling the keyhole out of the keyhole.

[0021] Further, the keyhole can be easily attached simply by providing an engaging portion for engaging the pin of the keyhole in the keyhole provided in the existing manhole cover which has been conventionally used. Manhole cover and manhole facilities do not require major design changes and are economically favorable.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a keyhole of a manhole cover according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a sectional explanatory view showing an example of a single manhole cover to which a keyhole of a manhole cover according to the present invention is applied, and FIG. 2 is a diagram showing a spiral groove for opening and closing an arm of a locking portion of a locking device for a manhole cover. FIG. 3A is a cross-sectional explanatory view showing a state in which a key cover is inserted into a keyhole of a manhole cover, and FIG.
FIG. 4B is a cross-sectional explanatory view showing a state where the key cover is inserted into the keyhole of the manhole cover and locked.

FIG. 4 is an explanatory cross-sectional view showing the configuration of a first embodiment of a keyhole of a manhole cover according to the present invention, FIG. 5 is a block diagram showing the configuration of a control chip and a locking unit, and FIG. FIG. 7 is a perspective explanatory view showing a configuration of an external power supply for transmitting power for operating a control chip and a locking unit provided in the inside, and FIG. 7 transmits power for operating a control chip and a locking unit provided in a key cover. FIG. 8 is a diagram showing a circuit configuration of an external power supply for performing power supply, and FIG. 8 is a diagram showing a circuit configuration for receiving power from an external power supply connected to a connection terminal of a key cover by electromagnetic induction through primary and secondary coils. FIG. 9 is a diagram showing details of the circuit configuration inside the key cover.

FIG. 10 is a diagram showing how ID identification is performed by the personal identification means and the reader / writer terminal, and FIG. 11 is a flowchart showing the unlocking procedure.

First, the configuration of a first embodiment of a keyhole of a manhole cover according to the present invention will be described with reference to FIGS. FIG. 1 shows a configuration of a manhole cover (including a handhole cover) 1 provided in a manhole (including a handhole) serving as an opening through an underground object, an underground structure facility, and the ground. In the embodiment, an example of a single manhole cover 1 having only an outer cover is shown, but the present invention can be applied to a double-cover inner cover.

In FIG. 1, a manhole cover 1 is supported by a cover receiving frame 3 laid almost flush with the ground surface of the ground 2. The manhole cover 1 protects an underground buried object in a sewer, a large-sized iron cover that can open and close an opening through the underground structure facility and the ground, a sewage basin cover, and underground facility equipment and wiring in electric power and communication. Opening / closing iron cover for common ditch, power transmission iron cover, power distribution iron cover, buried conduit under the road surface for water supply and gas piping, and fire hydrant cover with a function as an opening and closing door connecting the auxiliary equipment and the ground, water control It is applicable as a valve lid, a partition valve lid, an air valve lid, a lid for gas piping, a water meter lid, and the like.

The manhole cover 1 is provided with locking means for locking the manhole cover 1 by mechanically engaging the manhole cover 1 with the cover receiving frame 3. A locking portion provided at the center of the manhole cover 1 is provided. By inserting a cover opening handle key (not shown) into the keyhole 1b of 1a and engaging with an engagement hole 4a of the turntable 4 shown in FIG. 2 arranged below the locking portion 1a, and rotating the key, An arm 5 fixed to a support shaft 5a that fits into the spiral groove 4b formed on the turntable 4 on the outer periphery of the locking portion 1a and that can move along the spiral groove 4b rotates with the rotation of the turntable 4. 4b, the arm 5 is guided by an arm guide 1c provided on the manhole cover 1, and the arm 5 is engaged with the lower surface of the engaging portion 3a of the lid receiving frame 3 to be locked. Closer to the locking portion 1a, which is the center of the manhole cover 1, than the cover receiving frame 3. It is adapted to be set to the unlocking position to avoid.

In FIGS. 1, 3 (a), 3 (b) and 4, A denotes a keyhole 1 provided on the manhole cover 1 shown in FIG.
b, which can be attached to and detached from the keyhole 1b and which can deny access to the keyhole 1b from the outside. The entirety of the keyhole is inserted into the keyhole 1b of the manhole cover 1. When A is inserted into the keyhole 1b of the manhole cover 1, the upper surface of the keyhole A and the upper surface of the keyhole 1b of the manhole cover 1 have a height dimension such that they are substantially flush.

As shown in FIG. 3, a projection 1d is provided on the surface of the keyhole 1b of the manhole cover 1 as an engaging portion projecting radially inward of the keyhole 1b. The key cover A is attached to the key hole 1b of the manhole cover 1 by being inserted into the key hole 1b through the space between the protrusions 1d.

As shown in FIG. 4, the key cover A of this embodiment has a stainless steel pipe having an outer diameter corresponding to the diameter of the keyhole 1b of the manhole cover 1 and a predetermined length in the axial direction. It has a key cover main body 6, and screw portions 6a, 6 having predetermined lengths in the axial direction are provided at both ends of the inner wall surface of the key cover main body 6.
b is formed. At a predetermined position of the key cover main body 6, a through hole 6c formed in a radial direction of the key cover main body 6 is provided.

The screw portion 6b formed on the bottom inner wall surface of the key cover main body 6 has an outer diameter corresponding to the inner diameter of the key cover main body 6, and has a disk-shaped stainless steel having a predetermined thickness in the axial direction. Bottom plate 7
The bottom plate 7 is fixed to the bottom of the key cover main body 6 by screwing a screw portion 7a formed on the outer peripheral surface of the key cover body 6. An engaging portion 7c for engaging a fastening tool when screwing the bottom plate 7 to the key cover main body 6 is provided on the lower surface 7b of the bottom plate 7.

A stainless ring-shaped member 8 having an outer diameter corresponding to the inner diameter of the key cover body 6 and having a predetermined length in the axial direction is fitted into the inside of the key cover body 6. The lower end surface 8a of the ring-shaped member 8 is in contact with the upper surface 7d of the bottom plate 7. At a predetermined position of the ring-shaped member 8, a through-hole 8b formed in the radial direction of the ring-shaped member 8 and communicating with the through-hole 6c of the key cover body 6 is provided.

Further, a disk-shaped partition plate 9 made of stainless steel having an outer diameter corresponding to the inner diameter of the key cover body 6 and having a predetermined thickness in the axial direction is inserted into the inside of the key cover body 6. It is in contact with the upper end surface 8c of the ring-shaped member 8. The partition plate 9 has lead wires 18a drawn from a secondary coil 18 described later,
A through hole 9b through which 18b is inserted is formed.

Further, a stainless steel ring-shaped member 10 having an outer diameter corresponding to the inner diameter of the key cover body 6 and having a predetermined length in the axial direction is fitted into the inside of the key cover body 6. The lower end surface 10a of the shaped member 10 is in contact with the upper surface 9a of the partition plate 9.

Further, a disc-shaped top plate 11 made of polycarbonate having an outer diameter corresponding to the inner diameter of the key cover body 6 and having a predetermined thickness in the axial direction is inserted into the inside of the key cover body 6. It is in contact with the upper end surface 10b of the ring-shaped member 10. In the center of the top plate 11, there is provided a through hole 11a to which connection terminals 12a and 12b which can be exposed to the outside and to which an electric cable can be electrically connected from the outside are fixed by screws or the like.
Cover made of plastic, rubber, etc. on the outside of a
A cover attachment groove 11b to which the cover 13 is attached is formed.

Further, a stainless steel ring having an outer diameter corresponding to the inner diameter of the key cover body 6 and a predetermined thickness in the axial direction is provided on a screw portion 6a formed on the upper inner wall surface of the key cover body 6. A screw portion 14 a formed on the outer peripheral surface of the ring-shaped member 14 is screwed and fastened, and the ring-shaped member 14 is fixed to an upper portion of the key cover main body 6. The ring-shaped member 14 is provided on the upper surface of the ring-shaped member 14.
An engagement portion 14b is provided for engaging a fastening tool when screwing into the key cover body 6.

When assembling the key cover A, first, the bottom plate 7 is screwed and fixed to the bottom of the key cover main body 6, and then the ring-shaped member 8 and the partition Board 9,
After the ring-shaped member 10 and the top plate 11 are sequentially inserted, the ring-shaped member 14 is screwed and fastened to the upper part of the key cover main body 6 so that the ring-shaped member 8, the partition plate 9, the ring-shaped member 10 and the top plate 11 Lock lid body 6
To be fixed integrally.

Inside the key cover A is a lower space 15 formed by a stainless steel bottom plate 7, a ring-shaped member 14 and a partition plate 9.
The upper space 16 formed by the partition plate 9 made of stainless steel, the ring-shaped member 10 and the top plate 11 made of polycarbonate is divided into two parts by the partition plate 9, thereby being strong and highly secure. Make up the container.

A flat primary coil 17 electrically connected to connection terminals 12a and 12b provided on the top plate 11 in an upper space 16 of the key cover A, and an electromagnetic induction A flat secondary coil 18 that can be coupled is housed,
A polycarbonate plate 19 between the partition plate 9 and the secondary coil 18
And a polycarbonate plate 20 is interposed between the secondary coil 18 and the primary coil 17.

A top plate is provided inside the lower space 15 of the key cover A.
A control chip 21 for receiving an unlocking signal transmitted from the outside through connection terminals 12a and 12b provided on 11 through primary and secondary coils 17 and 18 to permit the manhole cover 1 to be opened.
And the key cover A by the control signal sent from the control chip 21.
And a lock unit 22 for unlocking the keyhole 1b of the manhole cover 1.

On the lower surface 7 b side of the bottom plate 7, there is provided a microswitch 25 serving as detecting means for detecting that the key cover A is mounted on the keyhole 1 b of the manhole cover 1, and is pulled out from the microswitch 25. Lead wire 25b is bottom plate 7
And is guided to the lower space 15 inside the key cover A, and is electrically connected to a lead wire (not shown) guided to the control chip 21 via a connection terminal (not shown).

Then, the key cover A is inserted into the keyhole 1 of the manhole cover 1.
b, the actuator 25a of the micro switch 25 provided on the lower surface 7b side of the bottom plate 7 comes into contact with the surface of the lock 1e of the locking portion 1a of the manhole cover 1 and is pushed in, and the micro switch 25 is turned on. By doing so, it is detected that the key cover A is attached to the keyhole 1b of the manhole cover 1.

When assembling the key cover A, first,
The locking unit 22 and the control chip 21 are stored in the upper part of the bottom plate 7 and inside the ring-shaped member 8 with the bottom plate 7 fixed to the key body 6 and the ring-shaped member 8 fitted in the inside of the key body 6. . The control chip 21 and the locking unit 22 are integrally formed by applying electric wiring in advance, and are fixedly supported on the bottom plate 7 or the ring-shaped member 8 by fixing means (not shown).

Then, after electrically connecting the lead wire 25b drawn out of the microswitch 25 and a lead wire (not shown) led to the control chip 21, the partition plate 9 is inserted into the inside of the key cover body 6. The lower surface 9c of the partition plate 9 is placed in contact with the upper end surface 8c of the ring-shaped member 8. At this time, the lead wire drawn out of the control chip 21 and the locking unit 22
23a and 23b are inserted into the through holes 9b of the partition plate 9 and pulled out to the upper portion of the partition plate 9.

Then, a ring-shaped member is
10 and the lower end face 10a of the ring-shaped member 10 is
After being placed in contact with the upper surface 9a of the
The polycarbonate plate 19 is inserted into the inside 10 and is placed in contact with the upper surface 9 a of the partition plate 9. At this time, lead wire 23
a and 23b are formed through through holes 19 formed in the polycarbonate plate 19.
a and pulled out to the upper part of the polycarbonate plate 19.

The lead wires 18a, 18b drawn from the secondary coil 18 and the lead wires 23a, 23b drawn above the polycarbonate plate 19 are electrically connected by connecting terminals (not shown). The coil 18 is inserted into the inside of the ring-shaped member 10 and placed on the polycarbonate plate 19 in contact therewith.

Further, the polycarbonate plate 20 is inserted inside the ring-shaped member 10 and mounted on the secondary coil 18, and the primary coil 17 is further inserted inside the ring-shaped member 10 and mounted on the polycarbonate plate 20. I do.

Then, the lead wires 17a, 17b drawn from the primary coil 17 are connected to the connection terminals 12a,
12b and one of the connection terminals 12b.
a is electrically connected to the ring-shaped member 10 via a ground wire 24 to serve as a ground for the key cover A.

The stainless steel key cover body 6, bottom plate 7, ring-shaped member 8, partition plate 9 and ring-shaped member 10 are conductive, and the polycarbonate plates 19 and 20 and the polycarbonate top plate 11 It has electrical insulation properties.
Polycarbonate is also very tough and has impact strength and tensile strength, and has high strength that is stable over a wide range of temperatures from low to high temperatures.

Next, the top plate 11 is inserted into the inside of the key cover main body 6, and the lower surface of the top plate 11 is placed on the upper end surface 10b of the ring-shaped member 10 so as to be in contact therewith. It is fixed to the main body 6 by screwing. At this time, the lower surface of the ring-shaped member 14 presses the upper surface of the top plate 11, and the ring-shaped member 8, the partition plate 9, the ring-shaped member 10 and the top plate 11 are integrally fixed to the key cover body 6. .

Then, a cover 13 which is detachably attached to the cover mounting groove 11b of the top plate 11 is mounted on the cover mounting groove 11b so as to cover the connection terminals 12a and 12b, thereby connecting the connection terminals 12a and 12b with rainwater. , Earth and sand, dust, etc.
Rust and poor electrical contact are prevented from occurring on the connection terminals 12a, 12b, and the connection terminals 12a, 12b exposed on the surface of the top plate 11 are prevented.
A and 12b can be concealed to prevent mischief and damage.

By attaching a sealing member such as a sealing tape or an O-ring between the outer peripheral wall surface of the top plate 11 and the inner peripheral wall surface of the key cover main body 6 at least, the key cover A due to rainwater or the like is attached. Water tightness can be ensured.

The control chip 21 housed inside the key cover A is formed by integrally packaging an IC (semiconductor integrated circuit) chip, an LSI (semiconductor large-scale integrated circuit) chip, or the like. As shown in FIG. 5, a CPU 21a, a ROM 21b, and a RAM 21c are provided inside the chip 21.

The CPU 21a is a central processing unit that reads out programs and various data from a ROM 21b described later, performs necessary calculations and determinations, and performs various controls. Further, a solenoid driver 21d is connected to the CPU 21a. The CPU 21a is provided with a counter so that the time elapsed since the solenoid driver 21d is driven can be counted.

An LC tuning circuit 35 and a power storage unit 26 are connected to the CPU 21a, and power supplied from outside and transmitted from outside through connection terminals 12a and 12b provided on the top plate 11 of the key cover A. The unlock signal is frequency-separated by the LC tuning circuit 35 from the secondary coil 18 which receives or receives the unlock signal by electromagnetic induction coupling with the primary coil 17 and the power is transmitted to the power storage unit 26, and the unlock signal is transmitted to the CPU 21a.

The primary coil 17 is connected through the connection terminals 12a and 12b.
LC tuning circuit from secondary coil 18 by electromagnetic induction coupling with
The signal received at 35 is distinguished into an open signal and a closed signal by the FM modulation wave.

The ROM 21b is a read-only memory,
It stores various programs for the operation of the CPU 21a and various data necessary for collating a password or encryption transmitted from the outside. Further, the ROM 21b stores management data such as various piping diagrams and wiring diagrams buried and accommodated for roads and associated facilities and road private properties.

The RAM 21c is a random access memory, such as a working area in which the CPU 21a temporarily stores the data in the instruction and the operation result, and a buffer area in which various data such as a password and encryption transmitted from outside are stored. Consists of

The power storage section 26 receives power from the control chip 21 and the locking unit 22 from the outside and temporarily stores the power whenever the unlock operation of the key cover A is performed. However, this power storage unit 26
Is not a device that stores power for a long period of time, and the key cover A does not have a power source for locking / unlocking itself.

The locking unit 22 includes a solenoid driver 21
An electromagnetic solenoid 22a driven and controlled by d and a pin 22b projected or retracted by the electromagnetic solenoid 22a are provided, and the electromagnetic solenoid 22a is supplied with power required for driving by a power storage unit 26.

A pin driven by the electromagnetic solenoid 22a
3b, as shown in FIG. 3 (b), a protrusion 1d which protrudes outward in the radial direction of the key cover A and protrudes inward in the radial direction above the keyhole 1b of the manhole cover 1 and serves as an engaging portion. The solenoid driver 21 of the control chip 21 is provided so as to be engageable.
The electromagnetic solenoid 22a is driven by the control signal sent from d to project / retract the pin 22b.

6 and 7, reference numeral 27 denotes a control chip 21.
And an external power supply (hereinafter referred to as “UL (UnLock) power supply”) for externally supplying power to the power storage unit 26 of the locking unit 22, and a DC power supply in which a plurality of dry cells 27 a are connected in series is used for power transfer. When the button 27b is pressed, the DC voltage is applied to an inverter 27c which converts the DC into an AC.
AC power is output from c.

The connection plugs provided at the ends of the electric cables 27d and 27e connected to the output side of the inverter 27c are connected to the connection terminals 12a and 12b provided on the top plate 11 of the key cover A.
And then electrically connected to each other,
The alternating current output from 27c flows through the primary coil 17 to generate an alternating magnetic field, and the secondary coil 18 provided in the primary coil 17 so as to be capable of inductive coupling to the primary coil 17 generates an alternating magnetic field. An electromotive force is generated by the induction action.

Then, as shown in FIGS. 8 and 9, a rectifier 28 is connected to a secondary coil 18 via an LC tuning circuit 35 which is connected in parallel with a capacitor 35a. Is stored in a storage device 29 including a capacitor and the like. Reference numeral 29a denotes a display lamp which emits light when a predetermined amount of power required for operating the control chip 21 and the locking unit 22 is stored in the battery 29. FIG. 8 shows the configuration of the power storage unit 26 of the locking unit 22.
The 21 power storage units 26 have substantially the same configuration.

That is, as shown in FIG. 9, the secondary coil 18 is connected to a pair of terminals provided at a connection between the cathode and the anode of a bridge circuit composed of four diodes to be a rectifier 28, The AC power transmitted from the 17 to the secondary coil 18 by electromagnetic induction is smoothed by the rectifier 28 and converted from AC to DC, and is connected to another pair of terminals of the bridge circuit of the rectifier 28 where the cathodes are connected and the anodes are connected. The electric power is stored in the electric storage device 29 including the connected double capacitor.

A Zener diode 30 serving as a constant voltage diode is connected in parallel with the capacitor 29. by this,
A stable DC bias voltage can be applied to the bias voltage circuit of the control chip 21 connected in parallel to the battery 29.

Reference numeral 31 denotes a solenoid driver 21 of the control chip 21.
d, a transistor provided on the output side of the transistor 31. When a drive signal is input to the base of the transistor 31 from the solenoid driver 21d, the transistor 31 is turned on, and the electromagnetic solenoid 22 connected to the collector of the transistor 31 is turned on.
A DC current flows through the electromagnetic solenoid 22a to generate an electromagnetic force in the electromagnetic solenoid 22a, and the pin 22b provided on the electromagnetic solenoid 22a is drawn into the key cover A.

When the drive signal from the solenoid driver 21d is stopped, the transistor 31 is turned off, the current flowing through the electromagnetic solenoid 22a is cut off, and the pin 22b is protruded out of the key cover A by the urging means (not shown). Has become. 32 indicates that the electromagnetic solenoid 22a is ON / OF.
This is a reverse voltage prevention diode for preventing an impact voltage generated when performing F from adversely affecting the control chip 21.

In this embodiment, the pin 22b is moved in and out by driving the electromagnetic solenoid 22a. Instead of the electromagnetic solenoid 22a, a micro DC motor is connected to the collector of the transistor 31 and the micro DC motor is connected. May be configured so that the pin 22b is moved in and out by the rotation of.

Here, the connection terminals 12a, 12a
Although there is a risk of being destroyed or mischievous from the outside because b is exposed, the power system and signal system of the control chip 21 and the locking unit 22 are coupled by electromagnetic induction between the primary coil 17 and the secondary coil 18. Therefore, it is electrically isolated from the outside.

Normally, a DC power supply is used as a portable power supply. However, even if a DC power supply is connected to the primary coil 17, the DC power supply is short-circuited by the primary coil 17 so that a destructive operation cannot be performed. The DC power supply itself is damaged. Even if the connection terminals 12a and 12b are short-circuited, the primary coil
Neither 17 nor the secondary coil 18 has any trouble, and destruction is impossible.

FIGS. 10 and 11 show a reader / writer terminal (hereinafter referred to as an "R / W terminal") for authenticating and identifying a person who is permitted to unlock the manhole cover 1 or belongs to a group.
FIG. 13 is a diagram for explaining how to unlock key cover A using the key 33. At the time of unlocking, the operator operates the R / W terminal shown in Fig. 10.
33, carry the personal identification tag 34 and the UL power supply 27, and approach the target manhole cover 1.

FIG. 3B shows a state in which the key cover A is locked.
As shown in the figure, the lock 22 is locked in a state in which the pin 22b is fitted in the keyhole 1b of the manhole cover 1 and the pin 22b is protruded so as to engage with the protrusion 1d projecting inward in the upper radial direction of the keyhole 1b. ing.

Then, the operator firstly operates the top plate 11 of the key cover A.
Remove the cover 13 attached to the connection terminals 12a,
After exposing 12b, the electric cable 27d of the UL power supply 27,
The connection plug provided at the end of 27e is connected to the connection terminal 12a,
12b and electrically connected.

Then, the power transfer button 27b of the UL power supply 27
Press for about 10 seconds to connect the UL power
AC power is supplied to the primary coil 17 through the connection terminals 12a, 12b and the connection terminals 12a, 12b, and the AC power transmitted from the primary coil 17 to the secondary coil 18 by electromagnetic induction is passed through the LC tuning circuit 35 to the DC power And stored in the battery 29 (step S1 in FIG. 11).

Then, after confirming that the power for driving the control chip 21 and the locking unit 22 is sufficiently stored by turning on the display lamp 29a, the power transfer button 27b is released, and the electric cable 27d of the UL power supply 27 is released. , 27e are pulled out from the connection terminals 12a, 12b of the key cover A and removed.

Next, the connection plugs provided at the ends of the electric cables 33a, 33b connected to the signal transmission / reception section of the R / W terminal 33 are inserted into the connection terminals 12a, 12b of the key cover A, respectively, and electrically connected. Connecting.

Then, the operator's own personal identification tag 34 shown in FIG. 10 is inserted into a tag slot (not shown) of the R / W terminal 33 (step S2 in FIG. 11), and a four-digit password and a key are entered (step S2). Step S3 in FIG. 11).

At this time, the R / W terminal 33 allows the input of the personal identification number and the encryption up to six times, respectively, and if the answer is incorrect six consecutive times, it is displayed on the display 33c of the R / W terminal 33. "Access denied" is displayed and the personal identification tag 34
The self is frozen (step S10 in FIG. 11), and the personal identification tag 34
Unable to be used until reset at the issuing center that manages the issuance of.

In step S4 of FIG. 11, if the answer is correct within six times, the R / W terminal 33 checks the password and the code, and displays "PIN" and "PIN" on the display 33c. Is displayed, and in step S5 in FIG. 11, whether or not access to the keyhole 1b of the manhole cover 1 is determined based on the authentication content read from the personal identification tag 34.

If it is determined in step S5 of FIG. 11 that access is rejected, the access is rejected (step S11 of FIG. 11), and a message “access denied” is displayed on the display 33c of the R / W terminal 33.

In step S5, when it is determined that the access is permitted, the worker opens the manhole cover 1 or the road stored in the ROM 21b of the control chip 21 and the manhole cover without opening the manhole cover 1. R / W terminal to check only various information such as management data such as various plumbing diagrams and wiring diagrams etc. buried and stored in management auxiliary facilities and road private property
33 can be selected using the operation buttons provided.

Accordingly, in step S5, permission of access is determined, and when the operator operates the operation button of the R / W terminal 33 to execute a command to open the manhole cover 1, the R / W The unlock command and the personal authentication code are transmitted as an unlock signal from the terminal 33 to the control chip 21 (step S6 in FIG. 11).

The unlocking signal sent from the R / W terminal 33 is sent to the primary coil 17 through the electric cables 33a and 33b and the connection terminals 12a and 12b, and the secondary coil is sent from the primary coil 17 by electromagnetic induction coupling. 18 sent to the LC tuning circuit
After passing through 35, the data is temporarily stored in the RAM 21c of the control chip 21.

Then, in step S7 of FIG.
The U21a compares the unlocking signal for permitting access previously stored in the ROM 21b with the unlocking signal transmitted from the outside and stored in the RAM 21c, and is an unlocking signal from a person or group permitted to access. When it is determined, the solenoid driver 21d is controlled, the electromagnetic solenoid 22a is turned on by the electric power stored in the power storage unit 26, the pin 22b is pulled in, and the lock of the locking unit 22 is released (step S8 in FIG. 11). At this time, the engagement between the pin 22b and the protrusion 1d above the keyhole 1b of the manhole cover 1 is released, and the key cover A can be detached from the keyhole 1b of the manhole cover 1.

Then, the electric cable 33 of the R / W terminal 33
After the connection plugs a and 33b are pulled out and removed from the connection terminals 12a and 12b of the key cover A, the key cover A is pulled out from the keyhole 1b of the manhole cover 1 and detached, and a cover (not shown) is opened in the keyhole 1b of the manhole cover 1. The manhole cover 1 is unlocked by inserting a handle key or the like (step S9 in FIG. 11).

In step S7, the R / W terminal
If the comparison between the unlock signal sent from 33 and the unlock signal that permits access previously stored in the ROM 21b does not match, the access is rejected (step S12 in FIG. 11).

In step S8, the time during which the electromagnetic solenoid 22a pulls the pin 22b to unlock the lock unit 22 is set to about 10 seconds.
If the key cover A is not pulled out of the keyhole 1b of the manhole cover 1 within 0 seconds, the CPU 21a controls the solenoid driver 21d to turn off the electromagnetic solenoid 22a, and the pin 22b projects again and the upper portion of the keyhole 1b of the manhole cover 1 is opened. Projection 1
d, the key cover A is locked in the keyhole 1b of the manhole cover 1.

When locking the key cover A, the key cover A
Is dropped toward the keyhole 1b of the manhole cover 1, and the actuator 25a of the micro switch 25 provided on the lower surface 7b side of the bottom plate 7 of the key cover A comes into contact with the surface of the lock 1e and is pushed into the lock 1e. Switch 25 is ON
In response to this detection information, the CPU 21a controls the solenoid driver 21d to control the electromagnetic solenoid 22 of the locking unit 22.
is turned off, the pin 22b is engaged with the protrusion 1d above the keyhole 1b of the manhole cover 1, and the key cover A is locked to the keyhole 1b of the manhole cover 1.

At this time, the electric power temporarily charged in the power storage unit 26 in the previous operation by the above-mentioned method is used as the operating power supply of the locking unit 22. In this locking work, R / W terminal 3
3. The personal identification tag 34 is not required.

In step S5, access permission is determined, and the operator operates the operation button of the R / W terminal 33 to open the manhole cover 1 without opening the manhole cover 1.
When an instruction for inquiring various information such as management data such as various piping diagrams, wiring diagrams, and the like buried and stored in the road 21 and the management-related facilities and road private property stored in the ROM 21b of the R / W terminal 21 is issued, the R / W terminal An inquiry command and a personal authentication code are transmitted as an inquiry signal from the machine 33 to the control chip 21 via the primary and secondary coils 17, 18 and the LC tuning circuit 35 through the electric cables 33a, 33b and the connection terminals 12a, 12b. .

Then, the control chip 21 which has received the inquiry signal sent from the R / W terminal 33 temporarily outputs the inquiry signal to the RA.
The LC tuning circuit 35 stores target information from various information such as management data such as various piping diagrams and wiring diagrams etc. which are stored in the ROM 21b in advance and stored in the ROM 21b in advance and stored in the ROM 21b. Is transferred from the secondary coil 18 to the primary coil 17 by electromagnetic induction coupling through the connection terminal 12.
a, 12b and the electric cables 33a, 33b to the R / W terminal 33 for display on the display 33c of the R / W terminal 33.

After the worker has completed work, inspection, etc.,
Is locked in the keyhole 1b of the manhole cover 1 and the cover 13 is attached to the cover mounting groove 11b formed in the top plate 11 of the key cover A to cover the connection terminals 12a and 12b exposed on the surface of the top plate 11. I do.

According to the above configuration, electric cables 27 d and 27 e from the UL power supply 27 are externally connected to the connection terminals 12 a and 12 b exposed on the surface of the top plate 11 of the key cover A to transmit electric power to the primary coil 17. And a control coil via the secondary coil 18, which can be electromagnetically coupled to the primary coil 17, and the LC tuning circuit 35.
Electric power for operating the lock unit 21 and the lock unit 22 can be supplied.

Further, electric cables 33a, 33b from the R / W terminal 33 are externally connected to the connection terminals 12a, 12b exposed on the surface of the top plate 11 of the key cover A, and an unlock signal is transmitted to the primary coil 17. The primary coil 17 is transmitted to the control chip 21 via the secondary coil 18 that can be electromagnetically coupled to the primary coil 17 and the LC tuning circuit 35, and the control chip 21 permits the manhole cover 1 to be opened, and performs control. The lock unit 22 can unlock the key cover A with respect to the keyhole 1b by the control signal sent from the chip 21.

Further, the electric cables 33a and 33b connected to the R / W terminal 33 for performing authentication and identification of a person or a group authorized to unlock the manhole cover 1 are connected to the connection terminal 12 of the key cover A.
When the unlock signal is transmitted from the R / W terminal 33 while connected to the terminals a and 12b, first, the authentication of the person or group permitted to unlock the manhole cover 1 by the R / W terminal 33 is performed. After the identification, the R / W terminal 33 is connected with the electric cables 33a, 33b externally connected to the R / W terminal 33 to the connection terminals 12a, 12b exposed on the upper surface of the key cover A.
Transmits an unlock signal to the control chip 21 via the primary and secondary coils 17, 18 and the LC tuning circuit 35, and receives the unlock signal only when the control chip 21 receives the unlock signal and permits the opening and closing of the manhole cover 1. Since the locking unit 22 unlocks the key cover A with respect to the keyhole 1b provided in the manhole cover 1, the manhole cover 1 can be locked securely and strictly.

Further, a pin 22b which can protrude outward in the radial direction of the key cover A fitted toward the keyhole 1b of the manhole cover 1
Can be engaged with the protrusion 1d provided above the keyhole 1b of the manhole cover 1, so that the key cover A is fitted into the keyhole 1b of the manhole cover 1 and provided on the key cover A. The external access to the keyhole 1b of the manhole cover 1 can be denied by engaging and locking the protruding portion 1d provided on the keyhole 1b of the manhole cover 1 with the pin 22b of the locking unit 22.

Further, in a state where the electric cables 33a, 33b externally connected to the R / W terminal 33 are connected to the connection terminals 12a, 12b exposed on the upper surface of the key cover A, the R / W terminal 33 is primarily connected. The unlock signal is transmitted to the control chip 21 via the secondary coils 17 and 18 and the LC tuning circuit 35, and the unlock signal is received by the control chip 21 to lock the manhole cover 1 only when the opening of the manhole cover 1 is permitted. The unit 22 retracts the pin 22b to release the engagement with the protrusion 1d provided above the keyhole 1b of the manhole cover 1, and only the person or group permitted by pulling out the keyhole A from the keyhole 1b is a manhole. Keyhole 1b of lid 1
Can be easily unlocked by accessing.

Further, simply by providing an engaging portion such as a protrusion 1d for engaging with the pin 22b of the key cover A in the key hole 1b provided in the existing manhole cover 1 which has been conventionally used, the key cover can be easily formed. Since it is possible to adopt a structure in which A is attached, it is economically preferable that a large design change is not required for the manhole cover 1 or the manhole facility.

The apparatus according to the present embodiment is particularly suitable for the control chip 21.
Has a CPU 21a and a ROM 21b, so that different persons or groups to which access is permitted can be registered for each manhole (including a handhole).

That is, for example, only the group x can access the manhole (handhole) x, only the group y can access the manhole (handhole) y, and both the groups x and y can access the manhole (handhole) z. Settings that can be done are possible.

Next, a second embodiment of a keyhole of a manhole cover according to the present invention will be described with reference to FIG. FIG. 12 is an explanatory sectional view showing the configuration of a second embodiment of the keyhole of the manhole cover according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the first embodiment, as shown in FIG.
Although an example in which the connection terminals 12a and 12b for electrically connecting external electric cables are provided on the polycarbonate top plate 11 has been described, in the present embodiment, FIG.
As shown in FIG. 3, connection terminals 12a and 12b for electrically connecting an external electric cable to a stainless steel top plate 41 are provided.
Is provided.

In FIG. 12, a screw portion 6a formed on the upper inner wall surface of the key cover main body 6 has an outer diameter corresponding to the inner diameter of the key cover main body 6, and is made of stainless steel having a predetermined thickness in the axial direction. The screw portion 41a formed on the outer peripheral surface of the disc-shaped top plate 41 is screwed and fastened to fix the top plate 41 to the upper portion of the key cover body 6.

When the top plate 41 is also screwed onto the key cover main body 6, the lower surface of the top plate 41 is fixed to the upper end surface 10b of the ring-shaped member 10.
The ring-shaped member 8, the partition plate 9, and the ring-shaped member 10 are integrally fixed to the lock body 6.

An engaging portion 41b is provided on the upper surface of the top plate 41 for engaging a fastening tool when screwing the top plate 41 to the key cover body 6.
Is provided. A connection terminal at the center of the top plate 41 that can be exposed to the outside and that can be electrically connected to an electric cable from outside
There is provided a through hole 41c to which 12a and 12b are fixed by screws or the like, and a cover mounting groove 41d to which the cover 13 made of plastic or rubber is mounted outside the through hole 41c. .

The one connection terminal 12a is directly screwed to the conductive top plate 41 and is connected in an electrically conductive state.
The ground. The other connection terminal 12b is screwed to the top plate 41 with an electric insulating material 42 interposed therebetween.
Other configurations are the same as those of the first embodiment, and the same effects can be obtained.

Next, third and fourth embodiments of the keyhole of the manhole cover according to the present invention will be described with reference to FIG. 13 and FIG. FIG. 13 is a cross-sectional explanatory view showing a configuration of a third embodiment of a keyhole of a manhole cover according to the present invention, and FIG. 14 is a cross-sectional explanatory view showing a configuration of a fourth embodiment of a keyhole of a manhole cover according to the present invention. is there. In addition, components configured in the same manner as the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the first and second embodiments, the primary coil 17 is used.
And the secondary coil 18 is formed in a plate shape. In the third and fourth embodiments, as shown in FIGS. 13 and 14, the same bobbin 51 is provided with an electrical insulating material such as an insulating tape interposed therebetween. The primary coil 17 and the secondary coil 18 are overlapped and wound. Other configurations are configured in the same manner as the above embodiments, and the same effects can be obtained.

In each of the above-described embodiments, the partition plate 9 is sandwiched by the ring-shaped members 8 and 10 so as to be arranged and fixed inside the key cover main body 6, but the ring-shaped members 8 and 10 are omitted. The partition plate 9 may be directly welded to the key cover body 6. At this time, the control chip 2 housed inside the key cover body 6
1. The locking unit 22 may be attached from the lower part of the key cover main body 6, and the primary coil 17 and the secondary coil 18 may be attached from the upper part of the key lid main body 6, respectively.

In each of the above embodiments, the power and the unlock signal are transmitted to the control chip 21 via the primary coil 17 and the secondary coil 18.
In this configuration, the primary coil 17 and the secondary coil 18 are omitted, and power and an unlocking signal are directly transmitted from the connection terminals 12a and 12b to the control chip 21 and the locking unit 22.
It may be configured to transmit to 22. In this case, the partition plate 9 of the key cover main body 6 is omitted, and the primary coil 17 and the secondary coil 18 are omitted, so that a simple configuration can be achieved.

[0112]

Since the present invention has the above-described configuration and operation, according to the first aspect of the present invention, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover main body. Electric power for operating the control chip and the locking unit can be supplied from outside.

Also, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover main body, and an unlock signal is transmitted from the outside to the control chip, and the control chip permits the manhole cover to be opened. The lock unit can unlock the key cover with respect to the keyhole by the control signal sent from the control chip.

According to the second aspect of the present invention,
An electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover body, power is externally transmitted to the primary coil, and the control chip and the locking unit are connected to the primary coil through a secondary coil that can be electromagnetically coupled to the primary coil. Can be supplied with power to operate the.

Further, an electric cable is externally connected to the connection terminal exposed on the upper surface of the key cover body, an unlocking signal is transmitted from the outside to the primary coil, and a secondary coil which can be electromagnetically coupled to the primary coil is used. The control chip allows the manhole cover to be opened, and the locking unit can unlock the key cover with respect to the keyhole by the control signal sent from the control chip.

In addition, an electric cable connected to the reader / writer terminal for performing authentication and identification of a person or a group authorized to unlock the manhole cover is connected to the reader / writer terminal in a state where the electric cable is connected to the connection terminal. When transmitting the unlocking signal, first, the reader / writer terminal performs authentication and identification of a person or a group permitted to unlock the manhole cover, and is then connected to the reader / writer terminal from outside. The reader / writer terminal transmits an unlock signal to the control chip via the primary and secondary coils while the electrical cable is connected to the connection terminal exposed on the upper surface of the key cover body, and controls the unlock signal. The locking unit unlocks the keyhole provided in the manhole cover only when the chip receives and permits the opening and closing of the manhole cover, so the locking of the manhole cover is secure and strict. It can be carried out in.

Further, in the case where a pin which can be inserted into the keyhole of the manhole cover and can protrude outward in the radial direction of the key cover main body can be engaged with an engaging portion provided on the manhole cover. Is inserted into the keyhole of the manhole cover, and the pin of the locking unit provided on the keyhole body is engaged with the engaging portion provided on the manhole cover to lock the keyhole. External access can be denied.

In addition, control is performed from the reader / writer terminal via the primary and secondary coils while the electric cable connected from the outside to the reader / writer terminal is connected to the connection terminal exposed on the upper surface of the key cover body. Only when the control chip receives the unlock signal and permits the manhole cover to be opened, the locking unit pulls in the pin and engages with the engaging portion provided on the manhole cover. And cancel
Only the authorized person or group can access the keyhole in the manhole cover and unlock it easily by pulling the keyhole out of the keyhole.

Further, the keyhole can be easily attached simply by providing an engaging portion for engaging the pin of the keyhole in the keyhole provided in the existing manhole cover which has been conventionally used. Manhole cover and manhole facilities do not require major design changes and are economically favorable.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing an example of a single manhole cover to which a keyhole of a manhole cover according to the present invention is applied.

FIG. 2 is a diagram showing a configuration of a turntable in which a spiral groove for opening and closing an arm of a locking portion of a locking device for a manhole cover is formed.

3A is a cross-sectional explanatory view showing a state where the keyhole is inserted into the keyhole of the manhole cover, and FIG. 3B is a cross-sectional explanatory view showing a state where the keyhole is inserted into the keyhole of the manhole cover and locked. .

FIG. 4 is an explanatory sectional view showing a configuration of a first embodiment of a keyhole of a manhole cover according to the present invention.

FIG. 5 is a block diagram illustrating a configuration of a control chip and a locking unit.

FIG. 6 is a perspective explanatory view showing a configuration of an external power supply for transmitting power for operating a control chip and a locking unit provided in a key cover.

FIG. 7 is a diagram showing a circuit configuration of an external power supply for transmitting power for operating a control chip and a locking unit provided in a key cover.

FIG. 8 is a diagram showing a circuit configuration for receiving power from an external power supply connected to a connection terminal of a key cover by electromagnetic induction via primary and secondary coils.

FIG. 9 is a diagram showing details of a circuit configuration inside the key cover.

FIG. 10 is a diagram illustrating a state where ID identification is performed by a personal identification unit and a reader / writer terminal.

FIG. 11 is a flowchart showing an unlocking procedure.

FIG. 12 is an explanatory cross-sectional view showing a configuration of a second embodiment of a keyhole of a manhole cover according to the present invention.

FIG. 13 is an explanatory cross-sectional view illustrating a configuration of a third embodiment of the keyhole of the manhole cover according to the present invention.

FIG. 14 is an explanatory cross-sectional view illustrating a configuration of a fourth embodiment of a keyhole of a manhole cover according to the present invention.

FIG. 15 is a diagram illustrating a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Manhole cover, 1a ... Lock part, 1b ... Keyhole, 1c ...
Arm guide, 1d Projection, 1e Lock, 2 Ground, 3
... Lid receiving frame, 3a ... engaging portion, 4 ... rotary disk, 4a ... engaging hole,
4b: spiral groove, 5: arm, 5a: support shaft, 6: lock body, 6a, 6b: screw portion, 6c: through hole, 7: bottom plate, 7
a: screw portion, 7b: lower surface, 7c: engaging portion, 7d: upper surface,
7e: through hole, 8: ring-shaped member, 8a: lower end surface, 8b
... through-hole, 8c ... upper end surface, 9 ... partition plate, 9a ... upper surface, 9
b: through hole, 9c: lower surface, 10: ring member, 10a: lower end surface, 10b: upper end surface, 11: top plate, 11a: through hole, 11b ...
Cover mounting groove, 12a, 12b ... connection terminal, 13 ... cover, 14
... ring-shaped member, 14a ... thread part, 14b ... engagement part, 15 ... lower space, 16 ... upper space, 17 ... primary coil, 17a, 17b ...
Lead wire, 18… Secondary coil, 18a, 18b… Lead wire, 19
... Polycarbonate board, 19a ... Through hole, 20 ... Polycarbonate board, 21 ... Control chip, 21a ... CPU, 21b ... RO
M, 21c RAM, 21d solenoid driver, 22 locking unit, 22a electromagnetic solenoid, 22b pin, 23
a, 23b: Lead wire, 24: Ground wire, 25: Micro switch, 25a: Actuator, 25b: Lead wire, 26: Power storage unit, 27: UL power supply, 27a: Dry battery, 27b: Power transfer button, 27c: Inverter, 27d, 27e ... Electrical cable, 28
... Rectifier, 29 ... Capacitor, 29a ... Indicator lamp, 30 ... Zener diode, 31 ... Transistor, 32 ... Reverse voltage prevention diode, 33 ... R / W terminal, 33a, 33b ... Electrical cable,
33c: display, 34: personal identification tag, 35: LC tuning circuit, 35a: capacitor, 41: top plate, 41a: screw part, 41
b: engaging portion, 41c: through hole, 41d: cover mounting groove, A:
Lock case

Continuation of front page (72) Inventor Hyodo Nakamaro 1-22-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Inside Haneda Hume Tube Co., Ltd. (72) Inventor Hironori Haoka 1-22-2-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F term in Haneda Hume Tube Co., Ltd. (reference) 2D047 BB02 BB06 2E250 AA00 BB08 BB09 BB23 BB65 CC10 CC12 CC16 CC22 CC29 DD01 DD03 DD06 EE03 FF05 FF22 FF33 FF44

Claims (4)

[Claims] 1. A keyhole of a manhole cover which is detachably provided to a keyhole provided in a manhole cover and which can deny access to the keyhole from the outside. A connection terminal capable of electrically connecting an electric cable to the keyhole main body; a control for receiving an unlock signal transmitted from outside through the connection terminal and permitting the manhole cover to be opened; A key for a manhole cover, comprising: a chip; and a locking unit housed inside the key cover main body and unlocking the key cover with respect to the keyhole by a control signal sent from the control chip. lid. 2. A keyhole of a manhole cover which is provided detachably with respect to a keyhole provided in a manhole cover and which can deny access to the keyhole from outside, wherein the keyhole is exposed on an upper surface of the keyhole main body and externally. A connection terminal capable of electrically connecting an electric cable to the primary terminal; a primary coil housed inside the key cover main body and electrically connected to the connection terminal; a primary coil housed inside the key cover main body; A secondary coil that is electromagnetically inductively coupleable to the coil, and receives an unlock signal transmitted from the outside through the connection terminal, housed inside the key cover main body, via the primary and secondary coils, and A control chip that permits opening of the manhole cover, and a locking unit that is housed inside the key cover main body and unlocks the key cover with respect to the keyhole by a control signal sent from the control chip. A keyhole for a manhole cover, comprising: 3. An electronic cable connected to a reader / writer terminal for performing authentication and identification of a person or a group authorized to unlock the manhole cover is connected to the connection terminal from the reader / writer terminal. The key cover of a manhole cover according to claim 1 or 2, wherein the unlock signal is transmitted. 4. A pin which is fitted into a keyhole of the manhole cover and which can protrude outward in a radial direction of the key cover body can be engaged with an engaging portion provided on the manhole cover. The key cover of a manhole cover according to any one of claims 1 to 3.