JP2003286785A - Crescent with crime prevention function, and crime prevention system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contribute to the prevention of crime by avoiding a reaction of an oscillation circuit by the action of an illegal operation detection switch as long as the crescent main body is normally adhered to a window frame. <P>SOLUTION: This crime prevention circuit comprises an opening and closing operation detection switch 21 installed to the crescent main body 2 for detecting a switching from a closed position to an open position of the operation detection switch 21, an illegal operation detecting switch 22 detecting the removal of the crescent main body 2 from the window frame, and an oscillation circuit 19 generating a radio wave which is installed to the crescent main body 2 and operates based on a signal at least from either one of the opening and closing operation detection switch 21 and the illegal operation detection switch 22. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a crescent with a crime prevention function and a crime prevention system.

[0002]

2. Description of the Related Art Crescent with a crime prevention function and a crime prevention system having a function for preventing the crime of invading a house by illegally opening a window frame such as an aluminum sash.
A wireless door tightening confirmation system as disclosed in JP-A-7-134790 is already known.

In this wireless door tightening confirmation system, a magnet is attached to the tip of an operation handle for opening and closing provided on a crescent body attached to one window frame, while the other window frame adjacent to this operation handle is attached. Attach a wireless transmitter with a built-in reed switch that operates with a magnet, and activate the alarm device by activating the wireless transmitter by detecting the movement of the magnet that accompanies the lock / unlock operation of the operating handle. Was configured as.

[0004]

Therefore, it is necessary to dispose a wireless transmitter with a built-in reed switch on the sash frame independently of the crescent body, which has a harmful effect on the appearance of the window frame. Also, since the wireless transmitter is installed separately from the sash frame, it is clear from the outside that the sash frame has a crime prevention function through the transparent glass, and an unauthorized intruder can detect this. It was possible to evade it and break into another window frame or door, or break the window glass to remove the wireless transmitter or crescent. In addition, because it is necessary to separate and deploy an independent wireless transmitter separately from the crescent, the number of elements that make up the security system increases,
There has been a problem that the cost of laying a security system is relatively high.

Moreover, unless the relationship between the relative mounting positions of the crescent body and the wireless transmitter, that is, the relative positional relationship between the magnet and the reed switch is strictly defined, the wireless transmitter is operated at an appropriate timing. Since it is not possible to do so, it was troublesome that the installation work of the wireless transmitter and the crescent body at the time of construction had to be done precisely.

[0006]

[Patent Document] Japanese Patent Application Laid-Open No. 7-134790 Japanese Patent Application Laid-Open No. 10-88877
Japanese Patent Application Laid-Open No. 2000-54693 Japanese Patent Application No. 59-67643 Micro Film Japanese Application No. 52-106372 Micro Film Japanese Patent Application Laid-Open No. 64-1797
8 gazette Registered utility model No. 3061836 gazette JP 10-292702 gazette JP 9-189156 gazette

[0007]

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art described above, to eliminate the need for an independent wireless transmitter on the window sill, to be unobtrusive and to have a small number of security system components. , Crescent with crime prevention function and crime prevention system that can be easily installed during construction.

[0008]

In order to achieve the above object, a crime prevention crescent according to the present invention has a locking piece provided on one window frame by switching an operating handle between an open position and a closed position. And the engaging member of the crescent body provided on the other window frame are engaged and disengaged to lock / lock the window frame.
In an unlocking crescent, an opening / closing operation detection switch, which is provided in the crescent body and detects switching of the operation handle from a closed position to an open position,
An tampering detection switch that detects removal of the crescent body from the window frame, and the crescent body is provided, and operates based on a signal from at least one of the open / close operation detection switch and the tampering detection switch. A transmission circuit for transmitting a radio wave, and the operation handle is connected to the transmission circuit as an antenna.

Since the transmission circuit and the open / close operation detection switch are integrally provided inside the crescent body as described above, it is not necessary to provide a wireless transmitter independent of the crescent body on the window frame, and the window frame The aesthetics are improved.
Moreover, it is virtually impossible for an outside intruder to discover that the Crescent body has a crime prevention function, and there is also a problem that the intruder avoids this and tries to invade from another window frame or door. Will be resolved.

Further, at least one of the opening / closing operation detection switch and the illicit operation detection switch is turned on.
, That is, if the operation handle is operated,
When the Crescent body is removed from the window frame, the transmission circuit is automatically activated. Therefore,
As long as the crescent body is properly fixed to the window frame, the tampering detection switch will not operate and the transmission circuit will not react.

Further, since the number of independent elements required for constructing the security system is reduced, an increase in cost when installing the security system is suppressed.

Further, since the opening / closing operation detection switch is incorporated in the crescent body itself, unlike the prior art in which a reed switch for detecting a steering wheel operation is provided on the window frame independently of the crescent body. Also, strict positioning work of the device at the time of construction becomes unnecessary.

Further, the operation handle is electrically insulated and attached to the crescent body, and the operation handle is connected to the transmission circuit as an antenna.

Therefore, since the impedance of the locking piece and the window frame is not added to the operation handle that functions as an antenna when the transmission circuit operates, the impedance of the operation handle as an antenna is suppressed to a low value, and the impedance is small. It becomes possible to output radio waves with various power consumption.
Since there is no change in impedance, a stable transmission state can be secured.

Further, the opening / closing operation detection switch has a protrusion provided on a rotary cam that rotates with the rotation of the operation handle and a lead pressed by the protrusion, and the engagement member of the operation handle. It is desirable that the lead be pressed by the protrusion and the switching of the operation handle be detected at the timing when the lead is released from the locking piece.

Therefore, the opening / closing operation detection switch detects the rotational position of the operation handle immediately before the engagement member is disengaged from the locking piece, and activates the transmission circuit only at the moment when this detection is performed. Power consumption due to the operation of the circuit can be small.

Further, it is desirable that the opening / closing operation detection switch is biased by a coil spring from a neutral position toward the open position or the closed position. This prevents the operation handle for rotating the opening / closing operation detection switch from being stopped inadvertently at the neutral position.

The crime prevention system according to the present invention comprises the above-described crime prevention crescent and an alarm device which operates by receiving radio waves from the transmission circuit of this crime prevention crescent.

Since the alarm device is configured as a unit separate from the crime prevention crescent, it can be installed in any place inside or outside the house as long as the radio wave from the transmitting circuit can reach it.

[0020]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a crime prevention crescent 1 of an embodiment to which the present invention is applied, and FIGS. 2 to 3 and 5 show a crime prevention crescent 1 following an assembly process of the crime prevention crescent 1. 2 is a side view and a cross-sectional view showing the internal structure of FIG.

The crime prevention crescent 1 of this embodiment is
As shown in FIG. 1, it is generally constituted by a crescent body 2 and a locking piece 3.

Of these, the crescent body 2 is fixedly provided on one of the window frames 4 as shown in FIG. 1, and is engaged with the locking piece 3 fixed to the other window frame 5. When,
An operation handle 7 for engaging and disengaging the engagement member 6 with respect to the locking piece 3 is provided.

The operating handle 7 is made of a conductive material such as aluminum alloy, and the engaging member 6 formed of a tapered arc-shaped projection is integrally formed with the operating handle 7 as shown in FIG. ing.

The back side of the operating handle 7 is shown in FIG.
As shown in FIG. 2 (b), a shaft 8 made of an electrically conductive material is projected and fixed, and a through hole is formed in the thick portion of the central portion of the casing 9 that constitutes the main portion of the crescent body 2. 10 is rotatably supported by a stepped sleeve 11 made of an insulating material such as synthetic resin.

In consideration of mechanical strength, the casing 9 is made of a metal material equivalent to that of the operating handle 7, and the casing 9 and the operating handle 7 are securely provided with a stepped sleeve 11 serving as an insulating material. It is insulated.

A disk-shaped rotary cam 12 made of a conductive material is provided at the tip of the shaft 8 with respect to the shaft 8 as shown in FIGS. 3 (a) and 3 (b). It is fixed integrally in a non-rotatable state. Further, the rotary cam 12 is provided with an arc-shaped elongated hole 13 extending in the circumferential direction, and the rotational position regulating pin 14 is planted in the thick portion of the central portion of the casing 9 and protrudes into the elongated hole 13. The rotation limit of the rotary cam 12 and the operation handle 7 with respect to the casing 9 is regulated by the engagement relationship between the rotary cam 12 and the elongated hole 13.

The operating handle 7 is rotated 180 ° counterclockwise from the completely closed position shown in FIG. 3 (a) with reference to the directionality in FIG. 3 (a), or from the completely closed position shown in FIG. 18 clockwise with reference to the directionality in Figure 1.
It can rotate in the range of 0 °. Rotational position control pin 14
Is made of an insulating material such as synthetic resin,
The rotary cam 12 and the casing 9 are not electrically connected to each other via the rotational position regulating pin 14. Also, the rotating cam 12
Since the collar portion of the stepped sleeve 11 is interposed between the rear surface of the rotary cam 12 and the thick portion of the casing 9, the rear surface of the rotary cam 12 does not directly contact the casing 9 and become conductive.

As shown in FIGS. 3 (a) and 3 (b), a pin 15 made of an insulating material such as synthetic resin is integrally fixed to the surface of the rotary cam 12 so as to be inside the casing 9. The other end of the coil spring 17 whose one end is locked to the planted spring locking pin 16 is locked.

The coil spring 17 functions as a fulcrum crossing spring for urging the operation handle 7 to rotate, and when the rotation position of the operation handle 7 with respect to the casing 9 is near the closed position, that is, the rotation of the operation handle 7. When the position is in the range of 0 ° to 90 ° counterclockwise with reference to the fully closed position of FIG. 3A, the operation handle 7 is turned to the fully closed position and the clockwise direction of FIG. When the rotational position of the operation handle 7 with respect to the casing 9 is in the rotational position near the open position, that is,
When the rotation position of the operation handle 7 is in the range of 90 ° to 180 ° in the counterclockwise direction with reference to the completely closed position of FIG. 3A, the operation handle 7 is turned to the completely opened position as shown in FIG. Energize counterclockwise in a).

The fulcrum-over spring function of the coil spring 17 prevents the operation handle 7 from stopping carelessly at the neutral position. The fully opened position referred to here is the rotational position of the operating handle 7 when the end portion 13a of the elongated hole 13 contacts the rotational position regulating pin 14 in FIG. 3A, that is, FIG. It is a rotational position of the operation handle 7 when the operation handle 7 is rotated 180 ° from the state of FIG. 1.

FIGS. 4A and 4B are views showing the appearance of the circuit board 18 built in the casing 9 of the crescent body 2.

As shown in FIGS. 4 (a) and 4 (b), the circuit board 18 has a transmitter circuit 19 for transmitting radio waves and a button serving as a power source for driving the transmitter circuit 19. The open / close operation detection switch 21 for detecting the operation of the battery 20 and the operation handle 7 to activate the transmitting circuit 19, and detecting that the crescent body 2 is removed from the one window frame 4 to detect the transmitting circuit 19 And an illicit operation detection switch 22 for operating the.

The open / close operation detection switch 21 has a lead 21a.
It can be constituted by a normally open micro switch or the like which is turned on only when is pressed, and the tampering detection switch 22 includes the lead 22a.
It can be constituted by a normally-closed micro switch or the like which is turned on only when is released from the pressed state.

The terminal 25 fixed to the back side of the circuit board 18 is electrically connected to the signal output section of the transmission circuit 19 provided on the front side of the circuit board 18. The printed wiring pattern and the like on the circuit board 18 are not directly related to the gist of the present invention, and thus the description thereof is omitted.

FIG. 6 is a block diagram schematically showing the electrical connection relationship of the parts arranged on the circuit board 18.
Open / close operation detection switch 21 and unauthorized operation detection switch 22
As shown in FIG. 6, the button battery 20 serving as a power source
And the transmission circuit 19 are connected in parallel, and at least one of the switches is turned on, that is, the operation handle 7 is operated or the crescent body 2 is removed from the window frame 4. In this case, the transmission circuit 19 is automatically activated.

The configuration of the transmission circuit 19 is substantially the same as that of a transmitter used in a keyless entry system of an automobile or the like, and therefore its explanation is omitted here. In addition,
The keyless entry system referred to here is a system in which a door lock of an automobile is remotely operated from the outside to a locked / unlocked state by a transmitter mounted on a key of the automobile.

The state in which the circuit board 18 is mounted on the casing 9 of the crescent body 2 is shown in FIGS. 5 (a) and 5 (b). As shown in FIGS. 5 (a) and 5 (b),
The circuit board 18 is inserted from the back side of the casing 9 with the tampering detection switch 22 facing outward, and its four corners are fixed to the board receiving portion 23 of the casing 9 by screws. Opening 24 provided in the center of the circuit board 18
When assembling the circuit board 18, the circuit board 18
By accurately grasping the relative positional relationship between the lead 21a and the terminal 25 of the opening / closing operation detection switch 21 and the rotary cam 12 on the casing 9 side provided on the rear surface side of the casing, smooth assembly is possible while avoiding interference between the two. This is a viewing window for working.

Terminals 2 provided on the back side of the circuit board 18
As shown in FIG. 5A, the reference numeral 5 elastically slidably contacts the outer circumference of the rotary cam 12 to electrically connect the signal output portion of the transmission circuit 19 and the operation handle 7. Operation handle 7
Is formed of a conductive material such as an aluminum alloy as described above, and the operation handle 7 electrically connects to the transmission circuit 19 to function as an antenna (see FIG. 6). Actually, in addition to the operating handle 7, the human body operated by holding the operating handle 7 also functions as an antenna. Therefore, this point should be taken into consideration when designing the transmission circuit 19.

The outer peripheral portion of the rotary cam 12 is shown in FIG.
A protrusion 12a as shown in (a) is provided.
Then, when the projection 12a presses the lead 21a of the opening / closing operation detection switch 21 in accordance with the rotational movement of the rotary cam 12 caused by the opening / closing operation of the operation handle 7, the opening / closing operation detection switch 21 changes from the OFF state to the ON state. This state is maintained until the protrusion 12a changes and the protrusion 12a passes the tip of the lead 21a, and the oscillation circuit 19 operates.

The protrusion 12a presses the lead 21a of the opening / closing operation detection switch 21 because the operation handle 7 is moved from the completely closed position as shown in FIG. 5 (a) based on the directionality in FIG. 5 (a). Counterclockwise approximately 90 °, or as shown in FIG.
At the stage where the operation handle 7 is rotated clockwise by approximately 90 °, that is, the timing immediately before the engaging member 6 of the operation handle 7 is disengaged from the locking piece 3.

As shown in FIG. 1, since the engaging member 6 is formed by a tapered arc-shaped protrusion, the engaging member 6 is rotated when the operation handle 7 is rotated to a position of about 90 °. Bending part 3 of the taper surface 6a and the locking piece 3
A certain gap is generated between the inner side of a and the both sides to be insulated.

Therefore, the impedance of the locking piece 3 and the window frame 5 made of aluminum alloy is not added to the operation handle 7 which functions as an antenna when the transmission circuit 19 operates. Since the casing 9 of the crescent body 2 is completely insulated from the operation handle 7 by the stepped sleeve 11, the impedance of the aluminum alloy casing 9 and the window frame 4 causes the operation handle 7 as an antenna.
Will not be added to.

Therefore, the impedance of the operation handle 7 as an antenna is suppressed to a low value, radio waves can be output with a little power consumption, and the impedance is not changed, so that a stable transmission state is secured. be able to.

The fact that the window frames 4 and 5 can be opened by actually releasing the lock is that the operation handle 7 is rotated by 90 ° or more and the engagement between the engaging member 6 and the locking piece 3 is completely released. The operation timing of the opening / closing operation detection switch 21, that is, the operation timing of the transmission circuit 19 is
Slightly earlier than that. That is, the window frames 4 and 5 cannot be opened without operating the transmission circuit 19.

In this embodiment, since the locking piece 3 is formed of an aluminum alloy or the like equivalent to the operation handle 7 and the casing 9, the impedance of the locking piece 3 and the window frame 5 is applied to the operation handle 7 as an antenna. In order to prevent addition, it is necessary to strictly set the operation timing of the opening / closing operation detection switch 21 as described above.
When the insulating member is made of synthetic resin or the like, there is no problem of impedance increase due to the contact between the engaging member 6 and the locking piece 3, so the operation timing of the opening / closing operation detection switch 21 is set to the engaging member. It does not matter at any time as long as it is a stage before the fitting between 6 and the locking piece 3 is completely released.

In the crescent main body 2 thus constructed, the screws 27 are passed through the through holes 26 formed at the upper and lower ends of the crescent main body 2 from the front side, and as shown in FIG. It is fixed.

By fixing the crescent body 2 to the window frame 4, the lead 22a of the tampering detection switch 22 provided on the circuit board 18 is pressed by the abutment surface of the window frame 4 and the normally closed tampering operation is performed. Detection switch 2
2 is opened (OFF) in the state as shown in FIG. Therefore, as long as the crescent body 2 is normally fixed to the window frame 4, the tampering detection switch 22 does not operate and the transmitting circuit 19 does not react.

However, when an intruder from outside tries to unlock the window frames 4 and 5 by removing the crescent body 2 from the window frame 4, the crescent body 2 causes the window frame 4 to move.
When the operation handle 7 is opened / closed, since the pressing force acting on the lead 22a is lost by separating from the contact surface of the contact 22 and the tampering detection switch 22 automatically returns to the normally closed state (ON). The transmitting circuit 19 operates in the same manner as.

FIG. 7 shows an alarm device 2 which operates by receiving a radio wave from a transmitting circuit 19 incorporated in the crime prevention crescent 1.
8 is a perspective view showing the external appearance of FIG. 8, and FIG. 8 is a functional block diagram showing the internal structure of the alarm device 28 in a simplified manner. The crime prevention system according to the present embodiment is provided with the crime prevention crescent 1 and the alarm device. And 28.

As shown in FIGS. 7 and 8, the alarm device 28 includes a receiving circuit 29 for receiving the radio wave from the transmitting circuit 19 and a timer that operates for a set time by using the detection of the radio wave by the receiving circuit 29 as a stimulus. The circuit 30 and the volume 31 for adjusting the power supplied to the alarm speaker 32 are provided, and the user can freely operate the timer setting switch 33 and the volume setting switch 34 for setting the operating time of the timer circuit 30. Thus, the alarm device 28 is attached to the outside of the casing. Reference numeral 35 in FIG. 7 is a code for connecting the alarm device 28 to an indoor power source for home use, reference numeral 36 is an ON / OFF switch for setting activation / deactivation of the alarm device 28,
Further, reference numeral 37 is a pilot lamp.

Since the crime prevention crescent 1 of this embodiment is not provided with a special power switch for prohibiting the operation of the transmission circuit 19, it is necessary to open and close the window frames 4 and 5 in response to the request of the housekeeper. The open / close operation detection switch 21 reacts unconditionally even when the lock / unlock operation of the crime prevention crescent 1 is performed, and the transmission circuit 19 is activated each time.
The alarm device 2
Turn off the ON / OFF switch 36 on the 8 side, or
If the volume is set low, the alarm speaker 32
It is possible to prohibit the silent alarm output from. Of course,
Volume setting switch 34 and ON / OFF switch 3
A switch with a volume may be used instead of 6.

The volume of the alarm output itself can be freely adjusted by operating the volume setting switch 34, and the operating time of the alarm device 28, that is, the alarm speaker 3 can be adjusted.
The alarm output duration from 2 is set by the timer setting switch 3
It is possible to freely adjust by 3

If a plurality of crime-preventing crescents 1 having the same frequency of the transmitted radio waves are arranged in the window frame portions of the same house, only a single alarm device 28 is provided. It is possible to accurately detect that the crime prevention crescent 1 of the window frame has been opened / closed.

Further, a plurality of crime-prevention-type crescents 1 having different frequencies of radio waves to be transmitted are arranged in the window frame portions of the same house, and the alarm device 28 is provided with multiple channels, and the alarm device 28 is provided with an alarm corresponding to each frequency. If a lamp or the like is provided, it is possible to specify which window frame the crime prevention crescent 1 has been operated.

Further, by adopting the Crescent 1 with a crime prevention function, which emits radio waves of frequencies different from those used in adjacent houses, malfunction of the alarm device 28 due to duplication of radio waves between adjacent houses. It can be prevented.

As a means for identifying radio waves, known methods such as AM / FM modulation and PCM (pulse code modulation) can be used.

As described above, in the crime prevention crescent according to the embodiment of the present invention, all the components necessary for achieving the crime prevention function such as the transmission circuit, the power supply, and the open / close operation detection switch are provided inside the crescent body. Since it is arranged integrally, it is not necessary to arrange a wireless transmitter, a reed switch, etc. independent of the crescent body on the window frame, and the aesthetics of the window frame is improved. Moreover, it is practically impossible for an outside intruder to discover that Crescent Honmono has a crime prevention function, and the intruder avoids this and tries to invade from another window frame or door. Is also resolved. Further, since the number of independent elements constituting the crime prevention system is also reduced, the cost increase when installing the crime prevention system is suppressed.

Further, since the open / close operation detection switch is incorporated in the crescent body itself, unlike the case of the prior art in which a reed switch for detecting a steering wheel operation is provided on the window frame independently of the crescent body. Also, the troublesome work of positioning the reed switch for detecting the handle operation and the crescent body is not necessary, and the mounting work during construction becomes easy.

Further, the opening / closing operation detecting switch detects the rotational position of the operating handle immediately before the engaging member is disengaged from the locking piece and instantaneously activates the transmitting circuit. The operation consumes little power, and the power source such as the battery built into the crescent body can be used for a long period of time without replacement.

Further, since the operating handle made of a conductive material is also used as the antenna, the whole structure is simplified as compared with the case where an independent coil antenna or the like is built in the crescent body.

Also, unlike the configuration in which the coil antenna and the like are built in the crescent body, there is no concern that the antenna will be shielded by the casing of the crescent body, so that the casing of the crescent body can be made of a sturdy metal material. Is also advantageous in terms of mechanical strength.

Further, since the operation handle functioning as an antenna is attached to the crescent body in an electrically insulated state, it becomes an antenna even when the crescent body is fixed to the window frame with screws. The operation handle and the window frame such as the aluminum sash do not electrically connect to each other, and the impedance of the antenna is maintained at a low value, so that the transmitter circuit can be operated appropriately with a small amount of power consumption, and The output state is also stable.

Since the alarm device forming a part of the crime prevention system is configured as a unit different from the crime prevention crescent, the alarm device can be placed at any position inside and outside the house as long as the radio wave from the transmitting circuit can be reached. It can be installed freely.

The operation handle 7 made of a conductive material
The engaging member 6 is formed integrally with the operation handle 7 by the tapered arc-shaped ridge projecting on the ridge, and is rotatably attached to the crescent body 2 while being electrically insulated from the crescent body 2. The operation handle 7 may be attached, and the operation handle 7 may be connected to the transmission circuit 19 to be used as an antenna.

According to this structure, the operating handle 7
Since it is also used as an antenna, the entire structure is simplified as compared with the case where an independent coil antenna or the like is built in the crescent body.

In the locked state, the operating handle made of a conductive material is electrically connected to the aluminum sash or the like constituting the other window frame through the above-mentioned engaging member and locking piece. However, the opening / closing operation detection switch has a rotational position of the operation handle immediately before the engaging member is disengaged from the locking piece, that is,
Since the tapered arc-shaped ridge of the operation handle is momentarily activated when it is out of contact with the locking piece, the other window frame acts as the impedance of the operation handle when the transmission circuit is operating. There is nothing to do.

It is also possible to combine the operation handle 7 and the casing 9 without insulating the operation handle 7 and the casing 9 and use them as an antenna for transmission. In this case, the casing 9 and one of the window frames 4 are insulated with a rubber sheet or the like, and an insulating sleeve made of synthetic resin or the like is interposed between the casing 9 and the screw 27 to provide the oscillator circuit 19
Is designed according to the combined impedance of the operating handle 7 and the casing 9.

As the opening / closing operation detection switch 21 and the illicit operation detection switch 22, well-known detection means such as a photo sensor or a proximity switch can be used in addition to the micro switch. Therefore, it is desirable to use mechanically actuated contacts such as microswitches. In the above-described embodiment, the operation of the operation handle 7 is prohibited from stopping at the neutral position by the action of the coil spring 17 that functions as a fulcrum crossing spring, so that the operation time of the opening / closing operation detection switch 21 is suppressed to an extremely short time. It is possible and very convenient in terms of power saving.

[0069]

As described above, according to the present invention, when at least one of the open / close operation detection switch and the unauthorized operation detection switch is turned on, that is, whether the operation handle is operated, When the Crescent main unit is removed from the window frame, the transmission circuit automatically operates, so as long as the Crescent main unit is properly fixed to the window frame, the tampering detection switch operates to make a call. The circuit does not react and it is virtually impossible for an outside intruder to discover that the Crescent body has a crime prevention function, and the intruder can avoid this and enter through another window frame or door. The problem of trying to be solved is also solved.

Further, since the operating handle is attached to the crescent body in an electrically insulated manner, and the operating handle is connected to the transmitting circuit as an antenna, it functions as an antenna when the transmitting circuit operates. The impedance of the locking piece and the window frame is not added to the operation handle, the impedance of the operation handle as an antenna is suppressed to a low value, and it becomes possible to output radio waves with a small amount of power consumption. Since there is no change in impedance, a stable transmission state can be secured.

The opening / closing operation detection switch detects the rotational position of the operation handle immediately before the engaging member is disengaged from the locking piece, and activates the transmission circuit only at the moment when this detection is performed. Power consumption due to the operation of the circuit can be small.

In the crime prevention system according to the present invention, the alarm device is configured as a unit different from the crime prevention crescent, so that if the radio wave from the transmission circuit reaches,
It can be installed anywhere inside and outside the house.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of a crime prevention crescent to which the present invention is applied.

FIG. 2 (a) is a side view showing the internal structure of a crime prevention crescent casing, and FIG. 2 (b) is a sectional view thereof.

FIG. 3 (a) is a side view showing an internal structure in a state where mechanical components are attached to a crime prevention crescent casing, and FIG. 3 (b) is a sectional view thereof.

4 (a) is a plan view showing an outline of a circuit board mounted in a crime prevention crescent casing, FIG.
(B) is the side view.

5 (a) is a side view showing an internal structure in a state where mechanical components and a circuit board are attached to a crime prevention crescent casing, and FIG. 5 (b) is a sectional view thereof.

FIG. 6 is a block diagram schematically showing an electrical connection relationship of parts on a circuit board.

FIG. 7 is a perspective view showing an external appearance of an alarm device used with the crime prevention crescent.

FIG. 8 is a functional block diagram schematically showing the internal structure of the alarm device.

[Explanation of symbols]

1 Crescent with crime prevention function 2 Crescent body 3 locking pieces 4 window frames 5 window frames 6 Engagement member 7 Operation handle 12 rotating cams 12a protrusion 17 coil spring 19 Transmitter circuit 21 Open / close operation detection switch 21a lead 22 Unauthorized operation detection switch 28 Alarm device

Claims (4)

[Claims] 1. A locking piece provided on one window frame and an engaging member of a crescent body provided on the other window frame are disengaged by switching the operation handle between an open position and a closed position. In the crescent for locking / unlocking the window frame, an opening / closing operation detection switch, which is provided in the crescent body and detects switching of the operation handle from the closed position to the open position, and the window frame A tampering detection switch for detecting removal of the crescent body, and a crescent body provided, which operates based on a signal from at least one of the opening / closing manipulation detection switch and the tampering detection switch to emit a radio wave. A transmission circuit, the operation handle is electrically insulated from the crescent body, and the operation handle is an antenna. Crescent with security features, characterized in that it is connected to the transmission circuit by. 2. The opening / closing operation detection switch includes a protrusion provided on a rotating cam that rotates in accordance with the rotation operation of the operation handle, and a lead pressed by the protrusion, and the engagement member of the operation handle. The crescent with a crime prevention function according to claim 1, wherein the lead is pressed by the protrusion to detect the switching of the operation handle at the timing when the lead is released from the locking piece. 3. The crime prevention crescent according to claim 1, wherein the opening / closing operation detection switch is biased from a neutral position to the open position or the closed position by a coil spring. 4. A crime prevention system, comprising: the crescent with a crime prevention function according to claim 1; and an alarm device that operates by receiving a radio wave from the transmission circuit. .