JP3429152B2 - Anti-theft device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a housing and a fixture having a rod-shaped portion inserted and connected to the housing.
The rod-shaped portion is configured to be movable in a direction intersecting the insertion / removal direction of the rod-shaped portion and to be biased to return to a side protruding into the insertion / removal path of the rod-shaped portion. Detects whether or not the retaining member that engages with the engaging recess formed on the surface to prevent the attachment from coming off and the rod-shaped portion that is inserted and connected to the housing have been removed. The present invention relates to an anti-theft device including rod-shaped portion detecting means and alarm output means for outputting an alarm based on a detection signal from the rod-shaped portion detecting means.

[0002]

2. Description of the Related Art Such an anti-theft device is used by being attached to an anti-theft object, and when the anti-theft device is illegally removed from the anti-theft object, an alarm is output and the anti-theft object is illegally handled. It is to inform that it is being done. To attach this anti-theft device to an anti-theft object, for example, when the anti-theft object is clothes, the rod portion of the fixture is inserted into the case of the anti-theft device while penetrating the clothes. Install by that. In order to maintain the state in which the housing of the anti-theft device is attached to the anti-theft object in this manner, the rod-shaped portion of the fixture is provided with an engaging recess on the peripheral surface, and the rod-shaped portion is inserted into the housing. Then, the retaining member urged to return to the side projecting into the insertion / removal path of the rod-shaped portion engages with the engaging concave portion to prevent the attachment tool from coming off. Conventionally, for example, as disclosed in Japanese Patent Laid-Open No. 7-65257, the retaining state of the retaining member engaged with the engaging recess is maintained only by the restoring biasing force.

[0003]

However, in the above-mentioned conventional structure, when a force is applied to the fitting in the pulling-out direction, the retaining member moves to the engagement releasing side so that the fitting is the anti-theft device. In some cases, it was separated from the housing. If the action of force on this fixture is based on cheating, an alarm will be output when the fixture is removed,
Although it achieves the original purpose of the device, if the anti-theft device is impacted in any way, or if someone who is interested in the anti-theft device itself pulls out the mounting tool lightly without any intention of fraud. Even in such a case, if the mounting tool is detached and the alarm is activated, the purpose of the apparatus for accurately detecting the illegal activity cannot be achieved sufficiently. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a theft prevention device capable of accurately notifying a fraudulent act by further securing the attachment tool from coming off.

[0004]

According to the present invention, the rod-shaped portion of the fitting is inserted into the anti-theft object and the anti-theft device is attached to the anti-theft object. The engaging recess of the portion engages with the retaining member to prevent the attachment from coming off, and the receiving member receives the retaining member engaged with the engaging recess to move to the disengagement side. Suppress. Therefore, even if a force is applied to the attachment in the pull-out direction, not only the engagement between the engagement concave portion of the rod-shaped portion and the retaining member but also the retaining member moves to the engagement releasing side by the receiver. Suppress the. As a result, it is possible to provide a theft prevention device capable of accurately notifying a fraudulent act by further assuring that the attachment tool is prevented from coming off. When the rod-shaped portion is inserted into the housing, it is necessary to temporarily move the retaining member on the disengagement side in order to engage the engagement recess of the rod-shaped portion with the retaining member. The tool allows the stopper member to move to the engagement release side when the rod-shaped portion is inserted, and the rod-shaped portion can be inserted and operated.

Further, by providing the structure according to the above-mentioned claim 2, the retaining member which engages with the engaging recess of the rod-like portion to prevent the attachment tool from coming off is movable in the inserting / removing direction of the rod-like portion. In addition, the receiving member that suppresses the movement of the retaining member to the disengagement side receives the retaining member in the set range in the insertion / removal direction. Therefore, by moving the retaining member out of the set range, the retaining member is allowed to move to the disengagement side, and the rod-shaped portion is inserted into the housing and the attachment is detached by the regular removal operation. Can be operated accurately. Moreover, since the retaining member is urged to return to the side of the rod-shaped portion projecting into the insertion / removal path, the rod-shaped portion and the retaining member come into contact with each other when the rod-shaped portion is inserted, and the retaining member is attached to the retaining member. The force also acts in the direction of moving in the insertion / removal direction. That is, the operating force for inserting the rod-shaped portion into the housing can contribute to the movement of the retaining member outside the set range. Therefore, it is possible to easily and accurately attach / detach the fixture to / from the housing.

According to the third aspect of the invention, when the rod-shaped portion of the fixture is inserted into the housing, the conical tapered portion at the tip of the rod-shaped portion is first formed into the arc-shaped cut-out member. Hold the notch. The diameter of the arcuate cutout is smaller than the maximum diameter of the conical taper, so it contacts the midpoint of the conical taper and prevents the rod from coming off as the rod is inserted. The member is swung to the disengagement side. As a result, the conical taper portion shifts from the state of contacting the arcuate notch portion to the state of being located in the wide portion having a diameter larger than the maximum diameter of the conical taper portion, and passes through the retaining member. When the retaining member is swung at this time, it is also swung in the insertion direction of the rod-shaped portion by being pushed by the cone-shaped tapered portion, and the tip of the rod-shaped portion is formed as a conical tapered portion. Correspondingly, since the retaining member is formed with the arcuate notch, the swinging of the rod in the insertion direction becomes large. Therefore, the retainer can be swung properly beyond the setting range where the retainer receives the retainer member, and the retainer member can be engaged with the retainer member when the rod-shaped portion is inserted after ensuring the above-mentioned set range. Swing to the release side can be allowed. Furthermore, when the engaging recessed portion of the rod-shaped portion is inserted to a position facing the retaining member, the retaining member swings back by the restoring biasing force to engage with the engaging recessed portion. Since the tip of the rod-shaped part is formed as a conical taper part and the arc-shaped notch part is formed correspondingly to the retaining member, it prevents retaining when the pull-out operation force acts on the fixture. The member accurately holds the engaging recess of the rod-shaped portion, which can effectively contribute to preventing the attachment tool from coming off.

Further, by providing the structure according to claim 4, as described above, when the rod-shaped portion is inserted into the housing, the retaining member exceeds the setting range in which the receiver receives the retaining member. Although the rod also swings in the insertion direction of the rod, the surface of the receiving member facing the retaining member is formed in a shape along the movement trajectory of the retaining member, so that the retaining member engages with the retaining member. It is possible to avoid excessive restraint of the movement toward the release side, make it easy for the retaining member to swing beyond the set range, and be advantageous in terms of actual manufacturing.

Further, by providing the structure according to the fifth aspect, when the mounting tool is removed from the state where the mounting tool is inserted in the housing, the disengagement operation tool is operated,
The disengagement moving member is moved and removed. When the disengagement moving member is operated to move, the contact operation section provided on the disengagement moving member contacts the retaining member, and the retaining member avoids contact with the receiving member. Swing operation with operating force applied to. Therefore, the fitting can be removed by a simple operation of moving the disengagement moving member by the operation of the disengagement operation tool. It is possible to accurately release the engagement by swinging the retaining member that acts to prevent the attachment tool from coming off, while making it not removable.

Further, by providing the structure according to claim 6, the retaining member that engages with the engaging recess of the rod-shaped portion and the spring that biases the attachment toward the disengagement side are integrally housed in the attachment unit. A rod-shaped insertion / removal path is formed in the attachment unit. That is, the anti-theft device can be easily assembled by integrally forming the members relating to the attachment and detachment of the fixture. Moreover, by utilizing the fact that the retaining member is housed in the attachment unit as described above, the receiver for receiving the retaining member is formed on the outer wall of the attachment unit, thereby simplifying the configuration. Can be planned.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an anti-theft device of the present invention will be described below with reference to the drawings. As shown in the plan view of FIG. 1 (a) and the side view of FIG. 1 (b), the antitheft device 1 includes a substantially rectangular parallelepiped casing 2, and a product whose the casing 2 is an antitheft object. And a mounting pin 3 as a mounting tool for mounting on the. As shown in FIG. 3B and the like, the mounting pin 3 includes a metal rod-shaped portion 3A and a resin head 3B that holds one end of the rod-shaped portion 3A. An engaging concave portion 3a for engaging with and a tapered conical taper portion 3b are formed.
When attaching the housing 2 to a product such as clothing, for example, as shown in FIG.
As shown in (b), the rod-shaped portion 3A of the mounting pin 3 is garment F
It is attached by being connected to the housing 2 through the button holes of the

The structure for mounting the mounting pin 3 on the housing 2 will be described below. The mounting pin 3 is, as shown in FIGS.
It is attached to the housing 2 while being inserted into the pin insertion hole 40 of the attachment unit 4 provided in contact with the inner wall of the housing 2. As shown in FIGS. 3 to 5, the attachment unit 4 is provided with a hook-shaped lock spring 41 that engages with the attachment pin 3 inserted into the pin insertion hole 40 to prevent the attachment pin 3 from coming off.
At the rear side of the lock spring 41 in the insertion direction of the mounting pin 3,
A detection switch S that functions as a rod-shaped body detecting unit that detects whether or not the rod-shaped portion 3A inserted into the housing 2 has been removed is provided.

The lock spring 41 is locked at its bent portion 41c to the spring locking projection 49 projecting from the main body of the fixture unit 4, and the end portion 41a of the lock spring 41 is locked.
Is fixed to the main body of the attachment unit 4. The material of the lock spring 41 is metal and has elasticity, and the end portion 41 on the free end side is
As b is rocked from the neutral point, a return biasing force to the neutral point acts in the vertical and horizontal directions. An engaging hole 42 that engages with the engaging recess 3a of the mounting pin 3 is provided in an intermediate portion between the end portion 41b of the lock spring 41 and the bent portion 41c, as described later. The engagement hole 42 is formed such that the large-diameter wide portion 42a and the small-diameter arc-shaped hole portion 42b are integrally connected, and when the lock spring 41 is at the neutral point, when viewed in the depth direction of the pin insertion hole 40, Arc-shaped hole 42
It is arranged so that the center position of b is substantially the center of the pin insertion hole 40. That is, the lock spring 41 has the rod-shaped portion 3A.
The rod-shaped part 3A is movable in the direction intersecting the insertion / removal direction of
Of the engaging recess 3a formed on the peripheral surface of the rod-shaped portion 3A so as to be biased to return to the side projecting into the insertion / removal path.
Retaining member O that engages with and prevents the mounting pin 3 from coming off.
Functions as S.

The free end 41b of the lock spring 41 is
From the opening 43 formed on the side surface of the fixture unit 4,
It projects to the outside of the fixture unit 4. The opening 43 from which the lock spring 41 projects is formed in a substantially L-shape with a tapered portion 43a as shown in FIG. 6 showing the shape of the opening 43 when viewed in the depth direction (direction of arrow A in FIG. 3).
The position indicated by the solid line is the position near the neutral point of the lock spring 41. Therefore, when the lock spring 41 is in a posture near the neutral point, the presence of the taper portion 43a suppresses the free end side end portion 41b of the lock spring 41 from swinging toward the base end side end portion 41a. It will be done. The lock spring 41 has a rod-shaped portion 3A formed by the tapered portion 43a.
Although the movement toward the disengagement side is suppressed in the setting range in the insertion / removal direction, the setting range is determined by the depth of the engagement recess 3a and the like.

The detection switch S, as shown in FIG.
A receiving disc 30 that receives the conical tapered portion 3b of the mounting pin 3, a conductive coil spring 31 that is a spring that urges the mounting pin 3 to return, and a coil at the bottom of the mounting unit 4. It is configured to include a conductive electrode member 32 that is in contact with one end side of the spring 31 and partially extends to the lower surface of the fixture unit 4. The receiving disc 30 is supported by the upper end portion of the coil spring 31, and as shown in FIG. 7, the upper end side of the coil spring 31 extends laterally and has a loop extending downward. The formed electrode piece 31a is provided. A printed circuit board 6 is provided on the lower surface side of the fixture unit 4, and the detection switch S is provided on the printed circuit board 6.
6b, which is in constant contact with the electrode member 32 of FIG.
And an electrode 6a that comes into contact with the electrode piece 31a when is inserted into the housing 2. Therefore, the printed circuit board 6
The electrode 6a is also a constituent element of the detection switch S.

When the mounting pin 3 is inserted into the pin insertion hole 40, the diameter of the arcuate hole portion 42b is formed to be smaller than the maximum diameter of the tapered tip portion of the mounting pin 3, so that the tapered portion is formed. When the tip end of the shape is engaged with the arcuate hole portion 42b of the engaging hole 42 and the mounting pin 3 is further inserted, the direction in which the free end side end portion 41b approaches the base end side end portion 41a, and the lock spring 41. A force acts in the direction to push down the lock spring 41, and the lock spring 41 swings along the tapered portion 43a shown in FIG. In other words, the formation surface of the taper portion 43 a facing the lock spring 41 is also formed in a shape along the movement trajectory of the lock spring 41. Therefore, the tapered portion 4
3a functions as a receiving member RE that receives the lock spring 41 to suppress the movement toward the engagement release side and allows the movement toward the engagement release side when the rod-shaped portion 3A is inserted.

Then, when the mounting pin 3 is inserted until the engaging recess 3a of the mounting pin 3 reaches the position where the lock spring 41 exists, the lock spring 41 engages with the engaging recess 3a and the position shown by the solid line in FIG. Then, the mounting pin 3 is locked. In this locked state, the coil spring 31 exerts a biasing force on the mounting pin 3 toward the disengagement side, and this biasing force causes the free end side end portion 41b of the lock spring 41 to approach the base end side end portion 41a. , But due to the presence of the tapered portion 43a of the opening 43,
The approach movement is blocked.

When the mounting pin 3 is thus inserted and locked, as shown in FIG.
The coil spring 31 is pushed in the compression direction by the conical taper portion 3b. Accordingly, the electrode piece 31a
Moves in the insertion direction of the mounting pin 3, passes through the opening 44 formed in the lower surface of the mounting tool unit 4, and contacts the electrode 6a of the printed circuit board 6. Since the electrode piece 31a is elastically supported by the portion extending from the upper end side of the coil spring 31, the electrode piece 31a is surely brought into contact with the electrode 6a.

Next, a structure for releasing the locked state of the mounting pin 3 will be described. The lock with respect to the attachment pin 3 is released by swinging the free end side portion 41b of the lock spring 41 by the slide member 5 functioning as the engagement releasing moving member shown in FIGS. 2 to 4 and 8. The slide member 5 is the housing 2
2, a base 5b of which is cut away, as shown in FIG.
Is slidably engaged with a guide portion 2a provided on the inner wall of the housing 2, and moves in a direction indicated by an arrow P in FIGS. In order to slide the slide member 5, a key insertion hole 45 for inserting an engagement release key K, which is an engagement release operation tool shown in FIG. 12, is formed in the attachment unit 4, and further, a key insertion hole 45 is formed. A pinion gear 46 rotatably supported in a state of penetrating a wall portion of the fixture unit 4 at a location on the inner side of the key insertion hole 45 and exposed to both sides of the key insertion hole 45 and the fixture unit 4 outside. Is provided.

When the disengagement key K is inserted into the key insertion hole 45, as shown in FIG. 10, the disengagement key K is released.
Rack portion K1 formed at the end of the and attachment unit 4
Of the pinion gear 46 meshes with each other, and the pinion gear 46 also meshes with the rack portion 5 a formed on the slide member 5. Therefore, the disengagement key K is inserted into the key insertion hole 4
As it is inserted in 5, the slide member 5 slides in the direction opposite to the insertion direction of the engagement releasing key K. As shown in FIG. 9, the contact operation portion 5d, which is the contact portion of the slide member 5 with the lock spring 41, has an inclined guide surface 5e for swinging the end 41b of the lock spring 41 in the insertion direction of the mounting pin 3. , An inclined guide surface 5f for swinging the end portion 41b in a direction orthogonal to the insertion direction of the mounting pin 3 is formed, and as the slide member 5 slides, the two inclined guide surfaces 5e, 5f cooperate with each other. , The lock spring 41 is swung from the position shown by the solid line in FIG. 6 to the position shown by the phantom line. As a result, the engaging action of the lock spring 41 with respect to the mounting pin 3 is released, the mounting pin 3 is pushed out by the urging force of the coil spring 31, and the electrode piece 31 a of the coil spring 31 is separated from the electrode 6 of the printed circuit board 6.
Separated from a.

When the disengagement key K is pulled out from the key insertion hole 45, the slide member 5 is driven by the pinion gear 46, and at the same time, the elastic member 5c provided on the slide member 5 is returned by elastic deformation. It returns to its original position due to power.

Next, the electric circuit portion of the anti-theft device 1 will be described. In the electric circuit portion of the anti-theft device 1, based on the detection signal of the detection switch S, that is, as the electrode piece 31a forming the detection switch S and the electrode 6a switch from the contact state to the separated state. An alarm output means AO for outputting an alarm is provided. The alarm output means AO is mainly provided on the printed circuit board 6, and specifically, is composed of a circuit conceptually shown in a block diagram in FIG. The circuit shown in FIG. 8 schematically includes the detection switch S, the LED lamp 20a, and the piezoelectric buzzer 2 described above.
A sounding circuit 20 having 0b, an antenna 21 composed of a coil and a capacitor as a resonance antenna,
An antenna input circuit 22 that outputs a reception signal when the antenna 21 is in a receiving state, a switch input circuit 23 that outputs a removal detection signal when the detection switch S is in a cut state due to the removal operation of the mounting pin 3, and the LED lamp 20a.
And a drive circuit 24 for controlling whether or not the piezoelectric buzzer 20b is energized, a signal processing circuit 25 for controlling the drive circuit 24 in response to signals from the antenna input circuit 22 and the switch input circuit 23, and various oscillation circuits for timekeeping. Two
6, a counter 27, a battery 28, a semiconductor switch 29a including a transistor or an FET,
29b, 29c, 29d, 29e, and a reset switch R. The radio wave received by the antenna 22 is transmitted from the transmitter O formed as shown in FIG. The transmitter O is installed, for example, at a doorway of a store or the like with a passage in between.

The operation of the circuit after the rod-shaped portion 3A of the mounting pin 3 is inserted into the pin insertion hole 40 and the antitheft device 1 is attached to the antitheft object will be briefly described below. The semiconductor switches 29a, 29c, 29d are the signal processing circuit 2
In the initial state in which the on / off switching is controlled by 5, and the signal processing circuit is not energized, “off”, “on”, and
It is "cut". Also, the semiconductor switch 29b is
When the detection switch S or the semiconductor switch 29a is "on", the semiconductor switch 29 becomes "on".
e is “off” only while the reset switch R is “on”. Therefore, the mounting pin 3 is inserted,
When the detection switch S is turned “on” by the electrode piece 31a coming into contact with the electrode 6a on the printed circuit board 6, the semiconductor switch 29b is turned “on”, and the power of the battery 28 is supplied to the oscillation circuit 26 and the counter 27. Then, the counter 27 starts counting.

When the counter 27 completes counting the set count value corresponding to about ten and several seconds, the semiconductor switch 2
9d is set to "ON", and energization of the signal processing circuit 25 and the like is started. If the detection switch 5 is turned “on” by removing the antitheft device 1 from the antitheft object before the completion of the counting of the set count value, the oscillation circuit 26 and the counter 27 are deenergized and reset. To be done.
That is, if the detection switch 5 is not turned off during the time corresponding to the set count value, the power supply to the signal processing circuit 25 and the like is not started. When the power supply to the signal processing circuit 25 is started, the signal processing circuit 25 holds the semiconductor switch 29d in the “on” state, and supplies power to the signal processing circuit 25 and the like regardless of whether the detection switch 5 is turned on or off thereafter. While maintaining the state, the semiconductor switch 29c is turned off to stop the oscillation circuit 26 and the counter 27, and the antitheft device 1 is activated.

After the anti-theft device 1 is activated, when the mounting pin 3 is forcibly pulled out with a strong force without performing the regular releasing operation, the detection switch S is in the "OFF" state. As a result, the switch input circuit 23 outputs a removal detection signal to the signal processing circuit 25. When the removal detection signal is input, the signal processing circuit 25 receives the semiconductor switch 29a.
Is turned on and the semiconductor switch 29c is turned on. As a result, the oscillation circuit 26 and the counter 27 start operating, and the counter outputs a pulse signal of a set repetition period to the signal processing circuit 25. The signal processing circuit 25 causes the LED lamp 20a to blink by the pulse signal via the drive circuit 24, and also causes the piezoelectric buzzer 20b to ring and output an alarm.

When the anti-theft device 1 is properly removed from the anti-theft object, the above-mentioned disengagement key K is inserted into the key insertion hole 45. By inserting the disengagement key K,
As described above, the mounting pin 3 is disengaged, the reset switch R provided in the key insertion hole 45 is turned on, and the semiconductor switch 29e is turned off. As a result, the supply of electric power from the battery 28 is stopped, and the initial state is restored. The above has described the case where the sensor tag 1 is illegally removed from the antitheft object. However, in an attempt to illegally take out the antitheft object with the sensor tag 1 attached,
Even when the antenna 22 passes near the transmitter O, the antenna 22 receives the radio wave from the transmitter O, and the sounding circuit 20 is emitted in the same manner as above.
Operate.

[Other Embodiments] Other embodiments will be listed below. In the above-described embodiment, the receiver RE is fixedly formed by using the outer wall portion of the fixture unit 4, but a dedicated key is used to hold the receiver RE to receive the retaining member OS. It may be configured so that the operation can be switched to a posture that allows the movement to the disengagement side. Also, the rod-shaped part 3
The detection piece that is provided in the insertion / removal path of A and the receiving member RE are interlockingly linked, and the detection piece is retreated by abutting between the detection piece and the rod-shaped portion 3A, and the retaining member is retained. OS
It may be configured to switch from the posture for receiving the engagement to the posture for permitting the movement to the disengagement side. In this case,
When the retaining member and the engaging recess 3a are engaged, the locking piece also needs to be placed in a positional relationship that engages with the engaging recess 3a.

In the above embodiment, the retaining member O
S is composed of a lock spring 41, and the retaining member OS itself is provided with a return urging force.
The insertion / removal path may be provided with a thin plate-like member that can be moved back and forth by sliding movement, and the thin plate-like member may be configured to be biased to return to the side projecting into the insertion / removal path. In the above-described embodiment, the tapered portion 43a forming the receiving member RE is formed along the movement locus of the retaining member OS when the rod-shaped body 3A is inserted. The specific shape can be changed in various ways, such as by forming it on a plane parallel to.

The specific configuration of the attachment 3 can be variously changed according to the attachment target.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an external view of a theft prevention device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement configuration inside a housing according to an embodiment of the present invention.

FIG. 3 is a sectional view of an essential part according to the embodiment of the present invention.

FIG. 4 is a sectional view of an essential part according to the embodiment of the present invention.

FIG. 5 is a sectional view of an essential part according to the embodiment of the present invention.

FIG. 6 is an enlarged view of a main part according to the embodiment of the present invention.

FIG. 7 is a perspective view of a main part according to the embodiment of the present invention.

FIG. 8 is a block configuration diagram according to an embodiment of the present invention.

FIG. 9 is an external perspective view of a slide member according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view of essential parts according to the embodiment of the present invention.

FIG. 11 is an external perspective view of a transmitter according to an embodiment of the present invention.

FIG. 12 is a view showing an engagement releasing key according to an embodiment of the present invention.

[Explanation of symbols]

2 housing 3 Mounting part 3A bar 3a Engagement recess 4 Mounting unit 5 Disengagement moving member 5d Contact operation section 31 spring AO alarm output means K disengagement operation tool OS retaining member RE receiver

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-65257 (JP, A) JP-A-8-50682 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08B 13/22-13/26

Claims (6)

(57) [Claims] 1. A housing (2) and a fixture (3) provided with a rod-shaped portion (3A) inserted and connected to the housing (2) are provided, and the rod-shaped portion (3A) is provided in the housing (2). Of the rod-shaped portion (3A) is configured to be movable in a direction intersecting the insertion-removal direction of the rod-shaped portion (3A) and to be urged to return to the side of the rod-shaped portion (3A) projecting into the insertion-removal path.
A retaining member (OS) that engages with an engaging recess (3a) formed on the peripheral surface of A) to prevent the attachment tool (3) from coming off, and is inserted and connected to the housing (2). The rod-shaped portion (3A) that is being operated is a rod-shaped portion detecting means (S) for detecting whether or not the rod-shaped portion (3A) is operated, and an alarm output means for outputting an alarm based on the detection signal of the rod-shaped portion detecting means (S). (AO), the anti-theft device including: (AO), wherein the housing (2) receives the disengagement prevention member (OS) engaged with the engagement recess (3a) and releases the engagement. (R) which restrains the movement to the side and allows the movement to the disengagement side when the rod portion (3A) is inserted.
Anti-theft device equipped with E). 2. The retaining member (OS) is movably supported in the insertion / removal direction of the rod-shaped portion (3A) and is biased to return to the side that engages with the engagement recess (3a). The anti-theft device according to claim 1, wherein the receiving member (RE) is configured to receive the retaining member (OS) in a setting range in the insertion / removal direction of the rod-shaped portion (3A). 3. The attachment (3) includes the rod-shaped portion (3).
The tapered conical taper portion (3b) is provided at the tip of (A), the engagement recess (3a) is formed near the conical taper portion (3b), and the rod shape of the retaining member (OS) is formed. Department (3A)
A state in which an arcuate cutout portion (42b) having a diameter smaller than the maximum diameter of the conical taper portion (3b) is formed at an expected passage position of the conical taper portion (3b), and the arcuate cutout portion (42b) is provided continuously. A wide portion (42a) having a diameter larger than the maximum diameter of the conical taper portion (3b) is formed, and the conical shape is formed as the rod-shaped portion (3A) is inserted into the housing (2). From the state where the tapered portion (3b) abuts the arcuate notch portion (42b), the wide portion (42
a), the state of contact with the retaining member (O
The antitheft device according to claim 2, wherein S) is configured to swing in a direction intersecting the insertion / removal direction beyond the set range. 4. A surface of the receiving member (RE) facing the retaining member (OS) is the retaining member (OS) when the rod-shaped portion (3A) is inserted into the housing (2). 4. The antitheft device according to claim 3, wherein the antitheft device is formed in a shape along a movement locus of). 5. A disengagement moving member (5) that is moved in the housing (2) by operating a disengagement operation tool (K), and the disengagement movement is performed. The retaining member (OS) is moved to the member (5) by moving the engagement releasing operation tool (K).
And a contact operation section (5d) for rocking the retaining member (OS) in a state where an operation force is applied to the contact avoiding side of the retainer (RE). The antitheft device according to any one of claims 2 to 4. 6. The rod-shaped portion (3) in the housing (2).
A fixture unit (4) that has the insertion / removal path of A) and that houses the spring (31) for urging the fixture (3) to the detachment side and the retaining member (OS) is integrated. The receiver (RE) is formed in a portion of the outer wall portion of the attachment unit (4) where a part of the retaining member (OS) projects. Anti-theft device described in paragraph.