JP7122780B2 - Alarm device for safety belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a safety belt worn by a worker working at height, and to an alarm device for alarming the state of use of the safety belt.

Workers are obliged to wear safety belts to prevent falls when working at high places such as construction sites. The safety belt includes a human body belt worn on the body of a worker, a rope having one end connected to the human body belt, and a hook provided at the other end of the rope. Human body belts are broadly classified into a full-harness type, which is structured to support a plurality of positions such as the shoulders, waist, and thighs of an operator, and a belt-shaped body belt type, which is worn around the waist of an operator. Also known are those equipped with a shock absorber that absorbs the impact during fall arrest, or a rope winder with a locking mechanism, at the connecting portion between the body belt and the rope. Prior to working at heights, workers hook hooks on installation equipment such as master ropes, handrails of scaffolds, and buildings, and then work at heights. A safety harness is also called a fall arrest device.

In order to prevent fall accidents, it is essential that workers use safety belts correctly and reliably. In view of this, a system has been proposed that encourages workers to wear safety belts and manages the usage status (see Patent Document 1). In Patent Document 1, sensors such as a pressure sensor and an open/close sensor and a transmission circuit for wirelessly transmitting sensor signals are provided on the hook, and a control box is provided on the human body belt. The control box includes a sensor signal receiver, a speaker, an LED, and a controller. Based on the sensor signal received from the hook, the control device of the control box performs various notification controls using a speaker and LED, and transmits the usage status of the safety belt to the personal computer by wireless communication. The personal computer manages the usage status received from the safety belt, and performs notification control as necessary.

Japanese Patent No. 5116815

However, the safety belt described in Patent Literature 1 uses a dedicated hook to which sensors are attached. In other words, existing safety belts cannot be used, resulting in a problem of high cost. Moreover, the safety belt described in Patent Document 1 requires batteries for both the hook and the control box, so there is a problem that complicated battery management and replacement work are required. Moreover, since it is necessary to turn on the power with both the hook and the control box during use, there is a problem of lack of convenience. Furthermore, since sensor signals are transmitted from the hook to the control box via wireless communication, there is a risk that proper operation will be hindered due to communication failures depending on the work environment, and power consumption and costs will increase. be.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inexpensive notification device capable of reporting the state of use of an existing safety belt without modifying it. is to provide

In order to achieve the above objects, the present invention provides a safety belt triggering device for use attached to a safety belt including a hook having a hook-shaped member, wherein a portion of the hook-shaped member is attached to an inner edge thereof. A detachable case formed so as to cover the outer edge portion in an exposed state, a detection means provided in the case for detecting that the hook is hung on the first hooked object, and announcing a notification means for performing an operation; and a notification control means for controlling the notification means to notify that the first suspended object has been hung on the basis of a detection signal from the detection means, wherein the detection means It is characterized by comprising a lever that rotates in contact with the first object to be suspended when the hook is hung on the first object to be suspended, and a sensor that detects the rotation of the lever.

According to the present invention, the case of the safety belt alarm device is formed so as to cover a part of the hook-shaped member of the hook of the safety belt from the outer edge while the inner surface thereof is exposed. It can be used by simply attaching it to an existing hook without preparing a hook. In addition, since the detection means, the notification means, and the notification control means are provided in one case, the structure is simple and does not require other devices. becomes expensive.

Front view of alarm device for safety belt Top view of alarm device for safety belt Left side view of alarm device for safety belt Front view showing how the alarm device for safety belt is attached to the hook Cross-sectional view cut at the position of line A in FIG. 2 with the alarm device for safety belt attached to the hook Cross-sectional view cut along line B in FIG. Front view of the hook to which the safety belt alarm device is attached Safety belt alarm device circuit diagram

A safety belt alarm device according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view of the safety belt alarm device, Fig. 2 is a top view of the safety belt alarm device, Fig. 3 is a left side view of the safety belt alarm device, and Fig. 4 is the safety belt alarm device. Fig. 5 is a cross-sectional view taken along the line A in Fig. 2 with the alarm device for the safety belt attached to the hook, and Fig. 6 is taken along the line B in Fig. 4. FIG. 7 is a cross-sectional view, and FIG. 7 is a front view of a hook to which the safety belt alarm device is attached.

First, referring to FIG. 7, the configuration of the hook to which the safety belt alarm device is attached will be described. As shown in FIG. 7, the hook 200 includes a hook-shaped member 210, a detent member 220 that opens and closes the opening of the hook-shaped member 210, and a lock member 230 that restricts the opening and closing motion of the detent member 220. It has

The hook-shaped member 210 has a curved plate-shaped member so as to hook an object to be hung, such as a main rope or a handrail of a scaffolding, inside the opening. A connection hole 211 is formed at one end of the hook-shaped member 210 for connection with a rope (not shown) of a safety belt.

The retaining member 220 is rotatably attached to the inside of the opening of the hook-shaped member 210 by a rivet 221 at one end side thereof. The other end side of the retaining member 220 is formed so as to engage with the inner side of the tip portion of the hook-shaped member 210 . The retaining member 220 is biased by a spring 222 in a direction to close the opening of the hook-shaped member 210 .

The lock member 230 is rotatably attached to the outside of the hook-shaped member 210 by a rivet 231 at one end side thereof. The lock member 230 is biased toward the outside of the hook-shaped member 210 by a spring 232 . A slide groove 233 is formed in the lock member 230 . The slide groove 233 overlaps with a portion of the retaining member 220, and a rivet 223 provided on the retaining member 220 is inserted therethrough. The slide groove 233 is formed so that the rivet 223 of the retainer member 220 moves within the slide groove 233 as the lock member 230 rotates when the retainer member 220 closes the opening of the hook-shaped member 210 . ing. Further, the slide groove 233 is formed so that the rivet 223 moves in the slide groove 233 according to the rotation of the retaining member 220 when the lock member 230 is rotated toward the hook-shaped member 210 . .

Next, the configuration of the safety belt alarm device according to the present embodiment will be described. As shown in FIGS. 1 to 6, the safety belt alarm device 100 includes a case 110, a lever 120 and a switch 130, which constitute detection means for detecting that the hook 200 is hung on the object 10 to be hung. , a speaker 140 and a plurality of LEDs 150, which are notification means for performing a notification operation, and notification control means for controlling the notification means to notify that the suspended object 10 has been hung on the basis of the detection signal of the detection means. and a control circuit 160 .

The case 110 has a substantially U-shaped cross section so as to cover a portion of the hook-shaped member 210 of the hook 200, specifically the curved portion, from the outer edge while the inner surface thereof is exposed. The inner edge of the case 110 where the curved portion of the hook-shaped member 210 is covered is such that when the hook 200 is hung on the object 10, the object 10 does not collide with the case 110 or the impact caused by the collision is reduced. , coincide with or slightly outside the inner edge of the curved portion of the hook-shaped member 210 . In other words, the ridgeline of the inner edge of the case 110 coincides with or is located slightly inside the ridgeline of the inner edge of a part of the hook-shaped member 210 of the hook 200, specifically, the curved portion. The case 110 can be detachably fixed to the hook-shaped member 210 by pressing members (a plurality of screws 111 in this embodiment) that press the hook-shaped member 210 from both sides while sandwiching the hook-shaped member 210 in its thickness direction. there is

A box portion 112 for housing the speaker 140 , the switch 130 , and the control circuit 160 is formed at the end of the hook-shaped member 210 on the side of the connecting hole 211 in the case 110 . Further, the box portion 112 is formed with a hooking piece 113 directed outward for hooking on a different object to be hung, such as a human body belt of a safety belt or a belt of work clothes, which is not used for fall prevention. .

A groove 114 for accommodating the lever 120 is formed in one of the left and right bottom surfaces inside the curved portion of the case 110 . Lever 120 is rotatably provided in groove 114 by rivet 115 . The lever 120 is biased toward the inside of the curved portion of the hook-shaped member 210 by a spring 116 provided at the end of the lever 120 . The movable range of the lever 120 is regulated by locking pieces 117a and 117b that contact the ends of the lever 120. As shown in FIG. Here, the lever 120 normally has a curved portion of the hook-shaped member 210 of the hook 200 so that when the hook 200 is hung on the object 10 to be hung, the lever 120 abuts on the object 10 to be hung and rotates. It is located slightly inside the ridgeline of the inner edge of the

The switch 130 is a sensor that detects when the lever 120 contacts the suspended object 10 and rotates. The switch 130 is positioned such that the end of the lever 120 operates the actuator of the switch 130 when the lever 120 is rotated.

Concave portions 118 and 119 formed along the curve of the hook-shaped member 210 are formed in the upper surface and both side surfaces of the case 110 . A plurality of LEDs 150, which are light emitting elements, are provided on the bottom surfaces of the recesses 118 and 119 at intervals. The recesses 118 and 119 are so deep that the head of the LED 150 is exposed from the outer surface of the case 110 . As a result, the visibility of the LED 150 is ensured, and the LED 150 is protected from being broken by hitting an obstacle.

The speaker 140 is, for example, a piezoelectric speaker. The box portion 112 of the case 110 is provided with an acoustic hole (not shown) for emitting the sound emitted from the speaker 140 to the outside.

FIG. 8 shows a circuit diagram of the alarm device for the safety belt. As shown in FIG. 8, the switch 130, the speaker 140, and the LED 150 are connected to the control circuit 160. FIG. The control circuit 160 includes a battery and a power switch (not shown), and operates by power supply from the battery when the power switch is turned on. Control circuitry 160 includes input circuitry for switch 130 , driver circuitry for speaker 140 , and driver circuitry for LED 150 .

When the switch 130 detects the rotation of the lever 120 , the control circuit 160 uses the speaker 140 and the LED 150 to perform predetermined notification control to notify that the hook 200 has been hooked to the suspended object 10 . Specifically, for example, voice data saying "it is safe" is stored in advance in a predetermined storage unit, and control is performed such that the voice data is output from the speaker 140 a predetermined number of times (for example, twice). Further, for example, control is performed to blink all the LEDs 150 for a predetermined time (for example, 3 seconds) at predetermined intervals. Either one of the sound notification (auditory notification) and the light notification (visual notification) may be performed, or both may be performed as in the present embodiment.

As shown in FIG. 4 , the safety belt alarm device 100 is attached to the hook 200 by covering the curved portion of the hook-shaped member 210 of the hook 200 from the outside and fixing it with screws 111 . The worker turns on the power of the safety belt alarm device 100 before using the safety belt, such as before working at a high place or when moving, and pulls the hook 113 of the safety belt alarm device 100 over the safety belt. Hook it on a different suspended object than that used for fall prevention, such as a human body belt or work clothes belt. Here, since the safety belt alarm device 100 does not operate before the safety belt is used, it is possible to prevent erroneous alarms.

Then, when the worker hooks the hook 200 to the main rope or the handrail of the scaffold to use the safety belt, the lever 120 of the safety belt alarm device 100 rotates, and the speaker 140 and the LED 150 perform the alarm operation. . This allows the worker to recognize that the hook 200 of the safety belt is being used without fail.

As described above, according to the safety belt alarm device 100 according to the present embodiment, the case 110 is configured such that the hook-shaped member 210 of the hook 200 of the safety belt is partly exposed at the outer edge while the inner edge is exposed. Since it is formed so as to cover from the inside, it can be used simply by attaching it to an existing hook without preparing a dedicated hook. In addition, the detection means, the notification means, and the notification control means are provided in one case 110, and since it is a simple configuration that does not require other devices, etc., it is possible to reduce the manufacturing cost and improve the convenience of use. is also higher.

Further, according to the safety belt alarm device 100 according to the present embodiment, the case 110 holds the hook-shaped member 210 in the thickness direction and presses the hook-shaped member 210 from both sides. Since it can be fixed to the member 210, the attachment and detachment of the safety belt alarm device 100 to and from the hook 200 can be performed reliably and easily.

In addition, according to the safety belt alarm device 100 according to the present embodiment, the case 110 has a hooking piece 113 for hooking on another object to be hung, such as a human body belt of a safety belt or a belt of work clothes. is formed, it is possible to prevent the notification operation from being performed when the safety belt is not in use.

Further, according to the safety belt alarm device 100 according to the present embodiment, the LED 150 is arranged on the bottom surface of the concave portions 118 and 119 formed in the case 110 so that the head portion of the LED 150 is exposed from the outer surface of the case 110. Therefore, the visibility of the LED 150 can be ensured, and the LED 150 can be protected from being broken by hitting an obstacle.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to this. For example, although the hooking piece 113 is formed on the case 110 in the above embodiment, the hooking piece 113 may be omitted.

In the above embodiment, the lever 120 and the switch 130 are used as means for detecting that the hook 200 is hooked on the object 10 to be hung. Other sensors such as a pressure sensor may be used.

Further, in the above-described embodiment, a plurality of LEDs 150 are provided on the upper surface and side surfaces of the case 110 as light-based notification means, but the number and installation location of the LEDs 150 do not matter. Moreover, you may use things other than LED as a light emitting element.

In the above-described embodiment, the screw 111 is used as a means for detachably fixing the case 110 to the hook-shaped member 210. However, the case 110 is formed with a hook piece to hold the hook. Alternatively, the case 110 and the hook-shaped member 210 may be detachably fixed to each other by other structures such as supporting the shaped member 210 .

DESCRIPTION OF SYMBOLS 10... To-be-suspended object 100... Alarm device for safety belts 110... Case 118, 119... Recess 120... Lever 130... Switch 140... Speaker 150... LED
DESCRIPTION OF SYMBOLS 160... Control circuit 200... Hook 210... Hook-shaped member 220... Detachment prevention member 230... Lock member

Claims (6)

A safety belt alarm device used attached to a safety belt including a hook having a hook-shaped member,
a detachable case formed to cover a portion of the hook-shaped member from the outer edge while the inner edge is exposed;
provided in the case,
detection means for detecting that the hook is hung on the first object;
an informing means for performing an informing operation;
a notification control means for controlling the notification means to notify that the first suspended object has been hung on the basis of a detection signal from the detection means;
The detecting means comprises a lever that rotates in contact with the first object to be suspended when the hook is hooked on the first object to be suspended, and a sensor that detects rotation of the lever. A safety belt alarm device characterized by: The safety belt safety belt spring according to claim 1, characterized in that the case can be fixed to the hook-shaped member by pressing members that press from both sides while sandwiching the hook-shaped member in its thickness direction. information device. 3. The safety belt generator according to claim 1 or 2, wherein the case is formed with a hooking piece for hooking onto a second object to be hung such as a human body belt of the safety belt or a belt of work clothes. information device. The notification means includes an acoustic device,
4. The safety belt alerting device according to claim 1, wherein said alerting control means outputs voice from said acoustic device. 5. The safety belt alerting device according to claim 1, wherein the alerting means includes a light-emitting element provided so as to be exposed on the outer surface of the case. 6. The safety belt according to claim 5, wherein a recess is formed in the outer surface of the case, and the light emitting element is arranged on the bottom surface of the recess with its head exposed from the outer surface of the case. Alarm device.

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