JP6363583B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  The Occupational Safety and Health Act stipulates that safety belts should be used when working at heights. The safety belt includes a torso belt attached to the body of the worker, a rope having one end fixed to the torso belt, and a hook attached to the other end of the rope (see Patent Document 1). The safety belt has a function of preventing the operator from falling from a high place by locking the hook to the support.

Japanese Utility Model Publication No. 2-45765

  An operator may work at a high place without locking the hook to the support. The supervisor who supervises the worker needs to confirm that the worker is using the safety belt correctly, but when the distance between the worker and the supervisor is large, the hook is locked to the support. It may be difficult to confirm whether or not.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a display device that can easily display whether a worker is using a safety belt correctly.

  One aspect of the present disclosure is a display device that can be worn by an operator, and includes a locking unit that can lock a hook of a safety belt, a display unit that can display light, and a load applied to the locking unit. A detection unit that detects that the load is less than or equal to a preset threshold, and a display control unit that performs the display using the display unit when the detection unit detects that the load is less than or equal to the threshold. It is a display apparatus provided with.

  When the display device detects that the hook is not locked to the locking unit and the load applied to the locking unit is equal to or less than the threshold value, the display device can perform display with light.

  As a result, the display device visually recognizes that the hook is not locked to the locking unit (it is highly likely that the hook is locked to a support or the like and the safety belt is correctly used) from a distance. Can be displayed to be easy.

FIG. 4 is an explanatory diagram illustrating a configuration of a first mounting unit 1. 4 is an explanatory diagram illustrating a configuration of a second mounting unit 3. FIG. FIG. 3A is a side sectional view showing the first mounting unit 1 when the hook 33 is locked to the locking unit 9, and FIG. 3B is a side view when the hook 33 is not locked to the locking unit 9. FIG. 2 is a side sectional view showing one mounting unit 1. 3 is a block diagram illustrating an electrical configuration of the first control unit 15. FIG. 4 is a block diagram illustrating an electrical configuration of a second control unit 37. FIG. It is a flowchart showing the process which the microcomputer 21 performs. It is a flowchart showing the process which the microcomputer 45 performs.

An embodiment of the present disclosure will be described with reference to the drawings.
<First Embodiment>
1. Configuration of Display Device The configuration of the display device will be described with reference to FIGS. The display device includes a first mounting unit 1 shown in FIGS. 1 and 3 and a second mounting unit 3 shown in FIG. The first mounting unit 1 is mounted on the waist of the worker 5.

The first mounting unit 1 includes a case 7, a locking unit 9, a pair of springs 11, a switch 13, a first control unit 15, and a mounting ring 17.
The case 7 is a hollow box-like member that is open at the bottom. A pair of stoppers 19 are provided inside the side surface 7B of the case 7. The pair of stoppers 19 are provided inside the side surface 7B so as to face each other. Each stopper 19 protrudes laterally toward the stopper 19 on the opposite side.

The locking unit 9 includes a U-shaped hook receiving portion 9A that is open at the top, and a top plate portion 9B that is provided so as to close the upper opening at the hook receiving portion 9A.
As shown in FIG. 3A, the hook receiving portion 9 </ b> A can lock the hook 33. This hook 33 is a part of the well-known safety belt 27 shown in FIG. The safety belt 27 includes a body belt 25, a D ring 29, a rope 31, and a hook 33. The torso belt 25 is wound around the waist of the operator 5. The D ring 29 is attached to the waist belt 25. One end of the rope 31 is connected to the D ring 29, and the opposite end is connected to the hook 33. The hook 33 can be locked to a support such as a handrail at the work site. Further, the hook 33 can be locked to the hook receiving portion 9A as described above.

  In addition, when not working at a high place, the worker 5 can lock the hook 33 to the hook receiving portion 9A. When working at a high place, the hook 33 is removed from the hook receiving portion 9A, and the hook 33 is locked to a support at a high place.

The locking unit 9 further includes a protruding portion 9C on the top surface of the top plate portion 9B. The protruding portion 9C is a protrusion protruding upward from the top plate portion 9B.
At least the upper part of the locking unit 9 is accommodated in the case 7. At least the lower part of the hook receiving portion 9A is below the case 7 and is exposed. The locking unit 9 is suspended from the top plate portion 7 </ b> A of the case 7 by a pair of springs 11. The spring 11 is connected to the top plate portion 7A at its upper end and is connected to the top plate portion 9B at its lower end.

  The locking unit 9 can move up and down with respect to the case 7 by extending and contracting the spring 11 within a range between an upper limit position and a lower limit position described later. The locking unit 9 is biased upward by a spring 11. Therefore, when the downward load applied to the locking unit 9 is small, as shown in FIG. 3B, the spring 11 contracts and the locking unit 9 rises to the upper limit position.

  As shown in FIG. 3B, the upper limit position is a position where the protruding portion 9C pushes up the tip of a second contact 13B described later and the pushed-up second contact 13B and the first contact 13A come into contact with each other. . The locking unit 9 cannot be displaced upward from the upper limit position. Even when the locking unit 9 is in the upper limit position, the locking unit 9 is biased upward by the spring 11.

  On the other hand, when the downward load applied to the locking unit 9 is large, as shown in FIG. 3A, the spring 11 extends and the locking unit 9 moves downward from the upper limit position. The minimum load required to move the locking unit 9 in the upper limit position downward is defined as a threshold load TW. If the load applied to the locking unit 9 exceeds the threshold load TW, the locking unit 9 moves below the upper limit position. If the load applied to the locking unit 9 is equal to or less than the threshold load TW, the locking unit 9 is It is in the upper limit position.

  The load applied to the locking unit 9 when the hook 33 is locked to the locking unit 9 is larger than the threshold load TW. Therefore, when the hook 33 is locked to the locking unit 9, the locking unit 9 is below the upper limit position.

  When the downward load applied to the locking unit 9 is sufficiently large, the locking unit 9 reaches the lower limit position. The lower limit position is as follows. The top plate portion 9 </ b> B is above the pair of stoppers 19. The width of the top plate portion 9B is larger than the distance between the pair of stoppers 19. When the locking unit 9 is pulled down from the upper limit position shown in FIG. 3B, the top plate portion 9B comes into contact with the stopper 19 as shown in FIG. 3A. The position of the locking unit 9 at this time is defined as a lower limit position. The locking unit 9 cannot move downward from the lower limit position due to the contact between the top plate portion 9 </ b> B and the stopper 19. The stopper 19 corresponds to a displacement limiting unit that limits the downward displacement of the locking unit 9 to a preset range.

  The switch 13 is provided on the lower surface of the top plate portion 7A. The switch 13 includes a first contact 13A having a straight bar shape and a second contact 13B bent in a dogleg shape. Each of the first contact 13A and the second contact 13B is a conductive member. The second contact 13B is an elastically deformable member.

  The axial direction of the first contact 13A is the vertical direction. In the second contact 13B, the axial direction in the portion above the bending point is the vertical direction. Of the second contact 13B, the portion below the bending point is inclined so as to approach the first contact 13A as it goes downward. When viewed from below, the tip of the second contact 13B and the tip of the first contact 13A overlap.

  As shown in FIG. 3A, when the locking unit 9 is in the lower limit position, no force is applied to the second contact 13B, and the first contact 13A and the second contact 13B are not in contact with each other. At this time, the switch 13 is in an OFF state.

  When the locking unit 9 is displaced upward from the lower limit position, the protrusion 9C eventually comes into contact with the tip of the second contact 13B, and when the locking unit 9 is further displaced upward, the protrusion 9C is The tip of the second contact 13B is pushed upward. When the locking unit 9 is further displaced upward and reaches the upper limit position, the second contact 13B and the first contact 13A come into contact as shown in FIG. 3B. At this time, the switch 13 is turned on.

That is, the switch 13 is in an on state when the locking unit 9 is in the upper limit position, and is in an off state when the locking unit 9 is below it.
Here, as described above, when the load applied to the locking unit 9 exceeds the threshold load TW, the locking unit 9 moves downward from the upper limit position, and the load applied to the locking unit 9 is equal to or less than the threshold load TW. If present, the locking unit 9 is in the upper limit position.

  Therefore, if the load applied to the locking unit 9 exceeds the threshold load TW, the switch 13 is in an off state, and if the load applied to the locking unit 9 is equal to or less than the threshold load TW, the switch 13 is in an on state. .

  The first control unit 15 is attached to the inside of the side surface 7B. As shown in FIG. 4, the first control unit 15 includes a microcomputer (microcomputer) 21 and a wireless transmission circuit 23. The microcomputer 21 includes a CPU and a memory device. Processing executed by the microcomputer 21 will be described later.

  The means and / or function provided by the microcomputer 21 can be provided by software recorded in a substantial memory device and a computer that executes the software, only software, only hardware, or a combination thereof. For example, when the microcomputer 21 is provided by an electronic circuit which is hardware, it can be provided by a digital circuit including a large number of logic circuits or an analog circuit. The wireless transmission circuit 23 can perform wireless communication with a wireless reception circuit 49 described later.

  The mounting ring 17 is provided on the upper side of the case 7. The mounting ring 17 includes a belt hole 17A through which the body belt 25 can pass. The body belt 25 is a part of the known safety belt 27 shown in FIG. By passing the waist belt 25 through the mounting ring 17, the first mounting unit 1 can be mounted on the waist of the operator 5.

  As shown in FIG. 2, the second mounting unit 3 is mounted on a helmet 6 worn by the operator 5 on the head. The second mounting unit 3 includes a rubber belt 35, a second control unit 37, and an LED 39.

The rubber belt 35 has an annular shape and can be put on the helmet 6. The second control unit 37 includes a housing 41 and a receiving antenna 43. The casing 41 is attached to the outside of the rubber belt 35. The receiving antenna 43 is attached to the casing 41 and exposed to the outside of the casing 41. The second control unit 37 includes a microcomputer 45 housed in the casing 41 and LED driving as shown in FIG. A circuit 47 and a wireless reception circuit 49 are provided. The microcomputer 45 includes a CPU and a memory device. Processing executed by the microcomputer 45 will be described later.

  The means and / or function provided by the microcomputer 45 can be provided by software recorded in a substantial memory device and a computer that executes the software, only software, only hardware, or a combination thereof. For example, when the microcomputer 45 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a large number of logic circuits or an analog circuit.

The LED drive circuit 47 can drive the LED 39. The wireless reception circuit 49 receives a signal transmitted from the wireless transmission circuit 23 using the reception antenna 43.
The LED 39 is attached to the rubber belt 35. There are a plurality of LEDs 39, which are arranged along the circumferential direction of the rubber belt 35 at regular intervals. At least one LED 39 can be visually recognized no matter what direction the second mounting unit 3 is viewed. The LED 39 corresponds to a display unit.

  The switch 13 and the first control unit 15 correspond to a detection unit and a transmission unit. The first control unit 15 and a second control unit 37 described later correspond to a display control unit. The second control unit 37 corresponds to a receiving unit and a display execution unit. The spring 11 corresponds to an elastic member. The stopper 19 corresponds to a displacement limiting unit.

2. Processing Performed by Display Device (1) Processing Performed by First Mounting Unit 1 Processing that is repeatedly executed by the microcomputer 21 of the first mounting unit 1 every predetermined time will be described with reference to FIG. In step 1 of FIG. 6, it is determined whether or not the switch 13 is currently on. If it is in the on state, the process proceeds to step 2. If it is in the off state, the process is terminated.

  In step 2, it is determined whether or not the switch 13 is on for 5 seconds or more until the present time. If it has continued for 5 seconds or more, the process proceeds to step 3. If it has continued for less than 5 seconds, this process ends. Note that 5 seconds corresponds to the set time.

In step 3, the display signal is transmitted using the wireless transmission circuit 23.
(2) Processing Performed by Second Mounting Unit 3 Processing that the microcomputer 45 of the second mounting unit 3 repeatedly executes every predetermined time will be described with reference to FIG. In step 11 of FIG. 7, it is determined whether the display signal can be received using the wireless reception circuit 49. The display signal is a signal transmitted by the first mounting unit 1 in the process of step 3. If the display signal can be received, the process proceeds to step 12. If the display signal cannot be received, the process proceeds to step 13.

In step 12, the LED drive circuit 47 is used to turn on the LED 39 and display with light.
In step 13, the LED 39 is turned off.

3. Effect produced by display device (1A) The first mounting unit 1 can detect that the switch 13 is in an ON state. As described above, the switch 13 is in an on state in which the hook 33 is not locked to the locking unit 9 and the load applied to the locking unit 9 is equal to or less than the threshold load TW. Therefore, the first mounting unit 1 can detect a state in which the hook 33 is not locked to the locking unit 9 and the load applied to the locking unit 9 is equal to or less than the threshold load TW.

When the first mounting unit 1 detects that the hook 33 is not locked to the locking unit 9 and the load applied to the locking unit 9 is equal to or less than the threshold load TW, the first mounting unit 1 transmits a display signal.
When the second mounting unit 3 receives the display signal, the second mounting unit 3 turns on the LED 39 to display with light.

  Therefore, when the display device detects that the hook 33 is not locked to the locking unit 9 and the load applied to the locking unit 9 is equal to or less than the threshold load TW, the display device uses the LED 39 to display light. It can be carried out.

  As a result, the display device indicates that the hook 33 is not locked to the locking unit 9 (the hook 33 is locked to the support and the safety band is likely to be used correctly) from a distance. However, it can be displayed so that the visual recognition is easy.

  (1B) The first mounting unit 1 including the locking unit 9 is mounted on the waist of the worker 5. Therefore, it is easier to lock the hook 33 to the locking unit 9. The second mounting unit 3 including the LED 39 is mounted on the helmet 6. Therefore, it is easier to visually recognize the light display by the LED 39 even from a distance.

  (1C) The display device displays light by the LED 39 when the state where the load applied to the locking unit 9 is equal to or less than the threshold load TW continues for 5 seconds or more. Therefore, it is difficult to cause the LED 39 to turn on due to a disturbance factor even though the hook 33 remains locked to the locking unit 9.

  (1D) The locking unit 9 can move up and down and is biased upward by a spring 11. The locking unit 9 is displaced downward according to the load applied thereto. The first mounting unit 1 detects that the load is equal to or less than the threshold load TW based on the position of the locking unit 9. That is, the first mounting unit 1 detects that the load is equal to or less than the threshold load TW if the position of the locking unit 9 is the upper limit position.

Therefore, the display device can easily and accurately detect that the load applied to the locking unit 9 is equal to or less than the threshold load TW.
(1E) The stopper 19 restricts the displacement of the locking unit 9 to the lower limit position or a range above it. Therefore, even when an excessive load is applied to the locking unit 9, damage to the spring 11, the case 7, etc. can be suppressed.
<Other embodiments>
As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the above-mentioned embodiment, It can implement in various deformation | transformation.

  (1) The second mounting unit 3 may be mounted other than the helmet 6. For example, it may be worn on the shoulder, chest, back, arm, etc. of the worker 5. The second mounting unit 3 may be adhered to the helmet 6 with an adhesive tape, an adhesive, or the like.

(2) Instead of the LED 39, another display unit may be provided. For example, a laser light emitting device, an incandescent lamp, an organic EL display, or the like may be provided.
(3) The first mounting unit 1 may use another elastic body instead of the spring 11. Examples of other elastic bodies include rubber.

(4) The set time used in step 2 may not be 5 seconds and can be set as appropriate. For example, it may be 1 second, 10 seconds, or the like.
(5) Instead of the switch 13, another type of switch may be used. For example, a sensor including a light irradiation unit and a light receiving unit can be used. In this case, for example, if the locking unit 9 is at the upper limit position, the light emitted from the light irradiation unit is blocked by the locking unit 9 and does not enter the light receiving unit, and the locking unit 9 is not positioned at the upper limit position. If so, the light irradiated by the light irradiating unit is made incident on the light receiving unit. By doing so, the position of the locking unit 9 can be detected by the amount of light incident on the light receiving unit.

  Further, for example, if the locking unit 9 is in the upper limit position, the light emitted from the light irradiating part is reflected by the locking unit 9 and enters the light receiving unit, and if the locking unit 9 is in a position other than the upper limit position The light emitted from the light irradiation unit may not be reflected by the locking unit 9 and may not enter the light receiving unit. By doing so, the position of the locking unit 9 can be detected by the amount of light incident on the light receiving unit.

  (6) The locking unit 9 may not be substantially displaced with respect to the case 7 even when a downward load is applied thereto. In this case, a load applied to the locking unit 9 can be detected using a piezoelectric sensor, a load cell, or the like instead of the switch 13.

  (7) The functions of one constituent element in each of the above embodiments may be distributed as a plurality of constituent elements, or the functions of a plurality of constituent elements may be integrated into one constituent element. Moreover, you may abbreviate | omit a part of structure of said each embodiment as long as a subject can be solved. In addition, at least a part of the configuration of each of the above embodiments may be added to or replaced with the configuration of the other above embodiments. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... 1st mounting unit, 3 ... 2nd mounting unit, 5 ... Worker, 6 ... Helmet, 7 ... Case, 7A ... Top plate part, 7B ... Side, 9 ... Locking unit, 9A ... Hook receiving part, 9B ... top plate, 9C ... projection, 11 ... spring, 13 ... switch, 13A ... first contact, 13B ... second contact, 15 ... first control unit, 17 ... mounting ring, 17A ... belt hole, 19 ... stopper , 21 ... microcomputer, 23 ... wireless transmission circuit, 25 ... trunk belt, 27 ... safety belt, 29 ... D ring, 31 ... rope, 33 ... hook, 35 ... rubber belt, 37 ... second control unit, 39 ... LED, 41 ... Case, 43 ... Receiving antenna, 45 ... Microcomputer, 47 ... LED driving circuit, 49 ... Wireless receiving circuit

Claims (7)

A display device that can be worn by an operator,
A locking unit capable of locking the hook of the safety belt,
A display unit capable of displaying light,
A detection unit for detecting that a load applied to the locking unit is equal to or less than a preset threshold;
A display control unit that performs the display using the display unit when the detection unit detects that the load is equal to or less than the threshold;
A first mounting unit comprising at least the locking unit and the detection unit, and capable of being mounted on the waist of the operator;
Comprising at least the display unit, and a second mounting unit which can be mounted on the outside of the helmet for the operator suffered head,
A display device comprising: A display device that can be worn by an operator,
A locking unit capable of locking the hook of the safety belt,
A display unit capable of displaying light,
A detection unit for detecting that a load applied to the locking unit is equal to or less than a preset threshold;
A display control unit that performs the display using the display unit when the detection unit detects that the load is equal to or less than the threshold;
A first mounting unit comprising at least the locking unit and the detection unit, and capable of being mounted on the waist of the operator;
Comprising at least the display unit, and a second mounting unit capable of mounting in the back of the worker,
A display device comprising: The display control unit includes:
A transmission unit that transmits a display signal when the detection unit detects that the load is equal to or less than the threshold;
A receiving unit for receiving the display signal;
When the receiving unit receives the display signal, a display execution unit that performs the display using the display unit;
With
The display device according to claim 1, wherein the transmission unit is provided in the first attachment unit, and the reception unit and the display execution unit are provided in the second attachment unit.   The display device according to any one of claims 1 to 3, wherein the display control unit performs the display when a state where the load is equal to or less than the threshold value continues for a preset set time or longer. The locking unit is configured to be displaced downward according to the load,
The display device according to claim 1, wherein the detection unit detects that the load is equal to or less than the threshold value based on a position of the locking unit.   The display device according to claim 5, wherein the locking unit is configured to be movable up and down and is urged upward by an elastic member.   The display device according to claim 5, further comprising a displacement limiting unit that limits the displacement of the locking unit within a preset range.

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