Safety barrier

Abstract

A safety fence (10) comprises: a fence body (11) that is placed so as to stand on a floor surface 5a; a light-emitting device (12) that is attached to the fence body (11) and emits light; a sound output device (13) that is attached to the fence body (11) and outputs sound; a detection device (14) that is attached to the fence body (11) and is capable of detecting human; and a control device that, on the basis of signals from the detection device (14), turns on the light-emitting device (12) upon determining that there is an alarming situation in which a person is likely to enter an entry restricted area where the fence body 11 is restricting entry of human and causes the sound output device (13) to output an alert sound for alerting the person upon determining that the alarming situation has continued for a predetermined period of time.

Description

Technical Field

[0001] The present disclosure relates to a safety fence for preventing entry into a human intrusion prevention area, and preferably relates to a safety fence used during maintenance inspections of elevators and escalators.

Background Art

[0002] During maintenance inspections of elevators and escalators, it is common to install a safety fence to prevent people from entering near the landing door at the landing or the entrance to the truss. Conventionally, there is a safety fence described in Patent Document 1. This safety fence includes a fence plate to which a paper or the like with a statement calling attention such as "During inspection" is attached, a support column fixed to the fence plate, and a support plate having a fitting hole into which the lower end of the support column is press-fitted. This safety fence stands on the floor surface by the support plate supporting the support column.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the above safety fence is configured to attach a paper or the like with a statement calling attention to the fence plate, visually impaired people cannot recognize the safety fence. In addition, children and the elderly who are engrossed in play are unlikely to notice the safety fence. Therefore, an object of the present disclosure is to provide a safety fence that is easy for people to notice, can effectively suppress people from entering a dangerous area, and is easy for visually impaired people, children, and the elderly to recognize.

Means for Solving the Problems

[0005] To solve the above problems, the safety fence according to this disclosure comprises: a fence body arranged to stand upright on a mounting surface; a light-emitting device attached to the fence body that emits light; a sound-emitting device attached to the fence body that emits sound; a detection device attached to the fence body that can detect people; and a control device that, based on a signal from the detection device, determines that there is a notification state in which a person may enter an intrusion-blocking area that the fence body is blocking from human intrusion, and turns on the light-emitting device, and determines that the notification state has continued for a predetermined time, causes the sound-emitting device to emit a warning sound to draw attention.

[0006] The above notification state only needs to be based on information from the detection device. More specifically, the control device may determine that the above notification state is in effect when the detection device detects a person. Alternatively, the control device may determine that the notification state is in effect when the intensity of the person detection signal from the detection device is above a predetermined intensity. Alternatively, the control device may determine that the above notification state is in effect when the distance between the detection device and the person falls below a predetermined distance. Alternatively, the control device may determine that the above notification state is in effect when it determines, based on the signal from the detection device, that a person has entered a predetermined area.

[0007] According to this disclosure, when the control device determines, based on a signal from the detection device, that a person may be entering an area where entry is prohibited by the fence, it turns on a light-emitting device, such as a lamp. Therefore, it is easy to recognize that a person is approaching the area where entry is prohibited, and entry into the area can be effectively deterred.

[0008] Furthermore, when the control device determines that the notification state has continued for a predetermined period of time, it causes the sound output device to emit a warning sound to draw attention. Therefore, even people who are prone to overlooking safety fences, such as visually impaired people, children engrossed in play, and the elderly, can easily recognize that they are approaching the restricted area. This further effectively deters people from entering the restricted area, resulting in a highly safe safety fence.

[0009] Furthermore, when an alert is triggered, the light-emitting device illuminates, and only if the situation where a person might enter the restricted area does not improve after a predetermined time has elapsed, is a warning sound emitted. Therefore, the frequent emission of the warning sound can be suppressed, and people near the safety fence will not feel uncomfortable due to the frequent emission of the warning sound.

[0010] Furthermore, the device includes a plurality of light-emitting units attached to the fence body at intervals along the installation surface of the fence body, the detection device is capable of detecting relative position information relating to the relative position of a person with respect to the fence body, and the control device may, when in the notification state, illuminate the proximity light-emitting unit closest to the person among the plurality of light-emitting units based on the relative position information.

[0011] Furthermore, when the control device is in notification mode, it may illuminate one or more light-emitting units in addition to the proximity light-emitting unit based on the relative position information. An example of a detection device capable of detecting relative position information regarding a person's relative position to the fence body is a detection device that includes multiple detection units attached to the fence body at intervals along the direction of installation surface, where each detection unit includes an ultrasonic transmitter and an ultrasonic receiver.

[0012] According to this configuration, when the control device is in a notification state, it illuminates the nearest proximity light-emitting unit among the multiple light-emitting units, based on the relative position information mentioned above. Therefore, it is easier for people to notice the illumination of the light-emitting unit, and the notification state can be quickly resolved.

[0013] Furthermore, the detection device is capable of detecting relative position information relating to the relative position of a person with respect to the fence body, the sound output device is capable of varying the maximum output direction in which the output of the warning sound is greatest, and the control device may vary the maximum output direction based on the relative position information so that the volume of the warning sound at the relative position increases when the notification state continues for a predetermined time.

[0014] Examples of sound output devices capable of varying the maximum output direction include a sound output device equipped with multiple speakers (directional speakers are preferable) attached to the fence body at intervals along the direction of installation, and a sound output device equipped with actuators (e.g., motors) that can change the orientation (direction) of the speakers.

[0015] According to this configuration, the control device adjusts the maximum output direction based on relative position information so that the volume of the warning sound at the relative location increases when the notification state continues for a predetermined time. Therefore, people are more likely to notice the warning sound, and people entering the restricted area can be more effectively deterred.

[0016] Furthermore, the device includes a speed detection unit capable of detecting an approach correlation speed that correlates with the approach speed at which a person approaches the fence body. When the control device determines that the approach correlation speed is equal to or greater than a first predetermined speed, it shortens the predetermined time and increases the volume of the warning sound, compared to the case where the approach correlation speed is within a predetermined speed range smaller than the first predetermined speed.

[0017] As an example of a speed detection unit capable of detecting the above-mentioned proximity correlation speed, one could consider a speed detection unit that includes an ultrasonic sensor capable of detecting the distance to a person as an example of a detection device, and a timer capable of measuring elapsed time.

[0018] In this configuration, if a warning sound is emitted a short time after the system becomes alerted when a person approaches the safety fence at a speed exceeding a predetermined speed, it is possible to effectively prevent a person from entering the restricted area before the warning sound is emitted. Furthermore, even if the volume of the warning sound is increased when a person approaches the safety fence at a speed exceeding a first predetermined speed, it is still possible to effectively prevent a person from entering the restricted area.

[0019] Furthermore, the control device is equipped with a speed detection unit capable of detecting an approach correlation speed that correlates with the approach speed at which a person approaches the fence body, and the control device is equipped with a speed detection unit that can detect an approach correlation speed that correlates with the approach speed at which a person approaches the fence body. correlationWhen it is determined that the speed is equal to or lower than the second predetermined speed, the approach correlation In comparison with the case where the speed is included in a predetermined speed range greater than the second predetermined speed, the volume of the warning sound may be increased.

[0020] The elderly not only have difficulty noticing the safety fence, but may also have difficulty hearing sounds.

[0021] According to this configuration, when the approach correlation When it is determined that the speed is equal to or lower than the second predetermined speed, the volume of the warning sound increases. Therefore, since it becomes easier for the elderly with a slow walking speed to notice the warning sound, it is possible to effectively suppress the elderly from entering the restricted area.

[0022] Further, the detection device can detect distance information regarding the distance from a person, and the control device may increase the volume of the warning sound stepwise or continuously as the distance decreases.

[0023] According to this configuration, since the volume of the warning sound increases stepwise or continuously as a person approaches the restricted area, it is possible to effectively suppress the person from entering the restricted area.

[0024] Further, the warning sound may be a voice of words effective in preventing a person from entering the restricted area.

[0025] Examples of words effective in preventing a person from entering the restricted area include, for example, "It is dangerous to approach the safety fence.", "Please move to a position away from the safety fence.", "There is a restricted area ahead.", etc.

[0026] According to this configuration, a person can recognize that there is a restricted area ahead based on the content of the voice. Therefore, it is possible to effectively suppress the person from entering the restricted area.

[0027] Furthermore, the device includes a cable for supplying power from a power source to the light-emitting device, the sound output device, and the detection device, and a cable storage section for housing the cable, and the length of the cable may be 2m or more.

[0028] In elevators, the height distance from the lowest floor to the pit in the elevator shaft is often 2 meters or more. Furthermore, a large portion of maintenance and inspection work involves pit work, which is often performed with a safety fence installed on the floor of the lowest level. Currently, there are no safety fences with power cables exceeding 2 meters in length. Given this background, using an extremely long power cable of 2 meters or more for a safety fence would allow power to be supplied to the electrical components of the safety fence via an outlet in the pit, resulting in significant improvements in power supply. On the other hand, using an extremely long power cable of 2 meters or more may worsen the ease of transporting and handling the safety fence.

[0029] However, with this configuration, since it includes a cable storage section for storing cables, even if extremely long cables are used, the cables can be efficiently stored in a small space, and the ease of transporting and handling of the safety fence is hardly deteriorated. Therefore, it is possible to simultaneously obtain the conflicting effects of good power supply performance and good ease of transporting and handling of the safety fence, resulting in remarkable and exceptional effects.

[0030] Furthermore, as the cable storage section, a cable storage section having a structure similar to that of a hose winding machine can be suitably adopted, comprising a mounting section, a winding body that is rotatable relative to the mounting section and around which the hose is wound, and a handle attached to the winding body that allows the winding body to rotate rotatably relative to the mounting section. Alternatively, as the cable storage section, a cable storage section having a structure similar to that of a vacuum cleaner's cable storage structure using a coil spring can be suitably adopted. [Effects of the Invention]

[0031] According to this disclosure, it is possible to create a safety fence that is easily noticeable to people, effectively deterring people from entering dangerous areas, is easily recognizable by visually impaired people, children, and the elderly, and effectively deterring people from entering restricted areas. [Brief explanation of the drawing]

[0032] [Figure 1] This is a front view of a safety fence according to one embodiment of the present disclosure, which prevents people from approaching the elevator shaft, as seen from the outside in the depth direction of the elevator shaft. [Figure 2] This is a plan view of the safety fence shown above, seen from above in the vertical direction. [Figure 3] This is a block diagram showing the main components of a safety fence. [Figure 4] This flowchart illustrates an example of the control system for a safety fence designed to prevent people from entering restricted areas. [Figure 5] This is a schematic diagram explaining the principle of triangulation. [Modes for carrying out the invention]

[0033] The embodiments relating to this disclosure will be described in detail below with reference to the attached drawings. Note that if multiple embodiments or modifications are included below, it is intended from the outset that new embodiments may be constructed by appropriately combining their characteristic features. Furthermore, in the following embodiments, the same reference numerals are used for the same components in the drawings, and redundant explanations are omitted. Also, multiple drawings include schematic diagrams, and the dimensional ratios such as length, width, and height of each component do not necessarily match between different drawings. Furthermore, among the components described below, those not described in the independent claim indicating the highest-level concept are optional components and not essential components. Also, the MKS unit system is assumed to be used as the unit of each physical quantity below.

[0034] Figure 1 is a front view of a safety fence 10 according to one embodiment of the present disclosure, which prevents people from approaching the hoistway of elevator 1, as seen from the outside in the depth direction of the hoistway, and Figure 2 is a plan view of the safety fence 10 as seen from the vertically upward side. As shown in Figure 1, the safety fence 10 comprises a fence body 11 positioned to stand upright on the floor surface 2a of the landing 2, a light-emitting device 12 attached to the fence body 11 that emits light, a sound-emitting device 13 attached to the fence body 11 that emits sound, a detection device 14 attached to the fence body 11 that can detect people, a timer 15 (see Figure 3), and a control device 40 (see Figure 3). The floor surface 2a of the landing 2 is an example of a mounting surface.

[0035] The fence body 11 can have any structure as long as it has a side whose normal is substantially parallel to the horizontal direction when the floor surface 2a is substantially parallel to the horizontal plane, and which can block the passage of people. Any structure used in a wide variety of known safety fences can be adopted for the fence body 11. The fence body 11 may have, for example, one or more wall sections, and if it has multiple wall sections, the relative position of the other wall sections with respect to one wall section may be made variable.

[0036] The fence body 11 may have, for example, a first wall section 11a, a second wall section 11b, and a third wall section 11c, as shown in Figure 1. Each wall section 11a, 11b, and 11c may include a flat plate section made of wood or resin. Alternatively, each wall section 11a, 11b, and 11c may include a structure in which a sheet material made of cloth or resin is attached to a metal or resin frame, and the sheet material may include sides that obstruct the passage of people.

[0037] In this embodiment, each wall section 11a, 11b, and 11c includes a flat plate made of wood or resin, and is structured similarly to a folding screen, allowing each wall section 11a, 11b, and 11c to stand upright. Specifically, each wall section 11a, 11b, and 11c has a sufficient area to maintain its upright position and has a long, narrow, and roughly rectangular mounting surface. In addition, each wall section 11a, 11b, and 11c has column sections (support sections) 21a, 21b, and 21c on both sides in the width direction when in the upright position. In the upright position of the fence body 11, the second wall section 11b is located on one side of the first wall section 11a in the width direction, and the third wall section 11c is located on the other side of the first wall section 11a in the width direction.

[0038] For example, two adjacent column sections 21a, 21b, and 21c are surrounded by the same loop-shaped band or string member (not shown) with a restricted height position, and are constrained by the band or string member so that their relative positions can be varied but they cannot be separated. This configuration can be easily realized, for example, by providing through holes for the band or string member to pass through at the same height portion around the widthwise ends of adjacent wall sections 11a, 11b, and 11c. The safety fence 10 is transported in a folded state so that each wall section 11a, 11b, and 11c overlaps in the thickness direction of wall section 11a.

[0039] As shown in Figures 1 and 2, the fence body 11 is erected on the floor surface 2a of the landing 2 so as to surround the lower part of the opening 4 created when the landing door 7 is opened. In the example shown in Figure 1, the first wall portion 11a is erected approximately parallel to the opening 4 in the width direction center of the opening 4, facing the depth direction of the elevator shaft 6. The second wall portion 11b is erected so as to close most of the gap between one end of the first wall portion 11a in the width direction and the wall portion 9a located on the same width direction side of the opening 4 in the building 9. The third wall portion 11c is erected so as to close most of the gap between the other end of the first wall portion 11a in the width direction and the wall portion 9b located on the other width direction side of the opening 4 in the building 9.

[0040] The light-emitting device 12 has a first light-emitting section 12a, a second light-emitting section 12b, and a third light-emitting section 12c. The sound output device 13 has a first sound output section 13a, a second sound output section 13b, and a third sound output section 13c. The detection device 14 has a first detection section 14a, a second detection section 14b, and a third detection section 14c. The first light-emitting section 12a, the first sound output section 13a, and the first detection section 14a are mounted on the outer surface of the first wall section 11a opposite to the entry-restricted area, and the second light-emitting section 12b, the second sound output section 13b, and the second detection section 14b are mounted on the outer surface of the second wall section 11b opposite to the entry-restricted area. The third light-emitting section 12c, the third sound output section 13c, and the third detection section 14c are mounted on the outer surface of the third wall section 11c opposite to the entry-restricted area.

[0041] The light-emitting units 12a, 12b, 12c, sound output units 13a, 13b, 13c, and detection units 14a, 14b, 14c are preferably installed in the center of the width direction of the wall sections 11a, 11b, 11c to which they are mounted. The light-emitting surfaces of each light-emitting unit 12a, 12b, 12c are exposed to the outside of the outer surface of the wall sections 11a, 11b, 11c to which they are mounted, and the speakers of the sound output units 13a, 13b, 13c are exposed to the outside of the outer surface of the wall sections 11a, 11b, 11c to which they are mounted. The detection surfaces of the detection units 14a, 14b, 14c are also exposed to the outside of the outer surface of the wall sections 11a, 11b, 11c to which they are mounted.

[0042] Each light-emitting unit 12a, 12b, and 12c has a light source, such as one or more LEDs (Light Emitting Diodes), one or more organic EL (Electro Luminescence) elements, one or more inorganic EL elements, one or more incandescent lamps, or one or more fluorescent lamps. Each light-emitting unit 12a, 12b, and 12c also has a switching unit (not shown) composed of transistors or the like, and the control device 40 controls each switching unit to be on or off. For example, if the light source includes LEDs, the light-emitting device 12 has a power conversion unit that converts AC power from the commercial power supply to DC power and steps down the voltage. When the control device 40 controls a switching unit to be on, DC power is supplied from the power conversion unit to the LED corresponding to the switched unit that has been controlled to be on, and as a result the corresponding LED emits light. The control device 40 and the power conversion unit are installed, for example, inside the fence body 11.

[0043] Each sound output unit 13a, 13b, and 13c has a voice generation unit (not shown) that generates synthesized sound under the control of the control device 40, and speakers 23a, 23b, and 23c electrically connected to the voice generation unit. The synthesized sound is synthesized by the voice generation unit based on a signal from the control device 40, and the automated voice produced by the synthesized sound is output from speakers 23a, 23b, and 23c. The synthesized sound output by speakers 23a, 23b, and 23c will be described later.

[0044] Each detection unit 14a, 14b, and 14c includes a human presence sensor, for example, an ultrasonic sensor. The ultrasonic sensor emits ultrasonic waves towards a person using a transmitter and receives the reflected waves with a receiver to detect the presence or absence of a person and the distance to the person. The distance from the ultrasonic sensor to the person can be calculated by calculating the relationship between the time required from the emission to the reception of the ultrasonic waves and the speed of sound. More specifically, the ultrasonic sensor includes, for example, an ultrasonic AFE (analog front end) (not shown) and ultrasonic transducers 24a, 24b, and 24c.

[0045] The ultrasonic AFE receives a start trigger from the control device 40 and generates a pulse waveform. The ultrasonic transducers 24a, 24b, and 24c convert the electrical signal into ultrasound, output a transmission wave, and then receive the reflected wave reflected by the person. The ultrasonic transducers 24a, 24b, and 24c generate an electrical signal based on the received reflected wave and return it to the ultrasonic AFE. The ultrasonic AFE receives weak signals with high sensitivity. The ultrasonic AFE transmits a stop trigger containing TOF (Time of Flight) information to the control device 40. The control device 40 calculates the distance between the person and the ultrasonic transducers 24a, 24b, and 24c, for example, based on the time difference between the start trigger and the stop trigger.

[0046] For ultrasound, for example, a bandwidth of 30 kHz to 10 MHz can be used. The detection units 14a, 14b, and 14c are sets of a transmitter and a receiver. When ultrasound (sound pulse) is blocked by a person, it changes from a state with no obstacles to a state with reflection. The control device 40 detects people, etc., based on this change. TOF stands for Time of Flight, and it is a method of measuring distance, etc., by measuring the time it takes for something to be emitted to reflect back from an object.

[0047] The first detection unit 14a detects whether a person has entered a first area where notification to a person is considered necessary, within the area surrounding the region that overlaps with the normal direction of the outer surface of the first wall 11a. The second detection unit 14b detects whether a person has entered a second area where notification to a person is considered necessary, within the area surrounding the region that overlaps with the normal direction of the outer surface of the second wall 11b. The third detection unit 14c detects whether a person has entered a third area where notification to a person is considered necessary, within the area surrounding the region that overlaps with the normal direction of the outer surface of the third wall 11c.

[0048] The first and second regions do not have to overlap, but a part of the first region and a part of the second region may overlap. Similarly, the first and third regions do not have to overlap, but a part of the first region and a part of the third region may overlap. The control device 40 can narrow down the relative region in which a person exists relative to the fence body 11 by identifying the detection units 14a, 14b, and 14c that have detected a person. In other words, the detection device 14 is capable of detecting relative position information regarding the relative position of a person with respect to the fence body 11.

[0049] As shown in Figure 2, the safety fence 10 includes a cable 30 for supplying power from a commercial power source to a light-emitting device 12, a sound output device 13, and a detection device 14, and a cable storage section 35 for housing the cable 30. The length of the cable 30 is 2m or more. The cable storage section 35 includes a mounting section, a winding body 31 that is rotatable relative to the mounting section and around which the cable 30 is wound, and a handle 32 attached to the side of the winding body 31 for rotating the winding body 31 relative to the mounting section. The cable storage section 35 has a structure similar to that of a hose winding machine used for watering applications. The cable storage section 35 may also have a structure similar to that of a cable storage structure using a coil spring in a vacuum cleaner.

[0050] Figure 1 shows the safety fence 10 installed at the landing 2 on the lowest floor of the elevator 1. The safety fence 10 has an extremely long cable 30, which is more than 2 meters long. The cable 30 extends from the fence body 11, passes through the opening 4, and then extends vertically downward through the hoistway 6 to the pit. The plug covering the end of the cable 30 is connected to an outlet provided in the pit. In this way, power is supplied to the electrical components 12, 13, and 14 via the outlet in the pit.

[0051] In elevator 1, the height distance from the lowest floor to the pit in the hoistway 6 is often 2m or more. Furthermore, maintenance and inspection work largely involves pit work, which is often performed with the safety fence 10 installed on the floor surface 2a of the landing 2 on the lowest floor. Against this backdrop, since the cable 30 of this safety fence 10 is extremely long, exceeding 2m, power can be easily supplied to the electrical components 12, 13, and 14 of the safety fence 10 using an outlet provided in the pit during pit work.

[0052] Furthermore, because it is equipped with a cable storage section 35 for storing the cable 30, even if an extremely long cable 30 is used, the cable 30 can be efficiently stored in a small space, and the ease of transport and handling of the safety fence 10 is hardly deteriorated. Therefore, it is possible to obtain the remarkable and exceptional effect of simultaneously achieving two conflicting effects: good power supply performance and good ease of transport and handling of the safety fence 10.

[0053] Figure 3 is a block diagram showing the main components of the safety fence 10. As shown in Figure 3, the control device 40 is preferably configured by a computer, such as a microcomputer, and includes a control unit 41 and a storage unit 42. The control unit 41, i.e., the processor, includes, for example, a CPU (Central Processing Unit). The storage unit 42 is composed of a hard disk drive (HDD), a solid-state drive (SSD), etc., and may include non-volatile memory such as ROM (Read Only Memory) and volatile memory such as RAM (Random Access Memory). The storage unit 42 may consist of only one storage medium or may consist of multiple different storage mediums. The CPU reads and executes programs, etc., that are pre-stored in the storage unit 42. The non-volatile memory pre-stores control programs, predetermined thresholds, etc. The volatile memory temporarily stores the read programs and processing data.

[0054] As shown in Figure 3, the control device 40 receives signals from the first detection unit 14a, the second detection unit 14b, and the third detection unit 14c. The control device 40 also communicates bidirectionally with the timer 15. The timer 15 is installed, for example, inside the fence body 11. Based on the signals received from at least one of the three detection units 14a, 14b, 14c and the timer 15, the control device 40 controls at least one of the three light-emitting units 12a, 12b, 12c and the three sound-output units 13a, 13b, 13c.

[0055] Figure 4 is a flowchart illustrating an example of the control of the control device 40 of the safety fence 10 for preventing people from entering the restricted area. The first light-emitting unit 12a, the first sound output unit 13a, and the first detection unit 14a operate in association, the second light-emitting unit 12b, the second sound output unit 13b, and the second detection unit 14b operate in association, and the third light-emitting unit 12c, the third sound output unit 13c, and the third detection unit 14c operate in association.

[0056] Furthermore, the first light-emitting unit 12a, the first sound output unit 13a, and the first detection unit 14a operate independently of each other, as do the second light-emitting unit 12b, the second sound output unit 13b, and the second detection unit 14b, and the third light-emitting unit 12c, the third sound output unit 13c, and the third detection unit 14c. Below, as an example, we will describe the operation performed using the first light-emitting unit 12a, the first sound output unit 13a, and the first detection unit 14a to prevent people from entering the restricted area. The operation using the second light-emitting unit 12b, the second sound output unit 13b, and the second detection unit 14b is the same as the operation using the third light-emitting unit 12c, the third sound output unit 13c, and the third detection unit 14c.

[0057] Referring to Figure 4, once the safety fence 10 is properly installed on the landing 2 and the plug on the end of the cable 30 is connected to the outlet, the control starts, and in step S1, the control device 40 determines whether or not it has detected a person based on the signal from the first detection unit 14a. This can be easily done by the first detection unit 14a determining whether or not the reflected wave contains a bounce component. The control device 40 determining that it has detected a person based on the signal from the first detection unit 14a is equivalent to the control device 40 determining that it is in a notification state where there is a possibility that a person may enter the entry restriction area where the fence body 11 is preventing people from entering. If the determination in step S1 is negative, the control returns, and steps S1 and below are repeated.

[0058] On the other hand, if a positive determination is made in step S1, the process proceeds to step S2, in which the control device 40 causes the first light-emitting unit 12a to emit light. This is done by controlling the switching unit corresponding to the first light-emitting unit 12a to be ON. In step S3, following step S2, the control device 40 determines, based on the signal from the first detection unit 14a and the signal from the timer 15, whether the speed at which a person approaches the first detection unit 14a is equal to or greater than a first predetermined speed.

[0059] The control device 40 determines the distance L1 [m] between the person and the first detection unit 14a at time T1 and the distance L2 [m] between the person and the first detection unit 14a at time T2 (a time later than time T1) based on the signal from the first detection unit 14a. The control device 40 determines the elapsed time t [s] from time T1 to time T2 based on information from the timer 15. The control device 40 calculates the speed at which the person approaches the first detection unit 14a from the following equation (1). When the control device 40 determines that the distance has reached L1, it outputs a signal to the timer 15 indicating the start of timing, and when the distance has reached L2, it outputs a signal to the timer 15 indicating the end of timing and a signal to transmit information that can identify the elapsed time. Based on this output, the control device 40 determines the elapsed time t based on the information that can identify the timing transmitted from the timer 15. ((L1-L2) / t)[m / s]···(1)

[0060] If a positive determination is made in step S3, in step S4, the control device 40 sets the volume level output by the first sound output unit 13a to the first volume level [dB (decibels)] and sets the predetermined time until sound output to the first predetermined time [s]. The information on the first volume level and the information on the first predetermined time are stored in the storage unit 42 in advance.

[0061] In step S5, following step S4, the control device 40 determines whether or not it has detected a person for a first predetermined time based on the signal from the first detection unit 14a and the signal from the timer 15. When the control device 40 first detects a person based on the signal from the first detection unit 14a, it outputs a signal to the timer 15 indicating the start of timing. Also, when the control device 40 can no longer detect a person based on the signal from the first detection unit 14a, it outputs a signal to the timer 15 indicating the end of timing and a signal to transmit information that can specify the time (elapsed time). Based on the information that can specify the timing transmitted based on this output, the control device 40 determines the time for which a person was continuously detected. If the determination in step S5 is negative, the process moves to step S9, where the control device 40 turns off the first light-emitting unit 12a, and then the control returns, and steps S1 and below are repeated.

[0062] On the other hand, if a positive determination is made in step S5, the process proceeds to step S6, where the control device 40 controls the first sound output unit 13a to output a warning sound at a first volume level. The sound should contain any wording that is effective in preventing people from entering the restricted area. Possible wording for the sound could be, for example, "It is dangerous to approach the safety fence," "Please move to a position away from the safety fence," or "There is a restricted area ahead."

[0063] The first volume level is set higher than the second volume level, which will be explained later, and the first predetermined time is set shorter than the second predetermined time, which will be explained later. In this way, a warning sound can be output shortly after the first light-emitting unit 12a lights up, and at a loud volume, for people approaching the safety fence 10 at high speed. Therefore, it is possible to effectively deter people approaching the safety fence 10 at high speed from entering the restricted area.

[0064] In step S7, following step S6, the control device 40 determines whether or not it has detected a person based on the signal from the first detection unit 14a. If the determination in step S7 is positive, steps S6 and below are repeated. On the other hand, if the determination in step S7 is negative, the process moves to step S8, where the control device 40 turns off the first light-emitting unit 12a and stops the audio output of the first sound output unit 13a, after which the control returns, and steps S1 and below are repeated.

[0065] Next, we will explain the case where a negative determination is made in step S3. If a negative determination is made in step S3, the process proceeds to step S10, where the control device 40 determines, based on the signal from the first detection unit 14a and the signal from the timer 15, whether the speed at which the person approaches the first detection unit 14a is less than or equal to the second predetermined speed. The speed at which the person approaches the first detection unit 14a is calculated using the method described in step S3.

[0066] If a positive determination is made in step S10, the process proceeds to step S11, in which the control device 40 sets the volume level output by the first sound output unit 13a to the first volume level [dB (decibels)] and sets the predetermined time until sound output to the second predetermined time [s] (> first predetermined time [s]). The information for the second predetermined time [s] is stored in the storage unit 42 in advance.

[0067] In step S12, following step S11, the control device 40 determines whether or not it has detected a person for a second predetermined time based on the signal from the first detection unit 14a and the signal from the timer 15. The method for determining the duration for which a person was continuously detected is the same as the method described in step S5. If the determination in step S12 is negative, the control from step S9 onward is repeated, while if the determination in step S5 is positive, the control from step S6 onward is repeated.

[0068] Many elderly people walk slowly and have weakened hearing. In this embodiment, when a person approaches the first detection unit 14a slowly and approaches the intrusion prevention area slowly, the time until sound is output is delayed. Therefore, frequent sound output can be suppressed, and people around the landing can be prevented from feeling uncomfortable due to the sound output. In addition, the sound level of the sound output when a person walking slowly is detected continuously for a second predetermined time is set higher than the second volume level which will be explained later, so that even elderly people with weakened hearing can be reliably notified of the warning sound.

[0069] Finally, the control in the case where a negative determination is made in step S10 will be explained. If a negative determination is made in step S10, the process proceeds to step S13, where the control device 40 sets the volume level output by the first sound output unit 13a to the second volume level [dB] (< first volume level [dB]) and sets the predetermined time until sound output to the third predetermined time [s] (second predetermined time > third predetermined time > first predetermined time). The information for the second volume level [dB] and the information for the third predetermined time [s] are stored in the storage unit 42 in advance.

[0070] In step S14, following step S13, the control device 40 determines whether or not it has continuously detected a person for a third predetermined time based on the signal from the first detection unit 14a and the signal from the timer 15. The method for determining the duration of continuous detection of a person is the same as the method described in step S5. If the determination in step S14 is negative, the control from step S9 onward is repeated.

[0071] On the other hand, if a positive determination is made in step S14, the process proceeds to step S15. In step S15, the control device 40 controls the first sound output unit 13a to output a warning sound at the second volume level. The sound should contain words that are effective in preventing people from entering the restricted area. The same words as those exemplified in step S6 can be used for the sound.

[0072] In this embodiment, the second volume level is lower than the first volume level. More specifically, the volume level of the sound is lower compared to cases where the person approaching the restricted area is moving quickly and it is an emergency, or when the person approaching the restricted area is moving slowly and is likely to be elderly. Therefore, since the volume level is lower compared to cases where there is a particular need, it is possible to suppress the discomfort felt by people around the landing due to the sound output.

[0073] In step S16, following step S15, the control device 40 determines whether or not it has detected a person based on the signal from the first detection unit 14a. If the determination in step S16 is positive, steps S15 and below are repeated. On the other hand, if the determination in step S16 is negative, the process moves to step S8, where the control device 40 turns off the first light-emitting unit 12a and stops the audio output of the first sound output unit 13a. After that, the control returns, and steps S1 and below are repeated. The control in Figure 4 ends, for example, when the plug is removed from the outlet.

[0074] As described above, the safety fence 10 comprises a fence body 11 positioned to stand upright relative to the floor surface (mounting surface) 5a, a light-emitting device 12 attached to the fence body 11 that emits light, a sound-emitting device 13 attached to the fence body 11 that emits sound, a detection device 14 attached to the fence body 11 that can detect people, and a control device 40 that, based on a signal from the detection device 14, determines that there is a possibility of a person entering the restricted area where the fence body 11 is preventing human intrusion, and lights up the light-emitting device 12, and if it determines that the restricted state has continued for a predetermined time, it outputs a warning sound to the sound-emitting device 13 to draw attention.

[0075] According to this disclosure, the control device 40, based on a signal from the detection device 14, illuminates the light-emitting device 12 when it determines that there is a possibility that a person may enter the restricted area that is blocked by the fence body 11. Therefore, it is easy to recognize that a person is approaching the restricted area, and it is possible to effectively deter people from entering the restricted area.

[0076] Furthermore, when the control device 40 determines that the notification state has continued for a predetermined period of time, it causes the sound output device 13 to output a warning sound to draw attention. Therefore, even people who are prone to overlooking the safety fence 10, such as visually impaired people, children engrossed in play, and the elderly, can easily recognize that they are approaching the restricted area. This further effectively deters people from entering the restricted area, resulting in a highly safe safety fence.

[0077] Furthermore, when a notification state is triggered, the light-emitting device 12 is activated, and only if the situation where a person may enter the restricted area does not improve after a predetermined time has elapsed, is a warning sound emitted. Therefore, the frequent emission of the warning sound can be suppressed, and people around the safety fence 10 will not feel uncomfortable due to the frequent emission of the warning sound.

[0078] Furthermore, the fence body 11 may be equipped with a plurality of light-emitting units 12a, 12b, 12c attached to it at intervals along the floor surface 2a of the fence body 11. The detection device 14 may also be capable of detecting relative position information regarding the relative position of a person with respect to the fence body 11. When the control device 40 is in a notification state, it may illuminate the proximity light-emitting unit that is closest to the person among the plurality of light-emitting units 12a, 12b, 12c based on the relative position information. This can be achieved, for example, by illuminating the light-emitting units 12a, 12b, 12c attached to the same wall sections 11a, 11b, 11c as the detection units 14a, 14b, 14c that detected the person, as proximity light-emitting units, as explained in the flowchart above. The control device 40 may also illuminate one or more other light-emitting units in addition to the proximity light-emitting units based on the relative position information when the control device 40 is in a notification state.

[0079] According to this configuration, when the control device 40 is in a notification state, it lights up the proximity light-emitting device that is closest to the person among the multiple light-emitting units 12a, 12b, and 12c based on the relative position information. Therefore, it is easy for a person to notice the lighting of the light-emitting device 12, and it is easy to quickly resolve the notification state.

[0080] Furthermore, the detection device 14 can detect relative position information regarding the relative position of a person with respect to the fence body 11, and the sound output device 13 may be able to vary the maximum output direction in which the output is loudest for the warning sound. In addition, the control device 40 may vary the maximum output direction based on the relative position information so that the volume of the warning sound at the relative position increases when the notification state continues for a predetermined time. This can be achieved, for example, by illuminating the sound output units 13a, 13b, 13c that are attached to the same wall sections 11a, 11b, 11c as the detection units 14a, 14b, 14c that detected a person, and are closest to the detected person, as explained in the flowchart shown in Figure 4.

[0081] As an example of a sound output device in which the maximum output direction can be varied, a sound output device 13 can be considered that has multiple speakers (directional speakers are preferable) attached to the fence body 11 at intervals along the floor surface (installation surface) 3a, as described in detail above. Another example of a sound output device in which the maximum output direction can be varied is a sound output device equipped with an actuator (e.g., a motor) that can change the orientation (direction) of the speakers.

[0082] According to this configuration, the control device 40 changes the maximum output direction based on relative position information so that the volume of the warning sound at the relative location increases when the notification state continues for a predetermined time. Therefore, people are more likely to notice the warning sound, and people entering the restricted area can be more effectively deterred.

[0083] Furthermore, the device may be equipped with a speed detection unit capable of detecting an approach correlation speed that correlates with the approach speed at which a person approaches the fence body 11. In addition, if the control device 40 determines that the approach correlation speed is equal to or greater than a first predetermined speed, it may shorten the predetermined time and increase the volume of the warning sound, compared to the case where the approach correlation speed is in a predetermined speed range smaller than the first predetermined speed.

[0084] In this embodiment, each detection unit 14a, 14b, 14c and the timer 15 constitute a speed detection unit and calculate the approach speed as the object approaches each detection unit 14a, 14b, 14c. This approach speed is also correlated with the approach correlation speed, which is correlated with the approach speed at which a person approaches the fence body 11. Furthermore, the predetermined speed range V [m / s] in which the approach correlation speed is smaller than the first predetermined speed is set to the range of equation (2) shown below. In equation (2), the first predetermined speed is the first predetermined speed shown in step S3 of Figure 4, and the second predetermined speed is the second predetermined speed shown in step S10 of Figure 4. 1st predetermined speed [m / s]>V[m / s]>2nd predetermined speed [m / s]...(2)

[0085] In this embodiment, when a person approaches the fence body 11 at a speed exceeding a predetermined speed, a warning sound is output a short time after the notification state is activated, so that it is possible to effectively prevent a person from entering the restricted area before the warning sound is output. In addition, when a person approaches the fence body 11 at a speed exceeding a first predetermined speed, the volume of the warning sound is increased, so that it is possible to effectively prevent a person from entering the restricted area.

[0086] The explanation described a case where, when a person approaches the fence body 11 at a speed exceeding a predetermined speed, a warning sound is emitted a short time after the notification state is activated, and the volume of the warning sound is increased. However, when a person approaches the safety fence at a speed exceeding a predetermined speed, it is also possible to perform only one of the following actions: emitting a warning sound a short time after the notification state is activated, or increasing the volume of the warning sound. Alternatively, even if a person approaches the safety fence at a speed exceeding a predetermined speed, it is not necessary to emit a warning sound a short time after the notification state is activated, nor is it necessary to increase the volume of the warning sound.

[0087] Furthermore, the control device 40 is equipped with a speed detection unit that can detect an approach correlation speed which is correlated with the approach speed at which a person approaches the fence body 11, and the control device 40 is equipped with an approach correlation If it is determined that the speed is less than or equal to the second predetermined speed, the volume of the warning sound may be increased compared to the case where the proximity correlation speed is in a predetermined speed range greater than the second predetermined speed.

[0088] In this embodiment, approach correlation The predetermined speed range where the speed is greater than the second predetermined speed coincides with the speed range of V [m / s] shown in equation (2). Elderly people may not only have difficulty noticing safety fences, but may also have difficulty hearing sounds. With this configuration, approach correlation When it is determined that the speed is below the second predetermined speed, the volume of the warning sound increases. Therefore, elderly people who walk slowly are more likely to notice the warning sound, and thus it is possible to effectively deter them from entering the restricted area. The control device is designed to detect approaching correlationIn comparison to cases where the speed falls within a predetermined speed range greater than the second predetermined speed, it is not necessary to increase the volume of the warning sound.

[0089] Furthermore, the above-mentioned warning sound may also be an audio recording of a message that is effective in preventing people from entering restricted areas.

[0090] According to this configuration, a person can recognize the presence of a restricted area ahead based on the content of the sound. Therefore, it is possible to effectively deter people from entering the restricted area. In this embodiment, the case where the warning sound is an audio message that is effective in preventing people from entering the restricted area has been described. However, the warning sound does not have to be an audio message; it may be a warning sound (warning sound), such as a buzzer sound.

[0091] This disclosure is not limited to the embodiments and their variations, and various improvements and modifications are possible within the scope of the claims of this application and their equivalents.

[0092] For example, in the above embodiment, the case was described in which one light-emitting unit 12a, 12b, 12c, one sound output unit 13a, 13b, 13c, and one detection unit 14a, 14b, 14c are attached to each of the multiple wall sections 11a, 11b, 11c of the fence body 11. However, two or more light-emitting units, two or more sound output units, and two or more detection units may be attached to each of the multiple wall sections of the fence body.

[0093] Alternatively, the fence body may be fitted with only one light-emitting unit, only one sound-emitting unit, or only one detection unit. In this case, it is preferable that the single light-emitting unit, the single sound-emitting unit, and the single detection unit be fitted, for example, to a wall located in the center.

[0094] Furthermore, the case where the cable 30 for supplying power to the electrical components 12, 13, and 14 of the safety fence 10 is 2m or longer has been described. However, the cable for supplying power to the electrical components of the safety fence may be 1m or longer, or 3m or longer. Alternatively, the safety fence may not have a cable for supplying power to its electrical components and may be battery-powered.

[0095] Furthermore, the detection device can detect distance information related to the distance to a person, and the control device may gradually or continuously increase the volume of the warning sound as the distance decreases. In this way, the volume of the warning sound gradually or continuously increases as the person approaches the restricted area, effectively deterring people from entering the restricted area.

[0096] Furthermore, the detection device may be unable to detect relative position information regarding the relative position of a person with respect to the fence itself. Also, the sound output device may be unable to change the maximum output direction in which the output is loudest for the warning sound.

[0097] Furthermore, the above notification state only needs to be information based on a signal from the detection device. Specifically, the control device may determine that the above notification state is in effect when the detection device detects a person. Alternatively, the control device may determine that the above notification state is in effect when the intensity of the person detection signal, which indicates that the detection device has detected a person, is equal to or greater than a predetermined intensity. Alternatively, the control device may determine that the above notification state is in effect when the distance between the detection device and the person falls below a predetermined distance. Alternatively, the control device may determine that the above notification state is in effect when it determines, based on a signal from the detection device, that a person has entered a predetermined area.

[0098] Furthermore, safety railings may be installed at landings other than the lowest level landing. In this case, for example, power may be supplied to the electrical components by connecting the plug at the end of the power cable to an outlet at the landing station or an outlet on the elevator car.

[0099] Furthermore, the case in which the detection device 14 includes an ultrasonic sensor has been described. However, the detection device may include a LiDAR sensor instead of an ultrasonic sensor. The LiDAR sensor measures distance using one or more laser beams. The LiDAR sensor emits laser beams of a set wavelength and measures distance by receiving the return signal. When measuring distance from the emission and reception of laser beams, techniques such as triangulation, time-of-flight, or phase shift may be used.

[0100] Figure 5 is a schematic diagram illustrating the principle of triangulation. As shown in Figures 5(a), (b), and (c), laser light shone on a person and reflected from the person's surface is imaged by a photodetector (CMOS) via a light-receiving lens. When the distance to the person changes, the angle at which the reflected light is received changes, and the position where the image is formed on the photodetector changes. From this change in the image position on the photodetector, the change in distance (movement) to the person can be calculated, and the person's position can be determined. Alternatively, the detection device may be a device that detects infrared radiation. The human body emits heat. The detection device may also detect a person by sensing this heat radiation.

[0101] Furthermore, the case of installing a safety fence at the landing of elevator 1 was explained. However, safety fences may be installed for any purpose in which the aim is to prevent people from entering restricted areas. For example, safety fences may be installed to prevent people from falling onto the trusses of escalators or moving walkways. Alternatively, safety fences may be used to prevent people from entering restricted areas at construction sites. [Explanation of Symbols]

[0102] 1 Elevator, 2 Landing, 2a Floor, 4 Opening, 6 Hoistway, 7 Landing Door, 9 Building, 9a,9b Building Wall, 10 Safety Fence, 11 Fence Body, 11a First Wall, 11b Second Wall, 11c Third Wall, 12 Lighting Device, 12a First Lighting Unit, 12b Second Lighting Unit, 12c Third Lighting Unit, 13 Sound Output Device, 13a First Sound Output Unit, 13b Second Sound Output Unit, 13c Third Sound Output Unit, 14 Detection Device, 14a First Detection Unit, 14b Second Detection Unit, 14c Third Detection Unit, 15 Timer, 21a,21b,21c Column, 23a,23b,23c Speaker 24a, 24b, 24c Ultrasonic transducer, 30 Cable, 31 Winding body, 32 Handle, 35 Cable storage section, 40 Control device, 41 Control unit, 42 Memory unit.

Claims

1. A fence body positioned to stand upright relative to the mounting surface, A light-emitting device attached to the fence body, A sound output device attached to the fence body that outputs sound, A detection device attached to the fence body and capable of detecting people, A control device that, based on a signal from the detection device, determines that there is a possibility of a person entering the restricted area where the fence body is preventing human intrusion, and if it determines that the notification state has continued for a predetermined time, it outputs a warning sound from the sound output device to draw attention to the situation. A safety fence equipped with safety features.

2. The fence body is equipped with a plurality of light-emitting units attached to the fence body at intervals in a direction along the installation surface of the fence body, The detection device is capable of detecting relative position information relating to the relative position of a person with respect to the fence body. The safety fence according to claim 1, wherein the control device illuminates the proximity light-emitting unit closest to the person among the plurality of light-emitting units based on the relative position information when the notification state is in effect.

3. The detection device is capable of detecting relative position information relating to the relative position of a person with respect to the fence body. The sound output device is capable of varying the maximum output direction in which the output is loudest in the warning sound. The safety fence according to claim 1, wherein the control device changes the maximum output direction based on the relative position information so that the volume of the warning sound at the relative location increases when the notification state continues for a predetermined time.

4. The system includes a speed detection unit capable of detecting an approach correlation speed that correlates with the approach speed at which a person approaches the fence body, The safety fence according to any one of claims 1 to 3, wherein the control device determines that the proximity correlation speed is equal to or greater than a first predetermined speed, and in comparison with the case where the proximity correlation speed is in a predetermined speed range smaller than the first predetermined speed, it shortens the predetermined time and increases the volume of the warning sound.

5. The system includes a speed detection unit capable of detecting an approach correlation speed that correlates with the approach speed at which a person approaches the fence body, The safety fence according to any one of claims 1 to 3, wherein the control device determines that the approach correlation speed is less than or equal to a second predetermined speed, and increases the volume of the warning sound in comparison to the case where the approach correlation speed is in a predetermined speed range greater than the second predetermined speed.

6. The detection device is capable of detecting distance information related to the distance from a person. The safety fence according to any one of claims 1 to 3, wherein the control device increases the volume of the warning sound in stages or continuously as the distance decreases.

7. The safety fence according to any one of claims 1 to 3, wherein the warning sound is an audio recording of words that are effective in preventing people from entering the restricted area.

8. A cable for supplying power from the power source to the light-emitting device, the sound output device, and the detection device, It comprises a cable storage section for storing the aforementioned cable, The safety fence according to any one of claims 1 to 3, wherein the length of the cable is 2m or more.

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