JP7350275B1 - workbench and stepladder - Google Patents

Abstract

[Problem] To provide a stepladder that detects the total weight of a worker or workers, tools, materials, etc. hanging on a workbench and stepladder, and issues an alarm when the weight exceeds a predetermined threshold set in advance. do. [Solution] The stepladder includes a plurality of legs 1, 1a that can be opened and closed and have ladder steps, a fixture 3 that can be fixed with each leg opened at a predetermined angle, and a fixture 3 that can be opened and closed to open and close each leg. The base plates 10a and 10b are provided at the center of the base plate, the weight sensor part 2b is provided at the ground contact part of each leg, and has a weight sensor 13 for detecting the weight applied to each leg; It includes a lamp LP1 that adds up the detected partial detection values to obtain a detection value, compares the detection value with a predetermined threshold value set in advance, and issues an alarm when the detection value exceeds the threshold value. [Selection diagram] Figure 1

Description

The present invention relates to a workbench and a stepladder. More specifically, it relates to a device that detects the total weight of a worker or workers, tools, materials, etc. on a workbench and stepladder, and issues an alarm when the weight exceeds a predetermined threshold value set in advance.

There are various types of work platforms on which workers work at heights, and stepladders are one of them. A stepladder is usually a two-legged ladder that can be opened and closed.The step-like legs are opened and fixed at an appropriate opening angle, and the stepladder is erected at the work location, and the worker climbs up while holding a tool and performs work at heights. It is something to do.

When working with this stepladder, accidents that could threaten the worker's life may occur, such as a worker standing too high on the stepladder and tripping, or the stepladder tilting suddenly and causing the worker to fall. There's no end to it. In order to prevent such accidents, a stepladder as disclosed in Patent Document 1, for example, has been proposed.

This conventional stepladder has a first switch that is provided on the leg opening regulating member and is opened and closed depending on whether the leg opening is good or bad, and a second switch that is provided on the bottom of the leg and that is opened and closed depending on whether the bottom of the leg is in contact with the ground or not. By opening and closing each switch, an alarm is issued when the leg opening or the grounding condition of the leg bottom is poor.

As a result, the stepladder's legs may not be opened sufficiently during work, or the stepladder may be tilted beyond its limit at the work location, resulting in accidents such as falls of workers who are working on the stepladder. It is possible to prevent this from happening.

Utility Model Publication No. 1-105141

The conventional stepladder described above is useful in that danger to the worker can be avoided using the degree of opening of the legs and the grounding state of the bottom of the legs as indicators. However, there were also the following issues. That is, although accidents caused by defects in the opening of the legs or the grounding condition of the bottoms of the legs are caused by such defects, there are also factors that cause the defects in the first place.

It can be easily assumed that one of the factors is the total weight applied to the stepladder. In fact, it goes without saying that the total weight greatly affects the safety or risk of work. In other words, not only when the worker's weight is too heavy, but also when the worker lifts tools and materials, or when they are handed to him by a worker below, the total weight of the worker plus the tools and materials. If the weight is too heavy, the stepladder tends to become unstable, which is dangerous.

The present invention was devised in view of the above points, and detects the total weight of the worker or workers hanging on the workbench and stepladder, tools, materials, etc. The purpose of the present invention is to provide a work platform and a stepladder that issue an alarm when a threshold is exceeded.

[1] In order to achieve the above object, the present invention includes a base, a detection unit having a weight sensor that detects the weight applied to the entire base, and a detection value of the weight sensor and a predetermined value set in advance. The workbench is equipped with an alarm unit that compares threshold values and issues an alarm when the detected value exceeds the threshold value.

By including the platform, the workbench of the present invention can support the weight of a worker standing on the platform or the weight of a worker carrying tools or materials. Further, by providing a detection section having a weight sensor that detects the weight applied to the entire platform, the detected value indicated by the weight sensor becomes the total weight, and the detected value can be used.

First, by providing a notification unit that compares the detected value of the weight sensor with a predetermined threshold set in advance and issues an alarm when the detected value exceeds the threshold, the detected value of the weight sensor and By comparing preset thresholds, it is possible to determine whether the detected value is within a safe range that does not exceed the threshold, or whether it is within a dangerous range that exceeds the threshold. .

In addition, an alarm is issued when the detected value exceeds a threshold, so this alarm notifies the worker on the workbench or other workers assisting the worker of the danger of the work. be able to. This makes it possible to prompt, for example, to change workers or change the tools and materials used.

[2] In the workbench according to the present invention, a plurality of sub-thresholds are set in stages depending on the rate of reaching the threshold, and the detected value is set at any one of the sub-thresholds. It may also be configured such that each time the sub-threshold is exceeded, an alarm corresponding to the nearest sub-threshold exceeded by the detected value is issued.

By setting multiple sub-thresholds in stages in the alarm unit depending on the rate of reaching the threshold, each sub-threshold can be used to determine the level of danger until the threshold is reached. can be set in stages.

In addition, each time the detected value exceeds one of the sub-thresholds, an alarm corresponding to the nearest sub-threshold exceeded by the detected value will be issued, allowing you to detect the most dangerous condition at present. Since each worker can be notified by an alarm corresponding to a high sub-threshold value, strong caution can be urged.

[3] In the workbench according to the present invention, the platform has a plurality of legs, the weight sensor is provided on each of the legs, and the partial detection values detected by the weight sensors are summed up. It is also possible to adopt a configuration in which weight is used as the detected value.

The workbench has a plurality of legs, and a weight sensor is installed on each leg, and the detected value is the sum of the partial detection values detected by each weight sensor. By placing the detection part of the weight sensor on the ground surface and detecting the weight, the total weight applied to the workbench can be accurately measured and used as a detected value.

[4] In the workbench according to the present invention, the workbench is of an assembly type, and a lighting section is provided at a predetermined location of the workbench, and the lighting section is turned off before assembling the workbench. Alternatively, the light may be turned on when the workbench is assembled into a workable shape.

Since the workbench is an assembly type, when it is used, it can be made into a shape and size that are necessary and sufficient for the work, and when it is not used, it can be made into a shape and size suitable for storage, for example.

A lighting section is provided at a predetermined location on the workbench, and the lighting section is turned off before the workbench is assembled, and turns on when the workbench is assembled into a shape that allows work, so for example, in a dark place. When the workbench is assembled, the presence of the workbench becomes obvious from the surroundings by the lighting of the lighting section, which reduces the risk of contact or collision between workers and the like.

Note that "assembled type" includes both those that are originally integrated and assembled into a usable shape by deforming them, and those that are originally separate parts that are combined and assembled into a usable shape. .

[5] The workbench according to the present invention includes a brightness sensor, and when the brightness sensor detects that the brightness of the space in use is equal to or higher than a predetermined brightness, the workbench that is turned off does not turn on. or, when the lighting section that is turned on is turned off, and the brightness sensor detects that the brightness of the used space is less than a predetermined brightness, the lighting section that is turned off is turned on, or the lighting section that is turned off is turned on. It is also possible to maintain the lighting state of the lighting section, and to adjust the brightness of the lighting section as appropriate according to the brightness of the space in use.

Since the workbench has a brightness sensor, it is possible to measure the brightness of the space in use. When the brightness sensor detects that the brightness of the space being used is higher than a predetermined brightness, it does not turn on the lighting parts that are off or turns off the lighting parts that are on, so for example during the daytime. If so, the lighting section will not turn on, and if you go from a dark place to a bright place, the lighting section that was on will turn off.

Furthermore, when the brightness sensor detects that the brightness of the space being used is less than a predetermined brightness and the workbench is assembled into a shape that allows work, the lighting section that is turned off is turned on. Alternatively, when the workbench is assembled into a workable shape and the lighting section is already lit, the lighting state of the lighting section is maintained.

As a result, when the workbench is assembled into a workable shape and the brightness sensor detects that the brightness of the space being used is less than a predetermined brightness, the lighting section is always turned on. Furthermore, the brightness of the lighting section that is lit can be adjusted appropriately to match the brightness of the space in which it is used, so that the lighting section that is lit can be used as a sign that the workbench is in operation, and the surrounding area can be used as a sign that the workbench is in operation. The lighting can be illuminated with sufficient brightness.

[6] In order to achieve the above object, the present invention provides a plurality of legs that can be opened and closed and have ladder steps, a fixture that can fix each of the legs in a state opened at a predetermined angle, and a base plate provided at the center of the opening/closing movement of each leg; a detection unit provided at the ground contact portion of each leg and having a weight sensor for detecting the weight applied to each leg; An alarm unit that adds up the partial detection values detected by the sensors to obtain a detection value, compares the detection value with a predetermined threshold value set in advance, and issues an alarm when the detection value exceeds the threshold value. It is a stepladder equipped with.

The stepladder of the present invention is equipped with a plurality of legs that can be opened and closed and have ladder steps, so that the legs can be opened and closed so that they can be used for work, and the worker can stand on a ground surface. can climb up. Furthermore, the legs that are opened at a usable angle can be fixed with fixtures, so the stepladder can be maintained in a usable state.

Furthermore, the base plate provided at the center of the opening/closing movement of each leg is located at the highest point when the legs are opened and erected. It can also be used as a foot rest for standing on the highest point, or as a seat for taking a break during work.

The weight sensor of the detection unit is provided at the ground contact part of each leg and detects the weight applied to each leg. In addition, since the detected value is the weight that is the sum of the partial detection values detected by each weight sensor, by placing the detection part of the weight sensor on each leg on the ground surface and detecting the weight, the total weight applied to the workbench is determined. can be accurately measured and used as a detected value.

The detection value of the weight sensor is first compared with a predetermined threshold value set in advance, and includes an alarm unit that issues an alarm when the detected value exceeds the threshold value. Compare the detected value with a predetermined threshold and determine whether the detected value is within a safe range that does not exceed the threshold, or whether the detected value is within a dangerous range that exceeds the threshold. I can do it.

In addition, an alarm is issued when the detected value exceeds a threshold, so this alarm notifies the worker on the workbench or other workers assisting the worker of the danger of the work. be able to. This makes it possible to prompt, for example, to change workers or change the tools and materials used.

The present invention provides a work platform that detects the total weight of the worker or the worker, tools, materials, etc. hanging on the work platform and stepladder, and issues an alarm when the weight exceeds a predetermined threshold set in advance. and a stepladder can be provided.

1 is a perspective view showing the structure of a first embodiment of a stepladder according to the present invention. 2 is a circuit diagram showing the structure of a control system of the stepladder shown in FIG. 1. FIG. FIG. 3 is an explanatory diagram of a brightness detection section and a weight detection section in the circuit diagram of FIG. 2; It is a circuit diagram showing the structure of a control system showing a second embodiment of the stepladder according to the present invention. FIG. 5 is an explanatory diagram of a brightness detection section and a weight detection section in the circuit diagram of FIG. 4. FIG.

Embodiments of the present invention will be described in further detail with reference to FIGS. 1 to 5.
As shown in FIG. 1, a stepladder A1, which is a workbench according to the first embodiment of the present invention, has two legs 1 and 1a each having a predetermined length and having a step-like shape. The legs 1 and 1a are rotatably supported by a central shaft 2 at two locations on both sides of one end (upper end in FIG. 1) in the length direction.

The legs 1 and 1a each have leg members 11 and 12 and leg members 11a and 12a connected by a predetermined number of step members 10 so as to be slightly spread out from the parallel state toward the other end in the length direction. are doing. In this embodiment, the step members 10 are provided in five steps on each of the leg portions 1 and 1a. Note that the two step members 10a and 10b at the top in FIG. 1 are horizontal to each other in a set state, which will be described later, and have the functionality of serving as a work base plate.

Weight sensors 13 are provided at the lower ends of the leg members 11, 12 and the leg members 11a, 12a in FIG. 1, respectively. By grounding each weight sensor 13 when in use, it is possible to measure the total weight applied to each weight sensor 13. Then, the sum of the weights (partial detection values) applied to each of the weight sensors 13 becomes the total weight applied to the stepladder A1. This total weight may be a value that includes the weight of the stepladder A1, or may be a value that is not added as a tare.

In addition, lamps LP1 of a predetermined length, which are illumination parts, are provided on the side surfaces of a total of ten step members 10. As shown in FIG. 1, each lamp LP1 is provided a little apart from the top surface of each step member 10, and is not easily affected by the treading force or weight of a worker stepping on each step member 10 when going up and down. That's what I do.

The lamp LP1 of this embodiment is a so-called multi-color LED, and can emit light in four colors, red, pink, yellow, and blue, and can be switched by a signal from the communication section 7, which will be described later. Further, each lamp LP1 emits light of the same color in synchronization, and the timing at which the color changes is also synchronized.

The brightness of the lamp LP1 (as well as the lamp LP2 described later) can be adjusted automatically or manually to match the brightness of the space in which it is used. In other words, if the brightness of the space used is darker, the brightness of the lamp LP1 will be reduced to a visible level, and if it is brighter, the lamp LP1 will also be brightened to a visible level, and so on. The specifications can be adjusted in stages.

The legs 1 and 1a can be fixed by the fixture 3 when opened at a predetermined angle shown in FIG. 1 about the central axis 2. The fixture 3 also functions as a switch lever for the main switch SW1 built into the upper part of the leg member 12a in FIG. When the fixture 3 rotates to the angle shown in FIG. 1 with respect to the main switch SW1, the main switch SW1 is turned on, and when it rotates downward from that angle and deviates by a certain amount, the main switch SW1 is turned off. Note that the means for turning on the main switch SW1 is not limited to the fixture 3 described above, and other known means such as a general manual switch that is not particularly related to the opening degree of the legs 1 and 1a may be employed. You can also.

That is, the legs 1 and 1a are opened at a predetermined angle shown in FIG. By replacing the engagement pin 15 provided on the upper part of the leg member 12, the main switch SW1 is turned on, and by replacing the engagement portion 30 of the fixture 3 with the engagement pin 15a again, the main switch SW1 is turned on. becomes OFF.

Next, the structure of the stepladder A1 will be explained in relation to the circuit diagrams of the control system shown in FIGS. 2 and 3. Note that FIG. 2 shows the overall structure of the control system of the stepladder A1, and the control system has two circuits, a circuit R1 and a circuit R2, which are closed circuits during operation.

The circuit R1 is a circuit of battery BT→main switch SW1→luminance sensor section Sa→lamp switch SW2→lamp LP1→weight sensor section Sb→battery BT.
Further, the circuit R2 is a circuit of battery BT→main switch SW1→luminance sensor section Sa→weight sensor section Sb→battery BT.

As shown in FIG. 3(a), the brightness sensor part Sa is connected to the main switch SW1 and a brightness sensor 4 that senses the surrounding brightness, and is connected to the brightness sensor 4, and further connected to the lamp switch SW2 and the weight sensor part Sb. It has a determination section 5.

The determination unit 5 compares and determines the brightness (cd/m ² ) sensed by the brightness sensor 4 with a preset brightness threshold, and if it is dark, turns on the lamp switch SW2 to enable electricity to be supplied to the lamp LP1. do. In addition, when it is bright, the lamp switch SW2 is turned off to enable direct electricity to be applied to the weight sensor section Sb.

The weight sensor section Sb, which is a detection section, has four weight sensors 13 connected in parallel to the lamp LP1, which is an illumination section and an alarm section, and the determination section 5 of the brightness sensor section Sa, as shown in FIG. 3(b). , a determining section 6 connected to each weight sensor 13, and a communication section 7 connected to the determining section 6 and further connected to the battery BT. Note that the notification unit is not limited to a lamp or a buzzer, and may employ other known means as long as it can notify the surroundings of the determination result.

Note that the determination unit 6 notifies the communication unit 7 of the determination result, and the communication unit 7 transmits a signal based on the result. That is, the total weight (detection value) obtained by adding up the detection values (partial detection values) of the weight sensor 13 is compared with a preset threshold value.

If the total weight is lighter than the threshold value, a signal is sent wirelessly from the communication unit 7 to the lamp LP1 based on one of a plurality of preset sub-threshold values, and the detected value is exceeded. It emits light in a color that corresponds to the sub-threshold closest to the sub-threshold to alert workers and others to how close the total weight is to the threshold.

Additionally, if the total weight is heavier than the threshold, a signal is sent wirelessly from the communication unit 7 to the lamp LP1, which causes the lamp to emit light in a color corresponding to the case where the total weight exceeds the threshold. Notify the user that the value has been exceeded and urge the user to immediately get off the stepladder A1.

Note that when the circuit R2 becomes a closed circuit, a signal is sent from the determination unit 6 to the lamp switch SW2, and the lamp LP1 can be energized. As a result, the lamp LP1 is turned on even if it was not initially turned on due to the lamp switch SW2 being OFF, and the lamp LP1 is turned on by the signal from the communication section 7, and the lamp LP1 is turned on by the signal from the communication section 7, and the lamp LP1 is turned on by the color corresponding to the threshold value or the nearest lamp whose detected value exceeds the lamp switch SW2. It can emit light in a color that corresponds to the threshold value.

(effect)
Next, with reference to FIGS. 1 to 3, the usage and operation of the stepladder A1 will be explained.
(1) Open the legs 1 and 1a of the stepladder A1 to an appropriate angle, hook the fixture 3 onto the engagement pin 15, and turn on the main switch SW1. Thereby, the brightness sensor section Sa can be energized.

(2) The surrounding luminance (brightness) sensed by the luminance sensor 4 of the luminance sensor section Sa is compared and determined by the determination section 5 with a preset threshold value. When the brightness is lower than the threshold value, the lamp switch SW2 is turned on by a signal from the determination unit 5, and the lamp LP1, the weight sensor Sb, and the battery BT can be energized. As a result, the circuit R1 becomes a closed circuit, the lamp LP1 lights up in blue, and the weight sensor Sb also becomes operable.

In this way, the stepladder A1 is assembled into a workable shape, and when the brightness sensor 4 detects that the brightness of the space in use is less than a predetermined brightness, the lamp LP1 is always turned on. In addition, the brightness of the lamp LP1 can be adjusted appropriately according to the brightness of the space in which it is used, so the brightness of the lamp LP1 can be used as a sign that the stepladder A1 is in operation, or to provide the necessary and sufficient brightness to the surrounding area. It can be used as illumination.

(3) Then, when the stepladder A1 is placed on the ground where the work is to be performed, the four weight sensors 13 on the legs are in contact with the ground, the partial detection values are added up, and the detected value is the weight of the stepladder A1. Therefore, it indicates 0 kg. Here, for example, when a worker weighing 88 kg gets on the stepladder A1, the detected value obtained by adding up the partial detected values of each weight sensor 13 indicates 88 kg. Additionally, if the worker is carrying tools, materials, etc., the total weight including those tools is detected.

(4) In this embodiment, the preset threshold is 100 kg, the first sub-threshold is 95 kg, the second sub-threshold is 90 kg, and the weight of the worker is as described above. Assuming that the worker's weight is 88 kg, the worker's weight does not exceed the threshold, and the difference is 12 kg, which is a sufficient distance (light).

As a result, the color of the lit lamp LP1 remains blue and does not change due to the signal from the communication unit 7 that has been notified of the determination result by the determination unit 6, allowing the worker etc. to continue working. I can let you know. Note that the set value and number of sub-thresholds are not limited to the above, and can be set as appropriate.

(5) Furthermore, if the weight of the worker is, for example, 92 kg, the color of the lamp LP1 will be the color (yellow) corresponding to the nearest sub-threshold value of 90 kg that the detected value (total weight) exceeds; Informs you that you are somewhat close to the threshold. In addition, if the worker's weight is, for example, 98 kg, the color of lamp LP1 will be the color (pink) corresponding to the nearest sub-threshold value of 95 kg that the detected value (total weight) exceeds, and the threshold It can alert you to the fact that the value is quite close.

(6) Furthermore, if the worker's weight is 105 kg, it exceeds the threshold value, so the color of lamp LP1 changes to the color (red) corresponding to the threshold value, and the worker, etc. It is possible to notify the operator that the threshold value has been exceeded and prompt the worker to immediately get off the stepladder A1.

(7) Furthermore, when the surrounding brightness (brightness) is brighter than a preset threshold value, the lamp switch SW2 is turned off by the signal from the determination unit 5, and the weight sensor Sb and battery BT can be energized. Since the circuit R2 becomes a closed circuit, the weight sensor Sb is activated.

The action of the weight sensor Sb at this time is almost the same as the actions (3) to (6) of the weight sensor Sb described above, but when the circuit R2 becomes a closed circuit, the determination unit 6 of the weight sensor Sb At the same time as notifying the communication unit 7 of the determination result, a signal is sent to the lamp switch SW2 and turned ON to temporarily light the lamp LP1, making it possible to display the determination result by lighting color. Then, after informing the operator etc. of whether the total weight exceeds the threshold value by the lighting color of the lamp LP1, the lamp LP1 is turned off.

In this way, the stepladder A1 detects the total weight of the worker (or the worker and tools, materials, etc.) hanging on the stepladder A1, and when the weight exceeds a predetermined threshold set in advance, the light is turned on. It is possible to issue a warning depending on the color of LP1, and it is possible to provide a stepladder that can prevent accidents such as falls of workers.

Note that the weight sensor Sb also operates when the circuit R2 becomes a closed circuit, that is, when the lamp LP1 is not lit. Further, when the lamp LP1 is lit as described above, the presence of the stepladder A1 can be notified to the surroundings even in a dark place, and accidents such as collisions between workers can be prevented.

FIG. 4 shows the overall structure of the control system of stepladder A2, which is a workbench according to the second embodiment of the present invention, and the control system has two circuits, circuit R3 and circuit R4, which are closed circuits during operation. ing.

The circuit R3 is a circuit of battery BT→main switch SW1→luminance sensor section Sa→lamp switch SW2→lamp LP2→weight sensor section Sc→buzzer BZ→battery BT.
The circuit R4 is a circuit of battery BT→main switch SW1→luminance sensor section Sa→weight sensor section Sc→buzzer BZ→battery BT.

The brightness sensor portion Sa is the same as that of the stepladder A1, as shown in FIG. 5(a), and therefore the description thereof will be omitted.

As shown in FIG. 5B, the weight sensor section Sc, which is a detection section, includes four weight sensors 13 connected in parallel to the lamp LP2, which is an illumination section, and the determination section 5 of the brightness sensor section Sa, and each weight sensor 13. It further has a determination section 8 connected to a buzzer BZ which is a notification section.

The determination unit 8 notifies the buzzer BZ of the determination result, and the buzzer BZ outputs a sound by changing the sound quality or volume based on the result. That is, the total weight (detection value) obtained by adding up the detection values (partial detection values) of the weight sensor 13 is compared with a preset threshold value.

If the total weight is lighter than the threshold value, the buzzer BZ will set the predetermined value corresponding to the sub-threshold nearest to which the detected value exceeds among the plurality of pre-set sub-threshold values. A sound (for example, an intermittent sound such as a buzzing sound) is emitted to alert the operator to how close the weight is to the threshold value, but the sound is not made if the weight is sufficiently light from the threshold value.

Additionally, if the total weight is heavier than the threshold, the buzzer BZ will emit a sound corresponding to the case where the threshold is exceeded (for example, a loud continuous sound such as a beep) to notify the operator, etc. of the total weight. It notifies the user that the threshold has been exceeded and prompts the user to immediately get off the stepladder A2.

(effect)
Next, with reference to FIGS. 4 and 5, the usage and operation of the stepladder A2 will be explained.
(1) Open the legs (not shown) of the stepladder A2 to an appropriate angle, hook the fixture onto the engagement pin, and turn on the main switch SW1. Thereby, the brightness sensor section Sa can be energized.

(2) The surrounding luminance (brightness) sensed by the luminance sensor 4 of the luminance sensor section Sa is compared and determined by the determination section 5 with a preset threshold value. When the brightness is lower than the threshold value, the lamp switch SW2 is turned on by a signal from the determination unit 5, and the lamp LP2, weight sensor Sc, buzzer BZ, and battery BT can be energized. As a result, the circuit R3 becomes a closed circuit, the lamp LP2 lights up, and the weight sensor Sc and the buzzer BZ become operable.

In this way, the stepladder A2 is assembled into a workable shape, and when the brightness sensor 4 detects that the brightness of the space in use is less than a predetermined brightness, the lamp LP2 is always lit. The brightness of the lamp LP2 can be adjusted as appropriate to match the brightness of the space in which it is used, so the brightness of the lamp LP2 can be used as a sign that the stepladder A2 is in operation, or to provide the necessary and sufficient brightness to the surrounding area. The illumination that can be used is the same as that for the stepladder A1 described above.

(3) Then, when the stepladder A2 is placed on the ground where the work is to be done, the four weight sensors 13 on the legs are in contact with the ground, the partial detection values are added up, and the detection value is the tare weight of the stepladder A2. Therefore, it indicates 0 kg. Here, for example, when a worker weighing 88 kg stands on the stepladder A2, the detected value obtained by adding up the partial detected values of each weight sensor 13 indicates 88 kg. Additionally, if the worker is carrying tools, materials, etc., the total weight including those tools is detected.

(4) In this embodiment, the preset threshold is 100 kg, the first sub-threshold is 95 kg, the second sub-threshold is 90 kg, and the weight of the worker is as described above. Assuming that the weight of the worker is 88 kg, the worker's weight does not exceed the threshold value, and the difference of 12 kg is sufficiently light, so the buzzer BZ does not sound and the worker is notified that it is possible to continue the work.

(5) If the worker's weight is, for example, 92 kg, a sound (boo-boo-boo: slow intermittent sound) corresponding to the nearest sub-threshold value of 90 kg exceeded by the detected value (total weight) will sound. Indicates that it is somewhat close to the threshold. In addition, if the worker's weight is, for example, 98 kg, a sound (buzzing: strong and fast intermittent sound) corresponding to the nearest sub-threshold value of 95 kg among those exceeded by the detected value (total weight) will sound, and the threshold value will be exceeded. It can warn you that something is very close.

(6) In addition, if the worker's weight is 105 kg, the threshold is exceeded, so a sound corresponding to the threshold (boo: strong continuous sound) is emitted, reminding the worker of the total weight. It is possible to inform the user that the threshold has been exceeded and prompt the user to immediately get off stepladder A2.

(7) Furthermore, when the surrounding luminance (brightness) is brighter than a preset threshold value, the lamp switch SW2 is turned off by a signal from the determination section 5, and the weight sensor Sc is energized. The actions of the weight sensor Sc at this time are similar to the actions (3) to (6) of the weight sensor Sc described above, so the explanation will be omitted.

In this way, the stepladder A2 detects the total weight of the worker (or the worker and tools, materials, etc.) hanging on the stepladder A2, and sounds a buzzer when the weight exceeds a predetermined threshold. It is possible to provide a stepladder that can issue an alarm with the sound of the BZ and can prevent accidents such as falls of workers.

Furthermore, even when the circuit R4 becomes a closed circuit, that is, when the lamp LP2 is not lit, the weight sensor Sc and the buzzer BZ operate. Further, when the lamp LP2 is lit as described above, the presence of the stepladder A2 can be notified to the surroundings even in a dark place, and accidents such as collisions between workers can be prevented.

In addition, in the workbench such as a stepladder of the present invention, even if a large load is momentarily detected, such as when a worker steps on the step member 10 with force, it is possible to immediately add up the load and use it as a detected value. By applying control to prevent this from occurring, it is also possible to detect the impact and use the summed value after the load has calmed down after a predetermined period of time as the detected value.

The terms and expressions used in this specification and claims are for descriptive purposes only and are not intended to be limiting in any way. There is no intention to exclude terms or expressions that are equivalent to some of them. Further, it goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

A1 Stepladder 1, 1a Leg 10 Step members 11, 12 Leg members 11a, 12a Leg members 10a, 10b Step member 13 Weight sensor 15 Engagement pin 15a Engagement pin LP1 Lamp 2 Central shaft 3 Fixture 30 Engagement part SW1 Main Switch R1 Circuit R2 Circuit BT Battery Sa Brightness sensor section SW2 Lamp switch Sb Weight sensor section 4 Brightness sensor 5 Judgment section 6 Judgment section 7 Communication section A2 Stepladder R3 Circuit R4 Circuit LP2 Lamp BZ Buzzer Sc Weight sensor section 8 Judgment section

Claims (6)

The base and
A lighting section,
Has a brightness sensor,
When the brightness sensor detects that the brightness of the used space is equal to or higher than a predetermined brightness, the brightness sensor does not turn on the lighting section that is off, or turns off the lighting section that is on, and detects that the brightness of the used space is less than a predetermined brightness, turns on the lighting section that is off, or maintains the lighting state of the lighting section that is lit, and the lighting section A workbench whose brightness can be adjusted as appropriate to suit the brightness of the space in which it is used. a detection unit having a weight sensor that detects the weight applied to the entire platform;
The workbench according to claim 1, further comprising a notification unit that compares the detected value of the weight sensor with a predetermined threshold value set in advance and issues an alarm when the detected value exceeds the threshold value. A plurality of sub-thresholds are set in stages based on the difference in the rate of reaching the threshold, and each time the detection value exceeds one of the sub-thresholds, the detection 3. The workbench according to claim 2, wherein an alarm is generated corresponding to the nearest sub-threshold value exceeded. The platform has a plurality of legs, and the weight sensor is provided on each of the legs, and the detected value is a weight that is a sum of partial detection values detected by each of the weight sensors. The workbench described in 3 . a plurality of legs that can be opened and closed and have ladder steps;
a fixture capable of fixing each leg in a state opened at a predetermined angle;
a base plate provided at the center of the opening/closing movement of each leg;
A lighting section,
Equipped with a brightness sensor,
When the brightness sensor detects that the brightness of the used space is equal to or higher than a predetermined brightness, the brightness sensor does not turn on the lighting section that is off, or turns off the lighting section that is on, and detects that the brightness of the used space is less than a predetermined brightness, turns on the lighting section that is off, or maintains the lighting state of the lighting section that is lit, and the lighting section A stepladder whose brightness can be adjusted to suit the brightness of the space in which it is used. a detection unit that includes a weight sensor that is provided at a ground contact portion of each of the legs and that detects the weight applied to each of the legs;
The partial detection values detected by each of the weight sensors are added together to form a detection value, the detection value is compared with a predetermined threshold value set in advance, and an alarm is issued when the detection value exceeds the threshold value. The stepladder according to claim 5, further comprising a notification section that emits a notification.

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