KR101571399B1 - Folding ladder having alarm unit - Google Patents

Folding ladder having alarm unit Download PDF

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Publication number
KR101571399B1
KR101571399B1 KR1020150057994A KR20150057994A KR101571399B1 KR 101571399 B1 KR101571399 B1 KR 101571399B1 KR 1020150057994 A KR1020150057994 A KR 1020150057994A KR 20150057994 A KR20150057994 A KR 20150057994A KR 101571399 B1 KR101571399 B1 KR 101571399B1
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KR
South Korea
Prior art keywords
vertical support
disk
frames
sensor
ladder
Prior art date
Application number
KR1020150057994A
Other languages
Korean (ko)
Inventor
김종갑
정준이
강승훈
Original Assignee
진성정보기술 (주)
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Priority to KR1020150057994A priority Critical patent/KR101571399B1/en
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Publication of KR101571399B1 publication Critical patent/KR101571399B1/en

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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/003—Indicating devices, e.g. user warnings or inclinators
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/006—Devices for preventing access
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/50—Joints or other connecting parts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

The present invention relates to a folding type ladder having an alarm means, which comprises a first vertical support and a second vertical support which are rotatably connected by means of a hinge, and a first vertical support and a second vertical support interlocking with the rotation of the hinge, It can be switched off in the folded state of the support and turned on in the expanded state to provide the notification function. In particular, the present invention provides a notification function to the operator and the periphery by driving the alarm means in conjunction with the detection signals of various sensors such as an inclination angle sensor, a load sensor, and an auxiliary sensor.

Description

Folding ladder having alarm unit with alarm means < RTI ID = 0.0 >

The present invention relates to a foldable ladder, in particular to a foldable ladder equipped with an alarm means.

Typically, a ladder is used to climb a high place or to descend from a high place to a work ladder and a traffic ladder. These ladders are fixedly installed with a plurality of horizontal stiles having vertical intervals between the vertical supports at both sides. The ladder can be supported / connected between the ground and the upper layer so that it can be freely moved or moved to the upper or lower layer and various air works on the ladder.

Since the ladder is a well known technique, a detailed description thereof will be omitted. In addition, the structure of the ladder is disclosed in Korean Utility Model Registration No. 20-0412243 (Ladder) and No. 20-0397509 (Folding Ladder Device) And 20-0366815 (Ladder).

In such a ladder, when the worker is working in a place more than 1.6 meters above the height of the pedestrian, the vehicle may travel down the folding ladder, such as a pedestrian or a bicycle. In this case, the worker working on the ladder may not be aware that the pedestrian, etc. is passing under the ladder because he is engaged in the work.

If a pedestrian passes under a ladder, and an operator accidentally drops an extension or a work tool, pedestrians passing under the ladder may be injured by falling tools or the like.

Korean Utility Model Registration No. 20-0412243 Korea Utility Model Registration No. 20-0397509 Korean Utility Model Registration No. 20-0366815

It is an object of the present invention to provide a folding type ladder having an alarm means capable of recognizing the user and pedestrians in the vicinity of the two vertical supports which are foldably joined by means of the hinge portion.

In order to achieve the above object, the present invention relates to a folding type ladder having an alarm means, comprising a pair of frames, a plurality of tiers arranged between the pair of frames, and a plate- A first vertical support having a working platform;

A second vertical support having a pair of frames, a plurality of steppes arranged between the pair of frames, and a plate-shaped operation pedestal disposed between the tops of the pair of frames;

A hinge unit rotatably hinging the first vertical support and the second vertical support at a predetermined angle;

An alarm means operatively associated with the rotation of the hinge portion; And

And a power supply unit for applying power to the alarm means. In particular, the power supply unit can apply power to the alarm means only when the first vertical support member and the second vertical support member are deployed.

In the present invention, the hinge portion includes a first disk provided at the frame upper end of the first vertical support, a second disk provided at the frame upper end of the second vertical support to be hinged to the frame of the first vertical support, A switch for opening and closing the contact through the rotation of the second disk, and a hinge shaft for rotatably coupling the central axis of the first disk with the central axis of the second disk.

Here, the first disk forms a receiving groove in a flat surface that is in contact with the second disk, while the second disk forms an opening in a flat surface that is in contact with the first disk, and embeds the switch in the opening.

The switch comprises a tip portion protruding outward through an opening of the second disk, a spring portion disposed below the tip portion, and a contact pad disposed at a predetermined distance from a lower portion of the tip portion. The push- switch.

The present invention may further include at least one inclination angle sensor, and at least one inclination angle sensor may sense the horizontal state of the folding type ladder in a deployed state where the inclination angle sensors are arranged at the same height.

In addition, the present invention may further include a load sensing sensor at the lower end of the frame in contact with the ground. The load sensing sensor may sense a load condition applied to the lower end of the frame of the ladder under its deployed condition.

The present invention comprises an alarm means for performing a warning function, for example, a warning light or a speaker.

The foldable ladder according to the present invention may further include a light collecting plate on the upper surface of the operation footrest so as to be capable of storing electric energy converted by the light collecting plate even in the unfolded and / or folded state.

The present invention further includes an auxiliary sensor, which may be any one of an infrared sensor, a movement sensor, and a proximity sensor. The auxiliary sensor performs the function to easily confirm the approach of the pedestrian near the ladder.

The present invention receives a sensing signal through an inclination sensor, a load sensor, and an auxiliary sensor and drives an alarm means, that is, it can output a warning sound of a flashing light and / or a light of a warning light.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

As described above, the present invention provides a folding type ladder that can apply / interrupt power to the alarm means according to the folded state and / or the expanded state of the first vertical support and the second vertical support by means of the hinge portion .

The present invention can improve the power efficiency by electrically connecting the power supply unit and the alarm means disposed inside only in the expanded state of the folding type ladder in an electrically communicable manner.

In addition, since the present invention has a structure in which a light collecting plate is disposed and can charge itself with electric energy, it is possible to eliminate troubles such as replacement of a battery.

Further, the present invention is designed to allow the operator or the pedestrian to inform the operator or the pedestrian of the unfolding ladder in an unfolded state to inform the horizontal state of the ladder, the approach of a person in the vicinity of the ladder, and the load state applied to the ladder, .

1 is a perspective view showing a folded state of a folding type ladder according to a preferred embodiment of the present invention.
2 is a perspective view showing a developed state of a folding type ladder according to a preferred embodiment of the present invention.
3 is an exploded perspective view of a hinge portion applied to the folding type ladder of the present invention.
Fig. 4 is a sectional view of the hinge, Fig. 4 (a) is a sectional view taken along the line AA in Fig. 1, and Fig. 4 (b) is a sectional view taken along line BB in Fig.
5 is a partial cutaway view schematically showing the inside of a folding type ladder according to a preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages, features, and ways of accomplishing the same will become apparent from the following description of embodiments taken in conjunction with the accompanying drawings. In the specification, the same reference numerals denote the same or similar components throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Now, a foldable ladder with an alarm means according to the present invention will be described in detail with reference to the accompanying drawings.

The foldable ladder 1 according to the preferred embodiment of the present invention includes a first vertical support 100, a second vertical support 200 rotatably coupled to an upper end of the first vertical support 100, A hinge 300 for hingingly coupling the first vertical support 100 and the second vertical support 200 at a predetermined angle, and an alarm means 400.

The first vertical support 100 includes a pair of frames 110 spaced apart from each other by a plurality of steppes 120 and a pair of frames 110 fixed to the upper ends of the frames 110, And a work footrest (121). As shown, the horizontal deck 120 may be disposed at equal intervals between the pair of frames 110.

The operator can stand on the operation pedestal 120 of the folding type ladder developed as the A-shaped as shown in FIG.

The second vertical support 200 is hinge-connected to the upper end of the first vertical support 100 by means of the hinge 300 and includes a pair of frames (not shown) spaced apart by a plurality of steps 220, And a plate-shaped work footrest 221 fixed to an upper end of a pair of frames 210 arranged opposite to each other. Further, the ridge 220 may be disposed at equal intervals between the pair of frames 010. [

The operator will be able to work safely on the operation footrest 221 of the folding type ladder developed as the letter A as shown in Fig.

Preferably, the hinge portion 300 not only helps hinging the first vertical support 100 and the second vertical support 200 in a foldable and / or deployable manner, as described above, (400).

The hinge unit 300 includes a first disk 310 provided at the upper end of the frame 110 of the first vertical support 100 and a frame 210 of the second vertical support 200 hinged to the frame 110. [ A hinge shaft 350 rotatably coupled to a central axis of the first disk 310 and a central axis of the second disk 320 and a hinge shaft 350 coupled to the first disk 310 and the second disk 320, And a switch 330 that acts as a hinge switch through the rotation of the second disk 320. The first disk 310 may be integrally formed on the upper end of the frame 110 of the first vertical support 100 and may be fixed to the upper end of the frame 110 in an interference fit manner. Similarly, the second disk 320 may be integrally formed on the upper end of the frame 210 of the second vertical support 200, but may be fixed to the upper end of the frame 210 in an interference fit manner .

The first disc 310 forms receiving grooves 313 on one side thereof, preferably a flat surface that is in contact with the second disc 320. The second disc 320 may have an opening 323 formed on the other side of the second disc 320, preferably on a flat surface that is in contact with the first disc 310 while a switch 330 is provided in the inner space of the second disc 320 This switch 330 allows the electric wiring between the power supply unit B and the alarm means 400 to be selectively energized. In the present invention, the power supply unit B may employ various types of batteries, for example, a primary battery such as a battery or a rechargeable secondary battery.

4, the switch 330 contacts the positive electrode and the negative electrode wires W 1 and W 2 connecting the alarm means 400 and the power supply unit B to supply the power of the power supply unit B to the alarm unit And / or can be short-circuited and / That is, the switch 330 includes a tip 331 protruding from the second disk 320 with a terminal connected to the first wire W 1 and a tip 331 disposed below the tip 331, And a contact pad 333 having a spring portion 332 for facilitating movement and a terminal connected to the second electric wire W 2 and spaced apart from the lower portion of the tip portion 331 with a predetermined gap therebetween.

4 (a), the ladder 1 according to the present invention includes a first vertical support 100 and a second vertical support 200 in a folded state, The electric wire is opened and the power supply to the alarm means 400 is interrupted. That is, the switch 330 of the second disk 310 is disposed in the receiving groove 313 of the first disk 310, and the tip portion 331 of the switch 330 is inserted into the receiving groove 313 A separate external force is not applied to the tip portion 331 and the lower portion of the tip portion 331 and the contact pad 333 are separated from each other by the elastic force of the spring portion 332 to switch off, .

4 (b), the ladder 1 according to the present invention includes a first vertical support 100 and a second vertical support 200 in a deployed state, And the second electric wire are electrically connected to supply the electric power to the alarm means 400. That is, the switch 330 of the second disk 310 is detached from the receiving groove 313 of the first disk 310. When the tip portion 331 of the switch 330 is positioned on one side of the first disk 310 The lower portion of the tip portion 331 and the contact pad 333 are brought into contact with each other while the tip portion 331 is forcibly moved downward. It should be noted that switch 330 may be a push button switch embedded within the second disk, but is not limited thereto and may be replaced by various types of switches.

As described above, since one receiving groove 313 is formed in the first vertical support 100, the first vertical support 100 and / or the second vertical support 200 are rotated at a predetermined angle The first electric wire and the second electric wire can be electrically connected to each other in the non-aligned state (unfolded state) of the tip portion of the switch 330 and the receiving groove 313. As a result, the power supply is established and the warning means 400 is operated to confirm the unfolding state of the folding type ladder to the outside. The present invention can provide a notification function to the outside through the alarm means 400 only in the unfolded state, thereby minimizing unnecessary power consumption and maximizing the energy efficiency.

Here, the alarm means 400 may be a beacon or a speaker equipped with an LED light source element or the like.

The foldable ladder 1 according to the preferred embodiment of the present invention is disposed at the uppermost end of the second vertical support 200 and the operation pedestal 121 disposed at the uppermost end of the first vertical support 100 A light collecting plate P may be additionally provided on the work foot plate 221. [ In the case where the surface of the light condensing plate P, the periphery of the light condensing plate P, or the area of the light condensing plate P is divided and divided, a material for slip prevention may be applied or partially inserted.

The light collecting plate P is a module constituting member for collecting solar light. The light collecting plate P collects solar light on the light collecting plate P and converts light energy into electric energy, thereby generating electricity required for driving the alarm means 400 of the present invention. It is a facility that can do. To this end, the present invention includes a power supply unit B for directly converting sunlight into electric energy and reserving generated power.

The electrical wiring connecting the condenser plate P and the power supply unit B and the electrical connection between the switch 330 of the hinge unit 300 and the power supply unit B and the alarm unit 400 can be performed by a person skilled in the art Which are well known to those of ordinary skill in the art and are intended to exclude a clear understanding of the present invention. Since the light condensing plate P is disposed on the operation footsteps 121 and 221, a protection plate can be further stacked on the condensing plate P so as not to be damaged by the operator.

Incidentally, the present invention may be provided with one or more, preferably two or more inclination angle sensors S1. The inclination angle sensor S1 can be arranged at the same height, and is a sensor for detecting the horizontal state of the folding type ladder. When the folding type ladder is inclined with respect to the ground (horizontal plane), the inclination angle sensor S1 senses the inclination of the folding type ladder and transmits a detection signal to a control unit (not shown).

For example, when the inclination angle sensor S1 is installed at the same height of the vertical supports 100 and 200, the inclination angles of the two inclination sensors S1 are detected, If a situation occurs in which the difference exceeds a certain range, the control unit (not shown) can determine that it is a situation to be alarmed. If the inclination angle sensed by one of the inclination sensor S1 on the plane connecting the two inclination sensors S1 and perpendicular to the horizontal plane is perpendicular to the set range, the control unit (not shown) The situation can be judged.

The alarm means 400 lights / blinks the beacon or outputs sound by using a speaker so that the operator can confirm the tilting of the folding type ladder through the notification function. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention detects the horizontal state of a folding type ladder, thereby reducing the possibility of overturning the ladder, thereby helping the operator to work in a stable working environment.

The inclination angle sensor S1 may be electrically connected to the power supply unit B and the alarm unit 400, and may further include other alarm units (not shown) as needed. The alarming means 400 may provide different notification functions with different emission colors or with different blinking speeds so as to facilitate identification of the unfolding state of the folding type ladder or the identification of the horizontal sensing state as required.

The at least one inclination sensor S1 may be installed in the frames 110 and 210 as shown in the drawings, but not limited thereto, and may be installed in the footrests 121 and 221 and the steppes 120 and 220 as well.

In addition, according to the present invention, the load sensing sensors S2 can be mounted individually on the lower ends of the pair of frames 110, and the load sensing sensors S2 can be separately mounted on the lower ends of the pair of frames 210. The load sensing sensor S2 senses a load acting on the ladder and can detect a load condition acting on the lower end of the frame of the folding ladder. The load sensing sensor S2 senses the overload state and / or the load imposed on the folding ladder, and notifies the operator of the overload state and / or the load through the alarm means. As shown in the drawing, the folding type ladder according to the present invention includes the load sensing sensors S2 at the lower ends of the four frames 110 and 210. When one frame does not contact the ground, the load sensing sensors S2 The warning means may warn the dangerous state of the load of the ladder when the load detection value applied to the ladder becomes different.

Of course, the load sensing sensor S2 will also be wired with the power supply B and the alarm means.

The folding type ladder 1 according to the present invention can notify the operator of the approaching state of a pedestrian or a bicycle to the vicinity of the ladder as well as to warn the possibility of overturning of the ladder as described above. To this end, the folding type ladder 1 according to the present invention may further include an auxiliary sensor (not shown). The auxiliary sensor may be any one of an ultrasonic sensor, an infrared sensor, a movement sensor, and a proximity sensor. Of course, the present invention is in electrical communication with the control unit to transmit a sensing signal through the auxiliary sensor to the alarm unit.

While the present invention has been described in detail with reference to the specific embodiments thereof, it is to be understood that the present invention is not limited to the above-described embodiments, but the present invention is not limited thereto. It will be understood by those skilled in the art that changes and modifications may be made without departing from the scope of the present invention.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1 ----- folding type, ladder 100. 200 ----- vertical support
110, 210 ----- Frame 120, 220 ----- Stairs
121, 221 ----- operation platform 300 ----- hinge
330 ----- switch 400 ----- alarm means
S1 ----- Incline sensor S2 ----- Load sensor
W ----- Wires

Claims (10)

A pair of frames 110, a plurality of steppes 120 disposed between the pair of frames 110, and a plate-shaped work footrest 121 disposed between the upper ends of the pair of frames 110 A first vertical support 100;
A pair of frames 210, a plurality of steppes 220 disposed between the pair of frames 210, and a plate-shaped work footrest 221 disposed between the upper ends of the pair of frames 210 A second vertical support 200;
A hinge unit 300 hingedly coupled to the first vertical support 100 and the second vertical support 200 by a predetermined angle;
An alarm means (400) operatively associated with the rotation of the hinge portion (300); And
And a power supply unit (B) for applying power to the alarm unit (400)
The hinge part (300)
A first disc 310 provided at an upper end of the frame 110 of the first vertical support 100;
A second disk 320 provided at an upper end of the frame 210 of the second vertical support 200 to be hinge-coupled to the frame 110;
A switch 330 for opening and closing the contact through the rotation of the first disk 310 and the second disk 320; And
And a hinge shaft (350) rotatably coupling a central axis of the first disk (310) and a central axis of the second disk (320).
The first disc 310 has a receiving groove 313 formed in a flat surface that is in contact with the second disc 320,
The second disk 320 has an opening 323 formed in a flat surface that is in contact with the first disk 310 and the switch 330 is embedded in the opening 323.
delete delete The method according to claim 1,
The switch 330 includes a tip portion 331 protruding through the opening 323 of the second disk 320 and a spring portion 332 disposed under the tip portion 331. The tip portion 331 And a contact pad 333 disposed at a predetermined distance from the lower portion of the ladder.
The method according to claim 1,
Wherein at least one inclination angle sensor (S1) is further provided, and the at least one inclination angle sensor (S1) is arranged at the same height.
The method according to claim 1,
The pair of frames 110 and 210 are mounted on the lower ends of the frames 110 and 210, respectively.
The method according to claim 1,
The alarm means (400) is composed of a warning light or a loudspeaker.
The method according to claim 1,
The operation pedestal 121, 221 further includes a condenser P on the upper surface of the pedestal,
The power supply unit (B) is capable of storing electric energy converted by the condenser plate (P).
The method according to claim 1,
The ladder further comprises an auxiliary sensor,
Wherein the auxiliary sensor is any one of an infrared sensor, a movement sensor, and a proximity sensor.
The method according to any one of claims 5, 6, and 9,
The alarm means (400) operates in conjunction with the detection signal of the inclination angle sensor, the load detection sensor or the auxiliary sensor.
KR1020150057994A 2015-04-24 2015-04-24 Folding ladder having alarm unit KR101571399B1 (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106050124A (en) * 2016-05-30 2016-10-26 蒙物阜 Adjustment positioning mechanisms of folding ladder
CN108612468A (en) * 2018-05-04 2018-10-02 浦江概念五金科技有限公司 A kind of safe and reliable electronic double ladder
WO2019099673A1 (en) * 2017-11-15 2019-05-23 Otto Ladder Safety, Inc. Ladder having sensor and computing device for same
KR102042732B1 (en) * 2019-01-24 2019-11-27 이거송 An artificial intelligence ladder for prevention of falling.
CN111720044A (en) * 2020-06-30 2020-09-29 浙江科迅工贸有限公司 Intelligent herringbone ladder with storage function
KR102167512B1 (en) * 2020-05-13 2020-10-20 김한오 Module Type Scaffolding
CN114541957A (en) * 2022-03-10 2022-05-27 贵州电网有限责任公司 Multifunctional crawling ladder with angle measurement display and language prompt
US11499370B2 (en) 2018-05-01 2022-11-15 Otto Ladder Safety, Inc. Ladder having sensor and computing device for same
US11635307B1 (en) 2022-04-26 2023-04-25 Stress Engineering Services, Inc. Hall effect transducer assemblies and methods
KR102678347B1 (en) * 2024-02-08 2024-06-25 (주)지명건설개발 Smart ladder monitoring system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3084372B2 (en) * 1999-02-04 2000-09-04 良七 佐々木 Boat fall rescue equipment
KR200420474Y1 (en) * 2006-04-19 2006-07-04 유원빈 a ladder
KR100742175B1 (en) * 2006-06-02 2007-07-25 주식회사 우리특장 Apparatus and method for controlling linear movement of ladder for high place works car

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3084372B2 (en) * 1999-02-04 2000-09-04 良七 佐々木 Boat fall rescue equipment
KR200420474Y1 (en) * 2006-04-19 2006-07-04 유원빈 a ladder
KR100742175B1 (en) * 2006-06-02 2007-07-25 주식회사 우리특장 Apparatus and method for controlling linear movement of ladder for high place works car

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106050124A (en) * 2016-05-30 2016-10-26 蒙物阜 Adjustment positioning mechanisms of folding ladder
WO2019099673A1 (en) * 2017-11-15 2019-05-23 Otto Ladder Safety, Inc. Ladder having sensor and computing device for same
US11499370B2 (en) 2018-05-01 2022-11-15 Otto Ladder Safety, Inc. Ladder having sensor and computing device for same
CN108612468A (en) * 2018-05-04 2018-10-02 浦江概念五金科技有限公司 A kind of safe and reliable electronic double ladder
KR102042732B1 (en) * 2019-01-24 2019-11-27 이거송 An artificial intelligence ladder for prevention of falling.
WO2020153697A1 (en) * 2019-01-24 2020-07-30 이거송 Artificial intelligence ladder for fall prevention
KR102167512B1 (en) * 2020-05-13 2020-10-20 김한오 Module Type Scaffolding
CN111720044A (en) * 2020-06-30 2020-09-29 浙江科迅工贸有限公司 Intelligent herringbone ladder with storage function
CN114541957A (en) * 2022-03-10 2022-05-27 贵州电网有限责任公司 Multifunctional crawling ladder with angle measurement display and language prompt
CN114541957B (en) * 2022-03-10 2023-12-15 贵州电网有限责任公司 Multifunctional crawling ladder with angle measurement display and language prompt functions
US11635307B1 (en) 2022-04-26 2023-04-25 Stress Engineering Services, Inc. Hall effect transducer assemblies and methods
KR102678347B1 (en) * 2024-02-08 2024-06-25 (주)지명건설개발 Smart ladder monitoring system

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