CN111977477A - Elevator using sound wave for key signal wireless transmission and non-contact button thereof - Google Patents
Elevator using sound wave for key signal wireless transmission and non-contact button thereof Download PDFInfo
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- CN111977477A CN111977477A CN202010704106.5A CN202010704106A CN111977477A CN 111977477 A CN111977477 A CN 111977477A CN 202010704106 A CN202010704106 A CN 202010704106A CN 111977477 A CN111977477 A CN 111977477A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
- B66B1/14—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. push-buttons, for indirect control of movements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3415—Control system configuration and the data transmission or communication within the control system
- B66B1/3446—Data transmission or communication within the control system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/46—Adaptations of switches or switchgear
- B66B1/461—Adaptations of switches or switchgear characterised by their shape or profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/46—Adaptations of switches or switchgear
- B66B1/50—Adaptations of switches or switchgear with operating or control mechanisms mounted in the car or cage or in the lift well or hoistway
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B2201/00—Aspects of control systems of elevators
- B66B2201/40—Details of the change of control mode
- B66B2201/46—Switches or switchgear
- B66B2201/4607—Call registering systems
- B66B2201/4638—Wherein the call is registered without making physical contact with the elevator system
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Networks & Wireless Communication (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
- Elevator Control (AREA)
Abstract
The invention discloses a non-contact button, which comprises a hollow cylinder with an opening at one end, a light emitter and a light sensation element which are oppositely arranged on the outer side surface of the cylinder, and a control circuit board with a power supply and a signal processing controller, wherein the control circuit board is provided with a power supply and a signal processing controller; the power supply is electrically connected with the light emitter and the light sensing element, and the signal processing controller is electrically connected with the light sensing element. When in use, the button function can be started only by extending the hand into the hollow column body, thereby avoiding misoperation. The invention also discloses an elevator using the non-contact button and using sound waves for key signal wireless transmission. The sound wave adopts infrasonic wave or ultrasonic wave. The elevator key can realize control operation without contacting the surface of an object, greatly reduces the possibility of cross infection after contact, maintains the health and safety of a user, solves the problem of more leads in a well of the existing elevator key by wireless transmission of key signals, can reduce the production cost and the installation cost, and prolongs the service life.
Description
Technical Field
The invention belongs to the technical field of elevators, and particularly relates to a contactless button and an elevator using the contactless button and using sound waves for key signal wireless transmission.
Background
At present, the control operation of various electrical equipment is finished by switch keys or keyboard keys, which are mechanical or touch, and when the electric equipment is used, the surface of the button is touched by hands, so that bacteria and viruses on the hands are possibly spread to the surface of the button, and the bacteria are easily infected by hands.
The equipment switch in some clean workshops or the switch keyboards used in public places, such as corridor lamp switches, elevator operation buttons, password input keyboards of banks, inquiry keyboards of libraries and the like, can be used by different people, are easy to become carriers for cross transmission of various infectious diseases, bacteria and viruses, and have higher requirement for keeping cleanness. At present, the common disinfection method for the public switch keyboard devices is to carry out manual sterilization and disinfection by special cleaning workers, so that the operation is troublesome, the efficiency is low, people cannot disinfect the public switch keyboard devices after using the public switch keyboard devices in time, and a good disinfection effect cannot be achieved.
In addition, elevators are widely used in modern buildings, the main means for people or goods transportation in high-rise buildings is an elevator, and at present, a vertically moving elevator car is provided with a plurality of floor buttons and other buttons on a control panel, and each button is connected with an elevator controller of a roof machine room through a lead wire to transmit a control signal. Under the condition of long shaft at a high floor, the required number of the lead wires is large, the length of the lead wires is long, the weight of the lead wires is increased, when an elevator controller drives a traction machine to do lifting action, larger driving force is required, and meanwhile, the lead wires are often lengthened and shortened, so that the service life is influenced. With the development of technology, in order to reduce the production cost of an elevator, simplify the installation process, and reduce failure factors, an elevator in which control signals are transmitted between an elevator control device and a car in a wireless manner without using a lead wire has been proposed.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a non-contact button and an elevator using the non-contact button and using sound waves for key signal wireless transmission, so that people can realize control operation without contacting the surface of an object, the possibility of cross infection after contact is greatly reduced, the body health and safety of a user are maintained, meanwhile, the production cost and the installation cost can be reduced by realizing wireless transmission of key signals, and the service life is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an use sound wave for button signal wireless transmission's elevator which characterized in that: the elevator control cabinet comprises four pairs of sound wave receiving and transmitting devices, wherein each pair of sound wave receiving and transmitting devices comprises a loudspeaker for sending sound waves and a microphone for receiving the sound waves, an upper moving loudspeaker arranged on the outer top surface of a lift car and an upper fixed microphone arranged on a hoistway ceiling form a first pair of sound wave receiving and transmitting devices, a lower moving loudspeaker arranged on the outer bottom surface of the lift car and a lower fixed microphone arranged on the hoistway floor form a second pair of sound wave receiving and transmitting devices, and the first pair of sound wave receiving and transmitting devices and the second pair of sound wave receiving and transmitting devices are used for wirelessly transmitting key signals of a lift car control box to an elevator control cabinet which is positioned at the top of a; the elevator control cabinet comprises a lift car control box, a lift car, a display screen, an indicator light, a sound wave transmitting and receiving device and a sound wave transmitting and receiving device, wherein the sound wave transmitting and receiving device is arranged on the lift car control box, the sound wave transmitting and receiving device is used for wirelessly transmitting control.
Preferably, the control system of the car control box comprises a signal processing controller, a coding modulator and a decoding demodulator, the keys of the car control box are connected with the input end of the signal processing controller, and the coding modulator and the decoding demodulator are both connected with the signal processing controller; the upper moving horn and the lower moving horn are connected with the output end of the code modulator; the upper mobile microphone and the lower mobile microphone are connected with the input end of the decoding demodulator; and the display screen and the indicator lamp are connected with the control end of the signal processing controller.
Preferably, the master control system of the elevator control cabinet comprises a master control processor, a coding modulator and a decoding demodulator; the upper fixed loudspeaker and the lower fixed loudspeaker are connected with the output end of the code modulator; the upper fixed microphone and the lower fixed microphone are connected with the input end of the decoding demodulator; the coding modulator and the decoding demodulator are both connected with the main control processor; and the control end of the main control processor is connected with the traction machine.
Preferably, the sound wave is infrasonic wave or ultrasonic wave, and the infrasonic wave of low power does not have the injury to the human body, and uses infrasonic wave and ultrasonic wave signal transmission can not produce electromagnetic signal interference to elevator equipment. The coding modulator sets infrasonic waves or ultrasonic waves with different frequencies for each key, and one function corresponds to one frequency, so that coding is simple.
Preferably, the keys, the display screen and the indicator lamps are arranged on a control panel of the car control box, the display screen is used for displaying pressed characters, the keys comprise keys for inputting 0-9 numbers, keys for deleting wrong input, keys for confirming input numbers, keys for opening an alarm bell and keys for opening and closing an elevator door, an indicator diagram for identifying the meanings of the keys is arranged above each key, the indicator lamps are LED lamp groups for indicating the floor pressed to be confirmed, and the numbers for identifying the corresponding floor are arranged beside each LED lamp. Only the number input after the press confirmation is used as the floor number and is input into the elevator control center through wireless transmission by the signal processing controller. And simultaneously the LED lamps beside the corresponding numbers can be lighted.
The invention also provides a non-contact button for the keys of the elevator car control box, which is characterized in that: the device comprises a hollow cylinder with an opening at one end, a light emitter and a light sensing element which are oppositely arranged on the outer side surface of the cylinder, and a control circuit board with a power supply and a signal processing controller; the light emitter is a light emitting diode or a semiconductor laser; the power supply is electrically connected with the light emitter and the light sensing element, and the signal processing controller is electrically connected with the light sensing element. When in use, the button function can be started only by extending the hand into the hollow column body, thereby avoiding misoperation.
Preferably, the opening is provided with a circle of light blocking rings to reduce the false operation of the light sensing element caused by the external light entering the cylinder.
Preferably, the contactless button can also be used for an electronic device switch, the electronic device comprises a control panel, a relay and the contactless button mounted on the control panel, the signal processing controller is electrically connected with the relay, and after the contactless button is started, a signal is output to enable the relay to operate to control the electronic device.
Compared with the prior art, the invention has the following beneficial effects: 1) the light sensation element realizes the non-contact operation of the button by using the LED lamp, the laser or the infrared ray, so that the hand of a user is prevented from directly contacting the button or the keyboard, and the chance of contacting and infecting diseases is reduced; 2) the design of finger insertion starting ensures that the elevator button cannot be triggered by mistake when people are crowded in the elevator; 3) the key signals of the lift car are wirelessly transmitted to the main control cabinet of the lift through sound waves without using lead wires for connection and transmission, so that the production cost, the installation cost and the failure rate are greatly reduced; 4) two groups of sound wave receiving and transmitting devices with the same function are respectively arranged at the upper part and the lower part of the lift car in the shaft, so that the possibility that sound wave signals cannot be received due to the fact that the shaft is too long can be reduced, and the stability of wireless transmission of key signals is ensured.
Drawings
Fig. 1 is a schematic view of the structure of an elevator according to the invention;
fig. 2 is a functional block diagram of the wireless transmission of sound waves of the elevator of the present invention;
fig. 3 is a schematic view of a car operating box control panel of the elevator of the present invention;
FIG. 4 is a schematic perspective view of a contactless button according to the present invention;
FIG. 5 is a cross-sectional view of the contactless button of the present invention after installation;
fig. 6 is a schematic diagram of the use of the contactless button of the present invention in a keyboard.
In the figure:
1-traction machine, 2-elevator control cabinet, 3 a-upper fixed loudspeaker, 3 b-upper movable microphone, 4 a-upper fixed microphone, 4 b-upper movable loudspeaker, 5-car, 5 a-car top surface, 5 b-car control box, 5 c-car bottom surface, 500-control panel, 501-display screen, 502-LED lamp set, 503-delete key, 504-confirm key, 505-alarm key, 506-numeric key, 507-on-off key, 6 a-lower movable microphone, 6 b-lower fixed loudspeaker, 7 a-lower movable loudspeaker, 7 b-lower fixed microphone, 8-hoistway, 8 a-hoistway ceiling, 8 b-hoistway floor, 9-key, 900-hollow column, 901-light emitter, 902-light blocking ring, 903-light sensing element.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description below:
the utility model provides an elevator that is used for button signal wireless transmission with sound wave, is the same with prior art, is provided with car 5 in the well, is provided with elevator control cabinet 2 in the computer lab at well 8 tops, is controlled hauler 1 by elevator control cabinet 2 and carries out the lift action through rope drive car 5.
In order to realize wireless transmission of key signals, the wireless keyboard further comprises four pairs of sound wave transceiving devices, and each pair of sound wave transceiving devices comprises a loudspeaker for sending sound waves and a microphone for receiving the sound waves.
As shown in fig. 1, an upper moving horn 4b provided on the car top surface 5a and an upper fixed microphone 4a provided on the hoistway ceiling 8a constitute a first pair of sound wave transmitting/receiving devices, a lower moving horn 7a provided on the car bottom surface 5c and a lower fixed microphone 7b provided on the hoistway floor 8b constitute a second pair of sound wave transmitting/receiving devices, and the first and second pairs of sound wave transmitting/receiving devices are used for wirelessly transmitting a key signal of the car console 5b to the elevator control cabinet 2 which controls the traction machine 1 at the top of the hoistway by sound waves.
The upper fixed loudspeaker 3a arranged on the hoistway ceiling 8a and the upper moving microphone 3b arranged on the car outer top surface 5a form a third pair of sound wave transceiving devices, the lower fixed loudspeaker 6b arranged on the hoistway floor 8b and the lower moving microphone 6a arranged on the car outer bottom surface 5c form a fourth pair of sound wave transceiving devices, and the third pair and the fourth pair of sound wave transceiving devices are used for wirelessly transmitting control signals of the elevator control cabinet 2 to the display screen and the indicator lamp to the car control box 5b through sound waves.
As shown in fig. 2, the operating system of the car operating box 5b includes a signal processing controller, a code modulator and a decoder demodulator, the keys of the car operating box 5b are connected with the input end of the signal processing controller, and the code modulator and the decoder demodulator are both connected with the signal processing controller; the upper moving horn 4b and the lower moving horn 7a are connected with the output end of the code modulator; the upper mobile microphone 3b and the lower mobile microphone 6a are connected with the input end of the decoding demodulator; the display screen and the indicator light of the car are connected with the control end of the signal processing controller.
As shown in fig. 2, the main control system of the elevator control cabinet 2 includes a main control processor, a code modulator and a decoding demodulator; the upper fixed horn 3a and the lower fixed horn 6b are connected with the output end of the code modulator; the upper fixed microphone 4a and the lower fixed microphone 7b are connected with the input end of the decoding demodulator; the coding modulator and the decoding demodulator are both connected with the main control processor; the control end of the main control processor is connected with the traction machine 1.
The operation of the elevator of the invention is as follows: when a user presses a key of a control box in the car, a data signal represented by the key is processed by the signal processing controller and the coding modulator in sequence, then a sound wave signal is sent out from the loudspeaker, sound wave signals with different frequencies can be set by different keys and sent out, a microphone received in a well receives the signal, and then the signal passes through the decoding demodulator and the main control processor in sequence, and the read data signal such as a floor signal drives a traction machine to drive the car to move to a specified position according to a preset rule. Meanwhile, the main control processor processes the control signal through the coding modulator and sends the sound wave signal out of the loudspeaker, the microphone received on the car receives the signal and then sequentially passes through the decoding demodulator and the signal processing controller, and the read control signal is sent to the display screen and the indicator lamp of the car control box, so that the display screen can correctly display the floor where the car is located and the automatic turn-off of the indicator lamp of the floor where the car has arrived.
The elevator realizes wireless signal transmission between the car keys and the elevator control cabinet, the wireless signals adopt infrasonic waves or ultrasonic signals, the infrasonic waves with low power do not harm human bodies, the upper part and the lower part of the car are simultaneously provided with the sound wave receiving and transmitting devices with the same function, namely, the connecting lines of the first pair of sound wave receiving and transmitting devices and the second pair of sound wave receiving and transmitting devices are the same, and the connecting lines of the third pair of sound wave receiving and transmitting devices and the fourth pair of sound wave receiving and transmitting devices are the same, so that the possibility that the sound wave signals cannot be received due to the fact that a hoistway is too long can.
As shown in fig. 3, it is a control panel 500 of the car console box, keys, a display screen and an indicator lamp are installed on the control panel 500 of the car console box, and the display screen 501 is used for displaying characters pressed; the keys are multiple, and comprise an alarm bell key 505 for opening an alarm bell and an opening and closing key 507 for opening and closing an elevator door besides a numeric key 506 for inputting 0-9 numbers, a delete key 503 for deleting wrong input, and a confirm key 504 for confirming input numbers; an indication graph for identifying key meanings is arranged above each key; the indicator light is an LED light group 502 used for indicating that the floor is confirmed to be pressed; and each LED lamp is provided with a number for identifying the corresponding floor beside the LED lamp.
A non-contact button, which can be used for the keys of the elevator car console, as shown in FIG. 4, comprises a hollow column 900 with one end open, a light emitter 901 and a light sensing element 903 which are oppositely arranged on the outer side surface of the column. The light emitter 901 is a light emitting diode or a semiconductor laser. The light sensing element 903 is an LED light, laser or infrared light receiver. Fig. 5 shows a state in which the contactless button is mounted on the control panel.
The contactless button also includes a control circuit board having a power supply, a signal processing controller. The power supply is electrically connected with the light emitter and the light sensing element, and the signal processing controller is electrically connected with the light sensing element. When the button is used, as shown by dotted lines in fig. 4 and 5, the button function can be started only by extending a hand into the hollow cylinder, so that misoperation is avoided.
A ring of light blocking ring 902 is arranged at the opening of the hollow cylinder 900, which can reduce the false action of external light entering the cylinder to influence the light sensing element.
When the elevator is used, a user inserts fingers into the number keys of a floor to be reached, such as the 12 th floor, the user needs to sequentially insert the fingers into two non-contact buttons of the marks 1 and 2, meanwhile, the display screen 501 displays the 12, if the input is wrong, the user deletes the finger insertion deleting key 503 and then carries out correct input, when the display screen 501 displays the correct floor, the user confirms the finger insertion confirming key 504, the 12 is used as the floor to be reached and is input into an elevator control center through wireless transmission by a signal processing controller, and meanwhile, the LED lamp beside the number 12 in the LED lamp group 502 is lightened.
In addition, the non-contact button can also be used for an electronic device switch, the electronic device comprises a control panel and a relay, the non-contact button is installed on the control panel, a signal processing controller of the control circuit board is electrically connected with the relay, and after the non-contact button is started, the signal processing controller outputs signals to enable the relay to act to control the electronic device.
As shown in fig. 6, the contactless buttons can also be used for a numeric keypad for inputting characters such as a password, and the numeric keypad includes a control panel 500, a display 501 mounted on the control panel 500 for displaying pressed characters, a plurality of contactless buttons mounted on the back of the control panel 500, and an indication diagram above each contactless button for identifying the meaning of the button; and a signal processing controller of the control circuit board is connected with the display screen.
The plurality of contactless buttons of the numeric keypad include a numeric key 502 for inputting 0 to 9 numerals, a delete key 503 for deleting erroneous input, and a confirm key 504 for confirming the input numerals. When the numeric keyboard is used, a user inserts fingers into the numeric keys needing to be input, such as '123456', the fingers are sequentially inserted into six non-contact buttons of the marks 1-6, the '123456' is displayed on the display screen 501, if the input is wrong, the fingers are inserted into the delete key 503 to be deleted and then input correctly, and when the numbers are displayed on the display screen 501, the fingers are inserted into the confirm key 504 to confirm, and the '123456' is used as the password of the cash dispenser and is input into the cash dispenser through the signal processing controller.
The above are only specific embodiments of the present invention, but the technical features are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to solve the same technical problems and achieve the same technical effects are all covered in the protection scope of the present invention.
Claims (8)
1. An elevator using sound waves for key signal wireless transmission is characterized by comprising four pairs of sound wave receiving and transmitting devices, wherein each pair of sound wave receiving and transmitting devices comprises a loudspeaker for sending sound waves and a microphone for receiving the sound waves, an upper movable loudspeaker arranged on the outer top surface of a car and an upper fixed microphone arranged on a hoistway ceiling form a first pair of sound wave receiving and transmitting devices, a lower movable loudspeaker arranged on the outer bottom surface of the car and a lower fixed microphone arranged on the hoistway floor form a second pair of sound wave receiving and transmitting devices, and the first pair of sound wave receiving and transmitting devices and the second pair of sound wave receiving and transmitting devices are used for wirelessly transmitting key signals of a car control box to an elevator control cabinet which is positioned at the top of a hoistway and used for controlling a traction machine through;
the elevator control cabinet comprises a lift car control box, a lift car, a display screen, an indicator light, a sound wave transmitting and receiving device and a sound wave transmitting and receiving device, wherein the sound wave transmitting and receiving device is arranged on the lift car control box, the sound wave transmitting and receiving device is used for wirelessly transmitting control.
2. The elevator using sound waves for key signal wireless transmission according to claim 1, wherein the operating system of the car operating box comprises a signal processing controller, a code modulator and a decoder demodulator, the keys of the car operating box are connected with the input end of the signal processing controller, and the code modulator and the decoder demodulator are both connected with the signal processing controller; the upper moving horn and the lower moving horn are connected with the output end of the code modulator; the upper mobile microphone and the lower mobile microphone are connected with the input end of the decoding demodulator; and the display screen and the indicator lamp are connected with the control end of the signal processing controller.
3. The elevator using sound waves for key signal wireless transmission according to claim 1, wherein the master control system of the elevator control cabinet comprises a master control processor, a code modulator and a decoding demodulator; the upper fixed loudspeaker and the lower fixed loudspeaker are connected with the output end of the code modulator; the upper fixed microphone and the lower fixed microphone are connected with the input end of the decoding demodulator; the coding modulator and the decoding demodulator are both connected with the main control processor; and the control end of the main control processor is connected with the traction machine.
4. The elevator using sound waves for wireless transmission of key signals according to claim 1, wherein the sound waves are infrasonic waves or ultrasonic waves.
5. The elevator using sound waves for key signal wireless transmission according to claim 1 or 2, wherein the keys, the display screen and the indicator lamps are installed on a control panel of the car console box, the display screen is used for displaying pressed characters, the keys are a plurality of keys including a key for inputting 0-9 numbers, a key for deleting wrong input, a key for confirming input numbers, a key for opening an alarm bell and a key for opening and closing an elevator door, an indicator diagram for identifying the meaning of the keys is arranged above each key, the indicator lamps are LED lamp groups for indicating the confirmation of the pressed floor, and numbers for identifying the corresponding floor are arranged beside each LED lamp.
6. A contactless button used for the key of elevator as claimed in claims 1-5, which includes a hollow cylinder with one open end, light emitter and light sensor mounted on the outer side of the cylinder, and control circuit board with power supply and signal processing controller; the light emitter is a light emitting diode or a semiconductor laser; the power supply is electrically connected with the light emitter and the light sensing element, and the signal processing controller is electrically connected with the light sensing element; when in use, the button function can be started only by extending the hand into the hollow column.
7. A contactless button according to claim 6 wherein there is a ring of stops at said opening.
8. The contactless button according to claim 6, wherein the contactless button is used for an electronic device switch, the electronic device switch comprises a control panel and a relay, the contactless button is mounted on the control panel, the signal processing controller is electrically connected to the relay, and the contactless button is activated to output a signal to operate the relay to control the electronic device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010704106.5A CN111977477A (en) | 2020-07-21 | 2020-07-21 | Elevator using sound wave for key signal wireless transmission and non-contact button thereof |
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| CN202010704106.5A CN111977477A (en) | 2020-07-21 | 2020-07-21 | Elevator using sound wave for key signal wireless transmission and non-contact button thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114604702A (en) * | 2020-12-03 | 2022-06-10 | 奥的斯电梯公司 | User input device |
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| CN107352340A (en) * | 2017-09-20 | 2017-11-17 | 王智勇 | The non-contact elevator button of infrared two-way emission type |
| CN209356059U (en) * | 2018-12-18 | 2019-09-06 | 上海工程技术大学 | A kind of base for tractor of elevator vibration monitoring device based on surface acoustic wave sensor |
| CN111039112A (en) * | 2020-03-05 | 2020-04-21 | 王新跃 | Touch-free key control device for elevator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114604702A (en) * | 2020-12-03 | 2022-06-10 | 奥的斯电梯公司 | User input device |
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