Safety device for a lift

Abstract

Safety device for an elevator with an elevator car with a car door with an accelerometer for detecting the vibration of the car door, with a pre-evaluation device for determining a shaking of the car door based on the comparison of the detected vibration with at least one threshold value, with a transmission device for transmitting vibration signals based on the detected vibration to a server, and with a server for analyzing the vibration signals, wherein the pre-evaluation device is spatially connected to the elevator car, the transmission device transmits the vibration signals when the pre-evaluation device detects a shaking and the server is spatially separated from the elevator and weights the transmitted vibration signals and, depending on the weighting, stores and / or outputs the information for the probable cause of the shaking.

Description

[0001] The invention relates to a safety device for an elevator to detect vandalism towards the elevator door.

[0002] Safety devices of this type, which monitor the elevator car via camera, are known from the state of the art. This can pose legal problems.

[0003] It is an object of the invention to provide an improved safety device of the type mentioned.

[0004] This object is achieved by a safety device according to claim 1. Advantageous embodiments are specified in the further dependent claims.

[0005] The safety device according to the invention is a safety device for an elevator with an elevator car with a car door with an accelerometer for detecting the vibration of the car door, with a pre-evaluation device for determining a shaking of the car door based on the comparison of the detected vibration with at least one threshold value, with a transmission device for transmitting vibration signals based on the detected vibration to a server, and with a server for analyzing the vibration signals, wherein the pre-evaluation device is spatially connected to the elevator car, the transmission device transmits the vibration signals when the pre-evaluation device detects a shaking and the server is spatially separated from the elevator and weights the transmitted vibration signals and, depending on the weighting, stores and / or outputs the information for the probable cause of the shaking.

[0006] The security device can offer the advantage of keeping the amount of data transmitted to the server to a minimum. The security device can offer the advantage of avoiding legal issues related to data protection. The security device can offer the advantage of allowing the components of the security device in the cabin to operate with less computing power, making them more cost-effective.

[0007] The elevator can be a passenger elevator.

[0008] The acceleration sensor can be mounted on the cabin door.

[0009] Shaking is a special characteristic of the vibration detected by the accelerometer and can correspond to something like knocking or bumping against the elevator door.

[0010] Preferably, the accelerometer detects the vibration during the opening and / or closing process and / or when the cabin door is open or closed.

[0011] Preferably, the pre-evaluation device determines the shaking by the amplitude of the vibration exceeding a threshold value.

[0012] Preferably, the pre-evaluation device determines the shaking by the amplitude of the vibration periodically exceeding a threshold value.

[0013] Preferably, the pre-evaluation device determines the shaking by detecting a specific frequency, in particular the natural frequency of the door.

[0014] Preferably, the pre-evaluation device determines the shaking by performing a frequency analysis and / or a wavelet analysis.

[0015] Preferably, the pre-evaluation device determines the shaking by performing a frequency analysis with pattern recognition.

[0016] Preferably, the server weights the vibration signals by the amplitude of the vibration exceeding a threshold value.

[0017] Preferably, the server weights the vibration signals by periodically exceeding a threshold value for the amplitude of the vibration.

[0018] Preferably, the server weights the vibration signals by detecting a specific frequency, in particular the natural frequency of the door.

[0019] Preferably, the server weights the vibration signals by performing a frequency analysis and / or a wavelet analysis.

[0020] Preferably, the server weights the vibration signals by performing a frequency analysis with pattern recognition.

[0021] Further features of the invention are indicated in the drawings.

[0022] The advantages mentioned can also be realized for combinations of features in which they are not mentioned. Overview of the drawings:

[0023] Embodiments of the invention are illustrated in the drawings and explained in more detail below. Like reference numerals in the individual figures denote corresponding elements. They show: Fig. 1Flow diagram of the safety device Detailed description of the drawings:

[0024] Fig. 1 shows a flow chart of the safety device 10. The process starts at the acceleration sensor 11.

[0025] The acceleration sensor 11 measures the vibration of the cabin door when it is closed. The accelerometer transmits the measured vibration values ​​to the pre-evaluation device 12.

[0026] The pre-evaluation device 12 analyzes the received measured values ​​by comparing the amplitude of the measured values ​​with at least one threshold value. If the at least one threshold value is not exceeded, the process begins again with the acceleration sensor 11. If the at least one threshold value is exceeded, the process continues to the transmission device 13.

[0027] The transmission device 13 transmits the measured values ​​of the vibration sensor wirelessly to a server 14 using Internet protocol.

[0028] The server 14 analyses and weights the received measured values, assigns to the measured values ​​the information as to whether vandalism has occurred or not depending on the weighting, and stores this information for output to a service point. List of reference symbols:

[0029] 10Safety device flow diagram 11Accelerometer 12Pre-evaluation device 13Transmission device 14Server 15Output device

Claims

1. Safety device - for an elevator with an elevator car with a car door - with an accelerometer for detecting the vibration of the car door, - with a pre-evaluation device for determining shaking of the car door based on the comparison of the detected vibration with at least one threshold value, - with a transmission device for transmitting vibration signals based on the detected vibration to a server, and - with a server for analyzing the vibration signals characterized in that - the pre-evaluation device is spatially connected to the elevator car, - the transmission device transmits the vibration signals when - the pre-evaluation device detects shaking and - the server is spatially separated from the elevator and - weights the transmitted vibration signals and - depending on the weighting, stores and / or outputs the information for the probable cause of the shaking.

2. Safety device according to any preceding claim characterized in that - the accelerometer detects the vibration during the opening and / or closing process and / or when the cabin door is open or closed.

3. Safety device according to any preceding claim characterized in that - the pre-evaluation device determines the shaking by - the amplitude of the vibration exceeding a threshold value.

4. Safety device according to any preceding claim characterized in that - the pre-evaluation device determines the shaking by - the amplitude of the vibration periodically exceeding a threshold value.

5. Safety device according to any preceding claim characterized in that - the pre-evaluation device determines the shaking by detecting a specific frequency, in particular the natural frequency of the door.

6. Safety device according to any preceding claim characterized in that - the pre-evaluation device determines the shaking by - carrying out a frequency analysis and / or a wavelet analysis.

7. Safety device according to any preceding claim characterized in that - the pre-evaluation device determines the vibration by - carrying out a frequency analysis with pattern recognition.

8. Safety device according to any preceding claim characterized in that - the server weights the vibration signals by - the amplitude of the vibration exceeds a threshold value.

9. Safety device according to any preceding claim characterized in that - the server weights the vibration signals by - the amplitude of the vibration periodically exceeding a threshold value.

10. Safety device according to any preceding claim characterized in that- the server weights the vibration signals by detecting a specific frequency, in particular the natural frequency of the door.

11. Safety device according to any preceding claim characterized in that - the server weights the vibration signals by performing a frequency analysis and / or a wavelet analysis.

12. Safety device according to any preceding claim characterized in that - the server weights the vibration signals by performing a frequency analysis with pattern recognition.

Images