Safety device for a passenger lift

Abstract

Safety device for a passenger lift with a lift car with a car door with a presence determination device for determining the presence of at least one person in the lift car with a stop state determination device for determining the stop state of the lift car with a door state determination device for determining the closed state and the duration of the closed state of the car door of the lift car, and with a transmission device for transmitting a signal to a supervisory authority.The transmission device is designed to transmit the signal when the door state determination device determines the closed state for the car door and the presence determination device determines at least one person in the elevator car and the stop state determination device determines the stop state of the elevator car and a certain period of time has elapsed since which the stop state determination device has continuously determined the stop state of the elevator car and the door state determination device has continuously determined the closed state of the car door.

Description

[0001] The invention relates to a safety device for passenger lifts in the event of persons being accidentally trapped in the lift car.

[0002] Safety devices of the type mentioned are known from the prior art, which provide an alarm button in the elevator car in the event of unintentional locking of persons in the elevator car.

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

[0004] This object is achieved, starting from a safety device of the type mentioned above, 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 a passenger elevator with an elevator car with a car door with a presence determination device for determining the presence of at least one person in the elevator car with a stop state determination device for determining the stop state of the elevator car with a door state determination device for determining the closed state and the duration of the closed state of the car door of the elevator car, and with a transmission device for transmitting a signal to a supervisory authority.The transmission device is designed to transmit the signal when the door state determination device determines the closed state for the car door and the presence determination device determines at least one person in the elevator car and the stop state determination device determines the stop state of the elevator car and a certain period of time has elapsed since which the stop state determination device has continuously determined the stop state of the elevator car and the door state determination device has continuously determined the closed state of the car door.

[0006] The security device may have the advantage of increasing passenger safety and / or providing automated alarms and / or preventing misuse, thereby saving costs.

[0007] The presence determination device, the stop state determination device, and / or the door state determination device can be designed to send a signal with the result of their determinations to the transmission device.

[0008] Determination can be a measurement, or detection, or a signal state, or the reception of a corresponding signal.

[0009] The presence detection device can be a 2D or 3D camera in the elevator car that monitors the space within the elevator car and has image recognition to identify people and the number of people inside. The presence detection device can be a 2D or 3D camera that monitors the entrance to the elevator car and identifies people and their direction of movement into or out of the elevator car. The presence detection device can be a system that uses an accelerometer to detect the horizontal movement of the car when a person enters or exits the elevator car and calculates the number of people in the elevator car from the number of entries and exits.The presence detection device may be a system of two light barriers positioned one behind the other in the passage of the elevator car entrance, which detects the direction of movement of a person entering or exiting the elevator car by means of the time offset of the detection, and which determines the number of people in the elevator car from the count of the entry or exit.

[0010] The stop state determination device can be an absolute position determination system that detects the position of the elevator car and uses this to determine the speed or stop state. The stop state determination device can be the general control device for the elevator's travel movement, which can command the stop state. The stop state determination device can be a holding brake, which enforces the stop state of the elevator car through its status. The stop state determination device can be an acceleration sensor on the elevator car that detects the movement state of the elevator car.

[0011] The door state determining device may comprise a contact switch on the elevator car for detecting the closed state. The door state determining device may be the general control device for the elevator's travel movement, which can instruct the door state.

[0012] The transmission device may be a wired or wireless transmission device.

[0013] The supervisory authority may be a service company for continuous monitoring of the elevator.

[0014] Preferably, the safety device comprises a knock detection device for detecting knocking at the cabin door. Preferably, the transmission device is configured to transmit the signal when a knock is detected by the device for detecting mechanical or acoustic vibrations during the specified period of time.

[0015] This can have the advantage of further increasing the reliability of the safety device by linking automatic and manual elements that check each other.

[0016] The knock detection device preferably comprises a vibration sensor for detecting the vibration or a microphone for detecting the noise of the cabin door. The knock detection device preferably comprises an evaluation device that determines whether a knock is present depending on the intensity of the vibration or the volume of the noise and / or the repetition of a specific intensity or volume.

[0017] Preferably, the safety device comprises a timer for determining the time period.

[0018] Preferably, the transmission device comprises a connection to a server which is spatially separated from the elevator, in particular a wireless connection, in particular an Internet connection.

[0019] This can have the advantage that the signal from the security device can be processed in a spatially separate server in accordance with the Internet of Things and made available worldwide via a browser.

[0020] Further features of the invention are indicated in the drawings.

[0021] The advantages mentioned can also be realized for combinations of features in which they are not mentioned. Overview of the drawings:

[0022] 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. 1A flowchart of the safety device Fig. 2An expanded flowchart of the safety device Detailed description of the drawings:

[0023] Fig. 1shows a flowchart of the safety device 10. The process starts at the presence detection device 11.

[0024] The presence detection device determines whether there is at least one person in the elevator car. If there is no person in the elevator car, the process starts again with the presence detection device 11. However, if the presence detection device detects at least one person in the elevator car, the process continues to the stop state detection device 13.

[0025] The stop state determination device 13 determines whether the elevator car is in the stop state. If the stop state determination device detects that the elevator car is moving, the process returns to the stop state determination device until the elevator stops. However, if the stop state determination device now detects that the elevator car is stopped, the process continues to the door state determination device 14.

[0026] The door state determination device 14 determines whether the elevator door of the elevator car is closed. If the door state determination device detects that the elevator door is not closed, the process begins again with the presence determination device 11. However, if the door state determination device detects that the elevator door is closed, the process continues to the transmission device 15.

[0027] The transmission device 15 uses a timer to determine whether a certain period of time has elapsed since the stop of the elevator car and the simultaneous closed state of the car door were detected. To do so, the transmission device stores the time at which the stop state determination device and the door state determination device simultaneously detect. As long as the time period has not elapsed, the sequence begins again with the presence determination device 11. As soon as the period of time during which the elevator was constantly stopped and the doors were closed has elapsed, the transmission device sends the signal 16 wirelessly via the Internet to a server.

[0028] Fig. 2 shows a flow chart of the safety device 10 as in Figure 1 , which is, however, extended by a knock detection device.

[0029] The function of the presence determination device 11 is as Figure 1 described. In contrast to Figure 1 However, if the presence determination device 11 detects at least one person in the elevator car, the flow passes to the knock detection device 12.

[0030] The knock detection device 12 uses a vibration sensor to determine whether there is a knock on the car door. If the knock detection device does not detect a knock on the car door, the flow begins again with the presence determination device 11. However, if the knock detection device does detect a knock on the car door, the flow continues to the stop state determination device 13.

[0031] The further course is as Figure 1 described. List of reference symbols:

[0032] 10Flowchart of the safety device 11Presence detection device 12Knock detection device 13Stop state detection device 14Door state detection device 15Transmission device 16Signal for alarm

Claims

1. Safety device - for a passenger lift with a lift car with a car door - with a presence detection device for detecting the presence of at least one person in the lift car, - with a stop state detection device for detecting the stop state of the lift car, - with a door state detection device for detecting the closed state and the duration of the closed state of the lift car door, and - with a transmission device for transmitting a signal to a supervisory authority, characterized in that- the transmission device is designed to - transmit the signal when - the door state determination device determines the closed state for the car door and - the presence determination device determines at least one person in the elevator car and - the stop state determination device determines the stop state of the elevator car and - a certain period of time has elapsed since which - the stop state determination device has continuously determined the stop state of the elevator car and - the door state determination device has continuously determined the closed state of the car door.

2. Safety device according to claim 1 characterized in thatthe safety device - comprises a knock detection device - for determining a knock on the cabin door, and - the transmission device is designed to - transmit the signal when - a knock has been registered by the device for detecting mechanical or acoustic vibrations during the specific period of time.

3. Safety device according to claim 1 characterized in that the safety device - the knock detection device - comprises a vibration sensor for detecting the vibration or a microphone for detecting the noise of the cabin door and - comprises an evaluation device which determines a knock as a function of the strength of the vibration or the volume of the noise and / or the repetition of a certain strength or volume.

4. Safety device according to claim 1 characterized in that - the safety device includes a timer - for determining the duration.

5. Safety device according to claim 1 characterized in that - the transmission device comprises a connection to a server which is spatially separated from the elevator, - in particular a wireless connection, - in particular an Internet connection.

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