Method of monitoring elevator hoistway doors

• US 20040007429A1
• Filed: 05/02/2003
• Published: 01/15/2004
• Est. Priority Date: 05/03/2002
• Status: Active Grant

• Current Assignee: Inventio AG (Schindler Holding AG)
• Original Assignee: Inventio AG (Schindler Holding AG)
• Inventors: Baumgartner, Urs, Angst, Philipp
• Granted Patent: US 6,945,363 B2
• Time in Patent Office: Days
• US Class Current: 187/317
• CPC Class Codes: B66B 13/143 electrical

Abstract

A method for monitoring shaft doors of a elevator installation uses at least one contactlessly acting shaft door monitoring sensor to emit a beam of electromagnetic waves, wherein at least during specific detection phases the beam extends over several floors and is detected by a receiver. The beam is influenced by a shaft door panel not being completely closed and/or a shaft door lock not being disposed in the locking setting such that a disturbance signal is generated to the elevator control.

Claims

1. A method of monitoring shaft doors of a elevator installation with a elevator shaft and a elevator car vertically movable along one shaft wall, wherein the shaft wall has several shaft doors each with at least one horizontally displaceable shaft door panel, wherein when the elevator car stops at a floor at least one shaft door panel of the shaft door respectively opposite the elevator car is opened and closed by a corresponding car door panel, wherein the elevator installation includes an elevator control by which the movements of the elevator car, the car door panel and thus the respectively corresponding shaft door panel are controlled, and wherein a closed setting of the shaft door panel is monitored by at least one contactlessly-acting shaft door monitoring sensor emitting electromagnetic waves, comprising the steps of:

a. emitting from an emitter at least during specific detection phases a beam in the form of electromagnetic waves and extending over several floors in the elevator shaft;

b. detecting the beam with a receiver arranged so that when one of the shaft door panels is not completely closed and/or a shaft door lock is not disposed in locking state the beam is influenced in such a manner that it is recognized by the receiver that the one of the shaft doors is not completely closed and/or not locked; and

c. generating a disturbance signal from the shaft door monitoring sensor to the elevator control in response to the influenced beam.

2. The method according to claim 1 including a step of responding to the disturbance signal by stopping the elevator car when in motion and/or activating at least one of optical and acoustic alarm signals on at least one of the floors.

3. The method according to claim 1 wherein said step a. is performed by emitting a focussed beam of incoherent light waves or a laser light beam of coherent light waves.

4. The method according to claim 3 wherein the beam is formed of light in wavelength ranges of ultraviolet light, visible light or infrared light.

5. The method according to claim 1 including mounting a receiver a distance of several floors from an emitter, operating the emitter to perform said step a., performing said step b. by determining whether the beam reaches the receiver or is interrupted as a consequence of a shaft door panel which is not completely closed or a shaft door lock which is not disposed in locking state.

6. The method according to claim 1 including operating the emitter to emit the beam only during a detection period of operation of the elevator installation.

7. The method according to claim 1 including providing a reflection surface mounted several floors from the emitter and the receiver and oriented so that the beam arriving from the emitter is reflected to the receiver.

8. The method according to claim 7 wherein the reflection surface is a main reflection surface and including ascertaining a reference distance covered by the beam on its path from the emitter by way of the main reflection surface and back to the receiver.

9. The method according to claim 8 including ascertaining a current distance covered by the beam between the emitter and the receiver, comparing the current distance with the reference distance and performing said step c. when the current distance is shorter than the reference distance.

10. The method according to claim 8 where the current distance is ascertained by one of measurement of the transit time of individual pulses of the electromagnetic wave forming the beam and measurement of the shift, which occurs between emission and reception, of the phase position of the coherently emitted electromagnetic waves forming the beam.

11. The method according to claim 1 including performing said steps a. through c. independently for each shaft door panel and each shaft door lock associated with the elevator installation.

12. The method according to claim 1 including reflecting the beam to define at least two spaced apart vertical paths in the elevator shaft between the emitter and the receiver.

13. The method according to claim 1 including activating remotely controllable auxiliary locks acting on the shaft door panels in response to the disturbance signal when the beam is influenced by an incompletely closed shaft door panel during an operational state in which all shaft doors should be closed.

14. The method according to claim 1 including activating at least one of an optical alarm signal, an acoustic alarm signal and a remotely controllable auxiliary lock acting on the shaft door panel at a floor in response to the disturbance signal when the beam is influenced at that floor.