Elevator motion alert system

Abstract

An elevator motion alert system is configured to alert a person of an object moving in at least one hoistway of an elevator system. The elevator motion alert system includes a sensor configured to detect object motion. A transmitter of the elevator motion alert system is carried by the object and is configured to transmit a pressure wave at a pre-defined frequency upon movement of the object. An electronic device of the elevator motion alert system is configured to receive and process the pressure wave for alerting the person of object movement.

Claims

1. An elevator car motion alert system for signaling motion of at least one elevator car to a person, the elevator car motion alert system comprising: a plurality of motion sensors configured to detect car motion, wherein each one is carried by a respective elevator car of the at least one elevator car; a plurality of transmitters carried by a respective elevator car of the at least one elevator car, and each configured to broadcast a pressure wave having a predefined unique frequency specific to each one of the at least one elevator car and upon movement of a respective elevator car of the at least one elevator car and detected by a respective motion sensor of the plurality of motion sensors; and an electronic device configured to receive and process the pressure wave for alerting the person of the movement of the respective elevator car, and is configured to recognize the predefined unique frequency broadcasted by each one of the plurality of transmitters and assign the recognized unique frequency to the respective elevator car of the at least one elevator car.

2. The elevator car motion alert system set forth in claim 1, wherein the pressure wave includes a DTMF communication protocol.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Various features will become apparent to those skilled in the art from the following detailed description of the disclosed non-limiting embodiments. The drawings that accompany the detailed description can be briefly described as follows:

(2) FIG. 1 is a schematic of an elevator system utilizing a motion alert system as one exemplary embodiment of the present disclosure; and

(3) FIG. 2 is a schematic of a second embodiment of the elevator system.

DETAILED DESCRIPTION

(4) Referring to FIG. 1, an exemplary embodiment of an elevator system 20 is illustrated. The elevator system 20 may include a cable 22 that extends between and is engaged to first and second objects 24, 26. The first object 24 may be an elevator car and the second object may be a counterweight. The elevator car 24 and counterweight 26 may be located and adapted to move in a hoistway 28 that may be defined by a structure 30. The cable may further wrap about a rotating sheave 34 driven by a motor 36. When the motor 36 receives a drive signal to raise the elevator car 24, the sheave is driven in a first rotational direction and the counterweight 26 lowers to assist raising of the car. When the motor 36 receives a drive signal to lower the elevator car 24, the sheave is driven in an opposite rotational direction and the counterweight 26 rises as the elevator car 24 is lowered.

(5) The elevator system may further include a motion alert system 38. The motion alert system 38 may include a sensor 40, a transmitter 42 and an electronic device 44 that may be mobile. The sensor 40 and the transmitter 42 may be in and/or carried by elevator car 24. The electronic device 44 may be carried by a person 46 who may benefit by being alerted when movement of the elevator car 24 occurs. For example, the person 46 may be a maintenance repairman who must work within the confines of the hoistway 28 and who may benefit via knowledge of elevator car motion.

(6) The sensor 40 detects elevator car motion and may be configured to send a motion detected signal (see arrow 48) to the transmitter 42. The transmitter 42 is configured to receive the motion detected signal 48 and broadcast a pressure wave 50 (i.e., sonic wave) that may travel at least within the hoistway 28. The electronic device 44 may include a microphone 52 adapted to receive the pressure wave 50. The pressure wave 50 may be transmitted at a pre-scribed frequency indicative of elevator car motion and recognizable by the electronic device. Upon receipt and recognition of the pressure wave 50, the electronic device 44 is configured to alert the person 46 of the elevator car 24 motion. The alert may be of any variety including, as an example, a flashing light, a vibration, an audible alert, a written alert that appears on a screen of the electronic device, or any combination thereof. It is further contemplated and understood that the sensor 40 may be configured to output a first signal indicative of upward motion and a second signal indicative of downward motion. The transmitter 42 may then output pressure waves at two different frequencies indicative of the respective upward and downward motions.

(7) It is further contemplated and understood that the pressure wave 50 may be at a single frequency regardless of upward or downward motion. In this example, the transmitter 42 may utilize dual-tone multi-frequency (DTMF) or a Morse code (i.e. time division multiplexing) which may apply a communication protocol to individually identify the upward motion state, the downward motion state and other states.

(8) The sensor 40 may be a dedicated component of the motion alert system 38 or may be part of the overall elevator control system (not shown) which is configured to know, for example, which elevator cars 24 are moving, in which direction, and in which of a plurality of hoistways 28. The motion detected signal 48 may be received by the transmitter 42 directly from the sensor 40 or may come elsewhere from the elevator control system. The sensor 40 may be any variety of sensors capable of detecting elevator car motion including a position sensor or an accelerometer. It is further contemplated and understood that the sensor 40 may not be in the elevator car 24 and/or may send the signal 48 wirelessly. Furthermore, the transmitter 42 may not be carried by the elevator car 24 and instead may be strategically located within the hoistway 28 and/or in a location where the pressure wave is desired to be received. Moreover, the transmitter 42 may be mounted on the top or the bottom of the elevator car 24 depending on the desired direction of the pressure wave broadcast. Yet further, each elevator car 24 may carry two transmitters for broadcasting in respective upward and downward directions. As a further example, the car 24 and the associated counterweight 26 may transmit different signals since they are moving in opposite directions.

(9) The motion alert system 38 may include a second transmitter 54 and a second sensor 56 that may be carried by the counterweight 26. Upon a motion signal 58 from the second sensor 56, the transmitter 54 may broadcast a second pressure wave 60 in the second hoistway 32 that has a frequency different that the first pressure wave 50. The second pressure wave 60 may be received by the electronic device 44, as described above, to alert the person 46 of the counterweight motion. The electronic device 44 may be pre-programmed to recognize the difference between the two pressure waves 50, 60 and may therefore provide distinctive alerts to the person 46. The alert, for example, may serve as a safety feature if the person 46 is in the second hoistway 32. It is further contemplated and understood that other sensors and transmitters may be included to, for example, signal/alert motion of elevator doors that may indicate a second person has entered a hoistway location (e.g., second repairman).

(10) As another example, the motion alert system 38 may be applied to a ropeless elevator system (not shown) having multiple elevator cars 24 in any one of a plurality of hoistways 28. The transmitters 42 in each elevator car 24 may broadcast pressure waves 50 that each have distinctive frequencies indicative of a particular elevator car and/or a particular hoistway. The electronic device 44 may be pre-programmed to recognize the distinctive frequencies and thus identify which elevator car 24 is in motion, in which direction, and in which hoistway. The person 46 may then be appropriately alerted.

(11) It is further contemplated and understood that the pressure waves 50 may not be audible and/or may be greater than about 17 kHz Because the pressure waves 50 may not be audible, any passengers 62 in the elevator car(s) 24 may not be needlessly alarmed. Alternatively, the pressure waves 50 may be audible and/or may have frequencies in the range of about 20 Hz to about 17 kHz. Preferably, the broadcasting frequencies are within lower ranges to promote broadcasting at greater distances.

(12) The electronic device 44 may be mobile and capable of being carried by the person 46 during, for example, maintenance and/or repair of the elevator system 20. The electronic device 44 may be a cellular telephone and/or a smart phone having a pre-programmed application capable of performing the frequency recognition and alert functions described above. The electronic device 44 may further include DTMF capability for recognition of the various motion states (e.g., car upward, car downward, door closing, door opening, etc.) via the pressure wave(s) 50. That is, the electronbic device 44 may respond differently to different conditions and/or moving objects (e.g., car approaching versus moving away and/or car 24 versus the counterweight 26). It is further contemplated and understood that the electronic device 44 may not be carried by the mechanic, and instead, may be mounted, for example, in the pit area of the hoistway 28.

(13) It is further contemplated and understood, that traditional elevator controllers (not shown) include controller software that is generally the commander that commands the elevator car 24 to move. As such, the transmitter 42 (or a second transmitter) may be configured to receive signal(s) from the controller indicative of anticipated or controller elevator car motion. When such a signal is received from the elevator system controller, the transmitter 42 may emit a similar pressure wave as previously described with the sensor 40.

(14) Referring to FIG. 2, a second embodiment of an elevator system is illustrated wherein like elements to the first embodiment have like identifying numerals except with the addition of a prime system. The elevator system 20 includes a first elevator car 24 adapted to travel in a first hoistway 28 and a second elevator car 70 adapted to travel in a second hoistway 72. The hoistways 28, 72 may be in communication with one-another, at, for example, a pit area and such that a person or mechanic 46 may be beneath any one of the cars 24, 70 at any given moment.

(15) A motion alert system 38 may include an electronic device 44, a sensor 40 and a transmitter 42 associated with the elevator car 24 and a sensor 76 and a transmitter 78 associated with the second car 70. Each transmitter 78 may emit a distinctive pressure wave indicative of the specific car, and that may be associated with the direction of travel. An electronic device 44 is configured to recognize the variety of distinctive pressure waves and alert the person 46 accordingly.

(16) The sensor 40 detects elevator car motion and may be configured to send a motion detected signal (see arrow 48) to the transmitter 42. The transmitter 42 is configured to receive the motion detected signal 48 and broadcast a pressure wave 50 (i.e., sonic wave) that may travel at least within the hoistway 28. The electronic device 44 may include a microphone 52 adapted to receive the pressure wave 50. The pressure wave 50 may be transmitted at a pre-scribed frequency indicative of elevator car motion and recognizable by the electronic device. Upon receipt and recognition of the pressure wave 50, the electronic device 44 is configured to alert the person 46 of the elevator car 24 motion. The alert may be of any variety including, as an example, a flashing light, a vibration, an audible alert, a written alert that appears on a screen of the electronic device, or any combination thereof. It is further contemplated and understood that the sensor 40 may be configured to output a first signal indicative of upward motion and a second signal indicative of downward motion. The transmitter 42 may then output pressure waves at two different frequencies indicative of the respective upward and downward motions.

(17) While the present disclosure is described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present disclosure. In addition, various modifications may be applied to adapt the teachings of the present disclosure to particular situations, applications, and/or materials, without departing from the essential scope thereof. The present disclosure is thus not limited to the particular examples disclosed herein, but includes all embodiments falling within the scope of the appended claims.