Switching arrangement for returning a people-conveying device to

Details Switching arrangement for returning a people-conveying device to Switching arrangement for returning a people-conveying device to

1998-08-17

1999-11-30

Bidwell, James R.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

198323, B66B 2500

Patent

active

059926040

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a re-enabling device for passenger conveyors, more particularly for an escalator or travelator, comprising a plurality of light barriers consisting of emitters and receivers arranged in the vicinity of the step or pallet track in the skirting area, the signals of which are supplied to at least one electronic analyzer which automatically reinstates the ready ON condition of the passenger conveyor after the emergency OFF button has been activated.


FIELD OF THE INVENTION

Disclosed by DE-C 29 41 119 is a method for passenger safety in the travel area of passenger conveyors, more particularly escalators, involving system ON switching by monitoring with a light barrier arrangement and by correspondingly signalling an ON disable means in which light is guided in the light barrier arrangement from at least one emitter to at least one receiver by means of a reflector arrangement and checked for compliance with a predetermined minimum value. Each emitter is assigned a receiver in forming a monitoring section, whereby each monitoring section is monitored in conjunction with the reflector arrangement by "fanned" coverage. The disabled condition of the conveyor is cancelled by means of the ON disable means when the levels of the receiver signals on all monitoring sections exceed the minimum value and their differential quotient equals zero, i.e., the conveyor is only to be enabled when it is assured that no further passanger is present in the travel area of the conveyor. By this system as described above the travel area of the conveyor is monitored over its full area and thus practically totally, i.e., any passenger standing or lying on the conveyor is reliably sensed. In addition, passengers on the move are likewise detected so that the system cannot be re-enabled until nobody is still in the travel area. Thus despite re-enabling being automatic, any hazard to passengers is reliably excluded.


BACKGROUND OF THE INVENTION

Despite the functional safety of this system, it can nevertheless not be excluded that its functioning may be endangered by damage, especially in the case of vandalism, due to it necessarily requiring reflectors. In addition to this the expense in interwiring the light barriers is excessive.


OBJECTS AND SUMMARY OF THE INVENTION

The object of the subject matter of the invention is to further develop a re-enabling device for the passenger conveyors as set forth in the preamble of the first claims so that by configuration the monitoring device is as simple as possible. The expense involved in wiring, on the one hand, and thus also the signalling expense and, on the other, the mounting arrangement in the skirting area can be configured such that replacement of emitters and receivers is facilitated whilst being reliably protected from external effects.
This object is achieved in accordance with the invention by given spacings, the passenger conveyor and of the passenger conveyor without connection to the receivers and emitters provided on the adjacent side by means of connectors.
Further aspects of the subject matter of the invention read from the sub-claims.
Whilst requiring merely two types of emitters and receivers in the light barrier chain a simple wiring arrangement is produced by coded connectors at the emitters and receivers, resulting in short wiring lengths between the components. Needing to connect the right-hand side to the left-hand side of the escalator or travelator is now just as superfluous as is the need to adjust the emitters and receivers.
As in the discussion of prior art, the reenabling device functions only after the emergency OFF button has been activated. Checking the light curtain is done on every emergency OFF action, the control being enabled in the predetermined time, for example, after 20 secs.
For each electronic analyzer roughly 100 emitters and receivers may be provided so that as a rule merely one electronic analyzer is sufficient for each escalator or travelator. The housing for the electronic analyzer is configured preferably modular.
The

REFERENCES:
patent: 5083653 (1992-01-01), Sakata et al.
Lift-Report 1994, Heft 4, S. 94.
TU 1994, Heft 7/8, S.330-331.

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