US 5,347,094 A · Elevator shaftway intrusion device

Abstract

There is provided an elevator shaftway intrusion detector which utilizes a proximity detector including an energy source for generating a detection field within a zone of detection including the elevator shaft-side roof and floor and a corresponding receiver for receiving the detection field when an object enters the detection zone and thereafter generating a detection signal. A power supply and switching network are employed for applying power from the power supply to the proximity detector and which are responsive to the detection signal for applying power from the power supply to a detection indicator such as a siren.

Claims30

Dependent claims

A detection system for detecting intrusion into an elevator shaft having an elevator cab therein and a plurality of elevator shaft access ways in at least one wall of said shaft comprising:

an intrusion detector mounted at a location within said shaft above the elevator cab for monitoring an energy field in a zone of detection including at least a portion of the elevator shaft proximate the top of said cab, or mounted at a location within said shaft below said elevator cab for monitoring an energy field in a zone of detection including at least a portion of the elevator shaft proximate the bottom of said cab, said intrusion detector providing a detection signal representing a disturbance in said energy field caused by an intruder in the shaft, entering said zone of detection,
a power supply for supplying power to said system,
a detection indicator responsive to said detection signal for generating a first audible signal,
and a battery back-up means for providing power to said detection system in the absence or interruption of said power from said power supply means.

1 more element

Dependencies are inferred from the claim text.

Elevator shaftway intrusion device

Life of this patent

Elevator shaftway intrusion device

Life of this patent

Abstract

Claims30