Hoistway access detection system
AssigneeOtis Elevator Company
InventorsHelio Tinone, Frank W. Adams
Life of this patent
Estimating the term…
Abstract
An improved hoistway access detection system including three safety chains, one for monitoring door position on the even numbered floors, one for monitoring door position on the odd numbered floors, and one for monitoring the position of the pit door, wherein an elevator car is slowly moved to the alternate floor upon detection and subsequent closure of an open pit door and any landing door.
Claims11
A method for detecting intrusion into a hoistway of elevator, the hoistway including multiple landing doors, door sensors at each landing for monitoring the position of the landing doors, the hoistway being adapted for movement of an elevator car therein, the hoistway further including a first safety chain comprising outputs from the door sensors from the even numbered landings electrically connected in series, and a second safety chain comprising outputs from the door sensors from the odd numbered landings electrically connected in series, the method for detecting comprising:
- determining whether said first safety chain is open;
- determining whether said second safety chain is open;
- and
- executing a hoistway detection mode wherein said elevator car is prevented from moving upon the determination that said first safety chain, and said second safety chain are open.
A detection system for a hoistway, the hoistway including multiple landing doors, door sensors at each landing for monitoring the position of the landing doors, the hoistway being adapted for movement of an elevator car therein, the detection system comprising:
- a first safety chain comprising outputs from the door sensors from the even numbered landings electrically connected in series;
- a second safety chain comprising outputs from the door sensors from the odd numbered landings electrically connected in series;
- and
- a controller for monitoring the first and second safety chains and for controlling movement of the elevator car within the hoistway, said controller executing a hoistway detection mode wherein said elevator car is prevented from moving upon a determination that the first and second safety chains are open.
A method for detecting intrusion into a hoistway of elevator, the hoistway including multiple landing doors, door sensors at each landing for monitoring the position of the landing doors, a pit located at the bottom of the hoistway having a pit door providing access thereto, the pit door position being monitored by a pit door sensor, the hoistway being adapted for movement of an elevator car therein, the hoistway further including a first safety chain comprising outputs from the door sensors from the even numbered landings electrically connected in series, a second safety chain comprising outputs from the door sensors from the odd numbered landings electrically connected in series, and a third safety chain comprising the output from the pit door sensor, the method for detecting comprising:
- determining whether said first or second safety chain is open;
- determining whether said third safety chain is open;
- and
- executing a hoistway detection mode wherein said elevator car is prevented from moving upon a determination that said first safety chain or second safety chain and said third safety chain is open.
Dependencies are inferred from the claim text.