Elevator system
AssigneeWestinghouse Electric Corp.
InventorJames Lowry
Life of this patent
Estimating the term…
Abstract
An elevator system including terminal slowdown control which includes a source which provides a beam of electromagnetic radiation, a receiver of such radiation, and spaced markers disposed in a terminal zone which interrupts the beam of electromagnetic radiation as the elevator car approaches a terminal floor. A monitor circuit monitors the receiver to insure that the beam is continuously received when the elevator car is outside of the terminal zone, and to insure that the receiver detects the spaced markers as the elevator car approaches a terminal floor in the terminal zone. The monitor circuit initiates a procedure which takes the elevator car out of service in the event a malfunction in the terminal slowdown control is detected.
Claims14
An elevator system, comprising:
- a structure having a hatchway and a terminal floor,
- an elevator car mounted for movement in said hatchway,
- means for detecting overspeed of the elevator car as it approaches said terminal floor in a predetermined terminal zone adjacent thereto, said means including spaced marker means and detector means mounted for relative movement as the elevator car approaches said terminal floor in said terminal zone,
- said detector means including a source of electromagnetic radiation, and a receiver thereof, mounted such that electromagnetic radiation from the source continuously maintains the receiver in a first condition when the elevator car is outside said terminal zone, and with the spaced marker means disposed to operate said receiver between said first condition and a second condition in response to movement of said elevator car in said terminal zone,
- and monitoring means responsive to the condition of said receiver, including first means which initiates a predetermined change in the operation of said elevator car when the elevator car is located outside said terminal zone and said receiver is in its second condition, and second means which initiates said predetermined change when said receiver fails to switch between its first and second conditions a predetermined number of times as the elevator car approaches said terminal in said terminal zone.
An elevator system, comprising:
- a structure having a hatchway and first and second terminal floors,
- an elevator car mounted for movement in said hatchway,
- means for detecting overspeed of the elevator car as it approaches the first and second terminal floors in predetermined first and second terminal zones, respectively, adjacent thereto, said means including spaced marker means and detector means mounted for relative movement as the elevator car approaches each terminal floor in the associated terminal zone,
- said detector means including a source of electromagnetic radiation and a receiver thereof, mounted such that electromagnetic radiation from the source continuously maintains the receiver in a first condition when the elevator car is in a zone intermediate said first and second terminal zones, and with the spaced marker means disposed to operate said receiver between said first condition and a second condition in response to movement of said elevator car in a terminal zone,
- and monitoring means responsive to the condition of said receiver, including first means which initiates a predetermined change in the operation of said elevator car when the elevator car is located intermediate said first and second terminal zones and said receiver is in its second condition, and second means which initiates said predetermined change when said receiver fails to switch between its first and second conditions a predetermined number of times as the elevator car approaches either terminal in its associated terminal zone.
Dependencies are inferred from the claim text.