Wireless smoke and fire detection system and method

• US 7,733,235 B2
• Filed: 10/30/2007
• Issued: 06/08/2010
• Est. Priority Date: 10/30/2007
• Status: Expired due to Fees

• Current Assignee: Derrick U. Hall, Herbert Baker, Joseph J. Kindler, Shawnfatee M. Bridges
• Original Assignee: Derrick U. Hall, Herbert Baker, Joseph J. Kindler, Shawnfatee M. Bridges
• Inventors: Kindler, Joseph J., Bridges, Shawnfatee M., Baker, Herbert, Hall, Derrick U.
• Primary Examiner(s): Wu; Daniel
• Assistant Examiner(s): Tang; Son M
• Application Number:
  US11/927,886
• Publication Number:
  US 20090109016A1
• Time in Patent Office: 952 Days
• Field of Search: 340/539.27, 340578-579, 340/581, 340/628, 340/573, 340/524, 340/501
• US Class Current: 340/628
• CPC Class Codes: G08B 1/08 using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion

Abstract

A smoke detector system employs smoke detectors that enter a “lockout period” following receipt of an alarm signal, during which time a detector will not receive a RF alarm signal and will not transmit a RF alarm signal after a certain period of time if that detector does not detect, or no longer detects, a dangerous condition. The lockout period is of sufficient duration to prevent re-transmission of a RF alarm signal by a detector even though it may have received a RF alarm signal from another detector(s). Hence, after a short period of time, no RF alarm signals will be received or transmitted and each detector resets, unless a dangerous condition is detected.

Claims

1. In a RF wireless alarm system having a plurality of detectors for detecting smoke or fire, wherein, in operation, each detector detects the presence of smoke or fire and provides an alert in response thereto from an integral alarm, transmits a wireless alarm signal in response to detecting smoke or fire, receives alarm signals transmitted by other detectors and provides the alert from the integral alarm in response thereto, and transmits alarm signals in response to receipt of alarm signals from another detector, a method comprising:

discontinuing receipt of any alarm signal from any detector for a lockout period, after a first detector has received a transmitted alarm signal;

transmitting alarm signals from the first detector for a period of time after the first detector received a transmitted alarm signal;

discontinuing transmission of alarm signals from the first detector, and again receiving and transmitting the alarm signal from the first detector if the alarm signal is received from a second detector after the lockout period has expired; and

during the lockout period, any detector that initiated the alarm signal is able to discontinue transmission of its alarm signal if the smoke or fire condition causing the transmission of the alarm signal from the detector has abated, without responding to alarm signals from the first detector that would otherwise cause alarm signal transmission from the initiating detector when no detector senses a smoke or fire condition.

2. The method of claim 1 wherein the transmission period is shorter than the lockout period.

3. The method of claim 1 wherein the transmission period ends before the lockout period ends.

4. The method of claim 1 wherein the lockout period is adjustable.

5. The method of claim 1 wherein the transmission period is adjustable.