Fire-extinguishing system

• US 4,227,577 A
• Filed: 04/12/1978
• Issued: 10/14/1980
• Est. Priority Date: 07/26/1976
• Status: Expired due to Term

• Current Assignee: Security Patrols Company Limited
• Original Assignee: Security Patrols Company Limited
• Inventors: Iida, Makoto
• Primary Examiner(s): Marmor, Charles A.
• Application Number:
  US05/895,605
• Time in Patent Office: 916 Days
• Field of Search: 340/522, 340/573, 169/60, 169/61, 169/56, 169/43, 169/46
• US Class Current: 169/61
• CPC Class Codes: A62C 37/00 Control of fire-fighting equipment heat-sensitive devices G01K
• CPC Class Codes: A62C 37/44 only the sensor being in the danger zone
• CPC Class Codes: G08B 19/00 Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow

Abstract

A fire extinguishing system coupled with a guarding system for the protecting same region as covered by the fire extinguishing system, and provided with at least one intrusion sensor arranged at desired locations in the region. The fire-extinguishing system is provided with at least one fire sensor arranged in the region and at least one fire extinguishing device for extinguishing a fire, and is connected to the guarding system by a warning signal transmission device provided with a logic circuit for identifying three different conditions based upon whether the fire sensor(s) detects a breakout of a fire or not and whether the intrusion sensor(s) detects an intruder or not. The above-mentioned fire extinguishing system can be further coupled with a switching device for identifying conditions with regard to whether the fire extinguishing system and the guarding system are intentionally set in a self actuatable condition or not.

Claims

1. A fire extinguishing system coupled with a guarding system for protecting the same region, said guarding system including at least one intrusion sensor positioned in said region for providing an abnormal condition signal when a person is in said region, said fire extinguishing system comprising:

(a) at least one fire sensor for monitoring a condition indicative of a fire and for providing a fire signal upon the sensing of the condition;

(b) at least one fire extinguishing device;

(c) at least one manually operable means for operation by a person to activate said fire extinguishing device; and

(d) logic conduit means coupled to said at least one intrusion sensor, said at least one fire sensor, and said at least one manually operable means wherein said logic circuit means;

(i) provides an actuation signal to said at least one fire extinguishing device when at least one of said at least one fire sensor detects a fire condition in said protected region and at least one of said at least one intrusion sensor does not detect an abnormal condition;

(ii) does not provide an actuation signal to said at least one fire extinguishing device when said at least one fire sensor detects a fire condition in said protected region and said at least one intrusion sensor detects an abnormal condition; and

(iii) provides an actuation signal to said at least one fire extinguishing device when at least one of said at least one manually operable means are actuated.

2. A fire extinguishing system according to claim 1, wherein said fire sensor is a smoke sensor.

3. A fire extinguishing system according to claim 1, wherein said fire sensor is a flame sensor.

4. A fire extinguishing system according to claim 1, wherein said fire sensor is a heat sensor.

5. A fire extinguishing system according to claim 1, further comprising:

(a) a monitoring means for indicating whether said at least one fire sensor and/or said at least one intrusion sensor detect abnormal conditions in said region; and

(b) a switching means for switching on or off a connection between said monitoring means and said logic circuit means.

6. A fire extinguishing system according to claim 5, wherein said switching means is an interface capable of identifying identification elements.

7. A fire extinguishing system according to claim 5, wherein said switching means is an electro-mechanical locking key means.

8. A fire extinguishing system according to claim 5, further comprising an alarm means for issuing an alarm signal in response to actuation of said monitoring means.

9. A fire extinguishing system according to claim 5, wherein said logic circuit means:

(i) provides an actuation signal when said at least one intrusion sensor does not detect an abnormal condition in said region and said at least one fire sensor detects a fire condition in said region while said switching means is set in an on-condition thereof, and

(ii) does not provide an actuation signal when said at least one intrusion sensor does not detect an abnormal condition in said region and said at least one fire sensor detects a fire condition in said region while said switching means is set in an off-condition thereof.

10. A fire extinguishing system according to claim 5, wherein said logic circuit means does not provide an actuation signal when said at least one intrusion sensor detects an abnormal condition in said region, said at least one fire sensor detects a fire condition in said region and said switching means is in the off-condition, wherein said fire extinguishing device can be actuated only by operating at least one of said at least one manually operable means.