The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1988
Filed:
Apr. 04, 1986
Hiromitsu Ishii, Chiba, JP;
Hochiki Corporation, Tokyo, JP;
Abstract
An analog fire detector which comprises sensor means for detecting, in analog form, one or more kinds of quantity of state which change due to fire; a sampling means for sampling the detection outputs from the sensor means with a predetermined period; and fire determining means which predicts future fire data changes from the sampling data and generates a fire determination output signal when the prediction data satisfies predetermined fire conditions. The invention also provides an analog fire alarm system which comprises a central signal station; a plurality of on-off type fire detectors connected to a pair of power supply/signal lines connected to said central signal station in such a manner that the signal lines are short-circuited into low impedance when the value of a quantity of state changed due to a fire exceeds a threshold value; and an intelligent fire detector installed in specific areas, where the signal lines are extended, such as an important supervisory area or an area where a false alarm is liable to occur, and adapted to short-circuit the signal lines into low impedance when a predicted value of a future quantity of state changing due to a fire satisfies predetermined fire conditions; such intelligent fire detector being the analog fire detector mentioned above.