Point heat detectors based on surface mounted thermistors

Patent metadata

Field	Value
Publication number	US-12260724-B2
Application number	US-202418648744-A
Country	US
Kind code	B2
Filing date	Apr 29, 2024
Priority date	Sep 22, 2021
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

Devices, systems, and methods for providing point heat detectors based on surface mounted thermistors are described herein. One circuit board for a point heat detector of a fire sensing system includes a circuit board body having number of corners, at least one hole provided in the circuit board body proximate to one of the corners, and a surface mounted thermistor mounted on at least one corner.

First claim

What is claimed:

1. A fire sensing system, comprising:
at least one point heat detector, wherein the at least one point heat detector includes:
a detector housing;
a circuit board body having a number of corners;
a surface mounted thermistor mounted on at least one corner; and
wherein the detector housing includes at least one aperture in a side surface of the detector housing allowing the at least one corner to protrude though the aperture.

2. The fire sensing system of claim 1 , wherein the detector housing further includes at least one cut out portion in the side surface of the detector housing proximate to the at least one aperture allowing the at least one corner to protrude through both the at least one cut out portion and the at least one aperture.

3. The fire sensing system of claim 2 , wherein the detector housing further includes a tamper resistant structure located in the at least one cut out portion and positioned along an outer edge of the side surface of the detector housing.

4. The fire sensing system of claim 1 , wherein the at least one cut out portion has a sloping surface to each side of the aperture to direct airflow toward the surface mounted thermistor.

5. The fire sensing system of claim 1 , wherein the surface mounted thermistor is mounted on each corner of the circuit board body.

6. The fire sensing system of claim 5 , wherein the detector housing includes the aperture in the side surface of the housing allowing each corner of the circuit board body having the surface mounted thermistor thereon to protrude through the aperture.

7. A fire sensing system, comprising:
a plurality of point heat detectors, wherein each point heat detector of the plurality of point heat detectors includes:
a detector housing;
a circuit board body having a number of corners;
a surface mounted thermistor mounted on at least one corner; and
wherein the detector housing includes at least one cut out portion allowing the at least one corner to protrude through the at least one cut out portion.

8. The fire sensing system of claim 7 , wherein the at least one cut out portion has an aperture allowing the at least one corner to protrude through the aperture of the at least one cut out portion.

9. The fire sensing system of claim 8 , wherein the at least one cut out portion has sloping portions that slope toward the aperture of the at least one cut out portion.

10. The fire sensing system of claim 7 , wherein the housing has a bottom surface and wherein the bottom surface has at least one aperture proximate to the thermistor.

11. The fire sensing system of claim 7 , wherein the housing has a tamper resistant structure located in the at least one cutout portion.

12. The fire sensing system of claim 7 , wherein the aperture of the at least one cut out portion is sized to restrict access to a user's fingertip or similar sized object.

13. The fire sensing system of claim 7 , wherein the at least one cut out portion has sloping surfaces to each side of the at least one cut out portion to direct airflow to the surface mounted thermistor.

14. The fire sensing system of claim 13 , wherein the sloping surfaces adjacent to the at least one cut out portion are symmetrical.

15. A fire detection system, comprising:
a fire alarm control panel within a building;
a plurality of point heat detectors located throughout the building, wherein each point heat detector of the plurality of point heat detectors includes:
a detector housing;
a circuit board body having a number of corners;
a surface mounted thermistor mounted on at least one corner; and
wherein the detector housing includes at least one cut out portion allowing the at least one corner to protrude through the at least one cut out portion.

16. The fire detection system of claim 15 , wherein the at least one cut out portion has an aperture allowing the at least one corner to protrude through the aperture of the at least one cut out portion.

17. The fire detection system of claim 16 , wherein the at least one cut out portion has sloping portions that slope toward the aperture of the at least one cut out portion.

18. The fire detection system of claim 15 , wherein the housing has a bottom surface and wherein the bottom surface has at least one aperture proximate to the thermistor.

19. The fire detection system of claim 15 , wherein the surface mounted thermistor is mounted on each corner of the circuit board body.

20. The fire detection system of claim 15 , wherein the detector housing further includes a tamper resistant structure located in the at least one cut out portion and positioned along an outer edge of a side surface of the detector housing.

Assignees

• Honeywell Int Inc

Inventors

• Chiatti Andrea
• Frison Andrea
• Paderno Arturo
• Iurissevich Daniele
• Bellemo Fabio
• Bressanutti Massimo
• Berliavaz Maurizio
• Pecorari Stefano

Classifications

• H05K2201/10151

  Sensor · CPC title

• H05K2201/10022

  Non-printed resistor · CPC title

• H05K2201/09272

  Layout details of angles or corners · CPC title

• H05K1/181

  associated with surface mounted components · CPC title

• G08B17/06 Primary

  Electric actuation of the alarm, e.g. using a thermally-operated switch · CPC title