Pneumatic detector assembly with bellows

Patent metadata

Field	Value
Publication number	US-2016110979-A1
Application number	US-201414515886-A
Country	US
Kind code	A1
Filing date	Oct 16, 2014
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

In one aspect, a pneumatic detector assembly is provided. The assembly includes a housing, a sensor tube, a contact pin, and at least one switch having a bellows operatively associated with the sensor tube and the contact pin. The bellows is configured to move into and out of contact with the contact pin based on a pressure in the sensor tube.

First claim

1 . A pneumatic detector assembly comprising:
a housing; a sensor tube; a contact pin; and at least one switch having a bellows operatively associated with the sensor tube and the contact pin, wherein the bellows is configured to move into and out of contact with the contact pin based on a pressure in the sensor tube.

2 . The assembly of claim 1 , wherein the at least one switch comprises an alarm switch, the bellows configured to be out of contact with the contact pin in a normal operating condition and to be in contact with the contact pin in an alarm condition.

3 . The assembly of claim 1 , wherein the at least one switch comprises an integrity switch, the bellows configured to be in contact with the contact pin in a normal operating condition and to be out of contact with the contact pin in a fault condition.

4 . The assembly of claim 1 , wherein the contact pin comprises a first contact pin and a second contact pin, and the at least one switch comprises:
an alarm switch having a first bellows configured to be out of contact with the first contact pin in a normal operating condition and to be in contact with the first contact pin in an alarm condition; and an integrity switch having a second bellows configured to be in contact with a second contact pin in a normal operating condition and to be out of contact with the second contact pin in a fault condition.

5 . The assembly of claim 4 , wherein the first bellows is coupled to the second bellows.

6 . The assembly of claim 1 , wherein the contact pin comprises a first contact pin and a second contact pin, and the bellows includes a contact face,
wherein the contact face is configured to be out of contact with the first contact pin in a normal operating condition and to be in contact with the first contact pin in an alarm condition, and wherein the contact face is configured to be out of contact with the second contact pin in a normal operating condition and to be in contact with the second contact pin in a fault condition.

7 . The assembly of claim 1 , further comprising a power source coupled to at least one of the bellows and the contact pin.

8 . The assembly of claim 4 , further comprising:
a first power source coupled to at least one of the first bellows and the first contact pin; and a second power source coupled to at least one of the second bellows and the second contact pin.

9 . The assembly of claim 6 , further comprising power source coupled to at least one of the bellows, the first contact pin, and the second contact pin.

10 . The assembly of claim 6 , wherein the second contact pin is annular.

11 . A method of assembling a pneumatic detector assembly, the method comprising:
providing a sensor tube; providing a contact pin; providing at least one switch having a bellows; and operatively coupling the bellows to the sensor tube and the contact pin such that the bellows is configured to move into and out of contact with the contact pin based on a pressure in the sensor tube.

12 . The method of claim 11 , wherein the step of providing at least one switch comprises providing an alarm switch, the bellows configured to be out of contact with the contact pin in a normal operating condition and to be in contact with the contact pin in an alarm condition.

13 . The method of claim 11 , wherein the step of providing at least one switch comprises providing an integrity switch, the bellows configured to be in contact with the contact pin in a normal operating condition and to be out of contact with the contact pin in a fault condition.

14 . The method of claim 11 , wherein the step of providing a contact pin comprises providing first contact pin and a second contact pin, and wherein the step of providing at least one switch comprises:
providing an alarm switch having first bellows configured to be out of contact with the first contact pin in a normal operating condition and to be in contact with the first contact pin in an alarm condition; and providing an integrity switch having a second bellows configured to be in contact with a second contact pin in a normal operating condition and to be out of contact with the second contact pin in a fault condition.

15 . The method of claim 11 , further comprising coupling a power source to at least one of the bellows and the contact pin.

Assignees

• Kidde Tech Inc

Inventors

• Frasure David
• Wallace Steven
• Standifer William Brett

Classifications

• G08B17/04 Primary

  Hydraulic or pneumatic actuation of the alarm, e.g. by change of fluid pressure · CPC title

• G01L7/063

  with mechanical transmitting or indicating means · CPC title

• G08B29/043

  of fire detection circuits · CPC title

• G01L19/12

  Alarms or signals · CPC title

• G01L7/06

  of the bellows type · CPC title