GB2478512A - Isolator for smoke detector - Google Patents

Isolator for smoke detector Download PDF

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Publication number
GB2478512A
GB2478512A GB0920467A GB0920467A GB2478512A GB 2478512 A GB2478512 A GB 2478512A GB 0920467 A GB0920467 A GB 0920467A GB 0920467 A GB0920467 A GB 0920467A GB 2478512 A GB2478512 A GB 2478512A
Authority
GB
United Kingdom
Prior art keywords
smoke detector
switch
indicator lamp
electrical
isolator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0920467A
Other versions
GB0920467D0 (en
GB2478512B (en
Inventor
Osman Hasan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0920467A priority Critical patent/GB2478512B/en
Publication of GB0920467D0 publication Critical patent/GB0920467D0/en
Publication of GB2478512A publication Critical patent/GB2478512A/en
Application granted granted Critical
Publication of GB2478512B publication Critical patent/GB2478512B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/18—Distribution boxes; Connection or junction boxes providing line outlets
    • H02G3/20—Ceiling roses or other lighting sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

An electrical isolator, for instance for a mains-powered smoke detector, includes a housing 114 containing a circuit board 102. The circuit board includes connectors for connection to a mains supply and to a smoke detector, and also an indicator lamp and a switch 108. When the switch is off the smoke detector is electrically isolated from electrical power and the indicator lamp is extinguished, and when the switch is on the indicator lamp is lit and power is provided to the smoke detector. The isolator also includes a light unit 128 attached to the housing with electrical connection to the mains supply and to a light bulb 126. The lighting unit and the circuit board are connected to the mains supply in parallel, so that when the switch is off the electrical connection of the lighting unit to the mains supply is unaffected. Thus if the smoke detector is defective, the switch can be turned off causing current to cease to flow to the smoke detector and the indicator lamp will extinguish, indicating that it is now safe to work on the smoke detector. The light bulb will remain on, creating an easier working environment.

Description

Patent Application of Osman Hasan for Pendant Isolation Unit
Field of Invention
This invention relates in general to electrical isolators, and more particularly to isolators for smoke detectors.
Background of the Invention
Smoke detectors are an important safety feature of industrial and domestic premises, and provide an early warning of the presence of fire by detecting smoke particles.
Smoke detectors are generally fitted to ceilings, often on halls, landings and stairwells. It can be inconvenient to replace batteries when premises have many smoke alarms, or if they are in difficult to access positions. In such instances smoke alarms that draw on mains power may be used. Such alarms must be first isolated before maintenance, but if the alarms are powered from the lighting circuit, turning off the appropriate electric circuit turns off the lights.
Disclosure of Invention
From the foregoing, it may be appreciated that a need has arisen for an electrical isolator for a smoke alarm isolator unit which allows the lighting circuit to remain switched on when the alarm is being maintained.
The electrical isolator includes a housing inside of which is a circuit board. The circuit board includes connectors providing electrical connection to a mains supply and to a smoke detector. It also has an indicator lamp and a switch. When the switch is off the smoke detector is electrically isolated from electrical power and the indicator lamp is extinguished, and when the switch is on the indicator lamp is lit and electrical power is provided via the electrical connection to the smoke detector. The electrical isolator also includes a light unit attached to the housing and having electrical connection to the mains supply and to a light bulb. The lighting unit and the circuit board are connected to the mains supply in parallel, so that when the switch is off the smoke detector is electrically isolated from electrical power but the electrical connection of the lighting unit to the mains supply is unaffected.
In a further embodiment the electrical isolator additionally includes a buzzer so that when the smoke detector has a fault, the buzzer is sounded, alerting the user to the fault.
This means that if the smoke detector is defective, the switch is turned off and current will cease to flow to the smoke detector and the indicator lamp will extinguish. This is an indication that it is now safe to work on the smoke detector. The light bulb will remain on, creating an easier working environment.
Brief Description of Drawings
For a more complete explanation of the present invention and the technical advantages thereof, reference is now made to the following description and the accompanying drawing in which: Figure 1 shows an which shows an electrical isolator of the present invention; Figure 2 shows a housing which encases component parts of the electrical isolator of the present invention; and Figure 3 shows an example of a lighting unit attached to the electrical isolator of the present invention.
Best Mode for Carrying Out the Invention
Embodiments of the present invention and their technical advantages may be better understood by referring to Figure 1.
Referring to Figure 1, which shows an electrical isolator (100) having a circuit board (102), a first connector (104) provides an electrical connection to the mains supply and a second connector (106) provides an electrical connection to the smoke detector (not shown) A switch (108) and an indicator lamp (110) are connected to the circuit board. When the switch is on', the isolator supplies mains power to the smoke detector. When the switch is off', the isolator isolates the smoke detector from the mains supply. The indicator lamp is lit only when mains power is being supplied to the smoke detector. Preferably the indicator lamp is an LED. Preferably the switch is a slider switch.
A buzzer (112) is connected to the printed circuit board. When the isolator detects a fault condition in the smoke detector, the buzzer sounds, alerting the user to the fault.
Referring now to Figure 2, which shows a housing (114) which encases the circuit board and its components, a grille (116) allows sound from the buzzer to be heard, and a screen (118) for the indicator lamp allows the indicator lamp to be seen from outside the housing. The switch is accessible from the outside of the housing.
Referring now to Figure 3, which shows one example of a lighting unit (128) attached to the isolator, a ceiling rose base (120) sits within the housing and his held in place by a ceiling rose cap (122) which is attached to the housing, either via a screw thread around its perimeter, or by fixing screws.
Cable from a bulb holder (124) passes through the rose and is connected and anchored to the ceiling rose base, as is conventional with ceiling fitments.
The ceiling rose base is of conventional construction and has a first connector providing an electrical connection to a mains supply and a second connector providing an electrical connection to a light. The ceiling rose base and the isolator circuit board are connected to the mains in parallel.
Thus the operation of the switch for the lighting unit does not affect the smoke detector, and isolating the smoke alarm by means of the switch has no affect on the lighting unit.
When the smoke detector is faulty and the isolator detects the fault condition, the buzzer inside the housing will sound to warn the user. To fix the smoke detector, switch (108) is turned off. Current will cease to flow to the smoke detector and indicator lamp (110) will extinguish. This is an indication that it is now safe to work on the smoke detector. Light bulb (126) will remain on, creating an easier working environment. When the smoke detector is fixed, switch (108) is turned on, and indicator lamp (110) will light. This warns the user that current is flowing again to the detector.

Claims (5)

  1. Claims 1. An electrical isolator (100) including: (1) a housing (114), (2) a circuit board (102) located within said housing and including: (a) a first connector (104) providing an electrical connection to a mains supply; (b) a second connector (106) providing an electrical connection to a smoke detector; (c) an indicator lamp (110); (d) a switch (108), whereby when said switch is off said smoke detector is electrically isolated from electrical power and said indicator lamp is extinguished, and when said switch is on said indicator lamp is lit and electrical power is provided via said electrical connection to said smoke detector; (3) a lighting unit (128) attached to said housing and having a first connector providing an electrical connection to a mains supply and a second connector providing an electrical connection to a light; characterised by said lighting unit and said circuit board being connected to said mains supply in parallel, whereby when said switch is off said smoke detector is electrically isolated from electrical power and the electrical connection of said lighting unit to said mains supply is unaffected.
  2. 2. The electrical isolator of claim 1 in which said indicator lamp is an LED.
  3. 3. The electrical isolator of claims 1 or 2 additionally including a screen (118) for said indicator lamp which allows the indicator lamp to be seen from outside the housing.
  4. 4. The electrical isolator of any of the preceding claims additionally including a buzzer (112), whereby when said smoke detector has a fault, said buzzer is sounded.
  5. 5. The electrical isolator of claim 4 additionally including a grille (116) in said housing which allows sound from said buzzer to be heard
GB0920467A 2009-11-23 2009-11-23 Pendant isolation unit Expired - Fee Related GB2478512B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0920467A GB2478512B (en) 2009-11-23 2009-11-23 Pendant isolation unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0920467A GB2478512B (en) 2009-11-23 2009-11-23 Pendant isolation unit

Publications (3)

Publication Number Publication Date
GB0920467D0 GB0920467D0 (en) 2010-01-06
GB2478512A true GB2478512A (en) 2011-09-14
GB2478512B GB2478512B (en) 2014-10-08

Family

ID=41565704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0920467A Expired - Fee Related GB2478512B (en) 2009-11-23 2009-11-23 Pendant isolation unit

Country Status (1)

Country Link
GB (1) GB2478512B (en)

Also Published As

Publication number Publication date
GB0920467D0 (en) 2010-01-06
GB2478512B (en) 2014-10-08

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150108