GB2474005A - Bayonet lamp holder with additional constant power supply - Google Patents

Abstract

A bayonet lamp holder has a neutral contact 2, a switched live contact 3, and an additional contact 4 connected to a constant source of power. This allows a light bulb to be switched, while allowing a fire alarm or smoke alarm to receive constant power. The lamp holder may have a further contact (25, Fig 3) and/or make a connection through the base 30. A corresponding device 40 has a bayonet type cap 45 and incorporates a fire or smoke alarm and a further bayonet or screw type socket 42 for a bulb.

Description

Title; The present invention relates to a bayonet type cap, bayonet type lamp holder and a method of connecting it to the ceiling rose, providing the opportunity to connect additional devices between the bulb and the lamp holder.

Background:-

Conventional bayonet type lamp holder connected to ceiling rose provides power to two conductive contacts. When a suitable bayonet cap incorporating for example a bulb is fitted in the socket that forms an electric connection on the bulb's terminals, providing power to the bulb but only when light switch is on.

This invention introduces a method for connection and changes to the bayonet type of lamp holder and bayonet type cap, providing a new way of use for that type of lamp holder.

The method of connection and changes of bayonet socket provide separate constant supply of power to bayonet lamp holder, which could be used by devices (with new design of bayonet cap) requiring a constant power supply, independent of using the light switch.

Key Features:- * Additional connections between ceiling rose and bayonet lamp holder.

* Additional conductive contacts within bayonet lamp holder and a bayonet cap.

Key to the drawings -Fig 1, Fig 3 Bayonet type lamp holder -Fig 2 Ceiling Rose -Fig 4 Top view of conductive pins of bayonet lamp holder -Fig 5 Additional Device and view of the bayonet cap -Fig 6 Additional device( for example fire alarm) and view of the bayonet cap

Full Description:-

Ceiling rose base has supply of power through suitable mains cable Fig 2(22) and suitable switch cable Fig 2(23).

The bayonet lamp holder Fig 1(1), Fig3 (1) has at least three conductive contacts, two sprung as in conventional type Fig 1(2,3) and a third contact preferably in the middle Fig 1 (4), in between the traditional contacts Fig 1(2 & 3). Any additional conductive sprung contact can be fitted on the sides Fig 3 (25), Fig 4 (25).

Third conductive contact may take different shapes. It could be formed as female socket Fig 1 (4), Fig3 (4) or as a traditional male sprung pin Fig 4 (27). Any other conductive contacts Fig 3(25) Fig 4 (25) have to be shaped in form of male sprung pin.

The metal lamp base Fig 1(30), Fig 3(30) can also be used as a conductive contact. The lugs Fig 5(35), Fig (6)35) of the bayonet cap of connected device form an electrical (very low voltage) connection between metal lamp holder Fig 1 (30), Fig 3 (30) and the device Fig 5(40), Fig 6 (40). The metal lamp base Fig 1 (30), Fig 3(30) is connected to the lamp holders terminal Fig 1 (31) which is then connected with the wire Fig 1(21), Fig 2 (21) to the ceiling rose terminal Fig 2 (32).

Two conductive contacts Fig 1 (2 & 3) are connected through preferably flexible, neutral wire Fig 1 (18) and live (switch) wire Fig 1 (19) respectively to terminal blocks Fig 2 (6&7) of ceiling rose base Fig 2 (5). Which forms electrical contact with neutral feed Fig 2 (9) and live (switch) feed Fig 2 (10).

Third conductive contact Fig 1 (4), Fig 3(4) or any other additional contact Fig 4 (25) can be connected through preferably flexible live wire Fig 1 (20) to loop (live) terminal Fig 2 (8) of the ceiling rose Fig 2(5) bringing constant supply of electricity to the lamp holder independent of the light switch operation.

Ceiling rose may incorporate spare terminal Fig 2 (32) in order to form connection with additional sprung contact Fig 4 (25) Fig 3 (25) to bayonet socket Fig 1 (1).

Any other conductive contacts may be used depending on device connected to bayonet type socket.

Examples:-1)

Device Fig 6(40) will incorporate bayonet cap Fig 6(45)) with at least three conductive terminals Fig 6(41, 43), main body Fig 5(40) and a bayonet socket Fig 6(42) or screw type socket with means to connect appropriate bulb.

Detachable fire/smoke alarm Fig 5 (40), Fig 6(40) is designed to be connected to bayonet lamp holder Fig 1(1), Fig 3(1). In order to comply with current building regulations fire/smoke alarm has to have constant power supply. Which is achievable by having extra conductive male pin on the bayonet cap Fig 5(41), Fig 6(41) connected to female socket Fig 1(4), Fig 3(4) of bayonet lamp holder Fig 1(1), Fig 3(1).

Fire/smoke alarm has to be interconnected with other fire/smoke alarms within one dwelling to enable to switch to alarm mode on other fire/smoke alarms in case of discovery of fire. Using extra pin on the bayonet cap Fig 5(41), Fig 6(41) or bayonet cap lugs Fig 5(35), Fig 6(35) provide means for interconnection of those alarms.

Traditional conductive pins Fig 6(43) of bayonet cap will provide live (switch) power supply to the bulbs bayonet holder pin Fig 6(44) and neutral supply to the fire alarms and bulbs neutral terminal.

Therefore proposed improvements and method of connection allow for bayonet type lamp holder to serve electrical power to all sorts of devices which have to have constant power supply and work despite or along with the light switch.

This invention is designed to be used with any type of bayonet fitting and may be manufactured appropriately.

Claims (18)

1. CLAIMS1. An electrical connector adapted to supply a constant power supply and a switched power supply, comprising a bayonet type socket for receiving a fitting, the socket having first and second conductive contacts adapted to connect neutral and switched live electrical supplies respectively, and a third conductive contact adapted to connect a constant live electrical supply.
2. 2. An electrical connector as claimed in claims 1, in which the first and second conductive contacts are two pins.
3. 3. An electrical connector as claimed in claim 2, in which the first and second conductive contacts are sprung.
4. 4. An electrical connector as claimed in any preceding claim, in which the third conductive contact is a pin.
5. 5. An electrical connector as claimed in any one of claims 1 to 3, in which the third conductive contact is a socket.
6. 6. An electrical connector as claimed in claim 4 or 5, in which the third conductive contact is sprung.
7. 7. An electrical connector as claimed in any preceding claim, in which the third conductive contact is positioned between the first and second conductive contacts.
8. 8. An electrical connector as claimed in any preceding claim, in which the third conductive contact is positioned at the centre of the socket.
9. 9. An electrical connector as claimed in any one of claims 1 to 3, in which an internal wall of the socket forms the third conductive contact.
10. 10. An electrical connector as claimed in any preceding claim, in which a plurality of contacts adapted to connect a constant live electrical feed are provided.
11. 1 1. An electrical connector as claimed in any preceding claim, further comprising a fitting receivable by the electrical connector, the fitting having first and second contacts connectable with the first and second contacts of the electrical connector, a third contact connectable with the third conductive contact of the electrical connector, a fire or smoke alarm carried by the fitting and connected to the first and third contacts for receiving a constant supply of power, and a bayonet type socket for receiving a further fitting, the bayonet type socket having further first and second conductive contacts adapted to connect neutral aid switched live electrical supplies respectively.
12. 12. An electrical connector as claimed in claim 11, in which the first and second conductive contacts of the fitting are sockets.
13. 13. An electrical connector as claimed in any one of claim 11 or 12, in which the third conductive contact is a pin.
14. 14. An electrical connector as claimed in any one of claims 11 to 13. in which the electrical device is carried within the fitting.
15. 15. An electrical connector as claimed in any one of claims 11 to 14, in which a bayonet light bulb can be received in the socket of the fitting.
16. 16. An electrical system comprising a ceiling rose, an electrical connector as claimed in any preceding claim, and cable means connecting the ceiling rose to the electrical connector.
17. 17. An electrical system as claimed in claim 16, in which a bayonet type bulb is connected to the fitting.
18. 18. An electrical connector substantially as described herein with reference to and as illustrated in Figures ito 6 of the accompanying drawings.