FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)
TITLE OF THE INVENTION
An Improved Ignition Key jack for Automobiles.
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTOR/S
Fulambrikar Vilas G
Abraham Gibi George
Mandhare Amol B
Jethawa Rhutesh M Gangurde Mangesh D
All Indian national
of TATA MOTORS LIMITED an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of invention and the manner
in which it is to be performed.

Field of invention:
The present invention is related to the safety features of an automobile and more particularly the present invention relates to an improved ignition keyjack for automobiles to prevent fire hazard due to current leakage in case of faulty contact terminals in the ignition keyjack of an automobile.
Background of invention:
The conventional ignition key jack comprises of thick wires to carry high current from the battery to the key jack of vehicle. When the driver inserts the ignition key and turns it on, current gets distributed to various electrical devices including starter motor of the vehicle. The wires carrying current to the key jack from the battery are live even when the ignition key is taken out from the key jack. Due to faulty terminals within the key jack or improper gaps between the terminals, the current leaks, leading to local heating which damages the combination switch. The leakage of current may happen in unattended vehicle and it may lead to a fire hazard in an unattended or parked vehicle.
Though alternate wiring systems incorporating relays and thereby not allowing current to the key jack when it is off, do exist, adopting such a system for a vehicle already fitted with the former system requires a complete redesign and system overhaul.
The present invention provides a simple and low cost improved ignition key jack to overcome the limitations of the conventional system thereby allowing Original Equipment Manufacturer (OEM) to implement the improved ignition key jack in the existing vehicles without any modification in existing vehicle wiring system.
Object of invention
The main object of the present invention is to provide an improved ignition key jack for automobiles.

Another object of the present invention is to provide an improved ignition key jack for automobiles which prevents the fire hazards in un-attended or parked vehicles.
Yet another object of the present invention is to provide an improved ignition key jack for automobiles which is simple in construction and cost effective.
Brief description of Invention:
In accordance with the present invention, an improved ignition keyjack for an automobile comprises; a key jack means 04 ; a power source 02 ; a first electrical loads 06; a second electrical loads 03; a third electrical loads 01; a relay means 07 for controlling the power supply; wherein said key jack means 04 comprises a plunger arrangement disposed therein with the help of resilient means, said plunger arrangement comprise a base member 09 having a stud member 08 such that insertion of ignition key means 05 in said key jack 04 presses said base member 09 thereby moving said stud member 08 for completing the coil circuit of said relay means 07; a resistance means 10 for controlling the electric current through the coil of the said relay means 07.
Said stud member 08 is made up of electrically conducting materials and said base member 09 is made up of electrically non -conducting or insulating materials.
Brief description of drawings:
Figure-01 which shows the circuit diagram for the ignition switch in accordance with the present invention.
Figure-02 which shows the circuit diagram for the ignition switch with double pole single throw switch arrangement in accordance with the present invention
Detailed description of invention:

Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same,
Now referring to figure-01 which shows the circuit diagram for the ignition switch in accordance with the present invention, an improved ignition key jack for an automobile comprises; a key jack means 04 ; a power source 02 ; a first electrical loads 06; a second electrical loads 03; a third electrical loads 01; a key means 05; a relay means 07 for controlling the power supply; wherein said key jack means 04 comprises a plunger arrangement disposed therein with the help of resilient means, said plunger arrangement comprise a base member 09 having a stud member 08 such that insertion of ignition key means 05 in said key jack presses said base member 09 thereby moving said stud member 08 for completing the coil circuit of said relay means 07; a resistance means 10 for controlling the electric current through the coil of the said relay means 07.
The key jack means 04 comprises a plunger arrangement disposed therein with the help of resilient means 8a, said plunger arrangement is provided with a base member 09 which is having a stud member 08 .The insertion of ignition key means 05 in said key jack means 04 presses said base member 09 thereby moving said stud member 08 for completing the coil circuit of said relay means 07 with the help of contact points. The contact points are provided in the said key jack means 04.
The said relay means 07 connects the said power source 02 such as battery to the ignition switch terminals when the said relay means 07 is energized, and cuts off the power from the said battery when said relay means 07 is de-energized.
Said stud member 08 is made up of electrically conducting materials and said base member 09 is made up of electrically non-conducting or insulating materials. The plurality of electrical load interface comprises a first electrical loads 06, a second electrical loads 03 and a third electrical loads 01.
The first electrical loads 06 are parking lamp, hazard warning lamp etc. The second electrical loads 03 are headlamp, turn indicators, A/C blower etc. The third

electrical loads 01 is accessories like a music player which becomes operational upon insertion of key means 05 in said key jack means 04 without turning it ON.
The said plunger arrangement is disposed in said key jack means 04. Said base member 09 is made up of electrically insulating material. Said base member 09 is attached to said stud member 08 which is made up of electrically conducting material.
Said resilient means is a spring means (8a) which is loaded against the said base member 09 of said plunger arrangement disposed in the said key jack means 04.
When the ignition key is inserted in the said key jack means 04, the key means 05 presses the said base member 09 of the said plunger arrangement of said key jack means 04. The movement of said base member 09 enables to move the said stud member 08 which touches the contact points to complete / close the circuit of the solenoid of the said relay means 07 which energizes the solenoid of said relay means 07.
Once the relay solenoid is energized, the said relay means 07 is closed allowing electrical connection between said battery source 02 and ignition switch. When the key means 05 is removed, the solenoid coil of the said relay means 07 gets de-energized and the said relay means 07 is open to cut the connection between the said battery 02 and the ignition switch.
The said relay means 07 is interfaced with said first electrical load 06 and said key jack means 04 such that only the first electrical loads 06 such as parking lamp and hazard warning lamp are directly connected to the said power source or battery 02 and is operative even when the said key means 05 is removed form the said key jack means 04.
Alternatively, said relay means 07 is interfaced with said first electrical load 06 and said key jack means 04 such that the first electrical loads 06 such as parking lamp, stop lamp, hazard warning lamp and roof lamp are connected to the said power source or battery 02 through the said relay means 07 to enable said first electrical load 06 to be operative even when the said key means 05 is removed form the said key jack means 04.

The said first electrical load 06 is interfaced with relay means 07 through a double pole single throw switch 06a which operates the relay coil circuit and the circuit of said first electrical load 06 simultaneously.
The said resistance means 10 is interfaced between power source or battery 02 through said relay means 07 and said key jack means 04. The said resistance means 10 is provided for controlling the electric current through the coil of the said relay means 07.
The said plunger arrangement of said key jack means 04 closes and energizes said relay means 07 when the ignition key is inserted in the said key jack means 04. The said plunger arrangement of said key jack means 04 opens and de-energizes the said relay means 07 when the ignition key means 05 is removed from the key jack means 04.
Advantages
The present invention is simple in construction and cost effective. The present invention is capable of addressing the limitation of conventional system such as current leakage and local heating leading to fire hazard in an un-attended or parked vehicles.
The present invention is a low cost solution to safeguard against fire hazard. This also prevents current leakage and thereby keeps battery in good condition.The ignition switch acts as the master switch. The arrangement of present invention can be retrofitted on the existing wiring harness. The components and technology used are simple.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.

We Claim:
1. An improved ignition key jack for automobiles comprises; a key jack means (04) ; a power source (02) ; a first electrical loads (06); a second electrical loads (03); a third electrical loads (01); a key means (05); a relay means (07) for controlling the power supply; wherein said key jack means (04) comprises a plunger arrangement disposed therein with the help of resilient means, said plunger arrangement comprise a base member (09) having a stud member (08) such that insertion of ignition key means (05) in said key jack (04) presses said base member (09) thereby moving said stud member (08) for completing the circuit of said relay means (07); a resistance means (10) for controlling the electric current through the coil of the said relay means (07).
2. The ignition key jack as claimed in claim 1, wherein said re\ay means (07) is interfaced with said power source (02) and said key jack means (04) for energizing the said relay means (07) upon insertion of key means (05) to said key jack means (04) and de-energizing said relay means (07) upon removal of said key means (05) from said key jack means (04).
3. The ignition key jack as claimed in claim 1, wherein plurality of electrical load interface comprises a first electrical loads (06), a second electrical loads (03) and a third electrical loads (01).
4. The ignition key jack as claimed in claim 1, wherein said first electrical loads (06) are parking lamp, hazard warning lamp etc, second electrical loads (03) are headlamp, turn indicators, A/C blower etc and third electrical loads (06) is accessories like a music player which becomes operational upon insertion of key means (05) in said key jack means (04) without turning it ON.
5. The ignition key jack as claimed in claim 1, wherein said stud member (08) is attached to base member (09) and said plunger arrangement is disposed in said key jack means (04).
6. The ignition key jack as claimed in claim 1, wherein said stud member (08) is made up of electrically conducting materials and said base member (09) is made up of electrically non-conducting or insulating materials.

7. The ignition key jack as claimed in claim 1, wherein said resilient means (8a) is a spring which is loaded against the said base member (09) of said plunger arrangement disposed in the said key jack means (04).
8. The ignition key jack as claimed in claim 1, wherein said relay means (07) is interfaced with said first electrical load (06) and said key jack means (04) such that only the first electrical loads (06) such as parking lamp and hazard warning lamp are directly connected to the said power source or battery (02) and is operative even when the said key means (05) is removed form the said key jack means (04).
9. The ignition key jack as claimed in claim 1, wherein said re\ay means 07 is interfaced with said first electrical load 06 and said key jack means 04 such that the first electrical loads 06 such as parking lamp, stop lamp, hazard warning lamp and roof lamp are connected to the said power source or battery 02 through the said relay means 07 to enable said first electrical load 06 to be operative even when the said key means 05 is removed form the said key jack means 04.
10. The ignition key jack as claimed in claim 1, wherein said resistance means (10) is interfaced between power source or battery (02) through said relay means (07) and said key jack means (04). Said resistance means (10) is provided for controlling the electric current through the coil of the said relay means (07).
11. An improved ignition key jack for automobiles as herein substantially described with reference to the accompanying drawings.