FORM - 2
THE PATENTS ACT, 1970 (39 of 1970)
COMPLETE SPECIFICATION
(Section 10, rule 13)
KEY REMINDER SYSTEM FOR AUTOMOBILES
NAME OF THE APPLICANT: SAIRAJ PRAKASH DESHMUKH
Residing at
Tolani Maritime Institute, Sl/Blockl6, Chakan Road, Induri, Pune, 410507, Maharashtra, India.

FIELD OF INVENTION
The invention leads to the field of Mechanical, Automobile, Electronics & Electrical Engineering. It is associated with the day to day life of humankind. Particularly this invention is an alert system, designed to remind of the key which is forgotten mistakenly in any of the key slots by the driver while leaving the vehicle. If the key is left unexpectedly, the buzzer in the circuit makes sound & reminds the driver to take it out.
BACKGROUND OF THE INVENTION
Sometimes, the key is left unknowingly in the key slots such as that of Ignition key slots, doors & dickey key slots of vehicles. Hence due to such mistakes there are chances of theft of the vehicle. Therefore by designing a key reminder circuit, it will remind the driver to take out the key & keep it safely.
Accordingly to prior work it is observed that, the vehicles ranging from low cost to a higher cost are not provided with this kind of simple and economical circuit arrangement to remind that, the key is left in the slot, especially for bikes & scooters.
PRIOR ART
There have been a various types of electronic and electrical circuits earlier for the same application but use of least components as in here reduce the complexity and cost. It is observed that there is a need to make the feature of key reminder available to all the vehicles, ranging from a very low cost to a higher cost, to make it more economical keeping in mind the different economical conditions of the world where people prefer safety at a cheaper price and also there are chances of happening of theft.
OBJECTIVES OF INVENTION
The objective of the invention is to provide a reliable and cost efficient system for key reminder in vehicles. Yet another object of the system is that, the circuit is equipped with a microcontroller, responsible for switching OFF the power supply to the buzzer if there is any problem in future with the mechanical contact of switches due to rust or misalignment due to vibrations between contact parts.

SUMMARY OF INVENTION
According to this invention there is provided system for vehicle safety from theft and misplacing of key by reminding the driver by a buzzer sound. Also the system consists of a safety measures to protect the components in the circuit in case there is a failure in the switches or contacts.
The system comprises of Buzzer, Microcontroller, Normally Closed type Relay switch, Push button switches, and Two-way switch
DETAIL DESCRIPTION OF ACCOMPANYING DIAGRAM
In Figure 1, the numbers indicate:-
Reference numeral 1 relates to Battery
Reference numerals 2 & 3 relate to Push button switches
Reference numeral 4 relates to Two-way switch
Reference numeral 5 relates Buzzer
Reference numeral 6 relates to Microcontroller
Reference numeral 7 relates to Normally Closed type Relay switch (N/C relay switch)
Reference numeral 8 relates to Engine
Reference numerals 9, 10 and 11 relate to Resistors
Reference numeral 12 relates to Ignition key slot
Reference numeral 13 relates to Dickey lock
TERMINOLOGY
Battery: Source of electric power to run the circuit.
Push Button Switches: Device for making and breaking the connection in an electric circuit.
Two-Way Switch: Device for shifting of the power source to two different devices as per requirement.
Buzzer: An electrical device that makes buzzing noise and is use for signaling.
Microcontroller: A computer present in single Integrated Circuit dedicated to perform one task and execute one specific application.
N/C Relay Switch: An electromagnetic switch operated by relatively small electric current that can turn OFF a much larger current.
Engine: Device responsible for driving the vehicle.
Resistor: Component that regulates or limits the flow of electric current

DETAILED DESCRIPTION OF THE INVENTION
The invention will now described in relation to the accompanying drawing in which Figure-1 illustrate a system used to remind of the key left in the key-slot by the driver. The system is powered by an electric Battery (1). One Terminal of Battery is connected to the Push button switch (2) followed by a Two-way switch (4). In this case when the key is inserted into the ignition key slot (12), the key presses the push button switch (2). It is further connected to the Two-way switch (4), this Two-way switch(4) is at Position-1, the electric current is passed on further to the Microcontroller^), followed by a N/C closed Relay switch (7), and then the Buzzer (5).
As soon as the key is inserted in the ignition key slot (12), due to pressing of Push Button switch (2) by the key the circuit is completed and buzzer (5) sounds. When the driver turns the key into ignition or accessories mode i.e. Position-2, the Push Button (2) is still into operation, but the Two-way switch (4) which is arranged just below the Push Button switch (2), shifts to position-2. This cuts the supply to the Buzzer (5) stopping it from making sound. Whereas, the current is supplied to different electronic components in the vehicle and the Engine (8). When the operator again turns the key to position-1 and switches OFF the Engine (8) the circuit is completed again and Buzzer (5) makes sound.
In case there is a failure in the said switches and are stuck at one position due to unavoidable reasons, and the Buzzer (5) is continuously sounding. Then the Microcontroller (6) does the work. It is programmed for a desired time interval. When a particular time crosses say for e.g.: 3 minutes, then the Microcontroller^) immediately gives an electric signal from its port pin to the N/C Relay switch(7), this electric signal shifts the N/C Relay(7) to normally open position, further avoiding the current to pass and hence stops the Buzzer(5) from sounding and avoids damaging of Battery(l) and other components.
In case if the person forgets the key into the door or dickey key lock (13), generally in scooter. The Push Button(3) does the work for such condition and the circuit is powered by same Battery(l) and the current passes through the Resistor(9), Microcontroller^), N/C Relay switch(7) and Buzzer(5) respectively. It works in similar manner as in earlier case.

CLAIMS
I claim that:-
1. The designed system is basically an alert system for a vehicle which can remind the
operator from leaving the key mistakenly in the key slot & thereby avoiding the
chances of theft of the vehicle. Said system comprising of:-
A buzzer to indicate the operator about the key, left mistakenly in the key slot of the system.
If switches are stuck in ON position accidently for longer time, Microcontroller sends a signal to the said N/C Relay switch to cut electrical supply to the Buzzer from stopping it sound.
2. The said system as in claim 1 can be useful for all types of mechanical machines consisting of lock and key arrangement, such as vehicles including cars, bikes, scooters, heavy vehicles and also boats, ships, and aircrafts.
3. Other mechanical devices consisting of the lock & key arrangement as in claim 1, can also be equipped with the said system as in claim 1 to avoid misplacement of the key.
4. Also the said system as in claim 1 can use light or vibrator replacing the said buzzer for signaling the operator.
5. A system as claimed in claim 1 can be further developed to link the said system with mobile phones or nearest electronic devices used by the operator by transmitter and receiver system by vibrating or ringing.