FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
" A Driveshaft Locking System" 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
INVENTORS
Mrs. Charu Saxena
Amol Majgaonkar. 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 invention and the manner in which it is to be performed.

Field of invention:
The present invention relates to a vehicle stopping system and more particularly it relates to driveshaft locking system of the vehicle at the time of brake failures.
Background of Invention
Typically the conventional brake system comprises master cylinder assembly along with the brake booster assembly, T connector assembly, brake pipe lines with pressure control relief valve,foot controls assembly having a clutch, brake and accelerator pedal. The said brake booster assembly is provided for reducing the braking effort and it is operated by vacuum. The said master cylinder assembly is connected to said brake booster assembly and said master cylinder assembly having primary circuit and secondary circuit called as tandem master cylinder (TMC).
When driver applies the brake with a small travel, the brake oil passes from tandem master cylinder to brake drums of the wheel for stopping the vehicle. In case of failure of said primary circuit and secondary circuit due to bursting of brake pipelines, failure of valve, or damage of brake pipe lines happens due to the obstacles on the road cause the circuit failure then the travel of piston in tandem master cylinder increases and leads to increase in pedal travel of brake system.
This situation may lead to discomfort and the driving person can be in panic situation which may result into an accident.

Normally to stop the vehicle, in case of secondary circuit failure, driver put the vehicle in lower gear which reduces the speed with sudden jerk but this is not effective system for stopping vehicle since when the brake fails the driving person forget to put the vehicle in lower gear in panic situation.
The present invention is an attempt to develop safe and effective system to stop the vehicle, in case of brake failure, to reduce the probability of accident and save the life of occupants.
Object of invention:
The main object of the present invention is to provide a driveshaft locking system
Another object of the present invention is to provide a driveshaft locking system which facilitates passenger safety at the time of failure of braking system.
Another object of the present invention is to provide a driveshaft locking system which acts as an anti locking system of wheels at certain torque to avoid the skidding of vehicles.
Another object of the present invention is to provide a driveshaft locking system which is actuated only after failure of primary circuit and secondary circuit.
Another object of the present invention is to provide a driveshaft locking system which minimizes the accidents.

Statement of invention
A driveshaft locking system comprises; a brake pedal assembly (01), an engagement fork (02), a disengaging knob (03) operated with the help of said brake pedal assembly (01), a resilient member (04), a metallic insert (05) engaged with pitch of said resilient member (04), a first damper assembly (06) provided for shock absorption and connected to said metallic insert (05), a bell crank lever (08), a push rod (07) to operate said bell crack lever (08), an engine bracket member 09, a second damper assembly (10) on which said bell crank lever (08) is pivoted with the help of said bracket member (09).
The system, in accordance with this invention, wherein said first damper assembly (06) is rubber damper assembly which is rigidly mounted on frame of vehicle.
The system, in accordance with this invention, wherein one end of said push rod (07) is connected to lower end of spring (04) and other end of said push rod (07) is connected to first end of said bell crank lever (08).
The system, in accordance with this invention, wherein said bell crank lever (08) is pivoted at second damper assembly (10) with the help of a bracket member of engine (09).
The system , in accordance with this invention, wherein said engagement fork (02) is connected to second end of said bell crank lever (08) for engaging with locking ring (12) of a driveshaft (13) when said bell crank lever (08) is operated by pressing of brake pedal.

The system, in accordance with this invention, wherein said engagement fork (02) is assembled on ratchet and pawl assembly (15) and said drive shaft (13) is connected to wheel (16) of vehicle.
The system, in accordance with this invention, wherein said driveshaft (13) connected to a transaxle assembly (11) for power transmission to wheels of vehicle.
The system , in accordance with this invention, wherein said driveshaft (13) having ratchet and pawl assembly (15) provided for avoiding complete locking of said driveshaft which prevents the toppling or accident of vehicle.
The system, in accordance with this invention, wherein said ratchet and pawl assembly (15) is mounted on said drive shaft (13) and gear (14) which engages with the said engagement fork (02).
The system, in accordance with this invention, wherein said brake pedal assembly (01) is connected to hydraulic braking System of vehicle having primary brake circuit and secondary brake circuit.
Brief description of Invention:
In accordance with the present invention, driveshaft locking system comprises brake pedal assembly 01, engagement fork 02, disengaging knob 03, resilient member 04, metallic insert 05 to engage with pitch of said resilient member 04, first damper assembly 06 connected to said metallic insert 05, push rod 07, bell crank lever 08, bracket member 09, second clamper assembly 10.

Brief description of drawings:
Figure-01 shows the complete vehicle layout for driveshaft locking system in accordance with the present invention.
Figure-02 shows the detailed construction of driveshaft locking mechanism for a vehicle in accordance with the present invention.
Figure-03 Shows the detailed construction of driveshaft locking and unlocking system.
Detailed description of the 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 and 02, In accordance with the present invention, driveshaft locking system comprises brake pedal assembly 01, engagement fork 02, disengaging knob 03, resilient member 04, metallic insert 05 to engage with pitch of said resilient member 04, first damper assembly 06 connected to said metallic insert 05, push rod 07, bell crank lever 08, bracket member 09, second damper assembly 10.
The said disengaging knob 03 is operated with the help of said brake pedal assembly 01 after the excess brake pedal travel and the said disengaging

knob 03 is disengaged from said resilient means 04 such as compression spring which expands suddenly.
The said metallic insert 05 engages with pitch of said resilient member 04 and restrict the compression of said resilient member 04.
The said metallic insert 05 is connected to said first damper assembly 06, which is rubber damper assembly, for shock absorption. The said rubber damper assembly 06 is rigidly mounted on frame of vehicle. The one end of said push rod 07 is connected to lower end of spring 04 on wheel side and the other end of said push rod 07 is connected to first end of said bell crank lever 08. Bell crank lever 08 is pivoted at second damper assembly 10 provided on engine with the help of bracket member 09. The driveshaft 13 connected to transaxle assembly 11 for power transmission to wheels of vehicle. The said engagement fork 02 is connected to second end of said bell crank lever 08 for engaging with locking ring 12 of said driveshaft 13 when the bell crank lever operates due to pressing of brake pedal.
Now referring to figure-03 which shows the detailed construction of drive shaft locking and unlocking system. The said locking and unlocking system having a ratchet and pawl assembly 15. The said ratchet and pawl assembly 15 is mounted on vehicle drive shaft 13 and gear 14 which engages with the said engagement fork 02. The said engagement fork 02 is assembled on ratchet and pawl assembly 15. The said drive shaft 13 is connected with wheel 16 of vehicle.
When the failure of braking circuit occurs then travel of said brake pedal increases and operate the said disengage knob 03 which expands the said compression spring 04 and said expanded spring is locked by said metallic insert 05. The said push rod 07 pushes the said bell crank lever 08 and said

bell crank lever 08 rotates about the pivot point and pushes the said engagement fork 02 toward said driveshaft 13 of vehicle to engage the said engagement fork 02 with ratchet and pawl assembly 15 provided on said driveshaft 13 for reducing the speed of vehicle. When the critical torque develops then said ratchet and pawl assembly 15 allows the said driveshaft 13 to rotate and resolve the forces. Again when torque reduces further speed reduction occurs and within two or three iterations the vehicle stops. The ratchet and pawl assembly 15 on said driveshaft 13 is provided for avoiding complete locking of said driveshaft which prevents the toppling or accident of vehicle.
When the maximum torque generated by driveshaft 13, engagement of said fork 02 with said driveshaft 13 which enable to operate the ratchet assembly 15 and allow the driveshaft to rotate and resolve the forces. The said brake pedal assembly 01 is connected to hydraulic braking system. The said hydraulic braking system having primary brake circuit and secondary brake circuit. The travel of said brake pedal travel is configured designed by considering the said primary brake circuit and secondary brake circuit. The driveshaft locking occurs after failure of secondary brake circuit. The present invention is effective for sudden stopping of the vehicle at the time of failure of brake system when vehicle is running at high speed. The present invention is configured in such a way that when oil drains from braking system and primary as well as secondary brake circuits is failed, upon brake application by driver, the brake pedal travels to extreme condition and said driveshaft 13 is locked to stop the vehicle. The locking arrangement is provided in such a way that it does not lock the wheel instantaneously. The ratchet and pawl assembly is provided at certain torque for gradually stopping the vehicle and avoid sudden stopping or toppling of the vehicle due to high moment of inertia at high speed.

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. A driveshaft locking system comprises; a brake pedal assembly (01), an engagement fork (02), a disengaging knob (03) operated with the help of said brake pedal assembly (01), a resilient member (04), a metallic insert (05) engaged with pitch of said resilient member (04), a first damper assembly (06) provided for shock absorption and connected to said metallic insert (05), a bell crank lever (08), a push rod (07) to operate said bell crack lever (08), an engine bracket member 09, a second damper assembly (10) on which said bell crank lever (08) is pivoted with the help of said bracket member (09).
2. The system as claimed in claim 1, wherein said first damper assembly
(06) is rubber damper assembly which is rigidly mounted on frame of
vehicle.
3. The system as claimed in claim 1, wherein one end of said push rod
(07) is connected to lower end of spring (04) and other end of said push
rod (07) is connected to first end of said bell crank lever (08).
4. The system as claimed in claim 1, wherein said bell crank lever (08) is pivoted at second damper assembly (10) with the help of a bracket member of engine (09).
5. The system as claimed in claim 1, wherein said engagement fork (02) is connected to second end of said bell crank lever (08) for engaging with locking ring (12) of a driveshaft (13) when said bell crank lever (08) is operated by pressing of brake pedal.

6. The system as claimed in claim 1 and 5, wherein said engagement fork (02) is assembled on ratchet and pawl assembly (15) and said drive shaft (13) is connected to wheel (16) of vehicle.
7. The system as claimed in claim 5, wherein said driveshaft (13) connected to a transaxle assembly (11) for power transmission to wheels of vehicle.
8. The system as claimed in claim 5, wherein said driveshaft (13) having ratchet and pawl assembly (15) provided for avoiding complete locking of said driveshaft which prevents the toppling or accident of vehicle.
9. The system as claimed in claim 8, wherein said ratchet and pawl assembly (15) is mounted on said drive shaft (13) and gear (14) which engages with the said engagement fork (02).
10. The system as claimed in claim 1, wherein said brake pedal
assembly (01) is connected to hydraulic braking system of vehicle
having primary brake circuit and secondary brake circuit.