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 chassis frame for automobile 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
Mahesh Mungi
Naidu V G
Maddina Suresh Babu
Indian nationals
of TATA MOTORS LIMITED,
ari Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mtimbai 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.

Improved chassis frame for automobile
Field of invention:
This invention relates to chassis frame and more particularly it relates to improved chassis frame for enhanced occupant protection by improved energy distribution between the cabin and chassis which reduces the deformation of cabin in event of frontal impact on a vehicle.
Background of invention:
Generally the vehicle cabin is mounted on the chassis frame or long members with the help of cab mountings. During the frontal collision, the impact energy is directly taken by the vehicle cabin and relatively less amount of energy is transferred to the chassis frame. The impact force taken directly by vehicle cabin causes the deformation of said vehicle cabin and hazardous to vehicle occupants. Reduction in the interior space is one of the main causes of injuries to the occupants in event of vehicle crash. Optimization of the interior space is usually achieved by appropriate distribution of the impact energy between the chassis frame or long member and cabin of a vehicle.
The present invention is developed to distribute the impact energy between the chassis frame and vehicle cabin appropriately during frontal impact and maximize the interior space to reduce the injuries to occupants of vehicles.
Objects of the invention
The main object of the present invention is to provide an improved chassis frame for automobile.

Another object of the present invention is to provide an improved chassis frame for automobile which transfers significant amount of energy and impact forces to said chassis frame.
Another object of the present invention is to provide an improved chassis frame for automobile which minimizes the deformation of vehicle cabin and maximizes the survival space needed for occupants during the frontal collision of vehicles.
Yet another object of the present invention is to provide an improved chassis frame structure for automobile which is simple in construction and cost effective.
Statement of invention:
An improved chassis frame for automobile comprises; LH long member and RH long member (02), said LH long member and RH long member (02) each having at least one extension member (04), said extension member (04) is connected to said long members in such a manner that during frontal impact said extension member (04) distributes the impact load between said long members and vehicle cabin (01) by providing alternate load path to impact force to absorb energy thereby minimize the deformation of vehicle cabin and maximize survival space for vehicle occupants.
The chassis frame, in accordance with this invention, wherein said extension member (04) is provided at front end of each LH long member and RH long member (02).
The chassis frame , in accordance with this invention, wherein said extension members (04) is rigidly connected to said LH and RH long members (02) at the front end to absorb the energy and develop an alternate load path for impact

forces such that the impact force is distributed between said LH and RH long members (02) and vehicle cabin (01).
The chassis frame , in accordance with this invention, wherein said engagement of said extension member (04) with the rigid barrier (03) during impact facilitates said long members to contribute for energy absorption and minimize the deformation of said cabin (1b) and long members.
The chassis frame , in accordance with this invention, wherein the distribution of impact load between said LH and RH long members (02) and vehicle cabin (01) minimizes the deformation of vehicle cabin (01) and maximizes the survival space needed for occupants during the frontal collision of vehicles.
Brief description of drawings
According to the present invention
Figure - 01 shows side view of a vehicle in accordance with the present
invention,
Figure - 02 shows side view of a vehicle in accordance with the present
invention when impacted by a rigid barrier,
Figure - 03 shows front view of a vehicle in accordance with the present
invention,
Figure - 04 shows the views of the chassis frame in accordance with the present
invention,
Brief description of the invention
In accordance with the present invention, improved chassis frame for automobile comprises; LH long member & RH long member 02, said LH long member and RH long member 02 each having at least one extension member 04 provided at

front end of said long members, said extension member 04 is rigidly connected to said long members in such a manner that during frontal impact said extension member 04 distributes the impact load between said long members and vehicle cabin 01 by providing alternate load path to impact force to absorb energy thereby minimize the deformation of vehicle cabin and maximize survival space for vehicle occupants.
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,
In accordance with the present invention, an improved chassis frame for automobile comprises; LH long member and RH long member 02, said LH long member and RH long member 02 each having at least one extension member 04 provided at front end of said long members, said extension member 04 is rigidly connected to said long members in such a manner that during frontal impact said extension member 04 distributes the impact load between said long members and vehicle cabin 01 by providing alternate load path to impact force to absorb energy thereby minimize the deformation of vehicle cabin and maximize survival space for vehicle occupants.
Referring to figure-01 which shows the side view of the chassis member and vehicle cabin. An extension member 04 is provided at front end of each LH long member and RH long member 02.
Referring to figure-02 which shows behavior of the vehicle structure in accordance with present invention, in the event of frontal impact by a rigid barrier 03. During the frontal impact by said rigid barrier 03, the deformation of cabin 1 b

and long members 2b is minimum after the frontal impact by rigid barrier. The said long members are contributing for the energy absorption due to engagement of the said extension member 04 with the said rigid barrier 03. During the frontal impact with rigid barrier 03, the said extension members 04 which are provided at front end of said long members 02 , comes in contact with the said barrier 03 and enables said long members 02 to contribute for the energy absorption.
The distribution of impact load between said LH and RH long members 02 and vehicle cabin 01 minimizes the deformation of vehicle cabin 01 and also maximizes the survival space needed for occupants during the frontal collision of vehicles.
Referring to figure-03 and 04, Said extension member 04 is rigidly connected to said LH and RH long members 02 at the front end to absorb the energy and develop an alternate load path for impact forces such that the impact force is distributed between said LH and RH long members 02 and vehicle cabin 01 The present invention is simple in construction and cost effective.
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 chassis frame for automobile comprises; LH long member and RH long member (02), said LH long member and RH long member (02) each having at least one extension member (04), said extension member (04) is connected to said long members in such a manner that during frontal impact said extension member (04) distributes the impact load between said long members and vehicle cabin (01) by providing alternate load path to impact force to absorb energy thereby minimize the deformation of vehicle cabin and maximize survival space for vehicle occupants.
2. The chassis frame as claimed in claim 1, wherein said extension member (04) is provided at front end of each LH long member and RH long member (02).
3. The chassis frame as claimed in claim 1, wherein said extension members (04) is rigidly connected to said LH and RH long members (02) at the front end to absorb the energy and develop an alternate load path for impact forces such that the impact force is distributed between said LH and RH long members (02) and vehicle cabin (01).
4. The chassis frame as claimed in claim 1, wherein said engagement of said extension member (04) with the rigid barrier (03) during impact facilitates said long members to contribute for energy absorption and minimize the deformation of said cabin (1b) and long members.
5. The chassis frame as claimed in claim 1, wherein the distribution of impact load between said LH and RH long members (02) and vehicle cabin (01) minimizes the deformation of vehicle cabin (01) and maximizes the survival space needed for occupants during the frontal collision of vehicles.

6. An improved chassis frame for automobile as herein substantially described with reference to accompanying drawings.