FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)


TITLE OF THE INVENTION Cab Mountings With Rear Cabin Stopper For Vehicles
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
Pooja Dwivedi and Mahesh Pardeshi
Both are Indian Nationals
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
This invention relates to crash safety system and more particularly it relates to the cab mounting with rear cabin stopper for vehicles.
BACKGROUND OF INVENTION
Modern truck cabins are located at a higher location from the chassis frame. Therefore the cabin to suspension attachments, known as cab mounts, are taller. In event of frontal impact forces, these taller cab mounts are subjected to higher bending moments under the influence of the frontal impact forces, leading to the bending of cab mounts. Depending on their strength the cab mounts will either deform or rupture. Such weak behaviour of the cab mounts results into excessive & uncontrolled cabin deformations and/or displacements against the chassis frame. Such cabin deformations lead to serious bodily injuries to the cabin occupants. Therefore the cab mounts are required to be made stronger to withstand these impact forces. Improving strength of cab mounts involves additional cost, space, weight and loss of standardisation.
Therefore the present invention involves provision of stopper at the rear end of the cabin vertically parallel to the cab mounts. These stopper brackets provide an additional load path to the frontal impact forces and reduce loads on the cab mounts. Therefore it eliminates need for a heavier & costlier cab mounts.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide cab mountings with cabin stopper at the rear end for vehicles to reduce loads on the cab mounts in the event of frotal impacts.


Another objective of the present invention is to provide cab mountings with cabin stopper at the rear end for vehicles to reduce loads on the cab mounts in the event of frotal impacts which is simple in construction and cost effective.
STATEMENT OF INVENTION
Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least one stopper bracket member provided vertically on each chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
Cab mountings with rear cabin stopper for vehicles, in accordance with present invention, wherein said stopper bracket member is provided vertically parallel to rear cab mountings with a predetermined gap between the rear end of said cabin and top of said stopper bracket member such that said stopper bracket member do not interfere with the cabin movement during normal driving conditions.
Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least one vertical stopper bracket member with variable stiffness is provided on chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating variable reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
Cab mountings with rear cabin stopper for vehicles, in accordance with present
3

invention, wherein said stopper bracket member is provided vertically parallel to rear cab mountings with a predetermined gap between the rear end of said cabin and top of said stopper bracket member such that said stopper bracket member do not interfere with the cabin movement during normal driving conditions. Why is it repeated?
Cab mountings with rear cabin stopper for vehicles, in accordance with present invention, wherein said stopper bracket member having variable stiffness such that with increase in displacement of said cabin, the stiffness of said stopper bracket member increases.
Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least at least one mechanical or hydraulic actuator with stopper bracket member provided vertically on chassis frame member behind the said rear cabin mounting means, to activate the said stopper bracket member to be positioned at rear end of said cabin only during the frontal impact forces such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
Cab mountings with rear cabin stopper for vehicles, in accordance with present invention, wherein said stopper bracket member is provided vertically parallel to rear cab mountings with a predetermined gap between the rear end of said cabin and top of said stopper bracket member such that said stopper bracket member do not interfere with the cabin movement during normal driving conditions.


BRIEF DESCRIPTION OF THE INVENTION
In accordance with the present invention,
Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, the front and rear mounting means are attached to the chassis frame of vehicle, stopper bracket member is provided vertically on chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling their deformation during frontal impact.
DETAIL 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.
Figure - 01 shows side view of a truck cabin installed on a chassis frame,
Figure - 02 shows rear end view of rear mountings of a truck cabin,
Figure - 03 shows side view of a truck cabin under the influence of impact forces
from the front,
Figure - 04 shows side view of a truck cabin provided with a stopper bracket in
accordance with this invention,
Figure - 05 shows rear view of a truck cabin provided with a stopper bracket in
accordance with this invention,
Figure - 06 shows side view of a truck cabin provided with a stopper bracket in
accordance with this invention under the influence of impact forces from the front
Now refering to figure-01 to 06, in accordance with present invention,
Cab mountings with rear cabin stopper for vehicles comprises; front (2) and rear (3)
mounting means for mounting cabin (1) , the front and rear mounting means are

attached to the chassis frame (4) of vehicle, stopper bracket member (5) is provided vertically on chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
The truck cabin (1) attached to the chassis frame (4) through front (2) and rear (3) cab mountings.
Stopper bracket members (5) are provided at the rear end of the said cabin in order to control the deformation of said cabin (1). The said auxiliary stopper bracket member (5) is provided vertically parallel to the said rear cab mountings (3). A predetermined gap (6) is maintained between the rear end of the cabin and the top of the said stopper bracket member (5) so that the said stopper bracket member (5) does not interfere with the movement of said cabin (1) during normal driving conditions.
Said stopper bracket member (5) provides an alternate loadpath between the said cabin (1) and said chassis frame (4). Due to the alternate load path, the load on the said cab mounts (2,3) is reduced and their deformation is controlled.
In accorcance with another embodiment of the present invention,
Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least one stopper bracket member with variable stiffness is provided vertically on chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating variably reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact. The stiffness of said stopper bracket member is with variable stiffness depending on the severity of the rear end displacements said

cabin. The stiffness of said bracket member increases with increase in the rear end displacement of the cabin.
In accorcance with yet another embodiment of the present invention, Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least one mechanical or hydraulic actuator with stopper bracket member provided on chassis frame behind the said rear cabin mounting means, to activate the said stopper bracket member to be positioned at rear end of said cabin only during the frontal impact forces such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
The said stopper bracket member with mechanical or hydraulic actuator remains stowed down during normal running conditions of vehicles.
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. Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least one stopper bracket member provic.ed vertically on each chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
2. Cab mountings with rear cabin stopper for vehicles as claimed in claim 1, wherein said stopper bracket member is provided parallel to rear cab mountings with a predetermined gap between the rear end of said cabin and top of said stopper bracket member such that said stopper bracket member

do not interfere

with the cabin movement during normal driving conditions.

3. Cab mountings

with rear cabin stopper for vehicles comprises; front and rear

mounting means for mounting cabin, said front and rear mounting means is

attached to the member with
hassis frame of vehicle, wherein at least one stopper bracket variable stiffness is provided vertically on chassis frame behind the said rear cabin mounting means such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating variably reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
4. Cab mountings with rear cabin stopper for vehicles as claimed in claim 3, wherein said stopper bracket member is provided vertically parallel to rear cab mountings with a predetermined gap between the rear end of said cabin and top of said stopper bracket member such that said stopper bracket

member do not interfere with the cabin movement during normal driving conditions.
5. Cab mountings with rear cabin stopper for vehicles as claimed in claim 3, wherein said stopper bracket member having variable stiffness such that with increase in displacement of said cabin, the stiffness of said stopper bracket member increases.
6. Cab mountings with rear cabin stopper for vehicles comprises; front and rear mounting means for mounting cabin, said front and rear mounting means is attached to the chassis frame of vehicle, wherein at least at least one mechanical or hydraulic actuator with stopper bracket member provided vertically on chassis frame behind the said rear cabin mounting means, to activate the said stopper bracket member to be positioned at rear end of said cabin only during the impact forces such that said stopper bracket member provide an alternate loadpath between the cabin and said chassis frame facilitating reduced load on the said rear cabin mounting means and thereby controlling the deformation during frontal impact.
7. Cab mountings with rear cabin stopper for vehicles substantially as herein described and illustrated with respect to accompanying drawings.