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 front cab mounting system for vehicle
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
Dnyaneshwar Mhaskar
Mahesh Mungi
Adwait Kulkarni
All 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:
The present invention is related to cab mountings of a commercial vehicles and more particularly it relates to an improved front cab mounting system for a commercial vehicles to improve its performance under the influence of impact forces.
Background of invention:
Commercial vehicles passenger cabin, known as cab, is mounted to the chassis frame through cab mounts. In the event of an accident, the cabin is exposed to high longitudinal impact forces. Under these forces the cabin structure has a tendency to buckle reducing the survival space required for occupants. Therefore the cabin structure needs to be strong enough to avoid the undesired buckling. In the process, the cab mounts are loaded with higher forces. Ultimately the forces are transferred to their mounting fasteners. The said mounting fasteners are vulnerable for failure under shear forces. Failure of the said fasteners leads to separation of the cab from the chassis frame which results into excessive bodily injuries to the occupants.
Objects of invention:
The main object of the present invention is to provide an improved front cab mounting system for vehicles.
Another object of the present invention is to provide an improved front cab mounting system which reduces the cabin buckling.
Yet another object of the present invention is to provide an improved front cab mounting system which reduces the shear forces on the mounting fasteners of the cab mounts.
Statement of invention
An improved front cab mounting system for vehicle comprises; front cab mounts , rear cab mounts each provided on chassis frame to mount a cabin of a vehicle on said chassis frame, said front cab mounts having a cabin bracket integrally

connected to cab floor long member , a frame mounting bracket provided on chassis frame, an intermediate bracket for connecting said cabin bracket and said frame mounting bracket, said intermediate bracket having plurality of inner ribs and outer ribs, height of at least one of said inner rib is configured in such a way that the gap with said cabin bracket is minimum for supporting said cabin bracket during the impact force thereby mimimising the deformation of the said cabin and buckling of the said floor long member.
An improved front cab mounting system, in accordance with this invention, wherein said cabin bracket is connected to said intermediate bracket with the help of a rubber mount.
An improved front cab mounting system, in accordance with this invention,, wherein said intermediate bracket is an intgral part of said frame mounting bracket or said intermediate bracket is connected to said frame mounting bracket with the help of first set of bolts and said frame mounting bracket is mounted on said chassis frame with the help of second set of bolts.
An improved front cab mounting system for vehicle comprises; front cab mounts, rear cab mounts each provided on chassis frame to mount a cabin of a vehicle on said chassis frame, said front cab mounts having a cabin bracket integrally connected to cab floor long member, a frame mounting bracket provided on chassis frame, an intermediate bracket for connecting said cabin bracket and said frame mounting bracket, said intermediate bracket having plurality of inner ribs and outer ribs extended vertically downward through the top surface oi the said frame mounting bracket such that the longitudinal impact load is shared by said extended ribs thereby preventing the shearing of first set of bolts.
An improved front cab mounting system, in accordance with this invention, wherein either inner ribs or outer ribs are extended vertically downward through the top-surface of the said frame mounting bracket.

An improved front cab mounting system, in accordance with this invention, wherein said frame mounting bracket having a plurality of slots for facilitating insertion of the said extended inner ribs and outer ribs.
An improved front cab mounting system, in accordance with this invention, wherein said extended portion of inner ribs and outer ribs are vertically disposed through the said slots.
An improved front cab mounting system, in accordance with this invention, wherein said cabin bracket is connected to said intermediate bracket with the help of a rubber mount.
An improved front cab mounting system, in accordance with this invention, wherein said intermediate bracket is an intgral part of said frame mounting bracket or said intermediate bracket is connected to said frame mounting bracket with the help of first set of bolts and said frame mounting bracket is mounted on said chassis frame with the help of second set of bolts.
Brief description of drawings:
Figure-01 shows layout of cabin attachment to the chassis frame of a commercial
vehicle.
Figure-02 shows deformation of the cabin under frontal impact forces.
Figure-03 shows isometric view of the front cab mount of a commercial vehicle
Figure-04 shows isometric view of the prior art intermediate bracket,
Figure-05 shows the sectional view of the front cab mounts in accordance with the
first embodiment of the present invention
Figure-06 shows comparative performance of a cab of a commercial vehicle with
improved front cab mounting system in accordance with present invention and
without improved front cab mounting system, under influence of the frontal
impact forces.
Figure-07 shows sectional view of the front cab mounting system in accordance
with the second embodiment of the present invention.

Figure-08 and 09 shows different isometric views of the front cab mounting system in accordance with the second embodiment oi the present invention.
Brief description of invention:
In accordance with the present invention, an improved front cab mounting system for vehicle comprises; front cab mounts (3), rear cab mounts (4), said front cab mount (3) having a cabin bracket (3.1) integrally connected to cab floor long member (1.2), a frame mounting bracket (3.3) provided on chassis frame, an intermediate bracket (3.2) for connecting said cabin bracket (3.1) and said frame mounting bracket (3.3), said intermediate bracket (3.2) having plurality of inner ribs (3.2.1.1, 3.2.1.2, 3.2.1.3) and outer ribs (3.2.2.1, 3.2.2.2), height of at least one said inner ribs is configured in such a way that the gap with said cabin bracket (3.1) is minimum for supporting the said cabin bracket (3.1) during the impact force thereby mimimises the deformation of the said cabin and buckling of the said floor long member (1.2.1).
In accordance with another embodiment, the said inner and outer ribs are extended vertically downward through the top surface of the said frame mounting bracket (3.3) such that the longitudinal impact load is shared by said extended ribs and preventing the shearing of first set of bolts (4.1).
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.
In accordance with first embodient of the present invention, an improved front cab mounting system for vehicle comprises; front cab mounts (3), rear cab mounts (4) each provided on chassis frame (2) to mount a cabin (1) of a vehicle on said chassis frame, said front cab mounts (3) having a cabin bracket (3.1) integrally connected to cab floor long member (1.2), a frame mounting bracket (3.3) provided on chassis frame, an intermediate bracket (3.2) for connecting said cabin bracket (3.1) and said frame mounting bracket (3.3),said intermediate bracket (3.2)

having plurality of inner ribs (3.2.1.1, 3.2.1.2, 3.2.1.3) and outer ribs (3.2.2.1, 3.2.2.2),height of at lease one of the said inner ribs is configured in such a way that the gap with said cabin bracket (3.1) is minimum for supporting the said cabin bracket (3.1) during the impact force thereby mimimises the deformation of the said cabin and buckling of the said floor long member (1.2.1).
Referring to figure-01 which shows a passenger cabin (1) mounted on the chassis
frame (2) with the help of front (3) and rear cab mounts (4) in a commercial
vehicle. The cabin of a vehicle comprises floor long member (1.2). The said cabin
is mounted on chassis frame with the help of a cabin bracket (3.1) of the said front
cab mount (3). The said cabin bracket (3.1) is integral part of the said cab floor
long member (1.2) or said cabin bracket (3.1) is integrally connected to said cab
floor long member (1.2).
Refering to figure-02 which shows deformed shape of said passenger cabin (1.1.1)
under the influence of the frontal impact forces. Under the influence of the frontal
impact forces the said floor long member (1.2.1) acquires the buckled shape.
Refering to figure-03 and 04 which shows details of the front cab mounts. The
front cab mount (3) comprises a cabin bracket (3.1) which is integrally connected
to said cab floor long member (1.2),a frame mounting bracket (3.3) provided on
chassis, member and an intermediate bracket (3.2) for connecting said cabin
bracket (3.1) and said frame mounting bracket (3.3).
The said cabin bracket (3.1) is connected to said intermediate bracket (3.2) with
the help of a rubber mount (3.4).
The said intermediate bracket (3.2) having at least three inner ribs (3.2.1.1, 3.2.1.2,
3.2.1.3) and at least two outer ribs (3.2.2.1,3.2.2.2).
The said intermediate bracket (3.2) is mounted on said frame mounting bracket
(3.3) with the help of first set of bolts (4.1).
The said frame mounting bracket (3.3) is connected to the said chassis frame with
the help of second set of bolts (4.2).

The said intermediate bracket (3.2) can be an integral part of said frame mounting bracket (3,3) or said intermediate bracket (3.2) is connected to the said frame mounting bracket (3.3) with the help of first set of bolts (4.1).
Refering to figure-05, a minimum gap (3.5.1) is maintained between the said cabin bracket (3.1) and the said second inner ribs (3.2.1.2) on the said intermediate bracket (3.2). The said gap (3,5.1) facilitates to support the said cabin bracket (3.1) during the impact force and mimimises the deformation of the said cabin and buckling of the said floor long member (1.2.1).
The height of said second inner rib (3.2.1.2) facilitate to maintain the minimun gap with said cabin bracket (3.1) and does not hinder during the vibrations of the said cabin in normal operations.
Height of any one of said inner ribs can be configured to facilitate a minimum gap between the said cabin bracket (3.1) and the said configured inner ribs to facilitate to support the said cabin bracket (3.1) during the impact force and minimise the deformation of the said cabin and buckling of the said floor long member (1.2.1).
Refering to figure-07 which shows the comparative deformed shape of the cabin with respect to the initial position (1.1.1) and final position (1.1.2) of said from cabin. The initial position (1.1.1) of cabin is shown without the improved front cab mounting system and the final position (1.1.2) of said cabin is shown with the improved front cab mounting in accordance with this invention. The buckling of said floor long member (1.2.1) without the improved front cab mounting system and buckling of said floor member (1.2.2) with improved front cab mounting system under the influence to impact force are shown respectively.
Refering to figure-08, In accordance with second embodiment of the present invention, An improved front cab mounting system for vehicle comprises; front cab mounts (3), rear cab mounts (4) each provided to mount a cabin of a vehicle on said chassis frame, said front cab mounts (3) having a cabin bracket (3.1) integrally connected to cab floor long member (1.2) , a frame mounting bracket

(3.3) provided on chassis member, an intermediate bracket (3.2) for connecting said cabin bracket (3.1) and said frame mounting bracket (3.3), said intermediate bracket (3.2) having plurality of inner ribs (3.2.1.1, 3.2.1.2, 3.2.1.3) and outer ribs (3.2.2.1, 3.2.2.2) extended vertically downward through the top surface of the said frame mounting bracket (3.3) such that the longitudinal impact load is shared by said extended ribs thereby preventing the shearing of first set of bolts (4.1). Said frame mounting bracket (3.3) having a plurality of slots for facilitating insertion of the said extended inner ribs (3.2.1.1, 3.2.1.2, 3.2.1.3 ) and outer ribs (3.2.2.1,3.2.2.).
Said extended portion of inner and outer ribs are vertically disposed through the
said slots.
The said intermediate bracket (3.2) is an integral part of said frame mounting
bracket (3.3) or intermediate bracket (3.2) is connected to the said frame mounting
bracket (3.3) with the help of first set of bolts (4.1).
Depending on the application, any of the said inner ribs (3.2.1.1,3.2.1.2, 3.2.1.3) or
outer ribs (3.2.2.1, 3.2.2.2) can be extended vertically downward through the top
surface of the said frame mounting bracket (3.3) such that the longitudinal impact
load is shared by said extended ribs and preventing the shearing of first set of
bolts (4.1).
The extended portion of said inner and outer ribs facilitates sharing of the shear
forces on the said first set of mounting bolts (4.1) thereby improving the reliability
of the said first and sets of mounting bolts or fasteners.
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 as they come within the scope of the invention as claimed or the equivalents thereof.

We claim
1. An improved front cab mounting system for vehicle comprises; front cab mounts , rear cab mounts each provided on chassis frame to mount a cabin of a vehicle on said chassis frame, said front cab mounts having a cabin bracket integrally connected to cab floor long member , a frame mounting bracket provided on chassis frame, an intermediate bracket for connecting said cabin bracket and said frame mounting bracket , said intermediate bracket having plurality of inner ribs and outer ribs, height of at least one of said inner rib is configured in such a way that the gap with said cabin bracket is minimum for supporting said cabin bracket during the impact force thereby mimimising the deformation of the said cabin and buckling of the said floor long member.
2. An improved front cab mounting system as claimed in claim 1, wherein said cabin bracket is connected to said intermediate bracket with the help of a rubber mount.
3. An improved front cab mounting system as claimed in claim 1, wherein said intermediate bracket is an intgral part of said frame mounting bracket or said intermediate bracket is connected to said frame mounting bracket with the help of first set of bolts and said frame mounting bracket is mounted on said chassis frame with the help of second set of bolts.
4. An improved front cab mounting system for vehicle comprises; front cab mounts, rear cab mounts each provided on chassis frame to mount a cabin of a vehicle on said chassis frame, said front cab mounts having a cabin bracket integrally connected to cab floor long member, a frame mounting bracket provided on chassis frame, an intermediate bracket for connecting said cabin bracket and said frame mounting bracket, said intermediate bracket having plurality of inner ribs and outer ribs extended vertically downward through the top surface of the said frame mounting bracket such that the longitudinal impact load is shared by said extended ribs thereby preventing the shearing of first set of bolts.

5. An improved front cab mounting system as claimed in claim 4, wherein either inner ribs or outer ribs are extended vertically downward through the top surface of the said frame mounting bracket.
6. An improved front cab mounting system as claimed in claim 4, wherein said frame mounting bracket having a plurality of slots tor facilitating insertion of the said extended inner ribs and outer ribs.
7. An improved front cab mounting system as claimed in claim 4, wherein said extended portion of inner ribs and outer ribs are vertically disposed through the said slots.
8. An improved front cab mounting system as claimed in claim 4, wherein said cabin bracket is connected1 to said intermediate; bracket with the help of a rubber mount.
9. An improved front cab mounting system as claimed in claim 4, wherein said intermediate bracket is an intgral part of said frame mounting bracket or said intermediate bracket is connected to said frame; mounting bracket with the help of first set of bolts and said frame mounting bracket is mounted on said chassis frame with the help of second set of bolts.
10. An improved front cab mounting system for vehicle as herein described with reference to accompanying drawings.