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THE PATENTS ACT 1970
/39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)
A CAB MOUNTING SYSTEM WITH INTEGRATED ENERGY ABSORBER
APPLICANT/S
TATA MOTORS LIMITED
an Indian company
having its registered office at
Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India
INVENTOR/S
MISHRA ABHIJIT ATRE MANDAR KOMAR SANJU
GANGANI BHAVESH P
an 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 nature of invention and the manner in which it is to be performed.

FIELD OF INVENTION
The present invention relates to cab mounting structure for vehicles and more particularly to cab mounting system with front mounting bracket to absorb the impact energy during frontal impact of the vehicles.
BACKGROUND OF INVENTION
In commercial vehicles the driver and crew are accommodated in an enclosure called cab of the vehicle. The cab of the vehicle is mounted on vehicle chassis frame with the help of mounting brackets. The mounting brackets are categorized in to mainly two parts i.e. front mounting bracket and rear mounting bracket depending upon their position with respect to the occupant. The cab mounts are required to ensure attachment of the cab with the chassis frame in all possible load cases. During frontal impact of vehicles, the front mounting brackets has the tendency to displace against the chassis frame resulting in separation of the cab from chassis. The additional function of the cab mounts is to hold the cab in its original location with respect to chassis frame to maintain occupant safety in the event of vehicle frontal impact.
Absorption of energy during frontal impact is the challenging task ahead of all the vehicle manufactures. The vehicle manufacturers are providing separate crash zones to address the occupant safety at the substantial cost. The previously designed cab mounts are made stiff to meet the durability targets. However such mounts are poor in energy absorption at the event of crash. Due to the stiff structure of the mounts they are deformed easily by the huge load application at frontal impact. After deformation of the cab mounts it is difficult for the cab to remain in its original position with respect to the chassis frame. Such cab mounts reduces the safety of the occupants. More over, in earlier cab mounting structure a special crash element is provided which is not an integral part of front mounting bracket. The crash element is to be assembled with the front mounting bracket through a locating pin which is time

consuming. Also the addition of crash element and locating pin in front mounting bracket results in high manufacturing cost and increases the weight of the component.
OBJECTS OF THE INVENTION
The primary object of the present invention is to provide a cab mounting system with integrated energy absorber to absorb the impact energy during frontal impact of the vehicles,
Another object of the present invention is to provide a cab mounting system which prevents the detachment of the cab mounting system from the chassis frame during frontal impact of the vehicle and to ensure safety of the occupants inside the cab.
Yet another object of the present invention is to provide a cab mounting system which is a low cost and light weight cab mounting system.
STATEMENT OF INVENTION
A cab mounting system comprises; a cover plate 4.7 mounted on chassis frame, an intermediate plate 4.11 provided for supporting to said cover plate, a lower bracket 5 and a cab side bracket 4.3 are connected to said intermediate plate 4.11, a tubular member 4.1 is connected to said intermediate plate 4.11 and said lower bracket 5, upper end and lower end of said cab side bracket 4.3 is connected to said tubular member 4.1 and chassis frame 2 respectively, said lower bracket 5 includes a wrap around portion 4.4 adapted to wrap around with the bottom face of said cover plate 4.7.
The system, in accordance with this invention, wherein said cover plate 4.7 and intermediate plate 4.11 are collapsible.

The system, in accordance with this invention, wherein said cover plate 4.7 and intermediate plate 4.11 comprises cuts or slots section to initiate the deformation in the event of frontal impact of vehicles.
The system, in accordance with this invention, wherein said intermediate plate 4.11 comprises a rib 4.2 on either side provided for supporting said intermediate plate.
The system, in accordance with this invention, wherein said rib 4.2 projects vertically upright on inner and outer side of said intermediate plate.
The system, in accordance with this invention, wherein said rib 4.2 on outer side comprises an adjuster bracket 4.12 provided for mounting adjuster bolt to apply torque in torsion bar for tiltable cab of the vehicle.
BRIEF DESCRIPTION ON INVENTION
The embodiments herein provide a cab mounting system with integrated energy absorber for vehicles to absorb the impact energy during frontal impact of the vehicles. The cab mounting system comprises a cover plate connected to an intermediate plate to form a rear mounting system. A tubular member and a cab side bracket are connected to said intermediate plate. Upper end of said cab side bracket is connected to said tubular member and lower end is connected to a chassis frame. A lower bracket connected to said chassis frame. The lower bracket includes a wrap around portion at top end adapted to wrap around with the bottom face of said upper bracket to form a single cab mounting system. Said intermediate plate and cover plate comprises cuts and slots provided to initiate deformation at the event of frontal impact of vehicles. Said intermediate plate comprises a rib welded vertically to provide support to the said plate. The rib are provided on inner and outer side of said

intermediate plate. Said ribs projects vertically perpendicular. Said outer side rib comprises an adjuster bracket provided for mounting adjuster bolt and to apply torque in torsion bar and to tilt the cab of the vehicle. The tubular member and cab side bracket is located on the front side of the chassis frame to support the vehicle cabin. Said tubular member houses the torsion bar connecting the cab mounting system on the chassis long members. The cover plate and intermediate plate provides the structural stability to the cab during the normal operation and acts as the energy absorption member during the vehicle frontal impact.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a perspective view of a cab mounting system with front mounting brackets mounted on chassis frame, according to present invention. FIG. 2 and 3 shows a left and right side perspective view of a cab mounting system mounted on the left chassis frame, according to present invention. The cab mounting system mounted on the right chassis frame is mirror opposite to that of the mounting system mounted on left chassis frame. FIG. 4 shows an exploded view of the cab mounting system, according to present invention.
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,
Referring to the FIG. 1, the cab mounting system 3 is mounted on the chassis frame 2 to hold the cab 1, according to present invention. A cab mounting system comprises; a cover plate 4.7 mounted on chassis frame, an intermediate plate 4.11 provided for supporting to said cover plate, a lower bracket 5 and a cab side bracket 4.3 are connected to said intermediate

plate 4.11, a tubular member 4.1 is connected to said intermediate plate 4.11 and said lower bracket 5, upper end and lower end of said cab side bracket 4.3 is connected to said tubular member 4.1 and chassis frame 2 respectively, said lower bracket 5 includes a wrap around portion 4.4 adapted to wrap around with the bottom face of said cover plate 4.7.
According to present invention, a cuts and slots are provided in the intermediate plate 4.11 and cover plate 4.7 to initiate the deformation so that it can be easily deformed at the event of frontal impact of vehicles. A rib 4.2 is welded vertically to the intermediate plate 4.11 to give additional support to the intermediate plate 4.11. The rib 4.2 projects vertically perpendicular on inner and outer side of said intermediate plate 4.11.
The rib 4.2 provided on outer side comprises an adjuster bracket 4.12 provided for mounting the adjuster bolt and apply torque in torsion bar to tilt the cab of the vehicle.
The said tubular member 4.1, cab side bracket 4.3 is provided on the front side of the chassis frame to support the vehicle cabin. Said tubular member 4.1 houses the torsion bar connecting the cab mounting system on the chassis long members.
The said cover plate 4.7, intermediate plate 4.11 provides the structural stability to said cab mounting system during the normal operation and constitute the energy absorption member for absorbing impact energy during frontal collision.
Referring to the FIG. 2, Tubular member 4.1, said rib 4.2, cab side bracket 4.3, wrap around portion 4.4 of said lower bracket 5, said cover plate 4.7 and intermediate plate 4.11 are connected together, preferably by arc welding, to form a solid structure.

Said tubular member 4.1, said rib 4.2, cab side bracket 4.3, wrap around portion 4.4 of said lower bracket 5 are connected together to hold the said cab 1 safely with respect to chassis frame 2 and prevent deformation at the time of frontal crash.
The cover plate 4.7 and intermediate plate 4.11 having cuts and slots which enables to initiate the deformation of said plates easily in the event of frontal crash of vehicle. Due to this deformation the total energy created at the time of frontal crash can be easily absorbed with the help of integrated energy absorber and preventing the damage of said tubular member 4.1 and cab side bracket 4.3 and detachment of the said cab 1 .
The mounting brackets are made of sheet metal components having varying thickness.
The front tube 4.1 is connected to the intermediate plate 4.11 as well as to the cab side bracket through arc welding. The said cab side bracket 4.3 is connected to lower bracket 5, wrap around portion 4.4 of said lower bracket and intermediate plate 4.11 by arc welding.
The tubular member 4.1 and cab side bracket 4.3 are the most critical members which are severely impacted in the event of frontal crash, hence the joinery or connection of said tubular member and cab side bracket should be stronger.
The intermediate plate (4.11) is welded to the front tube. (4.1), the cab side bracket (4.3), and the wrap around portion (4.4). The intermediate plate (4.11) and the cover plate (4.7) are connected with each other by arc welding.

The intermediate plate (4.11) comprises rib (4.2) on outer and inner side provided for supporting to said plate. Said rib (4.2) is welded vertically to the intermediate plate (4.11).
The rib provided on outer side comprises an adjuster bracket (4.12) provided for mounting the adjuster bolt and apply torque in torsion bar to tilt the cab of the vehicle.
The said adjuster bracket (4.12) is provided for mounting adjuster bolt and tightened to apply torque in the torsion bar. The tightening of said adjuster bolts on both chassis member, the torque is created on the torsion bar.
The wrap around portion (4.4) having two holes provided for mounting on the top of the chassis frame (2). Out of these two holes, one hole is used to mount the said lower bracket (5) on the chassis top surface by bolt (4.5) and the other hole is used as a clearance hole.
The cover plate (4.7) having holes provided for mounting to chassis frame using bolts (4.8, 4.9 and 4.10). The mounting plate ( 5) having holes provided at lower end for mounting to the chassis frame using bolts (5.1, 5.2 and 5.3).
The cover plate (4.7) having cut-outs provided to initiate the deformation during frontal collision. The intermediate plate (4.11) having slots and cut-outs provided to facilitate the deformation during frontal collision. The lower bracket (5) is mounted to the chassis frame (2) using bolts (5.1, 5.2 and 5.3), as shown in FIG. 3. The lower bracket (5) of the front cab mounting system is assembled to the chassis frame (2) on side face. The holes provided on said lower bracket 5 are used to bolt with chassis by M12 bolts.
The one hole provided on wrap around portion (4.4) and the holes provided on the cover plate are bolted on the chassis top surface by bolts (4.8, 4.9 and 4.10). Hence the present invention provides an improved cab mounting

system which absorbs the energy in the event of frontal crash of the vehicle by using energy absorber. FIG. 4 shows an exploded view of the cab mounting system, according to present invention.
In the event of front crash of vehicles, the cabin structure is impacted against colliding barrier which generates forces on the said cab side bracket and tubular member. These forces are transferred \o the chassis frame 2 with the help of said cab mounting system.
ADVANTAGES
• A cab mounting system with integrated energy absorber is provided to absorb the impact energy at the event of frontal crash of vehicle and avoids the cab of the vehicle form getting detached from the chassis.
• The energy absorbing members with slots and cut are provided to initiate the deformation at the event of frontal crash.
• The present invention provides a tow cost and light weight cab mounting bracket.
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 cab mounting system comprises; a cover plate (4.7) mounted on chassis frame, an intermediate piate (4.11) provided for supporting to said cover plate, a lower bracket (5) and a cab side bracket (4.3) are connected to said intermediate plate (4.11), a tubular member (4.1) is connected to said intermediate plate (4.11) and said lower bracket (5), upper end and lower end of said cab side bracket (4.3) are connected to said tubular member (4.1) and chassis frame (2) respectively, said lower bracket (5) includes a wrap around portion (4.4) adapted to wrap around with the bottom face of said cover plate (4.7).
2. The system as claimed in claim 1, wherein said cover plate (4.7) and intermediate plate (4.11) are collapsible.
3. The system as claimed in claim 1, wherein said cover plate (4.7) and intermediate plate (4.11) comprises cuts or slots section to initiate the deformation in the event of frontal impact of vehicles.
4. The system as claimed in claim 1, wherein said intermediate plate (4.11) comprises a rib (4.2) on either side provided for supporting said intermediate plate.
5. The system as claimed in claim 1, wherein said rib (4.2) projects vertically upright on inner and outer side of said intermediate plate.
6. The system as claimed in claim 1, wherein said rib (4.2) on outer side comprises an adjuster bracket (4.12) provided for mounting adjuster bolt to apply torque in torsion bar for tiltable cab of the vehicle.

7. The system according to claim 1, wherein cab mounting system as herein described substantially with reference to accompanying drawings.