FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: “A REMOTELY UNLOCKING SYSTEM FOR CAB STAY IN MANUALLY TILTABLE CABS AND METHOD OF ASSEMBLING THE SAME”
Name of the Applicant: TATA MOTORS LIMITED
Address: Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA
Nationality: INDIAN
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The disclosure relates to safe unlocking of cab stay system in commercial vehicles from tilted cabin condition to horizontal position through remote cable operation.
BACKGROUND AND PRIOR ART
In commercial vehicles the driver and crew are accommodated in to an enclosure called cabin of the vehicle. Light commercial vehicles with manually tilt-able cabins have fully forward type control design with engine location just below passenger seats. For the ease of serviceability and access of engine and peripherals, cabs are made tilt-able. The existing cab stay is manually tilt-able light commercial vehicles cabin which is retained in tilted condition with the help of the cab stay assembly. To bring down the cabin to its normal running condition cab stay should be unlocked manually. As the operating point of unlocking the cab stay lies in the zone of rapidly approaching cabin the manual unlocking operation becomes unsafe.
The cabin of the vehicle is mounted on chassis with the help of mounting brackets. The said mounting brackets are categorized mainly in two parts i.e. front mounting bracket and rear mounting bracket depending upon their position with respect to the occupant. For the ease of cab tilting and dropping, torsion bar arrangement is accompanied with front mounting. In the completely tilted condition torsion bar goes to its neutral position. At this stage, cabin is retained in tilted position with the help of cab stay assembly.
Wherever the adequate reach is available, the cab stay can be operated comfortably. But in case there is a crunch of space for the operator to stand and execute the cab stay unlocking the operation becomes cumbersome. The location of cab stay assembly with respect to front axle in vehicle longitudinal and lateral direction is the decisive factors in the cab stay reach. If this distance is excessive, then after completing the operation the operator will end up stranded below the rapidly approaching cabin which results in unsafe working condition.
Existing cab stay and its assembly in the vehicle consisting of tilt-able cab is shown in FIGS. 1 and 2. During tilting, cab stay starts unfolding and locking lever gets locked

against a locking plate which keeps the cab stay in unfolded condition unless and until locking lever is unlocked. After finishing work at the engine of the vehicle, to bring the cab to a horizontal position, operator has to follow the two steps. Firstly, pressing unlocking lever and pulling bottom channel to initiate cab dropping. Due to self weight of the cab, dropping action continues till the cab comes to the horizontal position.
STATEMENT OF THE DISCLOSURE
Accordingly the present disclosure provides for a remotely unlocking system (1) for cab stay for unlocking cab (2) of vehicle (5) from unfold condition, said system comprising at least one cab stay (3) along with unlocking lever assembly (11) connected onto chassis frame (4) of the vehicle (5) at front portion; at least one operating lever assembly (6) connected to rear mounting (7); and at least one cable (8) routed through the chassis frame (4) connected between the cab stay (3) and the operating lever assembly (6), wherein said cable (8) is dragged by pulling the operating lever assembly (6) for remotely unlocking the cab stay (3) from unfold condition; also provides for a method for remotely unlocking cab of vehicle (5) from unfold condition, said method comprising acts of unlocking operating end lever (17) by pulling safety locking lever assembly (20); and pulling the unlocked operating end lever (17) to drag cable (8) connected between the operating end lever (17) and locking lever (15) for unlocking cab stay (3) from unfold condition; and also provides for a method of assembling of a system for unlocking cab (2) of vehicle (5) from unfold condition, said method comprising acts of connecting at least one cab stay (3) onto chassis frame (4) of the vehicle (5) at front portion; connecting at least one operating lever assembly (6) to rear mounting (7); and connecting at least one cable (8) between the cab stay (3) and the operating lever assembly (6) and routing the cable (8) through the chassis frame (4).
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the

accompanying figures. One or more embodiments are now described, by way of example
only, with reference to the accompanying drawings wherein like reference numerals
represent like elements and in which:
FIG. 1 shows side view of a vehicle consisting cab and the chassis frame with front
mounting bracket assembly including torsion bar, rear mounting bracket assembly and
the cab stay arrangement according to prior art.
FIG. 2 shows side view of the vehicle with cab in titled condition and cab stay in
unfolded condition according to prior art.
FIGS. 3 and 4 shows side views of the vehicle with the cab in tilted condition and remote
cab stay assembly which includes remote unlocking system with cable arrangement
according to present disclosure.
FIG. 5 shows perspective view of remote unlocking system with cable arrangement and
operating end lever with safety lock according to present disclosure.
FIG. 6 shows exploded view ‘A’ of remote unlocking system according to present
disclosure,
FIG. 7 shows exploded view ‘B’ of operating end lever and safety lock according to
present disclosure, and
FIGS. 8a and 8b shows operational stages of cab stay remote unlocking operation through
cable arrangement according to present disclosure.
DETAILED DESCRIPTION
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, and drawings are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and make part of this disclosure.

Referral Numerals:
1: Remotely unlocking system
2: Cab,
3: Cab stay,
4: Chassis frame,
5: Vehicle,
6: Operating lever assembly,
7: Rear mounting,
8: Cable,
9: Top channel,
10: Bottom channel,
11: Unlocking lever assembly,
12, 13: Bracket assembly,
14: Hexagonal pin,
15: Lever,
16: Plate,
16a: Clamping plate,
17: Operating end lever,
18: Step pin,
19, 28, 30: Pin,
20: Safety lever locking assembly,
21, 25: Locking lever,
22: Locking pin,
23: Spring,
24, 31: Brackets,
24a: Clamp arrangement,
26: Stopper,
27: Sleeve,
29: Torsion bar arrangement, and
32: Spacer.

The present disclosure is in relation to a remotely unlocking system (1) for cab stay for unlocking cab (2) of vehicle (5) from unfold condition, said system comprising at least one cab stay (3) along with unlocking lever assembly (11) connected onto chassis frame (4) of the vehicle (5) at front portion; at least one operating lever assembly (6) connected to rear mounting (7); and at least one cable (8) routed through the chassis frame (4) connected between the cab stay (3) and the operating lever assembly (6), wherein said cable (8) is dragged by pulling the operating lever assembly (6) for remotely unlocking the cab stay (3) from unfold condition.
In one embodiment of the present disclosure, the cab stay (3) comprises locking lever (25) connected to a top channel (9), a bottom channel (10) with a stopper (26), and a locking lever assembly (11) rotatably connected to the top channel (9).
In one embodiment of the present disclosure, the top (9) and the bottom (10) channels are pinned to bracket assemblies (12, 13) at cab side and chassis frame side respectively and are hinged to each other.
In one embodiment of the present disclosure, the unlocking lever assembly (11) is joined with a hexagonal pin (14) through a sleeve (27) and lever (15) connecting to the cable (8).
In one embodiment of the present disclosure, the operating lever assembly (6) located outside of cab dropping area comprises a plate (16) connected onto the rear mounting (7), an operating end lever (17) pivotably connected to the plate (16) through pin (19), and said operating end lever (17) is held with a safety locking lever assembly (20) using a spring (23), and said safety locking lever assembly (20) consists of a lever (21) and a locking pin (22) pivotably connected to the plate (16).
In one embodiment of the present disclosure, the cable (8) is guided and supported by plurality of brackets (24) mounted onto the chassis frame (4).
The present disclosure also relating to a method for remotely unlocking cab of vehicle (5) from unfold condition, said method comprising acts of unlocking operating end lever (17)

by pulling safety locking lever assembly (20); and pulling the unlocked operating end lever (17) to drag cable (8) connected between the operating end lever (17) and locking lever (15) for unlocking cab stay (3) from unfold condition.
In one embodiment of the present disclosure, the dragging of cable (8) results in pulling of bottom channel (10) to initiate cab (2) dropping.
The present disclosure also relating to a method of assembling a system for unlocking cab (2) of vehicle (5) from unfold condition, said method comprising acts of connecting at least one cab stay (3) onto chassis frame (4) of the vehicle (5) at front portion; connecting at least one operating lever assembly (6) to rear mounting (7); and connecting at least one cable (8) between the cab stay (3) and the operating lever assembly (6) and routing the cable (8) through the chassis frame (4).
The primary objective of the disclosure is to provide for a system (1) to unlock and fold the cab stay (3) to bring tilted cab (2) to normal vehicle (5) running position (horizontal position) through the cable (8) operated mechanisms. As the operating point is outside of cab (2) periphery (cab dropping zone), it provides safe operation of the unlocking of cab stay (3).
FIGS. 3 and 4 shows side views of the vehicle with the cab in tilted condition and remote cab stay assembly which includes remote unlocking system with cable arrangement according to present disclosure. The cab (2) is mounted and supported at two points on the chassis frame (4). One point is at front of the vehicle (5) through a front mounting with torsion bar arrangement (29) and other is towards rear end of the vehicle (5) through a rear mounting (7). A cab stay (3) is provided to retain the cab (2) in tilted condition to a particular angle for the purpose of serviceability of engine and other parts being located below the cab (2).
The cab stay (3) comprises a top channel (9) pinned to a bottom channel (10) to which locking/clamping plate (16a) is welded. A locking lever (25) is pinned to the top channel (9). The assembled top (9) and bottom channels (10) are pinned to a bracket assembly (12) at cab side and a bracket assembly (13) at chassis side respectively. The assembly of

complete cab stay (3) is bolted to the cab (2) and the chassis frame (4). The bracket assemblies (12, 13) consists sheet metal components having thickness varying from 2 mm to 3.15 mm. The bracket assemblies (12, 13) are welded onto the chassis using arc welding.
FIG.5 illustrates perspective view of remote unlocking system with cable arrangement and operating end lever with safety lock according to present disclosure. The remote unlocking system (1) comprises sub systems such as cab stay (2) with remote unlocking lever assembly (11), cable (8) arrangement, and an operating lever assembly (6). The cable (8) is routed on the chassis frame (4) through brackets (24) and clamp arrangement (24a). One end of the cable (8) is pinned to the remote unlocking lever (15) of the remote unlocking system (1) through pin (28) and other end is pinned to the operating end lever (17) of the operating lever assembly (6) through a pin (30).
FIG. 6 illustrates exploded view of portion of remote unlocking system as indicated by ‘A’ in FIG 5 according to the present disclosure. The remote unlocking lever assembly (11) is a welded assembly consists of hexagonal pin (14), a sleeve (27), and a lever (15). To incorporate remote unlocking lever assembly (11) a pin hole on the top channel (9) is modified. A hexagonal slot is created on the lever (25). A stopper (26) is welded to the bottom channel (10).
FIG. 7 shows exploded view of portion of remote unlocking system indicated by ‘B’ in FIG 5. The exploded portion ‘B’ comprises operating end lever (17) and safety lock according to the present disclosure. The operating lever assembly (6) comprises operating end lever (17) pinned to a plate (16) through pin (19), safety locking lever assembly (20) in which locking lever (21), locking pin (22) and step pin (18) are welded to each other. The operating lever assembly (6) is torsion spring loaded and also pinned to the plate (16) using a spring (23). One end of the torsion spring (23) is clamped to the locking lever (21) and other end is clamped to a clamping plate (16a). The clamping plate (16a) and spacer (32) are welded to the plate (16). The whole assembly of the operating lever assembly (6) is mounted on the rear mounting (7) through a bracket (31).

Operating the remote unlocking system:
FIGS 8a and 8b illustrates operational stages of cab stay remote unlocking system through the cable (8) arrangement according to the present disclosure. The behavior of the cab stay (3) during cab (2) tilting and dropping is same as existing cab stay. The difference is lies in the fact that the operator needn’t to reach to the cab stay (8) for unlocking. The operator has to operate operating end lever (17) which is located out side of cab (2) dropping zone.
At operating end, the operator has to operate first safety lever locking assembly (20) to unlock operating end lever (17). After that, the operator has to pull operating end lever (17) which results in pulling action through cable (8) further resulting in unlocking of lever (15) at the cab stay (3) end. Due to restriction provided by the stopper (26) to movement of the lever (15), further pulling of the lever (15) by the cable (8) results in pulling of the bottom channel (10) initiating the cab (2) to drop from unfold condition. Further dropping of the cab (2) continues due to self weight of the cab (2). After initiation of the cab (2) dropping, the operator releases the operating end lever (17) which retracts to its normal/original condition due to tension spring provided at cab stay (3) end. During returning of the operating end lever (17) slam latching with safety lock pin take place.
Advantages and Industrial Applicability:
The remote unlocking system ensures operator safety during dropping of the tilted cab.
The remote unlocking system is operated easily as location of the operating point is out side of the cab periphery.
The disclosed remote unlocking system finds potential application in vehicles more specifically in tiltable cabined vehicles. One skilled in the art will recognize, however, that the disclosed remote unlocking system could be utilized in relation to other unlocking systems that may or may not be associated with tiltable cabined vehicles. For example, the disclosed remote unlocking system could be utilized in relation to closing of doors/openings in boilers or furnaces systems.

The said system has been described in connection with its preferred embodiments. However, it is not limited thereto. Changes, variations and modifications to the basic design may be made without departing from the inventive concepts in this invention. In addition, these changes, variations and modifications would be obvious to those skilled in the art having the benefit of the foregoing teachings. All such changes, variations and modifications are intended to be within the scope of this invention. The technology of the instant Application explained with the examples should not be construed to limit the scope of the invention.

We claim:
1. A remotely unlocking system (1) for cab stay for unlocking cab (2) of vehicle (5)
from unfold condition, said system comprising:
at least one cab stay (3) along with unlocking lever assembly (11) connected onto
chassis frame (4) of the vehicle (5) at front portion; at least one operating lever assembly (6) connected to rear mounting (7); and at least one cable (8) routed through the chassis frame (4) connected between the
cab stay (3) and the operating lever assembly (6), wherein said cable (8) is dragged by
pulling the operating lever assembly (6) for remotely unlocking the cab stay (3) from
unfold condition.
2. The system as claimed in claim 1, wherein the cab stay (3) comprises locking lever (25) connected to a top channel (9), a bottom channel (10) with a stopper (26), and a locking lever assembly (11) rotatably connected to the top channel (9).
3. The system as claimed in claim 2, wherein the top (9) and the bottom (10) channels are pinned to bracket assemblies (12, 13) at cab side and chassis frame side respectively and are hinged to each other.
4. The system as claimed in claim 2, wherein the unlocking lever assembly (11) is joined with a hexagonal pin (14) through a sleeve (27) and lever (15) connecting to the cable (8).
5. The system as claimed in claim 1, wherein the operating lever assembly (6) located outside of cab dropping area comprises:
a plate (16) connected onto the rear mounting (7),
an operating end lever (17) pivotably connected to the plate (16) through pin (19), and said operating end lever (17) is held with a safety locking lever assembly (20) using a spring (23), and
said safety locking lever assembly (20) consists of a lever (21) and a locking pin (22) pivotably connected to the plate (16).

6. The system as claimed in claim 1, wherein the cable (8) is guided and supported by plurality of brackets (24) mounted onto the chassis frame (4).
7. A method for remotely unlocking cab of vehicle (5) from unfold condition, said method comprising acts of:
unlocking operating end lever (17) by pulling safety locking lever assembly (20);
and
pulling the unlocked operating end lever (17) to drag cable (8) connected between the operating end lever (17) and locking lever (15) for unlocking cab stay (3) from unfold condition.
8. The method as claimed in claim 7, wherein the dragging of cable (8) results in pulling of bottom channel (10) to initiate cab (2) dropping.
9. A method of assembling of a system for unlocking cab (2) of vehicle (5) from unfold condition, said method comprising acts of:
connecting at least one cab stay (3) onto chassis frame (4) of the vehicle (5) at
front portion; connecting at least one operating lever assembly (6) to rear mounting (7); and connecting at least one cable (8) between the cab stay (3) and the operating lever
assembly (6) and routing the cable (8) through the chassis frame (4).
10. A remotely unlocking system (1), a method for remotely unlocking cab of vehicle (5)
from unfold condition, and a method of assembling a system for unlocking cab (2) of
vehicle (5) from unfold condition are substantially as herein above described and as
illustrated in accompanying drawings.