FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10; rule 13]
TITLE: “A MECHANISM FOR A TILTABLE HEADREST AND A SEAT ASSEMBLY
FOR A VEHICLE THEREOF”
Name and Address of the Applicant:
TATA MOTORS PASSENGER VEHICLES LIMITED; an Indian company having a registered address at Floor 3, 4, Plot-18, Nanavati Mahalaya, Mudhana Shetty Marg, BSE, Fort, Mumbai, Mumbai City, Maharashtra, 400001, India.
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
Present disclosure, in general, relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to a seat assembly of a vehicle. Further, embodiments of the present disclosure relate to a tiltable headrest for the seat assembly and a mechanism for tilting the headrest.
BACKGROUND OF THE DISCLOSURE
In general, a seat assembly in a vehicle is required to allow an occupant to rest in an ergonomic sitting position. The seat assembly in general, is configured to accommodate and support the occupant during travel and/or sitting in the vehicle. Multiple seat assemblies are incorporated in passenger vehicles, such as buses, planes, cars, trains and the like, to carry the occupants.
Conventionally, the seat assembly includes a seat, a backrest and a headrest. The seat supports lower body portion of the occupant, the backrest supports torso and the headrest supports head of the occupant and aids to maintain sitting posture. The backrest, the seat and the headrest are adjustable based on physique of the occupant. In the vehicles, position of the seat assembly, inclination of the backrest relative to the seat, and height of the headrest are adjustable to accommodate different occupants.
Existing seat assemblies are generally not adjustable to support the head and neck of the occupant sufficiently. There may exist a gap between the head and the headrest, such as when the head of the driver is at a substantially upright position. The presence of the gap may cause inconvenience to the occupant and may affect sitting posture of the occupant. Minimizing the gap between the head of the occupant and the headrest is crucial to avoid discomfort to the occupant and also to avoid whiplash during crash of the vehicle. With advancement of technology, efforts have been made to address the shortcomings and tilt the headrest by different mechanisms and support head of the occupant. However, such mechanisms involve complex components making the headrests bulky.
The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the conventional mechanisms.

SUMMARY OF THE DISCLOSURE
One or more shortcomings of the prior art are overcome by a method and a system as claimed and additional advantages are provided through the method and the system as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In one non-limiting embodiment of the present disclosure a mechanism for a tiltable headrest is disclosed. The mechanism comprises a connecting rod, a rotatable member and at least one plunger. The connecting rod is to be positioned across a plurality of rods of a seat assembly. The rotatable member is rotatably disposed on the connecting rod and the headrest is to be mounted on the rotatable member. The at least one plunger is configured to selectively engage with at least a portion of the rotatable member to arrest rotation of the rotatable member. The at least one plunger is configured to disengage from the portion of the rotatable member to allow rotation of rotatable member, where the rotation allows tilting of the headrest.
In an embodiment, the rotatable member is defined with a plurality of engaging portions defined on a face of the rotatable member, each engaging portion of the plurality of engaging members being configured to receive and secure the at least one plunger.
In an embodiment, the at least one plunger is configured to engage and disengage with the plurality of engaging portions to selectively allow tilting of the headrest and lock the headrest at a tilted position respectively.
In an embodiment, the mechanism comprises one or more guide members mounted on the connecting rod, where the one or more guide members are configured to receive the at least one plunger and guide the at least one plunger to move relative to the rotatable member.
In an embodiment, the mechanism comprises a protrusion defined proximal to a first end of the at least one plunger to engage with the rotatable member, the first end being defined between the rotatable member and the one or more guide members.
In an embodiment, the at least one plunger is defined with a knob on a second end defined opposite to the first end and configured to extend outside of the headrest, the knob being actuatable to actuate the at least one plunger.

In an embodiment, the mechanism comprises at least one resilient member positioned between the one or more guide members and surrounding the at least one plunger, to bias the at least one plunger towards the rotatable member.
In an embodiment, the mechanism comprises a bearing disposed between the rotatable member and the connecting rod to allow rotation of the rotatable member about the connecting rod.
In another non-limiting embodiment, a tiltable headrest is disclosed. The tiltable headrest comprises a connecting rod, a rotatable member and at least one plunger. The connecting rod is to be positioned across a plurality of rods of a seat assembly. The rotatable member is rotatably disposed on the connecting rod and the headrest is to be mounted on the rotatable member. The at least one plunger is configured to selectively engage with at least a portion of the rotatable member to arrest rotation of the rotatable member. The at least one plunger is configured to disengage from the portion of the rotatable member to allow rotation of rotatable member, where the rotation allows tilting of the headrest.
In an embodiment, the tiltable headrest comprises a first cover, and a second cover, wherein the first cover is positioned on one side of the rotatable member and the second cover is positioned on an other side opposite to the first cover to enclose the connecting rod, the rotatable member, and the at least one plunger in the tiltable headrest.
In yet another non-limiting embodiment, a seat assembly is disclosed. The seat assembly comprises a seat, a backrest, a plurality of rods, a headrest and a mechanism. The plurality of rods is positioned parallel to each other in a portion of the backrest. The headrest is receivable by the backrest. The mechanism is disposed in the headrest for tilting the headrest. The mechanism comprises a connecting rod, a rotatable member and at least one plunger. The connecting rod is to be positioned across a plurality of rods of a seat assembly. The rotatable member is rotatably disposed on the connecting rod and the headrest is to be mounted on the rotatable member. The at least one plunger is configured to selectively engage with at least a portion of the rotatable member to arrest rotation of the rotatable member. The at least one plunger is configured to disengage from the portion of the rotatable member to allow rotation of rotatable member, where the rotation allows tilting of the headrest.

In an embodiment, the mechanism comprises one or more guide members mounted on the connecting rod, where the one or more guide members are configured to receive the at least one plunger and guide the at least one plunger to move relative to the rotatable member.
In an embodiment, the mechanism comprises a protrusion defined proximal to a first end of the at least one plunger to engage with the rotatable member, the first end being defined between the rotatable member and the one or more guide members.
In an embodiment, the at least one plunger is defined with a knob on a second end defined opposite to the first end and configured to extend outside of the headrest, the knob being actuatable to actuate the plunger.
In an embodiment, the mechanism comprises at least one resilient member positioned between the one or more guide members and surrounding the at least one plunger to bias the at least one plunger towards the rotatable member.
In an embodiment, one end of the at least one resilient member is in contact with the protrusion of the at least one plunger and an other end of the at least one resilient member is in contact with a surface of a guide of the one or more guide members.
In an embodiment, the headrest comprises a first cover, and a second cover, wherein the first cover is positioned on one side of the rotatable member and the second cover is positioned on an other side opposite to the first cover to enclose the connecting rod, the rotatable member, and the at least one plunger in the tiltable headrest.
In one more non-limiting embodiment, a vehicle is disclosed. The vehicle comprises a passenger cabin and a seat assembly. The seat assembly is disposed in the passenger cabin. The seat assembly comprises a seat, a backrest, a plurality of rods, a headrest and a mechanism. The plurality of rods is positioned parallel to each other in a portion of the backrest. The headrest is receivable by the backrest. The mechanism is disposed in the headrest for tilting the headrest. The mechanism comprises a connecting rod, a rotatable member and at least one plunger. The connecting rod is to be positioned across a plurality of rods of a seat assembly. The rotatable member is rotatably disposed on the connecting rod and the headrest is to be mounted on the rotatable member. The at least one plunger is configured to selectively engage with at least a portion of the rotatable member to arrest rotation of the rotatable member. The

at least one plunger is configured to disengage from the portion of the rotatable member to allow rotation of rotatable member, where the rotation allows tilting of the headrest.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure 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 figures wherein like reference numerals represent like elements and in which:
Figure 1 is an isometric view of a vehicle depicting a seat assembly with tiltable headrest in accordance with an embodiment of the present disclosure.
Figure 2 is a side view of a seat assembly with the tiltable headrest, in accordance with an embodiment of the present disclosure.
Figure 3a is a schematic view of the tiltable headrest depicting different tilted positions, in accordance with an embodiment of the present disclosure.
Figure 3b is a front view of the tiltable headrest, in accordance with an embodiment of the present disclosure.
Figure 3c is an isometric view of the tiltable headrest, in accordance with an embodiment of the present disclosure.
Figure 3d is a schematic cut section of the tiltable headrest depicting a mechanism for tilting the headrest, in accordance with an embodiment of the present disclosure.
Figure 3e is another schematic cut section of the tiltable headrest depicting a front cover, in accordance with an embodiment of the present disclosure.

Figure 4a is an isometric view of the mechanism for tilting the headrest, in accordance with an embodiment of the present disclosure.
Figure 4b is a front view of the mechanism for tilting the headrest, in accordance with an embodiment of the present disclosure.
Figure 4c is a sectional view of the mechanism for tilting the headrest, in accordance with an embodiment of the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the system and method illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
While the embodiments in the disclosure are subject to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the figures and will be described below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, assembly, mechanism, and system that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.
Embodiments of the present disclosure discloses a mechanism for a tiltable headrest is disclosed. The mechanism comprises a connecting rod, a rotatable member and at least one plunger. The connecting rod is to be positioned across a plurality of rods of a seat assembly. The rotatable member is rotatably disposed on the connecting rod and the headrest is to be mounted on the rotatable member. The at least one plunger is configured to selectively engage

with at least a portion of the rotatable member to arrest rotation of the rotatable member. The at least one plunger is configured to disengage from the portion of the rotatable member to allow rotation of rotatable member, where the rotation allows tilting of the headrest. With such configuration, the mechanism may allow tilting of the headrest to a tilted position and may allow locking of the headrest at the tilted position. The mechanism and such tiltable headrest may reduce or eliminate gap between head of the occupant and the headrest and thereby enhance comfort of the occupant in a seat.
The term ‘vehicle’ as used herein refers to any vehicle having a passenger cabin or passenger accommodation space, and which is equipped with one or more seats for accommodating an occupant. Such vehicles are well-known in the art and include vehicles such as cars, vans, minivans, school/college buses, public transport vehicles, traveler buses, trucks, SUVs, and passenger minibuses, that are extensively used in passenger transport.
The disclosure is described in the following paragraphs with reference to Figures 1 to 4c. In the figures, the same element or elements which have same functions are indicated by the same reference signs. One skilled in the art would appreciate that the mechanism and the assembly as disclosed in the present disclosure may be used in any vehicle including but not liming to passenger vehicles, commercial vehicles and the like. The mechanism and the assembly of the present disclosure may also be implemented in any seat having a headrest without deviating from the principles of the present disclosure.
Figure 1 is an exemplary embodiment of the present disclosure which illustrates an isometric view of a vehicle (400). The vehicle (400) may be defined with a passenger cabin (401) to accommodate an occupant. The passenger cabin (401) may be disposed with a seat assembly (300) to allow the occupant to be seated on the seat assembly (300). The seat assembly (300) may be one or more of a bench seat assembly (300), a bucket seat assembly (300), and a tumble seat assembly (300). Although the present disclosure is described in the context of the seat assembly (300) configured to accommodate a single occupant as can be seen in Figure 1, such description may not be viewed as a limitation of the present disclosure and may be suitably adapted to work with bench seat and tumble seat configuration. The term ‘bench seat’ as used herein refers to a seat contoured to multiple occupants.
Referring now to Figures 2 and 3a, the seat assembly (300) may comprise a seat (301), a backrest (302), a headrest (200) and a plurality of rods (2) [shown in Figure 3a]. The seat (301)

may be positioned horizontally with respect to floor of the vehicle (400) for the occupant to sit on the seat (301) as can be seen in Figure 1. The backrest (302) may be detachably and pivotably connected to the seat (301). In an embodiment, the backrest (302) may be inclined to the seat (301) at an angle ranging from 70˚ to 110˚. The seat assembly (300) comprises the plurality of rods (2) receivable by the backrest (302). In an embodiment, a portion of the plurality of rods (2) may be receivable in the headrest (200) to connect the headrest (200) and the backrest (302). The plurality of rods (2) may be integrally defined in at least one of the headrest (200) and the backrest (302) or may be receivable in the backrest (302) and the headrest (200) as a separate component. A portion of the backrest (302) may be defined with the plurality of rods (2) and positioned parallel to each other. In an embodiment, the plurality of rods (2) may be displaced from each other in a width wise direction of the headrest (200) and in-turn that of the vehicle (400) as can be seen in Figures 3a and 3b. The plurality of rods (2) may be spaced apart in the backrest (302) and may be extending vertically from the backrest (302). The headrest (200) may be receivable by the backrest (302), where a portion of the plurality of rods (2) may be received by the headrest (200). In an embodiment, the plurality of rods (2) may allow adjustment of height of the headrest (200) relative to the backrest (302). In an embodiment, the headrest (200) may be tilted based on a preference of the occupant as can be seen in Figure 2.
Referring now to Figures 3a to 3c, the headrest (200) may include a cushion (201) on which a head of the occupant may be rested. The cushion (201) may include foam and the same shall not be considered a limitation. The plurality of rods (2) may extend through the cushion (201) to provide support to the headrest (200). The headrest (200) may include a knob (4’) extending from one end of the headrest (200). In an example, the knob (4’) may extend from the headrest (200) in the width wise direction of the vehicle (400). For instance, the knob (4’) may extend from a lateral portion of the headrest (200). In an embodiment, the knob (4’) may project laterally from the cushion (201) in a range of 5mm to 10mm. In the illustrative embodiment, the knob (4’) may be disposed on a lateral surface (202) of the headrest (200) for easy access to the occupant for operating, and the same shall not be considered a limitation. The knob (4’) may be configured to allow the occupant to lock and unlock the headrest (200) at a tilted position. In the illustrative embodiment, the knob (4’) may be displaced inward and outward, towards and away from the cushion (201), to selectively lock and unlock the headrest (200) at the tilted position. The headrest (200) may be tilted to different positions such as a first tilted position, a second tilted position, and a third tilted position as can be seen in 3a.

Referring now to Figures 3d and 3e, the headrest (200) may be structured to accommodate a mechanism (100) to tilt the headrest (200). The headrest (200) may include a first cover (10), and a second cover (11) disposed within the cushion (201) of the headrest (200). In an embodiment, the first cover (10) may be positioned on one side of mechanism (100) as can be seen in Figure 3e. The first cover (10) may be proximal to a front face side of the headrest (200). The second cover (11) may be positioned on another side opposite to the first cover (10), to enclose the mechanism (100) within the cushion (201). The second cover (11) may be positioned proximal to a rear face of the headrest (200) defined opposite to the front face. In an embodiment, the first cover (10) and the second cover (11) may be defined between the plurality of rods (2). The first cover (10) and the second cover (11) may be separated from each other in lengthwise direction of the vehicle (400). In an embodiment, the headrest (200) may include a third cover (12) positioned behind the first cover (10) and the second cover (11). The cushion (201) and a cushion cover of the headrest (200) may be fitted to the first cover (10), the second cover (11) and the third cover (12).
Referring now to Figures 4a to 4c, the mechanism (100) may include a connecting rod (1), a rotatable member (3) and at least one plunger (4). The connecting rod (1) is to be positioned across the plurality of rods (2) of the seat assembly (300) and may extend in the width direction of the vehicle (400). Each rod of the plurality of rods (2) may be defined with a receiving bracket (5). In the illustrative embodiment, the receiving bracket (5) is depicted at an end of the plurality of rods (2) and the same shall not be considered a limitation. In an embodiment, the plurality of rods (2) may include two rods parallel to each other. Each receiving bracket (5) may be defined with at least one groove (5’) to receive a portion of the connecting rod (1). The connecting rod (1) may extend between the two rods of the plurality of rods (2). The rotatable member (3) may be rotatably disposed on a portion of the connecting rod (1). In an embodiment, the rotatable member (3) may receive the headrest (200). For sake of illustration the rotatable member (3) is depicted to be disposed centrally on the connecting rod (1), and the same shall not be considered a limitation.
The mechanism (100) may include one or more guide members (7) mounted on a portion of the connecting rod (1). The one or more guide members (7) may receive the at least one plunger (4) and guide the at least one plunger (4) to move relative to the rotatable member (3). In an embodiment, the rotatable member (3) may be a cylinder or a disc defined with at least a circumferential portion (3a) and at least one lateral portion (3b) defined adjacent to the

circumferential portion (3a) as can be seen in Figure 4a. The at least one plunger (4) may be guided by the one or more guide members (7) to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) about the connecting rod (1). The at least one plunger (4) may engage with at least one of the circumferential portion (3a) and the at least one lateral portion (3b). In the illustrative embodiment, the at least one plunger (4) engages with one engaging portion of a plurality of engaging portions (6) defined along the at least one lateral portion (3b). The at least one plunger (4) may disengage from the one engaging portion of the plurality of engaging portions (6) of the rotatable member (3) to allow rotation of rotatable member (3) about the connecting rod (1). The rotation of the rotatable member (3) about the connecting rod (1) may tilt/rotate the headrest (200) about the connecting rod (1).
In an embodiment, the rotatable member (3) may be defined with the plurality of engaging portions (6) defined on a face of the rotatable member (3). For example, the plurality of engaging portions (6) may include a plurality of indents, cavities, grooves, protrusions and the like. For the sake of explanation, the plurality of engaging portions (6) is depicted with a plurality of indents on the at least one lateral portion (3b) of the rotatable member (3) to selectively receive the at least one plunger (4) for locking and unlocking of the headrest (200) during upon tilting. In an embodiment, the plurality of engaging portions (6) may be circumferentially distributed along the at least one lateral portion (3b) of the rotatable member (3). The at least one plunger (4), upon engagement with one portion of the plurality of engaging portions (6), may restrict the rotation of the rotatable member (3), where the at least one plunger (4) may be guided by the one or more guide members (7). In an embodiment, the at least one plunger (4) may engage with one portion of the plurality of engaging portions (6) to arrest tilting of the headrest (200) at a tilted position. The at least one plunger (4) may disengage from the one portion of plurality of engaging portions (6) for allowing the rotatable member (3) to rotate about the connecting rod (1) to unlock the headrest (200) at the tilted position.
Referring again to Figure 4b, the at least one plunger (4) may be defined with a first end (4a) between the rotatable member (3) and the one or more guide members (7). The at least one plunger (4) may be defined with a second end (4b) opposite to the first end (4a). The second end (4b) of the at least one plunger (4) may extend outside of the headrest (200) to define the knob (4’). The knob (4’) may be adapted to be actuated to actuate the at least one plunger (4) to selectively allow tilting of the headrest (200). In an embodiment, the at least one plunger (4)

may be defined with a protrusion (4’’) proximal to the first end (4a) of the at least one plunger (4), where the first end (4a) may be adapted to engage with the rotatable member (3) as can be seen in Figure 4b and Figure 4c. For sake of illustration, the protrusion (4’’) is depicted with a disc profile defined along circumference of the at least one plunger (4), and the same shall not be considered a limitation.
In an embodiment, the one or more guide members (7) include two guide members (7) a first guide member (7a) and a second guide member (7b), where the first guide member (7a) may be defined proximal to the first end (4a) of the at least one plunger (4) and the second guide member (7b) may be defined proximal to the second end (4b) of the at least one plunger (4). The mechanism (100) may include at least one resilient member (8) positioned between the one or more guide members (7) and surrounding the at least one plunger (4). The at least one resilient member (8) may be defined along length of the at least one plunger (4), to bias the at least one plunger (4) towards the rotatable member (3). In an embodiment, the at least one resilient member (8) may be positioned between the one or more guide members (7), where one end of the at least one resilient member (8) may engage with the protrusion (4’’) of the at least one plunger (4). An other end of the at least one resilient member (8) opposite to the one end may engage with the second guide member (7b) as best seen in Figure 4b. In an embodiment, the at least one plunger (4) may be pulled and released by the occupant, resulting in compression and expansion, respectively, of the at least one resilient member (8) to selectively unlock and lock the headrest (200) from the tilted position. In an embodiment, the least one resilient member (8) may be a spring. For the sake of explanation, the at least one resilient member (8) is depicted as a compression spring. However, torsion springs and torsion bars, may also be used to bias the at least one plunger (4).
In an embodiment, the at least one plunger (4) may be displaced away from the rotatable member (3) to unlock the headrest (200) and allow tilting to the tilted position. The occupant of the seat (301) may pull the knob (4’) extending from the headrest (200) to displace the at least one plunger (4) away from the rotatable member (3). When the knob (4’) is pulled, the at least one resilient member (8) may be compressed between the protrusion (4’’) and the second guide member (7b). The at least one resilient member (8) may remain compressed until the occupant releases the knob (4’). The occupant may tilt the headrest (200) about the connecting rod (1) by the rotatable member (3), where the rotatable member (3) rotates about the connecting rod (1) due to force imparted on the headrest (200) by the occupant.

In the illustrative embodiment, a bearing (9) may be disposed between the rotatable member
(3) and the connecting rod (1) to allow rotation of the rotatable member (3) about the
connecting rod (1) and tilting of the headrest (200) to the tilted position. In an embodiment, the
bearing (9) may be fitted inside the rotatable member (3).
Further, upon release of the knob (4’) by the occupant after tilting the headrest (200) to the tilted position, the at least one resilient member (8) may relax between the protrusion (4’’) and the second guide member (7b), pushing the protrusion (4’’) away from the second guide member (7b) and towards the rotatable member (3). The first end (4a) of the at least one plunger
(4) may displace towards the rotatable member (3) and may engage with one engaging portion
of the plurality of engaging portions (6) of the rotatable member (3) to restrict rotation of the
rotatable member (3). Thus, the mechanism (100) may selectively lock and unlock the headrest
(200) to allow tilting of the headrest (200).
Referring again to Figure 3d, the tiltable headrest (200) may include a connecting rod (1), a rotatable member (3) and at least one plunger (4). The connecting rod (1) is to be positioned across the plurality of rods (2) of the seat assembly (300). Each rod of the plurality of rods (2) may be defined with a receiving bracket (5) defined on a portion of the plurality of rods (2). In the illustrative embodiment, the receiving bracket (5) is depicted at an end of the plurality of rods (2) and the same shall not be considered a limitation. In an embodiment, the plurality of rods (2) may include two rods parallel to each other and each rod may be defined with a receiving bracket (5). Each receiving bracket (5) may be defined with at least one groove (5’) to receive a portion of the connecting rod (1). The connecting rod (1) may extend between the two rods of the plurality of rods (2), where the connecting rod (1) may be substantially parallel to the bottom face of the cushion (201) of the headrest (200). The rotatable member (3) may be rotatably disposed on a portion of the connecting rod (1). In an embodiment, the rotatable member (3) may receive the headrest (200). For sake of illustration the rotatable member (3) is depicted to be disposed centrally on the connecting rod (1), and the same shall not be considered a limitation. The mechanism (100) may include one or more guide members (7) mounted on a portion of the connecting rod (1). The one or more guide members (7) may receive the at least one plunger (4) and guide the at least one plunger (4) to move relative to the rotatable member (3). The at least one plunger (4) may be guided by the one or more guide members (7) to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) about the connecting rod (1). The at least one plunger (4)

may disengage from the portion of the rotatable member (3) to allow rotation of rotatable member (3) about the connecting rod (1). The rotation of the rotatable member (3) about the connecting rod (1) may rotate the cushion (201) mounted on the rotatable member (3) and thereby tilt/rotate the headrest (200) about the connecting rod (1).
In an embodiment, the mechanism (100) may be enclosed within the cushion (201) of the headrest (200) to maintain aesthetics of the headrest (200).
In an embodiment, the rotatable member (3) may include a ratchet and the at least one plunger (4) may include a pawl configured to engage with the ratchet to selectively lock and unlock the headrest (200) for tilting the headrest (200).
In an embodiment, the mechanism (100) may function independently from vertical adjustment of the headrest (200), thereby increasing convenience of the occupant.
In an embodiment, the plurality of engaging portions (6) may be defined along the circumferential portion (3a) of the rotatable member (3).
In an embodiment, the knob (4’) may extend outside the headrest (200) and may provide easy access to the occupant to operate the mechanism (100) and tilt the headrest (200) to the tilted position.
In an embodiment, the mechanism (100) may allow tilting of the headrest (200) to a tilted position and may allow locking of the headrest (200) at the tilted position. Further, the mechanism (100) may reduce or eliminate gap between head of the occupant and the headrest (200) and thereby enhance comfort of the occupant in the seat (301).
In an embodiment, the tiltable headrest (200) may avoid whiplash of the occupant in the event of crash of the vehicle (400).
In an embodiment, the tiltable headrest (200) may be easily operable due to simple mechanism (100).
In an embodiment, the mechanism (100) includes minimal components and may enhance simplicity and cost of the tiltable headrest (200).

EQUIVALENTS
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C

together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Referral Numeral:

Component Referral numeral
Mechanism 100
Headrest 200
Cushion 201
Lateral surface 202
Connecting rod 1
Plurality of rods 2
Rotatable member 3
Circumferential portion 3a
At least one lateral portion 3b
At least one plunger 4
Knob 4’
Protrusion 4’’
First end 4a
Second end 4b

Receiving bracket 5
At least one groove 5’
plurality of engaging portions 6
One or more guide members 7
First guide member 7a
Second guide member 7b
At least one resilient member 8
Bearing 9
First cover 10
Second cover 11
Seat assembly 300
Seat 301
Backrest 302
Vehicle 400
Passenger cabin 401

We claim:
1. A mechanism (100) for a tiltable headrest (200), the mechanism (100) comprising:
a connecting rod (1) to be positioned across a plurality of rods (2) of a seat (301);
a rotatable member (3) rotatably disposed on the connecting rod (1) and on which the headrest (200) is to be mounted; and
at least one plunger (4), being configured to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) and to disengage from the portion of the rotatable member (3) to allow rotation of rotatable member (3), wherein the rotation allows tilting of the headrest (200).
2. The mechanism (100) as claimed in claim 1, wherein the rotatable member (3) is defined
with a plurality of engaging portions (6) defined on a face of the rotatable member (3), each engaging portion of the plurality of engaging portions (6) being configured to receive and secure the at least one plunger (4).
3. The mechanism (100) as claimed in claim 2, wherein the at least one plunger (4) is
configured to engage and disengage with the plurality of engaging portions (6) to selectively allow tilting of the headrest (200) and lock the headrest (200) at a tilted position respectively.
4. The mechanism (100) as claimed in claim 1, comprising one or more guide members (7)
mounted on the connecting rod (1), where the one or more guide members (7) are configured to receive the at least one plunger (4) and guide the at least one plunger (4) to move relative to the rotatable member (3).
5. The mechanism (100) as claimed in claim 4, comprising a protrusion (4’’) defined
proximal to a first end (4a) of the at least one plunger (4), the first end (4a) being defined between the rotatable member (3) and the one or more guide members (7).
6. The mechanism (100) as claimed in claim 5, wherein the at least one plunger (4) is
defined with a knob (4’) on a second end (4b) defined opposite to the first end (4a) and configured to extend outside of the headrest (200), the knob (4’) being actuatable to actuate the at least one plunger (4).

7. The mechanism (100) as claimed in claim 6, comprising at least one resilient member
(8) positioned between the one or more guide members (7) and surrounding the at least one plunger (4), to bias the at least one plunger (4) towards the rotatable member (3).
8. The mechanism (100) as claimed in claim 1, comprising a bearing (9) disposed between
the rotatable member (3) and the connecting rod (1) to allow rotation of the rotatable member (3) about the connecting rod (1).
9. A tiltable headrest (200), comprising:
a connecting rod (1) to be positioned across a plurality of rods (2) of a seat (301);
a rotatable member (3) rotatably disposed on the connecting rod (1) and on which the headrest (200) is to be mounted; and
at least one plunger (4), being configured to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) and to disengage from the portion of the rotatable member (3) to allow rotation of rotatable member (3), wherein the rotation allows tilting of the headrest (200).
10. The tiltable headrest (200) as claimed in claim 9, comprising a first cover (10), and a second cover (11), wherein the first cover (10) is positioned on one side of the rotatable member (3) and the second cover (11) is positioned on an other side opposite to the first cover (10) to enclose the connecting rod (1), the rotatable member (3), and the at least one plunger (4) in the tiltable headrest (200).
11. A seat assembly (300), comprising:
a seat (301);
a backrest (302);
a plurality of rods (2) positioned parallel to each other in a portion of the backrest (302);
a headrest (200) receivable by the backrest (302); and
a mechanism (100) disposed in the headrest (200) for tilting the headrest (200), the mechanism (100) comprising:
a connecting rod (1) to be positioned across the plurality of rods (2) of the
seat (301);
a rotatable member (3) rotatably disposed on the connecting rod (1) and on
which the headrest (200) is to be mounted; and

at least one plunger (4), being configured to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) and to disengage from the portion of the rotatable member (3) to allow rotation of rotatable member (3), wherein the rotation allows tilting of the headrest (200).
12. The seat assembly (300) as claimed in claim 11, wherein the mechanism (100) comprises one or more guide members (7) mounted on the connecting rod (1), where the one or more guide members (7) are configured to receive the at least one plunger (4) and guide the at least one plunger (4) to move relative to the rotatable member (3).
13. The seat assembly (300) as claimed in claim 12, wherein the mechanism (100) comprises a protrusion (4’’) defined proximal to a first end (4a) of the at least one plunger (4), wherein the first end (4a) being defined between the rotatable member (3) and the one or more guide members (7).
14. The seat assembly (300) as claimed in claim 11, wherein the at least one plunger (4) is defined with a knob (4’) on a second end (4b) defined opposite to the first end (4a) and configured to extend outside of the headrest (200).
15. The seat assembly (300) as claimed in claim 13, wherein the mechanism (100) comprises at least one resilient member (8) positioned between the one or more guide members (7) and surrounding the at least one plunger (4), to bias the at least one plunger (4) towards the rotatable member (3).
16. The seat assembly (300) as claimed in claim 15, wherein one end of the at least one resilient member (8) is in contact with the protrusion (4’’) of the at least one plunger (4) and an other end of the at least one resilient member (8) is in contact with a surface of a guide of the one or more guide members (7).
17. The seat assembly (300) as claimed in claim 11, wherein the headrest (200) comprises a first cover (10), and a second cover (11), wherein the first cover (10) is positioned on one side of the mechanism (100) and the second cover (11) is positioned on an other side opposite to the first cover (10) to enclose the mechanism (100) in the headrest (200).

18. A vehicle (400), comprising:
a passenger cabin (401); and
a seat assembly (300) disposed in the passenger cabin (401), the seat assembly (300) comprising:
a seat (301); a backrest (302);
a headrest (200) receivable by the backrest (302); and a plurality of rods (2) positioned parallel to each other in a portion of the backrest (302);
a mechanism (100) comprising:
a connecting rod (1) to be positioned across the plurality of rods (2) of the seat (301);
a rotatable member (3) rotatably disposed on the connecting rod (1) and on which the headrest (200) is to be mounted; and
at least one plunger (4), being configured to selectively engage with at least a portion of the rotatable member (3) to arrest rotation of the rotatable member (3) and to disengage from the portion of the rotatable member (3) to allow rotation of rotatable member (3), wherein the rotation allows tilting of the headrest (200).