DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
ADJUSTABLE TWOFOLD ARMREST FOR ADJACENT SEATS

Applicant:
Tata Motors Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai - 400001,
Maharashtra, India

The following specification particularlydescribes the invention and the manner in which it is to be performed.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority from Indian Patent application no. (201921011811) filed on 26th March, 2019.
FIELD OF THE INVENTION

[0002] The present invention generally relates to vehicle seats and more particularly relates to the adjustable armrests of the adjacent vehicle seats.

OBJECTS OF THE DISCLOSURE

[0003] One object of the present disclosure is to provide an adjustable armrest that caters to both adjacent passengers.

[0004] Another object of the present disclosure is to provide an adjustable armrest that easy to operate.
SUMMARY OF INVENTION

[0005] The present subject matter discloses an adjustable twofold armrest assembly for adjacent seats comprising arms to form as the arm rest for both the adjacent seat members. A bracket B1 is provided with the provision to mount arm and pins are configured for movement/working of the various parts of the adjustable twofold armrest assembly. A bracket B2 for securely mounting of the said adjustable twofold armrest assembly to a rigid vehicular structure. Push button spring lock for opening and closing of said adjustable twofold armrest assembly by movement/working of the various parts of the adjustable twofold armrest assembly. The arm, a bigger arm of the two arms is configured to accommodate smaller arm to be placed and packaged completely inside bigger arm which is a hollow from inside. The bigger arm is configured of 5 solid sides and 1 side open for accommodation and operation of a smaller arm.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES

[0006] 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:

[0007] FIG. 1 illustrates a schematic representation of currently existing common armrest for adjacent seats;

[0008] FIG. 2 illustrates 3D Representation of Adjustable Twofold Armrest, in accordance with one embodiment of the present invention;

[0009] FIG. 2a illustrates a schematic 3D Representation of B1, in accordance with one embodiment of the present invention;

[0010] FIG. 3 illustrates a schematic representation of Operational Details: Position 1, in accordance with another embodiment of the present invention;

[0011] FIG. 4 illustrates a schematic representation of Operational Details: Position 2, in accordance with another embodiment of the present invention;

[0012] FIG. 5 illustrates a schematic representation of Operational Details: Position 3, in accordance with another embodiment of the present invention;

[0013] FIGs. 6 and 6a illustrates a schematic representation of Operational Details: Position 4, in accordance with another embodiment of the present invention;

[0014] FIG. 7 illustrates a schematic representation of locking mechanism, in accordance with another embodiment of the present invention;

[0015] FIG. 8 illustrates a schematic representation of Arm Movement Mechanism using (rack and pinion), in accordance with another embodiment of the present invention; and

[0016] FIG. 9 illustrates a schematic representation of Armrest Positions: Initial - Final position, in accordance with another embodiment of the present invention.

[0017] 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 illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION

[0018] The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

[0019] The subject invention is related to armrest particularly directed towards shared or common armrest between adjacent seats in the buses and aircraft. Due to the small pitch of the lateral seats in the buses and aircraft, many a times there is only one armrest between adjacent seats. This often leads to discomfort of the passengers due to lack of proper support to the arm. To address this issue twofold armrest is a true solution.

[0020] The present subject matter discloses an adjustable twofold armrest. The adjustable twofold armrest has two arms packaged in the space of one arm rest. It maximizes the usage of limited space and provides support to the arms of both the adjacent passengers. Image 2.a shows how adjustable twofold armrest are packaged. Arms A1 is a bigger arm of the two Arms (A1 and A2). Arm A2 is configured to be placed and packaged inside Arm A1, which is a hollow from inside and accommodates Arm A2 fully. Arm A1 comprises of 5 solid sides and 1 side remains open for operation of Arm 2 which is a solid arm. Adjustable twofold armrest comprises of components as listed in Figure 2a. like Arm A1, Arm A2, Bracket B1, holes H1 to H4, push buttons spring locks BL1, BL2, BL3, rubber bush R1 is mounted on the pivot point of bracket B1 and B2 to facilitate pivotal movement of bracket 1 against support bracket B2, and pins P1, P2, P3. The bracket B1 has lateral protrusions (S1, S2) which are linearly protruded along the longitudinal axis of the arm rest. The protrusion S1 is provided for the movement of pin P2 from hole H1 position to hole H2 position to facilitate the movement of arm A1 from closed position to open position and vice versa. The protrusion S2 is provided for the movement of pin P3 from hole H3 position to hole H4 position to facilitate the movement of arm A2 from closed position to open position and vice versa. There are three push buttons spring locks BL1, BL2, BL3 provided on the arm rest assembly. The push button spring locks BL1 is provided for releasing the locking between the arms A1 and A2. Push button spring lock BL2 is provided for releasing/disengage the locking of Arm A2 to move the pin P3 from H3 to H4 position for movement of the arm A2 from closed position to open position and vice versa. Push button spring lock BL3 is provided for releasing/disengage the locking of Arm A1 to move the pin P2 from H1 to H2 position for movement of the arm A1 from closed position to open position and vice versa. The holes H1 and H3 are provided and positioned on the central longitudinal axis of the arm rest assembly. The position of the holes H2 and H4 are provided on the opposite sides and away from the central longitudinal axis. The movement of the arms A1 and A2 is in opposite side to the central longitudinal axis while opening and towards the central longitudinal axis while closing of the arms A1 and A2.

[0021] Arms A1 and A2 are configured to be rotated along its respective pins P2 and P3 in open position for projecting the arms angularly outside around its pivot pins. The opening of arm A1 is facilitated by rotating it about its pin P2, then unlock the guide path by pressing the BL3 to move A1 from H1 to H2. The guide path is open for movement. Manually Move the arm from H1 to H2 and then lock the pin in H2 by again pressing the BL2 to keep the Arm 1 in open position and vice versa. The opening of arm A2 is facilitated by rotating it about its pin P3, then unlock the guide path by pressing the BL2 to move A2 from H3 to H4. The guide path is open for movement. Manually Move the arm from H3 to H4 and then lock the pin in H4 by again pressing the BL2 to keep the Arm 2 in open position and vice versa.

[0022] Figure 2 shows the 3D representation of armrest in initial position along with pin P2 and P3 locations as shown in figure 3. Arm A1 and Arm A2 are mounted on brackets B1 on protrusions S1 and S2 respectively. B1 with protrusions S1 and S2 is shown in the expanded view in Figure 2a and Figure 2. Arm A1 is mounted on bracket B1 and protrusion S1 at hole H1 and Arm A2 is mounted on bracket B1 and protrusion S2 at hole H3. During operation arm A1 moves from it H1 position to H2 position while arm A2 moves from H3 position to H4 position which are in opposite opening directions of arms A1 and A2 with each other.

[0023] Referring to Figure 8 which shows the initial position i.e., the Position 1 of adjustable twofold armrest. Arm A1 is mounted on Bracket B1 at H1 and Arm A2 is mounted on bracket B1 at H3. The of the holes H1 and H3 are provided and positioned on the central longitudinal axis of the arm rest assembly. The position of the holes H2 and H4 are provided on the opposite sides and away from the central longitudinal axis.

[0024] Arm Movement mechanism for arm A1 to move from holes H1 to H2 (Refer image 8), there is a pin at holes H1, this pin has a pinion at the top edge (the pinion has teeth covering its half circumference). Along the path from holes H1 to H2, there is a guide which has mating rack of pinion. When Arm A1 is moved from holes H1 to H2, the pinion over pin2 moves along the mating rack (rack 1) and facilitate the movement during forward movement. During the backward movement the pinion mates with rack 2 and facilitate the backward movement. Arm Movement mechanism for arm A2 to move from holes H3 to H4 (Refer image 8), there is a pin at H3, this pin has a pinion at the top edge (the pinion has teeth covering its half circumference). Along the path from holes H3 to H4, there is a guide which has mating rack of pinion. When Arm A2 is moved from holes H3 to H4, the pinion over pin 3 moves along the mating rack (rack 1) and facilitate the movement during forward movement. During the backward movement the pinion mates with rack 2 and facilitate the backward movement.

[0025] The present subject matter discloses an adjustable twofold armrest assembly for adjacent seats comprising arms (A1, A2) to form as the arm rest for both the adjacent seat members. A bracket B1 is provided with the provision to mount arm (A1, A2) and pins (P1, P2, P3) are configured for movement/working of the various parts of the adjustable twofold armrest assembly. A bracket B2 for securely mounting of the said adjustable twofold armrest assembly to a rigid vehicular structure. Push button spring lock (BL1, BL2, BL3) for opening and closing of said adjustable twofold armrest assembly by movement/working of the various parts of the adjustable twofold armrest assembly.

[0026] The arm A1 a bigger arm of the two arms A1 and A2 wherein arm A2 is configured to be placed and packaged completely inside Arm A1 which is a hollow from inside. The arm A1 is configured of 5 solid sides and 1 side open for accommodation and operation of a solid arm A2. The adjustable twofold armrest assembly is configured with a rubber bush R1 mounted on the pivot point of bracket B1 and B2 to facilitate smooth pivotal movement of bracket 1 against support bracket B2. The bracket B1 has lateral protrusions (S1, S2), linearly protruded along the axis of the longitudinal axis of the arm rest wherein the protrusion S1 is configured for the movement of pin P2 from hole H1 position to hole H2 position to facilitate the movement of arm A1 from closed position to open position and vice versa and the protrusion S2 is configured for the movement of pin P3 from hole H3 position to hole H4 position to facilitate the movement of arm A2 from closed position to open position and vice versa. The push button spring lock (BL1, BL2, BL3) is configured with three push buttons spring locks (BL1, BL2, BL3) provided on the arm rest assembly wherein the push button spring locks BL1 is provided for releasing the locking between the arms A1 and A2, said push button spring locks BL2 is provided for releasing/disengage the locking of Arm A2 to move the pin P3 from H3 to H4 position for movement of the arm A2 from closed position to open position and vice versa and said push button spring locks BL3 is provided for releasing/disengage the locking of Arm A1 to move the pin P2 from H1 to H2 position for movement of the arm A1 from closed position to open position and vice versa.

[0027] The holes H1 and H3 are configured and positioned on the central longitudinal axis of the arm rest assembly and holes H2 and H4 are provided on the opposite sides and away from the central longitudinal axis. The movement of said arms A1 and A2 is configured in opposite side to the central axis while opening and towards the central longitudinal axis while closing of the arms A1 and A2. The arms A1 and A2 are configured to be rotated along its respective pins P2 and P3 in open position for projecting the arms angularly outside around its pivot pins. The opening of arm A1 is facilitated by rotating it about its pin P2 and unlocking the guide path by pressing the push buttons spring lock BL3 to move A1 through guide path H1 to H2 and then locking the pin P2 in H2 by again pressing the push buttons spring lock BL3 for opening of arm A1 and vice versa. The arm A2 is configured to be rotated about its pin P3 and unlocking the guide path by pressing the push buttons spring lock BL2 to move A2 through guide path from H3 to H4 and then locking the pin P3 in H4 by again pressing the push buttons spring lock BL2 for opening of arm A2 and vice versa.

[0028] The pin P2 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H1 to H2 is configured with a mating rack RA1 to facilitate movement of arm A1 from holes H1 to H2 during forward movement of pinion of Pin P2 in rack RA1. The pin P2 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H2 to H1 is configured with a mating rack RA2 to facilitate movement of arm A1 from holes H2 to H1 during backward movement of pinion of Pin P2 in rack RA2.

[0029] The pin P3 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H3 to H4 is configured with a mating rack RA1 to facilitate movement of arm A2 from holes H3 to H4 during forward movement of pinion of Pin P3 in rack RA1. The pin P3 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H4 to H3 is configured with a mating rack RA2 to facilitate movement of arm A2 from holes H4 to H3 during backward movement of pinion of Pin P3 in rack RA2.

[0030] The push buttons spring locks BL1, BL2, BL3 are configured to work on the principle of retractable pen click button mechanism. The holes H1, H2, H3, H4 are configured with 4 rubber bushes for smooth and directional movement of pins P2 and P3 through slot between holes H1 to H2 and H3 to H4.

[0031] The working of the arm rest is as follows:
Sr 1 : The Adjustable twofold armrest is at its initial position, BL1 is pressed to unlock Arm A1 and Arm A2.
Sr 2: Arm A2 is rotated about its pin P3, then unlock the guide path by pressing the BL2 to move A2 from holes H3 to H4. The guide path is open for movement. Manually Move the arm from holes H3 to H4 and then lock the pin in hole H4 by again pressing the BL2.
Sr 3: Now to move A1 to its final position, Arm A1 is rotated about its pin P2, then unlock the guide path by pressing BL3 to move A1 from holes H1 to H2. The guide path is open for movement. Manually Move the arm from holes H1 to H2 and then lock the pin in hole H2 by again pressing the BL3.
Sr 4: Final position, arm rest A1 and A2 available for both the adjacent seats. BL1, BL2, BL3 work on the principle of retractable pen click button mechanism.

[0032] Components of Adjustable Twofold Armrest:
1. Arm 1 (A1)
2. Arm 2 (A2)
3. Bracket (B1) (Hn-Holes in the bracket, where n=1,2,3,4)
4. 3 Push Button spring lock (BL1,BL2,BL3)
5. Rubber Bush (R1) and Rubber bush at each hole
6. Support Bracket (B2)
7. Pin (P1,P2, P3)
8. Rack and pinion mechanism

Description of Operation Details:
• Serial No.1 shows the initial position of armrest where arm1 and arm2 are packaged as a single entity.
• To operate this armrest as two individual armrest for adjacent passengers in buses and aircraft, push BL1 which is a spring lock, it will disengage arm1 and arm2 from each other. Thus arm1 and arm2 will be free to be moved from its initial position to final position to act as an individual armrest (Position 1)
• At this point, arm1 and arm2 are locked in their respective positions H1 and H3 through BL2 and BL3 (spring lock)
• Push BL2 to disengage the lock so that the arm2 is free to move from H3 to H4 (Position 2), and when arm is moved to H4, release the button BL2 to engage the lock
• Push BL3 to disengage the lock so that the arm1 is free to move from H1 to H2 (Position 3), and when arm is moved to H2, release the button BL3 to engage the lock
• Position 4 shows the final position of the adjustable twofold armrest
• The movement of arm A1 and arm A2 from holes H1 to H2 (vice versa) and holes H3 to H4 (vice versa) is based on a rack and pinion mechanism. The rack and mating pinion teeth are designed and arranged such that during movement of arm from one hole to another, the teeth do not get interlock and provide smooth back and forth movement.

[0033] The through slots in the bracket B1 are fitted with rack on both the side of slots and mating pinion is attached around the pin P2 and P3. The pinion is as show in figure below. There are 4 rubber bushes one in each holes H1 to H4. The there are two guide place in through slot between holes H1 to H2 and H3 to H4 for smooth and directional movement of pins.

Equivalents

[0034] 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.

[0035] 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."

[0036] 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.

,CLAIMS:
1. An adjustable twofold armrest assembly for adjacent seats comprising
at least one arm (A1, A2) to form as the arm rest for both the adjacent seat members;
at least one bracket B1 configured with the provision to mount at least one arm (A1, A2);
at least one pin (P1, P2, P3) configured for movement/working of the various parts of the adjustable twofold armrest assembly;
at least one bracket B2 for securely mounting of the said adjustable twofold armrest assembly to a rigid vehicular structure; and
at least one push button spring lock (BL1, BL2, BL3) for opening and closing of said adjustable twofold armrest assembly by movement/working of the various parts of the adjustable twofold armrest assembly.

2. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said at least one arm is configured with Arms A1 a bigger arm of the two arms A1 and A2 wherein arm A2 is configured to be placed and packaged completely inside Arm A1 which is a hollow from inside.

3. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said arm A1 is configured of 5 solid sides and 1 side open for accommodation and operation of a solid arm A2.

4. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said adjustable twofold armrest assembly is configured with a rubber bush R1 mounted on the pivot point of bracket B1 and B2 to facilitate smooth pivotal movement of bracket 1 against support bracket B2

5. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said bracket B1 has lateral protrusions (S1, S2), linearly protruded along the axis of the longitudinal axis of the arm rest wherein the protrusion S1 is configured for the movement of pin P2 from hole H1 position to hole H2 position to facilitate the movement of arm A1 from closed position to open position and vice versa and the protrusion S2 is configured for the movement of pin P3 from hole H3 position to hole H4 position to facilitate the movement of arm A2 from closed position to open position and vice versa.

6. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said at least one push button spring lock (BL1, BL2, BL3) is configured with three push buttons spring locks (BL1, BL2, BL3) provided on the arm rest assembly wherein the push button spring locks BL1 is provided for releasing the locking between the arms A1 and A2, said push button spring locks BL2 is provided for releasing/disengage the locking of Arm A2 to move the pin P3 from H3 to H4 position for movement of the arm A2 from closed position to open position and vice versa and said push button spring locks BL3 is provided for releasing/disengage the locking of Arm A1 to move the pin P2 from H1 to H2 position for movement of the arm A1 from closed position to open position and vice versa.

7. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said holes H1 and H3 are configured and positioned on the central longitudinal axis of the arm rest assembly and holes H2 and H4 are provided on the opposite sides and away from the central longitudinal axis.

8. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein the movement of said arms A1 and A2 is configured in opposite side to the central axis while opening and towards the central longitudinal axis while closing of the arms A1 and A2.

9. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said arms A1 and A2 are configured to be rotated along its respective pins P2 and P3 in open position for projecting the arms angularly outside around its pivot pins.

10. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said opening of arm A1 is facilitated by rotating it about its pin P2 and unlocking the guide path by pressing the push buttons spring lock BL3 to move A1 through guide path H1 to H2 and then locking the pin P2 in H2 by again pressing the push buttons spring lock BL3 for opening of arm A1 and vice versa.

11. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said arm A2 is configured to be rotated about its pin P3 and unlocking the guide path by pressing the push buttons spring lock BL2 to move A2 through guide path from H3 to H4 and then locking the pin P3 in H4 by again pressing the push buttons spring lock BL2 for opening of arm A2 and vice versa.

12. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said pin P2 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H1 to H2 is configured with a mating rack RA1 to facilitate movement of arm A1 from holes H1 to H2 during forward movement of pinion of Pin P2 in rack RA1.

13. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said pin P2 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H2 to H1 is configured with a mating rack RA2 to facilitate movement of arm A1 from holes H2 to H1 during backward movement of pinion of Pin P2 in rack RA2.

14. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said pin P3 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H3 to H4 is configured with a mating rack RA1 to facilitate movement of arm A2 from holes H3 to H4 during forward movement of pinion of Pin P3 in rack RA1.
15. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said pin P3 is configured with a pinion at the top edge with teeth covering its half circumference and the path/guide from holes H4 to H3 is configured with a mating rack RA2 to facilitate movement of arm A2 from holes H4 to H3 during backward movement of pinion of Pin P3 in rack RA2.

16. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein said push buttons spring locks BL1, BL2, BL3 are configured to work on the principle of retractable pen click button mechanism.

17. The adjustable twofold armrest assembly for adjacent seats as claimed in claim 1 wherein each of said holes H1, H2, H3, H4 are configured with 4 rubber bushes for smooth and directional movement of pins P2 and P3 through slot between holes H1 to H2 and H3 to H4.