Description:FIELD OF INVENTION
[0001] The present invention relates to a railway coach car and more particularly, to a seat/berth of the railway coach car having composite parts.
BACKGROUND
[0002] Railway industry needs lightweight materials and structures for rail 5 vehicles in order to meet the challenges it faces in terms of capacity increases and energy efficiency. Light weighting also brings reductions in vehicle operating costs. Furthermore, lighter vehicles cause less damage to track, thereby reducing infrastructure renewal costs. Railroad passenger car comprises berths and seats for seating passengers in the carriage. Contemporarily fiber reinforced plastics (FRP) 10 material is being used in manufacturing of some designs of berths and seats. Fiber reinforced plastic (FRP) material provides advantages in light weighting, aesthetics, and long life. But at the same time, it lays low in stiffness and cost in manufacturing a product. Prior arts reveal that these berths can be made completely from FRP material by Mold pressing. However, the above design involves high 15 cost due to extensive use of FRP material and also only utilizing FRP provides inadequate stiffness to the overall structure.
[0003] Therefore, there is a requirement for an efficient structure that provides adequate stiffness along with gaining the advantages of light weighting in the overall structure. 20
OBJECTIVE OF INVENTION
[0004] It is an object of the invention to obtain develop a railway coach seat that uses a combination of steel and Glass Fiber Reinforced Plastic (GFRP) composite parts to achieve appropriate strength, light weight, and improved vibration isolation properties. Thus, providing better travel comfort to the passengers. 25
SUMMARY OF INVENTION
[0005] This summary is provided to introduce concepts related to a railway coach car seat. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the
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claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0006] In one aspect of the present invention, a railway coach seat is provided. The railway coach seat comprises a cushion pad and a seat frame assembly. The cushion pad is detachably coupled to the seat frame assembly. The seat assembly 5 comprises a base frame made of first material. The seat assembly also comprises an exterior tray assembly made of second material enclosing at least portion of the base frame. The exterior tray assembly comprises a continuous side perimeter wall and a bottom wall. The exterior tray assembly also comprises a top wall secured to top side of continuous side wall perimeter. The exterior tray assembly further 10 comprises at least one bottom cover member secured to lower side of the bottom wall.
[0007] In an embodiment, the first material is metal. In an embodiment, the first material is selected from one of Steel, aluminium, metal-alloy.
[0008] In an embodiment, the second material is fiber reinforced material. In an 15 embodiment, the second material is glass fiber reinforced material.
[0009] In an embodiment, the cushion pad comprises at least one polyurethane pad, a wire frame, and a seat trim disposed on upper side of the at least one polyurethane pad.
[0010] In an embodiment, the continuous side perimeter wall is a double walled 20 structure having a gap therein between.
[0011] In an embodiment, the seat frame assembly comprises at least one stiffener member. The at least one stiffener member includes a first stiffener member, a second stiffener member, a third stiffener member, a fourth stiffener member and a fifth stiffener member. 25
[0012] In an embodiment, the first stiffener member and the second stiffener member are bent plates coupled to the base frame.
[0013] In an embodiment, the first stiffener member and the second stiffener member have equal dimensions and an angle of bend of 90o.
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[0014] In an embodiment, the bottom wall comprises at least one slot, wherein the at least one slot includes a first slot, a second slot, a third slot, a fourth slot, a fifth slot, and sixth slot.
[0015] In an embodiment, the bottom wall comprises at least one protrusion, wherein the at least one protrusion includes a first protrusion, a second protrusion, 5 a third protrusion, a fourth protrusion, and a fifth protrusion.
[0016] In an embodiment, the first protrusion, the second protrusion, the third protrusion extend between walls of the continuous side wall perimeter. The fourth protrusion is disposed between the first protrusion and the second protrusion, and the fifth protrusion is disposed between the second protrusion and the third 10 protrusion.
[0017] In an embodiment, the first slot is provided at one end of the first protrusion, and the second slot is provided at another end of the first protrusion, wherein the third slot is provided at one end of the second protrusion, and the fourth slot is provided at another end of the second protrusion, wherein the fifth slot is 15 provided at one end of the third protrusion, and the sixth slot is provided at another end of the third protrusion.
[0018] In an embodiment, the third stiffener member, the fourth stiffener member and the fifth stiffener member disposed underneath the bottom wall partly extends through the at least one slot towards top side of the bottom wall and are 20 coupled to the base frame.
[0019] In an embodiment, at least portion of each of the third stiffener member, the fourth stiffener member and the fifth stiffener member are interposed between the at least one bottom cover member and lower side of the bottom wall.
[0020] In an embodiment, each of the third stiffener member, the fourth stiffener 25 member and the fifth stiffener member snugly fits into each of the first protrusion, the second protrusion, the third protrusion.
[0021] In an embodiment, in the assembled condition, the base frame is interposed between the continuous side wall perimeter, the bottom wall and the top wall. 30
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[0022] In an embodiment, each of the at least one stiffener member is made of steel.
[0023] In an embodiment, each of the at least one bottom cover member is made of fiber reinforced polymer.
[0024] Other features and aspects of this disclosure will be apparent from the 5 following description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 illustrates a perspective view of a railway coach car, according to an embodiment of the present invention;
[0026] Figure 2 illustrates a view of a railway coach seat disposed within the 10 railway coach car, according to an embodiment of the present invention;
[0027] Figure 3 illustrates exploded view of the railway coach seat, according to an embodiment of the present invention;
[0028] Figure 4 illustrates a view of a seat frame assembly of the railway coach seat, according to an embodiment of the present invention; 15
[0029] Figure 5 illustrates a view of a base frame of the seat frame assembly, according to an embodiment of the present invention;
[0030] Figure 6 illustrates a view of an exterior tray assembly of the seat frame assembly, according to an embodiment of the present invention;
[0031] Figure 7 illustrates cross sectional views of an exterior tray assembly of 20 the seat frame assembly, according to an embodiment of the present invention;
[0032] Figure 8 illustrates different views of the exterior tray assembly and stiffener members, according to an embodiment of the present invention; and
[0033] Figures 9 illustrates the assembly of the railway coach seat, according to an embodiment of the present invention. 25
[0034] The drawings referred to in this description are not to be understood as being drawn to scale except if specifically noted, and such drawings are only exemplary in nature.
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DETAILED DESCRIPTION
[0035] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided 5 herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0036] It is also to be understood that various arrangements may be devised that, 10 although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0037] The terminology used herein is for the purpose of describing particular 15 embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes” and/or “including,” when used herein, specify the presence of stated features, integers, 20 steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0038] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, 25 two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
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[0039] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context 5 of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0040] Referring to Figure 1, a railway coach car (10) extending in a longitudinal direction “L”, according to an embodiment of the present invention is illustrated. The railway coach car (10) comprises a pair of bogies (12) and a carrier structure 10 (16). The pair of bogies (12, 14) includes a first bogie (12) and a second bogie (14). The carrier structure (16) disposed on the pair of bogies (12, 14). The carrier structure (16) comprises a plurality of railway coach seats (100) configured to seat for seating passengers in the carriage. The description, arrangement and working of the bogies are well known in the art and are therefore not described in detail herein. 15
[0041] Referring to Figure 2, the plurality of railway coach seats (100) are mounted to panels (18) extending from walls (20) of the carrier structure (16). In the illustrated example, only two railway coach seats (100) are being depicted. However, the carriage structure (16) can have multiple railway coach seats (100), without any limitations. 20
[0042] For the sake of brevity, only one of the railway coach-seat (100) is being described in detail herein. However, the description is equally applicable to all the railway coach seats (100) disposed within the carrier structure (16), without limiting the scope of the invention.
[0043] Referring to Figures 3, and 4, the railway coach seat (100) comprises a 25 cushion pad (101) and a seat frame assembly (102). The cushion pad (101) is detachably coupled to the seat frame assembly (102). The cushion pad (101) comprises at least one polyurethane pad, a wire frame, and a seat trim disposed on upper side of the at least one polyurethane pad. The description, arrangement and
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working of the cushion pads are well known in the art and are therefore not described in detail herein.
[0044] Referring to Figures 4 and 5, the seat frame assembly (102) comprises a base frame (103) made of first material and an exterior tray assembly (104) made of second material. In the illustrated example, the exterior tray assembly (104) 5 encloses at least portion of the base frame (103). In the illustrated example, the first material is metal such as steel. Alternatively, the first material may be selected from one of aluminium, or metal-alloy, without limiting the scope of the invention. In the illustrated example, the second material is fiber reinforced material such as glass fiber reinforced material. Alternatively, the second material may be selected from 10 one of carbon fiber, aramid (Kevlar) fiber and any combination or the like, without limiting the scope of the invention. A thermosetting or thermoplastic resin is preferably used to set the fibers. Preferably, the resin is fire-retardant vinyl ester resin. However, any other suitable resins or adhesives known in the art may be used, including polyester resin, epoxy resin or the like. 15
[0045] The base frame (103) is a D-shaped tube structure having a continuous rectangular hollow section with Length ‘L’, breath ‘B’ and thickness ‘t’. The base frame (103) is fabricated by joining two tubes. The tube is fabricated in such a way that the side with length ‘L’ stays in vertical direction of the seat assembly (102).
[0046] The seat frame assembly (102) further comprises at least one stiffener 20 member (106a, 106b, 106c, 106d, 106e) (shown in Figures 5 & 8). In the illustrated example, the at least one stiffener member (106a, 106b, 106c, 106d, 106e) comprises five stiffener members including a first stiffener member (106a), a second stiffener member (106b), a third stiffener member (106c), a fourth stiffener member (106d) and a fifth stiffener member (106e). Alternatively, the at least one 25 stiffener member (106a, 106b, 106c, 106d, 106e) may include one or more than stiffener member, without limiting the scope of the invention. In the illustrated example, each of the at least one stiffener member (106a, 106b, 106c, 106d, 106e) is made of steel. Alternatively, at least one stiffener member (106a, 106b, 106c,
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106d, 106e) may be selected from one of aluminium, or metal-alloy, without limiting the scope of the invention.
[0047] The first stiffener member (106a) and the second stiffener member (106b) are bent plates coupled to the base frame (103) (shown in Figure 5). The first stiffener member (106a) and the second stiffener member (106b) have equal 5 dimensions and an angle of bend of 90o. In the illustrate example, the first stiffener member (106a) and the second stiffener member (106b) are welded to short edges the base frame (103). Alternatively, the first stiffener member (106a) and the second stiffener member (106b) may be coupled to the base frame (103) via, fastening members, adhesives, without limiting the scope of the invention. 10
[0048] Referring to Figures 4, 6, and 7, the exterior tray assembly (104) comprises a continuous side wall perimeter (112) and a bottom wall (114). The continuous side wall perimeter (112) is a double walled structure (W1, W2) having a gap (WGAP) therein between (as shown in Figure 7). The bottom wall (114) comprises at least one protrusion (118a, 118b, 118c, 118d, 118e). In the illustrated 15 example, the at least one protrusion (118a, 118b, 118c, 118d, 118e) comprises five protrusions (118a, 118b, 118c, 118d, 118e) including a first protrusion (118a), a second protrusion (118b), a third protrusion (118c), a fourth protrusion (118d), and a fifth protrusion (118e). Alternatively, the at least one protrusion (118a, 118b, 118c, 118d, 118e) comprises one or more than one protrusion, without limiting the 20 scope of the invention.
[0049] The first protrusion (118a), the second protrusion (118b), the third protrusion (118c) extend between walls of the continuous side wall perimeter (112). The fourth protrusion (118d) is disposed between the first protrusion (118a) and the second protrusion (118b), and the fifth protrusion (118e) is disposed between the 25 second protrusion (118b) and the third protrusion (118c).
[0050] Referring to Figures 6 and 8, the bottom wall (114) comprises at least one slot (116a, 116b, 116c, 116d, 116e, 116f). In the illustrated example, the at least one slot (116a, 116b, 116c, 116d, 116e, 116f) comprises six slots (116a, 116b, 116c, 116d, 116e) including a first slot (116a), a second slot (116b), a third slot (116c), a 30
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fourth slot (116d), a fifth slot (116e), and sixth slot (116f). Alternatively, the at least one slot (116a, 116b, 116c, 116d, 116e, 116f) comprises one or more than one slot, without limiting the scope of the invention.
[0051] The first slot (116a) is provided at one end of the first protrusion (118a) (shown in Fig. 6 & 8), and the second slot (116b) is provided at another end of the 5 first protrusion (118a) (shown in Fig. 6). The third slot (116c) is provided at one end of the second protrusion (118b) (shown in Fig. 6 & 8), and the fourth slot (116d) is provided at another end of the second protrusion (118b) (shown in Fig. 6 & 8). The fifth slot (116e) is provided at one end of the third protrusion (118c) (shown in Fig. 6 & 8), and the sixth slot (116f) is provided at another end of the third 10 protrusion (118c) (shown in Fig. 6 & 8).
[0052] Referring to Figure 8, the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) are disposed underneath the bottom wall (114). Each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) have bent 15 portions at the ends. The bent portions of the third stiffener member (106c) partly extends through the first slot and second slot (116a, 116b), the bent portions of the fourth stiffener member (106d) partly extends through the third slot and fourth (116c, 116d), and the bent portions of the fifth stiffener member (106e) partly extends through the fifth slot and sixth slot (116e, 116f) towards top side of the 20 bottom wall (114). Each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) snugly fits into each of the first protrusion (118a), the second protrusion (118b), the third protrusion (118c) respectively.
[0053] The bent portions of the third stiffener member (106c), the fourth stiffener 25 member (106d) and the fifth stiffener member (106e) partly extending through the at least one slot (116a, 116b, 116c, 116d, 116e, 116f) towards top side of the bottom wall (114) are coupled to the base frame (103) disposed within the exterior tray assembly (104) (during assembly). In the illustrated example, the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member 30
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(106e) are welded to the base frame (103). Alternatively, the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) may be coupled to the base frame (103) via fastening members or adhesives, without limiting the scope of the invention.
[0054] The exterior tray assembly (104) further comprises at least one bottom 5 cover member (108a, 108b, 108c) (shown in Figure 9) secured to lower side of the bottom wall (114) such that at least portion of each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) are interposed between the at least one bottom cover member (108a, 108b, 108c) and lower side of the bottom wall (114). Each of the at least one bottom cover member 10 (108a, 108b, 108c) is made of fiber reinforced polymer such as glass fiber reinforced material. Alternatively, the at least one bottom cover member (108a, 108b, 108c) may be selected from one of carbon fiber, aramid (Kevlar) fiber and any combination or the like, without limiting the scope of the invention.
[0055] The at least one bottom cover member (108a, 108b, 108c) is secured to 15 lower side of the bottom wall (114) and each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) respectively via adhesives. In another example, the at least one bottom cover member (108a, 108b, 108c) is secured to lower side of the bottom wall (114) and each of the third stiffener member (106c), the fourth stiffener member (106d) and 20 the fifth stiffener member (106e) via fastening members, without any limitations. Further, the mating sides of these bottom cover member (108a, 108b, 108c) (with bottom surface of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e)) can be either be completely flat or ribbed or stepped based on the gap between the bottom surface of the third stiffener 25 member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e), and bottom surface of the exterior tray assembly (104).
[0056] The exterior tray assembly (104) also comprises a top wall (113) secured to top side of continuous side wall perimeter (112) (shown in Figure 9). The top wall (113) is made of fiber reinforced polymer such as glass fiber reinforced 30
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material. Alternatively, the top wall (113) may be selected from one of carbon fiber, aramid (Kevlar) fiber and any combination or the like, without limiting the scope of the invention.
[0057] During assembly of the railway coach seat (100) as shown in Figure 9, the base frame (103) along with the first stiffener member (106a) and the second 5 stiffener member (106b) is snugly fit into the exterior tray assembly (104) such that the exterior tray assembly (104) encloses at least portion of the base frame (103) (as shown in Fig. 9-1). Thereafter, the bent portions of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) partly extending through the at least one slot (116a, 116b, 116c, 116d, 116e, 116f) 10 towards top side of the bottom wall (114) are coupled to the base frame (103) disposed within the exterior tray assembly (104) (as shown in Fig. 9-2).
[0058] Thereafter, the top wall (113) is secured to top side of continuous side wall perimeter (112) (as shown in Fig. 9-3). Thereafter, the at least one bottom cover member (108a, 108b, 108c) are secured to lower side of the bottom wall (114) such 15 that at least portion of each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) are interposed between the at least one bottom cover member (108a, 108b, 108c) and lower side of the bottom wall (114) (as shown in Fig. 9-4 & 9-5).
[0059] The present invention relates to the railway coach seat (100) which has 20 both steel and FRP parts so disposed such that it achieves light weight without compromising on its performance (stiffness or strength). The manufacturing process is simple ensuring proper packaging of each part and joining of Steel parts among themselves and also with FRP parts wherever required. The disclosed railway coach seat (100) also provides better travel comfort to the passengers due 25 to better isolation from the rail induced vibrations.
[0060] The fastening members mentioned in the above description, includes nuts and bolts, rivets, screws etc., without limiting the scope of the invention.
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[0061] Furthermore, the terminology used herein is for describing embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or 5 improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0062] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and 10 substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0063] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing 15 from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions, or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art. , Claims:We Claim:
1. A railway coach seat (100) comprising:
a cushion pad (101);
a seat frame assembly (102), wherein the cushion pad (101) is detachably coupled to the seat frame assembly (102), wherein the seat assembly (102) comprises:
a base frame (103) made of first material;
an exterior tray assembly (104) made of second material enclosing at least portion of the base frame (103), wherein the exterior tray assembly (104) comprises:
a continuous side perimeter wall (112) and a bottom wall (114);
a top wall (113) secured to top side of continuous side perimeter wall (112); and
at least one bottom cover member (108a, 108b, 108c) secured to lower side of the bottom wall (114).
2. The railway coach seat (100) as claimed in the claim 1, wherein the first material is metal.
3. The railway coach seat (100) as claimed in the claim 1, wherein the first material is selected from one of Steel, aluminium, or alloy.
4. The railway coach seat (100) as claimed in the claim 1, wherein the second material is fiber reinforced material.
5. The railway coach seat (100) as claimed in the claim 4, wherein the second material is glass fiber reinforced material.
6. The railway coach seat (100) as claimed in the claim 1, wherein the cushion pad (101) comprises at least one polyurethane pad, a wire frame, and a seat trim disposed on upper side of the at least one polyurethane pad
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7. The railway coach seat (100) as claimed in the claim 1, wherein the continuous side perimeter wall (112) is a double walled structure (W1, W2) having a gap (WGAP) therein between.
8. The railway coach seat (100) as claimed in the claim 1, wherein the seat frame assembly (102) comprises at least one stiffener member (106a, 106b, 106c, 106d, 106e), wherein the at least one stiffener member (106a, 106b, 106c, 106d, 106e) includes a first stiffener member (106a), a second stiffener member (106b), a third stiffener member (106c), a fourth stiffener member (106d) and a fifth stiffener member (106e).
9. The railway coach seat (100) as claimed in the claim 8, wherein the first stiffener member (106a) and the second stiffener member (106b) are bent plates coupled to the base frame (103).
10. The railway coach seat (100) as claimed in the claims 8 and 9, wherein the first stiffener member (106a) and the second stiffener member (106b) have equal dimensions and an angle of bend of 90o.
11. The railway coach seat (100) as claimed in the claim 1, wherein the bottom wall (114) comprises at least one slot (116a, 116b, 116c, 116d, 116e, 116f), wherein the at least one slot (116a, 116b, 116c, 116d, 116e) includes a first slot (116a), a second slot (116b), a third slot (116c), a fourth slot (116d), a fifth slot (116e), and sixth slot (116f).
12. The railway coach seat (100) as claimed in the claim 1, wherein the bottom wall (114) comprises at least one protrusion (118a, 118b, 118c, 118d, 118e), wherein the at least one protrusion (118a, 118b, 118c, 118d, 118e) includes a first protrusion (118a), a second protrusion (118b), a third protrusion (118c), a fourth protrusion (118d), and a fifth protrusion (118e).
13. The railway coach seat (100) as claimed in the claim 12, wherein the first protrusion (118a), the second protrusion (118b), the third protrusion (118c) extend between walls of the continuous side perimeter wall (112), wherein the fourth protrusion (118d) is disposed between the first protrusion (118a) and the second protrusion (118b), and the fifth protrusion (118e) is disposed between the second protrusion (118b) and the third protrusion (118c).
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14. The railway coach seat (100) as claimed in the claims 11 to 13, wherein the first slot (116a) is provided at one end of the first protrusion (118a), and the second slot (116b) is provided at another end of the first protrusion (118a), wherein the third slot (116c) is provided at one end of the second protrusion (118b), and the fourth slot (116d) is provided at another end of the second protrusion (118b), wherein the fifth slot (116e) is provided at one end of the third protrusion (118c), and the sixth slot (116f) is provided at another end of the third protrusion (118c).
15. The railway coach seat (100) as claimed in the claim 8 and 14, wherein the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) disposed underneath the bottom wall (114) partly extends through the at least one slot (116a, 116b, 116c, 116d, 116e, 116f) towards top side of the bottom wall (114) and are coupled to the base frame (103).
16. The railway coach seat (100) as claimed in the claim 1 and 15, wherein at least portion of each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) are interposed between the at least one bottom cover member (108a, 108b, 108c) and lower side of the bottom wall (114).
17. The railway coach seat (100) as claimed in the claim 1, wherein each of the third stiffener member (106c), the fourth stiffener member (106d) and the fifth stiffener member (106e) snugly fits into each of the first protrusion (118a), the second protrusion (118b), the third protrusion (118c).
18. The railway coach seat (100) as claimed in the claim 1, wherein in the assembled condition, the base frame (104) is interposed between the continuous side perimeter wall (112), the bottom wall (114) and the top wall (113).
19. The railway coach seat (100) as claimed in the claim 8, wherein each of the at least one stiffener member (106a, 106b, 106c, 106d, 106e) is made of steel.
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20. The railway coach seat (100) as claimed in the claim 1, wherein each of the at least one bottom cover member (108a, 108b, 108c) is made of fiber reinforced polymer.