CONSTRUCTIVE ARRANGEMENT INTRODUCED IN ARMCHAIR

Description

1 / 9 CONSTRUCTIVE ARRANGEMENT INTRODUCED IN ARMCHAIR FIELD OF APPLICATION This descriptive report refers to a Utility Model Patent application for an armchair, belonging to the field of furniture articles, particularly furniture for use in offices, homes or other environments, being extremely practical and efficient, meeting the conditions to become worthy of the protection now sought. 002 The constructive arrangement introduced in the armchair, through improvements and the technology employed, aims to develop a functional office armchair with practical mechanisms and actuations, with one of the innovations being efficiency and functionality during use. It consists of a lower support base with lower feet, a seat and backrest with armrests and a headrest. The backrest articulation is done by an articulation mechanism with lever and rack positioning, with spring-assisted return. The footrest articulation is done by a mechanical system using a lever, joints, and a spring for moving the footrest. STATE OF THE ART 003 With the sole and exclusive purpose of providing veracity to the preamble of this description, the applicant will now provide, in the following paragraphs, a brief, yet consistent, explanation of the state of the art regarding the problems and inconveniences existing in an armchair for office use, where it will be possible for a technician in the field to recognize its deficient aspects, in order to subsequently identify... Petition 870240108848, dated 12 / 20 / 2024, page 7 / 29 2 / 9 clearly demonstrates in the invention now claimed the requirement of inventive activity, mandatory under the Industrial Property Law. 004 Several models of office chairs are known on the market, featuring articulations, adjustment mechanisms, fitting systems, among others. These technical diversities are fundamental to ensuring well-being and comfort, combined with ergonomics during use by the user. 005 However, known office chair mechanism models still suffer from several disadvantages and defects. For example, complex and inefficient seat and backrest articulation mechanisms. Impractical footrest actuation and adjustment mechanisms. 006 Furthermore, any prior art office chair arrangements are aesthetically unappealing, and the assembly of the sections or parts requires complex tools and gripping or fastening devices, often demanding special knowledge or techniques for assembling the components. Also, the various parts are usually connected with metal fasteners, requiring additional raw materials and increasing the final cost of the product. 007 The state of the art reveals Brazilian patent PI 0205384-5, titled DEVICE FOR ARTICULATING THE BACKREST OF A SWIVEL CHAIR, WITH A LOCKING POINT, owned by Cerantola do Brasil Ltda, published on 07 / 20 / 2004, which describes a mechanism allowing only the backrest (E) to be reclined and locked in the position desired by the user, thanks to the introduction of a small Petition 870240108848, dated 12 / 20 / 2024, page 8 / 29 3 / 9 articulated U-shaped profile (5), fixed to the base (1) of the chair seat, receiving, at the opposite end, an L-shaped blade (6) that holds and supports the backrest (E), with a return spring with calibration (C) installed in the middle of the piece (5), while a mechanism, formed by two toothed locks, one fixed (8) and the other movable (17), in a ratchet system, are activated by a side lever with shaft (13) and spring (15), allowing the backrest to be locked at any point, determined by the user, within the limits of the travel offered by the cutout (9) of the fixed toothed lock (8), there is also a housing, obtained at the time of stamping the base, hollowing it out from its upper surface through a draw, formed by a lower neck (2) for fitting the end of the chair shock absorber shaft. This system has a completely different constructive arrangement from that proposed in the patent application in question. 008 The state of the art also reveals the Brazilian patent BR 10 2016 017189-0, entitled DEVICE FOR BACKREST ARTICULATION BY CONTACT, owned by Frisokar Equipamentos de Plásticos S / A, published on 06 / 02 / 2018, which describes an articulation mechanism specially designed for auditorium seats (P), receiving components in the parts that compose it, being seat, backrest and side armrests, so that the backrest can be slightly folded back mechanically, according to the manual articulation of the seat by the user when sitting down, being constituted by two backrest articulation pieces (2), equipped with two diagonal slots (4) and (5), and two small Petition 870240108848, dated 12 / 20 / 2024, page 9 / 29 4 / 9 plates (9) with axle (10) and guide pin (11), both fixed to the sides of the arms (1). The backrest (E) has a contact stop (12) at the bottom, and L-shaped profiles (13) equipped with two guide pins (16) and (17), sliding through said diagonal slots (4) and (5). The seat (A), in turn, has an upper stop (18), and also has two L-shaped profiles (19) fixed to each side, which receive the support assembly (22), spring (23) and cover (24), previously fitted into the articulation piece (25), which has an upper arched slot (27) and a central slot (28). This system has a constructive arrangement completely different from that proposed in the patent application in question. 009 In view of the foregoing technical fundamentals, with the passage of time and the accumulation of experience, the facts have pointed towards the construction of unprecedented improvements in office chairs, presenting several advantages over existing ones, being quite practical and efficient, where its unique construction eliminates the negative aspects known in the state of the art, which is presented in this patent. PATENT OBJECTIVE 010 In order to overcome the problems presented, the inventor hereby applies for a Utility Model Patent, entitled CONSTRUCTIVE ARRANGEMENT INTRODUCED IN AN ARMCHAIR, which fundamentally aims at the development of a functional office armchair, with practical mechanisms and actuators, having as one of its innovations efficiency and functionality during use. 011 With many years in the market, and always seeking Petition 870240108848, dated 12 / 20 / 2024, page 10 / 29 5 / 9 innovations and practical solutions to differentiate its products from competitors, the inventor developed this simple and unique armchair mechanism, which is capable of overcoming all the limitations and inconveniences reported in the state of the art, in a practical, efficient and extremely safe way. 012 Thus, due to the considerations pertinent to the state of the art previously discussed, and with the objective of solving such inconveniences pointed out, the constructive arrangement in an armchair is described, with mechanical actuation assisted by springs, free of any electrical system, with a total structure in steel joined by welding and screws, in which it is possible to build each set individually in the production process and form the final product in its assembly by screws. 013 According to the present invention, the invention consists of an armchair composed of a lower support base with lower feet, a seat and backrest with armrests and a headrest. The articulation of the backrest is done by an articulation mechanism with lever and rack positioning, with spring-assisted return. The articulation of the footrest is done by a mechanical system provided by a lever, joints and a spring for movement of the footrest. 014 This is a mechanically operated armchair with spring assistance, free of any electrical system, with a structure made entirely of steel joined by welding and screws, in which it is possible to build each unit individually in the production process and form the final product by assembling it with screws. 015 The armchair uses a gear system in the backrest that has several easy-to-use stopping points. Petition 870240108848, dated 12 / 20 / 2024, page 11 / 29 6 / 9 actuation and locking mechanism. The headrest uses a pressure-locking system. Pressure adjustment is achieved through torque calibration, which allows for easy position adjustment. 017 For the footrest, the mechanism consists of levers and springs that assist in its activation and locking, this being done by a sheet metal support where the central axis has its angle inverted at the moment of locking. With a slight pressure, the force of the axis sometimes assists in the activation, sometimes assists in the locking. This system has a high level of engineering studies to convert mechanical movements, using a lever, into final movements of the product with a footrest system. 018 Its upholstery is made of laminated foam with a layer of soft foam, providing comfort to the user, and its arms, with options for upholstered or wooden finishes, and with the option of PMR arms. 019 It is important to understand that the present Utility Model Patent presented here is illustrated in a demonstrative and non-limiting manner regarding the application of the details, dimensions, capacities, and steps described. It is capable of other modalities and of being practiced or executed in a variety of ways, without departing, logically, from the main inventive scope of the object whose protection is claimed. 020 To complement the present description in order to obtain a better understanding of the characteristics of the present Utility Model Patent and in accordance with a preferred practical embodiment thereof, a set of drawings is attached to the description, where, in an exemplary manner, it is shown. Petition 870240108848, dated 12 / 20 / 2024, page 12 / 29 7 / 9 represented the following: Figure 1 - Perspective view of the assembled armchair; Figure 2 - Perspective view of the armchair's internal structure; Figure 3 - Perspective view of the backrest and seat structure; Figure 4 - Detail of the backrest structure; Figure 5 - Exploded perspective view of the armchair; Figure 6 - Perspective detail of the backrest articulation mechanism; Figure 7 - Perspective view of the seat structure. In this view we can observe the open footrest; Figure 8 - Perspective view of the seat structure. In this view we can observe the closed footrest; Figure 9 - Perspective view of the rods and curved joint of the footrest articulation mechanism; Figure 10 - Perspective view of a side of the lower support base; Figure 11 - Side views of the seat and backrest structure. In this view we can observe the backrest in three different tilt positions; Figure 12 - Side views of the lower base with foot support structure. In this view we can observe the foot support being opened from the closed position to fully open; Figure 13 - Perspective views of the lower base with foot support structure. In this view we can observe the foot support being opened from the closed position to fully open; Figure 14 - Perspective view, as shown in figure Petition 870240108848, dated 12 / 20 / 2024, p. 13 / 29 8 / 9 previous. PREFERRED DESCRIPTION 021 In accordance with the attached drawings, the CONSTRUCTIONAL ARRANGEMENT INTRODUCED IN ARMCHAIR, the subject of this present Utility Model Patent application, constitutes an armchair (P) composed of a lower support base (1), with lower feet (2), seat (A) and backrest (E) with armrests (3) and headrest (4). 022 The armchair (P) has internally a seat structure (5) and a backrest structure (6), mounted on said lower support base (1), which also has a footrest structure (7). 023 The headrest (4) has an M8 hex bolt (8) with a Parlock nut (9). A torque wrench is used to apply the required pressure. 024 The seat structure (5) and backrest structure (6) are joined laterally by a pair of springs (10) and a backrest articulation mechanism (M), the latter fixed to one of the sides of the lower support base (1), consisting of an articulator (11), which has a lower spring (12) fixed to a lower support (13), and a rod (14), with articulation (15), connected to an actuation lever (16) at its opposite end. 025 Next to the backrest structure (6) there is a toothed support (17), rack type, which acts in conjunction with the articulator (11). 026 The foot support articulation mechanism (D) consists of a lever (18) connected to the shaft (19) and has a small articulation support (20) on one side that Petition 870240108848, dated 12 / 20 / 2024, p. 14 / 29 9 / 9 receives a spring (21) fixed to the inner side of the lower support base (1). 027 At the opposite end of the shaft (19), next to the lever (18), there is also a small articulation support (22) connected to a rod (23), the opposite end of which has an articulation (24) that connects the central region of a curved junction piece (25) which has at one end an articulation (26) connected to a fixed lateral support (27) with a stop pin (28). The opposite end of the curved junction piece (25) also has an articulation (29) connected to a second rod (30) which has at its opposite end an articulation (31) connected to the foot support surface (32). 028 Thus constituted, for articulation of the backrest (E) the user only needs to activate the lever (16) releasing the articulator (11) from the toothed rack support (17), thus being able to adjust the inclination according to the pressure exerted on the backrest (E). To lock it, simply release the lever (16) to the initial position. 029 To articulate the footrest (32) in the use position, simply move the lever (18) forward and the mechanism will open the footrest (32). 030 Although one embodiment of the invention has been shown and described, other embodiments may be apparent to those skilled in the art. Therefore, it will be understood that the embodiments shown in the drawings and described above are merely for illustrative purposes and are not intended to limit the scope of the model as defined by the claims that follow. Petition 870240108848, dated 12 / 20 / 2024, page 15 / 29

Claims

1 / 2 CLAIM 1) CONSTRUCTIONAL ARRANGEMENT INTRODUCED IN AN ARMCHAIR, consisting of a functional office armchair, with practical mechanisms and actuations, having as one of its innovations efficiency and functionality during use, characterized by an armchair (P) composed of a lower support base (1), with lower feet (2), seat (A) and backrest (E) with armrests (3) and headrest (4); the armchair (P) has internally a seat structure (5) and a backrest structure (6), mounted on said lower support base (1), which also has a footrest structure (7); the headrest (4) has an M8 hexagonal screw (8) with a Parlock nut (9);The seat structure (5) and backrest structure (6) are joined laterally by a pair of springs (10) and a backrest articulation mechanism (M), the latter fixed to one of the sides of the lower support base (1), consisting of an articulator (11), which has a lower spring (12) fixed to a lower support (13), and a rod (14), with articulation (15), connected to an actuation lever (16) at its opposite end; next to the backrest structure (6) there is a toothed support (17), rack type, which acts in conjunction with the articulator (11); the footrest articulation mechanism (D) is formed by a lever (18) connected to the shaft (19) and which has on one of its sides a small articulation support (20) that receives a spring (21) fixed to the inner side of the lower support base (1);at the opposite end of the shaft (19), next to the lever (18), there is also provided a small articulation support (22) connected to a rod (23), the opposite end of which has an articulation (24), which Petition 870240108848, of 12 / 20 / 2024, page 16 / 29; 2 / 2 connects the central region of a curved junction piece (25) which has at one end a joint (26) connected to a fixed lateral support (27) with a stop pin (28); the opposite end of the curved junction piece (25) also has a joint (29) connected to a second rod (30) which has at its opposite end a joint (31) connected to the foot support surface (32). Petition 870240108848, dated 12 / 20 / 2024, p. 17 / 29

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