REPLACEABLE SEAT CUSHION UNIT

Description

Technical field of the invention

[0001] The object of this invention is a seating unit for an armchair, sofa or similar that has an interchangeable cushion, i.e., a cushion that can be housed inside the frame that makes up the seating unit which can be changed at the whim of the user.State of the prior art

[0002] There are many types of sofas on the market with different cushion seats, some harder and some softer. Generally, softer sofa or armchair seats are liked by a wide range of people, but are often overlooked because, with use, these softer seats are more prone to deformation.

[0003] Seats are made up of a cushion made of fibre-lined rubber or a cover filled with fibre, feathers or a combination of rubber and fibre or rubber and feathers. With use, cushions tend to lose their original properties of hardness and resilience. The fillings of these cushions are usually made of a piece of rubber covered with fibre or a kind of duvet made of fibre, fibre and feathers or all feathers. With soft seating options, with use, the covers tend to twist, and the filling deforms.

[0004] The document US20200260880A1 relates to a furniture spring system configured to provide support for different sized modular seating systems and / or modular bed systems. Slats extend between opposing frame or rail members to provide support to the seating or bed system. The slats have a catch disposed at a first or second end. In the seating and / or bed frame systems, the catch engages a retention member to retain the slat to the frame or rail. Adjustable bed frame systems employing such slats comprise modular bed frames and adjustable headboards and foot boards. Bed frames employing the slats and headboards / footboards thereof adjust in length or width in a variety of different manners. Adjustable bed frames adjust through the use of telescoping members, filler blocks and / or elongate end blocks that have different sizes from the standard uniform elongate support blocks employed in a bed frame.

[0005] The objective of the project is to design and build a seat cushion for sofas wherein it is possible for it to be very soft, but which deforms as little as possible, and which can also extend the life of these sofas by allowing the user to exchange the seat core easily and economically. These problems are solved by the seating unit of claim 1.Explanation of the invention

[0006] One object of the invention is an interchangeable seat cushion unit, in such a way that the frame, upholstery and cushion are independent of each other and can be freely interchanged by the user. This object is achieved with the seating unit of claim 1. Preferred features are set out in the dependent claims.

[0007] A further objective of the invention is to achieve an environmentally sustainable seat, so that its useful life can be multiplied simply by replacing the inner core of the cushion, it being possible to offer users a combination of different cores with different construction and hardness.

[0008] The objective of this invention is to build a sustainable seat cushion wherein only the component inside the seat can be easily replaced -i.e., the component that actually deforms with use- in order to enable the useful life of the cushion to be multiplied. To this end, this invention describes a more complex cushion structure, which makes it practically undeformable, wherein the core of the cushion can be easily replaced, while the more expensive and complex part of the seat remains operational for a large number of years.

[0009] To achieve this result, different elements have been combined. So that the replacement core can be removed from the lower part of the cushion without having to remove the upholstery cover. In the construction of the seat, a rubber layer, which is convex shaped on all four sides, has been arranged on the upper part. This layer is lined with fibre and then with a TST or cotton pre-cover. This construction system allows us to introduce different types of cushion cores (fibre, rubber, feather) and that no differences in touch or volume be perceived in the seat between the permanent frame of the cushion, which is practically undeformable, and the interchangeable core introduced.

[0010] From the manufacturer's point of view, the manufacture of a seating unit such as the one claimed in this invention has an obvious advantage, since it is possible to have differentiated storage between seating units. Thus, the manufacturer of this type of seating unit will be able to have a stock of different degrees of hardness, a stock of upholstery with different textures and aesthetic appearances and even a stock of frames. The obvious advantage is the versatility of combining these different elements, as well as the possibilities of converting a traditionally limited element into a consumable with infinite aesthetic possibilities.

[0011] From the user's point of view, the advantage in its use is also disruptive compared to traditional seating units. One can easily interchange the cover and filling of the seat by accessing the rear part thereof without having to remove the cover, multiplying the useful life of the sofa by changing only the core of the seat without having to change the entire seat. In addition, the acquisition cost of these replacements is logically much lower than buying a whole seat.

[0012] Last but not least, it is necessary to highlight the environmental sustainability of the configuration of the seating unit claimed. Indeed, in traditional seating units, any breakage, while changing the cushion, would again only involve replacing that element and not the whole, simplifying, as has been mentioned for the rest of the elements, recycling tasks. Last but not least, the core is fully recyclable without the need to separate subcomponents, as it does not contain a mixture of different raw materials, thus facilitating recycling tasks.Brief description of the drawings

[0013] The following is a very brief description of a series of drawings that help us to understand the invention better and which relate expressly to one embodiment of the invention, which is illustrated as a nonlimiting example thereof. FIG. 1 shows an exploded view of the components of the interchangeable seat cushion unit, which is the object of this invention. FIG. 2 shows an exploded view of the interchangeable compact rubber core, in one practical embodiment of the invention. FIG. 3 shows an exploded view of the interchangeable compact rubber core with a row of internal cut-outs, in another practical embodiment of the invention. FIG. 4 shows an exploded view of the interchangeable compact rubber core with two rows of internal cut-outs, in another practical embodiment of the invention. FIG. 5 shows an exploded view of the interchangeable fibre-filled core with cover. FIG. 6 shows a view of the interchangeable seat cushion unit prior to the insertion of the core (10). FIG. 7 shows a complete view of the interchangeable seat cushion unit. FIG. 8 shows a view of the position of the metal tube (6) to obtain an extra soft seat. FIG. 9 shows a view of the position of the metal tube (6) to obtain a hard seat. Detailed description of a practical embodiment of the invention

[0014] As can be seen in the attached figures, the interchangeable seat cushion unit consists of a frame (1), preferably made of pine wood, board, metal, or combinations thereof. In this frame (1) a plurality of housings has been made configured for the insertion of a plurality of slats (2), strips or bands, which are flexible elements, preferably made of plastic material and which are configured for the suspension of the seat. The slats (2) are elements that are integrated into the construction system of the seat.

[0015] This invention further comprises a surround (3) for the cushion. This surround (3) is a rigid element that perimetrically frames the set of elements that makes up the cushion, as described below. This surround (3) is manufactured, preferably, in a high-density, hard-touch rubber, as it is configured so as not to deform with use, since it must house the core of the seat.

[0016] An essential element of the present invention is the cover (4) of the cushion. This cover (4) is made from foam rubber and is slightly convex-shaped to prevent wrinkles from forming with use. The thickness of the cover (4) is between 10 mm to 60 mm so that the difference between the surround (3) and the core of the cushion is not noticeable.

[0017] Likewise, this invention can incorporate saw-shaped profiles (5) to regulate the hardness. This is an optional element in which a metal tube (6) is incorporated, which allows, depending on its position, to obtain a very soft seat if it is positioned at the edge of the surround (3) or a harder seat if it is positioned near to the centre.

[0018] The metal tube (6) mentioned above has one or two units. The first one is arranged to hold the slats (2) and the second to regulate the hardness of the seat, by inserting it into the saw-shaped profile (5).

[0019] In addition, the invention has a layer of fibre (7) that covers the surround (3), the cover (4) and the frame (1); as well as a removable fabric cover (9) attached with Velcro ®< and an inner protective lining (8) to protect the cushion when the fabric cover (9) is removed.

[0020] Finally, the invention has a core (10) in its cushions that allows different hardness in the same depending on whether they are made in solid form or by means of circular or oval-shaped cuts made therein. Furthermore, said core (10) may be made of a single piece of rubber, of several pieces or by combining said piece of rubber with a fibre piece wrapped in a cotton, polyester, or fibre cover.

Claims

1. An interchangeable seat cushion unit comprising a frame (1) made up of a perimeter structure in which a plurality of transversal slats (2) is arranged, wherein the frame (1) comprises: a plurality of housings configured for the insertion of the plurality of transversal slats (2), strips or bands, which are flexible elements which are configured for the suspension of a seat cushion; a surround (3) that houses a core (10) of the seat inside it, wherein the surround (3) is a rigid element that perimetrically frames the set of elements that makes up the cushion; and wherein the cushion comprises a foam rubber cover (4) with a thickness of between 10 millimetres and 60 millimetres; the interchangeable seat cushion unit being characterized in that it comprises a layer of fibre (7) that covers the surround (3), the foam rubber cover (4) and the frame (1), as well as a removable fabric cover (9) attached with Velcro® and an inner protective lining (8) to protect the cushion when the fabric cover (9) is removed.

2. The interchangeable seat cushion unit according to claim 1 wherein it incorporates saw-shaped profiles (5) arranged to regulate the hardness, in which a metal tube (6) is incorporated to obtain a very soft seat if the metal tube (6) is positioned at the edge of the surround (3) or a harder seat if the metal tube (6) is positioned near to the centre of the seat cushion unit.

3. The interchangeable seat cushion unit according to claim 2 wherein the metal tube (6) has one or two units, wherein the first unit is arranged to hold the slats (2) and the second unit is arranged to regulate the hardness of the seat, by inserting it into the saw-shaped profile (5).

4. An interchangeable seat cushion unit according to claim 1 wherein the plurality of slats (2), strips or bands, are flexible elements made of plastic material.