SCHIENALE PERFEZIONATO PER SEDIE, POLTRONCINE E SIMILI

Description

P / 16258 "PERFECTED BACKREST FOR CHAIRS, ARMCHAIRS AND THE LIKE" On behalf of: CEDAPLAST srl based in CASTELFRANCO VENETO (Treviso) DESCRIPTION The present invention relates to an improved backrest for chairs, armchairs and the like. Nowadays, office-type chairs are widely used, consisting of a base equipped with swivel wheels from which a column extends, to the upper end of which a plate that supports the seat is fixed. In these types of chairs and armchairs, the seat support plate is usually coupled with an "L" shaped tubular support that holds the backrest. The latter is normally made up of an anatomically shaped plate-like body covered on the support side by a layer of padding. Currently the plate-shaped body is mostly made of plastic and is associated with a fastening device which engages the tubular support and allows the adjustment of the backrest both in height and inclination. It is in fact essential that the chair has structure capable of adapting to physical characteristics That Dr. !ng. ALBERTO BACCHIN of the person who is to use it. For this purpose, the fastening device is normally made up of the coupling of a first component with a second, of which the first is fixed to the plate-like body by means of bolts and has a substantially flat structure from which two appendages develop, corresponding to which the second component is hinged. The latter is conveniently shaped as a hollow body and has two opposing openings aligned along an axis orthogonal to the hinge axis for the insertion of the tubular support with substantially no play. In particular, the tubular support can slide freely inside the seat defined between the first and second component to find the best position for the backrest. A screw with a gripping knob engages a threaded hole in the second component of the fastener so that the end of the screw compresses the surface of the tubular support to block its sliding. In that case component tiltable way, thanks to the hinge constraint of the second compared to the first, the backrest compared to the tubular support. Unfortunately, this technical solution, while ensuring good functioning, it is susceptible to improvements. First of all, the fastening device described is structurally complex to manufacture, considering that it is obtained from sheet metal. In this regard, in fact, very expensive and complex step moulds must be used and it is therefore necessary for the manufacturer to invest large amounts of capital in equipment and production facilities. Furthermore, upon exiting the mould, the two components of the device fixing must be subjected to operations of finishing of the edges. Furthermore during the assembly phase of the backrest, the first component of the fastening device must be fixed to the body plate-like by means of bolts while the second must be hinged to the first, so that the operations to be carried out involve a significant loss of time and a consequent slowdown of the production cycle. In addition to all this, it must be noted that that a considerable amount of material must be used metal to make the two components of the device fixing, so that the final cost of a chair is aggravated. The main task of this invention is to to put in place a perfected backrest for chairs Dr. Eng. AIBEHTO BACCHiN Oalì.rt Cottiteli às Proprietà In'testrijfa No. ó3 — armchairs and similar which solve the above-mentioned drawbacks in the known types. The primary aim of this invention is to develop an improved backrest that can be produced with savings in terms of assembly labor costs compared to traditional backrests. Another important aim of the present invention is to provide an improved backrest for chairs and armchairs whose assembly is simple and can be carried out in a shorter time than the assembly times for traditional chairs. Another important aim of the present invention is to develop an improved backrest which can be obtained in practice by means of equipment and systems which are structurally less complex than traditional ones and by resorting to manufacturing techniques which are inherently notes Another aim of the present invention is to provide a backrest for chairs and armchairs that can be obtained with a smaller number of component parts than known types. Another aim is to develop a backrest for chairs and armchairs that can be obtained with a saving of material compared to the backrests traditional. Another important goal is to create an improved backrest that ensures good adjustment both in height and inclination with respect to the tubular support. The main task, the intended purposes and other purposes which will appear more clearly later, are achieved by an improved backrest for chairs, armchairs and the like, of the type supported by a tubular support and comprising a plate-like body made of plastic material, said backrest being characterised by the fact that from said plate-like body two aligned appendages develop, each equipped with an orthogonal development pin to form a male hinge component, a said backrest being associated with a hollow shaped body, featuring a back and side fins, the section of which is counter-sized to said tubular support and suitable for accommodating its insertion, from said hollow shaped body developing cradle elements to create a component female hinge identifying an engagement seat for said pins along an axis orthogonal to said tubular support, on said back of the shaped body being defined an engagement hole for a screw for fixing ✓ A / of the body to said tubular support. Additional features and benefits of this found will appear more clearly from the description of a preferred embodiment, illustrated for indicative purposes, but not by this means limiting its scope, in the attached tables of drawings in which: - fig. 1 represents a perspective view of a chair equipped with an improved backrest according to the invention; - fig. 2 represents a perspective view of a detail of the backrest in figure 1; - fig. 3 represents a side view of the backrest of figure 1; - fig. 4 represents an exploded view of a detail of figure 2; - fig. 5 represents a view according to a longitudinal section of a detail of figure 4; - fig. 6 represents a view according to a section cross-section of the detail in figure 5. With reference to the figures previously listed, an office chair is generally referred to as reference number 10 and is made up of a base 11 equipped with swivel wheels 12 from which centrally Yes develops a 13 column. The latter is coupled with the end superior a plate, not highlighted in the aforementioned Of seat support 14 and for a tubular support 15 Dr. Eng. ALBERTO BACCHIN Cozudsnti Order in Pronti Indtsirieli - No. 43 — which supports the backrest 17. In this case, the tubular support 15 has a substantially rectangular section with rounded corners 16 and is bent into an "L". Said backrest 17 is made up of a body plate-shaped 18 anatomically shaped to define a concavity and covered, on the support side, by a layer 19 of padding and, on the other side, by a fairing 20. Said plate-like body 18 is made of material plastic and from a central section of its concave face a male hinge component 22 develops monolithically, consisting of two raised appendages 23 aligned and joined in a bridge by a pin 24. On the plate-like body part 18 facing said male hinge component 22 has an opening 25 which, in this case, is rectangular. Said backrest 17 also comprises a shaped body 26 made of stamped metal material which includes, in this case, a portion 27 semitubular consisting of a flat back 28 from which they develop on the sides, fins 29 curves identifying a channel 30 of dimensions section, counter-shaped to the tubular support 15. On the back 28 of said shaped body 26 is defined an internally threaded hole 31. At a certain end of the portion 27 develops, in parallel to each fin 29, a cradle element Said elements to cradle 32 are connected to the other suddenly at bridge 33, which presents development coplanar to the back 28, so as to identify a component female 34 zipper. The latter identifies a location of dimensions counter-shaped to pin 24 and orthogonal development axis and non-interfering with respect to the axis identified by the channel Said shaped body 26 is associated with the body plate-like 18 because, after passing through the opening 25 of the same so as to present the back 28 and the hole 31 facing outwards, the component pin 24 male 22 hinge commits to the identified location, thanks to the two elements cradle 32 from the female component 34. The mating is from the insertion of the support tubular 15 in the canal 30 so that this, passing by under the bridge section 33 of the shaped body 26 serves as locking pin and ensures the engagement of the male component 22 in female component 34 of the / ^ / hinge. .UFF. In this way the shaped body 26 can rotate with respect to Or. Eng. ALBERTO BACCHI*» OrJ^w Itetonele ècl Ca:saìsnH in Pzop.'WJ butafriife - No. « — at pin 24. Said improved backrest 17 also comprises a fixing screw 35, equipped with an adjustment knob 36, the stem 37 of which is conveniently counter-threaded with respect to the hole 31. After having inserted the tubular support 15 into the channel 30 of the shaped body 26, the latter can slide along the support 15 itself in order to correctly position the backrest 17 with respect to the seat 14. Once the desired position has been reached, the shaped body 26 is fixed to the tubular support 15 by inserting and screwing the screw 35 into the hole 31. In practice, it has been found that the present invention has amply satisfied the main task and all the purposes set therefor. In an equivalent construction solution, the male hinge component can consist of two appendages, each of which develops monolithically from the plate-like body and is equipped with a pin that develops orthogonally. Preferably, said plate-like body is obtained by moulding plastic material. It is also important to underline that the shaped body of the improved backrest described in this found is easily obtainable in a single piece of sheet metal printed. In particular, an important advantage is obtained with the present invention due to the fact that it has developed an improved backrest for chairs, armchairs and the like which can be obtained with a reduced use of manpower for assembly compared to traditional types. Another advantage is ensured by this invention in that it has created a backrest for chairs and armchairs whose assembly is practical and quick to complete, with a consequent increase in production capacity. Another important advantage obtained with the present invention is that of having developed an improved backrest which can be obtained with a smaller number of component parts compared to known types. Another advantage is ensured by having created an improved backrest which can be obtained in practice with a notable saving in terms of the quantity of material used compared to traditional backrests; An additional advantage is obtained with this found thanks to having developed a backrest perfected for chairs and armchairs which ensures good adjustment in both height and inclination. All details are replaceable with other elements Or. Eng. ALBERTO BACCHI Ontw Has^i^e ' C'ifJatti ia - No. ¢3 — technically equivalent. in practice, the materials used, as long as they are compatible with the contingent use, as well as the dimensions, can be any depending on the needs. Or. ing. ALBERTO BACCH1N Ord / .tf K / pionelt MC<mus)ot> I ia Prop ali Mutìritfa - No. « -

Claims

CLAIMS 1) Improved backrest for chairs, armchairs and similar of the type supported by a tubular support and comprising a plate-like body made of plastic material, said backrest characterised by the fact that from said plate-like body two aligned appendages develop, each equipped with an orthogonal development pin to form a male hinge component, said backrest being associated with a hollow shaped body, having a back and lateral fins, the section of which is counter-sized to said tubular support and suitable for receiving the insertion thereof, from said hollow shaped body developing cradle elements to create a female hinge component identifying an engagement seat for said pins along an axis orthogonal to said tubular support, on said back of the shaped body being defined an engagement hole for a screw for fixing the body to said tubular support. 2) Backrest, according to the previous claim, characterised in that said two aligned appendages are joined in a bridge by a pin to form said male hinge component. 3) Backrest, according to one of the preceding claims, characterised in that on the part of said plate-like body facing said component Dr. Eng. ALBERTO BACCHI^ Oràin: Kasoatta «W Conta lenses ia Propini laiuttritia — Bp. ffl- An opening is made in the hinge male part which can be passed through by said shaped body. 4) Backrest, according to one or more of the preceding claims, characterised in that said two cradle elements developing from said shaped body are joined by a bridge section developing coplanar to the back of the same. 5) Backrest, according to one or more of the preceding claims, characterised in that each of said cradle elements is open on the side opposite to the one facing said plate-like body. 6) Improved backrest for chairs, armchairs and the like according to one or more of the preceding claims, which is characterised by what is described and illustrated in the attached drawings. By assignment CEDAPLAST srl The Mandatory Dr. Fng. ALBERTO BAC-CHIN Order of the Caautetti and the IndaetrMe Property - No. 43 -