CHAIR AND MODE OF WORKING FOR MANUFACTURING THE BACK OF IT

Abstract: A chair having a back (2), an adjustable seat (3), and adjustable supporting devices (5, 6) connected to the back. The back encloses a frame (16) which supports a cushion of synthetic foam (30). The frame (16) is embedded in the synthetic foam (30), which has been injected all around the frame. The back (2) of this chair is firm and yet is easy to produce.

Description: Chair and mode of working for manu acturing the back of it. The invention concerns a chair, at least possessing a back, an adjustable seat connected to it, and adjustable supporting devices connected to the back, of which the back encloses a frame and a cushion of synthetic foam supported by the frame. Such a chair is known from the American patent specification 3-30-4610. In that case the frame is glued from the outside to a prefabricated plate of synthetic foam. The purpose of this invention is to supply a firm and yet easily producable back..To that end the frame of the cushion of the back is embedded in the synthetic foam which is injected all round. The fastening between the synthetic foam and the frame is soiid and is automatically realised. The frame can now be inside the cushion, even so that no hard elements disturb tide resting comfoi't, and so too that the stiff frame is not inconvenient when the chair is carried. The covering wears out considerably less, when there is synthetic foam between covering and rame. The invention concerns and aiao provides a mode of working as is indicated in claim 10. The characteristics of the preferred design, of the chair in accordance with the invention are indicated in claims 2-9. In the now following description the features and further advantages of the chair in accordance with the invention will be specified by means of a drawing. The drawing shows schematically: igures 1 and 2 each a perspective view of a chair in rest position, respectively in carrying position, Figure 3 ~ - perspective view of another chair in accordance with the invention, Figure 4 a broken perspective view of detail IV of figure 3, Figure ~ a cross-section over line V-V of figure 3 and also of a rtiold needed for the construction of a back of the mode of working in accordance with the invention, Figures 7 and 8 variants of figure 6, and Figure ') ■ a cross-section over line IX-IX of fig. 4 The chair 1 of the figures I and 2 principally consists of a Dack 2, a seat 3 and a part for the legs 4 wnich is an adjustable su-.port-fconnected to the back 2, and which is kept in the rest position in an angle a with respect to the Dack 2 by means of a webbing 6. The back 2, the seat 3 and the part for the legs 4 are mutually adjustably connecired, because they are covered by a continuous cover of textile which forms the covering 7• There is a downward fold 8 between back 2 and seat 3, and an upward fold 9 between seat 3 and part for the legs 4. By mutual adjustment as indicated by the arrows lu the chair I can De folded up from the rest position of figure 1 to the folded carrying position of figure 2. The seat 3 has on ane side a loop 11 to carry the chair. Moreover there are binding elements 12 to keep the chair 1 in its folded carrying position. These consist for example of a ribbon or a stringΗrhich are connected to a button, or respectively to a wooden knob 14. The binding elements have been adjusted on the places indicated on the drawing. The chair 15 of figure 3 differs from the chair 1 by the lack of a part for the legs 4. The back 2 is constructed of a square frame 16 of a round aluminium cube with a diameter of for instance 12 mm and4,1 mm thick wall. Two webbings 17 are enclosed, crosswise and diagonally in the frame 16. They are firmly attached to the corner parts 19 of the frame 1ό by means of sewing 18 or rivets with edges. A connecting element 21, which consists of a plate, is soldered to the upper tube 2ϋ of the frame 16. The webbing 6 is attached to the lower tube 23 by means of a stitched..loop 22. This prefabricated frame 16 with webbings 17 and loop 22 is placed in a mold 24- which has the mold parts 25 a^id 2ό. Between these parts there is a hollow form 27. The mold parts 25 and 2ό are held together by means of fastening elements 28. In closed position the webbing 6 sticks out of the hollow form 27. Through an injection-mouthpiece synthetic foam 30 consisting of two components, for example polyethane, should be injected in the hollow form 27. _.o the frame 1o and the webbings 17 are embedded in the synthetic foam 39. The synthetic foam 3 1 - 1 consists of a polyether mixture with a higti molecular weight and a toluylene-diisocyanate-free isocya- nate. The used isocya_ate mixture is a modified .-IDI with an NCO- value of 5.. ± • , as is described in the European patent speci i¬ cation u u22 017 of l.C.I, This isocyanate combination reacts upon .-m activated polyether mixture with an OH-value of !-υ _+ 2 mg KUH/g and is sold by X.G.I, under the code PόA 36- 0-1. So a firm fastening between frame 1b and synthetic foam 3u « is obtained. After a few minutes hardening the mold 24 is opened and the obtained synthetic material, which is later covered with the covering, is removed from it. The back 2, the seat 3 and the part for the legs 4 all have a cushion of synthetic foam with a profile with .vertical edges Nevertheless the covering 7 should be tightly fitted around this profile, for instance by stitching completely through the covering 7 and through the cushion 3 of synthetic foam with a seam 33 of figur 6 or by injecting foam around a webbing 34 of the cushion 43 of synthetic foam 3 U and stitching a webbing 35 *° tke inside of the covering 7- In this case the cover which forms the covering 7 is attached to the cushions 43 in such a way that it can be removed, so that it can be washed easily. In accordance with figure 8 a padding layer 36 is glued to the covering 7 and to a layer of soft synthetic foam 37, which is in turn glued to the synthetic foam 3^ of the cushion 43. After the covering 7 has been adjusted to the back 2, a trapezium-shaped anodised support 5 is adjusted to it, consisting of a bent round aluminium tube, which has on the short side a hinge element 38, while the long side of the tube is an under- support 4-4. In a ρlate*of the hinge element 3^ holes 4ϋ have bean drilled corresponding to the holes 4υ of the connecting element 21. Now the connecting element 21 and the hinge element 3 are connected by means of blind rivets, while the covering ? is in between them. The webbing 6 has ttbutton 46 which, can be inserted into a choseβ number of its : -multiple of button^holes 45, so as to adjust the angle a of the support 5« • The chair 1 can be manufactured by means of a lightweight of for example 3 to 4 kgf. The back 2, which is strenghtened by the frame 1o and the weobing 17, is solid enough to avoid excessive bending. .s/vn ORIGINAL

Claims: CLAIMS 1. Chair (1, 15), at least ossessing a back (2), an adjustable seat ( 3 ) connected to it, and adjustable supporting devices (5) connected to the bacic (2), of which the back (2) encloses a frame ( 16) and a cushion (-4-3) of synthetic foa ( supported by the frame ( lb), Having the characteristic that the frame (l j of the cushion (43) of the back (2) is embedded in the synthetic foam ( 0) which is injected all round. 2. Chair ( l, 15) in. accordance with claim 1, possessing the feature of having at 1 =ast one cushion (43) of synthetic foa (3 ) with vertical edges ( I ) . 3- C lair (1, 15) in accordance with claims 1 or 2, possessing the feature of having a textile covering layer (7) which is sewed to at least one cushion (43) by means of stitches (33) completely penetrating the synthetic foam (30). 4. Chair (1, 15) in accordance with claim 1 or 2, possessing the feature of a textile covering layer (7) which is attached to at least one cushion (43) by means of a webbing (3 , 35). 5. Chair (l, 15) i accordance with one of the preceding clai-iis , possessing the feature that a connecting element ( 1) is attached to the frame ( 16) and that a hinge element (38) of the supporting devices (5) is attached to the connecting element (39) by means of blind rivets ( I- I ) which are pierced through the cove ±nt ~ of the bacic ( ) . u. Chair (l, 15) in accordance with one of the preceding claims, possessing the feature that at least one webbing ( 17) links the opposite parts (14) of the frame ( l ) and is embedded in the synthetic foam ( ' 3 : > ) of the back (2). . Chair (l, 1 ) in accordance w^th one of the preceding cl.-ii =s , posses ing the feature that t'.:o .-ebbin s ( > 7 ) are placed diagonally and crosswise in the frame (lo). 8. Chair (l, I 5) in accordance -ith one ox" the prece<.li.-..g claims, possessing tti.-j feature that the supporting devices consist of a trapezium-shaped support ( ) , of which the snort parallel side is incorporatud in the hin^e _le -lent (3;)) and the long side is an under--.u port (44). W- y. Chair (1, 15) i accordance wit one of c.ie preceding claims, possessing the feature of having a flexi. ue element (6) that liniis the supporting devices (5) to the frame ( lu). lϋ. jode of for the ..anufacturing of a Dacic (2) of a chair (l, 15), which encloses a firaaie ( \ 6 ) and a cushion (43) of synthetic foam ( ju) supported by the rame ( l ) having the characteristic that the frame ( iό) is placed in the hollow form (2 of a mold (24) and that afterwards synthetic foam (3'O is injected into tne hollow forai (-7). BAO ORWlW t

Inventors: DEPPE PETER HEINRICH, WERY ALFONS, DEPPE, PETER, HEINRICH, WERY, ALFONS
Applicants: DEPPE PETER HEINRICH, WERY ALFONS, DEPPE, PETER, HEINRICH, WERY, ALFONS
Application year: 1985
Main classification: A47C9
IPC codes: A47C3, A47C7, A47C9