EXPANDABLE, STOWABLE VEHICLE SEAT FOR CHILDREN

Abstract: The present invention relates to a vehicle seat comprising a seat section (3) and a back section (4), preferably pivotably arranged in relation to each other, whereby the seat (3, 4) is inwardly and outwardly foldable and in its outwardly folded position the two sections (3, 4) can be arranged in substantially perpendicular positions for use as a seat, or with the two sections (3, 4) in substantially parallel positions for use as an armrest, whereby said seat section (3) is provided with widening means (31, 32; 58; 65, 66) so that the extension of the seat section (3) in the direction of its width can be varied.

Description: Title: Expandable, stowable vehicle seat for children Technical field: The present invention relates to a stowable vehicle seat which is retractably arranged in a base section, whereby said base section preferably constitutes the backrest of a vehicle seat. Background of the invention: Vehicle seats of the type which are stowable and retractably arranged in a base section are previously known. A vehicle seat is previously known from, for example, GB-A-2 167 949 (preamble of claim 1) which comprises a seat section and a back section, preferably pivotably arranged in relation to each other, whereby the seat is inwardly and outwardly foldable and in its outwardly foldable position it can be arranged with the two sections in substantially perpendicular positions for use as a seat, or with the two parts in substantially parallel position for use as an armrest (see also EP-A-258 194) . The above-mentioned document accordingly shows a child cushion (vehicle seat) whose positioning and construction is such that in its outwardly folded position it may also be used as an armrest. A centrally placed inwardly foldable armrest in a vehicle is common. From the above-mentioned documents it is accordingly also known to construct an armrest in such a way that it can be divided and used as a child cushion. Technical problem: The disadvantage with this known combination of vehicle seat and armrest is that the arrangement is relatively cumbersome. The reason for this is that the seat section of a vehicle seat requires a certain width, and which width considerably exceeds the width which is necessary for an armrest. In other words, the known arrangement offers an armrest which considerably exceeds the optimal width for an armrest. Furthermore, the known arrangement also presents disadvantages in its inwardly folded position since its relatively wide width implies that the separation surfaces which delimit the inwardly foldable seat/armrest will intrude on the back-rest section of the seats adjacent this seat such that the comfort of these seats is prejudicially affected. It is an object of the present invention to provide a stowable and outwardly- and inwardly foldable vehicle seat which eliminates the above-mentioned disadvantages though which still maintains these advantages, namely the combination of a vehicle seat and an armrest in one. A further object of the invention is to provide such a child cushion/vehicle seat which in a rational manner offers maximum security and whose production and assembly can be achieved in a rational and thereby cost effective manner. The invention: Said objects are achieved by means of an inwardly foldable vehicle seat in accordance with the invention which is characterized in that the seat section is arranged with expandable means so that the extension of the seat section in the direction of its width can be changed. Brief description of the drawings: The invention will be described in more detail with reference to the embodiments shown in the attached drawings in which Fig. 1 shows a perspective view of a vehicle rear seat with an inwardly foldable vehicle seat according to the invention, Fig. 2 shows a perspective view of a preferred embodiment for widening of the seat section according to the invention, Fig. 3 shows a plan view of a seat section in its widened position according to the principle illustrated in Fig. 2, Figs. 4a-4b are side views of the preferred embodiment of the vehicle seat according to the invention, Fig. 5 shows a second embodiment for achieving widening according to the invention, Figs. 6a-6b shows a third embodiment for achieving widening according to the invention, and Fig. 7 shows the most preferred embodiment relating to the widening of the seat section according to the invention. Best mode of carrying out the invention: The seat shown in Fig. 1 is a rear seat of conventional type with a squab 1, a back-rest 2 and an armrest generally denoted by 3 which in a known manner is supported for pivotal movement between a folded up position (Fig. la) in which it occupies a recess in the back-rest 2, and a folded down position (Fig. lb) in which it can be used as an armrest. In its folded up position (Fig. la) the armrest's underside 30 is planer with the seat's back-rest 2. In its folded down position (Fig. lb) the armresfs underside 30 rests against the squab's 1 upper surface. From the folded down position (Fig. lb) it can be further seen that the armrest consists of a lower part 3 and an upper part 4. A position is shown in Fig. lc in which the armresfs lower part 3 is widened with the help of parts in the seat section 3 which are displaceable sideways. In order to form a vehicle seat, the upper part 4 must now be swung upwardly so that this upper part 4 forms a back-rest for the vehicle seat in accordance with that which is shown in Fig. Id. By adapting the thickness (height) of the seat section 3, a centrally mounted seatbelt 5 can be tensioned in a secure manner around a child sitting on the vehicle seat since the diagonally extending part of the seatbelt can in this manner be adapted to pass over the optimal position of the child's body despite the fact that the seatbelt is primarily intended to be worn by an adult (sitting on the squab) . The principle for the preferred manner in which the widening of the seat section 3 can be arranged is shown in Fig. 2. The figure shows that two side members 31a and 31b are transversally displaceably arranged in relation to a central member 32 within the seat section 3. These members are in the form of square section tubes which are displaceably arranged with respect to each other. The widening of the seat section 3 is possible due to the seat section having an elastic cover 7 and an elastic stuffing 8. The frame members 31, 32 are suitably held in relation to each other in the widen position with help of spring- biased ball bearings (not shown) which snap into corresponding holes in a manner known per se. A plan view of a seat section 3 is shown in Fig. 3 with in principle the same widening system which is shown in Fig. 2, i.e. outer frame members 31 which are transversally displaceably arranged around transversally positioned mid sections 32. For attachment of the seat section a tube-like element 35 extending in the direction of the seat is provided on the innermost of said mid sections 32. In the preferred case the stuffing 8 consists of a substantially non-compressible material such as EPP or other form-stable polymers of low density. In addition the material 8 is divided into two blocks which, in the widened position, create an opening 36 therebetween. The cover is substantially non-elastic and forms preshaped pleats when the seat section 3 is returned to its non-widened position. Fig. 4a shows a side view of a preferred vehicle seat according to the invention in its extended position, i.e. in its position of use. In this position the vehicle seat's seat section 3 is substantially parallelly arranged in relation to the squab 1 of the vehicle seat and the back- rest 4 is locked (not shown locking mechanism) in an upright position so that its rear surface 40 abuts the upper region of the rear seat's back-rest 2. The two seat sections 3, 4 are connected to each other by means of two brackets 6, one on each side, which are fixed to the seat section 3. The back-rest 4 is pivotably arranged on the brackets 6 with the aid of a pivot pin 42. The entire vehicle seat 3, 4 is supported in frame sections to the rear seat 2 with the aid of a second pivot pin 32 whose centerline passes through the seat section 3. The widening arrangement 31, 32 for the seat section 3 depicted in principle in Figs. 2 and 3 is outlined by means of dashed lines within the seat section 3. The vehicle seat is intended to be used together with a three point inertia-reel seatbelt 5 affixed to the rear seat 2. Thanks to the relatively high location of the seat 3, in its fastened state the seatbelt extends in an optimal manner over the body of a child and, similarly, the seat- belt extends optimally over the body of an adult person when sitting on the squab 1. With the intention to optimize safety, a back/neck support 9 is provided along an extension of the back section 40 and is extendable with the help of a displaceable rod 91 by which the rest 9 is positioned on the back section. By means of this displaceable support 9, people (chiefly children) of various height (within limits, up to approximately ten years) are offered maximum support in the event of an accident. A further safety-improving factor is that the seat is dished so that submarining is avoided in a collision. As can be seen from the drawing, the seat 3 is locked in its folded-down raised position without making contact with the squab 1, i.e. with the aid of a position determining mechanism in the vicinity of the support point 44. If the seat is to be converted to an armrest, the back section 4 is simply folded down by swinging it about the pivot point 42 once the lock has been released. Accordingly, in this application, the maximum widening of the seat is not necessary or desirable and so it 3 can be pushed in in order to be as narrow as possible. From this narrowest position it is then possible to swing the entire arrangement to the position which is shown in Fig. 2b. A further widening possibility is shown in Fig. 5 which consists of two outwardly- and inwardly pivotable frame sections 31 which are pivotably arranged about a pivot point 38. In order to guide the forward edge, a tube piece 32 of suitable curvature is provided which passes within said frame sections 31. A second principle for achieving widening of the seat section 3 is shown in Fig. 6a. On each side of a mid section 66 of the seat 3 is arranged a seat section 65a, 65b respectively, pivotable by means of hinge-like devices 67a, 67b. When the pivotable sections (see 65a) of the seats are in their folded out position, their upper delimiting surface forms widening side surfaces adjacent the middle seat section 36 and the downwardly extending region can hereby be arranged to abut the squab 1. In the folded up position (see 65b) , the seat is delimited in its transverse direction by said hinge-like devices 67b and the support regions of the pivotable part 65b are inwardly directed and thereby placed in the vicinity of remaining parts of the seat 66. In contrast to Fig. 6a, Fig. 6b shows that the pivotable seat sections 65 are placed on top of the base section 66 in the folded up position (Fig. 6b2 and 6b3) . Partial Fig. 1 shows the folded up position, 2. the position when it can be used as an armrest, 3. the position where the back-rest is swung upwards and 4. the position of use for the seat with outwardly-folded side pieces 65. The back section 4 is pivotably arranged 42 about a plate or similar (not shown) which is affixed to the base section 66 which, in turn, is pivotably supported 34 to the rear seat 2. By means of a gentle transition 43, the armresfs upper surface changes from a region 40 with a substantially flat and hard surface (which in the folded down position can for example be used as a placement surface and in the raised position rests against the rear seats back section 2) to a region 44 with a soft surface. Fig. 7 shows a seat section 3 comprising a non-widenable base section 70 above which widening means 71, 72 in the form of plate-like elements are slidably arranged. To allow for parallel displacement of the elements 71, 72, each plate is provided with at least two slots 78 which cooperate with at least two peg-like members 76 which are anchored in said base section 70. Each element 71, 72 is outwardly delimited in the sideways direction by a hollow region 74 which serves both as a grip indent (for manual widening) and a seatbelt guide 73. The seat cushion 7, 8 of fabric-covered foam rubber is fixed in the vicinity of each side region 74 so that widening and collapsing can take place without the seat cushion obstructing this movement, suitably with the help of longitudinal seams (not shown) which ensure that the cushion 7, 8 is pleated in an aesthetic manner. In order to receive confirmation that the maximum widening has been achieved, together with its maintenance, each plate-like element 71, 72 is provided with an upwardly-directed depression 79 which cooperates with a spring-biased ball bearing (not shown) or similar arranged in the base section 70. A lock 75 prevents unwanted folding down of the back section 4. The invention is not restricted to that described above but can be varied within the scope of the appended claims. It is for example possible that the guide means 76, 78 described above comprise guide pins which are arranged in transversally (in relation to the seats longitudinal direction) extending slots, whereby each element 71, 72 suitably has at least two guide pins affixed thereto and these guide pins are displaceably arranged in at least two slots in said base section. Furthermore, the invention is not restricted to the use of a back section 4 in accordance with that mentioned above, but it can for example be in the form of a separate part which can be lifted from the seat section to be located in the recess. In an extreme case in which the armrest (collapsed) is very narrow it is possible not to use a back section at all, though this is not preferred from a safety point of view. Finally, it is possible to arrange the back section 4 on a separate displacement mechanism (for example with four degrees of freedom) which can be suitably arranged to swing outwards when the seat section 3 is widened. The widening of the seat section occurs in the preferred case in a manual manner. It is, however, clear for the skilled man that the widening can also occur with assistance, such as with solenoids, electric motors, pressure cylinders etc. Such accessories can suitably be activated by means of a push-button or similar which is either arranged within the seat section 3 and so not accessible in the seat's 3 upwardly folded position or remote from the seat 3 and therefore including means which prevent widening of the seat if the seat is not in its folded down position.

Claims: Claims 1. A vehicle seat comprising a seat section (3) and a back section (4) , preferably pivotably arranged in relation to each other, whereby the seat (3, 4) is inwardly- and outwardly foldable and in its outwardly folded position it can be arranged with the two sections (3, 4) in substantially perpendicular positions for use as a seat, or with the two sections (3, 4) in substantially parallel positions for use as an armrest, c h a r a c t e r i z e d i n, that said seat section (3) is provided with widening means (31, 32; 38; 65, 66; 71, 72) so that the seat section's (3) extension in the direction of its width can be altered. 2. Vehicle seat according to claim 1, c h a r a c t e r i z e d i n, that said widening means (31, 32; 38; 71, 72) is displaceably arranged in a plane which is substantially parallel to the main plane of the seat section (3) . 3. Vehicle seat according to claim 1, c h a r a c t e r i z e d i n, that said widening means (65, 66) is pivotably arranged about an axis (67) which is substantially parallel to the main plane of the seat section (3) and the seat section's longitudinal direction. 4. Vehicle seat according to claim 2, c h a r a c t e r i z e d i n, that said widening means (31, 32) is made up of frame sections slidably arranged for parallel displacement. 5. Vehicle seat according to claim 2, c h a r a c t e r i z e d i n, that said widening means is made up of at least two sections which are pivotably arranged about a point (38) fixed on the seat section (3) . 6. Vehicle seat according to claim 2, c h a r a c t e r i z e d i n, that the seat section (3) includes a non-widenable base portion (70) above which said widening means (71, 72) , preferably in a form of plate-like elements, is slidably arranged, and in that guide means (76, 78) are arranged between said base region (70) and the preferably plate-like elements (71, 72). 7. Vehicle seat according to claim 6, c h a r a c t e r i z e d i n, that said guide means is made up of guide pins which are arranged in transversally extending slots whereby each slidable part has at least two guide pins attached thereto and these guide pins are slidably arranged in slots in said base section. 8. Vehicle seat according to claim 2, c h a r a c t e r i z e d i n, that said inwardly- and outwardly foldable vehicle seat (3, 4) is pivotably mounted by means of a link (34) in a recess within the back section (2) of a conventional passenger vehicle-type seat, whereby a three point safetybelt of inertia-reel type is arranged on the back section (2) at least partially intended for said vehicle seat (3, 4) and that the seat section (3) in its folded down position is maintained at a certain predetermined height above the vehicle's squab (1) without resting on the squab (1) . 9. Vehicle seat according to claim 6, c h a r a c t e r i z e d by a displaceable support element (9) in an extension of the back-rest (4) in the outwardly folded position which allows adaptation of the entire length of the back-rest to users of various sizes.

Inventors: ODE BENGT, SUNDSTEDT PER, ODE, BENGT, SUNDSTEDT, PER
Applicants: VOLVO AB, AB VOLVO
Application year: 1991
Main classification: B60N2
IPC codes: B60N2