Bed arrangement in the rear area of a vehicle compartment

Abstract: A vehicle seat (8) comprises a backrest (7) which consists of an upper and a lower backrest part (14,15). The lower backrest part (15) is connected in an articulated manner both to a seatpart (9) and to the upper backrest part (14). By swinging the lower backrest part (15) forwards in the longitudinal direction of the vehicle and the upper backrest part (14) backwards in the longitudinal direction, the vehicle seat (8) is converted into part of a bed.

Description: The present invention relates to a bed arrangement in the coupé area of a vehicle, comprising vehicle seats which can be converted into a bed and which each comprise a seat part and a backrest connected to the latter. The maximum length of a lorry with trailer is limited by law. In order to obtain as great a loading length as possible within the limited length, developments are moving in the direction of ever shorter cabs. However, as the cabs are being made shorter, the space in the cab which can be used for a bed, on which the lorry driver can rest between his work shifts, is also reduced. Since there is less and less space for a bed in the cab, greater requirements are placed on the designing of the bed, since the latter must, on the one hand, be sufficiently wide to allow the driver to take up a comfortable rest position and must, on the other hand, be designed in such a way that it does not limit the driver's freedom of movement during his work shift. European Patent Application EP-A-0 36758 discloses a relatively compact bed arrangement according to the preamble of claim 1. The arrangement comprises three bed cushions, of which one bed cushion is pivotably arranged between an upper and a lower position on the rear wall of the cab, while the two other bed cushions are arranged on the rear side of the backrests of the driver's seat and the passenger seat respectively. The bed cushions are arranged so that they form an integral bed when the backrests of the seats are folded forwards towards the instrument panel of the vehicle and at the same time the bed cushion arranged on the rear wall of the cab is in its lowered position. The bed arrangement is certainly relatively compact and saves space, but it has a number of disadvantages. First, the bed cushions on the backrests limit the adjustment range of the seats. The limitation of the adjustment range is particularly noticeable in the case of the passenger seat since, for reasons of comfort, the latter should be displaceable in the longitudinal direction over a greater distance than the driver's seat is displaceable, and since its backrest, again for reasons of comfort, should be pivotable backwards to a greater degree than the backrest of the driver's seat. Second, it is difficult to use the bed arrangement in so-called cab-over-engine vehicles. Indeed, in these, an engine cowl covering the engine protrudes into the coupé area. Therefore, in order to use the bed arrangement, it is necessary for the seat parts of the seats to be raised, each time the bed arrangement is used, from a previously adjusted position, suitable from a driving and comfort point of view, to a relatively high position in which the integral bed is able to extend over the engine cowl. Thereafter, when the bed is converted into vehicle seats, it is once again necessary to find the suitable vertical position for the seats. The aim of the present invention is to eliminate the abovementioned disadvantages. To this end, the invention is characterized in that the backrest comprises an upper and a lower backrest part, in which respect the lower backrest part is connected in an articulated manner to the seat part via a first articulation member, and is connected in an articulated manner to the upper backrest part via a second articulation member, in that the second articulation member is designed to permit pivoting of the upper backrest part relative to the lower backrest part between a first position, in which the backrest parts are essentially in line with each other and form an integral backrest, and a second essentially horizontal position, in which the upper backrest part constitutes part of the bed, and in that the second articulation member comprises at least one locking member for securing the position of the backrest parts relative to each other in at least the first position. The arrangement according to the invention allows the driver to take up a comfortable rest position and is designed in such a way that it does not limit the driver's freedom of movement during his work shift. When using the arrangement, there is no need for bed cushions or the like, which limit the adjustment range of the vehicle seats. In addition, since the articulation member between the two backrest parts is situated relatively high in the backrest, it is also possible to convert the vehicle seats into a bed without changing a previously adjusted position, suitable from a driving and comfort point of view, in order to ensure that the bed extends over the engine cowl covering the engine in cab-over-engine vehicles. In an advantageous embodiment of the invention, when the vehicle seats are converted to a bed, the lower backrest part is swung forwards in the longitudinal direction of the vehicle by means of the first articulation member, and at the same time the upper backrest part is swung backwards in the longitudinal direction of the vehicle by means of the second articulation member. Since the lower backrest part is folded forwards when the upper backrest part is folded backwards, on account of the resulting bed of Z-shaped profile, an extremely stable bed arrangement is obtained. In addition, again on account of the Z-shape, it is possible to move the vehicle seats relatively far backwards in the coupé area before they are converted into a bed. This results in a relatively large space in front of the bed, which increases comfort in the coupé area when the bed is being used. Other features characterizing the invention will emerge from the subsequent patent claims. The following description of an embodiment illustrates the invention. In the description, reference is made to the attached figures, of which Figure 1 shows a diagrammatic side view of a vehicle cab equipped with a bed arrangement according to the invention, Figure 2 shows a front view of the arrangement according to the invention, Figure 3 shows a diagrammatic view I of the backrest shown in Figure 1 when its cushions are removed, Figure 4 shows a diagrammatic view II of the arrangement according to the invention shown in Figures 2 and 3, when the upper backrest part is in the vertical position, and Figure 5 shows a diagrammatic view II of the arrangement according to the invention shown in Figures 2 and 3, when the upper backrest part is in the horizontal position. In Figures 1 and 2, the coupé area 1 of a vehicle cab is shown diagrammatically. The vehicle cab is arranged on top of a conventional framework (not shown) which constitutes part of a vehicle chassis. The cab is provided with a cab floor 2 which separates the coupé area 1 from the vehicle chassis. The cab floor 2, which is designed with an engine cowl 3 projecting into the coupé area 1 and covering a drive unit (not shown) attached to the framework, is connected at its rear to a vertical cab wall 4 which delimits the coupé area 1 to the rear. A board-shaped member, which will be referred to hereinafter as the bed cushion 6, is arranged transversely in the coupé area 1. The bed cushion 6 is pivotably arranged on the cab wall 4 between a vertical stowing position and an essentially horizontal position in which it constitutes part of a bed. In the horizontal position, the bed cushion 6 passes in between the backrests 7 of two vehicle seats 8 situated close to each other. In Figures 1 and 2, the bed cushion 6 is shown by full lines in the vertical position, whereas in Figure 2 it is shown with dot-and-dash lines in the horizontal position. Furthermore, on the cab wall 4 behind each vehicle seat 8, there is arranged at least one support part 5 whose function will be described further below. The two vehicle seats 8 are identical from the standpoint of the invention. Therefore, only the one vehicle seat is described below, it being understood that the description also applies to the other vehicle seat. The vehicle seat 8 also comprises, in addition to the backrest 7, a seat part 9. The seat part 9 is connected to a seat support 10 which bears displaceably on two elongate parallel rails 11 in the cab floor 2. Between the seat support 10 and the rails 11, a conventional, and therefore not shown, locking mechanism is designed to releasably lock the position of the vehicle seat 8 along the rails 11. The backrest 7 comprises an upper and a lower backrest part 14,15. The lower backrest part 15 is connected in an articulated manner to the seat part 9, via a first articulation member 16 extending in the transverse direction of the vehicle, in order to make it possible to fold the backrest 7 forwards or backwards in the longitudinal direction of the vehicle once an actuable locking member has been activated. The first articulation member 16 and its locking member do not constitute part of the present invention and are therefore not described in greater detail. The lower backrest part 15 is connected in an articulated manner to the upper backrest part 14 via a second articulation member 20. The articulation member 20, which is arranged essentially parallel to the first articulation member 16, is designed to permit pivoting of the upper backrest part 14 relative to the lower backrest part 15 between a first position, in which the backrest parts 14, 15 are essentially in line with each other and form an integral backrest 7, and a second essentially horizontal position in which the upper backrest part constitutes part of the bed. Figures 3 to 5 show diagrammatically the supporting parts of the backrest parts 14,15 and the second articulation member 20 after the cushions of the backrest 7 have been removed. In the figures, only those details are shown which are of importance for an understanding of the invention. The upper and lower backrest parts 14, 15 each comprise a U-shaped steel framework. The legs 21 of the steel framework of the upper backrest part partially overlap with the legs 22 of the steel framework of the lower backrest part and are, at their lower part 23, essentially of semicircular form. Along the periphery 24 of the semicircle, teeth 25 are arranged to co-operate with locking members 26 in order to secure the angular position between the backrest parts 14,15 whose common point of rotation consists of a shaft 27 passing transversely through the vehicle seat 8. The two locking members 26 are identical from the standpoint of the invention, for which reason only the one locking member 26 is described below. The locking member 26 consists of a housing 29 designed with flanges 30 through which screws (not shown) extend in order to attach the housing 29 to the leg 22 of the lower backrest part 15. The housing 29 is designed with an internal channel 31 which, at one end, is designed with a gable wall 32 with a continuous hole 33, which constitutes a support surface for an elongate actuating member 34 which is connected (in a manner not shown) to a pin 35 arranged displaceably in the channel 31. The pin 35 is designed at one end with teeth 36, while its other end bears against a compression spring 37 which surrounds the elongate member 34 and bears against the gable wall 32 of the housing. The compression spring 37 exerts a force on the pin 35, which force tends to displace the pin 35 out of the housing 29, in which respect the teeth 36 of the pin 35 are caused to co-operate with the teeth 25 on the semicircular periphery 24, in order to thereby secure the position of the backrest parts 14,15 relative to each other. The teeth 36 of the pin 35 are released from co-operation with the teeth 25 of the semicircular periphery 24 by means of manual actuation of a release mechanism 39 which comprises the previously mentioned elongate member 34, whose one end is connected to the pin 35 and whose other end is designed with a ball head 41 or the like and is accessible in the area of the join 42 between the lower backrest part 15 and the seat part 9. In order to make it possible to actuate both locking members 26 with one single control, i.e. the ball head 41, the lower parts of the actuation members 34 are connected to each other via a shaft 44 passing transversely through the vehicle seat 8. The solution according to the invention has the following function. The adjustment of each vehicle seat from being a seating place to part of a bed is initiated by the locking member of the first articulation member 16 being actuated with one hand, and the backrest 7 then being folded forwards in the longitudinal direction of the vehicle. Thereafter, with the aid of the ball head 41, the elongate actuation member 34 is driven downwards in the longitudinal direction of the backrest 7. When the actuation member 34 is driven downwards, the pin 35 movable in the axial direction is displaced in such a way that co-operation between the teeth 36 of the pin 35 and the teeth 25 of the semicircular periphery 24 ceases. When the locking co-operation between the teeth 36,25 has ceased, the upper backrest part 14 is folded backwards in the longitudinal direction of the vehicle and takes up an essentially horizontal position, in which it bears against the support parts on the cab wall 4. When the upper backrest part 14 has taken up a horizontal position, the ball head 41 is released and the compression spring 37 displaces the pin 35 towards the semicircular periphery 24 and, thereafter, the teeth 36,25 are brought back into locking co-operation with each other. After the backrests 7 of the vehicle seats 8 have been converted to parts of a bed, the bed cushion 6 pivotably arranged on the cab wall 4 is pivoted from the vertical stowing position to an essentially horizontal position between the vehicle seats 8 and forms, together with the upper backrest parts 14, an integral bed. The invention should not be regarded as being limited by the described embodiment, but can be modified within the scope of the subsequent patent claims in a number of alternative embodiments. With the exemplary embodiment described, it is possible to secure the backrest parts in any arbitrary angular position relative to each other. However, it is also possible, without departing from the inventive concept, to design the locking member in such a way that it only secures the angular position between the parts when these are essentially in line with each other and form an integral backrest. In order to obtain a bed which is essentially as long as the cab is wide, it is possible to complete the described bed arrangement with one or more board-shaped bed cushions. An example of this is shown in Figure 2. A relatively short bed cushion 12 is pivotably arranged on the cab wall between a vertical stowing position and an essentially horizontal position. In the horizontal position, the bed cushion passes in between the one vehicle seat and the side wall of the cab and constitutes an extension of the bed. It is of course possible to arrange a corresponding bed cushion for the other vehicle seat. In the exemplary embodiment, bed cushions are used in combination with vehicle seats in order to obtain a sufficiently long bed. It is of course possible to position sufficiently wide vehicle seats close to each other so that these themselves form a sufficiently long bed. In the exemplary embodiment described, two separate members are actuated in order to make it possible to swing the lower backrest part forwards in the longitudinal direction of the vehicle and the upper backrest part backwards in the longitudinal direction. It is of course possible to integrate the members with each other so that a single member is actuated in a first direction in order to swing the lower backrest part forwards, but is actuated in another direction in order to swing the lower backrest part backwards.

Claims: Bed arrangement in the coupé area of a vehicle, comprising vehicle seats (8) which can be converted into at least a part of a bed and which each comprise a seat part (9) and a backrest (7) connected to the latter, characterized in that, for each seat, the backrest (7) comprises an upper and a lower backrest part (14,15), in which respect the lower backrest part (15) is connected in an articulated manner to the seat part (9) via a first articulation member (16), and is connected in an articulated manner to the upper backrest part (14) via a second articulation member (20), in that the second articulation member (20) is designed to permit pivoting of the upper backrest part (14) relative to the lower backrest part (15) between a first position, in which the backrest parts (14,15) are essentially in line with each other and form an integral backrest (7), and a second essentially horizontal position, in which the upper backrest part (14) constitutes part of the bed, and in that the second articulation member (20) comprises at least one locking member for securing the position of the backrest parts (14,15) relative to each other in at least the first position. Bed arrangement according to Claim 1, characterized in that, when each vehicle seat (8) is converted into part of the bed, the lower backrest part (15) is pivoted forwards in the longitudinal direction of the vehicle by means of the first articulation member (16), and at the same time the upper backrest part (14) is pivoted backwards in the longitudinal direction of the vehicle by means of the second articulation member (20). Bed arrangement according to Claim 2, characterized in that the upper backrest part (14) in the folded-back position bears against at least one support part(5) arranged in the vicinity of a rear wall (4) delimiting the coupé area. Bed arrangement according to Claim 1, characterized in that the first and the second articulation members (16,20) are arranged essentially parallel to each other and extend in the transverse direction of the vehicle. Bed arrangement according to Claim 1, characterized in that the upper backrest parts (14) of the vehicle seats in the horizontal position constitute an integral bed surface together with at least one board-shaped member (6). Bed arrangement according to Claim 5, characterized in that the upper backrest parts (14) constitute an integral bed surface together with two board-shaped members (6), in which respect one board-shaped member (6) is arranged to pass in between two vehicle seats (8) situated close to each other, while the second board-shaped member is arranged to pass in between a vehicle seat (8) and a side wall of the coupé area. Bed arrangement according to Claim 5, characterized in that the board-shaped member (6) is pivotably arranged on the rear wall (4) between an essentially vertical stowing position and an essentially horizontal position in which it constitutes part of the bed. Bed arrangement according to Claim 1, characterized in that the locking member (32) is actuated by manual actuation of an actuation member (38) connected to the locking member, in order to release the securing of the upper backrest part (14) relative to the lower backrest part (15). Bed arrangement according to Claim 8, characterized in that the actuation member (38) consists of an elongate member whose one end is connected to the locking member (32) and whose other end is situated close by the join (40) between the lower backrest part (15) and the seat part (9).

Inventors: JOHANSSON ROLF, SJOESTROEM STAFFAN, JOHANSSON, ROLF, SJOESTROEM, STAFFAN, Sjöström, Staffan
Applicants: SAAB SCANIA AB, SAAB-SCANIA AKTIEBOLAG
Application year: 1990
Main classification: B60N2
IPC codes: B62D33, B60N2