Vehicle seats

Abstract: A seat (10) adapted to accommodate three passengers has a seat cushion (11) and a seat back (12), three headrests (13, 14, 20) are located in juxtaposed relationship along the upper edge (15) of the seat back (12), the central headrest (20) is coupled to a central armrest (25) so that the headrest (20) will retract into the seat back (12) when the armrest (25) is lowered and will be raised so that it extends upwardly from the upper edge (15) of the seat back (12) when the armrest (25) is raised.

Description: The present invention relates to vehicle seats and in particular to the provision of headrests on vehicle seats which may be occupied by passengers sitting three abreast. In conventional five seater saloon, hatchback or estate cars the rear seat is normally only fitted with two headrests. The reason for this is that while the rear seat is designed to accommodate up to three passengers, for the majority of time two or fewer passengers will be accommodated and under such circumstances, the provision of a third headrest would unnecessarily restrict the rearward view of the driver. However, when the third passenger is accommodated on the seat, a central headrest would contribute significantly to the safety and comfort of the third passenger. DE-A-2 253 265 (corresponding to the preamble of claim 1) discloses a rear seat for a vehicle having a central headrest which is interconnected with a central armrest such that, when the armrest is raised the headrest extends upwardly from the upper edge of the seat back and when the armrest is lowered the headrest is pivoted forwardly to a lowered position. JP-A-63170140 discloses a mechanism for moving a headrest vertically between a raised and lowered position, the headrest moving to its raised position on lowering of an armrest and to its lowered position on raising of the armrest. According to the present invention, a seat adapted to accommodate three passengers comprises a seat cushion and a seat back, three headrests being located in juxtaposed relationship along an upper edge of the seat back and an armrest being provided centrally of the seat back, the armrest being selectively movable between a raised position in which it is flush with the seat back and a lowered position in which it divides the seat into two for occupation by two or fewer passengers, the armrest being interconnected to the central headrest such that when the armrest is in its lowered position, the central headrest is lowered and when the armrest is in its raised position the central headrest is raised, characterised in that the central headrest is moved linearly between the lowered position in which it is retracted into the seat back and its raised position in which it extends upwardly from the upper edge of the seat back, a seat belt being provided for the central passenger, an upper mounting for the seat belt being arranged to move with the central headrest. In this manner, when two or fewer passengers occupy the seat the armrest may be lowered to retract the central headrest, so that obstruction of the rearward view is minimised, while the armrest may be raised to accommodate a third passenger, raising the headrest to provide restraint for the third passenger's head to guard against whiplash injuries to the neck in a rear impact or rebound in a front impact accident. The invention is now described, by way of example only, with reference to the accompanying drawings, in which:- Figure 1 is a perspective view of a seat formed in accordance with the present invention, with the armrest down; Figure 2 is a perspective view of the seat illustrated in Figure 1, with the armrest up; Figure 3 is a sectional elevation along the line III-III of Figure 1; and Figure 4 is a sectional elevation similar to Figure 3, of an alternative embodiment of the invention. As illustrated in Figures 1 to 3, a rear seat 10 of a motor vehicle has a seat cushion 11 and a seat back 12. Headrests 13 and 14 are mounted on the upper edge 15 of the seat back 12 in conventional manner, the headrests 13 and 14 being located adjacent opposite ends of the seat back 12. A central headrest 20 is located between headrests 13 and 14. The central headrest 20 is mounted on a stem 21, the stem 21 being attached to a carriage 22 which is slidingly located with respect to the seat back 12 on a pair of parallel guide rails 23. The guide rails 23 are located on either side of a recessed portion 24 of the seat back 12. An armrest 25 is pivotally mounted in the recessed portion 24 of seat back 12, by means of a first pair of links 26. Each link 26 is attached at one end to a different side of the armrest 25, by means of pivot 27 and at the other end to a support bracket 29, by means of pivot 28. Each pair of pivots 27 and 28 are coaxial thereby permitting the armrest 25 to pivot between a lowered position in which it divides the seat into two (as illustrated in Figure 1) and a raised position in which the armrest 25 is flush with the seat back 12 (as illustrated in Figure 2). A pair of second links 30 are attached at one end, one to each side of the armrest 25 by means of pivot 31 and at the other end, to the corresponding end of the carriage 22. The pivot connections 31 are spaced forwardly of pivot connections 27 when the armrest 25 is in its lowered position and the link 30 is dimensioned so that; when the armrest is in its lowered position, the headrest 20 will be retracted fully into the seat back 12 (as illustrated in Figure 1); and when the armrest 25 is moved to its raised position, movement of the armrest 25 will be transmitted via links 30 to the carriage 22 to raise the headrest 20 to a position corresponding to that of headrests 13 and 14 (as illustrated in Figure 2). As illustrated in Figures 1 to 3, an upper mounting 35 for seat belt 36 may also be mounted for movement with the carriage 22 so that the seat belt mounting 35 will move with the headrest 20 from a retracted position to a raised position, when the armrest 25 is moved from its lowered to its raised position. In the embodiment illustrated in Figure 4, the pivots 27 which attach links 26 to the armrest 25, engage in elongate slots 40. In this manner, the armrest 25 may be moved between its lowered and raised position by respectively raising or lowering the edge which is rearmost when in the lowered position. The armrest 25 is retained in its lowered position, by means of a spring loaded detent 41. In this embodiment, the links 30' are attached to the armrest 25 by means of pivots 31' located rearwardly of the pivots 27 when the armrest is in the lowered position, the other ends of links 30' being pivotally connected to the carriage 22. In this manner, as the rearward edge of armrest 25 is raised to move the armrest from its lowered to its raised position, the links 30' will cause the carriage 22 and headrest 20 attached thereto, to move upwardly to its raised position, while as the rearward edge of armrest 25 is lowered to move the armrest 25 to its lowered position, the links 30' will cause the carriage 22 and headrest 20 to move downwardly to its retracted position. Various modifications may be made without departing from the invention. For example, while in the above embodiments, the upper mounting 35 for the seat belt 36 is attached to the carriage 22, a separate linkage may be provided for this purpose so that relative movement to the armrest 25 could be different from that of the headrest 20. The whole assembly may be positively located in the raised position by a detent or interlock device which may possibly be actuated by the pressure of a passenger sitting in the central portion of the seat. The positioning of the pivots relative to the centre of gravity of the armrest, and/or the other parts of the system may also be arranged so that any acceleration/deceleration motion of the car will tend to maintain the system in its set position. Alternatively, or in addition, over-centre toggling of the mechanism, detents, latches or other means may be provided to prevent unintentional movement of the components from either position. Means may also be provided for adjusting the height of the central and/or outer headrests to suit the occupants of the seat. Furthermore, means may be provided for lowering the headrests independently of the armrest, for example when reverse gear is engaged, to improve rearward vision when reversing. Means, for example, mechanical, electromechanical, pneumatic or hydraulic may be provided for assisting movement of the armrest and associated mechanism between its raised and lowered position. Although the above embodiments have been described with reference to the rear seat of a motor vehicle, it will be appreciated that it can be applied to any seat arranged to accommodate up to three passengers.

Claims: A seat (10) adapted to accommodate three passengers comprising a seat cushion (11) and a seat back (12), three headrests (13, 14, 20) being located in juxtaposed relationship along an upper edge (15) of the seat back (12) and an armrest (25) being provided centrally of the seat back (12), the armrest (25) being selectively movable between a raised position in which it is flush with the seat back (12) and a lowered position in which it divides the seat (10) into two for occupation by two or fewer passengers, the armrest (25) being interconnected to the central headrest (20) such that when the armrest (25) is in its lowered position, the central headrest (20) is lowered and when the armrest (25) is in its raised position the central headrest (20) is raised, characterised in that the central headrest is moved linearly between the lowered position in which it is retracted into the seat back and its raised position in which it extends upwardly from the upper edge of the seat back, a seat belt (36) being provided for the central passenger, an upper mounting (35) for the seat belt (36) being arranged to move with the central headrest (20). A seat (10) according to Claim 1 characterised in that the central headrest (20) is mounted upon a carriage (22), guide means (23) being provided to guide movement of the carriage (22) relative to the seat back (12) and links (30; 30') being provided between the carriage (22) and the armrest (25) to transmit movement of the armrest (25) to the carriage (22). A seat (10) according to Claim 2 characterised in that the armrest (25) is pivotally connected to the seat back (12) so that the armrest (25) may be moved from its lowered position to its raised position by upward movement of the front edge of the armrest (25), the link (30) between the armrest (25) and carriage (22) being pivotally connected to the armrest (25) at a position (31) spaced forwardly of the pivotal connection (27, 28) to the seat back (12) when the armrest (25) is in its lowered position, so that as the armrest (25) is moved from its lowered position to its raised position, the pivotal connection (31) between the armrest (25) and the link (30) connected to the carriage (22) will move above the pivotal connection (27, 28) of the armrest (25) to the seat back (12), thereby raising the carriage (22) and headrest (20) attached thereto. A seat (10) according to Claim 1 or 2 characterised in that the armrest (25) is pivotally connected to the seat back (12), so that it may be moved from its lowered position to its raised position by moving the rearward edge of the armrest upwardly, the pivotal connection (27) between the armrest (25) and seat (10) engaging in an elongate slot (40) so that the armrest (25) may be moved relative to the pivotal connection (27), and the pivotal connection (31') between the armrest (25) and the link (30') connecting the armrest (25) to the carriage (22) being positioned rearwardly of the pivotal connection (27) between the armrest (25) and seat back (12). A seat (10) according to any one of Claims 1 to 4 characterised in that the upper mounting (35) for a seat belt (36) is interconnected with the armrest (25) so that the mounting (35) will move from a retracted position when the armrest (25) is in its lowered position to a raised position when the armrest (25) is in its raised position. A seat (10) according to any one of the preceding claims characterised in that means is provided to prevent unintentional movement of the components (20, 25, 35) from either their raised or lowered position. A seat (10) according to any one of the preceding claims characterised in that means is provided for preventing lowering of the components (20, 25, 35) when the central portion of the seat (10) is occupied. A seat (10) according to any one of the preceding claims characterised in that means is provided to assist movement of the armrest (25) and headrest (20) between their raised and lowered positions. A seat (10) according to any one of the preceding claims characterised in that means is provided for adjusting the height of the central headrest (20) when the armrest (25) is in its raised position.

Inventors: THOMAS ALAN VAUGHAN, THOMAS, ALAN VAUGHAN
Applicants: JAGUAR CARS, JAGUAR CARS LIMITED
Application year: 1993
Main classification: B60N2
IPC codes: B60N2, B60R22, A47C7