Device for the side translation of a motor-vehicle seat

Abstract: Description of a device for the side translation of a seat in a motor-vehicle, consisting of two sliding guides (4, 5) placed transversally to the axis of the seat, at least one of said guides being articulated, either directly or indirectly, to the end of a spring element (15) that can be compressed by rotating a control lever (20), so that the stretching of said spring element(15), subsequent to its compression, causes the side translation of said guides (4, 5) which are united between them to form a frame.

Description: The present invention refers to a device for the side translation of a front seat in a motor-vehicle, adapted to make the entrance easier for the passenger. US-A- 4 834 452 describes a device having the features of the preamble of claim 1. It is an object of the present invention to provide an improved device for seats in motor-vehicles. Said object is achieved by means of a device for the side translation of a motor-vehicle seat presenting the characteristics set forth in claim 1. Further characteristics and advantages will become clear from the following description which refers to the appended drawings, provided as non-restrictive example, and in which: figure 1 is a side view of a motor-vehicle seat provided with the device for side translation according to the present invention; figure 2 is a rear view of the device in figure 1; figure 3 is a top view of the device for translation in figure 1 and 2, without the seat; figure 4 is a view of part of the control mechanism of the device in figure 1, the different operating positions being hatched, and figures from 5 to 8 are schemes of the order of the operative phases of the device according to the invention. With reference to the figures, reference number 1 indicates a motor-vehicle seat provided at its lower part with a frame 2 which is intended to allow its longitudinal translation inside the motor-vehicle. Between the frame 2 and the floor of the body 3, and fixed to the body itself, there is the side translation device according to the invention. It consists of two sliding guides 4 and 5, made of two channels which are inserted the one into the other and slide mutually. The external channels 7 and 8 are fixed to the frame 2 of the seat 1, while the internal channels 9 and 10 are connected the one to the other by means of two arched cross members 12 and 13, in order to form a rigid quadrilateral frame, which is fixed to the body and on which the two external channels can slide. A gas-spring 15 of the usual type presents one end 16 articulated to a fixed part of the seat of the frame 2 under it, while its other end 17 is articulated to an end 19 of a control lever 20. Said lever is articulated on an axis 22 which is fixed to a traverse 23 integral with the body 3 of the vehicle in a position which is basically central in relationship to the seat 1, below it. The control lever 20 is adapted for a rotation of at least 180° on its axis 22, under control of a pair of levers 24 and 25, which together with the control lever form a parallelogram. The lever 25, presents one end connected to the lever 24 while the other end is integral to an axis 27 rotating on a support 28 fixed to the body. The rotation of said axis 27 is controlled by a handle 30, connected to a pair of cone gears 31 an 32, the one being integral with the handle itself and the other with the axis 27. The translation device works as follows. With reference in particular to figures 5 to 8, in which schemes of the different operation phases are shown, it is possible to observe that the gas spring 15 is connected, in this embodiment, to the external channel 8 of the guide 5, while the control lever 20 is rotatably connected to the support frame of the guides 4 and 5. The guide 4 and the whole operation mechanism of the lever 20 are not represented for sake of simplicity. When the lever 20 is in the position in which it is rotated towards the left side of the person watching it (that is, towards the right side in case the person is sitting on the motor-vehicle seat), the channel 8, and the seat with it, is pushed by the spring 15, which tends to stretch itself, towards the opposite side, that is against the sill of the motor-vehicle. The seat is therefore translated laterally, and in this translated position the centre plane of the seat 2 is moved with respect to the plane passing at the axis of the steering wheel. Once the user is sit (i.e. the driver) he rotates the handle 30 and together with it, thanks to the cone coupling and the levers 24 and 25, the control lever 20, which bend towards the right side (fig. 6) thus compressing the gas spring 15. Afterwards the spring 15 gets stretched (figure 7) and causes the side translation of the seat 1 on the guide 5 (in this scheme) till a stop position (not shown) in which the centre plane of the seat basically corresponds to the plane passing at the axis of the steering wheel. This position of the seat is the very position which allows to drive the car or, in case of a passenger, to seat in the correct position. At the moment of getting off the motor-vehicle, the user can take the handle 30 back to its original position, so that the lever 20 can rotate again towards the left side (fig. 8) thus compressing the gas spring, in order to achieve, by means of its own stretching (fig.5), the translation of the guide 5 and therefore the translation of the seat against the sill. The details of the device above described can be obviously modified by implementing solutions which are already known to the operators, without going beyond the scope of the present invention. The pantograph control system of the lever 20, can be easily replaced by a control using an electrical motor and a gearset to reduce the movement, or the cone coupling 31 and 32, can be made directly on the rotation axis of the lever 20, using a handle with a prolonging axis of proper size. The device here illustrated does not need locking systems for the seat at the opposite final positions, since this is also a function of the spring 15, the size of which will be such that it can keep a minimum pre-charge.

Claims: Device for the side translation of a seat in a motor-vehicle consisting of two sliding guides (4, 5) united between them in order to form a frame and placed transversally to the axis of the seat and connected to it at its lower part, characterised in that at least one of said guides is being articulated, either directly or indirectly, to the end of a spring element (15) that can be compressed by rotating a control lever (20) which is articulated at the other end and pivoted on a fixed part of the motor-vehicle, so that the stretching of said spring element (15), subsequent to its compression, causes the side translation of said guides (4, 5) united to form a frame. Device as claimed in claim 1 characterised in that the spring element is a gas spring of the known type. Device as claimed in claim 1 characterised in that the control lever (20) is operated by means of levers forming a parallelogram. Device as claimed in claims 1 and 3 characterised in that the parallelogram levers are operated by a handle (30) by means of a coupling of cone gears (31, 32). Device as claimed in claim 1 characterised in that the control lever (20) is operated by means of an electrical motor and a gearset to reduce the movement. Device as claimed in claim 1 and 2 characterised in that the gas spring is placed under the guides.

Inventors: LEONE SILVIA, LEONE, SILVIA
Applicants: FIAT AUTO SPA, FIAT AUTO S.P.A.
Application year: 2001
Main classification: B60N2
IPC codes: B60N2