Chairs and seats – Movable bottom – Tiltable
Reexamination Certificate
1999-08-11
2001-07-24
Nelson, Jr., Milton (Department: 3624)
Chairs and seats
Movable bottom
Tiltable
C297S327000
Reexamination Certificate
active
06264274
ABSTRACT:
The invention relates to a frame for a seat carrier of a vehicle seat with a left and a right side part and with a left and a right front swivelling prop arm, whereas the left swivelling prop is hinged in the front area of the left side part and the right swivelling prop in the front area of the right side part and whereas an adjusting device is provided by means of which the incline of the two swivelling props may be adjusted.
The allocation in vehicle seats often is that the left couple of rails longitudinally guiding the vehicle seat is located essentially perpendicularly underneath the left side part of the seat carrier, that in the same way, the right couple of rails longitudinally guiding the vehicle seat is located essentially perpendicularly underneath the right side part of the frame for a seat carrier. The arrangement is at least often symmetrical, so that, if there is displacement, it is mirror-inverted on the other side of the seat.
One tries one's best to arrange the couples of rails near the lateral, stiffened areas of the underbody, that means to fasten the couple of rails located outside the vehicle near the swell there or directly on the swell and the couple of rails located inside the vehicle near the tunnel there or directly on the tunnel. This entails that the usual, symmetrical arrangement between the longitudinal guiding and the frame for the seat carrier cannot always be upheld and more particularly that unilateral displacement to the side takes place. The invention is dealing with a seat frame for this instance.
The object of the present invention is to show a seat frame that is suitable for a seat carrier arranged in strong lateral displacement relative to a longitudinal guiding and that foils the mechanical loads occurring due to the unilateral displacement in the easiest possible way.
On the basis of the frame for the seat carrier mentioned above, the solution of the invention is to have one swivelling prop a) arranged on the outer side of the side part to which it belongs, b) hooked out downwards starting from the hinge joint connecting it to this side part, c) stiffened across its plane of motion and d) rigidly connected with the other swivelling prop via a cross tube.
According to the invention the one front swivelling prop is strongly hooked out whereas the other swivelling prop (of the other side of the seat) is not. The strongly hooked out swivelling prop, which is running slantways down and outwards, is stiffened and is arranged on the outer side of the side part to which it belongs. This swivelling prop is essentially taking up the big displacement provided on the corresponding side of the seat relative to the corresponding couple of rails. On the other side of the seat, the displacement is much smaller, for example three to five times as small.
The stiffening confers enough stability on the corresponding front swivelling prop even across its plane of motion. Accordingly, the stiffening is running across its plane of motion. The plane of motion of the swivelling prop is the plane in which it is moving when swivelled around its hinge point on the corresponding swivelling prop.
A certain portion of displacement is already realized by the arrangement of the hooked out swivelling prop on the outer side of the corresponding side part. Since the other side of the seat should have much smaller displacement or no displacement at all, its swivelling prop is preferably hinged on the interior surface of the corresponding side part.
Thanks to the cross tube, the two swivelling props are rigidly connected so as to form a H-shaped unit. Thus, the adjusting forces are simultaneously led on both swivelling props. The cross tube has an additional stiffening effect since lateral forces applying on the hooked out swivelling prop are also transmitted via the cross tube onto the other swivelling prop. Preferably, the cross tube is connected to the swivelling props in the area of the longitudinal centre of the swivelling props.
It proved particularly preferable to have the front swivelling prop located on the outer side of the vehicle provided with the stiffening. The couple of rails on the outer side of the vehicle may thus be displaced quite far to the side and outwards, that means that big displacement may take place between a perpendicular line described by the corresponding swivelling prop and the couple of rails on the outer side of the vehicle.
The mechanical effect of the stiffening is increased by the fact that the stiffening is connected to the cross tube. The cross tube is thus also contributing to increase the lateral stiffness of the stronger hooked out swivelling prop.
The swivelling prop provided with the stiffening and located at the outer side of the vehicle is preferably hooked out at least three times, particularly five times more than the other swivelling prop on the inner or on the outer side of the vehicle. The seat is thus arranged unsymmetrically to the longitudinal guiding. The other swivelling prop is preferably an essentially even part.
It proved preferable to have the cross tube running at an angle of 10 to 30 degrees to the main direction of the stronger hooked out swivelling prop, that means preferably of the swivelling prop located on the outer side of the swivelling prop.
REFERENCES:
patent: 5199679 (1993-04-01), Nakamura et al.
patent: 5284381 (1994-02-01), Aoki et al.
patent: 5310154 (1994-05-01), Ueda et al.
patent: 5626395 (1997-05-01), Aufrere
Becker Burckhard
Beneker Wilfried
Frohnhaus Ernst-Reiner
Cornaby K. S.
Jr. Milton Nelson
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