Supports – Resilient support – Including load sustaining bearing or guide
Patent
1994-10-03
1996-02-13
Foss, J. Franklin
Supports
Resilient support
Including load sustaining bearing or guide
248575, 29734416, F16M 1300
Patent
active
054906571
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a seat, in particular a vehicle seat, comprising a spring means whose springing characteristic can be adjusted as desired, wherein the seat has an L-shaped base means with a bottom element and a back element which projects upwardly from the bottom element and a scissor support assembly is disposed on the bottom element.
In seats of that kind, there is often only a relatively small amount of space available for the spring means so that a correspondingly small spring means must be used. However small or short spring means of that kind normally have a hard spring rate, that is to say a hard springing characteristic, which is to be considered disadvantageous.
A seat of the kind set forth above is known from US-A-3 761 045. In that known seat the spring means is disposed in the back element of the base means. The prestressing of the spring means is adjustable so that weight adjustment for the seat is possible. It is also the case with this known seat that a relatively short spring means is usually employed, as a result of the amount of space available for arranging the spring means, and that gives rise to a more or less hard springing characteristic.
FR-A-773 617 shows for example in FIG. 6 a seat having a spring means which is disposed between a vertical back element of a base means, and the seat. The spring means is connected to a flexible element which is guided around a direction-changing roller provided on the seat.
German patent specification No 598 748 discloses a swing saddle which serves as a pillion passenger seat for motorcycles and other vehicles, with tension springs which are disposed beneath the saddle cover and which are fixed by a ball joint-like arrangement at one end to a fixed point on the substructure of the pillion passenger seat and are suspended with the other end on a projection on a pendulum-type lever in notches, adjustably by hand. For the purposes of adjusting the springs while moving the shaft or spindle which rotatably carries the adjustable ends of the springs by means of blocks with bores therethrough has tooth portions which are fixedly connected to the shaft at two locations, the tooth portions in turn engaging into corresponding tooth notches on the two pendulum-type lever projections. There, by displacement of the hand lever, it is possible to effect a pivotal movement of the pendulum-type lever about its mounting axis, whereby the spring means is stressed to a greater or lesser degree and thus the spring characteristic can be adjusted as desired. This however does not involve a seat of the general kind set forth herein.
GB-A-2 169 504 discloses a springing arrangement for a seat or for a seat of the kind set forth in the opening part of this specification, wherein by varying the prestressing of the spring means it is possible to adjust the springing characteristics of the seat as desired. The above-mentioned considerations also apply in regard to this known seat, namely that a relatively short spring means affords a correspondingly hard springing characteristic.
A sprung driving seat for tractors, the seat pan of which is supported relative to the chassis by way of a rocking arm which on the one hand is mounted fixedly to the seat pan and which on the other hand is pivoted to a part which is fixed with respect to the vehicle, and a gas spring disposed between the rocking arm and a part which is fixed with respect to the vehicle, is known from German published specification (DE-AS) No 15 30 670. In that arrangement, pivoted to the underside of the seat pan is an adjusting lever which, at its downwardly facing free end, carries a tension spring arrangement disposed with its other end on a part which is at a higher level and which is fixed with respect to the vehicle, which adjusting lever can be moved into an approximately horizontally forwardly facing position. A pivotal movement of the adjusting lever causes a corresponding linear change in the length of the tension spring arrangement and therewith a linear change in the hardness of the springing char
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Hoerner Josef
Mayer Matthias
Meiller Hermann
Foss J. Franklin
Grammer AG
Lillie Raymond J.
Olstein Elliot M.
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