Chairs and seats – Bottom or back – Framework
Patent
1991-06-24
1993-05-18
Dorner, Kenneth J.
Chairs and seats
Bottom or back
Framework
297458, 297DIG2, 5901, 5653, A47C 702
Patent
active
052116972
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The instant invention relates to an upper seat part made in one piece of a permanently elastic material, with a bottom part and a front part as well as an opposite rear side.
This upper seat part may be a separate item which is placed on a seat. However this upper seat part may also be or become integrated into a seat and is then the upper layer of this seat and is located directly beneath the seating surface. This upper seat part can of course also be covered with another cover, etc.
Such known upper seat parts are generally used to provide softer seating possibilities. This leads necessarily to a situation where ventilation provoked by loading and unloading processes does not occur or occurs only to an insufficient extent so that perspiring and the usual, highly undesirable phenomena occur. Although this disadvantage could be eliminated by making such upper seat parts thicker, this has again the disadvantage of being cumbersome or of giving the seat an unwanted height resulting in insufficient stability. Furthermore a tendency to slide off, especially in a forward direction, is thereby increased.
It is the object of the instant invention to create an upper seat part of the type mentioned providing sufficient aeration (ventilation) during load fluctuations and thus making it possible to be seated without perspiring while at the same time counteracting any tendency to slide off in a forward direction.
This object is achieved through an upper seat part according to claim 1. Advantageous embodiments are described in the subclaims 2 to 5.
A preferred embodiment of the upper seat part according to the invention is described in greater detail below through the schematic drawings in which:
FIG. 1 shows a perspective view of the upper seat part according to the invention and
FIG. 2 shows a side-view of same.
FIG. 3 shows a perspective view of a second embodiment of the upper seat part, and
FIG. 4 shows a side-view of the second embodiment.
The upper seat part according to the invention as shown in FIG. 1 is formed in one piece of a permanently elastic material with a volume weight of 40 to 100 kg/m3. The upper seat part is shown in a state without load and has a bottom element 1 with an approximately rectangular base. It can be especially well seen in FIG. 2 that five ridges 2, 3, 4, 5, 6 running transversely to the seating direction extend upward from the bottom element. The ridges 2, 3 are placed here in the forward area, ridge 4 in the central area and the ridges 5, 6 in the rear area. These ridges are approximately parallel to each other and leave ridge intervals 12 free between them. The left side of the upper seat part shown in the figures represents the front, while the right side represents the back. The expression "seating direction" thus designates the direction going from the rear to the front. The ridges 2, 3 are inclined toward the front and are provided laterally projections 7, 8 at their free ends extending approximately horizontally to the front. The ridges 4, 5, 6 are inclined toward the back and are also provided laterally with projections 9, 10, 11 at their free ends extending approximately horizontally but toward the back. These projections partly cover the ridge intervals 12 and together with the upper free ends constitute a seating surface 13, as can be seen in FIG. 1.
Ridge 2 is provided laterally at its upper free end with a flap-like extension 14 which is bent over to the bottom part 1 so that it is flush with the underside of bottom part 1. Several transversely extending supporting ridges 15 are provided on the inside of this flap-like extension 14, extending into the cavity formed through folding.
When the upper seat part is used the ridges 2, 3, 4, 5, 6 are deformed in the direction of inclination, with ridges 2, 3 producing a force acting forward, and ridges 4, 5, 6 a force acting backwards (toward the back-rest). This produces a force resultant directed to the rear and which counteracts any tendency for the user to slide off forward. Furthermore a certain tension of the
REFERENCES:
patent: 4383342 (1983-05-01), Foster
patent: 4965898 (1990-10-01), So
Forster Peter
Kienlein Kurt
Dorner Kenneth J.
Hope Cassandra
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