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ChairChair description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070273190, Chair. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001]The invention relates to a chair with a seat, a base support and a backrest. [0002]Many different chair designs are known in practice. In the so-called three-point mechanism, the seat, the base support and the backrest are coupled together via three articulation points in such a way that a predetermined synchronous relationship is established between the inclination of the seat and the inclination of the backrest. With respect to the location of the pivot point, three-point mechanisms of this type represent a compromise between different ergonomic requirements, which cannot be satisfied independently of one another. [0003]DE-B-103 18 759 describes a two-point mechanism in which the seat is pivotably mounted on the base support with the interposition of a spring system. Furthermore, means are provided for adapting the spring behaviour of this spring member to different requirements. The backrest is connected to the seat via an articulation axis, wherein synchronisation between the inclination of the seat and the inclination of the backrest is rendered possible by means of a cable construction provided between the base support, the seat and the backrest. [0004]A chair which has a two-point mechanism is known from DE-A-43 31 987, wherein the seat is pivotably mounted on the base support and the backrest is pivotably mounted on the seat, and a first spring system is provided between the base support and the seat and a second spring system is provided between the seat and the backrest. The special feature of this chair consists in that the pivoting axis of the seat is provided in the region of the user's ankles, and the pivoting axis of the backrest extends at least approximately through his hip joints. In this arrangement, the pivoting movement of the backrest in relation to the seat is not mechanically coupled to the pivoting movement of the seat in relation to the base support. [0005]The object of the invention is to develop the chair further so that it can be adapted in a simple manner to different requirements, especially to users of different weights. [0006]According to the invention, this object is achieved by the features of claim 1. [0007]The chair according to the invention substantially has a seat, a base support and a backrest, wherein the seat is pivotably mounted on the base support and the backrest is pivotably mounted on the seat, and a first spring system is provided between the base support and the seat and a second spring system is provided between the seat and the backrest, wherein the pivoting movement of the backrest in relation to the seat is not mechanically coupled to the pivoting movement of the seat in relation to the base support. [0008]Furthermore, means are provided for adjusting the spring behaviour of the two spring systems so that the pivotability of the seat in relation to the base support and the pivotability of the backrest in relation to the seat can be adapted to different requirements, especially to users of different weights. [0009]Further developments of the invention form the subject-matter of the sub-claims. [0010]As the pivoting movement of the backrest in relation to the seat is not mechanically coupled to the pivoting movement of the seat in relation to the base support, the two pivoting regions of the chair can be individually adapted to greatly differing requirements. Owing to the elimination of the mechanical coupling between the two articulations, less installation space is required for the chair mechanism and new chair design possibilities are opened up. [0011]According to a preferred embodiment, the first spring system has at least one first spring member and the second spring system has at least one second spring member. Furthermore, the first spring member can co-operate with a first spring mechanism and the second spring member can co-operate with a second spring mechanism. [0012]The means for adjusting the spring behaviour of the two spring systems can be formed by means for adjusting the spring properties of the first and/or second spring member and/or by means for adjusting the first and/or second spring mechanism. [0013]According to an especially advantageous development, the means for adjusting the spring behaviour of the first spring system and the means for adjusting the spring behaviour of the second spring system are coupled together in such a way that the adjustment of the spring behaviour of the one spring system automatically effects adjustment of the spring behaviour of the other spring system. In this case, the two spring systems and the means for adjusting the spring behaviour of the two spring systems can be adapted to one another so that, even for users of different weights, substantially the same synchronous relationship between the inclination of the seat and the inclination of the backrest is rendered possible. [0014]The means for adjusting the spring behaviour of the two spring systems can be formed e.g. by means for adjusting the spring rate and/or the prestress of the first and/or second spring system, wherein the spring member and/or the spring mechanism of the respective spring system are optionally adjustable. [0015]In a further development of the invention, the first spring system has a first spring member and a first spring mechanism co-operating with the spring member, and the means for adjusting the spring behaviour of the spring system are formed by means for adjusting different spring characteristics of the spring system, wherein the spring system is formed so that the spring member is unloaded in the normal position of the chair, also for users of different weights, and in this unloaded starting position of the spring member all the adjustable spring characteristics of the spring system have a common origin. [0016]In a further development of the invention, the seat is pivotable about a first articulation axis and the backrest is pivotable about a second articulation axis, wherein the two articulation axes are arranged so as to be displaceable relative to one another. In this way, the depth of the seat can be adjusted, whereby the seat depth can, in particular, be adapted to the distance between the knee joint and the hip joint in users of different heights. [0017]Further developments and advantages of the invention will be further explained hereinbelow with the aid of the description and the drawings, wherein: [0018]FIG. 1 shows a schematic side view of a chair in an upright normal position; [0019]FIG. 2 shows a side view of the chair in a tilted-back position; [0020]FIG. 3 shows a schematic representation of the two spring systems according to a first embodiment; [0021]FIG. 4a shows a schematic representation of an alternative spring system in the normal position; [0022]FIG. 4b shows a schematic representation of the alternative spring system according to FIG. 4a in the tilted position; [0023]FIG. 5a shows a schematic representation of the two spring systems according to a second embodiment (in the upright normal position); [0024]FIG. 5b shows a schematic representation of the two spring systems according to FIG. 4 in the tilted-back position; Continue reading about Chair... Full patent description for Chair Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Chair patent application. Patent Applications in related categories: 20090289483 - Mobile ergonomic rotating adjustable chair with lumbar support - An apparatus for sitting, including: a keystone assembly which connects various parts of the apparatus; a back that provides support for at least a person's back or shoulders; a floating lumbar support, which provides support for a person's lower back, attached to the keystone assembly; a seat that can adjust ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Chair or other areas of interest. ### Previous Patent Application: Chair Next Patent Application: Angle-adjustable backrest device for a child highchair Industry Class: Chairs and seats ### FreshPatents.com Support Thank you for viewing the Chair patent info. IP-related news and info Results in 0.13373 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , 174 |
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