Chair, in particular office chair
First Claim
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1. A chair comprising:
- a seat top with at least one front seat support arm and at least one rear seat support arm projecting at the underside of the seat top, a seat carrier securely connected to a chair support, a backrest mounted to a backrest carrier which firstly extends rearwardly under the seat top and thereafter upwards, the backrest carrier is connected to the seat carrier by means of a crosswise horizontally extending backrest carrier swivelling joint, and the front seat support arm is articulately connected to the seat carrier through a lever, wherein the rear seat support arm, offset backwards from the backrest carrier swivelling joint, is articulately connected to the backrest carrier by means of a crosswise horizontally extending rear seat joint, a spring arrangement provided under the seat top with the spring arrangement exerting a biasing force upwards upon the seat top and forwardly upon the backrest, said lever connecting the front seat support arm with the seat carrier comprising a two-arm swivelling lever pivotable around a crosswise horizontally extending swivelling axis, and supported at the seat carrier with one lever arm of the swivelling lever articulately connected to the front seat support arm, and with the other lever arm of the swivelling lever connected to a front end of the spring arrangement, and a rear end of the spring arrangement being connected to the backrest carrier at a connection point spaced apart from the backrest carrier swivelling joint.
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Abstract
A chair is provided in which the position and movement of the backrest, which is pivotally carried on a backrest carrier, is effected by movement of the seat top, which, in turn, is subjected to the weight of the seat user. The amount of the user'"'"'s weight differently affects the position of the backrest through the use of pivoting linkages and a tension spring.
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Citations
16 Claims
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1. A chair comprising:
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a seat top with at least one front seat support arm and at least one rear seat support arm projecting at the underside of the seat top, a seat carrier securely connected to a chair support, a backrest mounted to a backrest carrier which firstly extends rearwardly under the seat top and thereafter upwards, the backrest carrier is connected to the seat carrier by means of a crosswise horizontally extending backrest carrier swivelling joint, and the front seat support arm is articulately connected to the seat carrier through a lever, wherein the rear seat support arm, offset backwards from the backrest carrier swivelling joint, is articulately connected to the backrest carrier by means of a crosswise horizontally extending rear seat joint, a spring arrangement provided under the seat top with the spring arrangement exerting a biasing force upwards upon the seat top and forwardly upon the backrest, said lever connecting the front seat support arm with the seat carrier comprising a two-arm swivelling lever pivotable around a crosswise horizontally extending swivelling axis, and supported at the seat carrier with one lever arm of the swivelling lever articulately connected to the front seat support arm, and with the other lever arm of the swivelling lever connected to a front end of the spring arrangement, and a rear end of the spring arrangement being connected to the backrest carrier at a connection point spaced apart from the backrest carrier swivelling joint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification