Chair with hinged backrest
DCFirst Claim
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1. A chair comprising a support structure;
- a seat connected to the support structure by means of a pair of first and second levers having respective first ends hinged to the seat and respective second ends hinged to the support structure, so that the support structure, first and second levers, and seat define a parallelogram system that is able to move the seat between a lowered position and a raised position; and
a backrest hinged to the support structure and operationally connected to the seat so as to be able to pivot between an upright position corresponding to the lowered position of the seat and a reclined position corresponding to the raised position of the seat,characterized in that;
a. the backrest (20) is integral with at least one of the second levers (27);
b. elastic means (42) are associated with the parallelogram system (18, 19, 25,
27) and are designed to hold the backrest (20) elastically in the upright position (A);
c. at least one of the levers (27) has, on the end hinged to the support structure (12), an arm (27b) such that the arm defines with the lever (27) a right-angled lever pivotally mounted on the support structure (12), the elastic means (42) being inserted between the arm (27b) and the support structure (12);
d. a rod (31) is hinged to the arm (27b) of the right-angled lever, which rod is provided with an annular shoulder (31a) facing an associated projection (40) integral with the support structure (12), the elastic means comprises a helical spring (42) coaxial with the rod (31) being arranged between the shoulder (31a) and the projection (40) to render the parallelogram system adjustable.
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Abstract
The chair is provided with a seat connected to a support structure of the chair by means of one or more hinged parallelograms consisting of pairs of tie-rods hinged to the seat and to the support structure. The structure of the chair backrest is integral with at least one of the tie-rods so as to allow the seat to be raised when the backrest is pushed backwards. Provision is also made for elastic means which are designed to counteract the backwards movement of the backrest.
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Citations
13 Claims
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1. A chair comprising a support structure;
- a seat connected to the support structure by means of a pair of first and second levers having respective first ends hinged to the seat and respective second ends hinged to the support structure, so that the support structure, first and second levers, and seat define a parallelogram system that is able to move the seat between a lowered position and a raised position; and
a backrest hinged to the support structure and operationally connected to the seat so as to be able to pivot between an upright position corresponding to the lowered position of the seat and a reclined position corresponding to the raised position of the seat,characterized in that; a. the backrest (20) is integral with at least one of the second levers (27); b. elastic means (42) are associated with the parallelogram system (18, 19, 25,
27) and are designed to hold the backrest (20) elastically in the upright position (A);c. at least one of the levers (27) has, on the end hinged to the support structure (12), an arm (27b) such that the arm defines with the lever (27) a right-angled lever pivotally mounted on the support structure (12), the elastic means (42) being inserted between the arm (27b) and the support structure (12); d. a rod (31) is hinged to the arm (27b) of the right-angled lever, which rod is provided with an annular shoulder (31a) facing an associated projection (40) integral with the support structure (12), the elastic means comprises a helical spring (42) coaxial with the rod (31) being arranged between the shoulder (31a) and the projection (40) to render the parallelogram system adjustable. - View Dependent Claims (2, 3, 4, 5, 6)
- a seat connected to the support structure by means of a pair of first and second levers having respective first ends hinged to the seat and respective second ends hinged to the support structure, so that the support structure, first and second levers, and seat define a parallelogram system that is able to move the seat between a lowered position and a raised position; and
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7. A chair comprising:
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a support structure, a seat, at least one front and one rear lever having respective opposed ends that are pivotally connected to the support structure and the seat, respectively, so as to define with the seat and support structure a parallelogram linkage connecting the seat to the support structure and allowing the seat to be moved between a lowered position and a raised position, a backrest support structure which is rigidly and non-pivotally connected to said rear lever so as to be movable together with said rear lever between an upright position corresponding to the lowered position of the seat and the reclined position corresponding to the raised position of the seat, and spring means associated with at least one of said front and rear levers for biasing the backrest support structure towards its upright position corresponding to the lowered position of the seat. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification