US 12,376,679 B2
Adjustable chair
Janwillem Bouwknegt, Leiden (NL); and Joseph Elisabeth Oberdorf, Leiden (NL)
Assigned to NPK DESIGN B.V., Leiden (NL)
Appl. No. 18/026,077
Filed by NPK Design B.V., Leiden (NL)
PCT Filed Sep. 14, 2021, PCT No. PCT/NL2021/050557
§ 371(c)(1), (2) Date Mar. 13, 2023,
PCT Pub. No. WO2022/060221, PCT Pub. Date Mar. 24, 2022.
Claims priority of application No. 2026485 (NL), filed on Sep. 16, 2020.
Prior Publication US 2023/0329436 A1, Oct. 19, 2023
Int. Cl. A47C 1/032 (2006.01); A47C 3/025 (2006.01); A47C 3/027 (2006.01); A47C 7/44 (2006.01)
CPC A47C 1/03255 (2013.01) [A47C 1/03288 (2013.01); A47C 3/025 (2013.01); A47C 3/027 (2013.01); A47C 7/448 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A piece of sitting furniture comprising:
a seat;
a backrest;
a base;
wherein the seat and the base are movably coupled for reversible relative adjustment in a seating direction from a first configuration for sitting in an upright posture to a second configuration for sitting in a reclined posture,
wherein the piece of sitting furniture comprises one or more support surfaces and a lever supporting the seat on the base in at least the first and second configurations,
wherein the lever is rotary about a horizontal lever axis transverse to the seating direction and comprises a first support portion defining a first lever arm about the lever axis and a second support portion defining a second lever arm about the lever axis movably engaging the one or more support surfaces at the first support portion and the second support portion, and the one or more support surfaces define a curved path that is curved about the lever axis, such that displacement of the one or more support surfaces relative to the lever axis in the seating direction causes rotation of the lever about the horizontal lever axis,
wherein the lever comprises one or more lever support surfaces defining a curved lever path matching the curved path for supporting the one or more support surfaces along the curved path, and
wherein the one or more support surfaces form a substantially continuous surface along the curved path including the first support portion and the second support portion, and/or
wherein the one or more lever support surfaces form a substantially continuous surface along the curved lever path from the first support portion to the second support portion.