US 12,310,902 B2
Chair with an elastic lifting seat pan
Xinde Qu, Shanghai (CN); Jun Wang, Shanghai (CN); and Jian Ke, Shanghai (CN)
Assigned to Shanghai Respecting Intelligence Technology Co., Ltd., Shanghai (CN)
Filed by Shanghai Respecting Intelligence Technology Co., Ltd., Shanghai (CN)
Filed on May 23, 2023, as Appl. No. 18/200,598.
Claims priority of application No. 202210621665.9 (CN), filed on Jun. 1, 2022; and application No. 202310424139.8 (CN), filed on Apr. 20, 2023.
Prior Publication US 2023/0390131 A1, Dec. 7, 2023
Int. Cl. A61G 5/14 (2006.01); A47C 7/56 (2006.01)
CPC A61G 5/14 (2013.01) [A47C 7/566 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A chair with an elastic lifting seat pan, comprising:
a chair body including a baseplate, a left armrest and a right armrest firmly connected with the baseplate, a backrest firmly connected with the baseplate and the left armrest and the right armrest, and legs and feet supporting the baseplate;
a transmitting component, including
a pair of hinge holders respectively extending up from the baseplate at two corners of the baseplate near the chair back on left side and right side, firmly connecting with the baseplate respectively, and each of which has an upper hinge seat and a lower hinge seat,
a pair of driving links, each of which is joined with the lower hinge seat at one end by a hinge respectively and the hinge is a key-in hinge, and
a pair of guiding links, each of which is joined with the upper hinge seat at one end by a hinge respectively, and a pair of link plates, each of which there is an upper hinge seat and a lower hinge seat, each of the two upper hinge seats is joined with the other end of each guiding link by a hinge respectively, and each of the link plates includes a plane connecting seat on its upside;
a driving component, including
a chassis plate to be firmly connected on the pair of hinge holders of the transmitting component with a pair of holders vertically extending from a surface of the chassis plate in which an circular curved slider is provided,
a cross beam provided to plug into the circular curved slider of the holder at its two ends so as to slide along the circular curved slider,
at least one torsion spring arranged between the pair of holders, having a central end with a central hole and a peripheral end firmly connected with the cross beam by a hook joint, and
a spindle inserting into the central hole of the torsion spring to form a key connection with the torsion spring formed therebetween, and to form a coaxial mechanical connection at its two ends with the hinge axles of the lower hinge seats in the transmitting component; and
a seat pan having a shape to fit the chair body and attached with the plane connecting seat of the pair of link plates in the transmitting component,
wherein when the user is seated on the seat pan, the torsion spring is deformed with the rotation of the spindle, accumulating elastic potential energy and damping the descent of the seat pan; when the user stands up from the seat pan, the torsion spring releases the elastic potential energy to drive the spindle reversely and help the user to stand up.