Patent ID: 7971936
Filing Date: 2011-07-05
Classification: A47C,Y10T

Abstract:
1. A link mechanism for a chair, comprising: a first link having one end connected to a bottom surface of a link that supports a seat surface portion of the chair; a second link having one end connected to another end of the first link; a first joint portion rotatably connecting the first link and the second link; a second joint portion provided at another end of the second link; a first elastic resistance unit imparting elasticity in a rotating direction to the second joint portion; a third link having one end connected to a link that supports a back surface portion of the chair; a fourth link having one end connected to another end of the third link, and having another end connected to the second joint portion; a third joint portion rotatably connecting the third link and the fourth link; a fifth link connecting the first joint portion and the third joint portion; and a second elastic resistance unit imparting repulsion elasticity to the third link.