Chair and support mechanism unit thereof
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United States of America Patent
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Nov 13, 2007
Grant Date -
Aug 17, 2006
app pub date -
Feb 2, 2006
filing date -
Feb 2, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A chair is provided with a base 6 fixed at an upper end of a leg pillar 5, a back support unit 13 attached to the base 6 so as to tilt backward, a backrest 3 attached to the back support unit 13, and a spring unit 14 supporting the backward tilt of the back support unit 13. The spring unit 14 is to expand and contract in a back and forth direction when viewed from above and arranged further behind than a tilt supporting point 16a of the back support unit 13. The back support unit 13, the spring unit 14, and the base 6 constitute a kind of link mechanism and the spring unit 14 will expand and contract mainly at the front end, while tilting backward.
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