Anish Paul,Matthew A. Cutler,Tyler Joseph Ethen,Christopher S. Hough
申请号：
US14984403
公开号：
US09668928B2
申请日:
2015.12.30
申请国别(地区):
US
年份:
2017
代理人:
摘要：
A chair includes a backrest that pivots with respect to the seat in a manner that improves the occupants experience during the transition from an upright position to a reclined position. During pivoting of the backrest with respect to the seat, the backrest moves in a manner having an instantaneous center of rotation that does not remain stationary during the pivoting of the backrest. In some embodiments, the instantaneous center of rotation begins at a location lower than a height of the seat and moves backward as the backrest pivots from the upright position to the reclined position. The movement of the instantaneous center of rotation follows a smoothly curved path that has a continuous first derivative and, in some embodiments, continuous higher order derivatives as well. The movement may be effectuated via pins coupled to the backrest that ride in smoothly curved channels defined in a seat frame.
