Apparatus for displacing extensible/contractible board for chair in case of emergency
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 1992
Grant Date -
N/A
app pub date -
Apr 18, 1990
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An unique apparatus for displacing an extensible/contractible board for a chair in case of an occurrence of emergency is disclosed. The apparatus includes a board support, an engagement piece, a turn guide plate, a stationary guide plate and an opposing pair of base members. The board assumes a horizontal attitude during normal use. In case of emergency, an excessive magnitude of outer force in excess of resilient force derived from Belleville springs is imparted to the board by an user's hand so that the engagement piece is disengaged from the turn guide plate via operative engagement of an eccentric projection on the board shaft with an engagement recess on the engagement piece. This causes the board to be displaced from the horizontal attitude to a vertical attitude, whereby a sufficiently wide space is provided in front of the user so as to enable him to quickly escape from his chair. When the board is not in use, the board is received in a hollow space defined by an opposing pair of sleeve plates below one elbow rest of the chair.
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