Bracket angle adjustment mechanism

Chairs and seats – Movable back – Tiltable

Reexamination Certificate

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Reexamination Certificate

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07322654

ABSTRACT:
Disclosed is a bracket angle adjustment mechanism which includes external-tooth and internal-tooth gears having improved tooth shapes allowing an operating force for rotating a control shaft to be reduced. In the bracket angle adjustment mechanism, each of external teeth (14b) of the external-tooth gear14has a half-round shape having a center defined by a single point “a” on a reference circle PC (14), in a region of an addendum T1between the reference circle PC (14) and a tip circle AC (14), and an undercut shape in a region of a dedendum T2between the reference circle PC (14) and a root circle DC. Further, each of internal teeth (15b) of the internal-tooth gear (15) has an arc shape free of interference with the half-round-shaped addendum region.

REFERENCES:
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patent: 4302047 (1981-11-01), Esser
patent: 5096261 (1992-03-01), Baloche
patent: 5188571 (1993-02-01), Boltze et al.
patent: 5716159 (1998-02-01), Tomikawa
patent: 5871414 (1999-02-01), Voss et al.
patent: 7086699 (2006-08-01), Addison et al.
patent: 7090298 (2006-08-01), Lange
patent: 2005/0110322 (2005-05-01), Cha
patent: 2005/0231017 (2005-10-01), Lange
patent: 63-47443 (1994-12-01), None
patent: 7-79740 (1995-08-01), None
patent: WO 03/043847 (2003-05-01), None

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