Chairs and seats – Movable back – Tiltable
Reexamination Certificate
2008-01-29
2008-01-29
McPartlin, Sarah B (Department: 3636)
Chairs and seats
Movable back
Tiltable
Reexamination Certificate
active
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.
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Casella Anthony J.
Delta Kogyo Co. Ltd.
Hespos Gerald E.
McPartlin Sarah B
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