Importance

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Abstract

In a motion chair which is also a platform rocker with an extensible, retractable ottoman, handled-operated rotation of the torque tube which extends transversely between the side linkages for coordinating thrusting and retraction of the left and right ends of the ottoman is relied upon for setting and releasing a rocker lock secured on the underside of the rocker cam subframe intermediate and, preferably medially of the side linkages. The rocker lock includes two struts respectively transverse axis-pivoted scissors-fashion to a fixed mounting link. Rollers may be provided on the free first ends of these struts and their opposite second ends are connected by means of further interpivoted links to the torque tube in such a manner that as the torque tube is rotated in one angular sense, the strut second ends are pulled up to lower the rollers into engagement with fixed cross members of the chair platform subframe. And as the torque tube is rotated in the opposite angular sense, the strut second ends are pushed down, thus raising the rollers and thus inactivating the rocker lock. The preferred arrangement of links is such that when the ottoman is thrust without reclining the chair back, the forward rock-preventing landing gear lands first, with further torque tube rotation serving to force the chair to rock a few degrees backwards on the platform before the rearward rock-preventing landing gear lands. The same rocker lock with minor modifications to torque tube attachment links can be used on chairs having different particular designs of side linkages.

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First Claim