A vehicle seat reclining device is disclosed. An operation mechanism allows a second memory member to engage with and disengage from a first memory member, and locks and unlocks a lock member in conjunction with the engagement and disengagement. When the first memory member is in a predetermined rotational position relative to the second rotating member, the second memory member is inserted into an engagement slot provided in the first memory member, thereby restricting rotation of the first memory member relative to the second rotating member. The operation mechanism includes a link member that is linked to the second memory member inserted into a guide hole provided in a plate-shaped member. In the thickness direction of the plate-shaped member, the link member is arranged on the same side of the plate-shaped member as the first memory member.

A seat reclining device includes a first memory member that frictionally engages with the outer surface of a first rotating member, and a second memory member that is capable of engaging with and disengaging from the first memory member. The first memory member has a frictional engagement portion that has an annular shape with a discontinuous section and is fitted to a circumferential wall portion of the first rotating member.

Powered recliner chairs, assemblies for use in the chairs, and components for use in the assemblies are provided. Control systems and methods for operating powered recliner chairs are also provided. Any given chair may be locally and/or remotely controlled.

Powered recliner chairs, assemblies for use in the chairs, and components for use in the assemblies are provided. Control systems and methods for operating powered recliner chairs are also provided. Any given chair may be locally and/or remotely controlled.

The present invention provides an office chair (2) comprising a base (8), a seat (4), a chair column (6) that extends in the vertical direction between the base (8) and the seat (4), and a backrest (12), further comprising an electric drive unit that comprises an electric motor and a change gear, the change gear being designed to input the rotational force of the electric motor into a first adjustment device for adjusting a seat height of the seat (4) and converting said force in a second adjustment device for adjusting a tilt of the seat (4) or the backrest (12).