Abstract: An adjustable armrest or humeral junture support for use with a chair having a seat and a reclining back. The armrest includes a first rail member attached to the side of the chair back, and a second rail member attached to the side of chair seat. Also, a first sliding member is coupled to the first rail member for sliding along the first rail member and with a locking structure for locking the first sliding member along the first rail member. A second sliding member is coupled to the second rail member for sliding along the second rail member and with a locking structure for locking the second sliding member along the second rail member. An armrest is located adjacent the side of the chair and has a front attachment portion and a back attachment portion and has the back attachment portion of the armrest pivotably attached to the first sliding member for rotational movement about the first sliding member.

Abstract: A lifting mechanism provides double action movement of a ram member supported on a platform along a particular axis between a first lower position and a second higher position. The lifting mechanism includes the following: A motor having a drive shaft extending along an axis. At least one axial drive member is coupled to the platform to provide axial movement of the platform along the particular axis. Gear means is coupled to the drive shaft and the axial drive member to translate the rotary motion of the drive shaft about the perpendicular axis to motion of the axial drive member along the particular axis to provide the axial movement of the platform. A movable ram member is supported on the platfrom and is moveable relative to the platform along the particular axis so that axial movement of the platfrom provides simultaneous movement of the ram member along the particular axis to produce the double action movement of the ram member upon rotation of the motor.