Abstract: One aspect of the present invention relates to a vertical axis wind turbine. In one embodiment, the vertical axis wind turbine comprises a rotor comprising a vertical oriented shaft, and a plurality of vertical oriented blades angle-equally and radially secured to the vertical aligned shaft. Each of the plurality of vertical oriented blades has a face side, a back side, at least one window and at least one pane pivotally mounted onto the at least one window on the face side such that the at least one pane is rotatable between a closed position and an opening position around a pivotal axis responsive to a wind condition thereof. The pivotal axis is substantially perpendicular to the vertical oriented shaft.

Abstract: One aspect of the present invention relates to a vertical axis wind turbine. In one embodiment, the vertical axis wind turbine comprises a rotor comprising a vertical oriented shaft, and a plurality of vertical oriented blades angle-equally and radially secured to the vertical aligned shaft. Each of the plurality of vertical oriented blades has a face side, a back side, at least one window and at least one pane pivotally mounted onto the at least one window on the face side such that the at least one pane is rotatable between a closed position and an opening position around a pivotal axis responsive to a wind condition thereof. The pivotal axis is substantially perpendicular to the vertical oriented shaft.

Abstract: A portable support arm has a base, an arm, a locking spindle and a cover. The arm is attached pivotally to the base and has a bracket on which an object is mounted. The locking spindle connects the arm to the base and securely locks the arm in position relative to the base. The cover is mounted on the arm. When the portable support arm is used, the locking spindle is pulled out, and the arm is adjusted and rotated so the height of the object will be adjusted.

Abstract: An adjustable keyboard tray is composed of a sliding base (10), a connecting arm (20), a limit link (25), a drive assembly (30), a keyboard support (40) and a locking device (50). The connecting arm (20) is pivotally attached to the sliding base (10) and the keyboard support (40) at two ends respectively, wherein the limit link (25) and the drive assembly (30) are movably pivoted on one end of the connecting arm (20). The locking device (50) directly controls the drive assembly (30) to release/compress the limit link (25) and then to unlock/lock the connecting arm (20) by rotating an eccentric cam (53). When the connecting arm (20) is unlocked, the angle and height of the keyboard support (40) are simultaneously adjustable.

Abstract: A supporting device for a liquid crystal display includes a clip fixed to a frame, a base secured to the clip, an arm pivotally linked to the base, an adjustment device installed in the base, a cylinder device contained in the arm and pivotally linked to the adjustment device, and a positioning device formed on the top of the arm. The adjustment device has a simple structure and is able to adjust an angle of the cylinder device with respect to the arm to support displays of different weight.