Abstract: A swing stool arm for use in a swing stool has a horizontal top flange, a horizontal bottom flange, a vertical end flange at a proximal end of the arm, a web extending down from the top flange and up from the bottom flange, and a vertical fillet at the proximal end of the arm. The vertical fillet joins the vertical end flange to the web. The vertical fillet has an open cavity so that the swing stool arm can be made from a cast molten aluminum alloy without forming shrinkage cavities.

Abstract: A swing stool arm for use in a swing stool has a horizontal top flange, a horizontal bottom flange, a vertical end flange at a proximal end of the arm, a web extending down from the top flange and up from the bottom flange, and a vertical fillet at the proximal end of the arm. The vertical fillet joins the vertical end flange to the web. The vertical fillet has an open cavity so that the swing stool arm can be made from a cast molten aluminum alloy without forming shrinkage cavities.

Abstract: A differential control apparatus for a self-balancing scooter includes platform interfaces, such as clamping mechanisms, configured to be rigidly connected to respective foot platforms of the self-balancing scooter, and a differential drive coupler mechanically joined to the platform interfaces to impart differential rotational motion thereto in response to a mechanical control input. A rider interface control mechanism is connected to the differential drive coupler to supply the mechanical control input in response to user control actions to control movement of the self-balancing scooter in operation.

Abstract: A swing stool table kit has components to form a swing stool table. The swing stool table has a table top and pairs of swing stools on opposite sides of the table top. The swing stools swing out for a person to sit on and swing in for storage. The swing stools are made from light weight cast aluminum so that the overall weight of the kit is low. The table has footplates that extend out beyond the edge of the table but not beyond the swing stools when they are swung out so that the table will not tip over when heavier than average people all sit on one side of the table and no one sits on the other side of the table.

Abstract: A swing stool table kit has components to form a swing stool table. The swing stool table has a table top and pairs of swing stools on opposite sides of the table top. The swing stools swing out for a person to sit on and swing in for storage. The swing stools are made from light weight cast aluminum so that the overall weight of the kit is low. The table has footplates that extend out beyond the edge of the table but not beyond the swing stools when they are swung out so that the table will not tip over when heavier than average people all sit on one side of the table and no one sits on the other side of the table.

Abstract: A differential control apparatus for a self-balancing scooter includes platform interfaces, such as clamping mechanisms, configured to be rigidly connected to respective foot platforms of the self-balancing scooter, and a differential drive coupler mechanically joined to the platform interfaces to impart differential rotational motion thereto in response to a mechanical control input. A rider interface control mechanism is connected to the differential drive coupler to supply the mechanical control input in response to user control actions to control movement of the self-balancing scooter in operation.