Abstract: A wheel assembly for use on a toy car includes a roller defining an axis of rotation, a wheel portion connected to the roller. The periphery of the wheel portion an at least partially sticky surface, which includes a blank portion without a tendency to stick.

Abstract: A wall-climbing toy for negotiating an upstanding surface includes a housing with a movable part connected to the housing, wherein the housing has an opening; a wall-climbing wheel assembly located within the housing and partly exposed through the opening to engage an upstanding wall for countering gravitational force; and a transmission system that harvests power in the movement of the housing to bring about movement of the movable part, wherein the transmission system includes a clutch mechanism which engages to move the movable part by or with movement of the housing, and disengages to release the movable part.

Abstract: A wheel assembly for use on a toy car includes a roller defining an axis of rotation, a wheel portion connected to the roller. The periphery of the wheel portion an at least partially sticky surface, which includes a blank portion without a tendency to stick.

Abstract: A wall-climbing toy for negotiating an upstanding surface includes a housing with a movable part connected to the housing, wherein the housing has an opening; a wall-climbing wheel assembly located within the housing and partly exposed through the opening to engage an upstanding wall for countering gravitational force; and a transmission system that harvests power in the movement of the housing to bring about movement of the movable part, wherein the transmission system includes a clutch mechanism which engages to move the movable part by or with movement of the housing, and disengages to release the movable part.

Abstract: A body has a liquid-activatable powder mixture disposed in a metal casing with a first end that extends towards a second end longitudinally and includes at least one perforation, a conductive rod with a first end located adjacent and beyond the first end of the metal casing and extends towards the second end in contact with the powder mixture, a permeable separator, disposed between the liquid-activatable powder mixture and the metal casing, for electrically isolating the negative electrode from the positive electrode while being permeable to liquid useful in activating the powder mixture, and a passage, extending from the perforation of the metal casing through the permeable separator, for allowing a flow of liquid to activate the liquid activatable powder mixture. The metal casing is moveable relative to at least the body between a first position to expose and a second position to conceal the perforation on the metal casing.

Abstract: A battery body has opposite ends; a liquid-activatable powder mixture disposed therein; a positive electrode rod with a first end located adjacent a first end of the body and extends towards a second end of the body in contact with the powder mixture; a negative electrode, at which anions are oxidized, including a metal casing which has a first end located adjacent the first end of the body and extends towards the second end of the body; a permeable separator, disposed between the liquid-activatable powder mixture and the metal casing, for electrically isolating the negative electrode from the positive electrode while being permeable to liquid useful in activating the powder mixture; and a passage, extending between the first and second end of the body, for allowing a flow of liquid to activate the liquid activatable powder mixture.