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.

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.

A track tension device and a track moving device are provided. The track tension device includes an upper transmission belt, a lower transmission belt, an upper tension portion, a lower compression portion and a resilient support portion. The track moving device includes the track tension device.

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.

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.

A track tension device and a track moving device are provided. The track tension device includes an upper transmission belt, a lower transmission belt, an upper tension portion, a lower compression portion and a resilient support portion. The track moving device includes the track tension device.

A wall climbing toy includes a frame body, a drive shaft, a plurality of spring-loaded release valves, a cam shaft, a drive unit, a left gear train, a shaft extension, a plurality of primary crank arms, a plurality of connecting rods, a plurality of suction cups, and a plurality of air tube units. When each of the spring-loaded release valves is displaced from a seal position to an open position, an air seal formed between a corresponding one of the suction cups and a flat surface is broken. When the drive shaft is driven concurrently with the cam shaft to rotate, the air seals formed between the suction cups and the flat surface are broken alternately so as to permit the connecting rods to be alternately pulled away from a flat surface.

A wall climbing toy includes a frame body, a drive shaft, a plurality of spring-loaded release valves, a cam shaft, a drive unit, a left gear train, a shaft extension, a plurality of primary crank arms, a plurality of connecting rods, a plurality of suction cups, and a plurality of air tube units. When each of the spring-loaded release valves is displaced from a seal position to an open position, an air seal formed between a corresponding one of the suction cups and a flat surface is broken. When the drive shaft is driven concurrently with the cam shaft to rotate, the air seals formed between the suction cups and the flat surface are broken alternately so as to permit the connecting rods to be alternately pulled away from a flat surface.

A wall climbing toy includes a frame body, a drive shaft, a plurality of spring-loaded release valves, a cam shaft, a drive unit, a left gear train, a shaft extension, a plurality of primary crank arms, a plurality of connecting rods, a plurality of suction cups, and a plurality of air tube units. When each of the spring-loaded release valves is displaced from a seal position to an open position, an air seal formed between a corresponding one of the suction cups and a flat surface is broken. When the drive shaft is driven concurrently with the cam shaft to rotate, the air seals formed between the suction cups and the flat surface are broken alternately so as to permit the connecting rods to be alternately pulled away from a flat surface.

A wall climbing toy includes a frame body, a drive shaft, a plurality of spring-loaded release valves, a cam shaft, a drive unit, a left gear train, a shaft extension, a plurality of primary crank arms, a plurality of connecting rods, a plurality of suction cups, and a plurality of air tube units. When each of the spring-loaded release valves is displaced from a seal position to an open position, an air seal formed between a corresponding one of the suction cups and a flat surface is broken. When the drive shaft is driven concurrently with the cam shaft to rotate, the air seals formed between the suction cups and the flat surface are broken alternately so as to permit the connecting rods to be alternately pulled away from a flat surface.