Abstract: An underwater motive device includes a rear main housing including two side handle bars, a forward joining member having a decreased diameter, a shoulder between the forward joining member and a remaining portion of the rear main housing, a battery compartment defined in both the forward joining member and the remaining portion of the rear main housing wherein the forward joining member includes an annular front end, an annular front surface between the annular front end and the shoulder, two opposite first rails on a joining portion of the annular front end and the annular front surface, and a first space on the annular front surface and abutting each first rail; and a front cone including a rear opening, an internal, annular surface on a rear portion, and two opposite sets of a second rail and a second space.

Abstract: An underwater motive device includes a rear main housing including two opposite handle bar elements on two sides respectively, and longitudinal rear joining projections on an inner surface; a power mechanism in the rear main housing; a propeller driven by a driving shaft of the power mechanism; a bridging housing including a battery compartment, a forward joining member, a shoulder abutted the forward joining member, and a rear joining member; a hollow intermediate housing including two opposite handle bar members on two sides respectively, the handle bar members joined the handle bar elements, longitudinal front joining projections on an inner surface, and an internal annular limit element at a front end; and a front cone including a rear opening and a structure on an inner surface for securing to the forward joining member of the bridging housing.

Abstract: A folding device of a scooter includes a connector adapted to be secured on a front portion of a platform of the scooter. A housing is sleeved on the connector. A pivot seat is pivotally connected to the connector and selectively positioned to the connector. A cover is secured on the connector and the housing for closing the housing to prevent the user's finger being moved into the connector and clamped by the moving pivot seat during folding the scooter.

Abstract: A folding device of a scooter includes a connector adapted to be secured on a front portion of a platform of the scooter. A housing is sleeved on the connector. A pivot seat is pivotally connected to the connector and selectively positioned to the connector. A cover is secured on the connector and the housing for closing the housing to prevent the user's finger being moved into the connector and clamped by the moving pivot seat during folding the scooter.