Abstract: A cap includes a cap body having a cap cavity and a bottom brim, a cap accessory having a corresponding coupling edge, and a sliding rail assembly, wherein the sliding rail assembly includes an elongated guiding rail extended along the bottom brim of the cap body, and a sliding guider which is affixed to a portion of the coupling edge of the cap accessory and slidably engaged with the sliding rail in such a manner that the cap accessory is capable of selectively sliding along the bottom brim of the cap body.

Abstract: An airflow balancer for mounting on a ventilation outlet includes an air guider including a supporter having a bottom surface for rotatably supporting on the ventilation outlet and an airflow baffle coaxially mounted to the supporter such that the airflow baffle is suspendedly supported on the ventilation outlet. The airflow baffle has a plurality of ventilating slots for allowing an airflow passing therethrough and a rotor coaxially mounted on the air guider. The rotor is shaped and sized such that, in response to the airflow passing through the rotor, the rotor is driven to rotate, so as to drive the air guider to rotate, wherein a rotational movement of the air guider is adapted for evenly diffusing the airflow through the ventilating slots toward the ventilation outlet.

Abstract: An airflow balancer for mounting on a ventilation outlet includes an air guider including a supporter having a bottom surface for rotatably supporting on the ventilation outlet and an airflow baffle coaxially mounted to the supporter such that the airflow baffle is suspendedly supported on the ventilation outlet. The airflow baffle has a plurality of ventilating slots for allowing an airflow passing therethrough and a rotor coaxially mounted on the air guider. The rotor is shaped and sized such that, in response to the airflow passing through the rotor, the rotor is driven to rotate, so as to drive the air guider to rotate, wherein a rotational movement of the air guider is adapted for evenly diffusing the airflow through the ventilating slots toward the ventilation outlet.

Abstract: A pivot uplifting device incorporated with a dolly includes a pivot arm and a retaining unit rearwardly extended from a dolly frame to retain the pivot arm in a normal position and to guide the pivot arm to move at a pivot lifting position. In the normal position, the pivot is moved behind a ground platform of the dolly frame, and in the pivot lifting position, the pivot arm is moved underneath the ground platform, so that the pivot arm function as a pivot for the dolly frame pivotally lifting up an object on the ground platform.

Abstract: The present invention is a swimming tool cleaning tool that does not require the exertion of vertical force against the vertical surfaces of the swimming pool for effective cleaning. The person using the present invention only needs to push and pull on the cleaning tool to use it effectively to clean the swimming pool.