Abstract: A diving mask comprises a mask and a breathing tube. The mask is provided with a viewing compartment, a breathing compartment, a first airway and a second airway. The breathing tube is provided with a single breathing airway. The first airway connects the breathing airway and the viewing compartment. The second airway connects the breathing compartment and the breathing airway. The viewing compartment and the breathing compartment are connected through a first check valve. The breathing compartment and the second airway are connected through a second check valve. When the above-mentioned diving mask is in use, outside air can enter the breathing compartment through the breathing airway, the first airway, the viewing compartment and the first check valve. The exhaled air in the breathing compartment can be expelled out of the mask through the second check valve, the second airway, and the breathing airway.

Abstract: A device for batting and striking practice includes a support coupled to an upper end of a base. The support includes a cable embedded in a shell. A body is integrally formed on an upper end of the support. Two elements are clamped to the lower end and the upper end of the cable. Each of the elements has one or more outward extending ring portion so that the cable is stably retained and embedded in the shell and the body.

Abstract: A device for batting and striking practice having a base assembly to provide a firm support. The base assembly has a threaded hole for receiving a lower tube. A sleeve encompassing a set of packing rings and an intermediate tube constitute a height adjusting mechanism. The intermediate tube engages with a spring and a protective housing, which in turn engages with an upper tube. A variety of batting or striking bodies may be mounted on and engage with the spring.

Abstract: A batting aid having a sandbag with a vertically adjustable support on its upper surface. The top of the support has a seat member with a slot in which a disc is mounted for pivotal movement about a horizontal axis. Pivoting of the disc in one direction is limited by an adjustable braking member. An inverted L-shaped rod is fastened to the top of the disc. The short arm of the rod is threadedly connected to one end of a housing, and a ball is secured to the other end of the housing. A vertically adjustable rubber stop is mounted on the sandbag in position to be hit by the long arm of the L-shaped rod when the ball is struck by a racket, bat or golf club. The rubber stop causes the disc, rod, and ball to rebound toward their original position, and the braking member completes the resetting of the ball to its original position for the next striking swing.