Abstract: A scoreboard assembly has a scoreboard, a storage box and a detachable stand. The scoreboard includes a folding board. The storage box is detachably connected to the scoreboard. The stand is detachably connected to the scoreboard and is detachable into a top board, a telescopic column, a joint and at least three legs. The telescopic column is detachably connected to the top board. The joint is detachably connected to the telescopic column. The legs are detachably connected to the joint. When the scoreboard assembly is in use, the stand is assembled and the scoreboard is elevated by the stand, which allows players and spectators to watch the score displayed on the scoreboard easily. When the scoreboard assembly is not in use, the stand is disassembled for storage in the storage box and the folding board of the scoreboard is folded to cover the storage box for portability.

Abstract: A coach board has a mounting board, a transparent film, an attractive board and a box. The transparent film is connected to the mounting board so as to form an interlayer space between the transparent film and the mounting board. The attractive board is removably inserted into the interlayer space between the transparent film and the mounting board and has a court layer. The court layer is attached to the attractive board, is visible via the transparent film and is protected by the transparent film. The box is mounted on the mounting board and receives multiple magnets inside. Therefore, a coach can instruct tactics to players easily by putting the magnets on the transparent film corresponding to the court layer of the attractive board.

Abstract: A coach board has a mounting board, a transparent film, an attractive board and a box. The transparent film is connected to the mounting board so as to form an interlayer space between the transparent film and the mounting board. The attractive board is removably inserted into the interlayer space between the transparent film and the mounting board and has a court layer. The court layer is attached to the attractive board, is visible via the transparent film and is protected by the transparent film. The box is mounted on the mounting board and receives multiple magnets inside. Therefore, a coach can instruct tactics to players easily by putting the magnets on the transparent film corresponding to the court layer of the attractive board.

Abstract: A strike trainer has an attachment assembly, a shock absorber, a target mount and a target. The attachment assembly has an attachment body, an outer stabilizer being mounted on the attachment body, a metal sleeve being mounted through the attachment body and the outer stabilizer and an inner stabilizer being formed inside the metal sleeve. The shock absorber is connected to the metal sleeve of the attachment assembly. The target mount is mounted in the shock absorber and has an inner disk, an outer disk, a metal sleeve and a plastic tube being mounted inside the metal sleeve. The outer disk is mounted on an outer surface of the inner disk, the metal sleeve of the target mount is mounted through the inner and outer disks and the plastic tube is mounted in the metal sleeve. The target is mounted on the target mount.

Abstract: An air pump includes a cylindrical casing, a manometer movably received in the cylindrical casing to be selectively extended out of the cylindrical casing, an air duct securely received in the manometer to be firmly engaged with an inner face defining the reduced bottom opening of the cylindrical casing, a tube to be received inside the manometer, a rod having an annular groove to receive therein a second O ring, a recoil spring mounted outside the manometer. Therefore, when the first O ring is moved upward relative to a downward movement of the manometer to abut a top periphery of the groove, air inside a space defined by the manometer and cylindrical casing is able to flow through a gap between the manometer and the tube and into the air duct via a channel in the rod and into an object to be inflated.