Abstract: A power supply management method applied to a charging station system including a plurality of battery swapping cabinets and an AC discharging cabinet. Each battery swapping cabinet receives an AC mains, and includes a plurality of batteries. The method includes steps of: (a) determining that the AC mains fails to supply power normally so that the batteries cannot be powered by the AC mains and operated in a power-off idle mode, (b) selecting one of the batteries to discharge for providing the power required by the charging station system, (c) determining the selected battery is in a discharging and loaning mode to select one battery swapping cabinet to operate in a discharging mode, and (d) supplying power to the AC discharging cabinet by converting the power of the battery through the selected battery swapping cabinet.

Abstract: A battery swapping cabinet includes an AC-to-DC converter, a plurality of charging/discharging DC converters, a plurality of batteries, a first auxiliary DC converter, and a main board. The AC-to-DC converter converts an AC power supply into a DC bus voltage. The charging/discharging DC converters respectively receive the DC bus voltage and convert the DC bus voltage into a plurality of DC voltages. The plurality of batteries receives the plurality of DC voltages. The first auxiliary DC converter receives the DC bus voltage and converts the DC bus voltage into a first state voltage. The main board receives the first state voltage and a second state voltage. According to a state of the AC power supply, the main board provides the first state voltage or the second state voltage to the plurality of batteries to maintain the power required for the uninterrupted operation of the plurality of batteries.

Abstract: A connection assembly of the present invention is provided for connecting a drum shell to a support. The connection assembly includes at least two fixation pieces, a connection member, two positioning bolt and a clamp. The fixation pieces are fixed on the drum shell. The fixation pieces are fastened on the connection member along a horizontal direction and a horizontal direction by the positioning bolts and several tension rods. The clamp is disposed on the connection member. The clamp is used for being detachably connected to the support. As such, the drum assembled from the drum shell is stably supported by the connection assembly. Performance can be precisely provided.

Abstract: The body of drum includes an outer body, an inner body, and two positioning loops. The outer and the inner bodies are both hollow rings but are made of different materials. Each positioning loop has a first face and an opposite second face. A convex rib protrudes on the center of the width of the first face and partitions the first face of the positioning loop to a ring-shaped inner fringe and a ring-shaped outer fringe. The fringes of the two opposite ends of the outer body are disposed on the two outer fringes respectively, and the fringes of the two opposite ends of the inner body are disposed on the two inner fringes respectively. The convex rib is located between the outer and the inner bodies. Thus, the timbre can be changed by making different combinations of the inner and the outer bodies.

Abstract: A connection assembly of the present invention is provided for connecting a drum shell to a support. The connection assembly includes at least two fixation pieces, a connection member, two positioning bolt and a clamp. The fixation pieces are fixed on the drum shell. The fixation pieces are fastened on the connection member along a horizontal direction and a horizontal direction by the positioning bolts and several tension rods. The clamp is disposed on the connection member. The clamp is used for being detachably connected to the support. As such, the drum assembled from the drum shell is stably supported by the connection assembly. Performance can be precisely provided.

Abstract: A pedal support for percussion instruments comprises a frame including a perpendicularly door-shaped supporting portion and a horizontal mounting portion, the supporting portion being fixed on the mounting member and including two ends, each having a positioning hole formed thereon, the two positioning holes axially coupling with two L-shaped connecting members individually so that the connecting members allow to swing between a first position and a second position, and each of the connecting members including a retaining slot; and a U-shaped piece being pivotally connected to one end of the mounting portion, wherein as the connecting members are located at the first position, the connecting members and the frame are in a retracted status, as the connecting members are located at the second position, the retaining slots of the connecting members engage on the U-shaped piece.

Abstract: An adjustment stand includes a first block and a second block which are pivotably connected at two respective top ends thereof and an urging member is engaged with the second block by a bolt which extends through the two blocks and is connected with a nut. A transverse hole is defined transversely between the first and second blocks and a shaft extends through the transverse hole. A connection rod extends through the shaft and is connected to a percussion instrument. The first block has an insertion hole and a support rod is inserted into the insertion hole. A side hole is defined in the first block and communicates with the insertion hole. The urging member includes a semi-circular recess which is in contact with the support rod via the side hole. By loosening the bolt, the shaft and the first block can be pivoted about two perpendicular axes.

Abstract: A pedal stand for a musical instrument includes a main frame, a support rack foldably mounted on the main frame, and a locking device mounted between the main frame and the support rack to detachably lock the support rack on the main frame. Thus, when the push button of the locking device is pushed downward, the support rack is unlocked from the locking device and is pivotable relative to the main frame to fold the pedal stand, so that the pedal stand is folded easily and quickly. In addition, the user only needs to push the push button to fold the pedal stand, so that the pedal stand is folded in an energy-saving manner, thereby facilitating the user folding the pedal stand.

Abstract: A drum hoop for a tom-tom includes a wooden outer layer, and a metallic inner layer mounted in the outer layer. Thus, the inner layer of the drum hoop is made of metallic material, so that the drum hoop has a greater strength to withstand a striking action of the stick, thereby enhancing the lifetime of the drum hoop. In addition, the outer layer of the drum hoop is made of wooden material, so that the drum hoop has the natural sound effect, thereby enhancing the sound quality of the drum hoop.

Abstract: A pedal stand for a musical instrument includes a main frame, a support rack foldably mounted on the main frame, and a locking device mounted between the main frame and the support rack to detachably lock the support rack on the main frame. Thus, when the push button of the locking device is pushed downward, the support rack is unlocked from the locking device and is pivotable relative to the main frame to fold the pedal stand, so that the pedal stand is folded easily and quickly. In addition, the user only needs to push the push button to fold the pedal stand, so that the pedal stand is folded in an energy-saving manner, thereby facilitating the user folding the pedal stand.

Abstract: An elastic mounting device for a tom-tom drum holder includes a counterhoop body connected to the batter head of the drum and a holder for supporting the drum, characterized in that the holder is mounted aerially and two ends of the holder are provided with holes for the insertion of screw rods for tightening, the screw rods are externally mounted with an elastic collar and the screw rods with the elastic collar are then inserted into positioning holes provided on the counterhoop body, the inner edge of the counterhoop body is provided with a pad and a fastening nut for securing together with the holder, thereby by means of the mounting of the elastic collar with the screw rods, the drum vibrates slightly in accordance with the beating of the batter head of the