Abstract: A mobile rack type battery box is constructed to include two hollow rectangular cover shells symmetrically fastened together by screws, each cover shell having at least one longitudinal inside groove for receiving electric wires and ventilation, and a plurality of battery cells mounted in the holding space defined within the cover shells and horizontally abutted against one another.

Abstract: An anti-leakage device in a fan mainly includes a blade assembly, a fan base and a motor section. The fan base is provided with a plurality of lock holes at the bottom of the spindle seat with an oil cap being pressed into a hollow space of the spindle seat of the fan base and a plurality of engaging juts are provided on the oil cap to engage with the lock holes of the spindle seat with an oil ring being placed between the spindle seat and the oil cap. The anti-leakage device has a tight engagement structure to perform prevention of the lubrication oil leakage and the bearing seat and the spindle in the blade hub constitute a joint with a slant angle and an oil resistant groove to avoid the lubrication oil leaking outward the fan via the spindle and the bearing seat.

Abstract: A bearing fixed assembly in a direct current fan includes a fan base, a motor unit, and a fan blade unit. The motor unit fits with the fan base and the fan blade unit is attached to the fan base and the motor unit with a spindle to constitute an integral structure. The fan base at the top thereof has an annular recess to form an inner ring and an outer ring and at the lower central area thereof has a closed chamber filled with lubrication oil. A stop ring is disposed in the annular recess to support the outer ring such that the motor unit can be sustained from deviation.

Abstract: A mobile rack type battery box is constructed to include two hollow rectangular cover shells symmetrically fastened together by screws, each cover shell having at least one longitudinal inside groove for receiving electric wires and ventilation, and a plurality of battery cells mounted in the holding space defined within the cover shells and horizontally abutted against one another.

Abstract: A bearing fixed assembly in a direct current fan comprises a fan blade unit, a fan base, and a motor unit. The fan base is disposed next to the fan blade unit and the motor unit is arranged between the fan blade unit and the fan base. The fan blade unit further comprises an integral fan blade, a spindle, a motor casing, and a magnet bar. The spindle is disposed at a lower periphery central position of the fan blade and extends to the fan base. The motor casing is disposed at a lower periphery inner side of the fan blade and the magnet bar is disposed at an inner side of the motor casing. The fan base further comprises a spindle seat, a retaining ring, a washer, and at least a bearing. The spindle seat has a lower closed containing space filled with lubrication oil. The retaining ring is attached to the spindle next to the spindle seat. The washer is arranged on top of the retaining ring.

Abstract: A method for making a game racket includes two molds having a mold cavity for receiving an annular rib and a network engaged between the molds and engaged with the annular rib. A material is injected into the mold cavity of the molds for forming the annular frame of the game racket and for forming the annular rib in the annular frame and for allowing the network to be secured to the annular frame without threading operation. The annular rib has one or more holes for engaging with the material and for allowing the annular rib to be solidly secured in the annular frame.

Abstract: A game racket includes an annular frame and a tube secured to the annular frame. An annular rib is engaged in the annular frame, and a network has a peripheral portion engaged with the annular rib and engaged in the annular frame for allowing the network to be secured to the annular frame without threading operation. The game racket may thus be made quickly and the manufacturing cost may thus be greatly decreased. The annular rib has one or more holes for engaging with the plastic material and for allowing the annular rib to be solidly secured in the annular frame.