| 摘要 |
A GEARBOX HOUSING OF AN ELECTRIC FAN COMPRISES A CASE (20) WHICH IS INJECTION-MOLDED INTEGRALLY BY A PLASTIC MATERIAL.THE CASE (20) HAS A MOUNTING PLATE (21) FORMED ON THE REAR SIDE THEREOF, A GEAR-RECEIVING SPACE (23) FORMED THEREIN,FIRST AND SECOND TUBULAR MEMBERS (231,232)EXTENDING FROM THE BOTTOM OF THE CASE (20).THE FIRST AND SECOND TUBULAR MEMBERS (231,232) HAS A BORE (2311) AND A THROUGH HOLE(2321)RESPECTIVELY COMMUNICATED WITH THE GEAR- RECEIVING SPACE(23).THE SECOND TUBULAR MEMBER (232) FURTHER HAS A PLURALITY OF REINFORCING RIBS (24) INTERCONNECTING THE EXTERNAL WALL FACE THEREOF AND THE BOTTOM OF THE CASE (20).ONE OF THE REINFORCING RIBS (24) INTERCONNECTS THE EXTERNAL WALL FACES THE FIRST AND SECOND TUBULAR MEMBERS (231,232) AND THE BOTTOM OF THE CASE (20).(THE MOST ILLUSTRATIVE DRAWING IS
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