Abstract: A ventilated roofing structure includes a modular roofing panel unit adapted to form part of an outermost layer of a roof, a wall unit which is secured to the roofing panel unit, and which extends downwardly to terminate at an anchored end to partition a space under the roof into outside and inside spaces, and which has a ventilation opening communicating the inside and outside spaces, and a modular drainage-route forming panel unit which is fastened to an overhanging eave of the roofing panel unit to form a gap therebetween. The drainage-route forming panel unit extends downwards to separate the outside space into an airflow transit chamber and an outdoor space, and has an anchoring edge secured to the anchored end, and a drainage port communicating the airflow transit chamber with the outdoor space.

Abstract: A ventilated roofing structure includes a modular roofing panel unit adapted to form part of an outermost layer of a roof, a wall unit which is secured to the roofing panel unit, and which extends downwardly to terminate at an anchored end to partition a space under the roof into outside and inside spaces, and which has a ventilation opening communicating the inside and outside spaces, and a modular drainage-route forming panel unit which is fastened to an overhanging eave of the roofing panel unit to form a gap therebetween. The drainage-route forming panel unit extends downwards to separate the outside space into an airflow transit chamber and an outdoor space, and has an anchoring edge secured to the anchored end, and a drainage port communicating the airflow transit chamber with the outdoor space.

Abstract: A ratchet screwdriver includes a first tubular member with an open end and a closed end. A bore extends from the open end towards the closed end. The inner side of the closed end has a recessed groove and the outer side of the same is connected to a handle. The wall of the first tubular member has a thorugh-hole therein into which two annular projections extend. A second tubular member has an open end and a closed end. A second bore for carrying a bit, extends from the open end towards the closed end of the same. A ratchet wheel with a shaft is co-axially mounted on the closed end of the second member, when fit in the bore of the first member the shaft is journalled in the recessed groove of the closed end of the first member. A locking mechanism baised by spring member, is mounted on the first member, and disposed in the through-hole of the first member, the lower end of which having an oblique side extending into a notch formed between two adjacent teeth of the ratchet wheel.