| 摘要 |
An engineering safety cap for providing both security and ventilation. The cap according to a specific embodiment comprises a top portion, sides and an open bottom which together define an inner compartment. The top portion has a circular opening defined by axially extending walls and the opening is in communication with the inner compartment. The safety cap further includes a cylindrical cover having a motor driven fan mounted therein and which, in turn, is pivotably mounted at one edge thereof to the cap such that the cover can be positioned inside the cap opening. Magnets mounted on both the cover and the opening walls removably retain the cover in the closed position. Axially extending grooves are provided along the circumference of both the cover and the cap opening walls.
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