| 摘要 |
An apparatus for driving roofing nails into a roof deck or the like. A carriage is movable with respect to the surface of a roof deck, and carries one or more weights for movement therewith. Means are provided for raising a weight to a raised position a predetermined distance above the roof deck and for aligning a roofing nail below said weight with the head of said nail facing said weight. Control means are provided for releasing said weight means to enable said weight means to accelerate under the influence of gravity for imparting a force to said nail in a direction tending to drive said nail into said roof deck.
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