| 摘要 |
An adjustable roof scaffold jack means for mounting on a pitched roof that includes adjustment means coupled to a support member adapted to be leveled to the horizontal for receiving a platform for workman to use in working on a vertical or angular surface adjacent to said pitched roof. The means include a base for mounting on the roof and a hinged support member with the adjustment means extending therebetween. The jack means when used with additional jack means forming a base for receiving platforms and conventional scaffold means which are tied together to present a safe area for receiving platforms for workmen to stand on.
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