| 摘要 |
The present invention relates to a personal fall-arrest safety anchor of a unitary form, including a hoop portion for encircling a standard dimensioned rafter and an apertured tab portion for attachment of a lifeline. The hoop portion includes two parallel vertical members and a bridging web unitarily connecting the lower ends of the vertical members. The bridging web prevents pullout of the anchor in the direction of forces exerted by a lifeline. The bridging web further allows a bracing or wedging member to be inserted between the bottom of the rafter and the bridging web, which act both as a locking wedge and additional load bearing support for the rafter. An independent overlapping plate installed over the vertical members of the anchor reduces the chances of fastener pull-out by a torque or shearing force upon fasteners. A preformed elastomeric flashing with a frusto-pyramidal apertured member is installed over the tab portion for weather-proofing the anchor.
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