| 摘要 |
A fastener for securing two pieces of roofing material includes an elongated member having a pointed tip end and a flange like head end. The elongated member includes an internal channel that extends substantially the entire length of the member and terminates in an opening in the head and a double faced ramp at the tip. A plunger and flexible barb are disposed for longitudinal movement within the channel and the elongated member contains a pair of sidewall openings located proximate the ramp and communicating with the channel. The openings are provided with barb directing surfaces that engage the barb and cause it to move in a direction substantially perpendicular to the longitudinal axis of the channel as the barb exits the opening. The opening is also provided with a barb engaging surface that produces a frictional drag on the barb causing it to curl as it exits the opening.
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