| 摘要 |
A pull head for installing pull type fasteners, such as rivetless nut plates . The pull head includes a sleeve, a nosepiece on the sleeve, and an insert which extends from the nosepiece. The insert enters an aperture in a workpiece and centers the pull head relative to the aperture. The insert is shiftable relative to the nosepiece, and preferably includes a taper at its end to facilitate entry into the aperture . The pull head includes jaws which grab and pull on a stem or fastener, and the insert provides that as the stem or fastener is pulled, a surface of the stem or fastener contacts t he insert and the insert is pulled along with the stem or fastener. As such, the insert begins in the aperture, but is pulled out of the aperture as the stem or fastener is pulle d to effect installation. |
