| 摘要 |
An elongated shaft assembly is provided including first and second end portions and the first end portion includes a non-circular end for rupturing and mixing, upon rotation of the first end portion, a resin capsule seated in a bore into which the first end portion is inserted. The second end portion of the shaft assembly includes a diametrically reduced externally threaded terminal end and a conical shoulder merges the threaded terminal end with the larger diameter section of the second end portion. Radially expandable and circumferentially rupturable sleeve structure is slidingly disposed on the diametrically reduced end portion for advancement toward and engagement with the conical shoulder for expanding and circumferentially rupturing the sleeve structure and an apertured roof plate is slidable on the diametrically reduced terminal end, thrust structure being threaded on the diametrically reduced terminal end and engageable with the sleeve structure for applying axial thrust thereto. The thrust structure includes a portion thereof abuttingly engageable with the side of the plate remote from the first end portion of the shaft assembly.
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