| 摘要 |
The present invention relates generally to improvements in apparatus and methods for driving and setting a work piercing fastener rivet, and more particularly to simplified and very practical apparatus and methods for driving and setting rivets of the type comprising a shank expanding pin member associated with a headed rivet shank having an expandable entering extremity. The embodiment of the invention disclosed herein includes an elongate shiftable driving tool for causing a rivet to pierce a workpiece. A longitudinal chamber within the tool communicates at one extremity with a pin accommodating aperture. Abutment means spaced axially from said aperture is adapted to engage a pin driving member freely shiftable longitudinally within the chamber. Kinetic energy resulting from sudden interruption of the driving movement of the tool upon complete insertion of the rivet member within the workpiece serves to cause the rivet expanding pin to move forwardly and expand the entering extremity of the rivet member. |
