| 摘要 |
The improvement of the head of the blind rivet driving tool comprises (1) configuring and proportioning the head so that insertion of the shank of a blind rivet assembly into the tip of the head for installation causes the expendable portion of the rivet assembly previously installed to partially exit from the exit end of the head and (2) apparatus at the exit end which retains the expendable portion in the head until it is caused to partially exit and then holds the expendable portion unit it is extracted by the operator. The longitudinal axes of the head, its tip, casing and retention apparatus are essentially coincident. A preferred embodiment of the retention apparatus comprises a resilient wafer having a plurality of wedge shaped leaf spring segments extending from the rim of the wafer toward its center, the ends of the segments forming a segmented periphery of a hole having a diameter somewhat smaller than that of the rivet shank. As a shank portion is expelled the segments deflect to form a segmented periphery with a diameter large enough to allow the exit of the shank portion.
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