| 摘要 |
A lock spindle blind rivet assembly is provided which is intended to be received in a hole in a workpiece, and which is made up of a sleeve adapted to be received in the hole, a stem having a forward section with an outer diameter slightly less than the inner diameter of the sleeve and a rear section with an outer diameter slightly greater than the inner diameter of the sleeve, the forward and rear sections of the stem being separated by an annular locking groove which forms an annular shoulder around the stem. A collar having an outer diameter greater than the inner diameter of the sleeve, and having an inner diameter slightly greater than the outer diameter of the forward section of the stem but less than the diameter of the annular shoulder, is slidably mounted on the forward section of the stem to be moved back along the forward section to engage and be stopped by the annular shoulder. Thereafter the collar upsets or expands outwardly the rear end of the sleeve against the workpiece as the stem is drawn into the sleeve. The collar thereby causes the rear end of the sleeve to be clamped against the workpiece. Thereafter, the collar is moved or swaged down in to the locking groove in the stem as the rear section of the stem enters the sleeve. The collar is moved through the sleeve to the forward end thereof as the rear section of the stem is drawn into the sleeve, the rear section providing an outward radial clamping action on the sleeve, and the collar forming a lock for the stem at the front of the sleeve when the operation is completed. The forward section of the stem may then be broken off from the rear section at a break line adjacent the front edge of the locking groove.
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