| 摘要 |
In apparatus for setting blind rivets including a mandrel-clamping chuck, a drive screw and split nut sections, there is provided a holding collar arranged around the nut sections and axially movable relative thereto. In a holding position the collar holds the nut sections firmly in an operative engagement with the drive screw without radial deformation under load. The nut sections are initially set by pressing the nut sections toward one another against the drive screw and springs move the collar axially to the nut-holding position once they have been moved together. The collar is inhibited from rearward axial movement and when the nut sections have moved a sufficient distance to set the rivet head and break the mandrel the collar is axially displaced relative to the nut sections to a released position so that it no longer holds the nut sections together and allows springs to spread the nut sections apart and return the nut sections to a forward starting position. |
