| 摘要 |
A fastener includes a sleeve, a core bolt, and an insert. The sleeve includes a first portion having a first inner diameter, a second portion having a second inner diameter, and a step intermediate the first and second portions. The core bolt includes a cylindrical portion having a first diameter, a threaded portion having a major diameter, and a thread run-out intermediate the cylindrical and threaded portions. The insert is disposed within the sleeve and is sized and shaped to be retained between the step of the sleeve and the thread run-out of the core bolt when the fastener is in a pre-installation position. The fastener compresses the insert between the step of the sleeve and the thread run-out of the core bolt by an installation motion of the core bolt. The insert deforms away from the core bolt to initiate formation of a bulb in response to the compression. |
| 主权项 |
1. A fastener adapted to be installed in aligned holes of a plurality of work pieces, the plurality of work pieces including a blind side, the aligned holes having an inner diameter, the fastener comprising:
a sleeve having a tubular portion, a first end, a second end opposite said first end, an enlarged head at said first end, and a pocket formed within said enlarged head, said tubular portion having an outer surface having an outer diameter, said outer diameter of said tubular portion being sized and shaped to enable the sleeve to be installed within the aligned holes, said tubular portion including a first portion proximate said first end and having a first inner diameter, a second portion adjacent said first portion and having a second inner diameter that is less than said first inner diameter, a third portion proximate said second end and having internal threads, and a step intermediate said first and second portions; a core bolt disposed within said sleeve and having a first end, a second end opposite said first end, and a shank portion between said first end and said second end, said shank portion including a cylindrical portion proximate said first end and having a first diameter, a threaded portion proximate said second end and including threads having a major diameter that is less than said first diameter, and a thread run-out intermediate said first and second portions, said first diameter of said cylindrical portion of said core bolt being sized and shaped to enable said core bolt to be installed within said sleeve, said threads of said threaded portion being complementary to said internal threads of said sleeve, said core bolt being adapted to be engaged by an installation tool; and an insert disposed within said sleeve and encircling a portion of said core bolt, said insert being sized and shaped to abut and be retained between said step of said sleeve and said thread run-out of said core bolt when said fastener is in a pre-installation position, wherein said fastener is adapted to compress said insert between said step of said sleeve and said thread run-out of said core bolt by an installation motion of said core bolt with respect to said sleeve before said installation motion of said core bolt generates a compressive load on said sleeve, and wherein said insert is adapted to deform away from said core bolt to initiate formation of a bulb adjacent the blind side of the plurality of work pieces in response to said compression. |
