Blind tack bolt with higher clamp-up strength
AssigneeThe Boeing Company
InventorsSCOTT WILLIAM GUNTHER, EDWARD JOHN BATT, FARAHNAZ SISCO
Life of this patent
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Abstract
A blind tack fastener includes a pull stem having an elongated shaft with an extended tail portion. The blind tack fastener also includes a crush-initiating washer, a crush sleeve, and a swage collar, surrounding the elongated shaft of the pull stem. The elongated shaft has a breakaway groove configured to create a predictive fracture point below the head-end surface of the swage collar, such that a hole in the swage collar serves as a centering lead-in for a drill that can be used to remove the blind tack fastener.
Claims20
A method of processing a workpiece comprising a plurality of parts with a hole extending through the workpiece, the method comprising:
- inserting a pull stem and a crush sleeve of a blind tack fastener through the hole in the workpiece such that a swage collar of the blind tack fastener is located on a first side of the workpiece and a crush-initiating washer of the blind tack fastener is located on a second side of the workpiece;
- pulling the pull stem of the blind tack fastener to form a bulb in the crush sleeve of the blind tack fastener, thereby compressing the parts of the workpiece between the swage collar and the bulb in the crush sleeve;
- breaking the pull stem below a head-end surface of the swage collar;
- performing one or more manufacturing operations on the workpiece;
- and
- removing the blind tack fastener by drilling the pull stem through a hole in the head-end surface of the swage collar.
A method of processing a workpiece, the method comprising:
- inserting a pull stem and a crush sleeve of a blind tack fastener through a hole in the workpiece such that a swage collar of the blind tack fastener is located on a first side of the workpiece and a crush-initiating washer of the blind tack fastener is located on a second side of the workpiece;
- pulling the pull stem of the blind tack fastener to form a bulb in the crush sleeve of the blind tack fastener, thereby compressing the workpiece between the swage collar and the bulb in the crush sleeve;
- and
- breaking the pull stem below a head-end surface of the swage collar.
Dependencies are inferred from the claim text.