Self-locking fastener with threaded swageable collar
First Claim
Patent Images
1. A fastener comprising:
- a bolt having a head and a shank extending axially from the head, the shank having a smooth section and a threaded gripping section having a at least one helical thread having a trunctuated vent angled surfaces formed between a spiral groove, the shank further having a locking groove adjacent the threaded gripping portion and a locking shoulder adjacent the locking groove opposite the threaded gripping section, each of the locking groove and the locking shoulder having a diameter smaller than a minor diameter of the threads in the threaded gripping section; and
a cylindrical collar having a threaded portion having a thread shaped to mate with the thread on the shank and having a swage portion, the swage portion having an end opposite the threaded portion, whereby the collar is fastened to the bolt by threading the threaded portion of the collar onto the threaded gripping section of the bolt and swaging the swage portion of the collar into the locking groove of the bolt, whereby the end of the collar extends beyond the locking shoulder of the shank and wherein approximately 90 to 95 percent of a load capability of the fastener is carried by the threaded gripping section of the shank and the threaded portion of the collar.
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Abstract
A fastener having a bolt and a threaded swageable collar. The bolt includes a head portion, a flange portion, and a shank portion which extends through two aligned apertures formed in adjacent panels. The shank portion includes a threaded gripping portion and a locking groove adjacent to the gripping portion. The collar is cylindrical having an internally threaded section and a swaging section whereby the collar is fastened to the bolt by threading the threaded section of the collar onto the threaded gripping section of the bolt and swaging the swage portion of the collar into the locking groove of the bolt.
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Citations
17 Claims
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1. A fastener comprising:
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a bolt having a head and a shank extending axially from the head, the shank having a smooth section and a threaded gripping section having a at least one helical thread having a trunctuated vent angled surfaces formed between a spiral groove, the shank further having a locking groove adjacent the threaded gripping portion and a locking shoulder adjacent the locking groove opposite the threaded gripping section, each of the locking groove and the locking shoulder having a diameter smaller than a minor diameter of the threads in the threaded gripping section; and
a cylindrical collar having a threaded portion having a thread shaped to mate with the thread on the shank and having a swage portion, the swage portion having an end opposite the threaded portion, whereby the collar is fastened to the bolt by threading the threaded portion of the collar onto the threaded gripping section of the bolt and swaging the swage portion of the collar into the locking groove of the bolt, whereby the end of the collar extends beyond the locking shoulder of the shank and wherein approximately 90 to 95 percent of a load capability of the fastener is carried by the threaded gripping section of the shank and the threaded portion of the collar. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of fastening panels with a fastener comprising the steps of:
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inserting a bolt having a head portion and a threaded shank portion having at least one helical thread having a truncated crest and angled surfaces formed between a spiral groove through aligned apertures in overlapping panels until the head portion engages a first surface of the overlapping panels;
threading a cylindrical collar having a threaded portion having a thread shaped to mate with the thread on the shank and a swage portion onto the threaded shank portion until the threaded portion of the collar engages a second surface of the panels opposite the first surface;
swaging the swage portion of the collar into a locking groove of the bolt adjacent the threaded shank portion by forming an annular groove in the swage portion; and
carrying 90 to 95 percent of load on the fastener by the threaded shank portion of the bolt and the threaded portion of the collar. - View Dependent Claims (9)
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10. A fastener assembly comprising:
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a bolt having a head and a shank extending axially from the head;
the shank having at least one helical thread having a truncated crest and a threaded gripping section having angled surfaces formed between a spiral groove and a locking groove adjacent the threaded gripping section; and
a cylindrical collar having a threaded portion on the inside diameter of the collar having a thread shaped to mate with the thread on the shank and a swaging portion adjacent the threaded portion, the swaging portion having at least one driving notch for rotating the collar onto the shank and extending beyond an end of the shank when the collar is in the installed position on the shank, wherein 90 to 95 percent of a load capability of the fastener assemble is carried by the threaded gripping section of the shank and the threaded portion of the cylindrical collar. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification