Self-aligning pivot bolt

Details Self-aligning pivot bolt Self-aligning pivot bolt

1987-07-15

1988-06-14

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Deformable securing means

411386, 411301, F16B 1900

Patent

active

047508515

ABSTRACT:
A self-aligning pivot bolt for mounting a belt tensioner idler pulley on a base member in which the bolt is formed with upper and lower cylindrical pilot sections separated by an intermediate threaded section. The base member has a bolt receiving opening formed with upper and lower inwardly tapered sections. The bolt and opening are dimensioned so that a lead thread of the threaded section engages an upper portion of the lower tapered section prior to the pilot sections engaging the respective tapered sections of the opening. After partial engagement of the threaded section the lower pilot section begins engagement with the lower tapered section to axially align the bolt within the hole followed by engagement of the upper pilot section with the upper tapered section. The softer metal of the base member flows into the root areas of the bolt threads to trap the bolt in the opening of the base member. The progressive engagement of the pilot sections with the tapered sections of the base member opening insures proper alignment of the bolt within the opening.

REFERENCES:
patent: 131945 (1872-10-01), Dunlap
patent: 2908309 (1959-10-01), Brill
patent: 4600343 (1986-07-01), Frerejacques

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