Fastener with magnetically actuated positive lock plug insert
First Claim
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1. A fastener assembly comprising:
- a fastener having a main body portion with an upper end terminating in an enlarged head, a threaded lower end, an outer wall and an irregularly configured inner cavity at the upper end;
a removable plug having an upper end and a lower end with an enlarged head at its upper end, said plug being removably mounted in said cavity, said removable plug and said cavity having locking means associated therewith for locking said plug in said cavity;
releasable locking means associated with said plug for releasing said locking means permitting removal of said plug out of said cavity, said plug enlarged head being flush with said fastener enlarged end when locked in said cavity, said cavity including an inner peripheral wall and said plug including a main body portion configured similarly to said cavity, said locking means including an annular groove extending about said wall, said locking means further including movable detent means mounted in said plug movable from a first position into said groove locking said plus in said cavity to a second position out of said groove permitting removal of said plug out of said cavity; and
said releasable locking means including a spring biased detent actuator reciprocally mounted in a chamber in the main body portion of said plug, said actuator being normally biased downwardly to a position forcing said detents into said groove.
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Abstract
A fastener having an enlarged head and a threaded portion with an interior cavity. A plug mounted in the cavity configured similarly thereto having an enlarged head generally the same outer diameter as the enlarged end of the fastener and abutting against the same closing off the opening leading into the cavity. The plug is releasably locked in the cavity and released by magnetic action when the releasable lock is released.
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Citations
19 Claims
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1. A fastener assembly comprising:
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a fastener having a main body portion with an upper end terminating in an enlarged head, a threaded lower end, an outer wall and an irregularly configured inner cavity at the upper end;
a removable plug having an upper end and a lower end with an enlarged head at its upper end, said plug being removably mounted in said cavity, said removable plug and said cavity having locking means associated therewith for locking said plug in said cavity;
releasable locking means associated with said plug for releasing said locking means permitting removal of said plug out of said cavity, said plug enlarged head being flush with said fastener enlarged end when locked in said cavity, said cavity including an inner peripheral wall and said plug including a main body portion configured similarly to said cavity, said locking means including an annular groove extending about said wall, said locking means further including movable detent means mounted in said plug movable from a first position into said groove locking said plus in said cavity to a second position out of said groove permitting removal of said plug out of said cavity; and
said releasable locking means including a spring biased detent actuator reciprocally mounted in a chamber in the main body portion of said plug, said actuator being normally biased downwardly to a position forcing said detents into said groove. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fastener comprising:
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a main body portion having an upper end and a lower end, said upper end having an enlarged head portion with a flat upper surface and an outer wall, said lower end having thread means for threadable engagement to a mating threaded member;
a cavity in said main body portion upper end having an inner hex-shaped wall and opening out of said enlarged head portion;
a plug having an irregularly configured outer configuration mounted in said cavity having an enlarged head portion with an upper surface and a lower surface said upper surface being generally flat and said lower surface abutting against the flat upper surface of the enlarged head portion of said fastener when said plug is mounted in said cavity;
said cavity having an irregularly configured configuration mating with the configuration of said plug; and
a plurality of spring biased spaced detents mounted in said plug, said detents disposed in a groove in the inner wall of said cavity locking said plug in said cavity. - View Dependent Claims (16, 17, 18, 19)
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Specification