Tamper resistant threaded fastener

Details Tamper resistant threaded fastener Tamper resistant threaded fastener

1980-07-23

1982-10-05

Britts, Ramon S.

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

Internally threaded fastener element, e.g., nut, etc.

411402, 411910, 81121R, F16B 3700, F16B 2300

Patent

active

043526144

ABSTRACT:
A device for effecting a generally tamper resistant threaded connection. The device includes a threaded fastener and a tool for driving and setting the fastener. The fastener has an internally threaded body portion, and a hollow cylindrical axially extending tool engaging portion spaced radially outward from the body portion and interconnected therewith. The tool engaging portion has a generally serrated driving surface defined by a plurality of circumferentially spaced recesses for receiving a like number of complementary shaped projections on the tool. The recesses and the projections cooperate to establish a driving connection between the fastener and the tool when the tool is turned in a direction for driving and setting the fastener. When the tool is turned in a direction for backing-off the fastener once it has been set, the recesses and the projections cooperate to slidingly eject the projections from the recesses to break the driving connection between the tool and the fastener.

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