One-direction captive screw fastener

Details One-direction captive screw fastener One-direction captive screw fastener

1995-11-06

1997-07-01

Meyers, Steven N.

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

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

Metallic resilient securing means

411352, 411970, 411999, F16B 2118

Patent

active

056429720

ABSTRACT:
A one-directional captive screw attachable to a panel that is hand tightenable, but requires a tool to loosen once hand tightened. The captive screw includes a screw having a head with a recess and a threaded portion, a knob having a central longitudinal axis coaxial with the screw, a one-directional ratchet between the knob and the screw. The ratchet engages to allow the screw to be tightened in a clockwise direction using the knob, and disengages when rotated in a counterclockwise direction, such that a tool is required to loosen the screw by use of the recess.

REFERENCES:
patent: 3126935 (1964-03-01), Tuozzo
patent: 3250559 (1966-05-01), Sommerfeld
patent: 4235269 (1980-11-01), Kraus
patent: 4692075 (1987-09-01), Metz
patent: 4696208 (1987-09-01), Lay
patent: 5069091 (1991-12-01), Bramsiepe et al.
patent: 5336628 (1994-08-01), Yamamoto
patent: 5382124 (1995-01-01), Frattarola

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