Tamper-resistant fastener key

Details Tamper-resistant fastener key Tamper-resistant fastener key

1984-01-18

1984-10-23

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81461, B25B 1500

Patent

active

044781156

ABSTRACT:
A key for a tamper-resistant fastener having three sockets, one below the other, one of the sockets being eccentric relative to the center axis of the fastener. The key comprises a flat blade portion having integral upper, middle and lower insertable portions, the center axis of the middle insertable portion being off-set from the center axis of the key. The width and length of each of the insertable portions corresponds respectively to the diameter and depth of the upper, middle, and lower sockets. The upper and lower insertable portions of the key prevent tilting of the key when torque is applied by the off-centered middle section to the eccentric middle socket of the fastener.

REFERENCES:
patent: 4025140 (1977-05-01), Matys
patent: 4258596 (1981-03-01), Bisbing et al.

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