Shearable fastener

Details Shearable fastener Shearable fastener

2007-05-08

2007-05-08

Duverne, J. F. (Department: 2839)

Electrical connectors

Metallic connector or contact having movable or resilient...

Duplicate receiving means having independently operated...

Reexamination Certificate

active

10503002

ABSTRACT:
A shearable fastener has a threaded shank adapted for engagement with a threaded bore and a head portion formed for engagement with a drive tool, the shank being formed with a series of axially separated weakenings defining a series of shear planes. The weakenings are formed such that the applied torque necessary to cause the shank to shear increases progressively from the shear plane furthest from the head portion to the shear plane nearest the head portion. The weakenings are holes, grooves or slits formed in the shank and the radius at the bottom of the holes, grooves or slits is varied to produce or contribute to the increase in shear torque.

REFERENCES:
patent: 3876279 (1975-04-01), Underwood
patent: 3901066 (1975-08-01), Orlomoski
patent: 4199216 (1980-04-01), Gryctko
patent: 5964768 (1999-10-01), Huchner
patent: 6042430 (2000-03-01), Hollick
patent: 6699062 (2004-03-01), Barnett et al.
patent: 199 60 198 (2001-06-01), None
patent: WO 96/31706 (1996-10-01), None
PCT International Search Report, International Application No. PCT/GB03/0311; filed Jan. 27, 2003; mailed May 26, 2003.
GB Search Report; Application No. GB 0202710.0; Date of Search: Jun. 11, 2002.

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