Back to results
US 6,042,430 AGranted
Fastener
AssigneeB & H (Nottingham) Limited
InventorDavid John Hollick
Life of this patent
Estimating the term…
Abstract
A shearable fastener has a threaded shank (10) adapted for engagement with a threaded bore and a head (12) formed for engagement with a drive tool. The shank (10) is formed with a series of axially separated weakenings (14) defining a series of shear planes, the weakenings (14) being formed such that the applied torque necessary to cause the shank (10) to shear increases progressively from the shear plane (14) furthest from the head (12) to the shear plane (14) nearest the head (12).
Claims19
A shearable fastener comprising:
- a threaded shank adapted for engagement with a threaded bore;
- a head portion formed for engagement with a drive tool;
- and means for defining a series of shear planes on the shank, said means for defining a series of shear planes including a series of axially separated weakenings;
- wherein 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 when said fastener is engaged with said threaded bore.
1 more element
Dependencies are inferred from the claim text.