Multi-tiered-recess screws

Details Multi-tiered-recess screws Multi-tiered-recess screws

2006-01-24

2006-01-24

Meislin, Debra S (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S441000, C411S403000, C411S407000, C411S410000

Reexamination Certificate

active

06988432

ABSTRACT:
A screw and driver system includes a range of screws and a driver. Each screw has a head having a driving recess in its surface for engagement by the driver. The recess of larger screws in the range have a plurality of superimposed recess tiers of decreasing size with increasing depth from said surface. Each tier has substantially parallel driving surfaces and torque applied to the driver is transmitted to the screw through the driving surfaces. At least one tier of at least smaller screws in the range has a rib. Engagement of the driver with the recess causes deformation of rib, and hence creation of an interference fit of the driver in the recess.

REFERENCES:
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patent: 4258596 (1981-03-01), Bisbing et al.
patent: 4955936 (1990-09-01), Douglas
patent: 5870934 (1999-02-01), Cullinan
patent: 6792838 (2004-09-01), Brooks et al.
patent: 6813978 (2004-11-01), Karpp
patent: 2003/0053887 (2003-03-01), Brooks
patent: 1150382 (1969-04-01), None
patent: 2285940 (1995-08-01), None
patent: 2329947 (1999-04-01), None
patent: WO 0177538 (2001-10-01), None
patent: WO 03025403 (2003-03-01), None

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