Drill bit for applying torque to a fastener

Details Drill bit for applying torque to a fastener Drill bit for applying torque to a fastener

1999-03-17

2001-03-06

Scherbel, David A. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S467000

Reexamination Certificate

active

06196091

ABSTRACT:

FIELD OF THE INVENTION
In general, the present invention relates to drill bits and, in particular, the present invention relates to a drill bit for precisely applying torque to a fastener.
BACKGROUND
Stud mounted fasteners have existed for a number of years. One of their many uses is to mount the fasteners in a given area such that wires can be coupled thereto on extensions of the fasteners, typically via cable ties, and rerouted. The installation of these fasteners, however, has become difficult and commonly results in the extensions of the fastener being broken as a result of their use in applying torque to the fastener. What's more, torque is often over-applied to these fasteners causing them to be “stripped” and unuseable.
SUMMARY OF THE INVENTION
The present invention eliminates the above difficulties and disadvantages by providing a drill bit for applying torque to a fastener and mounting the fastener to a threaded stud. The fastener has a plurality of support walls and a bore disposed within the fastener. The drill bit has a shaft including a hexagonal end and an engagement end integrally formed with the hexagonal end for abutting the stud. A cross-shaped member is integrally formed with the shaft and positioned between the hexagonal end and the engagement end.
The cross-shaped member has a plurality of arms each including a front side and a ramp coupled to the front side for biasing against one of the support walls when the fastener is torqued such that the fastener is mounted onto the threaded stud. When mounting of the fastener on the stud is initiated, the fastener is rotated by the front side of each of the plurality of arms of the cross-shaped member biasing against one of the support walls of the fastener.
Subsequently, the engagement end of the shaft abuts the stud and is prevented from biasing axially. Simultaneously, the fastener continues to be progressively mounted on the stud as the fastener transitions from being rotated by the front side of each of the plurality of arms of the cross-shaped member biasing against one of the support walls of the fastener, to the ramp biasing against one of the support walls thereby limiting torque applied to the fastener via the drill bit and separating the fastener from the drill bit when the engagement member abuts the stud.


REFERENCES:
patent: 1371965 (1921-03-01), York
patent: 2800936 (1957-07-01), West
patent: 3760659 (1973-09-01), Campbell
patent: 3985170 (1976-10-01), Iskra
patent: 4109691 (1978-08-01), Wilson
patent: 5403130 (1995-04-01), Moser et al.
patent: 5528966 (1996-06-01), Coppejans
patent: 5660091 (1997-08-01), Stone et al.

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