Damaged screw removing screwdriver

Details Damaged screw removing screwdriver Damaged screw removing screwdriver

1999-10-28

2001-01-23

Scherbel, David A. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S177200

Reexamination Certificate

active

06176161

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a screwdriver, and more particularly, to an improved screwdriver for removing a screw that has a damaged head. The damaged screw removing screwdriver has a plurality of blade portions extending radially outward from a periphery of the tip of the screwdriver so that the blade portions cut into the rounded slots in the head of a bolt to rotate the bolt.
BACKGROUND OF THE INVENTION
A conventional screwdriver as shown in
FIG. 9
generally includes a shank
100
and a handle (not shown) from which the shank
100
extends. The tip of the shank
100
has a special designed shape such as grooves
101
so as to engage with slots
200
in the head
300
of a bolt so that when the tip is engaged with the slots
200
in the head
300
of a bolt, the bolt can be rotated to be tightened or loosened by rotating the screwdriver. The function is well known in the art. However, the material of the head
300
of the bolt could be softer than the material of the screwdriver so that when rotating the screwdriver, the slots
200
in the head
300
of the bolt could be rounded or damaged. Once the slots
200
in the head
300
of the bolt is rounded, the screwdriver cannot be engaged with the slots
200
properly and the bolt will not be rotated when rotating the screwdriver. Two special designed damaged screw removing screwdrivers known to applicant are respectively illustrated in U.S. Design Pat. No. 371,946, which is issued on Jul. 23, 1996 and U.S. Design Pat. No. 405,672 which is issued on Feb. 16, 1999. Both of the two patented damaged screw removing screwdrivers have a tip portion so as to engage with the bottom of the damaged head of a bolt so as to tighten or loosen the bolt having the damaged head. Nevertheless, a drill is required to drill a notch in the damaged head of a bolt so that the tip portion of the damaged screw removing screwdriver can easily engage with the head of the bolt. In other words, the user has to prepare a drilling tool to drill a notch in the damaged head of the bolt.
The present invention intends to provide a damaged screw removing screwdriver to rotate a bolt wherein the slots in the head of the bolt are rounded or damaged. The screwdriver has a plurality of blade portions which extend radially outward from the tip of the screwdriver so that the blade portions cut into the bottom of the rounded slots in the head of he bolt by pressing the screwdriver toward the head of the bolt.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a damaged screw removing screwdriver comprising a handle and a shank extending from the handle. The shank has a distal end and a plurality of blade portions extend radially outward from the distal end of the shank. Each of the blade portions has a cutting edge and a corner. The cutting edge and the corner of each blade portion cut into the material of the rounded slots of the head of a bolt by impacting the handle toward the bolt so that the bolt can be tightened or loosened by rotating the screwdriver.
The primary object of the present invention is to provide a damaged screw removing screwdriver which has blade portions extending from the periphery of the shank and the blade portions are to be cut into the rounded slots of the head of a bolt so that the bolt having a rounded slots in the head is still tightened or loosened conveniently.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.


REFERENCES:
patent: 839105 (1906-12-01), Butler
patent: 1743505 (1930-01-01), Turgeon
patent: 2815054 (1957-12-01), Cummaro
patent: 2923335 (1960-02-01), Joyce
patent: 4187892 (1980-02-01), Simmons
patent: 4325153 (1982-04-01), Finnegan
patent: 4434687 (1984-03-01), Vickio
patent: 4858504 (1989-08-01), Tsai
patent: 5012709 (1991-05-01), Su
patent: 5943925 (1999-08-01), Huang
patent: 6033082 (2000-03-01), Lin

Affiliated with

Also associated with

Rating

Damaged screw removing screwdriver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Damaged screw removing screwdriver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Damaged screw removing screwdriver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2494153