Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
2001-08-20
2002-07-30
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S438000
Reexamination Certificate
active
06425307
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a screwdriver, and more particularly to a screwdriver having a plurality of interchangeable tips of various specifications.
2. Description of Related Art
As shown in
FIG. 1
, a prior art screwdriver comprises a handle
12
, a shank
13
, and a tip
10
which is detachably fastened at one end with a chuck end of the shank
13
. The tip
10
is of a specification and can be interchanged with another tip
11
, as shown in FIG.
2
. The tip
11
is different in specification from the tip
10
. It is conceivably inconvenient to use the prior art screwdriver described above in view of the fact that the tip
10
must be kept in the tool box at the time when the tip
11
is in use, and vice versa. In addition, the user of the prior art screwdriver moves around the work site. It is therefore very inconvenient for the user of the prior art screwdriver to carry the tool box with him or her while moving from one place to another on the work site.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is therefore to provide a screwdriver comprising a handle, a shank, a chuck rod, a first blade, and a second blade. The chuck rod is provided with two chuck slots different in specification from each other. The first blade and the second blade are provided with the phillips tips of various specifications and the cabinet or keystone tips of various specifications. The first blade and the second blade are held interchangeably by the chuck slots of the chuck rod. The two ends of the chuck rod are interchangeably engageable with the shank.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 2667194 (1954-01-01), Fischer et al.
patent: 3114401 (1963-12-01), Johnson
patent: 5481949 (1996-01-01), Yen
patent: 5533429 (1996-07-01), Kozak
patent: 5904080 (1999-05-01), Anderson et al.
Danganan Joni B.
Hail III Joseph J.
Harrison & Egbert
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