Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-12-27
2002-05-28
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C192S043100
Reexamination Certificate
active
06393949
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a hand tool, and more particularly to a ratchet screwdriver.
2. Description of Related Art
As shown in
FIGS. 1 and 2
, a ratchet screwdriver
10
of the prior art comprises a handle
11
having a main body
12
which is provided at the front end thereof with a shaft hole
14
with a core hole
13
. A shaft
17
is pivoted to the shaft hole
14
and is provided with a gear
15
and a protruded pillar
16
. A stop plate
19
is disposed in an insertion slot
18
of the main body
12
. The gear
15
is actuated by two check plates
20
which are provided with a dial button seat
22
having two elastic press plates
21
. A housing
24
is fitted over the main body
12
such that a retaining cut
25
of the housing
24
is engaged with a projection
26
of the main body
12
. The housing
24
has a position confining hole
23
. The main body
12
is further provided with a locking member
28
having a bearing hole
27
which is slidably fitted over the shaft
17
.
The prior art ratchet screwdriver
10
is defective in design because the main body
12
is not provided with sufficient torsional strength, because the check plates
20
are too thin, and because the adjustment of the dial button seat
22
cannot be easily done, and also because assembly of the ratchet screwdriver
10
is not cost-effective.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a ratchet screwdriver which is free of the deficiencies of the prior art ratchet screwdriver described above.
The features and the advantages of the present invention will be readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 5573093 (1996-11-01), Lee
patent: 5749272 (1998-05-01), Phan
patent: 5974915 (1999-11-01), Chou
patent: 6047801 (2000-04-01), Liao
patent: 6059083 (2000-05-01), Tseng
patent: 6151995 (2000-11-01), Shu
patent: 6240810 (2001-06-01), Ho
patent: 6305248 (2001-10-01), Rowlay
Hail III Joseph J.
Harrison & Egbert
Thomas David B.
Yen Hsing Enterprise Co., Ltd.
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