Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-10-27
2002-05-21
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063100
Reexamination Certificate
active
06389932
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a wrench, and more particularly to a ratchet wrench.
2. Description of Related Art
As shown in
FIGS. 1 and 2
, a ratchet wrench
10
of the prior art has a handle
11
and a main body
12
which is provided with a center axial hole
14
with a core pillar
13
for pivoting a shaft rod
17
. The shaft rod
17
is provided with a gear
15
and a core hole
16
. The main body
12
is further provided with an insertion slot
18
for retaining an insertion plate
19
, two check plates
20
, and a dial seat
22
having two elastic press plates
21
. The main body
12
is fitted into a housing
24
with a position confining hole
23
. The housing
24
is provided with a notch
25
for retaining a projection
26
of the main body
12
. The main body
12
is provided at the front end with a locking member
28
with a carrying hole
27
.
Such a prior art ratchet wrench as described above is defective in design in that the locking member
28
is apt to unfasten to unable to control the shaft rod
17
, and that the shaft rod
17
can not be easily aligned, and further that the shaft rod
17
is not structurally strong to sustain the torsion. In addition, the shaft rod
17
is complicated in construction and is therefore not cost-effective. Furthermore, the locking member
28
is apt to catch the machining chips which can inflict injuries on a person's hand at such time when the ratchet wrench
10
is in action.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a ratchet wrench is free of the deficiencies of the prior art ratchet wrench described above.
The objective, features and functions 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: 5142953 (1992-09-01), Lin
patent: 5379873 (1995-01-01), Shiao
patent: 5582081 (1996-12-01), Lin
patent: 5609078 (1997-03-01), Yang
patent: 5642794 (1997-07-01), Chuang et al.
patent: 5910196 (1999-06-01), Huang
patent: 6047801 (2000-04-01), Liao
patent: 6151995 (2000-11-01), Shu
patent: 6240810 (2001-06-01), Ho
Harrison & Egbert
Shakeri Hadi
Smith James G.
Yeh-Hsing Enterprise Co., Ltd.
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