Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2001-01-09
2001-10-23
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S058000
Reexamination Certificate
active
06305247
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet wrench structure, and more particularly to a ratchet wrench structure having a simple construction with fewer parts.
2. Description of the Related Prior Art
A conventional ratchet wrench
10
in accordance with the prior art shown in
FIG. 1
comprises a pawl member
11
, a ratchet portion
12
, a rotation cover
13
, a locking ring
14
, and screws
15
. However, the conventional ratchet wrench
10
has a complicated construction with multiple assembly parts. In addition, it is necessary to additionally provide screws
15
for fixing the locking ring
14
during the assembling and dismantling process of the conventional ratchet wrench, thereby consuming the assembling and dismantling time, and thereby increasing cost of fabrication of the conventional ratchet wrench.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a ratchet wrench structure comprising:
a wrench body including a head portion defining a receiving space, a receiving chamber defined in the head portion and located beside the receiving space, an annular groove defined in the head portion and located at an upper edge of the receiving space;
an annular toothed block secured in the receiving space of the wrench body and having an outer periphery provided with a plurality of teeth;
a locking block pivotally mounted in the receiving chamber of the wrench body and having one side provided with a plurality of engaging teeth mating with the teeth of the annular toothed block;
a spring mounted in the receiving chamber of the wrench body and having a first end urged on an inner wall of the receiving chamber of the wrench body and a second end urged on a rear end of the locking block;
a cover mounted in the receiving chamber of the wrench body for covering the locking block and the spring and defining an arcuate groove mating with the annular groove of the wrench body, an inclined face provided on the cover and located under the arcuate groove; and
a C-shaped snap secured in and retained by the annular groove of the wrench body and the arcuate groove of the cover, and rested on the annular toothed block.
By such an arrangement, the ratchet wrench structure of the present invention can be directly assembled and dismantled by manual work easily and rapidly such that the assembling and dismantling work of the ratchet wrench structure does not need to additionally provide a screw or the like for locking it, thereby facilitating the assembling and dismantling process of the ratchet wrench structure, and thereby greatly saving time for assembling and dismantling the ratchet wrench structure.
In addition, the cost of fabrication of the ratchet wrench structure is greatly decreased.
Further, the ratchet wrench structure of the present invention has a simple construction with fewer parts.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 4796492 (1989-01-01), Liou
patent: 6044731 (2000-04-01), Hsieh
patent: 6148695 (2000-11-01), Hu
patent: 6151993 (2000-11-01), Shiao
Baxley Charles E.
Shakeri Hadi
Smith James G.
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