Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Reexamination Certificate
2002-02-08
2004-03-09
Wilson, Lee D. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
Reexamination Certificate
active
06701808
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a hand tool, and more particularly to a wrench having a box end. When the box end of the wrench is fitted onto a hexagonal screwed member, the box end is able to stop the screwed member from slipping from the wrench. Furthermore, the box end is able to hold the screwed member.
A conventional wrench has a box end formed with a polygonal socket for fitting onto and driving a screwed member such as a nut or a bolt. The socket passes through the box end so that when the box end of the wrench is fitted onto the screwed member, the screwed member is likely to slip out of the socket. This results in inconvenience in operation. Many kinds of improved wrenches with stopping effect have been developed to prevent the screwed member from slipping from the wrench.
FIG. 1
shows a conventional wrench
10
having a polygonal socket
11
. A projecting section
12
is formed on the top edge of each inner corner. When the wrench is fitted onto a nut
14
, the projecting sections
12
serve to stop the nut as shown in FIG.
2
.
FIGS. 3 and 4
show another type of conventional wrench
15
having a head section
16
. A ring body
17
is inlaid in the head section
16
and protrudes from the inner circumference into the socket
18
for stopping a nut.
Both the above stopper structures have shortcomings. For example, when the wrench is fitted onto the screwed member, the screwed member is prevented from upward slipping out of the socket. However, when lifting the wrench, the screwed member still will downward slip out of the socket. In other words, the wrench is unable to hold the screwed member in the socket.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a wrench capable of preventing a screwed member from slipping out of the socket of the wrench. Furthermore, the wrench is able to hold the screwed member.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2320044 (1943-05-01), Merriman
patent: 2801561 (1957-08-01), Bonner
patent: 2805594 (1957-09-01), Fogel
patent: 2806706 (1957-09-01), Fitch
patent: 2880637 (1959-04-01), Koenig
patent: 3347293 (1967-10-01), Clark
patent: 5295422 (1994-03-01), Chow
patent: 5791848 (1998-08-01), Lanham
patent: 6332382 (2001-12-01), Anderson et al.
Kamrath Alan
Thomas David B.
Wilson Lee D.
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