Tools – Wrench – screwdriver – or driver therefor – Handle or shank
Reexamination Certificate
1999-12-13
2001-02-06
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle or shank
C081S489000, C016SDIG001, C016S110100
Reexamination Certificate
active
06182538
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wrench, and more particularly, to a shank structure of a wrench. The shank has a plurality of recesses defined in two surfaces thereof and any two adjacent recesses are divided by a rib so as to have a light weight and a strong structural strength.
BACKGROUND OF THE INVENTION
A conventional wrench
10
is shown in FIG.
1
and generally includes a shank
12
with an box end
11
and an open end
13
. The shank
12
is made of solid metal so as to bear large torque when operating the wrench
10
. However, such the solid shank
12
is heavy and is not convenient for the user to carry and/or operate. Generally, the user will carry a whole set of wrenches having plural of specifications so as to tighten or loosen different buts or bolts. The whole set of wrenches is so heavy that the applicant expects to develop a new and useful wrench that has light weight and the structural strength is properly maintained.
The present invention intends to provide a wrench having a shank with a plurality of recesses defined in two surfaces thereof and ribs are formed to divide recesses so as to maintain the strength of the shank of the wrench.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a wrench comprising a shank having two ends. The shank includes a first surface and a second surface. A plurality of first recesses are defined in the first surface of the shank and divided by first ribs. A plurality of second recesses are defined in the second surface of the shank and divided by second ribs. The first ribs and the second ribs are located crosswise.
The object of the present invention is to provide a wrench wherein the shank has recesses defined in two surfaces thereof so that the whole weight of the wrench is reduced.
Another object of the present invention is to provide a light wrench wherein the recesses are divided by ribs wherein the ribs one the two surfaces of the shank are located crosswise.
REFERENCES:
patent: D. 25560 (1896-06-01), Smith
patent: 4091497 (1978-05-01), Bade
patent: 5008970 (1991-04-01), Tsai
patent: 5475894 (1995-12-01), Wildförster
patent: 6108870 (2000-08-01), Lo
Baxley Charles E.
Meislin D. S.
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