Open end wrench

Details Open end wrench Open end wrench

2001-03-08

2002-05-21

Smith, James G. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S186000

Reexamination Certificate

active

06389933

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to open end wrenches and more particularly to an open end wrench with improved holding characteristics.
2. Description of the Prior Art
Head of a conventional open end wrench is shown in
FIGS. 1
to
4
comprising three projections
20
,
21
, and
22
at one arm
10
and an arcuate section
41
at the other opposite arm
40
. Each of projections
20
,
21
, and
22
has a first interior surface
23
at one side and a second interior surface
24
at the other side. A hexagonal nut (or bolt head) engages with a point on arcuate section
41
, first interior surface
23
, and second interior surface
24
. As shown in
FIG. 3
, only a point on arcuate section
41
is engaged with the arcuate portion
301
of angle
30
of nut. Further as shown in
FIG. 4
, only side
32
is engaged with the first interior surface
23
while side
31
is at a point contact with the first interior surface
24
. In view of above, the engagement is not secure. Thus a slip may occur between wrench and nut when user holds and turns the nut by the wrench. Thus, improvement exists.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an open end wrench having a head comprising a first arm comprising a first, second, and third projections each having a first interior surface at one side and a second interior surface at the other side; and an opposite second arm comprising a first, second, and third flats. A first distance between the first flat and the first interior surface of the first projection is smaller than a second distance between the second flat and the first interior surface of the second projection, a third distance between the third flat and the first interior surface of the third projection is larger than the second distance between the second flat and the first interior surface of the second projection, and an angle &thgr; is formed between one side of a held fastener and the second interior surface of one of the first, second, and third projections. By utilizing this, a fastener (e.g., nut) is secured when held by the wrench. Also, such small angle &thgr; ensures torque to be completely transferred to nut while turning wrench. Hence, a slip between wrench and nut in operation as experienced in prior art is eliminated.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 6276240 (2001-08-01), Blacklock

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