Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Reexamination Certificate
2000-09-25
2002-05-21
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
C081S121100, C081S186000
Reexamination Certificate
active
06389934
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wrench which has a box end with an elongated space in the box end and an object can be respectively engaged with the elongated space at two extreme positions so as to be rotated clockwise and counter clockwise without removing the wrench from the object.
A conventional wrench
10
is shown in FIG.
8
and includes an open end which includes two jaws
11
,
110
and a recess is defined in a throat portion between the two jaws
11
,
110
. The two jaws
11
,
110
are designed to engage a hexagonal object
12
. Another conventional wrench
100
is shown in FIG.
9
and has an open end and a box end which has a space
13
defined in the box end. A special designed inner periphery of the space
13
can engage a hexagonal object. As shown in
FIG. 10
, the two conventional wrenches
10
,
100
allow the box end and the open end to tighten the object
12
repeatedly because of the recess which allows a corner of the object
12
being received therein while the wrench
10
/
100
returns to its original position. Therefore, the wrench
10
/
100
can tighten the object
12
without removing the open end or the box end from the object
12
and aiming the object
12
again. However, this feature is applicable only in one direction, in other words, if the object
12
is to be loosened, the open end/box end of the wrench
10
/
100
has to be turn to the other side and engages the object
12
again.
The present invention intends to provide a wrench having a box end wherein the object is engaged at a first position in the space of the box end when rotating clockwise, and the object is engaged at a second position in the space when rotating counter clockwise.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a wrench and comprising a shank with a box end connected thereto. An elongated space is defined by a periphery in the box end and the elongated space comprises a first long side, a second long side and two short sides which are connected between the two first long side and the second long side. The periphery defining the elongated space comprises two identical portions which are symmetrical about an axis P which passes through a mediate point on the first long side and a mediate point on the second long side. Each portion of the elongated space comprises a substantial U-shaped cavity which includes one short side, a half first long side and a half second long side. Each short side has a first recess and a first engaging surface which connects an end of a periphery defining the first recess. The half first long side has a second engaging surface and a notch connected between the first engaging surface and the second engaging surface. An end of a periphery defining a second recess connects the second engaging surface. The half second long side has a third engaging surface which connects the other end of the periphery defining the first recess.
The primary object of the present invention is to provide a box end wrench that has an elongated space for a hexagonal object being engaged with two positions in the space. One position allows the object to be tightened and the other position allows the object to be loosened.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 1378160 (1921-05-01), Woodville
patent: 1954141 (1934-04-01), Miquelon
patent: 6131492 (2000-10-01), Mai
Baxley Charles E.
Meislin D. S.
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