Tools – Wrench – screwdriver – or driver therefor – Sliding jaw face
Reexamination Certificate
2002-03-28
2004-05-25
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Sliding jaw face
C081S165000, C081S170000
Reexamination Certificate
active
06739223
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wrench, and more particularly to a roller type reversible adjustable wrench.
BACKGROUND OF THE INVENTION
In prior art, when using an adjustable wrench to turn a nut (or a bolt), it has to disengage the nut after turning an angle. And then, turns the adjustable wrench reversibly and engages the adjustable wrench to the nut again for driving the nut to turn. User has to repeat the procedures described above to turn tight or to turn loose the nut.
FIG. 1
shows a conventional reversible adjustable wrench
90
, which is capable of turning a nut without having to disengage and reengage the nut. The adjustable wrench
90
disposes two round channels
911
and
921
at the fixed jaw
91
and the movable jaw
92
respectively. Two racket rods
93
and
94
, which have teeth faces
931
and
941
on outer ends thereof, are slidable received in the round channels
911
and
921
respectively. Two elastic members
95
and
96
are disposed at the fixed jaw
91
and the movable jaw
92
respectively for pushing the racket rods
93
and
94
respectively.
In use, user drives the movable jaw
92
moving toward the fixed jaw
91
to make the teeth faces
931
and
941
of the fixed jaw
91
and the movable jaw
92
holding a nut N. After that, user can turn the adjustable wrench
90
clockwise to drive the nut N to turn. On the contrary, when user turns the adjustable wrench
90
counterclockwise, the nut N will drive the racket rods
93
and
94
sliding into the round channels
911
and
921
, such that the adjustable wrench
90
can turn backward but without driving the nut N to turn. Thus, the adjustable wrench
90
can turn a nut or a bolt without having to disengage and reengage the nut or the bolt repeatedly.
Hereunder are the disadvantages of the conventional reversible adjustable wrench
90
as described above:
1. The adjustable wrench
90
defines the teeth faces
931
and
941
of the racket rods
93
and
94
to hold the edges of the nut N. It will easy to damage the nut N when turning.
2. The adjustable wrench
90
is to turn the nuts in a range of different dimensions. There will be nuts of specific dimensions cannot be held by the teeth faces
931
and
941
stably.
3. If user drives the movable jaw
92
too close to the fixed jaw
91
, the racket rods
93
and
94
will be pushed into the round channels
911
and
921
to cause the fixed jaw
91
and the movable jaw
92
will be against the nut N directly. Thus, the adjustable wrench
90
will loose the capability of repeated turning the nut.
4. The reversible adjustable wrench
90
is to hold the nut N by the teeth faces
931
and
941
of the racket rods
93
and
94
respectively, the nut N is suspended and not parallel to the fixed jaw
91
and the movable jaw
92
. But the normal adjustable wrench is to hold the nut by fixed jaw and the movable jaw directly, where the nut is supported by the handle and is parallel to the fixed jaw and the movable jaw. The reversible adjustable wrench
90
had an operating mode different from conventional adjustable wrench that will make user can not get used to it rapidly.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a reversible adjustable wrench, which has the capability of reversible turning a nut or a bolt but without the drawbacks as described above.
According to the objective of the present invention, a reversible adjustable wrench comprises a handle, which has a fixed jaw and a guiding groove at an end thereof. The fixed jaw has a chamber, which has an opening at a side of the fixed jaw. The chamber has a guiding face therein, which has a stop portion at an end thereof closing to the tip end of the fixed jaw. A movable jaw has an end thereof slidable received in the guiding groove of the handle. An adjusting worm is pivoted at the handle for driving the movable jaw moving toward and away from the fixed jaw. A roller is received in the chamber of the fixed jaw, which has a part thereof exposed out of the chamber via the opening and is against the guiding face at opposite side, and at least one elastic member is disposed between the fixed jaw and the roller for providing the roller a force substantially orientating to the tip end of the fixed jaw, whereby the roller will be stopped by the stop portion and only be driven to move along the guiding face.
REFERENCES:
patent: 720784 (1903-02-01), Cochran
patent: 2646711 (1953-07-01), Yavner
patent: 2721493 (1955-10-01), Bergland
patent: 2730000 (1956-01-01), Crittenden
patent: 2896488 (1959-07-01), Ahana
patent: 3906822 (1975-09-01), Hertelendy et al.
patent: 4158975 (1979-06-01), DeSousa
patent: 4574665 (1986-03-01), Blachly
patent: 5669272 (1997-09-01), Hansen
patent: 6079300 (2000-06-01), Hu
Browdy and Neimark , P.L.L.C.
Smith James G.
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