Reversible adjustable wrench

Details Reversible adjustable wrench Reversible adjustable wrench

2002-02-21

2003-10-28

Meislin, D. S. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Jaw faces

C081S179000, C081S170000

Reexamination Certificate

active

06637300

ABSTRACT:

FIELD OF THE INVENTION
The present invention related to a wrench, and more particularly to a reversible adjustable wrench.
BACKGROUND OF THE INVENTION
In prior art, when use 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 returning to the initial angle and reengages 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. It will have nuts of specific dimensions, which 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
and 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 reversible turning the nut.
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, an adjustable wrench comprises a handle having a fixed jaw and a guiding slot at an end of the handle. The fixed jaw has at least one stopping portion thereon. A movable jaw has an end thereof slidable received in the guiding slot of the handle. An adjusting worm is to drive the movable jaw moving toward and away from the fixed jaw. A rotatable device is pivoted at the fixed jaw to be turned relative to the fixed jaw. The rotatable device has a holding portion facing the movable jaw, and an elastic member is disposed between the fixed jaw and the rotatable device to drive the holding portion of the rotatable device turning to the tip end of the fixed jaw for the rotatable being against the topping portion of the fixed jaw, such that the holding portion of the rotatable device only can be turned to the proximal end of the fixed jaw.


REFERENCES:
patent: 925522 (1909-06-01), Stalker
patent: 2630037 (1953-03-01), McComb
patent: 2700315 (1955-01-01), Hermanson
patent: 2721493 (1955-10-01), Bergland
patent: 4070933 (1978-01-01), Macintosh
patent: 4449430 (1984-05-01), Nakamura et al.
patent: 4706528 (1987-11-01), Inoue

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