Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Reexamination Certificate
2001-01-18
2002-02-12
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
C081S111000, C081S165000
Reexamination Certificate
active
06345555
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a reversible adjustable wrench, and more particularly to a reversible adjustable wrench in which a second jaw can be pivotally rotated to have a space for avoiding a bolt, permitting the wrench to be reversely wrenched.
FIG. 7
shows a conventional adjustable wrench. The wrench main body
8
has a fixed jaw
81
. A spiral rod
83
is pivotally disposed on the main body
8
for adjusting a movable jaw
82
. By means of rotating the spiral rod
83
, the gap between the fixed jaw
81
and the movable jaw
82
can be adjusted for wrenching different sizes of nuts or bolts.
In use, the spiral rod
83
is first rotated to adjust the gap between the fixed jaw
81
and the movable jaw
82
to meet the size of a work piece. Then the main body
8
is turned to wrench the work piece. However, in the case that the work piece is positioned in a narrow space and it is impossible for a user to completely wrench the wrench, the user will have to first wrench the main body
8
to a certain position and then retreat the movable and fixed jaws
82
,
81
from the work piece. Then the main body
8
is restored to the position prior to wrenching and then the movable and fixed jaws
82
,
81
are extended to again clamp and wrench the work piece. Such operation must be repeated for tightening or untightening the work piece. This is quite troublesome to the user.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a reversible adjustable wrench having a main body on which a slidable first jaw and a pivotally rotatable second jaw are disposed. When moving a stop block backward, a leaning section of the second jaw is free from the stopping force of a stop block, whereby the second jaw has a space for pivotal rotation. When the jaw section of the second jaw is moved back, a sufficient space is defined between the first jaw and the jaw section of the second jaw for avoiding a nut or a bolt. Accordingly, the wrench can be reversely wrenched.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2704476 (1955-03-01), Listoa
patent: 2769259 (1956-11-01), Healy
patent: 2846912 (1958-08-01), Day
patent: 3541898 (1970-11-01), Murata
patent: 5746099 (1998-05-01), Janson
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