Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Reexamination Certificate
2001-03-12
2002-05-07
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
Reexamination Certificate
active
06382056
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to hand tools and, more specifically, to an adjustable wrench.
When operating a conventional adjustable wrench
100
, as shown in
FIG. 1
, the user may hold the adjustable wrench
100
in horizontal, and then rotates the adjusting worm
101
with the thumb to move the adjustable jaw
102
to the desired position. In order to let the adjustable jaw
102
be smoothly moved along the slide rails
104
of the fixed jaw (not shown), a clearance c is left between the slide rails
103
of the adjustable jaw
102
and the slide rails
104
of the fixed jaw. However, the moment produced by the weight w of the adjustable jaw
102
forces the adjustable jaw
102
to incline in one direction, thereby causing one slide rail
103
of the adjustable jaw
102
to attach one slide rail
104
of the fixed jaw. When moving the adjustable jaw
102
at this time, the rails
103
and
104
are rubbed against each other, causing an unstable movement of the adjustable jaw
102
. A conventional method of eliminating the aforesaid problem is to reduce the clearance c between the adjustable jaw and the fixed jaw. For example, ASME (The American Society of Mechanical Engineers) B107.8M-1996 defines that the clearance of the adjustable jaw must be as low as within 0.3 mm~0.47 mm. ISO (International Standard Organization) 6786-1982(E) defines that the clearance of the adjustable jaw must be as low as within 0.25 mm~0.36 mm when applying a slight side pressure on the adjustable jaw. The definitions of ISO and ASME do not stop the occurrence of friction between the slide rails of the adjustable jaw and the slide rails of the fixed jaw, i.e., these definitions do not eliminate the aforesaid problem.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide an adjustable wrench, which eliminates friction during movement of the adjustable jaw relative to the fixed jaw.
It is another object of the present invention to provide an adjustable wrench, which prevents the adjustable jaw from trembling in its moving direction when adjusted to the desired position.
To achieve the objects of the present invention, an adjustable wrench is provided comprised of a frame, having a handle, a fixed jaw and a track at one end of the handle. An adjusting worm pivoted to the frame for free rotation. An adjustable jaw mounted in the track and meshed with the adjusting worm and moved relative to the fixed jaw upon rotating the adjusting worm. Two spaces defined at two sides of the adjustable jaw within the track of the frame. At least one packing device provided in each of two spaces for preventing the friction between the side rails of the adjustable jaw and the side rails of the fixed jaw.
REFERENCES:
patent: 2722150 (1955-11-01), Green
patent: 4449431 (1984-05-01), Brunosson
patent: 5331868 (1994-07-01), Elmore
Browdy and Neimark , P.L.L.C.
Danganan Joni B.
Hail III Joseph J.
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