Appeal No. 2005-1173 Page 8
Application No. 10/134,793
on the plunger which retains the nut. Figure 1 depicts the relative size and location of
the plunger assemblies in a standard wrench. The protrusion of the plunger into the
throat of either the open or box end need only be approximately 1/32 of an inch. The
location of the assemblies can be on either side of the open or box end. Figure 2
shows a detail of the plunger assembly itself. It can easily be seen that the amount of
pressure on the plunger can be adjusted by the amount that a setscrew is screwed into
the drilled and threaded hole.
White's invention is directed to wrenches and more particularly to open-end and
box end wrenches, adjustable and non-adjustable as well as ratchet type and spanner
wrenches. A drawback to end wrenches, both open and closed end, is the tendency of
the wrench to slip off of the head of the nut or bolt during adjustment. This tendency is
especially critical when the wrench is in an odd position or the person using the wrench
is positioned awkwardly and has difficulty in reaching the nut or bolt. The user of the
wrench is often times given to fumbling with an index finger or use of the other hand to
position the head of the wrench while turning the wrench and nut.
White discloses a self-positioning wrench, i.e., a wrench that will position itself on
the head of the nut or bolt for tightening or loosening. His invention is directed to any
type of end wrench or spanner wrench, but it works particularly well with open-end
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