Appeal No. 2006–0033 Παγε 6
Application No. 10/764,302
Gunnarson's wrench includes a C-shaped jaw A and a self-adjusting jaw B. The
C-shaped jaw A is provided with two series of teeth m and n at an angle to each other
which is determined by the leverage c1 of the jaw B and is calculated to grip the pipe on
two sides equally distant and opposite the grip of jaw B. The teeth m and n are
decreased in size toward the corner l in proportion with the pipes they work upon. The
C-shaped jaw A extends to pivot c in a curved shape, in order to give room for jaw B
when brought up close together. The self-adjusting jaw B, which is extended as a lever
d forming the handle of the wrench, is provided with a tooth curve o, gradually rising
from the pivot c in such a shape that when it is brought against any size pipe that can
be held by the C-shaped jaw A it will grasp any pipe at the same angle of levage ci1
from a line drawn through the pivot c to the center of each pipe. The teeth of the tooth
curve o decrease in size toward the end of the self-adjusting jaw B proportionally with
the pipes they act upon.
Figure 1 of Gunnarson depicts three positions of the wrench. The first position
depicted is the solid line position with pipe a grasped between the jaws A and B. The
second position depicted is the dotted line g position with pipe b grasped between the
jaws A and B. The third position depicted is the dotted line f position with a pipe
grasped between the jaws A and B.
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Last modified: November 3, 2007