Hinge mechanism with positive engagement locking

In a hinge mechanism, a first hinge portion 1 and a second hinge portion 40 are urged toward predetermined angular relationships relative to one another. A force, directed outwardly from the first hinge portion, is applied by an axle 20, 28 pivotally connecting the first and second hinge portions and having a V-shaped tip 27 against a V-shaped groove 14 in the second hinge portion, urging the V-shaped tip and groove to engage. In addition to being urged toward predetermined angular relationships, the first and second hinge portions are kept in predetermined angular relationships until a torsional force is applied to one of the hinge portions to overcome forces keeping the V-shaped tip and groove in engagement. The force may be applied by a resilient member such as a coil spring so acting between two axles 20, 28. The hinge may be used in an apparatus such as a cellular telephone. <IMAGE>