Patent ID: 8593807

Claim:
Electronic equipment, comprising: a first housing having a first surface defining a first principal plane; a second housing having a second surface defining a second principal plane, rotatably mounted to said first housing about an axis substantially parallel to the first and second principal planes, and rotatable from a first position in which the first surface and the second surface face each other to a second position in which the first surface and the second surface are exposed from each other; and a lock member rotatably mounted, about an axis substantially parallel to the axis of rotation between the first and second housings, to an exterior surface of the second housing at a position opposite to the position where the second housing is rotatably mounted to the first housing, the lock member comprising: a hook configured to engage a surface of the first housing that faces away from the second housing when the first and second housings are in the first position, the lock member being rotatable from a third position in which the hook prevents movement of the first and second housings between the first and second positions and a fourth position in which the hook is disengaged from the first housing to permit movement of the first and second housings between the first and second positions; and a contact portion configured to be contacted by a user to rotate the lock member from the third position to the fourth position, wherein a direction of rotational movement by the second housing from the first position to the second position is the same as a direction of rotational movement by the lock member from the third position to the fourth position, the hook comprises an inner surface that contacts the surface of the first housing that faces away from the second housing in the third position, and the inner surface of the hook defines an angle in a range of 5 to 45 degrees with respect to a tangent at an intersection of the hook and a movement path of the hook when the lock member is rotated.