Abstract: An articulating arm for moving a first member with respect to a second member while maintaining the first member in the desired orientation with respect to the second member has first and second connectors and first and second arm members. The first arm member is tubular in shape with rectangular cross section, and the second arm member moves within the central opening of the first arm member. The ends of the first arm member are pivotally connected by pins to the first and second connectors and the ends of the second arm member are similarly connected by pins to the first and second connectors with the pins defining a parallelogram for maintaining the orientation of the second member with respect to the first. The first arm member has arcuate slots at the ends thereof to accommodate the pins which extend through the first and second connector members and the second arm member such that the second arm member can move with respect to the first arm member.