Articulating support arm

An articulating support arm comprising:

• a base;
• a first link having a forward end having a pivotal connection to a control head and a rearward end having a pivotal connection to the base;
• a second link having a forward end having a pivotal connection to the control head at a location spaced rearward of the pivotal connection of the forward end of the first link to the control head, and the second link having a rearward end having a pivotal connection to the base at a location spaced rearward of the pivotal connection of the rearward end of the first link to the base, wherein a four bar linkage is formed by the pivotal connections of the base with the rearward ends of the respective first and second links and the pivotal connections of the control head with the forward ends of the respective first and second links;
• the control head further having a forward end having a pivotal connection to a platform;
• the platform being movable from a forward fully extended position to a rearward fully retracted position;
• wherein when the platform is in the forward fully extended position the platform extends forward from its pivotal connection to the control head, and the control head extends forward from its respective pivotal connections to first and second links, and the first and second links extend forward from their respective pivotal connections to the base;
• and
• wherein when the platform is moved to the rearward fully retracted position the platform extends forward from its pivotal connection to the control head, and the control head extends below and rearward of the base as the control head extends rearward from its respective pivotal connections to the first and second links, and the first and second links extend rearward from their respective pivotal connections to the base.