US Patent 9980561 Mobile multimedia workstation with novel clamp

A mobile multimedia workstation comprises a base and a mobile component attached to the base bottom side. First and second upright members are attached to the top side and spaced apart to define an opening. A clamp having first and second clamp faces is connected by an adjustable member extending through the opening. The adjustable member is adjustable to urge the first and second clamp faces toward each other to apply a compressive force to first and second upright members and thereby hold a vertical position of the clamp. The clamp further comprises a first and a second protrusion each extending inwardly from the respective first and second clamp face and disposed within the opening between the first and second upright members.