US Patent 9706843 Display support device having a tightening unit

A display support device includes a support arm, a carrier unit, a positioning unit and a tightening unit. The support arm includes an arm main body, and first and second first sleeve portions respectively pivoted to two opposite ends of the arm main body. The carrier unit includes a first rotary tube connected to the first sleeve portion. The positioning unit includes a second rotary tube connected to the second sleeve portion. The tightening unit includes a tightening tube sleeved on one of the first and second rotary tubes, and an adjustable member operable to move and extend through one of the first and second sleeve portions so as to tighten the tightening tube on the one of the first and second rotary tubes.