Support device with two constant force springs

A support device for supporting a monitor, comprising:

• an upright frame including an upright frame body, an upper member connected to a top end of said upright frame body and defining an upper receiving space, and a lower member connected to a bottom end of said upright frame body and defining a lower receiving space, said upright frame body including two opposite side walls, an intermediate wall interconnecting said side walls, two first slide grooves that are respectively formed in said side walls, that are located at one side of said intermediate wall and that communicate with said upper receiving space, and two second slide grooves that are respectively formed in said side walls, that are located at an opposite side of said intermediate wall and that communicate with said lower receiving space, each of said first and second slide grooves extending along a length direction of a corresponding one of said side walls;
• an upper constant force spring configured as a rolled metal strip and including a coiled portion disposed in said upper receiving space, and a free end connected to said coiled portion;
• a lower constant force spring configured as a rolled metal strip and including a coiled portion disposed in said lower receiving space, and a free end connected to said coiled portion of said lower constant force spring;
• a first slide unit slidably mounted on said upright frame body, configured to be connected with the monitor, and including a first slide seat disposed on said one side of said intermediate wall and having two first protrusions received respectively in said first slide grooves, and an upper connecting piece disposed on a top portion of said first slide seat and connected to said free end of said upper constant force spring;
• and
• a second slide unit slidably mounted on said upright frame body and including a second slide seat disposed on said opposite side of said intermediate wall and having two second protrusions received respectively in said second slide grooves, and a lower connecting piece disposed on a bottom portion of said second slide seat and connected to said free end of said lower constant force spring.