Supporting apparatus for supporting an electronic device

1. A supporting apparatus adapted for supporting an electronic device, said supporting apparatus comprising:

an upper link having a front end and a rear end;

a fixed member disposed behind said upper link and adapted to be fixed on a support;

a first upper pivot for interconnecting pivotally said rear end of said upper link and an upper end of said fixed member;

a connecting member disposed in front of said upper link and adapted to be connected to the electronic device;

a second upper pivot for interconnecting pivotally an upper end of said connecting member and said front end of said upper link; and

a force-creating mechanism including

a swing rod having a rear pivot portion connected pivotally to said fixed member, said rear pivot portion being spaced apart from and disposed below said first upper pivot,

a movable unit connected to a front end of said swing rod, said connecting member and said upper link being operable to rotate an assembly of said movable unit and said swing rod about said fixed member, and

a biasing spring having a front end connected to said movable unit, and a rear end connected to said swing rod, movement of said movable unit relative to said swing rod resulting in a change to the distance between said front and rear ends of said biasing spring and, thus, the deformation degree of said biasing spring, so as to create a compensating torque that compensates for a gravitational torque of the electronic devices;

wherein said connecting member and said upper link are operable to convert said supporting apparatus between a horizontal state, where said upper link is horizontal, and an inclined state, where said upper link is inclined, the compensating torque increasing when said supporting apparatus is converted from said inclined state to said horizontal state;

wherein said swing rod further has a slide hole formed in said front end thereof and extending along a longitudinal direction of said swing rod, said movable unit being connected pivotally to said connecting member and said upper link at a front end thereof by said second upper pivot, and extending movably into said slide hole in said swing rod at a rear end thereof;

wherein said swing rod further has a stop flange extending radially and outwardly therefrom said movable unit further includin' a stop plate spaced apart from said stop flange of said swing rod, said biasing spring being a compression spring and being sleeved on said movable unit and said swing rod, said compression spring having two ends abutting respectively against said stop flange and said stop plate;

wherein said upper link includes two vertical side plates spaced apart from each other along a left-to-right direction, said stop plate being disposed between said side plates and including two opposite vertical side surfaces in slidable contact with said side plates., respectively, said movable unit further including a coupling sleeve disposed in front of and spaced apart from said stop plate, and an adjusting rod, said coupling sleeve being connected pivotally to said connecting member and said upper link by said second upper pivot, said stop plate being formed with a threaded hole therethrough, said coupling sleeve being formed with a through-hole aligned with said threaded hole in said stopplate, said adjusting rod having a rear end extending movably into said slide hole in said swing rod, said adjusting rod being engaged threadably within said threaded hole in said stop plate and extending through said through-hole in said coupling sleeve, said adjusting rod having a stop portion biased by said biasing spring to abut against a rear end of said coupling sleeve.

2. The supporting apparatus as claimed in claim 1 , wherein said adjusting rod further has an externally threaded portion disposed behind said stop portion and engaging said threaded hole in said stop plate, a sliding portion disposed behind said externally threaded portion and extending movably into said slide hole in said swing rod, a penetrating portion disposed in front of said stop portion and extending through said through-hole in said coupling sleeve, and an operable control portion disposed in front of said penetrating portion and allowing for manual operation to rotate said adjusting rod relative to said stop plate.

3. The supporting apparatus as claimed in claim 1 , further comprising a lower link disposed under said upper link, a first lower pivot for interconnecting pivotally a rear end of said lower link and a lower end of said fixed member, and a second lower pivot for interconnecting pivotally a lower end of said connecting member and a front end of said lower link, said upper and lower links cooperating with said fixed member and said connecting member to constitute a four-bar linkage mechanism, such that the compensating torque is created by said biasing spring.

4. The supporting apparatus as claimed in claim 3 , wherein said rear pivot portion of said swing rod is spaced apart from and disposed above said first lower pivot.