Supporting shelf

A supporting shelf, comprising:

• a bearing seat having a fixing part, a first connecting part pivotally connected with said fixing part and defining two first slideways at two opposing walls thereof, a first pin-connected part having an first axle at opposing ends thereof, each of said first axles fitting within said first slideways;
• and a first fixing screw rod screwed on said first connecting part and screwed through said first pin-connected part;
• a pin-connected mechanism, including a bracket having a front part and a rear part, a second connecting part connected with said front part and defining two second slideways at two opposing walls thereof, a second pin-connected part having an second axle at opposing ends thereof, each of said second axles fitting within said second slideways and a second fixing screw rod screwed on said second connecting part and screwed through said second pin-connected part;
• a first supporting arm having an end pivotally connected with said first connecting part and the other end pivotally connected with said rear part of said bracket, said first supporting arm including a first gas spring positioned in an inner portion of said first supporting arm and a first cross rod disposed at said inner portion of said first supporting arm;
• a first end of said first gas spring being pivotally connected to said first cross rod;
• a second end of said first gas spring being pivotally connected to said first pin-connected part;
• a second supporting arm having an end pivotally connected with said front part of said bracket, said second supporting arm including a second gas spring positioned in an inner portion of said second supporting arm and a second cross rod disposed at said inner portion of said second supporting arm;
• a first end of said second gas spring being pivotally connected to said second cross rod;
• a second end of said second gas spring being pivotally connected to said second pin-connected part;
• a third supporting arm having an end pivotally connected with the other end of said second supporting arm;
• a joint pivotally connected with the other end of said third supporting arm;
• and
• a setting seat pivotally connected with the joint.