A hinge mechanism comprising: a movable connector , a fixed connector , and a hinge assembly connected between the movable connector and the fixed connector and configured for enabling the movable connector to rotate relatively to the fixed connector , the hinge assembly comprising: a hinge four-rod mechanism using the fixed connector as a rack; and a first extension part served as an extension to a connecting rod in the hinge four-rod mechanism in a lengthwise direction of the connecting rod and rotatably connected to the movable connector , the hinge four-rod mechanism further comprising: a second extension part serving as an extension to a first side link in the hinge four-rod mechanism in a lengthwise direction of the first side link ; the first side link being relatively far from the first extension part among side links in the hinge four-rod mechanism and further comprising: a first connecting arm , wherein a first end of the first connecting arm is connected to the second extension part , a second end of the first connecting arm being rotatably connectable to the movable connector , when an opening angle of the movable connector is 0 to 50 degrees and until it reaches a closed position, wherein the first connecting arm has an allowance stretchable in a lengthwise direction thereof and has an elastic element for limiting recovery of the allowance after release of the allowance and/or limiting the release of the allowance, such elastic element exerting a force when an opening angle of movable connector is 0 to 50 degrees and not exerting any force when the opening angle of is 50 to 115 degrees, the end of the connecting arm engaging into the movable connector when the elastic element is exerting a force, wherein the fixed connector comprises a fixed portion and a bent portion bent on the fixed portion , the first side link is rotatably connected to the fixed portion , and a second side link on the hinge four-rod mechanism is rotatably connected to the bent portion , so that when the movable connector rotates such that at least a minimum included angle between the movable connector and the fixed portion exists, an end of the movable connector closest to the bent portion is within a region where the included angle between the fixed portion and the bent portion is located. a first connecting arm , wherein a first end of the first connecting arm is connected to the second extension part , a second end of the first connecting arm being rotatably connectable to the movable connector , when an opening angle of the movable connector is 0 to 50 degrees and until it reaches a closed position, wherein the first connecting arm has an allowance stretchable in a lengthwise direction thereof and has an elastic element for limiting recovery of the allowance after release of the allowance and/or limiting the release of the allowance, such elastic element exerting a force when an opening angle of movable connector is 0 to 50 degrees and not exerting any force when the opening angle of is 50 to 115 degrees, the end of the connecting arm engaging into the movable connector when the elastic element is exerting a force, wherein the fixed connector comprises a fixed portion and a bent portion bent on the fixed portion , the first side link is rotatably connected to the fixed portion , and a second side link on the hinge four-rod mechanism is rotatably connected to the bent portion , so that when the movable connector rotates such that at least a minimum included angle between the movable connector and the fixed portion exists, an end of the movable connector closest to the bent portion is within a region where the included angle between the fixed portion and the bent portion is located. <EOS>