US Patent 10317058 Support arm device

A support arm device is pivotally connected between first and second link members, and includes a main arm, a seat member, an adjusting member, a driven member and a resilient member. The main arm is pivotally connected to the first and second link members. The seat member is movable relative to the main arm. The adjusting member is rotatably mounted to the main arm. The driven member is movably mounted to the main arm. Rotation of the adjusting member drives movement of the driven member to adjust a distance between the driven member and the seat member. The resilient member is coupled to the driven member and the seat member.