Patent ID: 8615847
Filing Date: 2013-12-31
Classification: E05F,Y10T

Abstract:
1. A counterbalanced hinge assembly comprising: a hinge box; a support member rotatably attached to the hinge box for rotation about a rotation axis between a closed position and an open position; a linkage system interconnecting the hinge box and the support member; wherein the linkage system includes a wind-up link rotatably attached to the hinge box for rotation about a spring axis and extending radially away from the spring axis to a distal pivot axis laterally spaced from the spring axis, and a driven link having a first end rotatably attached to the wind-up link at the distal pivot point and a second end rotatably attached to the support member; and a planar coil spring coiled about the spring axis and coupled to both the hinge box and the wind-up link, wherein the planar coil spring applies a torque to the wind-up link to rotate the wind-up link about the spring axis to assist movement of the support member from the closed position into the open position.