Abstract: A constant force spring system having a coil spring with first and second arms, a ramp for the second arm to contact and a pin mounted on a base. The coil spring is mounted on the pin and the ramp is positioned such that the second arm of the spring contacts the sloped surface of the ramp. When a force is applied to the first arm of the spring it tends to move the second arm up the sloped ramp. This interaction of the second arm and sloped surface produces a reaction force. The slope angle and ramp configuration is configured such that there are equal and opposite forces produced by the spring system.

Abstract: A V-shaped spring system has opposite ends formed by first and second arms and a pair of intermediate coil springs joined by a bridge. One of the coil springs pivotally receives a fixed axle, and the first arm extends from each spring. The second arms extends from the other spring. The spring operates to exert a substantially constant and limited force when the first arm is moved through an angle of up to 90.degree..