Abstract: A method of securing a torsion spring used in a counterbalance system in which the spring torsion cannot be released without first supporting any existing spring torque utilizes a torsion spring assembly including: a torsion rod extending along a longitudinal axis of and within a torsion spring; an anchor member retaining a first end of the torsion spring with the torsion rod being rotatable about the axis relative to the anchor member; and a winding cone retaining a second end of the torsion spring. The winding cone includes a first winding cone coupling member including a frusto-conical surface retaining the second end of the torsion spring; and a second winding cone coupling member and a fastener. The second coupling member defines an area in which the fastener is received for releasably mounting the second coupling member to the torsion rod. The first coupling member is disposed adjacent and abuts the second coupling member for limited rotational movement between first and second rotational positions.

Abstract: A mating assembly for sectional doors includes matable end portions formed on door sections with a first concave portion configured to accept a second convex portion with the concave portion and the convex portion having different curvature radii, the end portions being joined for relative movement by a pinned hinge member with the hinge pin having a series of lateral projections and the hinge member having stop members to engage the lateral projections to prevent hinge pin rotation.