Patent ID: 6485006
Filing Date: 2002-11-26
Classification: E05D,E05Y,F16F,Y10S,Y10T

Abstract:
A plug mounted at one end of a torsional spring operatively connected to an overhead shaft of a counterbalancing mechanism, the plug comprising:a cylindrical collar coaxially mounted onto the overhead shaft, said collar comprising connecting means for connecting the end of the torsional spring onto the collar; and at least one flange projecting longitudinally along the shaft from the collar, said at least one flange being insertable into and cooperable with an aperture of a mating part of the counterbalancing mechanism so as to be interlocked with said aperture when tension is applied to the torsional spring; wherein said at least one flange comprises a hook-shaped ridge, whereby when tension is applied to the torsional spring, the plug rotates about the overhead shaft so that said ridge interlocks with a corresponding matching notch of the aperture.