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US 5,206,973 AGranted
Sound-deadener for window torsion balance
AssigneeCaldwell Manufacturing Company
InventorEdward L. Belcher
Life of this patent
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AssigneeCaldwell Manufacturing Company
InventorEdward L. Belcher
Estimating the term…
This invention, which provides a solution to the long-standing problem of motion-related rattle in torsion balances for windows, is based upon the discovery that the major source of the rattle is related to the movement of the free end of the twisted rod that is mounted within the coil of the torsion spring. A sound-deadening element of resin material is secured to the free end of the twisted rod, being positioned proximate to the extremity of the free end, and the preferred element has a maximum dimension (measured radial to the spring) that is greater than the maximum cross-sectional dimension of the twisted rod but less than the effective internal diameter of the coiled spring. The sound-deadening element eliminates the rattle by preventing contact between the free end of the rod and the spring, and it also acts as a glide to facilitate relative movement between the rod and the spring during operation of the balance.
A sound-deadened torsion balance for a window, sash movable relative to a cooperating window jamb, said balance having:
A sound-deadened twisted rod for a window torsion balance, said rod having a fixed end adapted for attachment to a window and a free end for insertion into said balance, and said balance including:
Dependencies are inferred from the claim text.