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US 5,791,638 AGranted
Coil spring with ends adapted for coupling without welding
AssigneeBal Seal Engineering, Inc.
InventorPeter J. Balsells
Life of this patent
Estimating the term…
Abstract
Spring apparatus is provided which includes coil springs having intermediate and end coils suitable for interconnection in order to form a continuous spring which maintains a constant load-deflection characteristic over all intermediate coils unaffected by the joint end coils. This configuration therefore finds particular utility in providing bias without compromise of sealing, electromagnetic shielding and/or conductivity.
Claims17
Spring apparatus comprising:
- a coiled spring having two ends and a plurality of intermediate coils canted along a centerline of the coiled spring, each coil having a leading portion disposed at a front angle to a normal line to one centerline and a trailing portion disposed at a back angle to said normal line;
- and
- end coils congruent with said plurality of intermediate coils, disposed at the two ends and having back angle means, defining a trailing portion of at least one end coil, for locking the end coils together, the end coil trailing portion having a back angle different from the intermediate coil trailing portion back angle, said end coils having substantially smaller diameters than said intermediate coils, one of said end coils is a male end coil extending outwardly from the intermediate coils along the centerline and another of said end coils is a female end coil extending outwardly from the intermediate coils along the centerline.
Dependencies are inferred from the claim text.