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US 8,939,438 B2Granted
Plastic spring and method and apparatus for making the same
AssigneeLee Spring Company LLC
InventorsStephen Kempf, Albert Mangels, Subramanya Naglapura, Sean Diamond, Brian Moulder, Brian Straiton
Life of this patent
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Abstract
This invention provides a helical spring formed of plastic material, comprising a pair of end coils situated at respective ends of said helical spring; at least one full pitch active coil between said pair of end coils; a pair of transition coils, each transition coil interconnecting an end of a respective end coil to an end of a respective proximate full pitch active coil, and having a varying pitch.
Claims6
A helical spring formed of plastic material, comprising:
- a pair of end coils situated at respective ends of said helical spring;
- at least one full constant pitch active coil between said pair of end coils;
- a pair of transition coils, each transition coil interconnecting an end of a respective end coil to an end of a respective proximate one of said full constant pitch active coils, and
- wherein the pitch of each of said transition coils varies gradually and continuously from substantially said full pitch at a first point of connection of said transition coil to said respective proximate full constant pitch coil to a pitch angle of substantially zero at a second point of connection of said transition coil to said respective end coil.
1 more element
Dependencies are inferred from the claim text.