US PATENT SUBCLASS 24 / 509
.~.~.~.~ Coil spring

Current as of: June, 1999
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24 /   HD   BUCKLES, BUTTONS, CLASPS, ETC.

455  DF  CLASP, CLIP, SUPPORT-CLAMP, OR REQUIRED COMPONENT THEREOF {17}
489  DF  .~ Including pivoted gripping member {12}
499  DF  .~.~ Spring or resiliently biased about pivot {1}
500  DF  .~.~.~ Distinct spring {7}
509.~.~.~.~ Coil spring {1}
510  DF  .~.~.~.~.~> Having coil portion coaxial or parallel with pivotal axis

DEFINITION

Classification: 24/509

Coil spring:

(under subclass 500) Spring wound or molded in the form of at least two complete similarly shaped loops successively coiled around a common central axis.

(1) Note. The loops need not be circular in shape but the ends of the coil must at least subtend an arc at 720 deg. or greater.