US PATENT SUBCLASS 400 / 440
.~.~ Attached to key lever (e.g., tension spring)


Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

383  DF  TYPE-BAR-ACTION MECHANISM OR TYPE-FACE ON TYPE-BAR OR TYPE-FACE INKER {19}
436  DF  .~ Type-bar return spring connected to type-bar-action linkage {4}
440.~.~ Attached to key lever (e.g., tension spring) {2}
440.1  DF  .~.~.~> Compression spring
440.2  DF  .~.~.~> Cantilever spring (e.g., torsion, hairpin, etc.)


DEFINITION

Classification: 400/440

Attached to key lever (e.g., tension spring):

(under subclass 436) Subject matter wherein said resilient or yieldable means is fastened to the key* lever of the typewriter.

(1) Note. The term "key lever" is defined in the definition of subclass 472 below.

(2) Note. The typewriter of this subclass is usually provided with a tension spring (i.e., a spring which exerts force when its ends are pulled apart).