US PATENT SUBCLASS 400 / 266.2
.~.~.~ Including adjustable counterbalance spring


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

251  DF  CASE-SHIFT MECHANISM {14}
264  DF  .~ For shifting platen {3}
266  DF  .~.~ Mounted on pivotally movable platen carrier {3}
266.2.~.~.~ Including adjustable counterbalance spring


DEFINITION

Classification: 400/266.2

Including adjustable counterbalance spring:

(under subclass 266) Subject matter wherein the platen* and the structure that moves the platen has mass that exerts a downward force, and wherein the typewriter is provided with a component or assemblage of elements that exerts an upward force on the said structure to compensate for this downward force of said structure, which component or assemblage of elements is resilient and the upward force exerted by the component or assemblage is variable.