US PATENT SUBCLASS 81 / 343
.~.~ With means to choose one of a plurality of actuator leverages

Current as of: June, 1999
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81 /   HD   TOOLS

300  DF  TOOL JAW(S) POSITIONED BY RELATIVELY MOVABLE PLURAL HANDLES (E.G., PLIERS) {15}
342  DF  .~ Jaw-actuating means (handle-manipulation conversion) {10}
343.~.~ With means to choose one of a plurality of actuator leverages {1}
344  DF  .~.~.~> Predetermined and discrete member of leverage selections

DEFINITION

Classification: 81/343

(under subclass 342) Tools including structure providing more than one ratio of relative handle movement to relative jaw movement (e.g., mechanical advantage or leverage to actuate the jaws for movement) and further including structure to select or predetermine one desired ratio out of the plurality of ratios available.

(1) Note. Though actuators which include cam means or toggle-link means may be considered as mechanisms for varying the leverage, so that in effect more than one ratio of handle

movement to jaw movement throughout actuation is inherent in these exemplary structures, such means, per se, are not included in this or indented subclasses. If, on the other hand, a cam actuator is provided with discrete cam surfaces or with separate means to choose a particular portion of a cam surface, whereby the user may select one of the surface or surface portions for the ratio desired, or a toggle-link actuator is provided with a separate means to vary inherent ratio of the toggle-linkage, whereby the user may change or preset the ratio to that desired, tools including such actuators are classified herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

361, for sliding-jaw cam actuators.

363, and 367+, for toggle-link actuators.

SEE OR SEARCH CLASS 74, Machine Element or Mechanism,

516+, for control linkages including variable output and input forces.