US PATENT SUBCLASS 400 / 164
.~.~.~ Via helical arrangement of projections

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

139  DF  INCLUDING TYPE-SET-ASSEMBLAGE MOUNTED ON CARRIER AND RELATIVELY MOVABLE FOR SELECTION AND FOR IMPACT OF TYPE-FACE {11}
160  DF  .~ Imprint by pivoting of type-head-carrier and type-head against record-medium {7}
162  DF  .~.~ Type-head movable for selection of type-face {14}
164.~.~.~ Via helical arrangement of projections

DEFINITION

Classification: 400/164

Via helical arrangement of projections:

(under subclass 162) Subject matter wherein said selecting mechanism includes a rotatable cylindroidal member having elements on the cylindrical surface thereof that protrude from the surface, which elements are arranged to form a helix on the cylindrical surface and which elements engage portions of the selecting mechanism to connect the mechanism to a type-head* that supports the type-face* elements.