Mechanism for operating the writing element of a pen, in particular, a ball-point pen comprises a soft, elastically deformable plastic tube (2) which is provided with constricted sections, and holds one or more balls

摘要

The mechanism for operating (extending and retracting) the writing element of a pen, in particular, a ball-point pen comprises a soft, elastically deformable plastic tube (2) which is provided with constricted sections (6), and accommodates one or more balls (5, 8) whose diameter is greater than the diameter of the tube at its constricted sections. The position of the balls (5, 8) joined to the writing element (1) fixes the latter relative to the pen casing with a certain elastic compliance.