Inertia pen with slidable sleeve

摘要

This invention relates to inertia pens, or writing or marking devices wherein a sleeve is shifted by axial impulse between a position exposing the writing tip and a position enclosing the writing tip. The kinetic energy of the impulse is transmitted to a calibrated mass slide within the pen which slide transfers its energy to the sleeve. A return spring is utilized and the pen may be simple, compound, binary or multifunctional. By obviating the push button or other manual actuator, writing or marking elements may be provided at both ends.