Propelling pencil with conical clamping grip - has lengthwise grooves and overlapping open-ended slots in clamping ring offset in peripheral direction

摘要

The propelling pencil has a conical clamping grip spring-loaded against a sliding clamping ring, the grip being coupled to a lead chamber which is made to slide in the lengthwise direction by a pushbutton. A lead tube has an internal lead brake. The clamping ring (1) has one or more lengthwise grooves (3, 3') shorter than it and it also contains slots (2, 2') which are open at the ends and offset in the peripheral direction from the grooves, which they overlap (a).