Patent ID: 8905665
Filing Date: 2014-12-09
Classification: A45D,B43K,B43L

Abstract:
1. A retractable writing/erasing piece against sliding back, comprising: a holding pipe; an internal pipe, wherein the internal pipe has a fitting part and a protruding part along a length direction of the internal pipe, the fitting part is fitted in an internal part of the holding pipe, at least a pair of guide grooves is disposed on opposite sides of a pipe wall of the protruding part, each of the guide grooves is a stepped guide groove, which is stepped on both sides of the guide groove, each of the stepped guide grooves has multiple guide groove windows, each guide groove window has a blocking wall adjacent thereto, adjacent guide groove windows of the guide groove windows are arranged in a stepped shape and are connected to each other; a sleeve pipe, which covers an external part of the protruding part of the internal pipe, wherein at least a pair of spiral guide slots in an opposite direction is disposed on an internal wall of the sleeve pipe; a slide base, which is contained in an internal part of the protruding part of the internal pipe, wherein at least a pair of round guide protrusions in an opposite direction is disposed on the slide base, the pair of round guide protrusions passes through the guide grooves of the internal pipe and is contained in the pair of spiral guide slots of the sleeve pipe in a protruding manner; and an writing/erasing piece, fixed on the slide base.