| 摘要 |
<p>Disclosed is a core-breaking-proof and core-jamming-proof mechanical pencil, comprising a core-guiding barrel (6), a core-storing barrel (17), and a lead core (1). The core-guiding barrel is provided on the outer contour body (24) thereof with a left half-open trapezoidal groove (27) and a right half-open trapezoidal groove (28), the core-storing barrel is provided on two sides of the outer contour body thereof with a left half-open trapezoidal groove and a right half-open trapezoidal groove, where the widths of inner groove openings of the trapezoidal grooves are less than the diameter of the lead core (1). Also provided are a core-propelling mechanism, a core-locking mechanism, and an eraser (11) that matches a pencil cap (12). The eraser has embedded at the center portion thereof a liner barrel (10). The liner barrel is provided with a center hole (34). The pencil automatically propels the core. The length of the core propelled is controlled between 0.2 and 0.5 millimeters. The core is provided with protection throughout the entire process of sliding downwards. This ensures the core-breaking-proof and core-jamming-proof features when writing.</p> |
