| 摘要 |
An automatic pencil includes an elongated tube an elongated tube having an upper open end, a tapered lower end, and a central bore formed therein. A plurality of leads are received in the elongated tube. A guiding device is mounted in the elongated tube near the lower end of the elongated tube for preventing the one of the leads from moving toward the upper end of the elongated tube. A propelling mechanism is provided for enabling the leads to enter the guiding device and protrude from the lower end of the elongated tube for writing purposes. The elongated tube has a plurality of positioning grooves of a predetermined length axially formed around an inner surface thereof near the upper open end. The central bore of the elongated tube has an upper section and a lower section the diameter of which is smaller than that of the upper section, so that a shoulder portion is formed below the positioning grooves. The lower section has a lower end adjacent to the guiding device, and a plurality of receiving grooves radially extending from the lower section for receiving the leads. Each of the receiving grooves is correspondingly aligned with the respective positioning groove and has an upper end communicating with the upper section.
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