Patent Number: 6,254,296

Title: Automatic pencil structure

Abstract: An automatic pencil structure includes a barrel, a tip cover, a connecting barrel, and a conducting tube. The barrel is provided with an inner thread screwed on an outer thread of the connecting barrel. The tip cover has a rear portion provided with a sleeve fitted in the connecting barrel and a front portion receiving the slide member. The slide member has a front portion protruding outward from the tip cover and a rear portion including a retaining ring for retaining the pencil lead by a friction action. The clip member has two opposite sides each defining an arcuate recess receiving a ball. The clamp ring is enclosed around the clip member has a bottom defining an inclined surface urged on the ball and a top defining a locking hole for securing the conducting tube and a pencil lead hole allowing passage of the pencil lead. The conducting tube defines a passage for receiving the pencil lead. The passage is connected to the pencil lead hole of the clamp ring and has a top defining an inner curved portion.

Inventors: Sheu; Rong-Lin (Taichung, TW)


International Classification: B43K 21/22 (20060101); B43K 21/00 (20060101); B43K 021/22 ()

Expiration Date: 07/03/2018