Patent ID: 6254296
Filing Date: 2001-07-03
Classification: B43K

Abstract:
An automatic pencil structure comprising:a barrel (1), a tip cover (2), a connecting barrel (3), a slide member (4), a spring (43), a pencil lead (5), a clip member (6), a clamp ring (7), and a conducting tube (8), wherein,said barrel (1) is provided with an inner thread (11);said tip cover (2) has a rear portion provided with a sleeve (21) fitted in said connecting barrel (3) and a front portion for receiving said slide member (4);said connecting barrel (3) is provided with an outer thread (31) screwed in said inner thread (11) of said barrel (1), said connecting barrel (3) having a top defining a conducting hole (32) for receiving said conducting tube (8);said slide member (4) having a front portion protruding outward from the front portion of said tip cover (2) and defining a through hole (44) for receiving said pencil lead (5) and a rear portion including a retaining ring (41) mounted therein for retaining said pencil lead (5) by a friction action;said clip member (6) is located above said slide member (4) and defines a holding portion (61) for holding said pencil lead (5) therein, said clip member (6) having two opposite sides each defining an arcuate recess (62) for receiving a ball (63);said spring (43) is mounted between said slide member (4) and said clip member (6) and has a front portion secured on said retaining ring (41) of said slide member (4) and a rear portion secured on said clip member (6);said clamp ring (7) is secured in said sleeve (21) of said tip cover (2) and is enclosed around an outer periphery of said clip member (6), said clamp ring (7) having a bottom defining an inner inclined surface (71) urged on said two balls (63) and a top defining a locking hole (72) for securing a lower portion of said conducting tube (8), said locking hole (72) having a bottom having a center defining a pencil lead hole (73) for allowing passage of said pencil lead (5); andsaid conducting tube (8) is secured in said conducting hole (32) of said connecting barrel (3) and has its lower portion secured in said locking hole (72) of said clamp ring (7), said conducting tube (8) defining a passage (81) for receiving said pencil lead (5) therein, said passage (81) connecting to said pencil lead hole (73) of said clamp ring (7) and having a top defining an inner curved portion (82).