Coating implements with material supply – Solid material for rubbing contact or support therefor – Including holder
Reexamination Certificate
2000-10-06
2001-07-03
Walczak, David J.. (Department: 3751)
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including holder
C401S086000
Reexamination Certificate
active
06254296
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automatic pencil structure.
2. Description of the Related Art
A conventional automatic pencil structure in accordance with the prior art shown in
FIGS. 1 and 2
comprises a tip cover
90
having a smooth outer inclined surface
902
, a connecting barrel
91
formed on the tip cover
90
and fitted in a barrel (not shown), a slide member
92
slidably mounted in the tip cover
90
, a pencil lead
93
, a retaining ring
94
for retaining the pencil lead
93
, a clip member
95
defining a holding portion
950
for holding the pencil lead
93
and having two sides each defining a recess
952
for receiving a ball
954
, a clamp ring
96
mounted around the clip member
95
, and a spring
98
mounted between the clip member
95
and the slide member
92
.
In use, the pencil lead
93
is pushed outward automatically by the reaction on the slide member
92
exerted by the paper without needing any pressing or operation action.
However, the inner diameter of the holding portion
950
of the clip member
95
is greater than the outer diameter of the pencil lead
93
so that multiple pencil leads
93
are easily blocked in the holding portion
950
of the clip member
95
as shown in
FIG. 2
, thereby breaking the pencil leads
93
. In addition, the connecting barrel
91
of the tip cover
90
is fitted in the barrel, and the outer inclined surface
902
of the tip cover
90
is smooth so that the connecting barrel
91
of the tip cover
90
is not easily detached from the barrel, thereby causing inconvenience in replacing the pencil leads
93
.
SUMMARY OF THE INVENTION
The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional automatic pencil structure.
In accordance with one aspect of the present invention, there is provided an automatic pencil structure comprising:
a barrel, a tip cover, a connecting barrel, a slide member, a spring, a pencil lead, a clip member, a clamp ring, and a conducting tube, wherein,
the barrel is provided with an inner thread;
the tip cover has a rear portion provided with a sleeve fitted in the connecting barrel and a front portion for receiving the slide member;
the connecting barrel is provided with an outer thread screwed in the inner thread of the barrel, the connecting barrel having a top defining a conducting hole for receiving the conducting tube;
the slide member having a front portion protruding outward from the front portion of the tip cover and defining a through hole for receiving the pencil lead and a rear portion including a retaining ring mounted therein for retaining the pencil lead by a friction action;
the clip member is located above the slide member and defines a holding portion for holding the pencil lead therein, the clip member having two opposite sides each defining an arcuate recess for receiving a ball;
the spring is mounted between the slide member and the clip member and has a front portion secured on the retaining ring of the slide member and a rear portion secured on the clip member;
the clamp ring is secured in the sleeve of the tip cover and is enclosed around an outer periphery of the clip member, the clamp ring having a bottom defining an inner inclined surface urged on the ball and a top defining a locking hole for securing a lower portion of the conducting tube, the locking hole having a bottom having a center defining a pencil lead hole for allowing passage of the pencil lead; and
the conducting tube is secured in the conducting hole of the connecting barrel and has its lower portion secured in the locking hole of the clamp ring, the conducting tube defining a passage for receiving the pencil lead therein, the passage connecting to the pencil lead hole of the clamp ring and having a top defining an inner curved portion.
REFERENCES:
patent: 2596234 (1952-05-01), Gartenmann
patent: 3836264 (1974-09-01), Saito et al.
patent: 4056325 (1977-11-01), Maruyama
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