Coating implements with material supply – Solid material for rubbing contact or support therefor – Including holder
Reexamination Certificate
2003-12-19
2004-07-27
Nguyen, Tuan N. (Department: 3751)
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including holder
C401S089000, C401S092000, C401S094000, C401S086000
Reexamination Certificate
active
06767150
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automatic pencil assembly, and more particularly to an automatic pencil assembly, wherein the lead is pressed downward to overcome the holding force of the clamping members, so that the lead is inserted into and protruded outward from the slide easily and conveniently.
2. Description of the Related Art
A conventional automatic pencil in accordance with the prior art shown in
FIG. 16
comprises a barrel
100
, a point
200
mounted on a first end of the barrel
100
and having a first end formed with a sleeve
201
inserted into the first end of the barrel
100
, an urging member
203
secured in the sleeve
201
of the point
200
and having an inner wall formed with a tapered face
207
, two clamping members
202
each slidably mounted in the urging member
203
and having an outer wall formed with a cavity
204
for receiving a plurality of balls
205
which are urged on the tapered face
207
of the urging member
203
to contract the two clamping members
202
inward, a slide
300
slidably mounted in the point
200
and having a first end provided with a retaining race
400
and a second end protruded outward from a second end of the point
200
, a spring
206
mounted in the first end of the slide
300
and urged between the slide
300
and the clamping members
202
, a guide pipe
600
mounted in the barrel and rested on an end of the urging member
203
, a lead
500
in turn extended through the guide pipe
600
, the clamping members
202
, the retaining race
400
and the slide
300
and protruded outward from the slide
300
, and a cap
700
mounted on a second end of the barrel
100
and provided with an eraser
701
.
In operation, the cap
700
is removed from the barrel
100
, so that the lead
500
is placed into the barrel
100
. Then, the lead
500
is in turn extended through the guide pipe
600
, the clamping members
202
, the retaining race
400
and the slide
300
and protruded outward from the slide
300
. Thus, when the lead
500
is rested on a paper (not shown), the paper applies a reaction force on the slide
300
to draw the lead
500
outward from the slide
300
automatically.
However, the user needs to slightly shake the barrel
100
to facilitate the lead
500
sliding into the slide
300
, thereby causing inconvenience to the user. In addition, when the lead
500
has a greater length, the lead
500
is slightly bent due to its greater length, so that the lead
500
cannot pass through the slide
300
smoothly and is easily jammed or broken. Further, the barrel
100
cannot carry spare leads, thereby causing inconvenience to the user.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an automatic pencil assembly, wherein the lead is pressed downward by the first plug or second plug of the push member to overcome the holding force of the clamping members, so that the lead is inserted into and protruded outward from the slide easily and conveniently.
Another objective of the present invention is to provide an automatic pencil assembly, wherein the extension of the cap is used to store a plurality of spare leads, thereby facilitating the user carrying the leads.
A further objective of the present invention is to provide an automatic pencil assembly, wherein the rectangular guide hole of the guide pipe only allows passage of one lead, thereby preventing the leads from jamming.
A further objective of the present invention is to provide an automatic pencil assembly, wherein the guide pipe is formed be combining two semi-circular tubular together, so that the guide pipe is made easily and rapidly, thereby decreasing costs of fabrication.
A further objective of the present invention is to provide an automatic pencil assembly, wherein the rectangular guide hole of the guide pipe facilitates passage of the lead, so that the lead is moved in the rectangular guide hole of the guide pipe smoothly and conveniently.
A further objective of the present invention is to provide an automatic pencil assembly, wherein the first end of the barrel is formed with an inner thread, and the sleeve of the point is formed with an outer thread screwed into the inner thread of the barrel, so that the point is combined with the barrel easily and conveniently.
In accordance with the present invention, there is provided an automatic pencil assembly, comprising:
a barrel, a point, an urging member, two clamping members, a slide, a guide pipe, a lead, a cap, and a push member, wherein:
the barrel has a first end and a second end;
the point is mounted on the first end of the barrel and has a first end formed with a sleeve inserted into the first end of the barrel;
the urging member is mounted in the first end of the barrel and is secured in the sleeve of the point;
each of the two clamping members is slidably mounted in the urging member;
the slide is slidably mounted in the point and has a first end provided with a retaining race and a second end protruded outward from a second end of the point;
the guide pipe is mounted in the barrel and is rested on an end of the urging member;
the lead is in turn extended through the guide pipe, the clamping members, the retaining race and the slide and has a first end protruded outward from the guide pipe and a second end protruded outward from the slide;
the cap is mounted on the second end of the barrel and has an end formed with a cylindrical extension extended into the barrel; and
the push member is mounted on an end of the extension of the cap to seal the extension of the cap and is rested on the first end of the lead, the push member has a first end formed with a first plug that is insertable into the extension of the cap and a second end formed with a second plug that is insertable into the extension of the cap.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 3947133 (1976-03-01), Kageyama et al.
patent: 4538934 (1985-09-01), Brunner
patent: 6254296 (2001-07-01), Sheu
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