Core guide assembly for stationery article

Details Core guide assembly for stationery article Core guide assembly for stationery article

2001-11-13

2003-09-02

Walczak, David J. (Department: 3751)

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

C401S075000

Reexamination Certificate

active

06612765

ABSTRACT:

BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a core guide assembly for a stationery article and, more particularly, to a core guide assembly for a stationery article which prevents separation of a core by way of a support protrusion.
(b) Description of the Related Art
A stationary article such as a glue, an eraser, a crayon and a pencil may be provided with a core guide assembly for guiding a bar-shaped core such that the core can be gradually exposed to the outside for use.
As shown in
FIGS. 1 and 2
, the stationery article includes a tube case
2
both ends of which are in an opening state, a bar-shaped core
1
mounted within the tube case
2
, a rotation unit
4
fitted to the one-sided end of the tube case
2
such that it can be rotated, and a core guide assembly
10
inserted into the tube case
2
such that it can move along the inner surface of the tube case
2
in the longitudinal direction. For instance, the bar-shaped core may be a glue stick.
The movement of the core guide assembly
10
is made by way of clockwise and anticlockwise rotations of the rotation unit
4
, and the one-sided end of the core guide assembly
10
partially supports the core
1
.
A cap
8
is externally fitted to the other-sided end of the tube case
2
such that it can intercept the core
1
from the outside. The cap
8
has a clip
9
for holding the article to a coat collar, or a pocket collar.
The rotation unit
4
includes a rotation member
5
fitted to the one-sided end of the tube case
2
such that it can be rotated, and an operation member
6
inserted into the tube case
2
such that it can be rotated together with the rotation member
5
. The operation member
6
mounts the core guide assembly
10
therein.
The core guide assembly
10
has a screw member
11
externally bearing a male screw, and a support member
12
moving together with the screw member
11
while partially supporting the core
1
.
One or more operation protrusions
7
are internally formed at the operation member
6
of the rotation unit
4
such that they are inserted into the grooves of the screw member
11
.
A guide groove
13
is longitudinally formed at the lateral side of the support member
12
, and a guide protrusion
3
is formed at the inner surface of the tube case
2
such that it is inserted into the guide groove
13
. The guide protrusion
3
guides the movement of the core guide assembly
10
in the longitudinal direction while prohibiting the rotation thereof.
When the rotation unit
4
is rotated with the formation of the operation protrusions
7
and the guide protrusion
3
, the operation member
6
is rotated in its own place because it is fitted to the tube case
2
while being prohibited in its movement in the longitudinal direction. Since the core guide assembly
10
where the screw member
11
thereof is fitted to the operation protrusions
7
is prohibited in its rotation by way of the guide protrusion
3
, the core guide assembly
10
performs its guiding operation while moving back and forth pursuant to the rotation of the rotation unit
4
.
As the core guide assembly
10
performs its guiding operation, the core
1
held by the support member
12
of the core guide assembly
10
is exposed to the outside, or intercepted from the outside.
A plurality of support protrusions
14
are formed at the inner surface of the support member
12
of the core guide assembly
10
to support the core
1
.
The core
1
occupying the charge space
15
of the support member
12
is partially held by the support protrusions
14
, and moves together with the core guide assembly
10
. The core
1
is partially influenced by the elastic force of the support member
12
that suffers expansion and contraction during the charge of the core
1
.
In operation, when the core guide assembly
10
moves forward pursuant to the rotation of the rotation unit
4
, the core
1
is pushed upward by way of the support member
12
so that the movement of the core
1
can be made in a smooth manner.
However, when the core guide assembly
10
moves backward, the core
1
also moves while being influenced by the elastic force of the support member
12
of the core guide assembly
10
, and held by the support protrusions
14
. In case the core
1
is formed with a soft material such as a solid paste, the core
1
is deformed due to the abrasion force occurring between the core
1
and the tube case
2
so that it slides over the support protrusions
14
. In this case, the core
1
is separated from the support member
12
so that the backward movement thereof cannot be made.
Particularly, in case the diameter of the core
1
is 10 mm or less, the supporting power of the support protrusions
14
becomes reduced, and this facilitates the separation of the core
1
from the support member
12
.
When the core
1
is separated from the support member
12
and the backward movement thereof is not made, the end portion of the core
1
is largely exposed to the outside of the tube case
2
. In this state, when the cap
8
is closed, the core
1
is partially attached to the cap
8
while being deformed in its shape and contaminating the surroundings.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a core guide assembly for a stationery article which has a cylinder-shaped support bar externally bearing a support protrusion to support a core in a stable manner.
This and other objects may be achieved by a core guide assembly for a stationery article with the following features.
The core guide assembly includes a screw member with a predetermined length while externally bearing a male screw. A support member is connected to the one-sided end of the screw member while centrally bearing a support bar protruded opposite to the screw member. The support bar has a support protrusion with one or more portions bearing a large volume in the radial direction.
The support protrusion is formed at the end portion of the support bar by one or two steps while bearing a shape of a cone or a disk.
Alternatively, the support protrusion portions are arranged at the support bar by two or more steps in a zigzag while bearing a shape of a semi-cone or a semi-disk. Furthermore, the support protrusion portions may be shaped with polygonal plates such as a rectangular plate.
The support protrusion may be formed with two or more stepped portions bearing a shape of a cone, a disk, or a polygonal plate. Furthermore, the support protrusion may have two or more stepped portions with a shape of a semi-cone, a semi-disk or a polygonal plate arranged in a zigzag such that the portions thereof are protruded opposite to each other with respect to the axis of the support bar.


REFERENCES:
patent: 2815123 (1957-12-01), Safianoff
patent: 4605330 (1986-08-01), Crowley et al.
patent: 6254325 (2001-07-01), Kun

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