Stock material or miscellaneous articles – Vehicle body ornament
Reexamination Certificate
1999-05-12
2001-06-19
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Vehicle body ornament
C428S119000, C428S120000, C428S134000, C428S137000, C264S001100, C264S045100, C264S328100, C264S241000, C293S102000, C293S120000
Reexamination Certificate
active
06248412
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a luster resin molding, for example, a long resin molding having metallic luster or the like obtained by mixing metallic pigment, and a method of manufacturing such a molding. Particularly, such a molding can be used as an automobile side molding formed of luster resin and such a method can be used as a method of manufacturing such an automobile side molding.
The present application is based on Japanese Patent Application No. Hei. 10-128656, which is incorporated herein by reference.
2. Description of the Related Art
As for an automobile molding as such a conventional luster resin molding, a technique shown in
FIG. 5
is known.
FIG. 5
is a sectional view of a conventional automobile molding taken perpendicularly to its longitudinal direction.
In the conventional automobile molding, a design surface
2
is provided on the front surface of a molding body
1
while a car-body attachment surface
3
is formed on the back surface. Two lines of double-side adhesive tapes
4
a
and
4
b
are pasted to the car-body attachment surface
3
. A cross-shaped positioning boss
5
is provided between the double-side adhesive tapes
4
a
and
4
b
so as to project from the molding body
1
. The positioning boss
5
is formed integrally with the back surface of the molding body
1
.
The automobile molding is attached to a car body
7
in such a manner as follows. The positioning boss
5
is inserted into a positioning hole
8
of the car body
7
. Pressure is applied to the molding body
1
in the state where the molding body
1
has been positioned onto the car body
7
. The molding body
1
is fixed to the car body
7
by the adhesive force of the double-side adhesive tapes
4
a
and
4
b
. In the conventional automobile molding, therefore, since the positioning boss
5
is provided so as to project from the molding body
1
, the molding body
1
can be attached to an accurate position of the car body
7
by the positioning boss
5
.
Another technique disclosed in Japanese Utility Model Publication No. Sho. 62-95960 is also known as an automobile molding having such a positioning boss.
If the molding body
1
and the positioning boss
5
were formed integrally, however, the following problem was caused. The problem will be described about a case where the cross-shaped positioning boss
5
is formed integrally with the molding body
1
by way of example.
FIGS. 6A and 6B
are explanatory views showing a relationship between the injection direction and distribution of metallic pigment when the positioning boss is formed integrally with the molding body
1
.
FIG. 6A
is a front view in which the longitudinal direction extends right and left, and
FIG. 6B
is a top plan view in which the longitudinal direction extends right and left.
The flow of synthetic resin in the molding body
1
is affected by the flow of resin into the cross-shaped positioning boss
5
A, so that the light distribution of metallic pigment near the cross-shaped positioning boss
5
A to the molding body
1
is as follows.
As shown in
FIG. 6A
, the flow velocity of a boss supply flow n near the central line X—X before flowing into the cross-shaped positioning boss
5
A does not change in comparison with that of a main flow m supplied by injection molding. However, the flow velocity of the boss supply flow n after flowing into the cross-shaped positioning boss
5
A becomes slower than the main flow m supplied by injection molding because the flow in the longitudinal direction of the molding body
1
is affected by the volume of the positioning boss
5
A. As a result, a flow-in phenomenon occurs in the downstream of the cross-shaped positioning boss
5
A so as to compensate the main flow n supplied by injection molding. For example, in the downstream of the cross-shaped positioning boss
5
A, the main flow n flows in the direction of the central line X—X of the cross-shaped positioning boss
5
A. But, the flow velocity of the main flow n flowing in the direction of the central line X—X becomes slower than that on its opposite sides because of the volume supplied in the longitudinal direction of the cross-shaped positioning boss
5
A, so that flow-in streams o and g is generated in the opposite sides. These flow-in streams o and g move round from the opposite sides of the positioning boss
5
A, and then flow in the direction of the central line of the main flow n. The position where the flow-in streams o and g run against each other appears in the downstream of the cross-shaped positioning boss
5
A.
Reduction of flow velocity caused by confluence of these flow-in streams o and g results in turbulence of distribution of synthetic resin blended with metallic pigment in the downstream of the cross-shaped positioning boss
5
A. As a result, a black line p of a flow of synthetic resin appears in the downstream of the cross-shaped positioning boss
5
A. Accordingly, the external appearance of the molding becomes bad.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a luster resin molding and a manufacturing method thereof, in which the portion of the design surface corresponding to a positioning boss of a body can be continued to another portion of the design surface to result in good appearance.
According to the present invention, there is provided a luster resin molding comprising a body formed of luster resin; a substantially cylindrical boss formed on a back surface of the body integrally therewith so as to erect in a direction substantially perpendicular to the back surface of the body; and a notched end portion provided on an opposite side of the boss to the body so as to have an end face inclined with respect to the direction of erection.
Further, according to the present invention, a method of manufacturing a luster resin molding is provided, which comprises the steps of: providing a first core having a first cavity for molding a body of the luster resin molding and a second cavity for molding a boss to be formed on a back surface of the body integrally therewith so as to erect in a direction substantially perpendicular to the back surface of the body; providing a second core in the second cavity of the first core at a first position, the second core being movable in the second cavity; injecting luster resin into the first cavity; and moving the second core from the first position to a second position after the injected luster resin has passed through a position in which the boss is to be molded.
Features and advantages of the invention will be evident from the following detailed description of the preferred embodiments described in conjunction with the attached drawings.
REFERENCES:
patent: 4220681 (1980-09-01), Narita
patent: 4298640 (1981-11-01), Katoh
patent: 4305981 (1981-12-01), Muroi et al.
patent: 4332412 (1982-06-01), Nakazawa et al.
patent: 4536937 (1985-08-01), Nagasaka
patent: 4613937 (1986-09-01), Fujita
Hyuga Hiromi
Kawashima Daiichiro
Mukai Hiroshi
Ogiso Koichi
Bahta Abraham
Jones Deborah
Pillsbury & Winthrop LLP
Toyoda Gosei Co,., Ltd.
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