Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Removing surface portion of composite workpiece to expose...
Patent
1994-06-30
1995-11-21
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Removing surface portion of composite workpiece to expose...
156247, 264149, 264167, 2641772, 264252, 264344, 26417317, 425113, 425381, 425465, 425466, B29C 4702
Patent
active
054684382
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a production method of a long molding strip.
DESCRIPTION OF THE PRIOR ART
Lengthy strips of decorative molding are often used on exterior surfaces of marine vessels, vehicles, building materials and other general machinery and equipment. For example, windshield moldings, side moldings and bumper moldings are usually installed to the edges of the windshield openings and side surfaces of body panels of automobiles and to bumpers thereof.
These moldings usually consist of lengthy extruded resin strips extruded through an extruding dies wherefrom said extruded resin molding strips are extruded with a specific cross sectional shape before being cut to a prescribed unit length.
To produce various types of these kinds of moldings, different molding strip production methods have been disclosed wherein a molding strip is extruded in a specific cross sectional shape before removing a portion of said molding strip by passing said strip through a prescribed cutting process, thus making the cross sectional shape of the molding strip vary along its length. For example, the production methods disclosed in Japanese Utility Model Laid-Open Publication No. 32915/1988, Japanese Utility Model Laid-Open Publication No. 128412/1989 and Japanese Utility Model Laid-Open Publication No. 130816/1989 call for removal, by a cutting process, of the inner peripheral portion of the decorative part of a molding strip which cover up the edges of the windshield glass of an automobile and for equipping a dam portion along the cut.
With some bumper moldings, the molding strip and the mounting pieces which support the molding strip exposing to the outer from the back are extruded integrally before removing a superfluous portion of the mounting pieces by a cutting process so as to see the remaining mounting pieces into the bumper surface for fixing the molding strip onto the bumper.
Production methods are disclosed in Japanese Patent Laid-Open Publication No. 112845/1983 and Japanese Utility Model Laid-Open Publication No. 76057/1987 wherein a molding strip is extruded in a hollow sectional shape for the purpose of making the molding of lighter in weight but providing resin-filled ribs several sections along the length as reinforcing ribs. Said resin-filled ribs functioning as reinforcing ribs work to maintain a uniform, solid external appearance, therefore, such reinforcing ribs are often positioned at the bent sections of a molding. Hollow moldings are extruded, for example, in a C-shaped section and the reinforcing ribs are formed to fill the hollow section of the C-shape at prescribed distances.
Further,in regard to the windshield molding strips for automobiles, Japanese Patent Laid-Open Publication No. 291721/1988 discloses a windshield molding strip to be installed to cover the upper and side edges of a windshield glass and Japanese Patent Laid-Open No. 289716/1989 etc., disclose an automotive windshield molding strip equipped with a conduit groove which functions as a rainwater flume. With conventional production methods for molding provided with the flume, a molding strip with the flume and one without such flume are separately extruded before joining the two strips together using joints or the like.
In fact, however, with conventional molding production methods employing a cutting process for the above-mentioned purpose, the potential for shaping in the cutting process is limited and, especially, a cutting process to hollow out the section shape by undercutting is generally impossible. Also, when the cutting length is in a longer range, very large sized dies become necessary.
Furthermore, when forming the filled ribs to function as reinforcing ribs with a molding, "padding" is placed at several sections of a molding, but with such conventional production methods, an additional process becomes necessary to join separate parts which were extruded separately. In other words, with conventional production methods of the above-mentioned type of molding, it has not been possible to
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patent: 5267846 (1993-12-01), Miyama et al.
patent: 5332541 (1994-07-01), Tamura
Thurlow Jeffery R.
Tokai Kogyo Kabushiki Kaisha
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