Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
1999-05-18
2001-06-19
Tentoni, Leo B. (Department: 1732)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S423000, C264S572000, C425S130000
Reexamination Certificate
active
06247220
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for fabricating a casing, more particularly to a method for fabricating a casing having tubular screw posts that can simplify fabrication to enhance production efficiency.
2. Description of the Related Art
Gas-assisted injection molding methods have been widely used in fabricating casings, such as computer casings, in order to enhance strength and reduce sink marks. However, casings fabricated by a conventional gas-assisted injection molding method which employs gas supplying pins, are usually formed with extra projections at locations where the gas supplying pins are disposed. As these projections are undesirable and can interfere with assembly of components inside the casing, they must be cut out from the casing, thereby requiring additional finishing steps and increasing the production cost.
On the other hand, the process of cutting out the projections from the molded casing is generally done by a manual operation. It is necessary for workers to pay careful attention during the cutting operation in order to avoid excessive or deep cuts which will render the molded casing to become thin at the cut parts, or insufficient cuts which will leave uneven surfaces on the molded casing.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a gas-assisted injection molding method for fabricating a casing having tubular screw posts which facilitates fabrication and reduces the manufacturing time thereof.
According to this invention, a method for fabricating a casing having tubular screw posts comprises injection molding a resin composition in a mold to form the casing by introducing a pressurized gas into the resin composition through gas supplying pins to form hollow parts in the resin composition, providing the gas supplying pins with an outer diameter conforming to an inner diameter of the tubular screw posts, positioning the gas supplying pins in a mold at preset locations where the tubular posts must be formed, forming bores in the preset locations by removing the gas supplying pins from the preset locations before the resin composition is hardened, and providing internal screw members in the bores.
REFERENCES:
patent: 4474717 (1984-10-01), Hendry
patent: 5948445 (1999-09-01), Filipp
McDowell Suzanne E
Quanta Computer Inc.
Renner , Otto, Boisselle & Sklar, LLP
Tentoni Leo B.
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