MOLDING DEVICE AND METHOD FOR MOLDING A NUT INTO A COVER

• US 20120168994A1
• Filed: 08/11/2011
• Published: 07/05/2012
• Est. Priority Date: 12/29/2010
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: DAI, JIAN-HUI, TANG, CHAO, SHU, JIE-YI, LUO, ZHONG-JIE, CHEN, YU-TAO, JAN, TE-SHENG, YEN, CHUN-CHE
• Application Number:
  US13/207,432
• Publication Number:
  US 20120168994A1
• Time in Patent Office: Days
• US Class Current: 264/571
• CPC Class Codes: B29C 2045/14155 using vacuum or suction
• CPC Class Codes: B29C 45/14065 Positioning or centering articles in the mould
• CPC Class Codes: B29L 2001/005 Nuts
• CPC Class Codes: F16B 37/122 Threaded inserts, e.g. "rampa bolts"
• CPC Class Codes: F16B 37/14 Cap nuts; Nut caps or bolt caps

Abstract

A method for molding a nut into a cover of an electronic device is provided. The nut includes a chassis defining a threaded blind hole therein. The method includes the following steps: providing a core mold, the core mold including a molding surface and a recess defined in the molding surface; placing the nut on the core mold with the chassis fittingly engaged in the recess; creating a negative pressure within the recess to firmly secure the chassis in the recess; attaching a cavity mold to the core mold, the cavity mold and the core mold cooperatively forming a molding cavity receiving the nut therein; and injecting molding material into the molding cavity to form the cover with the nut embedded therein. A molding device for molding the nut into the cover is also provided.

Claims

1. A method for molding a nut into a cover of an electronic device, the nut comprising a chassis defining a threaded blind hole therein, the method comprising:

providing a core mold, the core mold including a molding surface and a recess defined in the molding surface;

placing the nut on the core mold with the chassis fittingly engaged in the recess;

creating a negative pressure within the recess to firmly secure the chassis in the recess;

attaching a cavity mold to the core mold, the cavity mold and the core mold cooperatively forming a molding cavity receiving the nut therein; and

injecting molding material into the molding cavity to form the cover with the nut embedded therein.

2. The method as described in claim 1, wherein the core mold comprises a post formed on a bottom of the recess, and the post is inserted into the blind hole.

3. The method as described in claim 1, wherein the core mold includes a plurality of holes defined in the molding surface in the recess, the holes is configured for connection to a vacuum pump to create the negative pressure.

4. A molding device for molding a nut into a cover, the molding device comprising:

a cavity mold; and

a core mold, the core mold and the cavity mold cooperatively defining a molding cavity, the core molding including a molding surface in the molding cavity, a recess defined in the molding surface, and at least one suction hole defined in a bottom of the recess, the core mold including a post protruding from the bottom of the recess and protruding beyond the molding surface.

5. The molding device as described in claim 4, wherein the at least one suction hole comprises a plurality of holes, and the holes are arranged along a plurality of imaginary circles.

6. The molding device as described in claim 5, wherein the imaginary circles are concentric.