Mold structure

• US 4,561,625 A
• Filed: 12/23/1983
• Issued: 12/31/1985
• Est. Priority Date: 09/26/1983
• Status: Expired due to Term

• Current Assignee: LOF Glass Incorporated (Nippon Sheet Glass Company Limited)
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Inventors: Weaver, William R.
• Primary Examiner(s): Hoag, Willard E.
• Application Number:
  US06/564,721
• Time in Patent Office: 739 Days
• Field of Search: 264/252, 249/83, 249/96, 249/95, 249/97, 249/65, 249/85, 425/117, 425/127, 425/116, 425/341, 425/110, 425/340
• US Class Current: 249/85
• CPC Class Codes: B29C 33/0044 for sealing off parts of inserts projecting into the mould cavity
• CPC Class Codes: B29C 45/14434 Coating brittle material, e.g. glass B29C45/14377, B29C45/14418 take precedence
• CPC Class Codes: B29C 70/763 the edges being disposed in a substantial flat plane
• CPC Class Codes: B60J 10/265 the surface being primarily decorative
• CPC Class Codes: B60J 10/30 characterised by the fastening means
• CPC Class Codes: B60J 10/70 specially adapted for windows or windscreens
• CPC Class Codes: Y10S 264/83 Injection molding of polyolefin-type foam

Abstract

The present invention relates to a mold structure for forming a polymeric gasket around a predetermined portion of a sheet of transparent material such as glass, for example. The mold structure includes two cooperating mold sections for defining a chamber for receiving the transparent sheet. A seal is positioned about the periphery of the chamber and is utilized to resiliently support the sheet within the chamber. Also, the seal cooperates with a predetermined portion of the transparent sheet for defining a gasket cavity having a configuration corresponding to the gasket to be formed on the sheet of transparent material. An inlet communicates with the gasket cavity and is utilized to introduce a flowable gasket material into the gasket cavity.

Claims

1. A mold structure for forming a gasket on a predetermined portion of a frangible sheet comprising:

at least two cooperating mold sections having facing surfaces defining a chamber for receiving the sheet;

seal means positioned in said mold sections adjacent the periphery of the sheet to resiliently support the sheet within the sheet receiving chamber and in spaced relationship with portions of the mold facing surfaces located interiorly of said seal means;

at least one of the facing surfaces of said mold sections located outwardly of the said seal means provided with a gasket shaping portion which cooperates with said seal means and the predetermined portion of the sheet to define a gasket forming cavity corresponding to the gasket to be formed on the sheet;

at least a portion of the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity adapted to contact one another, said mold sections being constructed of a rigid material such that the contact between the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity limits the amount said seal means are compressed whereby the dimensions of the gasket forming cavity can be precisely controlled when said mold sections are in contacting relationship, said facing surfaces located inwardly of the contacting portions thereof delimiting said sheet receiving chamber; and

inlet means for introducing a flowable gasket forming material into the gasket forming cavity when said mold sections are in contacting relationship.

2. The mold structure according to claim 1 wherein at least one of said mold sections includes a groove formed therein for receiving said seal means, and means for maintaining said seal means within said groove.

3. A mold structure for forming a gasket about the peripheral portion of a frangible sheet of transparent material comprising:

a pair of cooperating mold sections having facing surfaces defining a chamber for receiving the sheet;

seal means positioned in the facing surfaces of each of said mold sections adjacent to and coextensive with the periphery of the sheet to resiliently support the sheet within the sheet receiving chamber and in spaced relationship with the portion of the mold facing surfaces located interiorly of said seal means;

at least one of the facing surfaces of said mold sections located exteriorly of said seal means provided with a gasket forming portion which cooperates with said seal means and the predetermined portion of the sheet to define a gasket forming cavity corresponding to the gasket to be formed on the sheet;

at least a portion of the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity adapted to contact one another, said mold sections being constructed of a rigid material such that the contact between the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity limits the amount said seal means are compressed whereby the dimensions of the gasket forming cavity can be precisely controlled when said mold sections are in contacting relationship, said facing surfaces located inwardly of the contacting portions thereof delimiting said sheet receiving chamber; and

inlet means for introducing a flowable gasket forming material into the gasket forming cavity when said mold sections are in contacting relationship.

4. The mold structure according to claim 3 wherein said mold sections include an upper mold section adapted for movement toward and away from a lower mold section, said lower mold section including means for maintaining the sheet on said lower mold section when said upper mold section is moved away from said lower mold section.

5. A mold structure for forming a gasket on a predetermined portion of a frangible sheet comprising:

a pair of cooperating mold sections having facing surfaces defining a chamber for receiving the sheet;

seal means positioned in the facing surfaces of each of said mold sections adjacent the periphery of the sheet to resiliently support the sheet within the sheet receiving chamber and in spaced relationship with the portions of the mold facing surfaces located interiorly of said seal means;

each of the facing surfaces of said mold sections provided with a separate gasket forming portion which cooperates with said seal means and the predetermined portion of the sheet to define a gasket forming cavity corresponding to the gasket to be formed on the sheet;

at least a portion of the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity adapted to contact one another, said mold sections being constructed of a rigid material such that contact between the facing surfaces of said mold sections disposed outwardly of the gasket forming cavity limits the amount said seal means are compressed to space said separate gasket forming portions apart a predetermined distance when said mold sections are in contacting relationship, said facing surfaces located inwardly of the contacting portions thereof delimiting said sheet receiving chamber; and

inlet means for introducing a flowable gasket forming material into the gasket forming cavity when said mold sections are in contacting relationship.