Simultaneously molded threaded port and plug
First Claim
1. The method of simultaneously molding a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port, which comprises:
- defining first cavity means for receiving molding compound to form said wall, and second cavity means for receiving molding compound to form said threaded plug;
inserting rotatable shaft means carrying external threads through said first cavity to define the threaded port, said shaft means terminating at the second cavity means;
placing molding compound into said first and second cavity means for molding the wall and plug;
forming a separable mechanical linkage between said end portion and plug molded in the second cavity means;
rotating said shaft after hardening of the molding compound to withdraw it from the newly molded, threaded port and to rotate the molded, threaded plug into said threaded port for sealing thereof.
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Accused Products
Abstract
A simultaneously molded threaded port and plug may be produced by a mold which comprises a first cavity for receiving molding compound to form a wall, a second cavity for receiving molding compound to form the threaded plug, and rotatable shaft means carrying external thread forming grooves and extending through the first cavity to define the threaded port. The shaft means terminates at the second cavity, with an end portion of the shaft being shaped to form a separable mechanical linkage between the end portion and the plug molded in the second cavity means. The shaft is rotated after molding to withdraw it from the molded, threaded port, and to rotate the molded, threaded plug into the threaded port for sealing thereof.
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Citations
19 Claims
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1. The method of simultaneously molding a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port, which comprises:
defining first cavity means for receiving molding compound to form said wall, and second cavity means for receiving molding compound to form said threaded plug;
inserting rotatable shaft means carrying external threads through said first cavity to define the threaded port, said shaft means terminating at the second cavity means;
placing molding compound into said first and second cavity means for molding the wall and plug;
forming a separable mechanical linkage between said end portion and plug molded in the second cavity means;
rotating said shaft after hardening of the molding compound to withdraw it from the newly molded, threaded port and to rotate the molded, threaded plug into said threaded port for sealing thereof.- View Dependent Claims (2, 3, 4, 5)
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6. In a mold adapted to simultaneously mold a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port,
first cavity means for receiving molding compound to form said wall; - second cavity means for receiving molding compound to form said threaded plug;
rotatable shaft means carrying a helical, external thread-forming groove and extending through said first cavity to define the threaded port, said shaft means terminating at said second cavity means with an end portion being shaped to form a separable, mechanical linkage between said end portion and a plug molded in the second cavity means, and means for rotating said shaft after molding to withdraw it from the molded, threaded port and to rotate the molded, threaded plug into said threaded port for sealing thereof, and a freely rotatable wall-forming member defining the side of said second cavity means which is opposed to said shaft means, said rotatable wall-forming member defining projections to create in the molded plug means to facilitate removal thereof from the threaded port.
- second cavity means for receiving molding compound to form said threaded plug;
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7. In a mold adapted to simultaneously mold a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port,
first cavity means for receiving molding compound to form said wall; - second cavity means for receiving molding compound to form said threaded plug;
rotatable shaft means carrying a first helical, external thread-forming groove and extending through said first cavity means to define the threaded port, said shaft means terminating at said second cavity means with an end portion being shaped to form a separable mechanical linkage between said end portion and a plug molded in the second cavity means, and means for rotating said shaft means after molding to withdraw it from the molded, threaded port and to rotate the molded, threaded plug into the threaded port for sealing thereof, said second cavity means defining a second helical thread-forming groove, the portion of thread-forming groove of said second thread-forming groove which is remotest from said shaft means being of a different pitch from the remaining thread-forming groove portion, to mold a thread in said plug which serves as a retaining lock of said plug in the threaded port.
- second cavity means for receiving molding compound to form said threaded plug;
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8. In a mold adapted to simultaneously mold a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port,
first cavity means for receiving molding compound to form said wall; -
second cavity means for receiving molding compound to form said threaded plug; rotatable shaft means carrying a helical external thread-forming groove and extending through said first cavity to define the threaded port, said shaft means terminating at said second cavity means with an end portion being shaped to form a separable mechanical linkage between said end portion and a threaded plug molded in the second cavity means, and means for rotating said shaft after molding to withdraw it from the molded, threaded port and to rotate the molded, threaded plug into said threaded port for sealing thereof. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. In a mold adapted to simultaneously mold a threaded port in a wall and a separate, threaded plug adapted for sealing said threaded port,
first cavity means for receiving molding compound to form said wall; - second cavity means for receiving molding compound to form said threaded plug;
gate means between said first and second cavity means permitting flow of a molding compound therebetween;
rotatable shaft means carrying a helical external thread-forming groove and extending through said first cavity to define the threaded port, said shaft means terminating at said second cavity means with an end portion being shaped to form a separable mechanical linkage between said end portion and a plug molded in the second cavity means, and means for rotating said shaft after molding to withdraw it from the molded, threaded port and to rotate the molded, threaded plug into said threaded port for sealing thereof, while severing hardened molding compound in said gate means upon said rotation; and
a freely rotatable wall-forming member defining the side of said second cavity means which is opposed to said shaft means, said rotatable wall-forming member defining projections to create in the molded plug means to facilitate removal thereof from the threaded port, in which said second cavity means defines a helical thread-forming groove, the remotest thread-forming groove portion from said shaft means extending at least 360°
about said second cavity means and being of essentially equal depth to the thread-forming groove of the port-defining portion of the shaft means, the remainder of said thread forming groove in said second cavity means being of slightly less depth. - View Dependent Claims (17, 18, 19)
- second cavity means for receiving molding compound to form said threaded plug;
Specification