Patent Application
20060022384
1. Field of the Invention
A tubular spout of a connector for an automotive cooling system.
2. Description of the Prior Art
Such connectors are frequently used to house thermostats and include a spout for receiving a hose for fluid flow. The spout has an inner diameter C for defining a fluid passageway in the spout and an outer diameter B for defining the exterior surface of the spout and a nipple ridge extending annularly about the spout. A hose is forced over the niple ridge and clamped to the exterior surface of the spout. The conector is formed of a plastic material and the mold elements defining the cavity in which the spout is formed define a parting line or rib extending radialy outwardly of the exterior surface of the spout and this partingline in the molded spout can cause leakage between the exterior surface of the spout and the hose clamped to that exterior surface.
The invention provides a spout devoid of such a parting line by extending an insert annularly completely about a cavity to present the inner diameter C devoid of a parting line for forming the exterior surface of the spout devoid of a parting line. The anular insert presents an undercut having a ridge diameter A larger than the inner diameter C and extending completely about the cavity to define the nipple ridge extending radially outwardly from the exterior surface of the spout. The insert moved over the nipple ridge by flexing the nipple ridge into the smaller inner diameter C of the insert.
Other advantages of the present invention will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
Referring to the Figures, wherein like numerals indicate corresponding elements throughout the several views, a connector 20 is shown generally for an automotive cooling system. The connector 20 includes a flange 22 having bolt holes for connection to a support, such as an automotive engine. The connector 20 also includes a tubular spout 24 extending from the flange 22 to a distal end 26 and defining a passageway 28 extending from an opening in the distal end 26 of the spout 24 for fluid to flow therethough. As illustrated, the connector 20 includes two such spouts 24, one large spout 24 for housing a thermostat and a smaller spout 24 for fluid flow.
As illustrated in
The connector 20 of the subject invention is characterized by the exterior surface of the spout 24 being devoid of such a parting line on the opposite side of the nipple ridge 30 from the distal end 26 with the nipple ridge extending radially outwardly from the exterior surface and extending completely about the exterior surface, whereby a hose disposed over the nipple ridge can be held in tight sealing engagement with a smooth exterior surface of the spout 24 completely about the spout 24 to diminish the possibility of leakage.
Although other shapes may be employed, in the embodiment illustrated, the cross section of the nipple ridge 30 includes a straight top 32 extending between ends and parallel to the exterior surface and diverging straight sides 34 extending from opposite ends of the top to the exterior surface.
The subject invention includes a method of molding the tubular spout 24 of the connector 20 for an automotive cooling system. As illustrated in
In accordance with the method, the plastic material is injected into the cavity for forming the spout 24 and after the plastic material solidifies sufficiently, the insert 38 is pulled over the nipple ridge 30 by flexing the nipple ridge 30 into the smaller inner diameter C of the insert 38. A mating mold part 40 extends into the insert 38 to define the outer straight side 34 of the nipple ridge and when removed leaves the annular insert 38 open but with the outer diameter B inside or smaller than the ridge diameter A. Accordingly, the ridge diameter A must flex radially inwardly in order for the insert 38 to be removed from the spout 24.
In order to facilitate the separation of the annular insert 38 from the spout 24, the method includes maintaining an undercut ratio of the ridge diameter A minus the outer diameter B divided by the inner diameter C less than 0.08 or eight percent. Undercut ratio X=[A−B]/C x≦8%.
In order to facilitate the flexing of nipple ridge radially inwardly for removal from the insert 38, the interior mold part 36 presents the cavity with a conically shaped taper 42 extending into the inner diameter C and under the undercut defining the nipple ridge 30. The taper 42 is preferred but not required in all applications. The taper 42 can increase the undercut ratio up to fifteen percent to around nine percent.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings. The invention may be practiced otherwise than as specifically described within the scope of the appended claims, wherein that which is prior art is antecedent to the novelty set forth in the “characterized by” clause. The novelty is meant to be particularly and distinctly recited in the “characterized by” clause whereas the antecedent recitations merely set forth the old and well-known combination in which the invention resides. These antecedent recitations should be interpreted to cover any combination in which the incentive novelty exercises its utility. In addition, the reference numerals in the claims are merely for convenience and are not to be read in any way as limiting.
This application claims the benefit of application Ser. No. 60/591,684 filed Jul. 28, 2004.
| Number | Date | Country | |
|---|---|---|---|
| 60591684 | Jul 2004 | US |
