Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
In an integral electrically heated sprue bushing having a hollow elongated inner core portion with a runner passage extending centrally therethrough, an electrical heating element with a helical portion encircling the inner core portion and a lead portion having an enlarged end portion, the lead portion extending out through an aperture in the sprue bushing which is considerably larger than the heating element lead portion, a highly conductive elongated portion around the helical portion of the heating element, and an elongated outer sleeve portion over the conductive portion, the improvement further comprising: (a) the aperture having seat means therein, (b) first split washer means with a central opening through which the heating element lead portion extends formed by fitting a first plurality of split washer portions in the seat means in the aperture around the heating element lead portion thereby substantially closing the space therearound, (c) second split washer means similar to the first split washer means formed adjacent thereto by fitting a second plurality of split washer portions in the seat means in the aperture around the heating element lead portion, and (d) a hollow elongated connector sleeve rigidly fixed to the sprue bushing with one end received in the aperture adjacent the second split washer means, with the heating element lead portion extending therein for connection to external lead wires.
Claim 2
Dependent Claim
222 words
In an integral electrically heated sprue bushing having a hollow elongated inner core portion with a runner passage extending centrally therethrough, an electrical heating element with a helical portion encircling the inner core portion and a lead portion having an enlarged end portion, the lead portion extending out through an aperture in the sprue bushing which is considerably larger than the heating element lead portion, a highly conductive elongated portion around the helical portion of the heating element, and an elongated outer sleeve portion over the conductive portion, the improvement further comprising: (a) the aperture having seat means therein, (b) first split washer means with a central opening through which the heating element lead portion extends formed by fitting a first plurality of split washer portions in the seat means in the aperture around the heating element lead portion thereby substantially closing the space therearound, (c) second split washer means similar to the first split washer means formed adjacent thereto by fitting a second plurality of split washer portions in the seat means in the aperture around the heating element lead portion, and (d) a hollow elongated connector sleeve rigidly fixed to the sprue bushing with one end received in the aperture adjacent the second split washer means, with the heating element lead portion extending therein for connection to external lead wires.
Claim 3
Dependent Claim
32 words
An improvement as claimed in claim 1 wherein the first and second split washer means and the connector sleeve are vacuum brazed in position to become integral parts of the sprue bushing.
Claim 4
Dependent Claim
39 words
An improvement as claimed in claim 2 wherein the first and second split washer means each comprise a pair of half washers with divisions therebetween, the washer means being oriented in abutting relationship with the divisions not in alignment.
Claim 5
Dependent Claim
25 words
An improvement as claimed in claim 3 wherein the connector sleeve has a flared portion extending to the said one end received in the aperture.