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US 7,179,072 B2Granted
Gas venting needle
OwnerGordon Frederick Smith, David George Head +1inventors
InventorsGordon Frederick Smith, David George Head, Helmut Echardt
Life of this patent
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Abstract
A gas venting needle for use in gas injection moulding the open end having a flow valve with no moving parts; the flow valve being provided by a plurality of individual flow channels sized such that in use gas may freely flow through these channels but liquid moulding material may not freely flow through.
Claims9
A needle for use in gas injection moulding comprising:
- a plurality of individual flow channels with open ends providing a flow valve with no required moving parts;
- the flow channels configured such that in use gas may freely flow through the flow channels but liquid moulding material may not freely flow therethrough;
- wherein the plurality of individual flow channels are provided by a strip of material spirally wound;
- wherein spacer elements are provided between adjacent turns of the spirally wound material.
1 more element
Dependencies are inferred from the claim text.