Patent US4430769A successfully refreshed from Google Patents.
Patent US4579520A successfully refreshed from Google Patents.
US4579520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding valve gated system
Assignee: Individual
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Filing: 1984-03-02
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Granted: 1986-04-01
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Expires: 2004-03-02
Abstract
Abstract This invention relates to an improved valve gated injection molding system in which the heated nozzle has a nose portion which extends through a cylindrical opening in the cavity plate to the cavity. The valve gate extends through the nose portion and is tapered so that the forward face of the nose portion can be machined to a predetermined length to provide a gate of a particular size. This has the advantage of improving heat transfer to the gate area and reducing the accuracy required of the moldmaker in that both the valve pin and the matching seat in the gate are provided by the manufacturer. Furthermore, each size of nozzle can be adapted for several different gate sizes which reduces manufacturing and inventory costs.
Inventors
- 👤 Jobst U. Gellert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:01
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/28; B29C45/2806; B29C2045/2848; Y; Y10; Y10S; Y10S425/00; Y10S425/227
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
401 words
In a heated nozzle to be seated in a cooled cavity plate in a valve gated injection molding system wherein an elongated valve pin reciprocates in the heated nozzle between open and closed positions, a melt passage extends through a bore in the heated nozzle around the valve pin and conveys hot pressurized melt from a molding machine to a gate leading to a cavity, where said cavity is partially defined on one side by a face of the cavity plate, the valve pin has a driven end and a tip end which seats in the gate in the closed position, and a valve pin actuating mechanism engaging the driven end of the valve pin to drive said valve pin between the open and closed positions, the heated nozzle having a hollow nose portion which defines the gate extending therethrough from the bore to a forward face, the nose portion having a cylindrical outer surface and being tightly seated in a longitudinal position in a cylindrical opening through the cavity plate to the cavity, the nose portion extending through the cylindrical opening to a position wherein at operating temperature the forward face of the nose portion is in substantial alignment with said face of the cavity plate to define said one side of the cavity, the improvement wherein: (a) the nose portion is manufactured with the nose portion of the heated nozzle sufficiently longer than the length of the opening through the cavity plate and at least a portion of the gate extending through the nose portion is tapered to decrease in diameter away from the bore, (b) the valve pin is manufactured with the tip end being tapered to match the tapered portion of the gate, and (c) means are provided to seat the nozzle in the cavity plate whereby the longitudinal position of the nose portion of the nozzle can be adjusted to have the forward face of the nose portion in substantial alignment with said face of the cavity plate, whereby a gate having a particular larger diameter can be selected prior to assembly of the system by machining off predetermined forward portions of the nose portion of the nozzle and the matching tapered tip end of the valve pin, and adjusting the seating means to longitudinally locate the nozzle with the forward face of the nose portion in substantial alignment with said face of the cavity plate.
Claim 2
Dependent Claim
401 words
In a heated nozzle to be seated in a cooled cavity plate in a valve gated injection molding system wherein an elongated valve pin reciprocates in the heated nozzle between open and closed positions, a melt passage extends through a bore in the heated nozzle around the valve pin and conveys hot pressurized melt from a molding machine to a gate leading to a cavity, where said cavity is partially defined on one side by a face of the cavity plate, the valve pin has a driven end and a tip end which seats in the gate in the closed position, and a valve pin actuating mechanism engaging the driven end of the valve pin to drive said valve pin between the open and closed positions, the heated nozzle having a hollow nose portion which defines the gate extending therethrough from the bore to a forward face, the nose portion having a cylindrical outer surface and being tightly seated in a longitudinal position in a cylindrical opening through the cavity plate to the cavity, the nose portion extending through the cylindrical opening to a position wherein at operating temperature the forward face of the nose portion is in substantial alignment with said face of the cavity plate to define said one side of the cavity, the improvement wherein: (a) the nose portion is manufactured with the nose portion of the heated nozzle sufficiently longer than the length of the opening through the cavity plate and at least a portion of the gate extending through the nose portion is tapered to decrease in diameter away from the bore, (b) the valve pin is manufactured with the tip end being tapered to match the tapered portion of the gate, and (c) means are provided to seat the nozzle in the cavity plate whereby the longitudinal position of the nose portion of the nozzle can be adjusted to have the forward face of the nose portion in substantial alignment with said face of the cavity plate, whereby a gate having a particular larger diameter can be selected prior to assembly of the system by machining off predetermined forward portions of the nose portion of the nozzle and the matching tapered tip end of the valve pin, and adjusting the seating means to longitudinally locate the nozzle with the forward face of the nose portion in substantial alignment with said face of the cavity plate.
Claim 3
Dependent Claim
60 words
A heated nozzle as claimed in claim 1 wherein the nose portion of the heated nozzle is shaped to be inserted into the opening through the cavity plate when cool, whereby thermal expansion of the nose portion as the nozzle is heated tightly engages the nose portion in the cavity plate and prevents leadkage of the pressurized melt between them.
Claim 4
Dependent Claim
33 words
A heated nozzle as claimed in claim 2 wherein the nose portion of the heated nozzle and the opening through the cavity plate in which the nose portion is seated are cylindrical shaped.
Claim 5
Dependent Claim
43 words
A heated nozzle as claimed in claim 2 wherein the nose portion of the heated nozzle has a cylindrical shaped head portion which extends into the opening through the cavity plate to the forward face from a neck portion having a reduced diameter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |