US4285660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle for a plastics injection molding machine, an extruder orifice, or a hot-chamber tool
Assignee: EWIKON ENTWICKLUNG und KONSTRUKTION GmbH and Co KG
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Filing: 1979-05-22
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Granted: 1981-08-25
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Expires: 1999-05-22
Abstract
Abstract A nozzle for use in injection molding machines and the like is disclosed which heats the plastic melt maximally in the region of the injection zone. This is accomplished by a unique heating element which has a large surface area in this region. The nozzle is so designed as to create a suitable temperature gradient by interaction between cooperating flanges around the injection orifice and the element.
Inventors
- 👤 Walter Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:03
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/30; B29C48/00; B29C48/25; B29C48/78; B29C48/86; B29C48/865; B29C48/03
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
103 words
A nozzle for use in plastic injection moulding machines, extruder orifices, hot chamber tools and the like, comprising: a hollow forwardly elongated body with an interior bounded by an interior surface, a forward end in which at least one orifice is located, the orifice communicating with the interior of the body; and a single unitary elongated resistance heating element located within the interior and having an enlarged pointed head adjacent to and projecting in part out of said at least one orifice, the head being so shaped as to have a maximal surface area with the point adjacent said at least one orifice.
Claim 2
Dependent Claim
103 words
A nozzle for use in plastic injection moulding machines, extruder orifices, hot chamber tools and the like, comprising: a hollow forwardly elongated body with an interior bounded by an interior surface, a forward end in which at least one orifice is located, the orifice communicating with the interior of the body; and a single unitary elongated resistance heating element located within the interior and having an enlarged pointed head adjacent to and projecting in part out of said at least one orifice, the head being so shaped as to have a maximal surface area with the point adjacent said at least one orifice.
Claim 3
Dependent Claim
21 words
The nozzle defined by claim 1, wherein the body further includes a part located in a rear end of the body.
Claim 4
Dependent Claim
26 words
The nozzle defined by claim 1, wherein the body further includes a part located intermediate the forward end of the body and a rear end thereof.
Claim 5
Dependent Claim
17 words
The nozzle defined by claim 1, wherein the body has two orifices located at its forward end.
Claim 6
Dependent Claim
18 words
The nozzle defined by claim 1, wherein the head is lance-shaped at a forward end of the element.
Claim 7
Dependent Claim
13 words
The nozzle defined by claim 5, wherein the element and head are unitary.
Claim 8
Dependent Claim
19 words
The nozzle defined by claim 5, wherein the element and head are of separate pieces which are joined together.
Claim 9
Dependent Claim
20 words
The nozzle defined by claim 6, wherein the element has a circular cross-section all along its length above the head.
Claim 10
Dependent Claim
13 words
The nozzle defined by claim 8, wherein the head has two transverse blades.
Claim 11
Dependent Claim
13 words
The nozzle defined by claim 9, wherein the head has a rectangular cross-section.
Claim 12
Dependent Claim
14 words
The nozzle defined by claim 10, wherein the blades extend out of the orifices.
Claim 13
Dependent Claim
13 words
The nozzle defined by claim 8, wherein the head has a cruciform cross-section.
Claim 14
Dependent Claim
13 words
The nozzle defined by claim 8, wherein the head has a stellate cross-section.
Claim 15
Dependent Claim
18 words
The nozzle defined by claim 7, wherein at least some of the pieces are made of plate material.
Claim 16
Dependent Claim
43 words
The nozzle defined by claim 1, wherein a ratio in which an area of an exterior surface of the element is the numerator and in which an area of the interior surface of the body is the denominator, is between 1:1.5 and 1:3.5.
Claim 17
Dependent Claim
11 words
The nozzle defined by claim 15, wherein the ratio is 1:2.5.
Claim 18
Dependent Claim
33 words
The nozzle defined by claim 1, wherein said at least one orifice is formed by flanges which are connected to each other and are integral with at least a portion of the body.
Claim 19
Dependent Claim
18 words
The nozzle defined by claim 17, wherein there are two orifices and the flanges are triangular in shape.
Claim 20
Dependent Claim
19 words
The nozzle defined by claim 17, wherein the flanges are all connected to the forwardmost end of the head.
Claim 21
Dependent Claim
22 words
The nozzle defined by claim 1, wherein the body is electrically conductive and is at least partly in series with the element.
Claim 22
Dependent Claim
34 words
The nozzle defined by claim 20, wherein the body is in two parts which are electrically insulated from each other and which are each electrically connected to a corresponding end of the heating element.
Claim 23
Dependent Claim
24 words
The nozzle defined by claim 21, wherein one of said parts is shaped so as to be deformable under thermal expansion of the element.
Claim 24
Dependent Claim
15 words
The nozzle defined by claim 22, wherein said one part is shaped into a diaphragm.
Claim 25
Dependent Claim
17 words
The nozzle defined by claim 22, wherein said one part is formed of a cylindrical helical spring.
Claim 26
Dependent Claim
14 words
The nozzle defined by claim 22, wherein said one part is provided with slots.
Claim 27
Dependent Claim
17 words
The nozzle defined by claim 25, wherein the slots are oriented longitudinally with respect to the body.
Claim 28
Dependent Claim
17 words
The nozzle defined by claim 25, wherein the slots are oriented transversely with respect to the body.
Claim 29
Dependent Claim
19 words
The nozzle defined by claim 27, wherein said one part is located at the rear end of the body.
Claim 30
Dependent Claim
19 words
The nozzle defined by claim 27, wherein said one part is located at the front end of the body.
Claim 31
Dependent Claim
14 words
The nozzle defined by claim 21, wherein one of said parts is electrically grounded.
Claim 32
Dependent Claim
19 words
The nozzle defined by claim 21, further including insulation so located that the body is electrically insulated from ground.
Claim 33
Dependent Claim
16 words
The nozzle defined by claim 21, wherein the insulation is accomplished by discs of aluminum-oxide ceramic.
References Cited (Backward Citations)
US2462308A
Cited
US2724146A
Cited
US3010155A
Cited
US3719310A
Cited
US3945535A
Cited
DE2403510A1
Cited
FR2274430A1
Cited
DE2542162A1
Cited
US4125352A
Cited
US4161386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |