US3690797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection moulding machines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1970-02-02
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Granted: 1972-09-12
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Expires: 1990-02-02
Abstract
Abstract Providing a valve in a ''''two-shot'''' injection moulding machine which consists of a shuttle which can slide across the paths of polymer flow to block one while allowing polymer to flow along the other, the position of the shuttle being controlled by the relative pressures in the two polymer streams.
Inventors
- 👤 Paul Johnson Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1603; B29C45/1604; B29C45/1642; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
266 words
An injection moulding machine for moulding two different synthetic resinous materials into a laminar article comprising two separate sources from which the two synthetic resinous materials are introduced into a mould along a common sprue, a valve means for controlling the flow of said material from said two separate sources, said valve means comprising separate bores communicating with said sources and converging into a single bore communicating with said common sprue, a shuttle having a length greater than the width of the individual separate bores and being disposed in a channel connecting said bores, said channel being located between said sources and the convergence of said bores into a single bore, said shuttle having a close fit in said channel and a portion of the upper surface of the shuttle nearest the said sources being suitably tapered so that the forces exerted on the upper surface of the shuttle by the material in one bore act to urge the shuttle into the other bore and slidably movable from a first position wherein the bore communicating with the first source is closed and the bore communicating with the second source is open, to a second position wherein the bore communicating with the second source is closed and the bore communicating with the first sources is open, the position of the shuttle being determined by the relative forces exerted on the shuttle by the materials in the sources immediately preceding the shuttle and a shut-off tap located between the said channel and the sprue which can be switched to prevent material from entering the sprue from either source.
Claim 2
Dependent Claim
266 words
An injection moulding machine for moulding two different synthetic resinous materials into a laminar article comprising two separate sources from which the two synthetic resinous materials are introduced into a mould along a common sprue, a valve means for controlling the flow of said material from said two separate sources, said valve means comprising separate bores communicating with said sources and converging into a single bore communicating with said common sprue, a shuttle having a length greater than the width of the individual separate bores and being disposed in a channel connecting said bores, said channel being located between said sources and the convergence of said bores into a single bore, said shuttle having a close fit in said channel and a portion of the upper surface of the shuttle nearest the said sources being suitably tapered so that the forces exerted on the upper surface of the shuttle by the material in one bore act to urge the shuttle into the other bore and slidably movable from a first position wherein the bore communicating with the first source is closed and the bore communicating with the second source is open, to a second position wherein the bore communicating with the second source is closed and the bore communicating with the first sources is open, the position of the shuttle being determined by the relative forces exerted on the shuttle by the materials in the sources immediately preceding the shuttle and a shut-off tap located between the said channel and the sprue which can be switched to prevent material from entering the sprue from either source.
Claim 3
Dependent Claim
16 words
An injection moulding machine adapted to moulding two different synthetic resins into a laminar article, comprising:
Claim 4
Dependent Claim
16 words
An injection moulding machine adapted to moulding two different synthetic resins into a laminar article, comprising:
Claim 5
Dependent Claim
18 words
a first resin injection means for generating a pressure on and injecting a first resin into said mould;
Claim 6
Dependent Claim
18 words
a first resin injection means for generating a pressure on and injecting a first resin into said mould;
Claim 7
Dependent Claim
19 words
a second resin injection means for generating a pressure on and injecting a second different resin into said mould;
Claim 8
Dependent Claim
19 words
a second resin injection means for generating a pressure on and injecting a second different resin into said mould;
Claim 9
Dependent Claim
52 words
An injection moulding machine according to claim 1 in which the valve is formed in a single block of metal provided with two substantially parallel bores along which the two materials flow, respectively, and the shuttle is mounted in a channel joining the two bores in a direction transverse to their axes.
Claim 10
Dependent Claim
27 words
An injection moulding machine according to claim 1 in which the two separate sources are injection barrels both of which may introduce material into the single sprue.
Claim 11
Dependent Claim
32 words
a valve means disposed between said first and second resin injecting means and said mould for controlling the flow of resin injected from said first and second injecting means to said mould;
Claim 12
Dependent Claim
32 words
a valve means disposed between said first and second resin injecting means and said mould for controlling the flow of resin injected from said first and second injecting means to said mould;
Claim 13
Dependent Claim
16 words
first channel means for communicating from said first resin injecting means and through said valve means;
Claim 14
Dependent Claim
16 words
first channel means for communicating from said first resin injecting means and through said valve means;
Claim 15
Dependent Claim
33 words
An injection moulding machine according to claim 1 in which the paths of materials converge in a tap beyond the valve which may be switched to prevent any material from entering the sprue.
Claim 16
Dependent Claim
23 words
An injection moulding machine according to claim 1 in which the valve is formed in the barrel end cap of the moulding machine.
Claim 17
Dependent Claim
16 words
second channel means for communicating from said second resin injecting means and through said valve means;
Claim 18
Dependent Claim
16 words
second channel means for communicating from said second resin injecting means and through said valve means;
Claim 19
Dependent Claim
26 words
sprue means for communicating between said mould and said valve means and connecting with said first and second channel means at a point of convergence thereof;
Claim 20
Dependent Claim
26 words
sprue means for communicating between said mould and said valve means and connecting with said first and second channel means at a point of convergence thereof;
Claim 21
Dependent Claim
31 words
a tap means disposed between and communicating with said valve means and said point of convergence of said channels for completely cutting off the flow of resins to said mould; and
Claim 22
Dependent Claim
31 words
a tap means disposed between and communicating with said valve means and said point of convergence of said channels for completely cutting off the flow of resins to said mould; and
Claim 23
Dependent Claim
146 words
said valve means having a pressure responsive means for operating said valve means to communicate the first injection means or said Second injection means with said mould, said pressure responsive means being operable only in response to the pressures in said first and second injection means immediately preceding the said valve means and said valve means having a shuttle with a portion of the upper surface thereof nearest the said channel means being suitably tapered so that the forces exerted on the upper surface by the resin acts to urge the shuttle so that the shuttle operates from a first position in communication with said first injection means to a second position in communication with said second injection means and through an intermediate position in communication with both said first and second injection means, whereby a substantially constant flow of resin to said mould is maintained.
Claim 24
Dependent Claim
146 words
said valve means having a pressure responsive means for operating said valve means to communicate the first injection means or said Second injection means with said mould, said pressure responsive means being operable only in response to the pressures in said first and second injection means immediately preceding the said valve means and said valve means having a shuttle with a portion of the upper surface thereof nearest the said channel means being suitably tapered so that the forces exerted on the upper surface by the resin acts to urge the shuttle so that the shuttle operates from a first position in communication with said first injection means to a second position in communication with said second injection means and through an intermediate position in communication with both said first and second injection means, whereby a substantially constant flow of resin to said mould is maintained.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |