US4238182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for injecting plastics material into a mould having a plurality of impressions
Assignee: Individual
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Filing: 1978-07-24
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Granted: 1980-12-09
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Expires: 1998-07-24
Abstract
Abstract This device injects plastics material into a mould having a plurality of impressions. It comprises a distribution plate pierced with channels for the inlet of the plastics material to be injected and provided with heating means and an impression plate comprising a plurality of impression inserts into which the plastics material is to be injected. Injection nozzles are disposed between the distribution plate and the various impression inserts, each presenting an injection orifice opening into the impression insert associated therewith and being obturated by an obturator needle mounted to slide axially in the nozzle. The connection between the distribution plate and each nozzle is ensured by a material transfer tube engaged in two cavities made respectively in the distribution plate and the nozzle, opposite each other, the first communicating with a channel for the inlet of the plastics material and the second with the injection orifice of the nozzle, this transfer tube being in tight contact with the lateral walls of the two cavities via two respective spherical sectors provided on its side surface.
Inventors
- 👤 Gilbert Mollier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:54
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/28; B29C45/2806; Y; Y10; Y10S; Y10S425/00; Y10S425/229
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
304 words
A device for injecting plastics material in a mould having a plurality of impressions, comprising: a distribution plate pierced with channels for the inlet of the plastics material to be injected and provided with heating means; an impression plate comprising a plurality of impression inserts into which the plastics material is to be injected; injection nozzles disposed between said distribution plate and the various impression inserts and being free of any connection with said distribution plate, each presenting an injection orifice opening into the impression insert associated therewith and being obturated by an obturator needle mounted to slide axially in the nozzle; a material transfer tube ensuring the connection between the distribution plate and each nozzle and engaged in two cavities made respectively in the distribution plate and in the nozzle, opposite each other, the first communicating with a channel for the inlet of the plastics material from said distribution plate and the second with the injection orifice of the nozzle, this transfer tube being in tight contact with the lateral walls of the two cavities via two respective spherical sectors provided on its side surface to perform a sealing function even when said distribution plate and said nozzles are relatively displaced; and said obturator needle projects into a coaxial housing provided in the distribution plate, it terminates in a head of larger diameter and is upwardly extended by a coaxial rod terminating, at its lower end, in a head of larger diameter disposed in the housing, said obturator needle and said rod being in contact with each other via their respective heads of different diameters and being assembled together by a ring crimped on the head of large diameter, leaving a minimum axial clearance for the head of smaller diameter but allowing it the radial, rotary or planetary displacements necessary for its alignment.
Claim 2
Independent Claim
304 words
A device for injecting plastics material in a mould having a plurality of impressions, comprising: a distribution plate pierced with channels for the inlet of the plastics material to be injected and provided with heating means; an impression plate comprising a plurality of impression inserts into which the plastics material is to be injected; injection nozzles disposed between said distribution plate and the various impression inserts and being free of any connection with said distribution plate, each presenting an injection orifice opening into the impression insert associated therewith and being obturated by an obturator needle mounted to slide axially in the nozzle; a material transfer tube ensuring the connection between the distribution plate and each nozzle and engaged in two cavities made respectively in the distribution plate and in the nozzle, opposite each other, the first communicating with a channel for the inlet of the plastics material from said distribution plate and the second with the injection orifice of the nozzle, this transfer tube being in tight contact with the lateral walls of the two cavities via two respective spherical sectors provided on its side surface to perform a sealing function even when said distribution plate and said nozzles are relatively displaced; and said obturator needle projects into a coaxial housing provided in the distribution plate, it terminates in a head of larger diameter and is upwardly extended by a coaxial rod terminating, at its lower end, in a head of larger diameter disposed in the housing, said obturator needle and said rod being in contact with each other via their respective heads of different diameters and being assembled together by a ring crimped on the head of large diameter, leaving a minimum axial clearance for the head of smaller diameter but allowing it the radial, rotary or planetary displacements necessary for its alignment.
Claim 3
Dependent Claim
69 words
An injection device according to claim 1, wherein the head of the rod of the obturator assembly has a larger diameter than that of the head of the obturator needle and the ring, crimped on the head of large diameter of the rod, terminates, in its lower part, in a flange defining a central orifice of a sufficiently large diameter to allow a radial movement of the obturator needle.
Claim 4
Dependent Claim
59 words
An injection device according to claim 1 or 2, wherein the rod of the obturator assembly is mounted to slide axially in a bore of a ring screwed in the distribution plate, this bore communicating, via conduits made in the ring, with a conduit pierced in the distribution plate and serving to evacuate the residual leakages of plastics material.
Claim 5
Dependent Claim
52 words
An injection device according to claim 1, including a peripheral outer frame, and wherein the space between said distribution plate on the one hand and said upper plate, said lower impression plate, and said peripheral frame serving to tighten all these elements, on the other hand, is filled with a heat insulator.
Claim 6
Dependent Claim
14 words
An injection device according to claim 4, wherein said heat insulator is glass wool.
Claim 7
Dependent Claim
60 words
An injection device according to claim 1 or 2, wherein the rod of the obturator assembly opens out, at its upper end, in a housing made in the upper plate and receiving the device for returning the obturator assembly, with jack means, the rod being in contact under a plug made of a material which is a poor heat conductor.
Claim 8
Dependent Claim
78 words
An injection device according to claim 1 or 2, wherein the distribution plate is wedged in space by means of shims made of a titanium alloy material which is a poor heat conductor, one of these rings being disposed between each nozzle and an impression insert of the impression plate, whilst the other ring is disposed between the distribution plate and the upper plate at the location of each obturator assembly, surrounding the upper part of said latter.
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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |