# US 8,465,820 B2 · Method and plant for the production of a casing for a solid-propellant engine, and casing made according to said method

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- Number: US 8,465,820 B2
- Document ID: US8465820B2
- Status: Granted
- Kind: B2
- Application number: 13/287,241
- Filed: 2011-11-02
- Published: 2012-02-23
- Granted: 2013-06-18
- Earliest claimed: 2007-06-13
- Assignees: AVIO S.p.A.
- Applicants: Giuseppe Magistrale
- Inventors: Giuseppe Magistrale
- Web page: https://patentgrep.com/patent/US8465820B2

## CPC

- B29C 45/02: Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
- B29C 45/1671: {with an insert}
- F02K 9/343: {Joints, connections, seals therefor}
- F02K 9/346: {Liners, e.g. inhibitors}
- B29K 2019/00: Use of rubber not provided for in a single one of main groups {B29K2007/00 - B29K2011/00,} as moulding material
- B29K 2021/00: Use of unspecified rubbers as moulding material
- Y10T 428/1386: Natural or synthetic rubber or rubber-like compound containing
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A casing of a solid-propellant engine comprising a core and a layer of elastomeric material, set as coating for at least part of the core to provide a thermal protection of the core itself is obtained by: inserting the core in a forming mold so as to make within the mold two annular chambers separated from one another by the core; forming a strand of elastomeric material; obtaining a defined portion of elastomeric material by cutting the strand transversely to size in an external environment; and injecting the cut portion of elastomeric material simultaneously within both of the annular chambers.

## Claims

### Claim 1

A casing for a solid-propellant engine, the casing comprising an inner surface,
an outer surface,
a core between the inner and outer surfaces, and having a threaded cylindrical terminal portion at one end,
a layer of thermally insulating elastomeric material coated directly on the entirety of the surfaces of said core including on the side of the core facing the inner surface and the side of the core facing the outer surface of the casing but not on said terminal portion.

### Claim 2 (depends on 1)

The casing of claim 1 wherein the thread of said threaded extension comprises an external thread.

### Claim 3 (depends on 2)

The casing of claim 2 wherein the elastomeric material is co-molded on said core.