# US 4,396,562 A · Method of producing a hollow monobloc body by using a blowing process

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- Number: US 4,396,562 A
- Document ID: US4396562A
- Status: Granted
- Kind: A
- Application number: 06/196,050
- Filed: 1980-03-28
- Granted: 1983-08-02
- Earliest claimed: 1978-07-28
- Assignees: Creaplast
- Inventors: Jean Heaume
- Web page: https://patentgrep.com/patent/US4396562A

## CPC

- B60K 15/03177: {made of non-metallic material, e.g. plastics, or of a combination of non-metallic and metallic material (B60K15/03006 takes precedence)}
- B29C 49/20: of articles having inserts or reinforcements {; Handling of inserts or reinforcements}
- B29C 2049/2008: {inside the article}
- B29L 2031/7172: {Fuel tanks, jerry cans}
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- 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)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A method of producing a hollow monobloc body in a mold which includes the steps of separating the shells of the mold from each other, interposing an element attached to a support between the shells, forming a parison between the shells and around the element, bringing the shells together to enclose the parison and the element, and producing by blowing a hollow monobloc body having an orifice therein which surrounds the element and has its interior wall spaced therefrom. The body is removed from the mold and a device inserted through an orifice in the body for welding the element to the interior wall of the body. The element is then welded to this interior wall.

## Claims

### Claim 1

The method of producing a hollow monobloc body in a mold comprising a pair of separable shells, said method including the steps of:
separating the shells of said mold from each other;
interposing an element between said shells, said element being positioned by a support attached thereto;
forming a parison between said shells and around said element;
bringing said shells together to enclose said parison and said element;
producing by blowing a hollow monobloc body having an orifice therein, said body surrounding said element and having its interior wall spaced therefrom, said element being maintained at a distance from walls of said parision before and during said blowing;
removing said body from said mold;
freeing said element from said support; and
welding said element to the interior wall of said body using an electrode or sonotrode inserted through the orifice in said body.

### Claim 2 (depends on 1)

The method defined by claim 1 wherein said support comprises a rod having one end attached to said element, and wherein the other end thereof comprises an insert composed of a thermoplastic material which is compatible with the thermoplastic material of said body, said insert adhering to the wall of said body by intermolecular cohesion to form a continuous block with said body prior to the step of removing said parison from said mold.

### Claim 3 (depends on 2)

The method defined by claim 2 wherein said insert is heated to provide adherence to the wall of said body.