Mandrel for manufacturing fiber reinforced resin vessel

Patent metadata

Field	Value
Publication number	US-11230048-B2
Application number	US-202016747722-A
Country	US
Kind code	B2
Filing date	Jan 21, 2020
Priority date	Jan 21, 2019
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

A mandrel for manufacturing a fiber reinforced resin vessel by a filament winding process includes: a tubular part; and a pair of end parts joined to respective axial ends of the tubular part. The tubular part and the end parts are each made of a molded product of a material including pulp and a starch-based binder.

First claim

The invention claimed is:

1. A mandrel for manufacturing a fiber reinforced resin vessel by a filament winding process, comprising:
a tubular part; and
a pair of end parts joined to respective axial ends of the tubular part;
wherein the tubular part and the end parts are each made of a molded product of a material including pulp and a starch-based binder, and
the tubular part includes a cylindrical outer peripheral wall having a central axial line, a planar partition wall extending radially inward and orthogonally to the central axial line from a first end of the outer peripheral wall, and a plurality of bulging parts bulging from the partition wall toward a second end of the outer peripheral wall, each bulging part being connected to an inner circumferential surface of the outer peripheral wall.

2. The mandrel according to claim 1 , wherein a recess is defined jointly by a back surface of each bulging part and an opposing part of the inner circumferential surface of the outer peripheral wall.

3. The mandrel according to claim 1 , wherein a free end of each bulging part includes an end wall extending in parallel with the partition wall and connected to the outer peripheral wall.

4. The mandrel according to claim 1 , wherein each bulging part includes a pair of side walls extending radially with respect to the central axial line.

5. The mandrel according to claim 1 , wherein a shaft hole is passed through the end parts and the tubular part in a coaxial relationship to receive a shaft that supports the end parts and the tubular part.

6. The mandrel according to claim 5 , wherein a part of an outer surface of each end part surrounding the shaft hole is formed with a receiving recess configured to receive a fitting for the vessel.

7. The mandrel according to claim 6 , wherein the receiving recess is provided with a plurality of radial extensions configured to receive complementary radial projections of the fitting.

8. The mandrel according to claim 5 , wherein each end part is provided with a plurality of reinforcing ribs extending radially from a peripheral part of the shaft hole along an inner surface of the end part.

9. The mandrel according to claim 1 , wherein the tubular part includes a plurality of individual tubular part sections that are joined to one another in a coaxial relationship, and each tubular part section is provided with a plurality of locking projections projecting axially from the partition wall beyond a corresponding axial edge of the tubular part section, each locking projection having an outwardly facing surface configured to contact an inner peripheral surface of the adjoining tubular part section or the adjoining end part.

10. The mandrel according to claim 1 , wherein the tubular part includes a plurality of individual tubular part sections that are joined to one another in a coaxial relationship, and each tubular part section is provided with a plurality of projecting pieces projecting from an axial end thereof beyond a corresponding axial edge thereof, each projecting piece having an outwardly facing surface configured to contact an inner peripheral surface of the adjoining tubular part section or the adjoining end part.

11. The mandrel according to claim 1 , wherein the tubular part and the end parts consist of individual molded products formed by injection molding.

Assignees

• Honda Motor Co Ltd
• Daiho Ind Co Ltd

Inventors

• Totsuka Masanori
• Fujiki Koei
• Noji Yohei
• Shinnabe Yoshikazu
• Matsuzaka Keisuke

Classifications

• B29C53/822 Primary

  Single use mandrels, e.g. destructible, becoming part of the wound articles (B29C53/825 takes precedence) · CPC title

• B29C70/54

  Component parts, details or accessories; Auxiliary operations {, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing} · CPC title

• B29C53/602

  for tubular articles having closed or nearly closed ends, e.g. vessels, tanks, containers · CPC title

• B29L2031/7156

  Pressure vessels · CPC title

• B29C53/825 Primary

  for continuous winding · CPC title