Method of making a safety helmet

Details Method of making a safety helmet Method of making a safety helmet

1995-09-19

1996-10-15

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264338, B29C 4406, B29C 4412, B29C 4414

Patent

active

055651550

ABSTRACT:
A method of making a safety helmet includes using a molding tool having an upper mold cavity and a lower mold cavity. The upper mold cavity is preheated and is then coated with a layer of releasing agent. The releasing agent layer is coated subsequently with a layer of polyurethane lacquer, which is caused by the residual heat of the preheated upper mold cavity to form a smooth film layer. A plastic shell of the safety helmet is disposed in the lower mold cavity. A foam material is injected into the plastic shell before the molding tool is closed. As the foaming process is completed, the molding tool is opened to remove therefrom a safety helmet including the shell, the foam layer formed of the foam material, and the smooth film layer which is formed integrally with the foam layer for providing the user of the safety helmet with wearing comfort.

REFERENCES:
patent: 2908943 (1959-10-01), Miller
patent: 3935044 (1976-01-01), Daly
patent: 3950483 (1976-04-01), Spier
patent: 4288268 (1981-09-01), Hartung
patent: 4298556 (1981-11-01), Rutsch et al.
patent: 4473208 (1984-09-01), Nava
patent: 5298208 (1994-03-01), Sibley et al.
patent: 5324460 (1994-06-01), Briggs

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