Molds for production of plastics material boats

Details Molds for production of plastics material boats Molds for production of plastics material boats

1976-06-21

1978-10-17

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

4254519, 425DIG238, B29C 100

Patent

active

041206320

ABSTRACT:
Molds for the production of fiber reinforced plastics material boat hulls filled with hard foam plastics material are constructed of plastics material and reinforced against deformation by rigid cores and tension bands to accurately shape the hulls even when subjected to high stresses during molding and foam filling. The molds have separable top and bottom halves connected around their peripheries by interfitting flanges forming a seal and also provided with ventilating channels. The outer shell of the bottom mold half between the flanges has a free catenary curve configuration supporting the reinforcing cores for the molding surface or inner shell of the mold.

REFERENCES:
patent: 2916909 (1959-12-01), Miller
patent: 3059738 (1962-10-01), Lutz
patent: 3124626 (1964-03-01), Graham et al.

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