Abstract: There is disclosed a method and apparatus for making tubular fiber reinforced thermosetting resin elements having a thermoplastic lining. The technique involves application of a thermoplastic lining layer to an axially moving mandrel surface, application of at least one layer of fiber reinforced thermosetting resin material superimposed upon the lining layer, providing for bonding of thermosetting and thermoplastic layers to each other, and heating the thermosetting resin to effect solidification during axial advancement of the superimposed layers with the moving mandrel surface. Provision is also made for applying a thermoplastic jacket layer superimposed upon the thermosetting layer.
Type:
Grant
Filed:
June 21, 1976
Date of Patent:
March 28, 1978
Assignee:
Frede Hilmar Drostholm
Inventors:
Frede Hilmar Drostholm, Leonard S. Meyer
Abstract: A brick press is disclosed having a turntable carrying a plurality of molds angularly spaced from each other and having equipment associated therewith establishing a plurality of series of operating stations, each series including at least a precompression station, a compression station and an ejection station. The molds carried by the turntable are provided with replaceable liners. A material handling and feed system is also disclosed, providing for preparation of particulate or granular materials to be charged into the molds.
Type:
Grant
Filed:
September 9, 1976
Date of Patent:
September 27, 1977
Assignee:
Frede Hilmar Drostholm
Inventors:
Frede Hilmar Drostholm, Harry Jensen, Per Willadsen
Abstract: Production of high strength structural building components by steam curing a compressed mixture of laterite, lime and water at a temperature preferably between 70.degree. and 100.degree. C.
Type:
Grant
Filed:
March 6, 1975
Date of Patent:
September 13, 1977
Assignee:
Frede Hilmar Drostholm
Inventors:
Torben Christen Hansen, Thomas Ringsholt
Abstract: A brick press is disclosed having a turntable carrying a plurality of molds angularly spaced from each other and having equipment associated therewith establishing a plurality of series of operating stations, each series including at least a precompression station, a compression station and an ejection station. A material handling and feed system is also disclosed, providing for preparation of particulate or granular materials to be charged into the molds.
Type:
Grant
Filed:
September 30, 1974
Date of Patent:
July 12, 1977
Assignee:
Frede Hilmar Drostholm
Inventors:
Frede Hilmar Drostholm, Harry Jensen, Per Willadsen
Abstract: Equipment is provided having a distillation tank with a heater and a vapor offtake, with a condenser receiving the offtake vapor and delivering liquid condensate. A control system provides safety features including pressure and temperature responsive devices operative to shut off the heater and further including means for shut off of the heater when the tank is being filled. Still further provision is made for shutting off the heater under the influence of a float valve associated with the condensate discharge line and operative to shut off the heater under the influence of rise in level of condensate in the receiving vessel.
Type:
Grant
Filed:
June 24, 1975
Date of Patent:
May 10, 1977
Assignee:
Frede Hilmar Drostholm
Inventors:
Frede Hilmar Drostholm, Kaj Ditlev Frederik Petersen, Ulf Raabo
Abstract: There is disclosed a method and apparatus for making tubular fiber reinforced thermosetting resin elements having a thermoplastic lining. The technique involves application of a thermoplastic lining layer to an axially moving mandrel surface, application of at least one layer of fiber reinforced thermosetting resin material superimposed upon the lining layer, providing for bonding of thermosetting and thermoplastic layers to each other, and heating the thermosetting resin to effect solidification during axial advancement of the superimposed layers with the moving mandrel surface. Provision is also made for applying a thermoplastic jacket layer superimposed upon the thermosetting layer.
Type:
Grant
Filed:
March 22, 1972
Date of Patent:
March 8, 1977
Assignee:
Frede Hilmar Drostholm
Inventors:
Frede Hilmar Drostholm, Leonard S. Meyer