Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – And means to apply stress to preform and uniting in stressed...
Patent
1974-11-27
1976-12-28
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
And means to apply stress to preform and uniting in stressed...
249 18, 249 81, 249126, 249147, B28B 2306
Patent
active
039999130
ABSTRACT:
A lower longitudinal carriage has a stressing portal at one end and an anchor portal at its other end. The vertical members of the portals have vertical slots to allow longitudinal stressing bars to pass through at any place along the vertical height. An upper longitudinal carriage is spaced above the lower carriage and in turn supports tiers of rectangular mold forms in which the lowest form rests upon a rigid support and each successive mold form rests upon the hardened slab which has been cast in the mold form below it, separated by a durable plastic sheet.
Longitudinal stressing rods run through the portals and the mold forms at any height appropriate for the forms. Stressing rods running transversely to the longitudinal rods, run through vertical slots in vertical members in end bents and one or more side bents which slide between the stressing portal and the anchor portal and in the space between the upper and lower carriages.
A universal prestressed concrete slab is produced by the apparatus, comprising a thin web surrounded by a rectangular frame like flange. Knock-out pins in the mold form position a cavity-forming wooden form or pan in the mold form.
REFERENCES:
patent: 1592070 (1926-07-01), Blake
patent: 2971237 (1961-02-01), Graham
patent: 3161938 (1964-12-01), Graham
patent: 3182948 (1965-05-01), Lawrence
patent: 3491417 (1970-01-01), Haller et al.
patent: 3767153 (1973-10-01), Haller et al.
Lazarus Richard B.
McQuade John
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