Concrete molding apparatus

Details Concrete molding apparatus Concrete molding apparatus

1978-03-27

1981-01-06

Derrington, James H.

Static molds

Including means to apply force to remove or release product...

249161, 264336, 425139, 425441, 425444, B28B 712

Patent

active

042431980

ABSTRACT:
An improved molding machine which overcomes the tendency of concrete members molded therein to become end distorted upon initial discharge movement relative to the mold cavities in which they are formed. The front set of plates which close that end of the multi-cavity mold box proximal to the discharge end of the machine are maintained in contact with the faces of the concrete member adjacent thereto at least during the initial breakaway of the concrete members from the sides of the mold. The molded members are forced out of the mold box by a hydraulic ram acting upon a second set of end plates which act to close the rear end of the mold cavities. Once the concrete members are smoothly moving relative to the mold cavities, the front set of end plates are withdrawn to enable the members to be completely discharged from the mold. A bleed orifice is placed in the return line of the hydraulic cylinder controlling the retraction action of the front end plates so that the two sets of end plates move in unison.

REFERENCES:
patent: 2663063 (1953-12-01), Van Loon
patent: 3577509 (1971-05-01), Hicquet et al.
patent: 3824059 (1974-07-01), Heltzel
patent: 3989432 (1976-11-01), Depka

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