Abstract: Apparatus for producing various construct materials and comprises a vertical container converging from the top down and a vibrator. The container has pipes for feeding a suspension thereinto and discharging a thickened suspension, respectively, and filtering side walls for the passage of filtrate. The vibrator is mounted outside the container and has vibration transmitting planes extending substantially along the filtering side walls of the container in such a manner that they cooperate, during operation of the vibrator, with the filtering side walls to impart vibrations thereto. This facilitates continuous dehydration of the suspension without formation of cake on the filtering surface, whereby a high degree of filtration and a greater filtering rate are ensured.

Abstract: A sifting machine having vibration generators connected to the opposite ends of a sieve screen, the vibration generators being so constructed as to vibrate one end of the sieve screen at a relatively low frequency and a relatively high amplitude and to vibrate the other end of the sieve screen at a relatively high frequency and a relatively low amplitude.