Mixing apparatus

Claim 1

In a machine for the production of foams or homogeneous materials from liquid reaction components comprising feed lines equipped with pumps leading to a mixing head, said mixing head having a housing, a control unit and a mixing chamber with an outlet opening enclosed by the housing, the control unit comprising lift slides formed with injection openings which are connected to the feed lines in the working position, said lift slides being fixed to a common yoke equipped with a control drive, said lift slides being disposed in guide bores separated from one another by a land and a junction plane extending through the mixing chamber, the improvement which comprises lift slides adapted to be withdrawn into the guide bores while in the rest position with their injection openings disposed in said guide bores and adapted to be introduced into a mixing chamber in their working position to such an extent that at least a portion of one injection opening in each lift slide is disposed in the mixing chamber for injection of fluid therein.

Claim 7

An apparatus for mixing liquids together comprising a two-piece housing, a cavity in a first of the said pieces of the housing forming a mixing chamber, a pair of guide bores extending longitudinally through a second of said pieces, means for attaching the two pieces together with the cavity communicating with the guide bores, a lift member having a bore therein with a closed end disposed slidably in each guide bore with the closed end adjacent the cavity, an opening in the wall of each lift slide adjacent the said closed end for flow of liquid from the bore of the lift slide, a yoke attached to those ends of the lift slides opposite the closed ends, means for moving the yoke longitudinally in the guide bores from a position where the said openiNgs are in the cavity to a withdrawn position where the openings are within the guide bores, a partitioning member disposed between the lift slides and blocking said opening when the lift slides are in the withdrawn position, a pair of longitudinally spaced ports through the second piece of the housing into each of the guide bores, a first of said spaced ports of each pair being connected to a source of liquid for flow of liquid towards the bore of the lift slide and the second port of each pair being connected to the said source for recirculation of the liquid, a pair of ports in each lift slide spaced longitudinally from each other whereby the first of each pair of lift slide ports communicates with a first housing port when the lift slides are in the rest or working position and the second of each pair communicates with the second housing port when the lift slide is in the rest position but is moved out of said communication with the lift slides are in the working position.

Claim 8

An apparatus for mixing liquids together comprising a two-piece housing, a cavity in a first of the said pieces of the housing forming a mixing chamber, a pair of guide bores extending longitudinally through a second of said pieces, means for attaching the two pieces together with the cavity communicating with the guide bores, a lift member having a bore therein with a closed end disposed slidably in each guide bore with the closed end adjacent the cavity, an opening in the wall of each lift slide adjacent the said closed end for flow of liquid from the bore of the lift slide, a yoke attached to those ends of the lift slides opposite the closed ends, means for moving the yoke longitudinally in the guide bores from a position where the said openiNgs are in the cavity to a withdrawn position where the openings are within the guide bores, a partitioning member disposed between the lift slides and blocking said opening when the lift slides are in the withdrawn position, a pair of longitudinally spaced ports through the second piece of the housing into each of the guide bores, a first of said spaced ports of each pair being connected to a source of liquid for flow of liquid towards the bore of the lift slide and the second port of each pair being connected to the said source for recirculation of the liquid, a pair of ports in each lift slide spaced longitudinally from each other whereby the first of each pair of lift slide ports communicates with a first housing port when the lift slides are in the rest or working position and the second of each pair communicates with the second housing port when the lift slide is in the rest position but is moved out of said communication with the lift slides are in the working position.