Mixing machine with symmetrically-guided presser rod actuator

A mixer comprising:

• a housing forming a mixing chamber provided with a mixing assembly for mixing a mixture of materials fed from above into said mixing chamber;
• a feed structure extending upwardly from said mixing chamber for introducing said materials into said chamber, said housing and said feed structure having a vertical axis, said feed structure having a cover;
• a pair of vertical guides disposed symmetrically on opposite sides of said vertical axis and affixed to said feed structure;
• a respective cylinder affixed to each of said guides above said cover and having a respective piston rod extending out of a lower end of the respective cylinder;
• a cross-member extending transversely to said axis above said cover and affixed at opposite ends to said piston rods below said cylinders for raising and lowering of said cross-member by said cylinders;
• respective rolling means on each of said ends of said cross-member riding vertically on said guides;
• a rod hinged by a ball joint at an upper end of said rod to said cross-member and extending downwardly therefrom through said cover into said feed structure;
• a sealing assembly horizontally movable on said cover and vertically guiding said rod;
• and
• a presser member on a lower end of said rod adapted to extend into said chamber to apply pressure to the mixture therein, said presser member being retractable on said rod to enable said materials to be introduced into said chamber.

A mixer comprising:

• a housing forming a mixing chamber provided with a mixing assembly for mixing a mixture of materials fed from above into said mixing chamber;
• a feed structure extending upwardly from said mixing chamber for introducing said materials into said chamber, said housing and said feed structure having a vertical axis, said feed structure having a cover;
• a pair of vertical guides disposed symmetrically on opposite sides of said vertical axis and affixed to said feed structure;
• a respective cylinder affixed to each of said guides above said cover and having a respective piston rod extending out of a lower end of the respective cylinder;
• a cross-member extending transversely to said axis above said cover and affixed at opposite ends to said piston rods below said cylinders for raising and lowering of said cross-member by said cylinders;
• respective rolling means on each of said ends of said cross-member riding vertically on said guides, each of said rolling means including:
• a respective pair of flanges at the respective end of said cross-member, and
• a plurality of wheels rotatable between the respective pair of flanges;
• a rod hinged at an upper end of said rod to said cross-member and extending downwardly therefrom through said cover into said feed structure;
• a sealing assembly horizontally movable on said cover and vertically guiding said rod;
• and
• a presser member on a lower end of said rod adapted to extend into said chamber to apply pressure to the mixture therein, said presser member being retractable on said rod to enable said materials to be introduced into said chamber.