Patent ID: 6419127
Filing Date: 2002-07-16
Classification: E01C

Abstract:
An apparatus for supplying material under a raised curb and gutter comprising a portable mud pump and a material mixing tank, said portable pump comprising:an air cylinder, a pump body, the air cylinder and pump body being interconnected end-to-end, a dual piston assembly having a first piston reciprocally mounted in the air cylinder and a second piston reciprocally mounted in the pump body, an air supply, A reversing valve assembly for controlling said air supply to opposite ends of the air cylinder for producing an intake stroke and a pumping stroke of the dual piston assembly, said reversing valve assembly including a reversible electric motor, a one way check valve located intermediate the pump body and said material mixing tank, and said pump body having a discharge section through which material from said mixing tank is pumped into a cavity under a raised curb and gutter section.