Abstract An apparatus for pumping liquid concrete having a hollow housing with an inlet means for receiving the liquid concrete. Passageway means run through the housing and exit at a discharge. The inlet means and passageway means merge within the housing. Piston means are connected to one side of the passageway. A pair of blades is disposed along outside faces of the housing. One of the blades is placed so as to intermittently close the inlet means. The other blade is disposed at the discharge and intermittently closes it. Reciprocating means oscillate the blades in co-action with the movement of the piston means so that as the piston means moves from the housing, the blade disposed at the inlet means rotates permitting the liquid concrete to enter the housing. Simultaneously, the other blade rotates so as to close the discharge preventing pumped concrete from being impelled towards the housing. As the reciprocating means urges the piston towards the housing, the blade at the inlet means closes it preventing the liquid concrete from being pushed into the inlet means while the other blade opens the discharge permitting the concrete to exit the housing.
An apparatus for pumping liquid concrete comprising: a housing having a pair of spaced-apart passageways exiting at a common discharge at one end thereof, a pair of inlet ducts each merging with one of said passageways at an oblique angle within said housing, and a concrete receiving hopper coupled to said inlet ducts; a pair of cylinders each connected to said pair of spaced-apart passageways at the other end of said housing; a piston disposed in each of said cylinders; a reciprocating shaft angularly disposed through said housing and having a pair of blades, diametrically opposed and disposed at an oblique angle about one end of said shaft so that one blade intermittently closes one inlet duct and the other blade intermittently closes one passageway adjacent to the common discharge, means for axially adjusting said shaft with respect to the inlet ducts and the passageways, said reciprocating shaft co-acting with each of said pistons so that one of the blades opens one of the inlet ducts to permit liquid concrete to enter the housing as its corresponding piston is withdrawn in one of the cylinders while the other blade opens the other passageway adjacent to the common discharge while its corresponding piston is urged towards the housing permitting the liquid concrete to exit from the passageway into the common discharge.
Claim 2
Independent Claim
220 words
An apparatus for pumping liquid concrete comprising: a housing having a pair of spaced-apart passageways exiting at a common discharge at one end thereof, a pair of inlet ducts each merging with one of said passageways at an oblique angle within said housing, and a concrete receiving hopper coupled to said inlet ducts; a pair of cylinders each connected to said pair of spaced-apart passageways at the other end of said housing; a piston disposed in each of said cylinders; a reciprocating shaft angularly disposed through said housing and having a pair of blades, diametrically opposed and disposed at an oblique angle about one end of said shaft so that one blade intermittently closes one inlet duct and the other blade intermittently closes one passageway adjacent to the common discharge, means for axially adjusting said shaft with respect to the inlet ducts and the passageways, said reciprocating shaft co-acting with each of said pistons so that one of the blades opens one of the inlet ducts to permit liquid concrete to enter the housing as its corresponding piston is withdrawn in one of the cylinders while the other blade opens the other passageway adjacent to the common discharge while its corresponding piston is urged towards the housing permitting the liquid concrete to exit from the passageway into the common discharge.
Claim 3
Dependent Claim
46 words
The apparatus as recited in claim 1 wherein said inlet ducts and the passageways adjacent tO the common discharge include flanges, for sliding and sealing contact with said blades and said means for axially adjusting said shaft urges said blades in sealing contact with said flanges.