Apparatus for pneumatically placing semi-fluid materials

Claim 2

Apparatus for spraying a continous stream of wet semi-fluid material capable of setting to a hard end product against a work surface comprising: a spray nozzle, a positive pump metering and pumping semi-fluid material to a discharge outlet thereof, means for suspending the semi-fluid material delivered to the discharge outlet in a gaseous medium and delivering it from the discharge outlet to the spray nozzle, said means including a conduit connected between the discharge outlet of the pump and the spray nozzle, and means impinging a compressed gas at an angle to the stream of semi-fluid material metered from the discharge outlet into the conduit at a pressure sufficient to shear discrete pieces of the semi-fluid material extruded into the gaseous stream by the pump and convey them in the suspended gas stream to the spray nozzle.

Claim 3

Apparatus for spraying a continuous Stream of wet semi-fluid material capable of setting to a hard end product against a work surface comprising: a spray nozzle, a rotary pump for metering the semi-fluid material to a discharge outlet, the rotary pump including a stationary ring, a compressible hose having circumferentially placed inlet and outlet ports therein extending about and bearing against the interior surface of the stationary ring, and a power driven rotor compressing the hose and producing a fluid pocket of material moving about the circumference of the ring progressively from the inlet port for extrusion of the semi-fluid material through the outlet port, and means for suspending the semi-fluid material delivered to the discharge port by the pump in a gaseous medium and delivering it to the spray nozzle, said means including a conduit connected between the discharge port of the pump and the spray nozzle, and means impinging a compressed gas at an angle to the stream of semi-fluid material extruded into the conduit by the pump at a pressure sufficient to shear discrete pieces of the semi-fluid material and convey them suspended in the gaseous stream to the spray nozzle.

Claim 4

Apparatus for spraying a continuous Stream of wet semi-fluid material capable of setting to a hard end product against a work surface comprising: a spray nozzle, a rotary pump for metering the semi-fluid material to a discharge outlet, the rotary pump including a stationary ring, a compressible hose having circumferentially placed inlet and outlet ports therein extending about and bearing against the interior surface of the stationary ring, and a power driven rotor compressing the hose and producing a fluid pocket of material moving about the circumference of the ring progressively from the inlet port for extrusion of the semi-fluid material through the outlet port, and means for suspending the semi-fluid material delivered to the discharge port by the pump in a gaseous medium and delivering it to the spray nozzle, said means including a conduit connected between the discharge port of the pump and the spray nozzle, and means impinging a compressed gas at an angle to the stream of semi-fluid material extruded into the conduit by the pump at a pressure sufficient to shear discrete pieces of the semi-fluid material and convey them suspended in the gaseous stream to the spray nozzle.

Claim 5

The apparatus of claim 2 wherein the means for suspending the semi-fluid material includes a T-section with the base of the ''''T'''' connected to the discharge port of the pump, with the conduit connected to one side of the top of the ''''T'''', and wherein the compressed gas is delivered through the other side of the top of the ''''T'''' for impingement at substantially right angles to the semi-fluid material extruded into the T-section by the pump at a pressure sufficient to suspend discrete pieces of the semifluid material and convey them to the spray nozzle through the conduit.

Claim 6

Apparatus for spraying a continuous stream of a wet semi-fluid material capable of setting to a hard end product against a work surface comprising: a spray nozzle, a positive pump metering and pumping the semi-fluid material to the discharge outlet of the pump, means for suspending the semi-fluid material delivered to the discharge outlet of the pump in a gaseous medium and delivering it to the spraying nozzle, said means including a conduit connecting the discharge outlet of the pump and the spray nozzle, and a means intersecting the conduit impinging a compressed gas at an angle to the stream of semi-fluid material extruded into the gas stream by the pump at a pressure sufficient to shear discrete pieces of the semi-fluid material and convey them suspended in the gaseous stream to the spray nozzle, metering means for metering a dry, particulate quick-set additive for the semi-fluid material in a predetermined weight ratio of additive to semi-fluid material, a second conduit connecting the discharge outlet of the metering means intersecting the conduit carrying the stream of gas-suspended semi-fluid material before ejection of the semi-fluid material from the nozzle, and means supplying compressed gas to suspend and convey the particulate additive into contact with the gas-suspended semi-fluid material.

Claim 7

Apparatus for spraying a continuous stream of a wet semi-fluid material capable of setting to a hard end product against a work surface comprising: a spray nozzle, a positive pump metering and pumping the semi-fluid material to the discharge outlet of the pump, means for suspending the semi-fluid material delivered to the discharge outlet of the pump in a gaseous medium and delivering it to the spraying nozzle, said means including a conduit connecting the discharge outlet of the pump and the spray nozzle, and a means intersecting the conduit impinging a compressed gas at an angle to the stream of semi-fluid material extruded into the gas stream by the pump at a pressure sufficient to shear discrete pieces of the semi-fluid material and convey them suspended in the gaseous stream to the spray nozzle, metering means for metering a dry, particulate quick-set additive for the semi-fluid material in a predetermined weight ratio of additive to semi-fluid material, a second conduit connecting the discharge outlet of the metering means intersecting the conduit carrying the stream of gas-suspended semi-fluid material before ejection of the semi-fluid material from the nozzle, and means supplying compressed gas to suspend and convey the particulate additive into contact with the gas-suspended semi-fluid material.

Claim 8

The apparatus of claim 2 wherein the semi-fluid material is a cementitious material.

Claim 9

The apparatus of claim 4 wherein the metering means includes a holding vessel for the additive, agitator means within the vessel, and feed means in communication within the vessel for feeding predetermined amounts of additive into the second conduit.

Claim 10

The apparatus of claim 6 wherein the pump and metering means are directly connected for delivery of a predetermined weight ratio of semi-fluid material to quick-setting additive.