Back to results
US 4,789,244 AGranted
Apparatus and method to produce foam, and foamed concrete
AssigneeStandard Concrete Materials, Inc.
InventorsHarvey R. Dunton, Donald H. Rez
Life of this patent
Estimating the term…
Abstract
A method for forming foam, useful in mixing with concrete at a batching plant, includes the steps: (a) supplying a synthetic resinous foaming agent, in liquid form, (b) combining the foaming agent with water, to form a liquid mix, and pressurizing the mix, (c) adding pressurized gas to the mix, (d) sub-dividing the mix into droplets, in a confined flowing stream, (e) reducing the stream confinement, (f) whereby the droplets expand as foam, typically consisting of individual, gas filled bubbles.
Claims8
A foam producing system, comprising:
- (a) first and second means to supply a foaming agent and water, respectively,
- (b) pump means having an inlet connected to receive a mixture of said foaming agent and water, thereby to pressurize the mixture, the pump means also having an outlet,
- (c) and sub-dividing means connected with said outlet to receive the pressurized mixture, and to sub-divide same into droplets,
- (d) whereby the droplets may expand as an aqueous foam,
- (e) recirpocating metering means operated in volumetric through-put relation to said pumping means for metering a flow of said foaming agent to water to be mixed therewith at the pump means, said pump means and said metering means being positive displacement devices operating in synchronism,
- (f) and said first means to supply foaming agent comprises a sight glass reservoir having an inlet and outlet via which a stream of said agent flows from said metering means to said pump means, via and in response to operation of said reciprocating metering means.
3 more elements
Dependencies are inferred from the claim text.