# US 12,180,727 B2 · Crack-filling joint pump applicable to polished concrete floors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,180,727 B2 - Document ID: US12180727B2 - Status: Granted - Kind: B2 - Application number: 17/687,898 - Filed: 2022-03-07 - Published: 2022-12-22 - Granted: 2024-12-31 - Earliest claimed: 2021-06-22 - Applicants: Refuse Materials, Inc. - Inventors: Donald A. Pope, Jr. - Web page: https://patentgrep.com/patent/US12180727B2 ## CPC - B05C 11/1036: {Means for supplying a selected one of a plurality of liquids or other fluent materials, or several in selected proportions, to the applying apparatus} - E04G 23/0203: {Arrangements for filling cracks or cavities in building constructions} - B05C 5/02: {the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g.} from an outlet device in contact or almost in contact, with the work - B05C 17/002: {with feed system for supplying material from an external source; Supply controls therefor (B05C17/02 takes precedence)} - B62B 1/26: characterised by supports specially adapted to objects of definite shape - E04F 21/24: of masses made in situ, e.g. smoothing tools {(E04F21/04 takes precedence; finishing of concrete roads or pavings E01C19/40; devices for levelling concrete floors E04G21/10; devices for solidifying concrete floors by vibrating E04G21/066)} - B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08) - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS - B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M) - E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B) ## Abstract Lightweight, battery-operated, walk-behind joint- and crack-filling equipment has no belts or chains to wear out, and no inverters or other electrical power-conversion apparatus. A single brushless battery-operated DC motor, directly coupled to two pumps, simultaneously delivers the resin and hardener to a wand, such that a single user can push the cart and apply the mixture. The portable cart includes a frame with a handle and single set of right and left wheels accommodates two containers holding the hardening components. The containers may be pails or buckets or bag-in-box containers that may be compressed and collapsed after use to reduce waste requirements. The boxes and/or bags may also be biodegradable for a more environmentally friendly solution. ## Claims ### Claim 1 A walk-behind machine for dispensing a two-part hardening material, comprising: a frame with a handle and a single set of right and left wheels; wherein the frame accommodates two containers holding first and second parts of a hardening mixture; at least one battery supported on the frame; an electric motor supported on the frame and powered by the at least one battery; wherein the motor is coupled to a gearbox operative to simultaneously drive outwardly extending opposing axles; each axle being coupled to a respective pump, each pump having an inlet and an outlet, and wherein the inlets to the pumps are adapted for coupling to the respective containers supported by the frame, and the outlets of the pumps are adapted for coupling to a dispensing wand through separate lengths of flexible tubing, wherein the separate lengths of flexible tubing each extend from the outlet of the respective pump to the dispensing wand; and wherein the machine has no belts, chains, or electrical power-conversion apparatus. ### Claim 2 (depends on 1) The machine of claim 1, including two 12-V car batteries powering a 24-volt motor. ### Claim 3 (depends on 1) The machine of claim 1, wherein the wand includes an ON-OFF switch for the motor. ### Claim 4 (depends on 1) The machine of claim 1, wherein the containers are bag-in-box containers adapted for coupling to the respective pumps. ### Claim 5 (depends on 1) The machine of claim 1, wherein the frame includes an upper section configured to hold the two containers. ### Claim 6 (depends on 5) The machine of claim 5, wherein the at least one battery, the electric motor, and the pumps are mounted underneath the upper section. ### Claim 7 (depends on 6) The machine of claim 6, wherein the two containers are fluidly connected to the two pumps via separate feed lines. ### Claim 8 (depends on 5) The machine of claim 5, wherein the upper section includes an on-board battery charger for charging the at least one battery. ### Claim 9 (depends on 1) The machine of claim 1, wherein the electric motor is a DC motor directly coupled to the pumps via the gearbox. ### Claim 10 A walk-behind machine for dispensing a two-part hardening material, comprising: a frame with a handle and a set of right and left wheels; two containers accommodated by the frame for holding first and second parts of a hardening mixture; at least one battery supported on the frame; an electric motor supported on the frame and powered by the at least one battery; wherein the electric motor is coupled to a gearbox operative to simultaneously drive outwardly extending opposing axles; two pumps each coupled to a respective one of the axles, each pump having an inlet and an outlet, and wherein the inlets to the two pumps are adapted for coupling to the respective containers supported by the frame via separate feed lines, and the outlets of the pumps are adapted for coupling to a dispensing wand via separate lines of flexible tubing; wherein the separate lines of flexible tubing each extend from the outlet of the respective pump to the dispensing wand; and wherein the machine has no belts, chains, or electrical power-conversion apparatus. ### Claim 11 (depends on 10) The machine of claim 10, wherein the electric motor is a DC motor directly coupled to the pumps via the gearbox. ### Claim 12 (depends on 10) The machine of claim 10, wherein the at least one battery includes two 12-V batteries. ### Claim 13 (depends on 10) The machine of claim 10, wherein the two containers are bag-in-box containers adapted for coupling to the respective pumps. ### Claim 14 (depends on 10) The machine of claim 10, wherein the frame includes an upper section configured to hold the two containers. ### Claim 15 (depends on 14) The machine of claim 14, wherein the at least one battery, the electric motor, and the pumps are mounted underneath the upper section. ### Claim 16 (depends on 14) The machine of claim 14, wherein the upper section includes an on-board battery charger for charging the at least one battery.