# US 9,873,210 B2 · Electric concrete saw > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,873,210 B2 - Document ID: US9873210B2 - Status: Granted - Kind: B2 - Application number: 14/599,260 - Filed: 2015-01-16 - Published: 2015-07-23 - Granted: 2018-01-23 - Earliest claimed: 2014-01-18 - Assignees: Diamond Products, Limited - Applicants: Diamond Products, Limited - Inventors: Thomas G. Ruffner - Web page: https://patentgrep.com/patent/US9873210B2 ## CPC - B28D 1/045: {Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut} - B23D 47/12: of drives for circular saw blades - B27B 5/10: Wheeled circular saws; Circular saws designed to be attached to tractors or other vehicles and driven by same {(saw assemblies designed to be mounted on or driven by tractors B27B11/12)} - E01C 23/0933: {rotary, e.g. circular-saw joint cutters} - B28D: WORKING STONE OR STONE-LIKE MATERIALS - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01) - E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H) ## Abstract A self-propelled electric concrete saw having at least two electric motors. A first electric motor of the concrete saw is powered by an external power supply and can power both a saw blade and a drive system. A second electric motor of the concrete saw is powered by a rechargeable battery and can power the drive system. The concrete saw can be maneuvered by using the second electric motor with or without the concrete saw being connected to the external power supply. ## Claims ### Claim 1 An electric concrete saw used for modifying a material, the saw comprising: a frame having a front end, a rear end and a longitudinal length extending between the front and rear ends, a saw blade that is rotatably mounted relative to the frame and configured to be driven, a rear wheel and a front wheel mounted relative to the frame for facilitating movement of the saw, a drive system mounted relative to the frame and configured to drive at least one drive wheel at a desired speed, the drive system operably connected to the at least one drive wheel, a first electric motor mounted relative to the frame and configured to be operably connectable to an associate first power supply for receiving power therefrom, the first electric motor having a first rotational output operably connected to the saw blade for driving the saw blade and selectively operably connected to the drive system, a second electric motor mounted relative to the frame having a second rotational output, the second electric motor operating independent of the first electric motor wherein the second rotational output is selectively operably connected to the drive system and operates independent of the rotation of the saw blade, the second motor is operably connectable to a second power supply, a de-coupler adapted to selectively decouple at least one of the first electric motor and the second electric motor from the drive system, a controller configured to control operation of the first electric motor and the second electric motor, wherein the concrete saw is operable in a first mode where the at least one drive wheel is driven by the first electric motor and the saw blade is operable, and wherein the concrete saw is operable in a second mode where the at least one drive wheel is driven by the second electric motor for movement of the electric concrete saw only wherein the saw blade is inoperable. ### Claim 2 (depends on 1) The electric concrete saw according to claim 1, wherein the associated first power supply is an associated external power supply and the second power supply is an internal power supply. ### Claim 3 (depends on 2) The electric concrete saw according to claim 2, wherein the second power supply includes an internal rechargeable battery. ### Claim 4 (depends on 3) The electric concrete saw according to claim 3, wherein the second power supply is recharged when the concrete saw is operating by the associated external power supply. ### Claim 5 (depends on 1) The electric concrete saw according to claim 1, further comprising a hydraulic system and a third electric motor, wherein the third electric motor is operably connected to the hydraulic system and provides power to the hydraulic system for relative movement between the saw blade and an associated material to be modified, the third electric motor operating independent of the first electric motor and operates independent of the rotation of saw blade. ### Claim 6 (depends on 1) The electric concrete saw according to claim 1, wherein the first electric motor is a three phase motor rated from about 20 horse power (HP) to about 50 HP and the first electric motor operates at a voltage from about 300 volts to about 500 volts. ### Claim 7 (depends on 6) The electric concrete saw according to claim 6, wherein the first electric motor operates at a voltage greater than 400 volts. ### Claim 8 (depends on 1) The electric concrete saw according to claim 1, wherein the second electric motor is rated from at least one of about ⅕ HP up to about 3 HP, and from about 12 volts to about 180 volts. ### Claim 9 (depends on 8) The electric concrete saw according to claim 8, wherein the second electric motor is a direct current motor rated at about 2 HP. ### Claim 10 (depends on 1) The electric concrete saw according to claim 1, wherein the de-coupler is operatively connected between the first electric motor and the at least one drive wheel, wherein the first electric motor is decoupled from the at least one drive wheel when the concrete saw is operating in the second mode. ### Claim 11 (depends on 10) The electric concrete saw according to claim 10, wherein the de-coupler is operatively connected between the second electric motor and the at least one drive wheel, wherein the second electric motor is decoupled from the at least one drive wheel when the concrete saw is operating in the first mode. ### Claim 12 (depends on 10) The electric concrete saw according to claim 10, wherein the drive system includes an input shaft selectively connected to the first electric motor and the second electric motor for powering the drive system. ### Claim 13 (depends on 10) The electric concrete saw according to claim 10, wherein the concrete saw is operable in the first mode only when connected to the associated external power supply. ### Claim 14 (depends on 1) The electric concrete saw according to claim 1, wherein the de-coupler is operatively connected between the second electric motor and the at least one drive wheel, wherein the second electric motor is decoupled from the at least one drive wheel when the concrete saw is operating in the first mode. ### Claim 15 (depends on 1) The electric concrete saw according to claim 1, wherein the de-coupler includes a clutch bearing. ### Claim 16 (depends on 1) The electric concrete saw according to claim 1, wherein the drive system includes a hydraulic transmission. ### Claim 17 (depends on 16) The electric concrete saw of claim 16, wherein the drive system further includes a gear mechanism. ### Claim 18 (depends on 1) The electric concrete saw according to claim 1, wherein the controller is configured to make the concrete saw non-operable in the second mode when the concrete saw is connected to the associated first power supply. ### Claim 19 (depends on 1) The electric concrete saw according to claim 1, wherein the at least one drive wheel is a pair of drive wheels. ### Claim 20 (depends on 19) The electric concrete saw according to claim 19, wherein the pair of drive wheels is a pair of rear drive wheels.