ELECTRIC CONCRETE SAW

• US 20150202796A1
• Filed: 01/16/2015
• Published: 07/23/2015
• Est. Priority Date: 01/18/2014
• Status: Active Grant

• Current Assignee: Diamond Products Limited
• Original Assignee: Diamond Products Limited
• Inventors: Ruffner, Thomas G.
• Granted Patent: US 9,873,210 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23D 47/12 of drives for circular saw blades
• CPC Class Codes: 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
• CPC Class Codes: B28D 1/045 Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut
• CPC Class Codes: E01C 23/0933 rotary, e.g. circular-saw joint cutters

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

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 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 of the rear wheel and the front wheel as a drive wheel at a desired speed, the drive system operably connected to the 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 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 and operably connectable to a second power supply, the second electric motor having a rotational output selectively operably connected to the drive system,

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 drive wheel is driven by the first electric motor, and wherein the concrete saw is operable in a second mode where the drive wheel is driven by the second electric motor.

2. 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.

3. The electric concrete saw according to claim 2, wherein the second power supply includes an internal rechargeable battery is recharged when the concrete saw is operating by the associated external power supply.

4. 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.

5. 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.

6. 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.

7. The electric concrete saw according to claim 6, wherein the first electric motor operates at a voltage greater than 400 volts.

8. 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.

9. The electric concrete saw according to claim 8, wherein the second electric motor is a direct current motor rated at about 2 HP.

10. The electric concrete saw according to claim 1, wherein the de-coupler is operatively connected between the first electric motor and the drive wheel, wherein the first electric motor is decoupled from the drive wheel when the concrete saw is operating in the second mode.

11. The electric concrete saw according to claim 10, wherein and the de-coupler is operatively connected between the second electric motor and the drive wheel, wherein the second electric motor is decoupled from the drive wheel when the concrete saw is operating in the first mode.

12. The electric concrete saw according to claim 1, wherein and the de-coupler is operatively connected between the second electric motor and the drive wheel, wherein the second electric motor is decoupled from the drive wheel when the concrete saw is operating in the first mode.

13. The electric concrete saw according to claim 1, wherein the de-coupler includes a clutch bearing.

14. The electric concrete saw according to claim 1, wherein the drive system includes a hydraulic transmission.

15. The electric concrete saw of claim 14, wherein the drive system further includes a gear mechanism.

16. 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.

17. 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.

18. The electric concrete saw according to claim 1, wherein the concrete saw is not operable in the second mode when the concrete saw is connected to the associated first power supply.

19. The electric concrete saw according to claim 1, wherein the drive wheel is a pair of drive wheels.

20. The electric concrete saw according to claim 1, wherein the pair of drive wheels is a pair of rear wheels.