Granted Patent B2

US 10,022,848 · App. 14/444,982 · Granted Jul 17, 2018

Inventors: Paul Gerard Gross (White Marsh, MD); Marco Alessandro Mattucci (Fallston, MD)

Assignee: BLACK & DECKER INC.

B25C1/06B25F5/00

Abstract

Claims (47)

1. A power tool, comprising:

an electric motor having a stator and a rotor, the rotor having a rotor shaft;

said rotor shaft coupled to a flywheel;

said flywheel having an overlapping portion which is cantilevered over at least a portion of said stator;

said flywheel having a contact surface adapted to impart energy from said flywheel when contacted by a moveable member; and

said overlapping portion adapted to rotate radially about said at least a portion of said stator;

wherein said rotor is an inner rotor;

wherein said electric motor is a brushed motor; and

wherein said overlapping portion includes the contact surface;

wherein the contact surface comprises a flywheel ring including at least one groove; and

wherein the movable member is a driver which includes a driver profile configured to frictionally engage the flywheel ring.

2. The power tool according to claim 1 , wherein the overlapping portion is cantilevered over at least a portion of said rotor.

3. The power tool according to claim 1 , wherein said flywheel ring and said rotor shaft rotate in a ratio in a range of between 0.5:1.5 and 1.5:0.5.

4. The power tool according to claim 3 , wherein said flywheel ring rotates at a speed in a range of from about 2500 rpm to about 20000 rpm.

5. The power tool according to claim 3 , wherein the contact surface which has a speed in a range of from about 20 ft/s to about 200 ft/s.

6. The power tool according to claim 3 , wherein said flywheel ring has an inertia in a range of from about 10 J(kg*m^2) to about 500 J(kg*m^2).

7. The power tool according to claim 1 , wherein said flywheel ring and said rotor shaft rotate in a ratio of about 1:1.

8. The power tool according to claim 1 , wherein said power tool is a nailer adapted to drive a nail.

9. The power tool according to claim 1 , wherein said flywheel ring rotates at a speed in a range of from about 5600 rpm to about 10000 rpm.

10. A fastening device, comprising:

a motor having a stator;

a cantilevered flywheel driven by the motor;

said cantilevered flywheel having a contact surface adapted for frictional contact with a driving member adapted to drive a fastener;

said cantilevered flywheel having an overlapping portion which is cantilevered over at least a portion of said stator;

wherein said motor has an inner rotor;

wherein the overlapping portion includes the contact surface;

wherein the contact surface includes at least two grooves; and

wherein the motor is a brushed motor.

11. The fastening device according to claim 10 , wherein said cantilevered flywheel is a cupped flywheel.

12. The fastening device according to claim 10 , wherein said cantilevered flywheel is adapted to have a flywheel energy in a range of from about 10 j to about 1500 j.

13. A power tool, comprising:

a motor having a stator and a rotor, the rotor having a rotor axis;

a flywheel adapted for turning by said motor, said flywheel having a flywheel portion coaxial to said rotor axis;

said flywheel portion at least in part located over at least a portion of said stator;

wherein said flywheel is a cupped flywheel having a cupped flywheel portion which radially surrounds at least a portion of said stator;

wherein the flywheel has a flywheel ring;

wherein the flywheel ring includes at least one groove;

the power tool further comprising a driver, the driver receiving energy from the flywheel to drive a nail;

wherein the driver includes a driver profile configured to engage the flywheel ring; and

wherein the flywheel ring is disposed on the cupped flywheel portion of the flywheel.

14. The power tool of claim 13 , wherein the rotor has a rotor longitudinal axis and a rotor shaft extending along the rotor longitudinal axis, the rotor shaft rotating along with the rotor;

wherein the stator is positioned radially outside of the rotor; and

wherein the flywheel is attached to the rotor shaft.

15. The power tool of claim 14 , wherein flywheel ring includes at least two grooves.

16. The power tool of claim 15 , further comprising a motor housing, the motor housing located outside of the stator and at least partially surrounding the rotor and the stator; and

wherein the flywheel overlaps at least a portion of the motor housing.

17. The power tool of claim 13 , wherein the motor is a brushed motor.

Assignments (1)

Continuity (1)

Cited By (11)

US 12,345,013 US 12,365,072 US 12,434,367 US 12,459,091 US 12,496,693 US 12,502,756 US 12,533,778 US 12,544,893 US 12,569,967 US 12,629,806 US 12,661,767