Reversing mechanism for electric motors
AssigneeBlack & Decker Inc.
InventorsAlvydas P. Karasa, Thomas J. Howard, Jr.
Life of this patent
Estimating the term…
Abstract
A power tool has a mechanism to reverse a motor. The mechanism includes a first member secured with the motor surrounding the motor commutator. A pair of electrical contacts are supported in the first member. A second member is rotatable on the fist member. The second member carries a pair of brush holders which include electrical contacts. As the second member is rotated in the first member, the electrical contacts of the brush holders, as well as the electrical contacts in the first member, electrically couple with one another from a first position to a second position which relates to a forward and reverse direction of the motor. A lever moves the second member between its first and second positions.
Claims32
A reversing mechanism for a motor, comprising:
- a first member to be secured with a motor winding, said first member adjacent a commutator, and a pair of electrical contacts on said first member, said electrical contacts to be coupled with the motor winding;
- a second member, said second member coupled with said first member, said second member adjacent the commutator and aligned with said first member, a pair of brush holders mounted on said second member, electrical contacts extending from said brush holders for electrically coupling with said pair of electrical contacts, and said second member movable on said first member such that when said second member is in a first position each electrical contact of said pair of electrical contacts is electrically coupled with one of said brush holder electrical contacts and movable to a second position wherein each electrical contact is electrically coupled with the other of said brush holder electrical contacts.
A power tool comprising:
- a housing, a motor within said housing, a power supply electrically coupled with said motor, an output coupled with said motor, and a mechanism for reversing said motor comprising:
- a first member associated with a motor winding, said first member adjacent a commutator, and a pair of electrical contacts on said first member, said electrical contacts to be coupled with the motor winding;
- a second member, said second member coupled with said first member, said second member receiving the commutator and aligned with said first member, a pair of brush holders mounted on said second member, electrical contacts extending from said brush holders for electrically coupling with said pair of electrical contacts, and said second member movable on said first member such that said second member is in a first position each electrical contact of said pair of electrical contacts is electrically coupled with one of said brush holder electrical contacts and rotatable to a second position wherein each electrical contact is electrically coupled with the other of said brush holder electrical contacts.
A power tool comprising:
- a housing, a motor within said housing, a power supply electrically coupled with said motor, an output coupled with said motor, and a mechanism for reversing said motor, said mechanism adjacent a commutator of said motor and having an activating coupling, and a member mounted on said housing for activating said reversing mechanism, said member coupled with said activating coupling, a pivot on said member enabling pivoting of said member between first, second and third positions for forward, neutral and reverse movement of said motor.
Dependencies are inferred from the claim text.