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US 5,861,694 AGranted
Field retaining mechanism for a permanent magnet D.C. motor
AssigneeRyobi North America, Inc.
InventorPaul W. Niemela
Life of this patent
Estimating the term…
Abstract
A generally T-shaped clip is fit into notches formed in the field shell of a permanent magnet D.C. motor. The clip has a passageway formed through its top surface for receiving a screw or the like to secure the field shell to a surrounding tool housing. The notches have a top portion with an elongated portion that has a concave inner side to abut the outer surface of the field shell and retain the clip in the notches. The clip has a bottom portion that is bent so that it contacts the screw to prevent it from turning and loosening.
Claims7
A tool comprising:
- a housing;
- a permanent magnet D.C. motor located within said housing, said permanent magnet D.C. motor including a pair of permanent magnets, a field shell having an inner surface for supporting said pair of permanent magnets, an outer surface, and an end having a plurality of notches formed therein;
- a plurality of generally T-shaped clips each having a top portion including an elongated head and a relatively smaller neck sized to fit within the plurality of notches, such that an inner surface of said elongated head abuts said outer surface of said field shell, the top portion having a passageway formed therein;
- a plurality of fasteners sized for insertion through said passageways for attaching each of said generally T-shaped clips to said tool housing for securing said field shell thereto.
1 more element
Dependencies are inferred from the claim text.