Patent US4953284A successfully refreshed from Google Patents.
US4953284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for retaining a magnet within a motor assembly
Assignee: Prestolite Electric Inc
•
Filing: 1989-12-01
•
Granted: 1990-09-04
•
Expires: 2009-12-01
Abstract
Abstract A magnet shield having a recessed area for receiving a demagnetized permanent magnet. The magnet and shield are axially inserted between the armature and cylindrical frame of a motor. Locating legs formed on the end heads between which the cylindrical frame mounts serve to guide and locate the magnet shield into position. After assembly, the demagnetized magnets are magnetized.
Inventors
- 👤 Joe K. Hammer
- 👤 Alan H. Fitzsimmons
- 👤 Hans Greutmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:29
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K1/00; H02K1/06; H02K1/12; H02K1/17; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
260 words
A method of assembling a plurality of magnets in a motor having a pair of end head assemblies with rotatable bearings, an armature assembly mounted in the rotatable bearings and a frame with a cylindrical portion surrounding a coil area of the armature assembly, each of said magnets having a magnetic shield comprising providing a plurality of first locating legs on the first end head assembly; providing a plurality of second locating legs on the second end head assembly; mounting one end of the armature assembly into the bearing of one of said end head assemblies; mounting the frame onto the one end head assembly having the cylindrical portion of the frame surrounding the coil area of the armature assembly, said step of mounting including positioning the frame against said one end head assembly; providing a plurality of magnet shields with each shield having a first and second locating tab; securing said magnets in said shields; sliding each magnet and its respective shield between the coil area of the armature and the cylindrical portion of the frame; locating each of the magnet shield relative to the said one end head assembly by engaging the first locating tab on each of the shields with a respective one of said first locating legs; and positioning the second of said end head assemblies onto the other end of said armature, said step of positioning including engaging the second locating tab on each of the shields with a respective one of said second locating legs for retaining said shields relative to the armature assembly.
Claim 2
Independent Claim
260 words
A method of assembling a plurality of magnets in a motor having a pair of end head assemblies with rotatable bearings, an armature assembly mounted in the rotatable bearings and a frame with a cylindrical portion surrounding a coil area of the armature assembly, each of said magnets having a magnetic shield comprising providing a plurality of first locating legs on the first end head assembly; providing a plurality of second locating legs on the second end head assembly; mounting one end of the armature assembly into the bearing of one of said end head assemblies; mounting the frame onto the one end head assembly having the cylindrical portion of the frame surrounding the coil area of the armature assembly, said step of mounting including positioning the frame against said one end head assembly; providing a plurality of magnet shields with each shield having a first and second locating tab; securing said magnets in said shields; sliding each magnet and its respective shield between the coil area of the armature and the cylindrical portion of the frame; locating each of the magnet shield relative to the said one end head assembly by engaging the first locating tab on each of the shields with a respective one of said first locating legs; and positioning the second of said end head assemblies onto the other end of said armature, said step of positioning including engaging the second locating tab on each of the shields with a respective one of said second locating legs for retaining said shields relative to the armature assembly.
Claim 3
Dependent Claim
29 words
A method according the claim 1 and further including the step of magnetizing said magnets after the magnets and shields have been slid between the armature and the frame.
References Cited (Backward Citations)
US4505031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |