Patent US4408382A successfully refreshed from Google Patents.
US4408382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing and replacing shrunk-on sleeves on a shaft
Assignee: Siemens Energy Inc
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Filing: 1981-12-21
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Granted: 1983-10-11
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Expires: 2001-12-21
Abstract
Abstract A method for removing and replacing shrunk-on sleeves on a shaft utilizing a fixture having upper and lower portions electrically insulated from each other and stand off insulated studs and pads which support the sleeve and induction coil within the fixture, the fixture having insulated parts which minimize circulating currents in the fixture that would result in heating of the fixture.
Inventors
- 👤 Ira J. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:50
CPC Classifications
B; B23; B23P; B23P11/00; B23P11/02; B23P11/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49815; Y10T29/49817; Y10T29/49819; Y10T29/49821; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A method for removing a sleeve shrunk on a shaft comprising the steps of: placing an induction coil so that it encircles the sleeve; attaching a fixture to the sleeve in such a manner that the sleeve and induction coil can be supported by the fixture; applying alternating current to the induction coil until the temperature of the sleeve rises to a level wherein there is clearance between the sleeve and the shaft; removing the fixture induction coil and sleeve from the shaft; and placing insulation around the removed sleeve so that it cools slowly and evenly to minimize distortion of the sleeve.
Claim 2
Independent Claim
103 words
A method for removing a sleeve shrunk on a shaft comprising the steps of: placing an induction coil so that it encircles the sleeve; attaching a fixture to the sleeve in such a manner that the sleeve and induction coil can be supported by the fixture; applying alternating current to the induction coil until the temperature of the sleeve rises to a level wherein there is clearance between the sleeve and the shaft; removing the fixture induction coil and sleeve from the shaft; and placing insulation around the removed sleeve so that it cools slowly and evenly to minimize distortion of the sleeve.
Claim 3
Dependent Claim
19 words
The method as set forth in claim 1 and further comprising the step of matchmarking the shaft and sleeve.
Claim 4
Dependent Claim
29 words
The method as set forth in claim 1 and further comprising the step of monitoring the temperature of the sleeve to ensure that it does not exceed 800° F.
Claim 5
Independent Claim
90 words
A method of installing a shrunk-on sleeve on a shaft comprising the steps of placing an induction coil so that it encircles the sleeve; attaching a fixture to the sleeve in such a manner that the sleeve and induction coil are supported by the fixture; applying alternating current to the induction coil until the temperature of the sleeve reaches a predetermined value; sliding the heated sleeve over the shaft; affixing the location of the sleeve on the shaft; and rotating the shaft at a low speed as the sleeve cools.
Claim 6
Independent Claim
90 words
A method of installing a shrunk-on sleeve on a shaft comprising the steps of placing an induction coil so that it encircles the sleeve; attaching a fixture to the sleeve in such a manner that the sleeve and induction coil are supported by the fixture; applying alternating current to the induction coil until the temperature of the sleeve reaches a predetermined value; sliding the heated sleeve over the shaft; affixing the location of the sleeve on the shaft; and rotating the shaft at a low speed as the sleeve cools.
Claim 7
Dependent Claim
38 words
The method as set forth in claim 4 and further comprising the step of blowing air on one end of the sleeve to cool the end more rapidly to set the location of that end of the sleeve.
Claim 8
Dependent Claim
28 words
The method as set forth in claim 4 and further comprising the step of monitoring the temperature of the sleeve as it is heated by the induction coil.
Claim 9
Dependent Claim
29 words
The method as set forth in claim 4 wherein the step of monitoring the temperature includes monitoring the temperature to ensure that the temperature does not exceed 800° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |