Patent US3681779A successfully refreshed from Google Patents.
Patent US3675933A successfully refreshed from Google Patents.
US3675933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal with installed space parts
Assignee: John Crane Inc
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Filing: 1970-09-03
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Granted: 1972-07-11
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Expires: 1990-09-03
Abstract
Abstract To avoid the necessity of disassembling a drive for a pump to replace worn or defective parts of an end face shaft seal, provision is made for assembling around the shaft replacement parts for the seal at the time the original installation of the shaft seal is made. The subsequently worn or defective parts of the seal are destroyed and removed and the stored replacement parts are moved axially into place in he seal. The gland plate is split and removable to allow the replacement parts to pass through the gland plate to the seal. Worn parts which cannot be destroyed are moved to an annular storage space in housing provided for this purpose.
Inventors
- 👤 William D Nappe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:11
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464; F16J15/3488
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
The combination with relatively rotatable elements comprising a housing and a shaft passing through said housing, said housing having a seal cavity around said shaft, of seal means in the cavity in sealing relation to the housing and shaft, said seal means having an expendable part, a duplicate expendable part disposed around the shaft in axially spaced relation to said seal means, means on one of said elements supporting said duplicate part in fixed relation to said one of said elements, a split abutment between said seal means and duplicate part, said abutment being removable radially of said shaft, whereby to make the expendable part of the seal means accessible for removal and replacement by said duplicate expendable part, a sleeve on said shaft slidable axially thereon, means for sealing said sleeve with respect to said shaft and means for securing the sleeve to the shaft for rotation therewith, said seal means being mounted on said sleeve and said sleeve passing through said duplicate expendable part.
Claim 2
Dependent Claim
166 words
The combination with relatively rotatable elements comprising a housing and a shaft passing through said housing, said housing having a seal cavity around said shaft, of seal means in the cavity in sealing relation to the housing and shaft, said seal means having an expendable part, a duplicate expendable part disposed around the shaft in axially spaced relation to said seal means, means on one of said elements supporting said duplicate part in fixed relation to said one of said elements, a split abutment between said seal means and duplicate part, said abutment being removable radially of said shaft, whereby to make the expendable part of the seal means accessible for removal and replacement by said duplicate expendable part, a sleeve on said shaft slidable axially thereon, means for sealing said sleeve with respect to said shaft and means for securing the sleeve to the shaft for rotation therewith, said seal means being mounted on said sleeve and said sleeve passing through said duplicate expendable part.
Claim 3
Dependent Claim
61 words
The combination described in claim 1, said expendable part comprising a frangible sealing washer, and said seal means having an expendable removable secondary seal and an expendable rigid washer, said cavity being longer than said sealing means, and said expendable rigid washer being movable into said cavity beyond said sealing means when the secondary seal and frangible sealing washer are expended.
Claim 4
Dependent Claim
38 words
The combination described in claim 2, said seal means comprising a split retainer, axially directed spring means in the retainer adapted to exert axial pressure upon the secondary seal, and means for driving the retainer from the shaft.
Claim 5
Dependent Claim
126 words
The combination described in claim 1, said expendable part comprising a frangible sealing washer and said seal means having an expendable removable secondary seal and an expendable metal seal seat adapted to have running sealing engagement with said frangible sealing washer, means for fixing said metal seat against relative rotation with said housing, said abutment comprising a split gland plate, an axially slidable sleeve on said shaft, means for fixing said sleeve to said shaft, said seal means comprising further a split retainer adapted to be fixed to said sleeve, said frangible washer and secondary seal being disposed within said retainer, and there being a duplicate metal seal seat and a duplicate secondary seal disposed around said shaft in axially spaced relation to said seal means.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |