Patent US3991701A successfully refreshed from Google Patents.
US3991701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing wear detecting device for canned motor driven pumps
Assignee: Nikkiso Co Ltd
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Filing: 1975-08-21
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Granted: 1976-11-16
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Expires: 1995-08-21
Abstract
Abstract A bearing wear detecting device for canned motor driven pumps is disclosed. The device comprise a rotary shaft of a canned motor driven pump having a hole extending in an axial direction from one end of said rotary shaft; an enlarged chamber formed in said hole at a position distant apart from said one end of said rotary shaft by a given distance and having a diameter larger than that of said hole and forming shoulders at boundaries between said hole and said enlarged chamber; and a hermetically sealed pipe provided at its one end with an enlarged sensitive portion and at another end an indicator; said enlarged sensitive portion being enclosed in said enlarged chamber of said rotary shaft. To the one end of the rotary shaft may be secured an end nut with said hole and said enlarged chamber formed therein. The hermetically sealed pipe may be composed of an indicating part and a detecting part telescopically engaged with each other.
Inventors
- 👤 Ryuich Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:36
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/02; F04D15/0245; F04D15/0272; G; G01; G01B; G01B5/00; G01B5/14; G01B5/146; G01M; G01M13/00; G01M13/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
A bearing wear detecting device for canned motor driven pumps, comprising a rotary shaft of a canned motor driven pump having a hole extending in an axial direction from one end of said rotary shaft; an enlarged chamber formed in said rotary shaft at a position distant apart from said one end of said rotary shaft by a given distance and having a diameter larger than that of said hole and forming shoulders at boundarys between said hole and said enlarged chamber; and a hermetically sealed pipe provided at its one end with an enlarged sensitive portion and at another end with an indicator, said enlarged sensitive portion being enclosed in said enlarged chamber of said rotary shaft, whereby when the bearing wear causes said rotary shaft to move in a thrust direction, said shoulders are urged against a part of said enlarged end sensitive portion of said hermetically sealed pipe to rupture it and when the bearing wear causes said rotary shaft to move in a radial direction, the inner peripheral wall of said enlarged chamber is urged against the outer peripheral portion of said enlarged end sensitive portion of said hermetically sealed pipe to rupture it, thereby indicating the degree of the bearing wear.
Claim 2
Dependent Claim
206 words
A bearing wear detecting device for canned motor driven pumps, comprising a rotary shaft of a canned motor driven pump having a hole extending in an axial direction from one end of said rotary shaft; an enlarged chamber formed in said rotary shaft at a position distant apart from said one end of said rotary shaft by a given distance and having a diameter larger than that of said hole and forming shoulders at boundarys between said hole and said enlarged chamber; and a hermetically sealed pipe provided at its one end with an enlarged sensitive portion and at another end with an indicator, said enlarged sensitive portion being enclosed in said enlarged chamber of said rotary shaft, whereby when the bearing wear causes said rotary shaft to move in a thrust direction, said shoulders are urged against a part of said enlarged end sensitive portion of said hermetically sealed pipe to rupture it and when the bearing wear causes said rotary shaft to move in a radial direction, the inner peripheral wall of said enlarged chamber is urged against the outer peripheral portion of said enlarged end sensitive portion of said hermetically sealed pipe to rupture it, thereby indicating the degree of the bearing wear.
Claim 3
Dependent Claim
49 words
The bearing wear detecting device for canned motor driven pumps as claimed in claim 1, wherein said chamber is provided with two shoulders spaced at a predetermined distance from each other, either one of said shoulders being urged against said end sensitive portion on movement in the thrust direction.
Claim 4
Dependent Claim
40 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1, comprising further an end nut detachably engaged with said one end of said rotary shaft and provided therein with a hole and an enlarged chamber.
Claim 5
Dependent Claim
20 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1, wherein said hole is elliptical.
Claim 6
Dependent Claim
20 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1, wherein said hole is rectangular.
Claim 7
Dependent Claim
20 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1, wherein said hole is polygonal.
Claim 8
Dependent Claim
99 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1, wherein said hermetically sealed pipe is composed of an indicating part provided at its rear end with an indicator and a detecting part provided at its front end with said enlarged sensitive portion, said indicating and detecting parts including joint pipes made integral therewith, respectively, and telescopically engaged and hermetically sealed with each other when said device is mounted on a canned motor driven pump, said indicating part being inserted into and around said detecting part while increasing the inside pressure of the device.
Claim 9
Dependent Claim
103 words
A bearing wear detecting device for canned motor driven pumps as claimed in claim 1 and comprising further a hollow end nut threadedly engaged with one end of said rotary shaft of a canned motor driven pump and engaged with said sensitive portion of said detecting part, whereby said sensitive portion of said detecting part becomes worn and ruptured to leak out a pressure gas contained therein when said end nut is urged against it due to deviation of said rotary shaft in front and rear thrust directions, a radial direction and a composite direction resulted from both said thrust and radial directions.
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) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |