Patent US4253675A successfully refreshed from Google Patents.
US4253675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements of sealed shafts
Assignee: Bellofram Corp
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Filing: 1979-11-01
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Granted: 1981-03-03
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Expires: 1999-11-01
Abstract
Abstract A shaft sealing precluding fluid from moving in a direction longitudinally of the shaft. At the same time the shaft sealing allows a motion of the shaft in axial direction, an inclination of the shaft, and may also allow a rotary motion of the shaft relative to its sealing means. The sealing means is a rolling diaphragm including a clamping flange on one end of the rolling wall thereof. The other end of the rolling diaphragm is provided with a cylindrical elastomeric member having a projection conforming substantially with the shape of a portion of reduced diameter of the shaft and engaging under pressure said portion of reduced diameter. The rolling diaphragm includes an elastomeric ply and a fabric reinforcement of the ply. The fabric reinforcement is removed from a region of the aforementioned projection of said rolling diaphragm to provide an interface between said portion of reduced diameter of, or cavity in, said shaft and said projection where the radially inward pressure of said projection is not limited by the presence of said fabric reinforcement.
Inventors
- 👤 Wilfred H. St. Laurent, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:40
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/06; F16J15/00; F16J15/50; F16J15/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
A sealed shaft comprising in combination (a) a shaft having a pair of axially outer portions of relatively large outer diameter and a contiguous axially inner portion of relatively small diameter, said axially inner portion defining an annular cavity in said shaft; (b) a rolling diaphragm including an elastomeric ply and a fabric reinforcement of said ply, said rolling diaphragm having a convoluted rolling wall and attachment means on both ends of said rolling wall; (c) one of said attachment means including a clamping flange on the radially outer end of said rolling diaphragm; (d) the other of said attachment means on the radially inner end of said rolling diaphragm comprising an elastomeric sleeve arranged in coaxial relation to and surrounding said shaft and including an annular projection projecting into said cavity and conforming to the shape thereof, said projection exerting a radially inward pressure on said portion of said shaft of relatively small diameter; and (e) said fabric reinforcement being removed from a region of said annular projection to provide an interface between said cavity in said shaft and said projection where the radially inward pressure of said projection is not limited by the presence of said fabric reinforcement.
Claim 2
Dependent Claim
200 words
A sealed shaft comprising in combination (a) a shaft having a pair of axially outer portions of relatively large outer diameter and a contiguous axially inner portion of relatively small diameter, said axially inner portion defining an annular cavity in said shaft; (b) a rolling diaphragm including an elastomeric ply and a fabric reinforcement of said ply, said rolling diaphragm having a convoluted rolling wall and attachment means on both ends of said rolling wall; (c) one of said attachment means including a clamping flange on the radially outer end of said rolling diaphragm; (d) the other of said attachment means on the radially inner end of said rolling diaphragm comprising an elastomeric sleeve arranged in coaxial relation to and surrounding said shaft and including an annular projection projecting into said cavity and conforming to the shape thereof, said projection exerting a radially inward pressure on said portion of said shaft of relatively small diameter; and (e) said fabric reinforcement being removed from a region of said annular projection to provide an interface between said cavity in said shaft and said projection where the radially inward pressure of said projection is not limited by the presence of said fabric reinforcement.
Claim 3
Dependent Claim
48 words
A sealed shaft as specified in claim 1 wherein said cavity in said shaft and said projection on the radially inner end of said rolling diaphragm are graded and wherein said fabric reinforcement is trimmed out in the portion of said projection where its inner diameter is narrowest.
Claim 4
Dependent Claim
136 words
An elastomeric rolling diaphragm for the passage of a shaft from one of a pair of spaces to another wherein a different pressure prevails, said rolling diaphragm comprising (a) a rolling wall having a clamping flange on the radially outer end thereof; (b) the radially inner end of said rolling wall being thicker than said rolling wall proper and forming an annular radially inward directed projection adapted to enter into and to conform to an annular cavity in a shaft and to exert a radially inward pressure against a fixed point of said shaft; and (c) said radially outer end of said rolling diaphragm and said rolling wall thereof having a fabric reinforcement, but at least a portion of said annular radially inward directed projection being free of said fabric reinforcement to increase the resiliency thereof.
Claim 5
Dependent Claim
136 words
An elastomeric rolling diaphragm for the passage of a shaft from one of a pair of spaces to another wherein a different pressure prevails, said rolling diaphragm comprising (a) a rolling wall having a clamping flange on the radially outer end thereof; (b) the radially inner end of said rolling wall being thicker than said rolling wall proper and forming an annular radially inward directed projection adapted to enter into and to conform to an annular cavity in a shaft and to exert a radially inward pressure against a fixed point of said shaft; and (c) said radially outer end of said rolling diaphragm and said rolling wall thereof having a fabric reinforcement, but at least a portion of said annular radially inward directed projection being free of said fabric reinforcement to increase the resiliency thereof.
Claim 6
Dependent Claim
46 words
An elastomeric rolling diaphragm as specified in claim 3 wherein said radially inward projection is graded to fit into a graded cavity in said shaft and said fabric reinforcement is trimmed out only in the region of said projection where the inner diameter thereof is smallest.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |