US3872777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm
Assignee: Berg Manufacturing Co
•
Filing: 1973-05-30
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Granted: 1975-03-25
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Expires: 1993-05-30
Abstract
Abstract A cup-shaped diaphragm formed of fabric reinforced resilient material, such as rubber, has a plurality of fingers at the merger of the base or body portion and the conical wall of the diaphragm. The fingers are uniformly spaced and are effective to prevent rubbing of the piston against the merger of the conic wall and the body portion, thereby precluding excessive wear of the diaphragm at this point.
Inventors
- 👤 Victor Mastis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:52
CPC Classifications
F; F01; F01B; F01B19/00; F01B19/02; F16; F16J; F16J3/00; F16J3/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
255 words
A cup-shaped diaphragm of fabric reinforced resilient material for use in an actuator having a housing and a piston member adapted to engage a diaphragm, said diaphragm having an annular outer lip adapted to engage a housing, an annular conic wall merging with said lip and a body portion merging with said annular conic wall at a zone of merger thereof, said annular conic wall and said body portion together forming a concave element, and a plurality of independent spaced fingers each of generally circular cross section extending from said body portion and being integral therewith and said annular conic wall of said concave element, said fingers being arranged in a plurality of rows circumferentially spaced from one another, a first of said rows being positioned adjacent the zone of merger of said body portion with said annular conic wall, said fingers of said first row having one side shorter than another side thereof, a second of said rows being positioned adjacent said zone of merger of said conic wall opposite said first row, said fingers of said second row having one side shorter than another side thereof, a third of said rows being positioned within and being integral with said zone of merger, said fingers of said third row having equal sides, said fingers of said first and second rows being generally aligned radially with respect to said body portion and said conic wall and said fingers of said third row being misaligned with respect to said fingers of said first and second rows.
Claim 2
Dependent Claim
255 words
A cup-shaped diaphragm of fabric reinforced resilient material for use in an actuator having a housing and a piston member adapted to engage a diaphragm, said diaphragm having an annular outer lip adapted to engage a housing, an annular conic wall merging with said lip and a body portion merging with said annular conic wall at a zone of merger thereof, said annular conic wall and said body portion together forming a concave element, and a plurality of independent spaced fingers each of generally circular cross section extending from said body portion and being integral therewith and said annular conic wall of said concave element, said fingers being arranged in a plurality of rows circumferentially spaced from one another, a first of said rows being positioned adjacent the zone of merger of said body portion with said annular conic wall, said fingers of said first row having one side shorter than another side thereof, a second of said rows being positioned adjacent said zone of merger of said conic wall opposite said first row, said fingers of said second row having one side shorter than another side thereof, a third of said rows being positioned within and being integral with said zone of merger, said fingers of said third row having equal sides, said fingers of said first and second rows being generally aligned radially with respect to said body portion and said conic wall and said fingers of said third row being misaligned with respect to said fingers of said first and second rows.
Claim 3
Dependent Claim
51 words
The structure of claim 1 further characterized in that said annular conic wall includes a row of fingers integral with said annular conic wall and arranged circumferentially on a side of said conic wall opposite the side forming said concave element and adjacent its distal end from said zone of merger.
References Cited (Backward Citations)
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Cited
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US2931311A
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US3135173A
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US3183789A
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US3435734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |