US3906845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump seal
Assignee: McNeil Corp
•
Filing: 1974-01-07
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Granted: 1975-09-23
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Expires: 1994-01-07
Abstract
Abstract A pump comprising a cylinder, a plunger reciprocable in the cylinder, and means for providing a seal between the plunger and the cylinder comprising an outwardly facing annular abutment in the cylinder, packing on the abutment, and a resilient elastomeric ring under compression in the cylinder forcing the packing against the abutment to cause the packing to expand radially inwardly into sealing engagement with the plunger and radially outwardly into sealing engagement with the cylinder, the elastomeric ring being sealed by the packing from the material being pumped.
Inventors
- 👤 Jerome B Wegmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:17
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/184; F16J15/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A pump comprising a cylinder, a plunger reciprocable in the cylinder, a head at one end of the cylinder having an opening for the plunger, the head having an annular shoulder facing outwardly in the opening, a bushing in the opening having its inner end spaced from the shoulder, a resilient elastomeric ring, an expandable packing ring, and a packing expanding ring between the inner end of the bushing and the shoulder, the packing expanding ring being seated on the shoulder, the packing ring engaging the packing expanding ring and being expandable radially inwardly into sealing engagement with the plunger and radially outwardly into engagement with the head by being forced against said expanding ring, and the resilient elastomeric ring being under compression between the inner end of the bushing and the packing ring to force the packing ring against said expanding ring, said resilient elastomeric ring being sealed by the packing ring from the material being pumped
Claim 2
Dependent Claim
158 words
A pump comprising a cylinder, a plunger reciprocable in the cylinder, a head at one end of the cylinder having an opening for the plunger, the head having an annular shoulder facing outwardly in the opening, a bushing in the opening having its inner end spaced from the shoulder, a resilient elastomeric ring, an expandable packing ring, and a packing expanding ring between the inner end of the bushing and the shoulder, the packing expanding ring being seated on the shoulder, the packing ring engaging the packing expanding ring and being expandable radially inwardly into sealing engagement with the plunger and radially outwardly into engagement with the head by being forced against said expanding ring, and the resilient elastomeric ring being under compression between the inner end of the bushing and the packing ring to force the packing ring against said expanding ring, said resilient elastomeric ring being sealed by the packing ring from the material being pumped
Claim 3
Dependent Claim
33 words
A pump as set forth in claim 1 wherein said packing ring expandable a cross-section excpaandalbe by wedging, and said expanding ring comprises a wedge for expanding the cross-section of the packing ring.
Claim 4
Dependent Claim
34 words
A pump as set forth in claim 2 wherein said packing ring is generally of channel shape in cross-section, having a web and lips extending from the web on opposite sides of said wedge.
Claim 5
Dependent Claim
23 words
A pump as set forth in claiM 3 having a flat ring constituting a gland between the elastomeric ring and the packing ring.
Claim 6
Dependent Claim
23 words
A pump as set forth in claim 4 wherein the bushing has an annular groove at its inner end receiving the elastomeric ring.
Claim 7
Dependent Claim
22 words
A pump as set forth is claim 5 wherein the groove is at the outside of the inner end of the bushing.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |