Patent US3818807A successfully refreshed from Google Patents.
US3818807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry pump piston seal
Assignee: Engineered Concrete Placer Inc
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Filing: 1972-12-06
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Granted: 1974-06-25
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Expires: 1992-12-06
Abstract
Abstract In a slurry pump pumping cylinder, a system for liquid-sealing of the pumping cylinder head with respect to the interior walls of the pumping cylinder. Particularly, a pair of spaced apart resilient rings peripherally encircling the pumping head, a annular sealing recess intermediate the rings and a source of liquid pumping sealant continuously supplied to the annular liquid recess by means of a conduit extending reciprocably within the pumping cylinder.
Inventors
- 👤 C Semple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:05
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/143
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A slurry pump assembly comprising: A. a pumping cylinder having an inner and outer wall; B. a pump piston including a piston head and an axially extending rod reciprocably positioned within said cylinder, said head further including: i. longitudinally spaced apart peripherally extending seals in contact with the inner wall of said pumping cylinder and a peripheral sealing recess defined intermediate said seals; C. a sealant liquid supply conduit supported in said chamber and connected to said peripheral sealing recess and to an external source of liquid sealant; D. a radially extending swivel rotatably mounted upon said piston axially extending rod and adjacent said piston head and supporting said sealant liquid supply conduit; and E. a piston adaptor mounted upon said piston head and said rod intermediate said swivel and said piston head and including an internal conduit interconnecting a piston channel means connected to said peripheral sealant recess and said sealant liquid supply conduit extending into said swivel.
Claim 2
Dependent Claim
159 words
A slurry pump assembly comprising: A. a pumping cylinder having an inner and outer wall; B. a pump piston including a piston head and an axially extending rod reciprocably positioned within said cylinder, said head further including: i. longitudinally spaced apart peripherally extending seals in contact with the inner wall of said pumping cylinder and a peripheral sealing recess defined intermediate said seals; C. a sealant liquid supply conduit supported in said chamber and connected to said peripheral sealing recess and to an external source of liquid sealant; D. a radially extending swivel rotatably mounted upon said piston axially extending rod and adjacent said piston head and supporting said sealant liquid supply conduit; and E. a piston adaptor mounted upon said piston head and said rod intermediate said swivel and said piston head and including an internal conduit interconnecting a piston channel means connected to said peripheral sealant recess and said sealant liquid supply conduit extending into said swivel.
Claim 3
Dependent Claim
27 words
A slurry pump assembly as in claim 1, said piston head, piston rod and piston adaptor being rotatable with respect to said swivel and within said chamber.
Claim 4
Dependent Claim
28 words
A slurry pump assembly as in claim 2, said swivel extending radially away from said rod and being reciprocable together with said rod and said liquid supply conduit.
Claim 5
Dependent Claim
32 words
A slurry pump assembly as in clAim 3, including a pumping cylinder head, said liquid supply conduit extending through said pumping cylinder head and being reciprocable axially together with said piston rod.
Claim 6
Dependent Claim
23 words
A slurry pump assembly as in claim 4, including an inner liquid tube leading from said liquid sealant into said liquid supply conduit.
Claim 7
Dependent Claim
34 words
A slurry pump assembly as in claim 5, including guide bushing means mounted on said pumping cylinder head and guiding said sealant liquid supply conduit at its point of entry into said pumping cylinder.
Claim 8
Dependent Claim
24 words
A slurry pump assembly as in claim 5, said swivel including an independent pipe plug communicating with said liquid supply conduit and internal conduit.
Claim 9
Dependent Claim
27 words
A slurry pump assembly as in claim 7, said swivel being secured on said piston rod by a lock ring encircling said rod and abutting said swivel.
Claim 10
Dependent Claim
35 words
A slurry pump assembly as in claim 8, said spaced apart peripheral seals including an O-ring at the forward end of said piston head and a resilient seal at the trailing edge of said head.
Claim 11
Dependent Claim
39 words
A slurry pump assembly as in claim 9, said piston head channel means including an axial sealant conduit passage communicating with a corresponding passage in said adaptor and including a channel portion leading radially to said peripheral sealant recess.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |