US3904326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-purpose pump
Assignee: Phoenix Pump Co
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Filing: 1973-08-13
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Granted: 1975-09-09
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Expires: 1993-08-13
Abstract
Abstract A multi-purpose pump for pumping gases and fluids such as air, water and gasoline, including a piston-cylinder combination operated by a hand-actuated handle and provided with inlet and outlet bores at the bottom of the cylinder is provided. Each bore has a check valve assembly to permit fluid to be drawn into the cylinder through the inlet bore when the piston is moved upwardly and to permit fluid to be exhausted from the cylinder through the outlet bore when the piston is moved downwardly. A disk formed integrally with the thermoplastic piston continuously engages the inner wall of the cylinder to prevent cold-flow distortion of the upper and lower sealing lips thereof when the pump is stored in the horizontal position.
Inventors
- 👤 Clyde H Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/14; F04B33/00; F04B53/00; F04B53/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
303 words
A multi-purpose pump for liquid and gaseous fluids, comprising in combination: a. a hollow, elongate cylinder having an upper end and a lower end; b. a piston fabricated from a thermoplastic material disposed transversely within said cylinder for reciprocal movement therewithin between positions proximate said upper and lower ends of said cylinder, said piston including i. a lower annular lip directed downwardly outward and having a relatively thin resilient edge in sealing engagement with the inner surface of said cylinder, ii. an upper annular lip directed upwardly outward and having a relatively thin resilient edge in sealing engagement with the inner surface of said cylinder, iii. a disc formed integrally with and disposed between said upper lip and said lower lip and having the periphery thereof continuously engaging the inner surface of said cylinder, said disc having substantial strength to support said piston when said pump is positioned horizontally for storage thereby preventing cold-flow distortion to said upper and lower lips; c. an elongate piston operating rod having the lower end thereof connected to said piston and the upper end thereof spaced above the upper end of said cylinder; d. a handle connected to the upper end of said operating ord; e. an end cap carried by the upper end of said cylinder and having an aperture therein for slidably guiding said operating rod therethrough; f. a block sealingly engaged with the lower end of said cylinder and having an inlet bore and an outlet bore, said bores communicating between the interior and exterior of said cylinder; and g. valve means associated with said inlet bores and said outlet bore to permit fluid flow through said inlet bore in response to upward movement of said piston and to permit fluid flow through said outlet bore in response to downward movement of said piston.
Claim 2
Dependent Claim
303 words
A multi-purpose pump for liquid and gaseous fluids, comprising in combination: a. a hollow, elongate cylinder having an upper end and a lower end; b. a piston fabricated from a thermoplastic material disposed transversely within said cylinder for reciprocal movement therewithin between positions proximate said upper and lower ends of said cylinder, said piston including i. a lower annular lip directed downwardly outward and having a relatively thin resilient edge in sealing engagement with the inner surface of said cylinder, ii. an upper annular lip directed upwardly outward and having a relatively thin resilient edge in sealing engagement with the inner surface of said cylinder, iii. a disc formed integrally with and disposed between said upper lip and said lower lip and having the periphery thereof continuously engaging the inner surface of said cylinder, said disc having substantial strength to support said piston when said pump is positioned horizontally for storage thereby preventing cold-flow distortion to said upper and lower lips; c. an elongate piston operating rod having the lower end thereof connected to said piston and the upper end thereof spaced above the upper end of said cylinder; d. a handle connected to the upper end of said operating ord; e. an end cap carried by the upper end of said cylinder and having an aperture therein for slidably guiding said operating rod therethrough; f. a block sealingly engaged with the lower end of said cylinder and having an inlet bore and an outlet bore, said bores communicating between the interior and exterior of said cylinder; and g. valve means associated with said inlet bores and said outlet bore to permit fluid flow through said inlet bore in response to upward movement of said piston and to permit fluid flow through said outlet bore in response to downward movement of said piston.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |