US3640647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm pump
Assignee: Flexian Hydraulics Ltd
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Filing: 1970-01-29
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Granted: 1972-02-08
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Expires: 1990-01-29
Abstract
Abstract This disclosure is directed to a diaphragm pump having a crankcase housing to which there is connected a pump casing and a cooperating piston assembly. A flexible, cup-shaped diaphragm is interposed between the pump casing and the piston assembly so that a pumping chamber is formed with the pump casing on one side of the diaphragm and a pressure fluid chamber is formed on the other side of the diaphragm. A means defining a working fluid inlet and outlet is disposed in communication with the pumping chamber, and a means is provided for venting the pressure fluid chamber. In operation the action of the piston assembly on the fluid-filled pressure chamber effects the actuation of the diaphragm member to produce a pumping action on the working fluid.
Inventors
- 👤 Bernard Eaton Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F04B43/107; F04B43/086
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
316 words
A pump comprising a housing for containing a supply of pressure fluid, said housing having opposed bores, a pump assembly disposed in communication with each of said bores, each pump assembly including a cylinder block receivable in its respective bore, said cylinder block defining an open-ended cylinder having an integrally formed mounting flange, means for securing said cylinder block to said housing, a piston reciprocally mounted in each of said open-ended cylinders, a crank shaft having an eccentric thereon rotatably journaled in said housing, means operatively connecting said piston to said eccentric whereby rotation of said eccentric effects reciprocation of said piston, a pump casing having an open end and a closed end, a mounting flange circumscribing said open end, said mounting flange being contiguously disposed to the flange of said cylinder block, means for securing said pump casing flange to said cylinder block flange, an expansible tubular diaphragm extending within said pump casing, said tubular diaphragm having an open end adjacent the open end of said pump casing and an opposite closed end disposed contiguous the closed end of said pump casing, said diaphragm having a laterally extending peripheral flange adjacent the open end thereof, said diaphragm flange being clamped between the pump casing flange and the cylinder block flange, said diaphragm flange having an enlarged lip at the periphery thereof, and said cylinder block flange and pump casing flange having complementary recesses formed therein for accommodating the enlarged lip of said diaphragm flange in the assembled position, said diaphragm dividing said pump casing into an inner pressure fluid chamber, disposed in communication with said cylinder, and a pump chamber, an inlet port means and an outlet port means disposed in communication with said pump chamber, and valve means disposed in each of said inlet and outlet port means for controlling the flow of working fluid through said pump chamber when said pump is actuated.
Claim 2
Dependent Claim
316 words
A pump comprising a housing for containing a supply of pressure fluid, said housing having opposed bores, a pump assembly disposed in communication with each of said bores, each pump assembly including a cylinder block receivable in its respective bore, said cylinder block defining an open-ended cylinder having an integrally formed mounting flange, means for securing said cylinder block to said housing, a piston reciprocally mounted in each of said open-ended cylinders, a crank shaft having an eccentric thereon rotatably journaled in said housing, means operatively connecting said piston to said eccentric whereby rotation of said eccentric effects reciprocation of said piston, a pump casing having an open end and a closed end, a mounting flange circumscribing said open end, said mounting flange being contiguously disposed to the flange of said cylinder block, means for securing said pump casing flange to said cylinder block flange, an expansible tubular diaphragm extending within said pump casing, said tubular diaphragm having an open end adjacent the open end of said pump casing and an opposite closed end disposed contiguous the closed end of said pump casing, said diaphragm having a laterally extending peripheral flange adjacent the open end thereof, said diaphragm flange being clamped between the pump casing flange and the cylinder block flange, said diaphragm flange having an enlarged lip at the periphery thereof, and said cylinder block flange and pump casing flange having complementary recesses formed therein for accommodating the enlarged lip of said diaphragm flange in the assembled position, said diaphragm dividing said pump casing into an inner pressure fluid chamber, disposed in communication with said cylinder, and a pump chamber, an inlet port means and an outlet port means disposed in communication with said pump chamber, and valve means disposed in each of said inlet and outlet port means for controlling the flow of working fluid through said pump chamber when said pump is actuated.
Claim 3
Dependent Claim
38 words
The invention as defined in claim 1 wherein said cylinder has a plurality of circumferentially spaced bores in communication with the interior of said housing to enable the pressure fluid to flow from said housing to said cylinder.
Claim 4
Dependent Claim
22 words
The invention as defined in claim 1 wherein the closed end of said diaphragm engages the closed end of said pump casing.
Claim 5
Dependent Claim
46 words
The invention as defined in claim 1 and including a connecting rod operatively connected between said piston and eccentric, means for preventing radial movemenT of the connecting rod away from the eccentric, and means to prevent lengthwise movement of the connecting rod away from the eccentric.
Claim 6
Dependent Claim
33 words
The invention as defined in claim 1 wherein said valve means include a valve seat, a ball valve adapted to valve said valve seat and a valve guide for containing said ball valve.
Claim 7
Dependent Claim
19 words
The invention as defined in claim 1 wherein the body member of said diaphragm means is of nonuniform thickness.
Claim 8
Dependent Claim
63 words
The invention as defined in claim 1 wherein the internal wall of the pump casing closely surrounding the diaphragm adjacent the ends of the diaphragm and wherein the clearance between the interior of the pump casing and the diaphragm body member is such as to increase from a minimum at each end of the body member to a maximum at the midpoint thereof.
Claim 9
Dependent Claim
50 words
The invention as defined in claim 7 and including: means defining a working fluid inlet and a working fluid outlet formed in said pump casing, said fluid inlet and fluid outlet being located in the casing at the point of maximum clearance between the diaphragm body member and said casing.
Claim 10
Dependent Claim
22 words
The invention as defined in claim 1 and including means for venting the pressure fluid chamber to the exterior or the pump.
Claim 11
Dependent Claim
72 words
The invention as defined in claim 9 wherein said venting means includes a valved-through bore, a nipple adapted to be received in the exterior end of said valved-through bore whereby said nipple can be screwed into and out of said bore to close said bore when screwed thereinto a maximum extent, and to open the bore when unscrewed to some extent from the position the nipple occupied when the bore was closed.
Claim 12
Dependent Claim
19 words
The invention as defined in claim 1 wherein the material of the diaphragm consists of a flexible plasticized material.
Claim 13
Dependent Claim
16 words
The invention as defined in claim 1 wherein the material of the diaphragm consists of rubber.
Claim 14
Dependent Claim
16 words
The invention as defined in claim 1 wherein the material of the diaphragm consists of polyvinylchloride.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |