Patent US3884598A successfully refreshed from Google Patents.
US3884598A
Expired / Lapsed
US
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Piston assembly for diaphragm pump
Assignee: Wanner Engineering Inc
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Filing: 1973-10-05
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Granted: 1975-05-20
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Expires: 1993-10-05
Abstract
Abstract A piston assembly adapted for use in a diaphragm pump of the type having a piston means movable between a first and second position, a diaphragm means movable between a first and second position, a pumping chamber disposed on one side of said diaphragm, a transfer chamber disposed on the other side of said diaphragm and means for causing reciprocation of the piston including bias means for continuously biasing said diaphragm toward the transfer chamber and valve means responsive to the relative movement between the diaphragm and the piston for controlling the flow of fluid between a fluid source and the transfer chamber such that said valve means is closed during the power stroke of the piston and such that the valve means is open during a portion of the return stroke of the piston to replenish transfer chamber fluid lost during the power stroke.
Inventors
- 👤 William F Wanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:58
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/067
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
271 words
A piston assembly for use in a diaphragm pump having a piston adapted for reciprocal movement from a first to a second position defining a power stroke and from said second to said first position defining a return stroke, a diaphragm movable between first and second positions, a pumping chamber on one side of said diaphragm, a transfer chamber on the other side of said diaphragm having a volume defined, in part, by the relative positions of said piston and said diaphragm, a source of hydraulic fluid means forming on inlet for hydraulic fluid to said transfer chamber, said fluid in said transfer chamber serving to transfer motion of said piston to said diaphragm, and means for reciprocating the piston, said piston assembly comprising: bias means movable with said piston for continuously biasing said diaphragm toward said piston; diaphragm stop means for limiting the movement of said diaphragm away from said pumping chamber, and defining the first position of said diaphragm when said diaphragm is in contact therewith; valve means responsive to relative movement between said diaphragm and said piston for controlling the flow of hydraulic fluid from said hydraulic fluid source into said transfer chamber such that said valve means is closed whenever the pressure in said transfer chamber is greater than the pressure in said hydraulic fluid source and such that Said valve means is open whenever the pressure in said transfer chamber is less than the pressure in said hydraulic fluid source and the volume of said transfer chamber is less than the volume thereof when each of said piston and said diaphragm is in its first position.
Claim 2
Dependent Claim
271 words
A piston assembly for use in a diaphragm pump having a piston adapted for reciprocal movement from a first to a second position defining a power stroke and from said second to said first position defining a return stroke, a diaphragm movable between first and second positions, a pumping chamber on one side of said diaphragm, a transfer chamber on the other side of said diaphragm having a volume defined, in part, by the relative positions of said piston and said diaphragm, a source of hydraulic fluid means forming on inlet for hydraulic fluid to said transfer chamber, said fluid in said transfer chamber serving to transfer motion of said piston to said diaphragm, and means for reciprocating the piston, said piston assembly comprising: bias means movable with said piston for continuously biasing said diaphragm toward said piston; diaphragm stop means for limiting the movement of said diaphragm away from said pumping chamber, and defining the first position of said diaphragm when said diaphragm is in contact therewith; valve means responsive to relative movement between said diaphragm and said piston for controlling the flow of hydraulic fluid from said hydraulic fluid source into said transfer chamber such that said valve means is closed whenever the pressure in said transfer chamber is greater than the pressure in said hydraulic fluid source and such that Said valve means is open whenever the pressure in said transfer chamber is less than the pressure in said hydraulic fluid source and the volume of said transfer chamber is less than the volume thereof when each of said piston and said diaphragm is in its first position.
Claim 3
Dependent Claim
38 words
The piston assembly of claim 1 wherein said piston and diaphragm are coaxial and said bias means has one end connected with said diaphragm means and the other end connected coaxially with said piston means for movement therewith.
Claim 4
Dependent Claim
14 words
The piston assembly of claim 2 wherein said bias means is a coil spring.
Claim 5
Dependent Claim
37 words
The piston assembly of claim 3 wherein said coil spring exerts a force on said diaphragm which is great enough to develop a pressure of 3 to 4 p.s.i. on the transfer chamber side of said diaphragm.
Claim 6
Dependent Claim
20 words
The piston assembly of claim 1 wherein said valve means includes a check valve means and a sliding valve means.
Claim 7
Dependent Claim
81 words
The piston assembly of claim 5 wherein said check valve means is effective to prevent flow of fluid from said hydraulic fluid source into said transfer chamber whenever the pressure in said transfer chamber is greater than the pressure in said hydraulic fluid source, and wherein said sliding valve means is open when the volume of said transfer means is less than the volume of said transfer chamber when each of said piston and said diaphragm is in its first position.
Claim 8
Dependent Claim
31 words
The piston assembly of claim 6 wherein said check valve means is effective to prevent flow of fluid from said hydraulic fluid source into said transfer chamber during said power stroke.
Claim 9
Dependent Claim
87 words
The piston assembly of claim 7 wherein said sliding valve means includes a first sleeve member connected with said piston and a second sleeve member connected with said diaphragm with one of said first and second sleeve members adapted for slidable movement within the other, each of said sleeve members including a port such taht when said ports are in communication with each other said sliding valve means is open and when said ports are not in communication with each other said sliding valve means is closed.
Claim 10
Dependent Claim
21 words
The piston assembly of claim 8 wherein said first sleeve member is adapted for slidable movement within said second sleeve member.
Claim 11
Dependent Claim
23 words
The piston assembly of claim 9 wherein said check valve means is positioned between said hydraulic fluid reservoir and said sliding valve means.
Claim 12
Dependent Claim
41 words
The piston assembly of claim 10 wherein said piston and diaphragm are coaxial and said bias means has one end connected with and moveable with said diaphragm means and the other end connected coaxially with and moveable with said piston means.
Claim 13
Dependent Claim
35 words
The piston assembly of claim 11 wherein said bias means has one end connected with and moveable with said first sleeve member and the other end connected with and moveable with said second sleeve member.
Claim 14
Dependent Claim
40 words
The piston assembly of claim 7 wherein said check valve means is a ball valve contained within said piston and movable therewith such that said ball valve tends to close by natural momentum at the beginning of each power stroke.
Claim 15
Dependent Claim
38 words
The piston assembly of claim 1 wherein said stop means limits the movement of said diaphragm near the completion of the return stroke, thereby removing pressure forces from said diaphragm and permitting said transfer chamber to be refilled.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |