US3565298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-dispensing device
Assignee: Individual
•
Filing: 1969-01-08
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Granted: 1971-02-23
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Expires: 1989-01-08
Abstract
Abstract A device for repeatedly dispensing a predetermined quantity of liquid. A reciprocating piston pump has poppet-type intake and delivery valves which are actuated by the drive mechanism of the pump piston to open and close intake and delivery passages in synchronism with the pump strokes. An imperforate flexible diaphragm is interposed between the valve poppets and the valve seats to prevent the liquid from contacting the valve poppets. The piston drive mechanism includes a variable first lost-motion connection providing for an abrupt discontinuance of the pump strokes and a second lost-motion connection providing for a rest period of the pump piston at the end of the delivery stroke to permit the intake and delivery valves to be opened and closed with no flow taking place in the intake and delivery passages.
Inventors
- 👤 Lars Erik Ohlin
- 👤 Gosta Carlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
F; F04; F04B; F04B7/00; F04B7/0042; F04B7/0053; F04B53/00; F04B53/14; F04B9/00; F04B9/02; F04B9/04; F04B9/042
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
A device for repeatedly dispensing a predetermined quantity of liquid comprising: a reciprocating pump having a pump cylinder providing a variable volume pump chamber and a reciprocable piston in said pump cylinder; a first valve block having intake and delivery passages therein communicating with said pump chamber, said passages including intake and delivery valve seats provided in an external surface of said first valve block; a flexible imperforate diaphragm positioned on said external surface of said first valve block to overlie said valve seats and sealingly engage portions of said external surface surrounding said valve seats; a second valve block positioned on said flexible diaphragm; poppet-type intake and delivery valve members in said second valve block, said valve members being adapted to act on said flexible diaphragm on the side thereof facing said second valve block, thereby to cause said flexible diaphragm to engage said valve seats to close said passages; and valve-actuating means for displacing said valve members towards and away from said valve seats.
Claim 2
Independent Claim
166 words
A device for repeatedly dispensing a predetermined quantity of liquid comprising: a reciprocating pump having a pump cylinder providing a variable volume pump chamber and a reciprocable piston in said pump cylinder; a first valve block having intake and delivery passages therein communicating with said pump chamber, said passages including intake and delivery valve seats provided in an external surface of said first valve block; a flexible imperforate diaphragm positioned on said external surface of said first valve block to overlie said valve seats and sealingly engage portions of said external surface surrounding said valve seats; a second valve block positioned on said flexible diaphragm; poppet-type intake and delivery valve members in said second valve block, said valve members being adapted to act on said flexible diaphragm on the side thereof facing said second valve block, thereby to cause said flexible diaphragm to engage said valve seats to close said passages; and valve-actuating means for displacing said valve members towards and away from said valve seats.
Claim 3
Dependent Claim
17 words
A device according to claim 1, wherein said intake valve member is secured to said flexible diaphragm.
Claim 4
Dependent Claim
17 words
A device according to claim 1, wherein said delivery valve member is biased towards said fleXible diaphragm.
Claim 5
Dependent Claim
47 words
A device according to claim 3, including an actuating lever for said valve members, said actuating lever being pivoted to said valve members at spaced points and biased to keep said intake valve member in a closed position and said delivery valve member in an open position.
Claim 6
Dependent Claim
70 words
A device according to claim 4, including means for operatively connecting said actuating lever with a rotatable cam disc having an eccentrically positioned driver pin and a reciprocable slide operatively connected with said piston to reciprocate it in said pump cylinder, said slide having a slot-and-pin connection with said cam disc including a slot extending transversely of the direction of reciprocation of said slide and engaging over said driver pin.
Claim 7
Dependent Claim
75 words
A device according to claim 5, wherein means is provided for continuously rotating said cam disc and driver pin during the course of a dispensing cycle comprising an intake and a delivery stroke of said piston and wherein said slot-and-pin connection between said cam disc and said slide plate includes lost-motion means for effecting an abrupt discontinuance of said delivery stroke and a rest period of said piston between said delivery and said intake strokes.
Claim 8
Dependent Claim
49 words
A device according to claim 5, wherein said slide is operatively connected with said piston between two adjustably spaced abutments on a piston rod of said piston by lost-motion means permitting said slide to move relative to said piston a distance substantially corresponding to the spacing of said abutments.
Claim 9
Dependent Claim
26 words
A device according to claim 7, wherein said lost-motion means includes resilient means permitting slight overtravel of said slide past the end positions of said piston.
Claim 10
Dependent Claim
71 words
A device according to claim 8, wherein means is provided for continuously rotating said cam disc and driver pin during the course of a dispensing cycle comprising an intake and a delivery stroke of said piston and wherein said slot-and-pin connection between said cam disc and said slide plate includes second lost-motion means for effecting an abrupt discontinuance of the movement of said slide at the end of said delivery stroke.
Claim 11
Dependent Claim
20 words
A device according to claim 1, including drive means for reciprocating said piston and connected to actuate said valve-actuating means.
Claim 12
Dependent Claim
21 words
A device according to claim 1, in which said pump cylinder and said piston cooperate to provide said variable pump chamber.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |