US5567876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid meters and pumps
Assignee: Elster Metering Holdings Ltd
•
Filing: 1993-09-22
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Granted: 1996-10-22
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Expires: 2013-09-22
Abstract
Abstract A volumetric water meter of the type having an eccentric piston oscillating in a cylindrical chamber has a drive peg (64) on the piston engaging a rotor arm (50) which rotates about the chamber axis to drive an external register or the like. The drive peg is offset from the piston axis by that amount necessary to compensate for the periodic variation in angular velocity of the piston. The likelihood of the peg becoming disengaged from the rotor arm is thus considerably reduced.
Inventors
- 👤 Ian J. Holmes-Higgin
- 👤 Ivor T. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
G; G01; G01F; G01F3/00; G01F3/02; G01F3/04; G01F3/06; G01F3/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A fluid device comprising a cylindrical chamber with an axis and having a fluid inlet port and a fluid outlet port; a piston eccentrically disposed within the chamber and having a cylindrical piston wall in sealing engagement with an interior surface of the chamber such that circumferential movement of the piston about said axis sweeps a fixed volume of fluid passing from the fluid inlet port to the fluid outlet port, the angular velocity of the piston in said circumferential movement varying the angle of rotation; a rotatable drive member extending outwardly of the chamber for external drive connection with the piston for communicating movement of the piston to the exterior of the chamber; and coupling means acting between the piston and the drive member, said coupling means comprising respective abutment surfaces of the piston and the drive member; wherein the point of contact between said abutment surfaces is offset radially from said axis in a direction to compensate for said variation in angular velocity.
Claim 2
Dependent Claim
165 words
A fluid device comprising a cylindrical chamber with an axis and having a fluid inlet port and a fluid outlet port; a piston eccentrically disposed within the chamber and having a cylindrical piston wall in sealing engagement with an interior surface of the chamber such that circumferential movement of the piston about said axis sweeps a fixed volume of fluid passing from the fluid inlet port to the fluid outlet port, the angular velocity of the piston in said circumferential movement varying the angle of rotation; a rotatable drive member extending outwardly of the chamber for external drive connection with the piston for communicating movement of the piston to the exterior of the chamber; and coupling means acting between the piston and the drive member, said coupling means comprising respective abutment surfaces of the piston and the drive member; wherein the point of contact between said abutment surfaces is offset radially from said axis in a direction to compensate for said variation in angular velocity.
Claim 3
Dependent Claim
49 words
A fluid device according to claim 1, wherein the abutment surface of piston is so shaped and positioned that on circumferential movement of the piston, point of said contact between the respective abutment surfaces of the coupling means follows a circular path eccentric to the axis of the chamber.
Claim 4
Dependent Claim
34 words
A fluid device according to claim 1, wherein in the abutment surface of the piston is defined by a piston drive peg which is radially offset from the cylindrical axis of the piston wall.
Claim 5
Dependent Claim
17 words
A fluid device according to any one of claims 1 to 3 comprising a flow metering device.
References Cited (Backward Citations)
US1238203A
Cited
US1973670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |