US5495756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical chamber for liquid meter with oscillating piston
Assignee: Sappel Ste
•
Filing: 1994-06-01
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Granted: 1996-03-05
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Expires: 2014-06-01
Abstract
Abstract A cylindrical chamber (1) for an oscillating piston type of liquid counter comprises notably a biconcave fixed partition wall (9) and grooves on the lower and/or upper edges of the piston and, as the case may be, on the small cylinders of the chamber 1. The disclosure can be applied to the metering of liquid and, especially, to the metering of water.
Inventors
- 👤 Thierry Robitaille
- 👤 Fre/ de/ ric Walch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:06
CPC Classifications
G; G01; G01F; G01F3/00; G01F3/02; G01F3/04; G01F3/06; G01F3/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
227 words
In an oscillating piston type liquid meter having a cylindrical chamber, a side wall, a bottom, a lid and a fixed partition wall made of rigid material and enclosing a cylindrical piston, the piston including a vertical slot extending parallel to a cylindrical axis of the piston, the slot including two parallel slot edges defining the slot therebetween, the piston being slidably held along said fixed partition wall by the slot edges during a counting oscillation of the piston, the piston including an internal flat wall, the flat wall including an aperture having an aperture perimeter connecting to the slot edges, at least two ports being in said cylindrical chamber, wherein the profile of the fixed partition wall is a biconcave profile; wherein the improvement comprises: the biconcave profile having a shape, in cross section perpendicular to a cylindrical chamber axis, defined by the set of points C of a segment AC orthogonal to the segment AB, where A, B, C belong to the plane formed by the flat wall, A belongs to the median plane of the fixed partition wall, B belongs to the cylinder generated by the rotation of the axis of the piston, the segment AB has a length equal to the radius of the piston, and the segment AC has a length equal to at most half of the width of the slot.
Claim 2
Dependent Claim
227 words
In an oscillating piston type liquid meter having a cylindrical chamber, a side wall, a bottom, a lid and a fixed partition wall made of rigid material and enclosing a cylindrical piston, the piston including a vertical slot extending parallel to a cylindrical axis of the piston, the slot including two parallel slot edges defining the slot therebetween, the piston being slidably held along said fixed partition wall by the slot edges during a counting oscillation of the piston, the piston including an internal flat wall, the flat wall including an aperture having an aperture perimeter connecting to the slot edges, at least two ports being in said cylindrical chamber, wherein the profile of the fixed partition wall is a biconcave profile; wherein the improvement comprises: the biconcave profile having a shape, in cross section perpendicular to a cylindrical chamber axis, defined by the set of points C of a segment AC orthogonal to the segment AB, where A, B, C belong to the plane formed by the flat wall, A belongs to the median plane of the fixed partition wall, B belongs to the cylinder generated by the rotation of the axis of the piston, the segment AB has a length equal to the radius of the piston, and the segment AC has a length equal to at most half of the width of the slot.
Claim 3
Dependent Claim
23 words
The improvement according to claim 1, wherein the length of the segment AC is equal to half of the width of the slot.
Claim 4
Dependent Claim
18 words
The improvement according to claim 2, wherein the profile of the slot edges is a circular arc profile.
Claim 5
Dependent Claim
28 words
The improvement according to claim 3, wherein at least one of the edges of the piston, namely the lower edge or the upper edge, has a piston-edge groove.
Claim 6
Dependent Claim
30 words
The improvement according to claim 1, wherein the chamber has at least one small concentric cylinder and wherein the flat wall of the piston has at least one central stud.
Claim 7
Dependent Claim
41 words
The improvement according to claim 5, wherein the chamber includes at least one small cylinder supported by an end wall of the chamber and having a cylinder groove on a surface thereof, the surface being in contact with the flat wall.
Claim 8
Dependent Claim
17 words
The improvement according to claim 6, wherein the profile of the groove is a circular arc profile.
Claim 9
Dependent Claim
28 words
The improvement according to claim 5, wherein at least one of the edges of the piston, namely the lower edge or the upper edge, has a piston-edge groove.
Claim 10
Dependent Claim
41 words
The improvement according to claim 8, wherein the chamber includes at least one small cylinder supported by an end wall of the chamber and having a cylinder groove on a surface thereof, the surface being in contact with the flat wall.
Claim 11
Dependent Claim
17 words
The improvement according to claim 8, wherein the profile of the groove is a circular arc profile.
Claim 12
Dependent Claim
28 words
The improvement according to claim 1, wherein at least one of the edges of the piston, namely the lower edge or the upper edge, has a piston-edge groove.
Claim 13
Dependent Claim
41 words
The improvement according to claim 11, wherein the chamber includes at least one small cylinder supported by an end wall of the chamber and having a cylinder groove on a surface thereof, the surface being in contact with the flat wall.
Claim 14
Dependent Claim
17 words
The improvement according to claim 11, wherein the profile of the groove is a circular arc profile.
Claim 15
Dependent Claim
18 words
The improvement according to claim 1, wherein the profile of the slot edges is a circular arc profile.
Claim 16
Dependent Claim
28 words
The improvement according to claim 14, wherein at least one of the edges of the piston, namely the lower edge or the upper edge, has a piston-edge groove.
Claim 17
Dependent Claim
41 words
The improvement according to claim 15, wherein the chamber includes at least one small cylinder supported by an end wall of the chamber an having a cylinder groove on a surface thereof, the surface being in contact with the flat wall.
Claim 18
Dependent Claim
17 words
The improvement according to claim 16, wherein the profile of the groove is a circular arc profile.
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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) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |