US4556371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant flow positive displacement pump
Assignee: FMC Technologies Inc
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Filing: 1983-07-18
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Granted: 1985-12-03
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Expires: 2003-07-18
Abstract
Abstract A triplex or quadruplex pump having pump pistons which are equally phased apart and driven by a common drive shaft so that the velocity, i.e., speed with direction of all pistons in the particular pump is equal to zero at all times.
Inventors
- 👤 Steven W. Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
F; F04; F04B; F04B11/00; F04B11/005; F04B11/0058; F04B11/0066
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
176 words
A reciprocating power pump capable of pumping a non-lubricating fluid comprising: a housing having a drive shaft rotably mounted therein; a plurality of cylinders, numbering no less than three and no more than four, each having a pumping chamber, in said housing; an intake and output manifolds common to all cylinders connected to said housing adjacent said pumping chambers; an intake check valve for each cylinder permitting flow only from said intake manifold to the associated pumping chamber; an output check valve for each cylinder permitting flow only from the associated pumping chamber to said output manifold; a plurality of external cams, equal to the number of cylinders, on said drive shaft; a roller follower engaging each cam; a piston connected to each follower and reciprocable within the associated cylinder; a seal carried by each piston and sealingly engaging the associated cylinder; said cams having identical profiles angularly spaced relative to each other; and said cams causing said pistons to reciprocate such that the sum of the velocity vectors of all pistons in equal to zero.
Claim 2
Dependent Claim
176 words
A reciprocating power pump capable of pumping a non-lubricating fluid comprising: a housing having a drive shaft rotably mounted therein; a plurality of cylinders, numbering no less than three and no more than four, each having a pumping chamber, in said housing; an intake and output manifolds common to all cylinders connected to said housing adjacent said pumping chambers; an intake check valve for each cylinder permitting flow only from said intake manifold to the associated pumping chamber; an output check valve for each cylinder permitting flow only from the associated pumping chamber to said output manifold; a plurality of external cams, equal to the number of cylinders, on said drive shaft; a roller follower engaging each cam; a piston connected to each follower and reciprocable within the associated cylinder; a seal carried by each piston and sealingly engaging the associated cylinder; said cams having identical profiles angularly spaced relative to each other; and said cams causing said pistons to reciprocate such that the sum of the velocity vectors of all pistons in equal to zero.
Claim 3
Dependent Claim
19 words
The invention according to claim 1, wherein: said plurality of cams comprises four cams angularly spaced 90 degrees apart.
Claim 4
Dependent Claim
99 words
A positive displacement triplex pump comprising: a casing having a rotatable drive shaft; three cams affixed to said drive shaft for rotation therewith; a follower engaging each of said cams; a piston connected to each follower; the cams having identical profiles angularly spaced 120° apart; each profile causing reciprocation of the associated piston with a displacement defined by a pair of equal but oppositely directed parabolas separated and interconnected by two straight lines, as representative of piston displacement when plotted on cartesian coordinates as a function of cam rotation angle, each line extending at least 60° of cam rotation.
Claim 5
Dependent Claim
99 words
A positive displacement triplex pump comprising: a casing having a rotatable drive shaft; three cams affixed to said drive shaft for rotation therewith; a follower engaging each of said cams; a piston connected to each follower; the cams having identical profiles angularly spaced 120° apart; each profile causing reciprocation of the associated piston with a displacement defined by a pair of equal but oppositely directed parabolas separated and interconnected by two straight lines, as representative of piston displacement when plotted on cartesian coordinates as a function of cam rotation angle, each line extending at least 60° of cam rotation.
Claim 6
Dependent Claim
68 words
A positive displacement triplex pump comprising: a casing having a rotatable drive shaft; three cams affixed to said shaft for rotation therewith; a follower engaging each of said cams; a piston connected to each follower; the cams having the same profiles positioned at equal angular intervals on said shaft; the profiles causing movement of said pistons so that the sum of their velocities is zero at all times.
Claim 7
Dependent Claim
68 words
A positive displacement triplex pump comprising: a casing having a rotatable drive shaft; three cams affixed to said shaft for rotation therewith; a follower engaging each of said cams; a piston connected to each follower; the cams having the same profiles positioned at equal angular intervals on said shaft; the profiles causing movement of said pistons so that the sum of their velocities is zero at all times.
Claim 8
Dependent Claim
64 words
A positive displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a piston connected to each follower; the cams having identical profiles positioned at equal angular intervals on said shaft; the profiles causing movement of said pistons so that the sum of their velocities is zero at all times.
Claim 9
Dependent Claim
64 words
A positive displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a piston connected to each follower; the cams having identical profiles positioned at equal angular intervals on said shaft; the profiles causing movement of said pistons so that the sum of their velocities is zero at all times.
Claim 10
Dependent Claim
82 words
A position displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a position connected to each follower; the cams having identical profiles angularly spaced at 90 degrees; the profile of each cam causing the associated piston to be displaced as defined by a pair of equal but oppositely directed parabolas as representative of piston displacement when plotted on cartesian coordinates as a function of cam rotation angle.
Claim 11
Dependent Claim
82 words
A position displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a position connected to each follower; the cams having identical profiles angularly spaced at 90 degrees; the profile of each cam causing the associated piston to be displaced as defined by a pair of equal but oppositely directed parabolas as representative of piston displacement when plotted on cartesian coordinates as a function of cam rotation angle.
Claim 12
Dependent Claim
65 words
A positive displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a piston connected to each follower; the cams having the same profiles equiangularly positioned on said shaft; each profile causing the movement of the associated piston so that its velocity alternately increases and decreases at a constant absolute rate.
Claim 13
Dependent Claim
65 words
A positive displacement quadruplex pump comprising: a casing having a rotatable drive shaft; four cams affixed to said shaft; a follower engaging each of said cams; a piston connected to each follower; the cams having the same profiles equiangularly positioned on said shaft; each profile causing the movement of the associated piston so that its velocity alternately increases and decreases at a constant absolute rate.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |