US3787148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller pump
Assignee: KOPF D SYST
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Filing: 1972-09-26
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Granted: 1974-01-22
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Expires: 1992-09-26
Abstract
Abstract A roller pump with a pair of opposed rollers which travel in a circular path concentric with a bearing surface of angular length less than 180* and squeeze a flexible tube against the bearing surface. Lead ramps extend outwardly from the ends of the bearing surface so that as one roller begins to squeeze the flexible tube, the opposite roller begins to disengage said flexible tube; thereby providing a relatively constant driving torque and smooth operation of the pump.
Inventors
- 👤 J Kopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:44
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253; F04B43/1276
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A pumping comprising, an arcuate bearing surface with an angular length less than 180*, a flexible tube carried by said bearing surface through which fluid may pass, a single pair of rollers spaced 180* apart, the axes of which travel along a circular path concentric with said bearing surface, means for moving said rollers around said circular path, means for pivotally carrying said rollers, said rollers squeezing said flexible tube surface for 180* as they travel around said circular path, and a lead ramp extending outwardly from at least one end of said bearing surface so that as one roller begins to squeeze said flexible tube, the opposite roller begins disengaging said flexible tube.
Claim 2
Dependent Claim
114 words
A pumping comprising, an arcuate bearing surface with an angular length less than 180*, a flexible tube carried by said bearing surface through which fluid may pass, a single pair of rollers spaced 180* apart, the axes of which travel along a circular path concentric with said bearing surface, means for moving said rollers around said circular path, means for pivotally carrying said rollers, said rollers squeezing said flexible tube surface for 180* as they travel around said circular path, and a lead ramp extending outwardly from at least one end of said bearing surface so that as one roller begins to squeeze said flexible tube, the opposite roller begins disengaging said flexible tube.
Claim 3
Dependent Claim
125 words
A pump comprising, an arcuate bearing surface with an angular length less than 180*, a flexible tube carried by said bearing surface through which fluid may pass, a pair of opposed rollers, the axes of which travel along a circular path concentric with said bearing surface, means for moving the axes of said rollers around said circular path, means pivotally carrying said rollers, said rollers squeezing said flexible tube against said bearing surface as they travel around said circular path, adjusting means for varying the extent to which said rollers occlude said flexible tubiNg, and lead ramps extending outwardly from each end of said bearing surface so that as one roller begins to squeeze said flexible tube, the opposite roller being disengaging said flexible tube.
Claim 4
Dependent Claim
125 words
A pump comprising, an arcuate bearing surface with an angular length less than 180*, a flexible tube carried by said bearing surface through which fluid may pass, a pair of opposed rollers, the axes of which travel along a circular path concentric with said bearing surface, means for moving the axes of said rollers around said circular path, means pivotally carrying said rollers, said rollers squeezing said flexible tube against said bearing surface as they travel around said circular path, adjusting means for varying the extent to which said rollers occlude said flexible tubiNg, and lead ramps extending outwardly from each end of said bearing surface so that as one roller begins to squeeze said flexible tube, the opposite roller being disengaging said flexible tube.
Claim 5
Dependent Claim
17 words
The device of claim 2 in which said lead ramps extend outwardly at an angle of 10*.
Claim 6
Dependent Claim
13 words
The device of claim 2 in which said bearing surface extends for 177*.
Claim 7
Dependent Claim
51 words
The device of claim 2 in which said adjusting means comprises, a pivotable slot cam positioned between said rollers, a follower extending from each roller carrier into the slot of said slot cam, and means for angularly displacing said slot cam to selectively position said rollers relative to said flexible tubing.
Claim 8
Dependent Claim
18 words
The device of claim 5 further comprising locking means for locking said slot cam in a selected position.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |