US3916763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming slits in tubes
Assignee: Individual
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Filing: 1974-05-29
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Granted: 1975-11-04
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Expires: 1994-05-29
Abstract
Abstract A tube is slit or slotted for use as an irrigation pipe, for example, by intermittently feeding the tube through a slitting station in a stepwise manner and moving a plurality of rotating cutting blades which encircle the path of travel of the tube into cutting engagement with the tube between successive stepwise movements thereof. The apparatus includes a pair of rotary feed members which engage portions of the tube closely adjacent sets of rotary cutting blades arranged around the path of travel of the tube. Means are provided for operating the rotary feed members to impart the stepwise movement to the tube in timed relation to inward and outward movements of the cutting blades, and means are provided for encirclingly restricting the tube against any substantial displacement by the cutting blades during their movement into cutting engagement with the tube.
Inventors
- 👤 Ernest J Maroschak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:37
CPC Classifications
B; B23; B23D; B23D45/00; B23D45/12; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/156; B21C37/157; B23C; B23C3/00; B23C3/28; B23C3/34; Y; Y10; Y10T; Y10T409/00; Y10T409/30; Y10T409/304536; Y10T409/305208; Y10T409/306048; Y10T409/306664; Y10T409/307784; Y10T83/00; Y10T83/04; Y10T83/0596; Y10T83/444; Y10T83/463; Y10T83/4635; Y10T83/727; Y10T83/739; Y10T83/768; Y10T83/7755; Y10T83/7788
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
409 words
Apparatus for forming slits in a corrugated tube having annular corrugations of alternating ribs and valleys thereon, said apparatus comprising a slitting station having a plurality of normally inactive cutting blades, said slitting station also having means for feeding the corrugated tube therethrough comprising a rotary feed gear having peripheral teeth thereon adapted to successively enter successive valleys of the tube and to push forwardly against respective ribs of the tube during forward rotation of said feed gear, drive means for continuously rotating said feed gear forwardly at a predetermined peripheral speed, means operatively associated with said feed gear for stopping the tube at predetermined intervals of predetermined duration and comprising means operatively associated with said drive means for repeatedly imparting rearward translational movement and then forward translational movement to the feed gear with the rate of rearward translational movement of the feed gear being correlated to the rate of forward rotation thereof so that the tube dwells throughout the rearward translational movement thereof and so that the feed gear moves the tube forwardly at a rate equal to the rate of rotation of the feed gear combined with the rate of forward translational movement of the feed gear during each successive forward translational movement of the feed gear, means automatically operable during the course of each successive rearward translational movement of said feed gear for activating said cutting blades and moving the same into cutting engagement with the tube each time the tube dwells in its course through the slitting station, and an elongate tubular guide member extending through said slitting station and defining an encircling restricting passageway for directing the corrugated tube past said cutting blades and into meshing engagement with said feed gear, said tubular guide member having one end thereof positioned immediately adjacent to said cutting blades but out of cutting engagement therewith and serving for preventing any substantial displacement of the tube by said cutting blades during their movement into cutting engagement with the tube, and said tubular guide member having an elongate opening in the wall thereof adjacent to said feed gear through which the peripheral teeth of the feed gear extend for meshingly engaging with the corrugated tube and feeding the same through the slitting station while the tubular guide member prevents any substantial displacement of the tube by the feed gear during said forward and rearward translational movement of the feed gear during feeding of the tube through the slitting station.
Claim 2
Dependent Claim
409 words
Apparatus for forming slits in a corrugated tube having annular corrugations of alternating ribs and valleys thereon, said apparatus comprising a slitting station having a plurality of normally inactive cutting blades, said slitting station also having means for feeding the corrugated tube therethrough comprising a rotary feed gear having peripheral teeth thereon adapted to successively enter successive valleys of the tube and to push forwardly against respective ribs of the tube during forward rotation of said feed gear, drive means for continuously rotating said feed gear forwardly at a predetermined peripheral speed, means operatively associated with said feed gear for stopping the tube at predetermined intervals of predetermined duration and comprising means operatively associated with said drive means for repeatedly imparting rearward translational movement and then forward translational movement to the feed gear with the rate of rearward translational movement of the feed gear being correlated to the rate of forward rotation thereof so that the tube dwells throughout the rearward translational movement thereof and so that the feed gear moves the tube forwardly at a rate equal to the rate of rotation of the feed gear combined with the rate of forward translational movement of the feed gear during each successive forward translational movement of the feed gear, means automatically operable during the course of each successive rearward translational movement of said feed gear for activating said cutting blades and moving the same into cutting engagement with the tube each time the tube dwells in its course through the slitting station, and an elongate tubular guide member extending through said slitting station and defining an encircling restricting passageway for directing the corrugated tube past said cutting blades and into meshing engagement with said feed gear, said tubular guide member having one end thereof positioned immediately adjacent to said cutting blades but out of cutting engagement therewith and serving for preventing any substantial displacement of the tube by said cutting blades during their movement into cutting engagement with the tube, and said tubular guide member having an elongate opening in the wall thereof adjacent to said feed gear through which the peripheral teeth of the feed gear extend for meshingly engaging with the corrugated tube and feeding the same through the slitting station while the tubular guide member prevents any substantial displacement of the tube by the feed gear during said forward and rearward translational movement of the feed gear during feeding of the tube through the slitting station.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |