US4934227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cutting a support helix for a radially expanded resilient sleeve
Assignee: 3M Co
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Filing: 1989-04-13
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Granted: 1990-06-19
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Expires: 2009-04-13
Abstract
Abstract A device for cutting a support helix for a radially expanded sleeve of resilient material which may be used as an enclosure of an elongate object such as an electrical cable. The device includes a knife wheel having a plurality of circumferentially distributed, radially projecting knives for making elongate spaced cuts through the wall of a plastic tube. The plastic tube and the knife wheel are rotated and moved axially relative to each other to cause the knife wheel to make a helical pattern of elongate spaced cuts through the wall of the plastic tube along the entire length of the plastic tube. One end portion of the helix is separated from the helix into a strip extending from one end of the helix through the support helix and out of the other end thereof where it may be manually grasped. The connection areas between the spaced cuts are dimensioned so that the support helix can be manually unwound by pulling on the end portion extending through the support helix.
Inventors
- 👤 Winfried Knorr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/065; H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/192; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/14; B26D1/157; B26D1/18; B26D7/00; B26D7/01; B26F; B26F1/00; B26F1/0015; B26F1/0023; B26F1/0061; B26F1/0076; B26F1/18; B26F1/20; H02G1/00; H02G1/14; H02G15/182; H02G15/1826; H02G15/1833; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53657; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1352; Y10T428/139; Y10T82/00; Y10T82/10; Y10T82/16; Y10T82/16426; Y10T82/16803; Y10T82/16819; Y10T82/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
233 words
A device for cutting a removable support helix for a radially expanded sleeve of resilient material from a plastic tube, comprising: a knife wheel having a plurality of circumferentially distributed, radially projecting knives, said knives having circumferentially extended blades for making elongate spaced cuts through the wall of the plastic tube, means for supporting the plastic tube with its axis generally parallel to the axis of said knife wheel for being cut by said knife wheel, means supporting said knife wheel for rotation about its axis and for pressing said blades of said knife wheel against the exterior surface of the plastic tube supported by said means for supporting the plastic tube to cause said blades to cut through the wall of the plastic tube upon relative rotation between said knife wheel and the plastic tube, means for producing relative rotation between the plastic tube supported by said means for supporting the plastic tube and said knife wheel to cause said blades to cut through the wall of the plastic tube, and means for producing relative axial translational movement between said knife wheel and the plastic tube supported for cutting as relative rotation is produced between the supported plastic tube and said knife wheel to cause said knife wheel to make a helical pattern of elongate spaced cuts through the wall of the plastic tube along the entire length of the plastic tube.
Claim 2
Independent Claim
233 words
A device for cutting a removable support helix for a radially expanded sleeve of resilient material from a plastic tube, comprising: a knife wheel having a plurality of circumferentially distributed, radially projecting knives, said knives having circumferentially extended blades for making elongate spaced cuts through the wall of the plastic tube, means for supporting the plastic tube with its axis generally parallel to the axis of said knife wheel for being cut by said knife wheel, means supporting said knife wheel for rotation about its axis and for pressing said blades of said knife wheel against the exterior surface of the plastic tube supported by said means for supporting the plastic tube to cause said blades to cut through the wall of the plastic tube upon relative rotation between said knife wheel and the plastic tube, means for producing relative rotation between the plastic tube supported by said means for supporting the plastic tube and said knife wheel to cause said blades to cut through the wall of the plastic tube, and means for producing relative axial translational movement between said knife wheel and the plastic tube supported for cutting as relative rotation is produced between the supported plastic tube and said knife wheel to cause said knife wheel to make a helical pattern of elongate spaced cuts through the wall of the plastic tube along the entire length of the plastic tube.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein said knives have lateral faces that extend generally radially and merge towards said circumferential blade to form lateral blades.
Claim 4
Dependent Claim
16 words
The device of claim 2 wherein the lateral faces of said knives have a convex curvature.
Claim 5
Dependent Claim
15 words
The device of claim 1 wherein said knives have a hollow grinding on both sides.
Claim 6
Dependent Claim
26 words
The device of claim 1 wherein a guide is provided for the axial advancement of the supported plastic tube and said knife wheel is rotatably driven.
Claim 7
Dependent Claim
26 words
The device of claim 5 wherein said knife wheel is supported for engagement into and cutting along a helical peripheral groove in the supported plastic tube.
Claim 8
Dependent Claim
66 words
The device of claim 1 wherein said means for supporting a plastic tube includes a counter wheel constructed and supported for engaging the inside surface of the wall of a plastic tube in an area disposed opposite said knife wheel, said counter wheel having a circumferential recess in its periphery for receiving the outer ends of said knives penetrating through the wall of the plastic tube.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |