US3713601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core assembly
Assignee: COLUMBIA GREAT LAKES CORP
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Filing: 1970-04-13
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Granted: 1973-01-30
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Expires: 1990-04-13
Abstract
Abstract A hollow cylindrical fibrous core is reinforced on each end by a plastic bushing including an inner cylindrical portion having an outer diameter slightly greater than the inner diameter of the core and supporting a plurality of circumferentially spaced and axially extending teeth each of which pierces the inner surface of the fibrous core when the bushing is pressed axially into the core. The teeth have radial surfaces facing circumferentially in opposite directions to form a positive non-slip connection for driving the core assembly in either direction through one of the bushings. Each bushing also includes an outer cylindrical portion having an external diameter the same as the core and defining a plurality of slots or recesses for receiving a driving projection extending from a supporting mandrel.
Inventors
- 👤 R Buhrman
- 👤 R Hensley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:42
CPC Classifications
B; B41; B41J; B41J17/00; B41J17/22; B41J17/24; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/185
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
209 words
For use in a core assembly including an elongated tubular fibrous core, an integral plastic reinforcing bushing adapted to be mounted on an end portion of said core, said bushing comprising a generally cylindrical inner portion adapted to extend into the end portion of said core and having a diameter slightly greater than the inner diameter of the core, a generally cylindrical outer portion projecting from said inner portion and having an outer diameter greater than the outer diameter of said inner portion to define an annular shoulder for engaging the end of the core, means defining at least one recess within said outer portion of said bushing for receiving a driving projection, and a plurality of axially extending radially projecting teeth on said inner portion, said teeth including one face extending angularly from said inner portion and another face extending radially from said inner portion and intersecting said one face along a sharp edge adapted to pierce said fibrous core during insertion of said inner portion of said bushing axially into said core to form a positive driving connection between said bushing and said core, at least two of said teeth having their respective said radially extending faces oriented in opposite directions around the periphery of said bushing.
Claim 2
Dependent Claim
209 words
For use in a core assembly including an elongated tubular fibrous core, an integral plastic reinforcing bushing adapted to be mounted on an end portion of said core, said bushing comprising a generally cylindrical inner portion adapted to extend into the end portion of said core and having a diameter slightly greater than the inner diameter of the core, a generally cylindrical outer portion projecting from said inner portion and having an outer diameter greater than the outer diameter of said inner portion to define an annular shoulder for engaging the end of the core, means defining at least one recess within said outer portion of said bushing for receiving a driving projection, and a plurality of axially extending radially projecting teeth on said inner portion, said teeth including one face extending angularly from said inner portion and another face extending radially from said inner portion and intersecting said one face along a sharp edge adapted to pierce said fibrous core during insertion of said inner portion of said bushing axially into said core to form a positive driving connection between said bushing and said core, at least two of said teeth having their respective said radially extending faces oriented in opposite directions around the periphery of said bushing.
Claim 3
Dependent Claim
209 words
For use in a core assembly including an elongated tubular fibrous core, an integral plastic reinforcing bushing adapted to be mounted on an end portion of said core, said bushing comprising a generally cylindrical inner portion adapted to extend into the end portion of said core and having a diameter slightly greater than the inner diameter of the core, a generally cylindrical outer portion projecting from said inner portion and having an outer diameter greater than the outer diameter of said inner portion to define an annular shoulder for engaging the end of the core, means defining at least one recess within said outer portion of said bushing for receiving a driving projection, and a plurality of axially extending radially projecting teeth on said inner portion, said teeth including one face extending angularly from said inner portion and another face extending radially from said inner portion and intersecting said one face along a sharp edge adapted to pierce said fibrous core during insertion of said inner portion of said bushing axially into said core to form a positive driving connection between said bushing and said core, at least two of said teeth having their respective said radially extending faces oriented in opposite directions around the periphery of said bushing.
Claim 4
Dependent Claim
209 words
For use in a core assembly including an elongated tubular fibrous core, an integral plastic reinforcing bushing adapted to be mounted on an end portion of said core, said bushing comprising a generally cylindrical inner portion adapted to extend into the end portion of said core and having a diameter slightly greater than the inner diameter of the core, a generally cylindrical outer portion projecting from said inner portion and having an outer diameter greater than the outer diameter of said inner portion to define an annular shoulder for engaging the end of the core, means defining at least one recess within said outer portion of said bushing for receiving a driving projection, and a plurality of axially extending radially projecting teeth on said inner portion, said teeth including one face extending angularly from said inner portion and another face extending radially from said inner portion and intersecting said one face along a sharp edge adapted to pierce said fibrous core during insertion of said inner portion of said bushing axially into said core to form a positive driving connection between said bushing and said core, at least two of said teeth having their respective said radially extending faces oriented in opposite directions around the periphery of said bushing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |