Patent US3791659A successfully refreshed from Google Patents.
US3791659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable chuck or mandrel
Assignee: Champion International Corp
•
Filing: 1972-11-17
•
Granted: 1974-02-12
•
Expires: 1992-11-17
Abstract
Abstract An expandable chuck or mandrel is especially well suited for use in winding and machines of the sort used in paper manufacturing operations has a stepped spindle located within the borehole of the mandrel body which spindle provides tapered cam surfaces which cause the mandrel jaws to expand and contract responsive to reciprocal movement of the body of the mandrel on the spindle or vice versa.
Inventors
- 👤 W Hardin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:52
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/40; B23B31/404; B23B31/4046; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/24; B65H75/242; B65H75/248; B65H75/2484; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1037; Y10T279/1041; Y10T279/1054; Y10T279/1058; Y10T279/1083; Y10T279/19; Y10T279/1973; Y10T82/00; Y10T82/26; Y10T82/266; Y10T82/268
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
An expandable chuck or mandrel comprising a chuck body that has an external substantially cylindrical surface, has an internally stepped but substantially circular borehole that decreases in diameter as it approaches the outermost or unsupported end, has a plurality of substantially equally spaced longitudinal jaw slots interrupting said external surface and a plurality of substantially radial passages each extending from one of said slots to said borehole; each chuck jaw further having on its underside at least one recess aligned with and larger than one of said passages; a pin with an outwardly located head or enlarged end and an inner chamfered end slidably supported in each of said passages, the head being received in said jaw recess and larger than said passage, the shank extending through said passage and having a chamfered end thereon; and, a stepped spindle reciprocably mounted within said borehole having adjacent each pin chamfered end a tapered surface connected on each axial side to a cylindrical surface.
Claim 2
Dependent Claim
162 words
An expandable chuck or mandrel comprising a chuck body that has an external substantially cylindrical surface, has an internally stepped but substantially circular borehole that decreases in diameter as it approaches the outermost or unsupported end, has a plurality of substantially equally spaced longitudinal jaw slots interrupting said external surface and a plurality of substantially radial passages each extending from one of said slots to said borehole; each chuck jaw further having on its underside at least one recess aligned with and larger than one of said passages; a pin with an outwardly located head or enlarged end and an inner chamfered end slidably supported in each of said passages, the head being received in said jaw recess and larger than said passage, the shank extending through said passage and having a chamfered end thereon; and, a stepped spindle reciprocably mounted within said borehole having adjacent each pin chamfered end a tapered surface connected on each axial side to a cylindrical surface.
Claim 3
Dependent Claim
38 words
An expandable chuck according to claim 1 wherein said chuck body and said jaws have a continuous groove extending circumferentially on said external surface and overlying said passages which latter are disposed in substantially the same radial plane.
Claim 4
Dependent Claim
19 words
An expandable chuck according to claim 2 further comprising a retaining ring of resilient material is in said groove.
Claim 5
Dependent Claim
23 words
An expandable chuck according to claim 3 wherein said retaining ring is a ring of spring steel cut or split on one side.
Claim 6
Dependent Claim
25 words
An expandable chuck according to claim 4 further comprising a dowel in said groove and one side of said cut or split is supported thereagainst.
Claim 7
Dependent Claim
31 words
An expandable chuck or mandrel according to claim 1 where said chuck jaws has outer corners which have been selectively hardened by heat treatment, the entire jaw not having been hardened.
References Cited (Backward Citations)
US1919239A
Cited
US2727700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |