Patent US3667697A successfully refreshed from Google Patents.
US3667697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for holding a tubular core
Assignee: Novartis AG
•
Filing: 1969-12-16
•
Granted: 1972-06-06
•
Expires: 1989-12-16
Abstract
Abstract This invention relates to a mechanism for securely holding a tubular core on which a band of material such as photographic paper is to be wound. The core is held by a gripping mechanism inside a mandrel on which the core is mounted. Running through the mandrel coaxially therewith is a rotatable shaft having three rollers each mounted on a different apex of a triangular plate securely coupled to the shaft. Studs radially located within the mandrel are positioned to be engaged by the rollers so that on rotation of the shaft relative to the mandrel the studs protrude through the periphery of the mandrel to grip the core. A friction clutch between the mandrel and the shaft is provided to hold them in position after the studs have been engaged with the core.
Inventors
- 👤 Erich Binder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:17
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/587; G03B27/588; B; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/24; B65H75/242; B65H75/246; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G03B2217/00; G03B2217/26; G03B2217/261
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A core holding mechanism comprising; a rotatable shaft, a mandrel supporting thereon a cylindrical core and mounted coaxially with and rotatable relative to said shaft, clutch means frictionally coupling said mandrel to said shaft, actuating elements mounted on said shaft and rotatable therewith, and gripping means radially mounted in said mandrel and engageable by said actuating elements upon rotation of the mandrel relative to the shaft against the force of said frictional clutch means to push the gripping means radially outwards and engage the inside surface of said core thereby holding the core firmly on the mandrel so that said core rotates with said shaft.
Claim 2
Dependent Claim
105 words
A core holding mechanism comprising; a rotatable shaft, a mandrel supporting thereon a cylindrical core and mounted coaxially with and rotatable relative to said shaft, clutch means frictionally coupling said mandrel to said shaft, actuating elements mounted on said shaft and rotatable therewith, and gripping means radially mounted in said mandrel and engageable by said actuating elements upon rotation of the mandrel relative to the shaft against the force of said frictional clutch means to push the gripping means radially outwards and engage the inside surface of said core thereby holding the core firmly on the mandrel so that said core rotates with said shaft.
Claim 3
Dependent Claim
89 words
A mechanism according to claim 1 wherein said mandrel comprises a hollow cylinder, said cylinder being formed to provide a plurality of bores radially disposed about the axis of the cylinder, said gripping means comprises a plurality of studs each slidably mounted in a different one of said bores and said actuating elements comprise a plurality of rollers having their axes aligned with the axis of said shaft and positioned to engage said studs and push them radially outwards upon said relative rotation between the shaft and the mandrel.
Claim 4
Dependent Claim
42 words
A mechanism according to claim 1 wherein said clutch means comprises a friction disc mounted on one end of said mandrel and coaxial with said shaft and a braking disc secured to said shaft and in frictional contact with said friction disc.
Claim 5
Dependent Claim
47 words
A mechanism according to claim 3 including means for varying the frictional force provided by said clutch means, said frictional force varying means comprising a nut threaded on said shaft and spring means interposed between said nut and that end of said mandrel opposite said one end.
Claim 6
Dependent Claim
34 words
A mechanism according to claim 1 wherein said mandrel includes a manually operable flange for manually effecting said rotation of said mandrel relative to said shaft against the force of said frictional clutch means.
Claim 7
Dependent Claim
179 words
A mechanism according to claim 1 wherein said mandrel comprises a hollow cylinder, said cylinder being formed to provide three equiangularly spaced radial bores disposed about the axis of the cylinder and a peripherally extending recess into which said boRes open, wherein said gripping means comprises a plurality of studs each slidably mounted in a different one of said bores and an elastically deformable ring seated in said recess, and wherein said actuating elements include a triangular plate secured fast to said shaft and rollers mounted respectively on said triangular plate at each of the three different apices thereof for rotation on an axis parallel to that of said shaft, each said roller being engageable with the radially inner end of a different one of said studs for effecting radially outward displacement of said studs upon relative rotation as between said shaft and cylinder thereby to establish radially outward deformations of the corresponding peripheral portions of said elastic ring into a gripping contact with the inner surface of said core thereby to hold said core firmly on said mandrel.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |