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Patent US3721394A successfully refreshed from Google Patents.
US3721394A
Expired / Lapsed
US
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Apparatus for uncoiling wire from a spool
Assignee: KM Kabelmetal AG
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Filing: 1971-06-23
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Granted: 1973-03-20
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Expires: 1991-06-23
Abstract
Abstract In an apparatus for uncoiling wire from a spool at constant speed and tension using an eddy current brake having a magnet and an electrically conductive disk for rotating in the magnetic field as provided by the magnet; for example, the magnet is mounted on a base, and the disk is or is part of the turntable supporting a spool from which wire is to be uncoiled. The turntable is axially spring biased and journalled for rotation about a vertical axis, whereby the effective air gap between the magnet and the disk is determined by resilient reaction of the spring to the weight of the spool. As wire is uncoiled, that weight decreases while the rotational speed of turntable and spool increase so that tension and withdrawal speed of the wire remain constant.
Inventors
- 👤 H Reiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:24
CPC Classifications
B; B21; B21C; B21C47/00; B21C47/34; B21C47/345; B21C47/3466; B21C47/3483; B65; B65H; B65H59/00; B65H59/02; B65H59/04; B65H59/043; B65H59/046; H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/046; B65H2555/00; B65H2555/10; B65H2555/13; B65H2555/20; B65H2555/23; H02K2213/00; H02K2213/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
238 words
In an apparatus for uncoiling wire from a spool at constant speed and tension, which includes a base, a spool support means, and journalling means on the base for journalling the support means on the base and relative to a vertical axis, comprising: an eddy current brake including magnet means and electrically conductive means, provided in spaced-apart relation on the axis with an air gap in between and further provided for relative rotation on the axis in the magnetic field as provided by the magnet means, whereby the rotation as between the magnet means and the conductive means is retarded at magnitude depending upon the distance in axial direction as between magnet means and conductive means across the air gap; one of the magnet means and of the electrically conductive means being mounted on the base, the other one of the magnet means and of the electriCally conductive means being on or a part of the spool support means; and means including resilient means for balancing the support means against the weight of the spool thereon and as journalled for rotation about the axis, so that the distance between the magnet means and the conductive means is dependent upon the resilient reaction of the resilient means to the weight of the spool, and the retarding force effective between the conductive means and the magnet means gradually diminishes as wire is uncoiled from the spool on the support means.
Claim 2
Dependent Claim
238 words
In an apparatus for uncoiling wire from a spool at constant speed and tension, which includes a base, a spool support means, and journalling means on the base for journalling the support means on the base and relative to a vertical axis, comprising: an eddy current brake including magnet means and electrically conductive means, provided in spaced-apart relation on the axis with an air gap in between and further provided for relative rotation on the axis in the magnetic field as provided by the magnet means, whereby the rotation as between the magnet means and the conductive means is retarded at magnitude depending upon the distance in axial direction as between magnet means and conductive means across the air gap; one of the magnet means and of the electrically conductive means being mounted on the base, the other one of the magnet means and of the electriCally conductive means being on or a part of the spool support means; and means including resilient means for balancing the support means against the weight of the spool thereon and as journalled for rotation about the axis, so that the distance between the magnet means and the conductive means is dependent upon the resilient reaction of the resilient means to the weight of the spool, and the retarding force effective between the conductive means and the magnet means gradually diminishes as wire is uncoiled from the spool on the support means.
Claim 3
Dependent Claim
25 words
Apparatus as in claim 1, the spool support means being a turntable serving itself as electrically conductive means, the magnet means mounted on the base.
Claim 4
Dependent Claim
13 words
Apparatus as in claim 2, the turntable being made of aluminum or copper.
Claim 5
Dependent Claim
15 words
Apparatus as in claim 1, the second means having steps for accommodating different size spools.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |