Patent US3773185A successfully refreshed from Google Patents.
US3773185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible magnet yoke for a crane
Assignee: United States Steel Corp
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Filing: 1970-05-22
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Granted: 1973-11-20
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Expires: 1990-05-22
Abstract
Abstract A crane having a pair of trolleys supported on its bridge and a mast dependent from each trolley has a support pivotally mounted on the mast for movement about a horizontal axis. A suspension bar is pivotally mounted on each end of the support for movement about an axis parallel to the support axis. A magnet is suspended from each of the suspension bars by means of a resilient support at each end of the bar. Thus, when an elongated object is picked up by the four magnets good contact is made by all four magnets.
Inventors
- 👤 A Johnson
- 👤 H Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:07
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/04; B66C13/00; B66C2700/00; B66C2700/01; B66C2700/012; B66C2700/017
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
A crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspension bar, a hanger bolt extending through each sleeve with a space between the hanger bolt and the sleeve, a plate surrounding each hanger bolt above the top of said suspension bar, springs bearing against the bottom of said plate biasing said hanger bolt upwardly, a magnet associated with each suspension bar, a clevis attached to each end of the associated magnet, and a pivot pin connecting the bottom end of each hanger bolt to the associated magnet, the axis of said pivot pin being normal to the vertical plane through the axis of the suspension bar.
Claim 2
Dependent Claim
200 words
A crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspension bar, a hanger bolt extending through each sleeve with a space between the hanger bolt and the sleeve, a plate surrounding each hanger bolt above the top of said suspension bar, springs bearing against the bottom of said plate biasing said hanger bolt upwardly, a magnet associated with each suspension bar, a clevis attached to each end of the associated magnet, and a pivot pin connecting the bottom end of each hanger bolt to the associated magnet, the axis of said pivot pin being normal to the vertical plane through the axis of the suspension bar.
Claim 3
Dependent Claim
60 words
A crane according to claim 1 including a crane bridge, a pair of trolleys supported on said bridge for movement therealong, means supporting said mast on one of said trolleys for vertical movement, a second mast having an associated structure similar to said first mast, and means supporting said second mast on the other of said trolleys for vertical movement.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |