Patent US4570753A successfully refreshed from Google Patents.
US4570753A
Expired / Lapsed
US
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Elevator hoisting device
Assignee: Mitsubishi Electric Corp
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Filing: 1983-09-28
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Granted: 1986-02-18
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Expires: 2003-09-28
Abstract
Abstract An elevator hoisting device including a stator forming a primary side of a linear motor disposed on an wall of a hoistway adjacent to its ceiling, a tape-shaped amorphous metallic member for hanging down over a pulley to support at opposite ends thereof an elevator car and a counter weight so as to cause its pendent portion connected to the counter weight to be close to the stator through a non-magnetic member with a low coefficient of friction to form a secondary conductor of the linear motor. The non-magnetic member and therefore the adjacent surface of the stator is somewhat tilted to the vertical downward toward the wall of the hoistway.
Inventors
- 👤 Kazutoshi Ohta
- 👤 Katsuhiko Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:44
CPC Classifications
B; B66; B66B; B66B11/00; B66B11/04; B66B11/0407
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
275 words
An elevator hoisting device, comprising a linear motor having a stator for being disposed on the side of a building and forming the primary side of said motor; an elevator car; a counterweight; at least one longitudinally extending tape-shaped metallic member, continuously flexible all along its length, connected at opposite ends thereof to said elevator car and said counterweight; and means for engaging said member intermediate said opposite ends at a location above said elevator car and said counterweight so as to vertically support said member, said elevator car and said counterweight, said member being movable longitudinally with respect to said means so as to move said elevator car and counterweight in opposite vertical directions therewith, the portion of said member between said location and said counterweight being located close to said stator so as to be vertically driven by magnetic forces from said stator, whereby said portion functions as a secondary electrical conductor of said linear motor; said elevator car and said counterweight being movable with said member between first positions in which said elevator care is adjacent said engaging means and said counterweight is substantially below said engaging means, and second positions in which said counterweight is adjacent said engaging means and said elevator car is substantially below said engaging means, said stator being located adjacent said engaging means so as to oppose said portion when said elevator car and said counterweight are in either of said first positions and said second positions; said portion of said member including a vertically extending uppermost part, said stator having a front face opposing said uppermost part and tilted downwardly and away from said uppermost part.
Claim 2
Dependent Claim
275 words
An elevator hoisting device, comprising a linear motor having a stator for being disposed on the side of a building and forming the primary side of said motor; an elevator car; a counterweight; at least one longitudinally extending tape-shaped metallic member, continuously flexible all along its length, connected at opposite ends thereof to said elevator car and said counterweight; and means for engaging said member intermediate said opposite ends at a location above said elevator car and said counterweight so as to vertically support said member, said elevator car and said counterweight, said member being movable longitudinally with respect to said means so as to move said elevator car and counterweight in opposite vertical directions therewith, the portion of said member between said location and said counterweight being located close to said stator so as to be vertically driven by magnetic forces from said stator, whereby said portion functions as a secondary electrical conductor of said linear motor; said elevator car and said counterweight being movable with said member between first positions in which said elevator care is adjacent said engaging means and said counterweight is substantially below said engaging means, and second positions in which said counterweight is adjacent said engaging means and said elevator car is substantially below said engaging means, said stator being located adjacent said engaging means so as to oppose said portion when said elevator car and said counterweight are in either of said first positions and said second positions; said portion of said member including a vertically extending uppermost part, said stator having a front face opposing said uppermost part and tilted downwardly and away from said uppermost part.
Claim 3
Dependent Claim
19 words
An elevator hoisting device as in claim 1, wherein said metallic member is formed of an amorphous metallic material.
Claim 4
Dependent Claim
34 words
An elevator hoisting devices as in claim 1, further comprising a non-magnetic member having a low coefficient of friction disposed between said stator and said portion of said metallic member close to said stator.
Claim 5
Dependent Claim
20 words
A elevator hoisting device as in claim 1, wherein said stator is located on only one side of said member.
References Cited (Backward Citations)
US2636139A
Cited
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US4217507A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |