Magnetic latch mechanism and method particularly for linear and rotatable brakes
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United States of America Patent
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-
Aug 11, 1998
Issued Date -
N/A
app pub date -
Dec 9, 1996
filing date -
May 25, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Latching mono-stable brakes which are held disengaged from braking surfaces by the energization of electromagnets, and are engaged with the braking surfaces by deenergization of the electromagnets and the magnetic forces of permanent magnets. The brakes are particularly applicable to linear braking in such vehicles as elevators, trains, trams, cable cars and the like. They may also be applicable to vehicle brakes which act on rotating braking surfaces. They may be actuated in response to excessive speed, particularly when installed in vehicles such as elevators. They may be unlatched as needed by reenergization of the electromagnets. Various features of such brake mechanisms are disclosed, including guided mountings; scissors-like mountings; combined mechanical servo and magnetic actions; multi-brake equalization mechanism; pivotally mounted actuation and release brake units; braking action on rails, rods, cables, and the like; details of magnetic pole piece construction to accommodate various braking surfaces being engaged; elliptically shaped electromagnet windings having different numbers of layers of windings on diametrically opposite sides; magnetic flux concentrators/dispersers formed on the ends of magnet pole pieces; and other features.
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