초록 ▼

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

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.

대표청구항 ▼

[ I claim:] [1.] A vehicle brake having a brake released condition wherein the vehicle is movable and a brake applied condition wherein the vehicle is being braked against vehicle movement; said vehicle brake comprising:a magnetic latch mechanism having a magnetic array containing at least one perma

[ I claim:] [1.] A vehicle brake having a brake released condition wherein the vehicle is movable and a brake applied condition wherein the vehicle is being braked against vehicle movement; said vehicle brake comprising:a magnetic latch mechanism having a magnetic array containing at least one permanent magnet and at least one selectively energized and deenergized electromagnet and first and second oppositely-extending operating faces with friction material through which said first operating face extends to cooperatively provide a friction braking surface in a common plane therewith, said magnetic latch mechanism having alternately existing first and second latched conditions, said first latched condition being a staple latched condition existing with said at least one electromagnet deenergized and being coexistent with said brake applied condition, and said second latched condition existing with said at least one electromagnet energized and being coexistent with said brake released condition, said second latched condition having only limited stability in that it depends upon the continuous energization of said at least one electromagnet, said magnetic latch mechanism further comprising:a first member, said at least one permanent magnet and at least one electromagnet being part of said magnetic array, said magnetic array forming a part of said first member;a second member fixed to a portion of the vehicle and having said first member operatively mounted thereon in limited movable relation relative to said fixed member, said second member having a magnetically-sensitive magnetic backing plate secured thereto;a magnetically-sensitive third member with which said first and second members have relative movement, said third member having at least one friction braking surface which is selectively braked and unbraked by engagement and disengagement of said magnetic latch mechanism magnetic array friction braking surface with said third member at least one friction braking surface;said first stable latched condition of said mechanism having said magnetic array magnetically latched in braking relation to said third member by the magnetic force caused by the magnetic flux of said at least one permanent magnet with said at least one electromagnet being deenergized, establishing and maintaining said brake applied condition wherein said magnetic array friction braking surface is in braking engagement with said third member at least one friction braking surface;and said second latched condition of said mechanism having said at least one electromagnet electrically energized and producing electromagnetic flux creating electromagnetic force acting between said at least one electromagnet and said second member to move said magnetic array from its first latched condition in which it was latched in braking relation to said third member to its second latched condition in which it is latched to said second member, establishing and maintaining said brake released condition for so long as said at least one electromagnet remains energized.