Abstract: The brake includes a housing for mounting and a disc assembly. The disc assembly engages a drive shaft for rotation therewith. A flange on the disc assembly receives a first ring and a second ring, each ring is slideably engaged to the flange for axial motion. Release plates adjacent to the second ring are free to move in an axial direction. A field cup has springs to bias the release plates against the second ring and o-rings to facilitate quiet operation of the elevator car brake. When no current flows through the coil, the release plates are biased against the second ring. Thus, the second ring engages the friction surface of the housing to park and hold the drive shaft. When current flows through the coil, the first and second release plates are drawn to the field cup, overcome the bias force of the springs and compress the o-rings.

Abstract: A soft action clutch uses a helical spring attached to a pulley at one end and free at the other end. In a relaxed state, preferably, the helical spring presses outwardly pushing a brake pad assembly against a fixed outer field cup braking the pulley. To serve as a clutch, a rotor has a pole face to magnetically draw the helical spring towards it. The resulting friction between the rotor and helical spring causes the spring to wrap down on a spring loaded friction disk. The wrap down compresses the friction disk radially, creating two frictional links from the friction disk to the rotor and the pulley, respectively.

Abstract: The brake includes a housing for mounting and a disc assembly. The disc assembly engages a drive shaft for rotation therewith. A flange on the disc assembly receives a first ring and a second ring, each ring is slideably engaged to the flange for axial motion. Release plates adjacent to the second ring are free to move in an axial direction. A field cup has springs to bias the release plates against the second ring and o-rings to facilitate quiet operation of the elevator car brake. When no current flows through the coil, the release plates are biased against the second ring. Thus, the second ring engages the friction surface of the housing to park and hold the drive shaft. When current flows through the coil, the first and second release plates are drawn to the field cup, overcome the bias force of the springs and compress the o-rings.

Abstract: A power-off electromechanical brake employs a friction disk compressed between a ferromagnetic clapper plate and a pressure plate. An electromagnet may pull the clapper plate away from the friction disk or the pressure plate and clapper plate may be separated by free floating spacer elements held within a rotating race positioned between the clapper plate and the pressure plate. In a first mode, cavities in the clapper plate receive spacer elements held within the race and the friction disk is compressed. In a manual release mode, the spacer elements no longer engage with the cavities and separate the pressure plate and clapper plate.