Patent ID: 8875846

Claim:
A speed limiter for an elevator installation, comprising: a speed limiter wheel with a first cam disc having a first control cam with lobes and with a second cam disc having a second control cam with lobes; a first mass which rolls by a first roller on the first control cam so that the first mass describes a first oscillatory motion during rotations of the speed limiter wheel; a second mass which rolls by a second roller on the second control cam so that the second mass describes a second oscillatory motion during rotations of the speed limiter wheel, wherein there is a phase displacement between the first control cam and the second control cam for reducing vibration in the speed limiter; and wherein the first mass on reaching a first excess speed actuates a first mechanism for advance switching-off of a drive of the elevator installation and on reaching a second, higher excess speed the second mass triggers a second mechanism for actuation of at least one safety brake device for an elevator car of the elevator installation.