US 5,135,079 AGranted

Noise prevention apparatus for a cable winch elevator

AssigneeKabushiki Kaisha Toshiba

InventorToshio Shimazaki

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Abstract

A cable winch elevator noise prevention apparatus is provided with a winch on the top most floor of a building and having a main sheave that winds a cable up and down, to both ends of which are fixed an elevator cage and a counterweight, and at least two cable holes opened in a floor of a machine room on the topmost floor where the winch is installed, and so as to allow the cable wound around the main sheave to pass through and move freely up and down. This apparatus is provided with a vibration detector to detect vibration which is mounted in the vicinity of a vibration noise source inside the machine room that includes the winch, a noise predictor circuit that uses the vibration detected by the detector to predict the phase and the frequency of vibration noise that leaks from the cable holes to an elevator hoistway, a sound signal generator circuit that generates noise cancellation sound signals having a phase opposite to a phase of a noise waveform predicted by the predictor circuit, and a cancellation sound generator circuit provided in the vicinity of the cable holes that converts into actual sounds the sound signals of noise cancellation sounds having the opposite phase to the noise which have been generated by the generator circuit.

Claims10

Dependent claims

A cable winch elevator noise prevention apparatus provided with a winch on the topmost floor of a building and having a main sheave that winds a cable up and down, to both ends of said cable are fixed an elevator cage and a counterweight, and at least two cable holes opened in a floor of a machine room on said topmost floor where said winch is installed, so as to allow said cable wound around said main sheave to pass through and move freely up and down, and characterized in being provided with:

vibration detection means for detecting vibration noise, said vibration detection means being mounted in the vicinity of a vibration noise source inside said machine room including said winch,
noise prediction means for using said vibration noise detected by said detection means to predict phase and frequency of vibration noise leaking from said cable holes to an elevator hoistway as a noise waveform;
audio signal generation means for generating noise cancellation sound signals having an opposite phase to a phase of said noise waveform predicted by said prediction means, and
cancellation sound generation means located in the vicinity of said cable holes for converting into actual sounds said noise cancellation sounds having said opposite phase to said predicted noise waveform generated by said audio signal generation means.

1 more element

Dependencies are inferred from the claim text.