Escalator step buffer

Details Escalator step buffer Escalator step buffer

1989-06-19

1990-05-22

Reger, Duane A.

Brakes

Operators

Automatic

188287, 198323, B60T 1718

Patent

active

049269810

ABSTRACT:
An hydraulic buffer or brake is provided on an escalator to stop movement of the steps in case power is interrupted, or if a safety device is activated. The braking action occurs in parallel to the inclination of the step chain. The braking action occurs in several stages so that a maximum time delay between initiation of the device and stopping of the steps can be achieved. In the first stage, the braking force is more solely applied, so that the first stage can affect a stopping of an empty escalator when completed. In the second stage the braking force is more quickly applied, so that the first and second stages can affect a stopping of a heavily loaded escalator in concert in the same maximum deceleration as the first stage can, when completed stop the lightly loaded escalator.

REFERENCES:
patent: 1659968 (1928-02-01), Woodward
patent: 1695083 (1928-12-01), Blackburne
patent: 2846029 (1958-08-01), Cawley
patent: 3547236 (1970-12-01), Liesegang
patent: 4433628 (1984-02-01), Wakabayashi
patent: 4635907 (1987-01-01), Bialy et al.

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