Emergency stop button

An emergency stop button, or emergency stop switch^[1] is a button or switch used to stop an elevator, escalator or moving walkway in case of a suitable emergency.

Introduction

Elevator

These buttons/switches are used to stop the car in case of emergency or just for loading purpose, especially in service or freight elevators. Some stop switches are either flip type (like some older Mitsubishi, Hitachi and GoldStar elevators) or push-and-pull type (like most old Otis elevators). The elevator cab will not start until the button/switch/keyswitch is reset. They are normally found in older elevators installed before 1980s, and rarely found on most modern elevators nowadays, with the exception of a few countries that require them; depending on the country stop switches may even have been disconnected. Its method of implementation varies between manufacturers but often the switch breaks safety.

However, the car top, machine room, controller, shaft pit stop buttons, and the button near the ladder are still exist, to protect the elevator mechanics' safety.

Escalator or moving walkway

The escalator or moving walkway version of the buttons are placed on the both end or between (if this is long) of the escalator or moving walkway. These are the compulsory part of the escalator or moving walkway.

Function

When pressed, the elevator will stop immediately and abruptly, while escalator, or moving walkway will stop slowly to prevent the passengers getting injured^[2]. This is true even if there is otherwise nothing wrong with the elevator. On some elevators, tripping the interlocks will have the same effect.

Gallery

Notes and references

Elevator
Drive systems: Traction • Winding Drum • Hydraulic Types of elevators: Double Deck • Dumbwaiter • Fireman's • Freight • Incline • Passenger • Residential • Wheelchair lift Concept: Capacity • Destination dispatch • Elevator algorithm • Elevator control system • Elevator machine room • Elevator maintenance • Elevator monitoring system • Elevator modernization • ACOP & UCMP • Machine room less elevator • Major alterations • Rated speed Elevator systems, controllers and equipments: Elevator fixtures • Elevator keys • Elevator special modes • Elevator doors • Door cam • Door interlocks (Interlock wiring communication system) • Door restrictor • Elevator Inspection Certificate • Emergency stop button • Floor designators • Gate switch • Old Deadman controls • Overspeed governor • Motor-generator set & Silicon-controlled rectifier (for DC-powered elevators) • Insulated-gate bipolar transistor (for AC-VVVF-powered elevators) • Selector • Tape head • Regenerative converter (for AC-VVVF-powered elevators) See also: List of elevator fixtures guide • List of elevator and escalator companies • Elevator door sill guide (Non-proprietary elevator component door sill guide) • Floor numbering (Unlucky floor numbers) • Elevator incidents and accidents

Escalator and Moving Walkway
Concept: Escalator control system • Escalator machinery • Spiral escalator • Escalator maintenance • Escalator modernization • Major alterations Escalator equipments: Escalator truss and balustrade • Escalator steps and step chains • Escalator handrails • Escalator skirt brushes • Emergency stop button • Energy-saving mode See also: List of elevator and escalator companies • Escalator landing plate guide • Floor numbering (Unlucky floor numbers) • Escalator incidents and accidents

[0] Electrical and Mechanical Services Department, Hong Kong - Circular No. 12/2016 Modernization of Existing Escalators

[1] Escalator Safety Devices (Chinese version)

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