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Door keyhole (or known as escutcheon tube[1]) is an elevator device used to unlock the landing doors interlock in elevator maintenance or in the event of an emergency like entrapment, and it can only be done by an elevator engineer and the firefighters[2].

Most elevators have their door keyhole located on one door panel and aligned to the edge of the door, while some others may be located on the upper door jamb (like modern day Schindler (mainly Sematic Group), Kone (including Wittur Group) and thyssenkrupp elevators). Some of them maybe only available in the highest or lowest landings.

Different elevator manufacturers have their own keyhole type. Except all are triangle-shaped or drop key for some country code[2].

This information is for educational purposes only. DO NOT enter elevator shafts unless you are the skilled elevator technicians or you have permission from an elevator technician. This may illegal for some country code if you unauthorized enter the elevator shafts and considered as interfere the operation of the elevators[2].

List of door keyhole shape by elevator manufacturers

This list is for the automatic doors only, and the manual doors are not included.
  • Doors open requires a key - used in older Sabiem elevators[2].
  • Doors open requires a "fork" - used in older Fujitec elevators on or before early 1980s[2].
  • C-shaped - used in 1980s and sometimes 1990s Hyundai elevators.
  • L-shaped - used in most Sigma (before 2012)[2] and LG-OTIS elevators (from 2000 to 2005).
  • S-shaped - used in some 1970s Mitsubishi elevators[2].
  • T-shaped - used in most Mitsubishi elevators from the 1970s to present day[2].
  • U-shaped - used in older Express Lift (or GAL), American Schindler and GEC-branded elevators.
  • Square U-Shaped - Used in O&K and Keighley lifts in the UK, and very few 1990s LG elevators.
  • V-shaped - used in some 1960s and 1970s Otis elevators in the UK. This keyhole has a small rectangular metal plate.

List of standard escutcheon key

Drop key

Drop key is one of the industrial standard escutcheon key in North America, also used for some older used in some 1960s and 1970s Otis and Toshiba elevators in Hong Kong, China before the standardized triangle-shaped escutcheon key established[2].

Triangle-shaped

Triangle-shaped escutcheon key is a industrial standard in Hong Kong, China since late-1970s[3], with its standardized size[2]. This is now the standard elevator door keyhole for many countries, including the UK and New Zealand. All Elevators in the countries that were built after a certain time are required to have triangle keyholes for all landing doors. Interestingly, however, Elevator manufacturing/maintenance companies are not required to replace the door locks/keyholes as part of modernization - even when the doors themselves are replaced.

Video

Mrmattandmrchay- Movie about lift keys especially for Urban Harvey Exploration

Mrmattandmrchay- Movie about lift keys especially for Urban Harvey Exploration

Notes and references

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