Why is the triangle lock a key safety component of the elevator? How is it different from ordinary door locks?- Ningbo Yinzhou Fukangda Elevator Parts Factory

The key safety role of the triangle lock

Emergency rescue and maintenance entrance

The elevator triangle lock is the only external emergency unlocking device for the elevator floor door, designed for rescue and maintenance. When the elevator fails and people are trapped, the rescuers need to open the floor door with a triangle key and confirm the location before rescue. The position of its unlocking hole is strictly limited to 2.0 meters (door leaf installation) or 2.7 meters (door frame installation) from the ground to ensure the feasibility of operation.

Prevent unauthorized opening

Unlike ordinary door locks, the triangle lock must be operated by a certified professional, and the key is marked with a "professional use" warning. Ordinary door locks (such as household latch locks) do not have this restriction, and the special nature of the triangle lock avoids accidents caused by passengers falling into the well due to misoperation.

Linkage safety device

Some new triangular locks use a linkage mechanism. When the first triangular lock is opened, the linkage striker will trigger the electrical switch to ensure that the second lock is unlocked only in a safe state, preventing maintenance personnel from entering dangerous shafts due to negligence.

Differences from ordinary door locks

Features	Triangular lock	Ordinary door lock
Design purpose	Emergency rescue, professional maintenance	Daily anti-theft or privacy protection
Unlocking method	Special triangular key, one-way rotation mechanical engagement	Universal key or password, two-way operation
Safety standards	Comply with GB/T 7588.1-2020, and require linkage with elevator control system	No specific industry regulations
Failure risk	Unauthorized opening may result in falling into a well	Usually only involves property damage
Structural complexity	Contains safety components such as linkage collision plates and limit switches	Simple structure, no additional safety mechanism

Technical specifications strengthen safety

Installation and maintenance requirements

Triangular locks need to be regularly checked for wear and tear, and the keys are kept by a dedicated person and the usage process is recorded. There is no such mandatory management requirement for ordinary door locks.

Materials and processes

Triangular locks are made of hardened steel or aluminum alloy and are resistant to high-frequency operations; ordinary locks are mostly made of copper or zinc alloy and have lower strength.