Landing door locking devices DIN EN 81-12:1999-02, section 7

摘要

The locking devices for elevator hoistway doors are of extreme significance in regard to safety technology and have been treated such ever since the advent of elevator regulations (Figure 1). Even the very earliest elevator codes contained the basic requirements for the hoistway door latch, requirements which are still valid today: The car may not move before the hoistway doors have been closed and latched (preventing pinch, shear and jamming hazard). It shall be possible to open the hoistway doors only when the car is stopped behind door (eliminating the danger of falls). The great significance in regard to safety quickly led to the realization that ting each individual installation was unsatisfactory since the test could not be based on uniform requirements and criteria and because the final evaluation was possible using the means available during on-site elevator inspections.