Method and elevator

Abstract

A method for controlling movement of an elevator car (1), wherein the elevator comprises an elevator car (1) arranged to travel vertically in a hoistway (2) along at least one guide rail (3), and a suspension roping (4) for suspending the car (1) during its travel in the hoistway (2), the elevator car (1) comprising an openable door (D) in a doorway leading to the inside space of the elevator car(1) and a park brake (6) for holding the elevator car (1) immovable at a landing (L0-L3), which park brake (6) is mounted on the car (1), the method comprising driving the elevator car (1) verticallyto a landing (L0, L1, L2 or L3); and activating at least one brake (6) mounted on the car (1); and holding the car (1) immovable at the landing (L0, L1, L2 or L3) by means of the at least one brake (6) mounted on the car (1), said holding comprising compressing at least one guide rail (3) by compression members (6a, 6b) of the at least one brake (6) with a first compression force; and opening a door (D) for allowing loading and / or unloading the elevator car; maintaining a door (D) open for allowing loading and / or unloading the elevator car (1) while the car (1) is held immovable; and startingclosing movement of said door (D). The method comprises after said starting closing movement of said door (d) relieving the at least one brake (6) for allowing the elevator car (1) to start to move vertically, said relieving comprising reducing the compression force of the at least one brake (6), to be smaller than said first compression force, such that the compression members (6a, 6b) start sliding vertically against the guide rail (3); and maintaining compression with smaller compression force than said first compression force, allowing the compression members (6a, 6b) to continue to slidevertically against the guide rail (3); and thereafter removing the compression.

Description

technical field [0001] The invention relates to a method for controlling the movement of an elevator car, in particular when the elevator car is immovably parked at a landing, and to an elevator implementing the method. The elevator is preferably an elevator for vertical transport of passengers and / or goods. Background technique [0002] In elevators, suspension stay ropes comprising one or more suspension ropes are commonly used as means for suspending the elevator car. The hanging cord has at least some degree of elasticity. If not prevented, this elasticity has the potential to cause problematic car displacement during loading and unloading of the elevator car, since in these cases the rope tension changes as passengers enter and / or leave the car. Changes in tension cause changes in the length of the elastic cord, which is allowed by the cord's slight elasticity. Therefore, in a loading / unloading situation, the car may shift vertically if not prevented. In particular,...

AI Technical Summary

Problems solved by technology

[0006] Furthermore, prior art solutions are not very effective in terms of one or more of controlling the reciprocating motion of the compression member, controlling the compression force of the compression member, simplification of the structure, and compactness of the structure

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