Method and arrangement for opening and closing a suspended ceiling of an elevator car, and locking device

An arrangement to open and close a suspended ceiling of an elevator car, the arrangement comprising:

• a locking device configured to lock at least a part of the suspended ceiling in a first position, and to release at least the part of the suspended ceiling to enable at least the part of the suspended ceiling to be lowered into a second unlocked position;
• wherein
• the locking device includes pre-tuning machinery configured to pre-tune the locking device from a locking state, in which at least the art of the suspended ceiling is locked in the first position, to an unlocked state, in which at least the part of the suspended ceiling is releasable from, but held in, the first position by the locking device,
• in the unlocked state, the locking device is configured to hold at least the part of the suspended ceiling in the first position until at least the part of the suspended ceiling is released from the first position by being lifted upwards in a first direction and then lowered in a second direction, and
• after being released, at least the part of the suspended ceiling is configured to be lowered in the second direction to the second unlocked position.

A locking device comprising:

• a first portion including at least a frame part and a locking element fitted to the frame part, the locking element being configured to pivot around a joint;
• and
• a second portion configured to be locked to said first portion, the second portion including a locking part configured to be fitted to the locking element;
• wherein
• at least the locking element and the locking part form part of pre-tuning machinery configured to pre-tune the locking device into a locking state, in which at least a part of a suspended ceiling is locked in a first position, and an unlocked state, in which at least the part of the suspended ceiling is releasable from, but held in, the first position by the locking device, and
• in the unlocked state, the locking device is configured to hold at least the part of the suspended ceiling in the first position until at least the part of the suspended ceiling is released from the first position by being lifted upwards in a first direction and then lowered in a second direction to a second unlocked position.