Preventing faulty operation of elevator car door

A signal generation and door control arrangement, comprising:

• a control means for receiving first and second electrical signals and for generating respective first and second control signals in response to said first and second electrical signals;
• an elevator car having a door;
• a motor for opening said door in response to said first control signal and for closing said door in response to said second control signal, said motor being linked to said door and being connected to said control means;
• a first transmission line connected to said control means;
• a second transmission line connected to said control means, said second transmission line including a make contact which opens when said door starts closing, and cooperative first input and output terminals;
• a third transmission line connected to said first transmission line and to said second transmission line, said third transmission line being connected to said second transmission line at a point connected to said input terminal, said third transmission line including a break contact which closes when said door starts closing and cooperative second input and output terminals;
• a first switch operable by a passenger in said elevator car, in series with said first transmission line;
• a second switch operable by a passenger in said elevator car, in series with said second transmission line;
• said second switch being in series with said break contact, said second switch and said break contact being in parallel with said first switch, so that said control means receives said first electrical signal when said first switch or when said second switch is closed while said door is closing.