https://www.google.com/search?q=coffin+bell&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiGi9-L94DcAhUEq1MKHZQNAUsQ_AUICygC&biw=1536&bih=732#imgrc=wY-VwBn4ohDupM:&spf=1530552136224
And thus the phrase ‘Saved by the bell’......................