spring lock

He heard the snap of the spring-lock like something bursting in his brain, and sat astonied.

This door of the ante-chamber has a spring-lock,it can easily get fast shut by the merest accident.

Says I, ''Tis a spring-lock; pull it to, and it will be fast.'

He had wrenched his key from his pocket as he tore down the street, and he jumped at the spring-lock like a demon.

Mrs. Magill, with great presence of mind, instantly shut the spring-lock door and began to walk up-stairs.