Toy libraries (Ludothek) work in the same way as book libraries. Children's toys may be checked out for weeks for a small fee. It's worth checking out the various ones close to you as some are bigger and have a larger selection of toys.
Here is a link to find the nearest Ludothek to you:
Or use the Yellow Pages http://www.directories.ch/theyellowpages/index.aspx?language=en and enter Ludotek or Ludotheques or Ludoteca as the search criteria.