frame lock

Short definition from Wiktionary

Noun

1. 1
   A type of lock for a folding knife or other tool, distinct from the liner lock by the spring portion of the liner being replaced by an integral component of the handle.
2. 2
   A knife or other tool with such a lock.
3. 3
   A lock that is permanently attached to the frame of a bicycle.
4. 4
   Alternative form of frame lock.