Vibration-protected casement lock

A casement lock operable with a key or wrench, comprising:

• a lock housing having a guide slot;
• a locking core that is rotatably disposed in said lock housing, wherein said locking core carries a locking tongue that is secured to said locking core so as to rotate therewith;
• an operating shaft disposed in said lock housing, wherein said operating shaft is adapted to be engaged by a key or wrench, and wherein said operating shaft is displaceable relative to said locking core, via pressure from the key or wrench, against the force of a spring that is supported against said locking core;
• and
• an arresting pin carried by said operating shaft, wherein said arresting pin projects radially beyond a periphery of said operating shaft, wherein said arresting pin extends through an axially extending slot of said locking core, wherein said arresting extends into said guide slot of said lock housing, wherein said guide slot is provided with two axially extending arresting recesses for said arresting pin that are associated with pivot positions of said arresting pin corresponding to a locked and an unlocked position of said locking tongue, and wherein said guide slot is also provided with a circumferentially extending guide channel that communicates with said arresting recesses and corresponds to a rotational movement of said operating shaft with its arresting pin.