Lock with a long-travel deadbolt

A lock with a long-travel deadbolt, comprising:

• a case (1) having a core recess (17) and a deadbolt recess (15), the core recess (17) including a first guide member (178) and defining a loop-shaped rail (R);
• a driving member (5) having an end fixed to a deadbolt (8) which is movably in the deadbolt recess (15), the driving member (5) having a slide slot (51) in which the first guide member (178) is slidably received therein, the driving member (5) having a second guide member (52) on an end face thereof, a third notch (55) defined in an bottom of the driving member (5) and located at the rail (R);
• an extension plate (6) having an end thereof eccentrically and pivotably connected to the second guide member (52), the extension plate (6) including an extension slot (61) which extends toward two opposite extension directions which are located corresponding to the slide slot (51), an intermediate point (63) formed at a turning position of the two opposite extension directions, the first guide member (178) slidable within the extension slot (61), and
• when in an unlock position, the deadbolt (8) is located in the deadbolt recess (15) and the first guide member (178) is located at one inner end of the slide slot (51) and the extension slot (61), when in a middle position, the first guide member (178) is located at the intermediate point (63) and the deadbolt (8) partially protrudes from the deadbolt recess (15), the extension plate (6) is located at the rail (R), when in a locked position, the deadbolt (8) protrudes from the deadbolt recess (15), the extension plate (6) is in contact with the first guide member (178) so that the first guide member (178) is located at the extension slot (61) and the slide slot (51) that is located opposite to the deadbolt (8).