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First, second and third pivotal levers are interconnected through a link mechanism in order to operate a latch mechanism which includes a latch plate and a pawl plate. When the first lever assumes its latch position and the third lever assumes its first angular position, pivoting of the second lever

First, second and third pivotal levers are interconnected through a link mechanism in order to operate a latch mechanism which includes a latch plate and a pawl plate. When the first lever assumes its latch position and the third lever assumes its first angular position, pivoting of the second lever toward its second angular position induces a pivoting movement of the first lever toward its unlatch position thereby to release the latched condition of the latch mechanism. When the first lever assumes its latch position and the third lever assumes either its second or third angular position, pivoting of the second lever toward its second angular position has no effect of the first lever thereby holding the latch mechanism in the latched condition. When the first lever assumes its unlatch position, pivoting of the second lever toward its second angular position has substantially no effect on the first lever irrespective of angular position which the third lever assumes and the third lever is prevented from assuming its third angular position.

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A lock device comprising: a case; latching means arranged in said case and having selectively latched and unlatched conditions; a first lever pivotal about a first pivot axis between its latch position taken when said latching means assumes said latched condition and its unlatched position taken whe

A lock device comprising: a case; latching means arranged in said case and having selectively latched and unlatched conditions; a first lever pivotal about a first pivot axis between its latch position taken when said latching means assumes said latched condition and its unlatched position taken when said latching means assumes said unlatched condition; a second lever pivotal about said first pivot axis between its first and second angular positions; a third lever piotal about a second pivot axis and having its first, second and third angular positions in this order; and link means comprising: first, second and third arms formed on said first lever, said first arm being linked to said latching means, said second arm having at its leading end a driven end and said third arm having at its leading end a stopper end; means defining in said second lever a generally T-shaped slot which consists of a first arcuate section, a sectoral section and a second arcuate section which are merged to form the generally T-shaped slot, said first and sectoral sections having a common arcuate edge which becomes concentric with said second pivot axis when said second lever assumes its first angular position, said second arcuate section being concentric with said first pivot axis; and a slide pin slidably received in said T-shaped slot of said second lever with its one end slidably held in an arcuate guide slot formed in said third lever, said guide slot becoming concentric with said first pivot axis when said third lever assumes its first angular position, wherein when said first lever assumes its latch position, said driven end of said second arm comes to a position near said first arcuate section of the T-shaped slot, and wherein when said first lever assumes its unlatch position, the stopper end of said third arm is exposed to said sectoral section of the T-shaped slot to contact said sectoral section so that when said first lever is in its latch position and said third lever is in its first angular position, pivoting of said second lever from its first angular position to its second angular position induces a pivoting movement of said first lever toward its unlatch position thereby releasing a latched condition of said latching means, and when said first lever is in its latch position and said third lever is in either one of its second and third angular positions, pivoting of said second lever from its first angular position to its second angular position has no effect on said first lever thereby holding said latching means in its latched condition, and when said first lever is in its unlatch position, pivoting of said second lever from its first angular position to its second angular position has substantially no effect on said first lever irrespective of angular positions which said third lever assumes and said third lever is prevented from assuming its third angular position.