Key controlled lock mechanisms for zipper fasteners

A key controlled lock mechanism for locking in closed position the zipper slider of a separable zipper-type fastener, comprising a lock member formed in the shape of a thick circular disc-like lock body of small axial thickness relative to its diameter, the disc-like lock body including a cup shaped casing forming a thin walled casing shell of generally cylindrical configuration having a circular front wall bounded by a rearwardly projecting annular rim flange and including a circular backing plate fastened thereto at the rearmost rear portions of said rim flange to define a cylindrical lock chamber between said backing plate and front wall, a circular latch plate having a diameter approximating the diameter of said chamber supported by sliding peripheral contact with the outwardly surrounding rim flange for rotary angular movement about the center axis of the lock body between latching and release positions and having a radially outwardly projecting finger piece extending beyond the rim flange forming a manually operable shifting tab for movement of the latch plate toward the release position, the circular latch plate having a peripheral cut-out shaped to define a circumferentially extending latch tongue adjacent its periphery and having a shaped intermediate recess near and eccentric of its center shaped to coact with a key-operable locking disc, a locking disc journaled at a fixed station in the casing for rotation in said recess about an eccentric axis offset from said center axis having a key slot for rotation of the locking disc by a key inserted therein and having a locking surface extending in a generally circular path confronting the boundary surfaces of the intermediate recess to restrain the latch plate against rotation from said latching position and to free the same for rotation to release position at locking and unlocking positions respectively of the locking disc, means defining a keeper formation insertable into the casing for securing the slider in the closing position, and said casing having recesses for accommodating circumferential movement of said finger piece and for admitting the keeper formation into the casing into latched coupling engagement with said latch tongue.