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An auxiliary lock includes a housing, a positioning seat securely mounted in the housing, a lock core housing securely mounted in the positioning seat and including a compartment, and a lock core removably mounted in the compartment of the lock core housing. The lock core includes two lateral sides

An auxiliary lock includes a housing, a positioning seat securely mounted in the housing, a lock core housing securely mounted in the positioning seat and including a compartment, and a lock core removably mounted in the compartment of the lock core housing. The lock core includes two lateral sides each having a recessed section. A core lug is received in one of the recessed sections. The core lug is movable by rotation of a key for changing lock cores. The lock core housing further includes two cutout sections respectively defined in two lateral sides thereof. One of the cutout sections includes a slot communicated with the compartment of the lock core housing. A lateral inner wall that defines a portion of the compartment of the lock core housing includes a protruded edge. A lug retainer is mounted in the cutout section having the slot. The lug retainer includes a first end retained in the cutout section having the slot. The lug retainer further includes a second end extended into the compartment of the lock core housing for releasably engaging with a groove of the core lug. When the lock core is at a position for locking/unlocking operation, the core lug of the lock core bears against the protruded edge of the lock core housing, while the lug retainer is received in the groove of the core lug to prevent from forcible outward movement of the lock core by axial pull.

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[ What is claimed is:] [1.] An auxiliary lock comprising a housing, a positioning seat securely mounted in the housing, a lock core housing securely mounted in the positioning seat and including a compartment, and a lock core removably mounted in the compartment of the lock core housing, the lock co

[ What is claimed is:] [1.] An auxiliary lock comprising a housing, a positioning seat securely mounted in the housing, a lock core housing securely mounted in the positioning seat and including a compartment, and a lock core removably mounted in the compartment of the lock core housing, the lock core including two lateral sides each having a recessed section, a core lug being removably received in one of the recessed sections, the core lug including a groove defined therein, the lock core housing further including two cutout sections respectively defined in two lateral sides thereof, one of the cutout sections including a slot communicated with the compartment of the lock core housing, a lateral inner wall that defines a portion of the compartment of the lock core housing including a protruded edge, and further including a lug retainer mounted in the cutout section having the slot, the lug retainer including a first end retained in the cutout section having the slot, the first end of the lug retainer including an arcuate section the lug retainer further including a second end extended through the slot into the compartment of the lock core housing for releasably engaging with the groove of the core lug,wherein when the lock core is at a position for locking/unlocking operation, the core lug bears against the protruded edge, while the lug retainer is received in the groove of the core lug.