A shackle lock comprising:
- a seamless lock casing having a lock core chamber, a lock core opening for access to said lock core chamber and aligned with said lock core chamber in a first direction, a first shackle chamber, a first shackle hole for access to said first shackle chamber and aligned with said first shackle chamber in a second direction parallel to the first direction, a second shackle chamber, a second shackle hole for access to said second shackle chamber and aligned with said second shackle chamber in a third direction transverse to the second direction, a first channel confined by a first channel-confining wall and extending in a fourth direction transverse to said first and second directions for communicating said lock core chamber and said first shackle chamber, and a second channel confined by a second channel-confining wall and extending in the second direction for communicating said first shackle chamber and said second shackle chamber;
- a lock core received in said lock core chamber via said lock core opening and having a latch member and a keypassage that is exposed from said lock core opening and that is adapted to receive a key for moving said latch member between a locking position, in which said latch member extends through said first channel and projects into said first shackle chamber, and an unlocking position, in which said latch member is moved out of said first shackle chamber;
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- a shackle unit including first and second shackle connecting members and a flexible elongated shackle portion with two opposite ends connected respectively to said first and second shackle connecting members, said first shackle connecting member being extendible into said first shackle chamber via said first shackle hole and being formed with a locking groove for engaging said latch member when said latch member is moved to the locking position, said second shackle connecting member being extendible into said second shackle chamber via said second shackle hole and being provided with a retaining member that extends into said second channel and that engages said second channel-confining wall upon movement of said second shackle connecting member in said third direction so as to retain said second shackle connecting member in said lock casing, said locking groove in said first shackle connecting member being disengaged from said latch member when said latch member is moved to the unlocking position, thereby permitting removal of said first shackle connecting member from said lock casing via said first shackle hole, said retaining member on said second shackle connecting member being accessible by means of a tool which is inserted into said second channel via said first shackle chamber and said first shackle hole when said first shackle connecting member is removed from said first shackle hole and being adapted to be actuated by the tool for disengaging from said second channel-confining wall in order to be removed from said lock casing via said second shackle hole;
- wherein said latch member includes a latch base which projects from said lock core in said lock core chamber in said first direction, which is rotatable when said lock core is operated via the key, and which is formed with a retaining hole extending in said first direction, said latch member further including a latch body which has an engaging end extendible into said locking groove, a linking arm projecting from said engaging end in said fourth direction to said retaining hole, and an engaging tongue projecting from said linking arm into said retaining hole so that rotation of said latch base results in movement of said latch body in said fourth direction toward and away from said locking groove, thereby permitting engagement and disengagement between said engaging end and said locking groove;
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- wherein said latch base has a curved stopping wall that extends curvedly from a periphery of said retaining hole, said latch body further including a stopping arm that projects from said engaging end toward said stopping wall in such a manner that said stopping arm releasably engages said stopping wall when said latch member is moved from said locking position to said unlocking position so as to prevent further rotation of said latch base and that said stopping wall moves away from said engaging arm when said latch member is moved from said unlocking position to said locking position.