Electronic padlock

An electronic padlock comprising:

• an outer casing unit including a case body that includes
• an accommodation space,
• a rear base wall having a rear opening communicated with said accommodation space, and
• a rear cover plate removably mounted to said rear base wall to cover said rear opening, and having a securing groove;
• a security module rotatably mounted to said rear base wall, and having
• a swing member that is disposed swingably in said accommodation space, and that has a rotation restricting portion, and a hook portion removably engageable with said securing groove of said rear cover plate,
• a rotatable button that is disposed outside of said accommodation space, that extends into said accommodation space to connect said swing member, and that is operable to rotate said swing member, and
• two spaced apart insertion holes that extend through an outer surface of said case body and an inner surface of said case body in a top-bottom direction;
• a shackle unit including a long shackle leg and a short shackle leg that are respectively movably inserted through said insertion holes in a top-bottom direction, each of said long and short shackle legs having a notch;
• and
• a clutch unit mounted to said outer casing unit, and including two slide blocks that are movable in a left-right direction, and a blocking member that is movable in the top-bottom direction, each of said slide blocks having an engaging portion for removably engaging a notch of one of said long and short shackle legs;
• wherein said blocking member is movable in said top-bottom direction between a locked position and an unlocked position;
• wherein, in the locked position, said blocking member is interposed between said two slide blocks to lock said slide blocks against movements that causes said engaging portions of said slide blocks to disengage from said notches of said long shackle leg and said short shackle leg, so that a bottom end of said long shackle leg stably presses said rotation restricting portion of said swing member, and so that said hook portion of said swing member stably engages said securing groove of said cover plate;
• wherein, in the unlocked position, said blocking member is distal to said slide blocks to allow movements of said slide blocks that causes said slide blocks to disengage from said notches of said long and short shackle legs, so that said bottom end said long shackle leg unpresses said rotation restricting portion of said swing member, said rotatable button is operable to rotate and disengage said hook portion of said swing member from said securing groove of said rear cover plate;
• wherein said rear base wall further has two slide slots, that both extend in the left-right direction, and that are spaced apart in the left-right direction, one of said slide slots being higher than the other one of said slide slots in the top-bottom direction;
• wherein each of said slide blocks has a top surface that faces a top side of said outer casing unit, a bottom surface that faces a bottom side of said outer casing unit, and a rear surface that faces said rear base wall, and a guide post that is slidable in one of said two slide slots in the left-right direction, and that protrudes rearwardly from said rear surface and located between said top and bottom surfaces;
• wherein each of said slide blocks has said engaging portion with a first surface opposite to said notch of one of said long and short shackle legs and further has an overlapping portion that protrudes from said first surface in the left-right direction, and that has a second surface distal to said first surface;
• wherein said overlapping portions of said slide blocks overlaps with each other between said engaging portions of said slide blocks and is stacked one above the other, each of said guide posts protruding rearwardly from said overlapping portion of a respective one of said slide blocks, said slide slots being formed in said rear base wall at a position rearwards of said rear surface of each of said slide blocks;
• wherein, when said blocking member moves to the locked position, said guide posts of said slide blocks respectively slide along said slide slots to move away from each other;
• and
• wherein, when said blocking member moves to the unlocked position, said guide posts of said slide blocks respectively slide in said slide slots to move toward each other.