Binder apparatus are disclosed. An example binder apparatus includes a housing, first and second carrier rails supported by the housing and a slider movable between a first position and a second position. In the first position, the slider to secure the first and second carrier rails in a closed position. In the second position, the slider to enable pivotable movement of the first and second carrier rail. The binder apparatus includes a lever to pivot the first carrier rail and the second carrier rail. The lever includes a groove and a channel. The groove to receive a portion of the first and second carrier rails, the channel to receive an end of the slider. The end of the slider to move within the channel to delay movement of the slider when the lever pivots the first and second carrier rails from the open position toward the closed position.