Chain cover for an exercise pedal assembly

A chain cover for an exercise pedal assembly comprising a casing body having a front casing part with a rear opening, and a rear casing part that is connected detachably to said front casing part to close said rear opening, said front casing part having a first top wall, a bottom wall and two opposing first side walls interconnecting said first top wall and said bottom wall, said first top wall having a first top end, said first side walls having opposing first side ends which extend downwardly from said first top end, said bottom wall having a U-shaped first bottom end with two opposing portions which extend respectively and rearwardly from said first side ends and which merge with one another after turning toward one another, said rear opening being defined by said first top end, said first side ends and said first bottom end, said rear casing part having a second top wall, two opposing second side walls extending downwardly from said second top wall, and a rear wall connected to said second top wall and said second side walls, said second top wall having a second top end opposite to said rear wall, said second side walls having opposing second side ends that extend downwardly from said second top end, said second side walls and said rear wall cooperatively forming a U-shaped second bottom end, said U-shaped second bottom end having two opposing portions which extend respectively and rearwardly from said second side ends to said rear wall, said first and second side ends extending straightaway in a downward direction, said first top wall and said first side walls being provided with first rail members, said second top wall and said second side walls being provided with second rail members, said first and second rail members on said first and second top walls being interlocked with one another to prevent said rear casing part from disengaging rearwardly from said front casing part when said front and rear casing parts are connected to one another, said first and second rail members on said first and second side walls interconnecting slidably said first and second side ends and permitting said second side ends to slide over said first side ends in a downward direction from said first top end when said front and rear casing parts are connected to one another.