Material clamping apparatus

Material clamping apparatus for use on a pivoted tractor bucket which has an upper edge and a lower edge, said apparatus comprising:

• (a) a mounting bracket which is fixed to the upper edge of the bucket,
• (b) a connecting bracket which is mounted on said mounting bracket for pivoting movement about a horizontal axis which is transverse to said upper edge between a horizontal active position to a vertical inactive position,
• (c) an elongated clamp arm which is mounted on said connecting bracket for pivoting movement within a vertical plane between an upper non-clamping position to a lower clamping position relative to the lower edge of said bucket when said connecting bracket is in its active position, said elongated arm extending above and parallel to said upper edge when said connecting bracket is in its inactive position and said clamping arm is in said upper non-clamping position relative to said connecting bracket,
• (d) hydraulic actuating means for selectively moving said clamping arm to either said upper non-clamping position or said lower clamping position,
• (e) first retaining means for selectively maintaining said connecting bracket in said active position, said first retaining means having a first portion which is fixed to said mounting bracket and a second portion which is movable relative to said first portion for selectively engaging said connecting bracket and for selectively locking said connecting bracket relative to said first portion, the second portion of first retaining means comprising a locking bracket which is pivotally connected to said mounting bracket for pivoting movement between a locking position and an unlocking position, said locking bracket having a retaining finger which is fixed to said locking bracket and which engages said connecting bracket when said locking bracket is in its locking position for preventing said connecting bracket from pivoting about its horizontal pivoting axis, and
• (f) second retaining means for selectively maintaining said connecting bracket in said inactive position, said second retaining means being fixed to said mounting bracket and spaced from said first retaining means.