A hammer assembly for breaking, levering and raking material, said hammer assembly including: - an impact hammer including: ∘ a movable mass capable of linear reciprocating movement for impact along an impact axis, ∘ an elongated tool received within the hammer assembly, said tool having a longitudinal axis substantially parallel or coaxial with said impact axis, said tool having two opposed ends with one end projecting from the hammer assembly to form an operative tool head for use during said levering and/or raking operations; ∘ a primary pivot attachment point adapted for attaching the hammer to a distal end of an operating arm attached to a carrier for pivotal movement of the hammer about a primary pivot axis orthogonal to said impact axis; - an articulated control linkage including first and second links for effecting said pivotal movement of the hammer about said primary pivot axis in response to movement from a drive attached to said operating arm, ∘ said first link being pivotally attached: ▪ to said hammer at a first end to form a secondary pivot axis parallel to said primary pivot axis, ▪ at a second end to said drive forming a tertiary pivot axis and ▪ to said second link, ∘ said second link being pivotally attached ▪ at a first end to the operating arm forming a quaternary pivot axis parallel to said secondary and tertiary axes, ▪ at a second end to said second end of said first link and ▪ at a second end to said drive, said primary, tertiary and quaternary pivot axes all located on an opposing side of said impact axis to said secondary pivot axis, wherein said primary pivot axis is located laterally to said impact axis (between said opposed distal ends of the tool and characterised in that said first link includes a pair of arms (4a, 4b), spaced apart to receive the hammer therebetween. - an impact hammer including: ∘ a movable mass capable of linear reciprocating movement for impact along an impact axis, ∘ an elongated tool received within the hammer assembly, said tool having a longitudinal axis substantially parallel or coaxial with said impact axis, said tool having two opposed ends with one end projecting from the hammer assembly to form an operative tool head for use during said levering and/or raking operations; ∘ a primary pivot attachment point adapted for attaching the hammer to a distal end of an operating arm attached to a carrier for pivotal movement of the hammer about a primary pivot axis orthogonal to said impact axis; ∘ a movable mass capable of linear reciprocating movement for impact along an impact axis, ∘ an elongated tool received within the hammer assembly, said tool having a longitudinal axis substantially parallel or coaxial with said impact axis, said tool having two opposed ends with one end projecting from the hammer assembly to form an operative tool head for use during said levering and/or raking operations; ∘ a primary pivot attachment point adapted for attaching the hammer to a distal end of an operating arm attached to a carrier for pivotal movement of the hammer about a primary pivot axis orthogonal to said impact axis; - an articulated control linkage including first and second links for effecting said pivotal movement of the hammer about said primary pivot axis in response to movement from a drive attached to said operating arm, ∘ said first link being pivotally attached: ▪ to said hammer at a first end to form a secondary pivot axis parallel to said primary pivot axis, ▪ at a second end to said drive forming a tertiary pivot axis and ▪ to said second link, ∘ said second link being pivotally attached ▪ at a first end to the operating arm forming a quaternary pivot axis parallel to said secondary and tertiary axes, ▪ at a second end to said second end of said first link and ▪ at a second end to said drive, ∘ said first link being pivotally attached: ▪ to said hammer at a first end to form a secondary pivot axis parallel to said primary pivot axis, ▪ at a second end to said drive forming a tertiary pivot axis and ▪ to said second link, ▪ to said hammer at a first end to form a secondary pivot axis parallel to said primary pivot axis, ▪ at a second end to said drive forming a tertiary pivot axis and ▪ to said second link, ∘ said second link being pivotally attached ▪ at a first end to the operating arm forming a quaternary pivot axis parallel to said secondary and tertiary axes, ▪ at a second end to said second end of said first link and ▪ at a second end to said drive, ▪ at a first end to the operating arm forming a quaternary pivot axis parallel to said secondary and tertiary axes, ▪ at a second end to said second end of said first link and ▪ at a second end to said drive,