Hammer device

1. A hammer assembly, including:

a housing with at least one opening;

a hammer formed as a substantially elongated unitary weight formed with integral first and second tool ends located at opposing longitudinal distal ends of the weight, said hammer including at least two protrusions, said hammer received in the housing in a first orientation; and

a drive mechanism including a dog attached to a loop of chain extending about at least two sprockets, at least one sprocket being connected to a motor and rotatable to drive said chain and attached dog, the dog engaging with said protrusions on the hammer during said rotation to reciprocate the hammer by driving the hammer in,

a first direction away from an external working surface, and

an opposing second direction toward the working surface, said tool striking the working surface through said housing opening,

wherein the hammer is capable of being removed from the housing and re-inserted in the housing in a second orientation with said first and second tool ends being reversed.

2. The hammer assembly as claimed in claim 1 , wherein the hammer includes at least two protrusions located on a common lateral hammer face, said drive mechanism configured to engage one said protrusion when driving the hammer in the first direction and engage with the other protrusion when driving the hammer in the second direction.

3. The hammer assembly as claimed in claim 2 , wherein the hammer includes at least two protrusions on each of two opposing lateral hammer faces.

4. The hammer assembly as claimed in claim 2 , further including a cushion fixed to the housing for engaging one of the protrusions.

5. The hammer assembly as claimed in claim 1 , wherein the housing is configured for attachment to an articulated arm of an excavator or other machine and the drive mechanism is enclosed within the housing.

6. The hammer assembly as claimed in claim 1 , wherein the hammer is multifaceted.

7. The hammer assembly as claimed in claim 1 , wherein the opposing hammer tool ends are non-identical.

8. The hammer assembly as claimed in claim 1 , wherein the tool ends are configured as a substantially flat surface, a blade, a substantially convex surface, substantially concave surface, or a spike.

9. The hammer assembly as claimed in claim 1 , wherein said rotation of the sprockets, dog and chain is substantially parallel to the hammer.

10. The hammer assembly as claimed in claim 1 , further including a connecting apparatus between the hammer and the hammer housing.

11. The hammer assembly as claimed in claim 10 , wherein the connecting apparatus is capable of elastic deformation.

12. The hammer assembly as claimed in claim 10 , wherein the connecting apparatus is detachable.

13. A hammer assembly, including: a housing with at least one opening; a hammer formed as a substantially elongated unitary weight formed with integral first and second tool ends located at opposing longitudinal distal ends of the weight, said hammer including at least two protrusions, said hammer received in the housing in a first orientation; and a drive mechanism including a dog attached to a loop of chain extending about at least two sprockets, at least one sprocket being connected to a motor and rotatable to drive said chain and attached dog, the dog engaging with said protrusions on the hammer during said rotation operable to reciprocate the hammer by driving the hammer in, a first direction away from an external working surface, and an opposing second direction toward the working surface, said tool striking the working surface through said housing opening, wherein the hammer is capable of being removed from the housing and re-inserted in the housing in a second orientation with said first and second tool ends being reversed; wherein said hammer is received in the housing in said first orientation, said method characterised by the steps of: withdrawing the hammer from the housing, and reinserting the hammer in said second orientation.