Hammer for a Charpy pendulum

1. A hammer for a Charpy pendulum, the hammer comprising:

a body including a head and an arm, wherein the arm is equipped with a portion for attachment to an end opposite to that of the head and wherein the head has a general C-shape, with a concave part situated in which is an area of impact, wherein the arm and the head of said body are obtained in a monolithic form by means of perimetral cutting of a plane plate and;

a percussion member connected to the concave part of the head by at least one attachment member.

2. The hammer according to claim 1 , wherein the percussion member is applied in said area of impact.

3. The hammer according to claim 1 , further comprising a plurality of weights applied on opposite faces of the body.

4. The hammer according to claim 3 , further comprising a first pair of weights and a second pair of weights, wherein the weights have a mass and dimensions substantially equal to one another.

5. The hammer according to claim 4 , wherein the weights are positioned on the body so that by varying the mass and the moment of inertia of the weights in a way equal to one another it is possible to vary the nominal energy of the hammer maintaining the reduced length of the hammer unaltered.

6. The hammer according to claim 3 , wherein the weights can be varied in pairs to calibrate the reduced length and the nominal energy of the hammer.

7. The hammer according to claim 3 wherein each of said weights comprises a plurality of washers disposed in a hollow casing.

8. The hammer according to claim 1 , wherein said attachment section comprises a through hole with an open edge having a width smaller than the diameter of the hole.

9. The hammer according to claim 8 , further comprising a wedge-shaped blocking member designed to block said attachment portion axially.

10. The hammer according to claim 1 , further comprising a first pair of weights and a second pair of weights set on the body at opposite sides with respect to the area of impact.

11. The hammer according to claim 10 , wherein the said first pair of weights are positioned on the body between the area of impact and an end of the head.

12. The hammer according to claim 11 , wherein the said second pair of weights are positioned on the body between the area of impact and a centre of rotation of the hammer.

13. The hammer according to claim 10 , wherein the arm and the head have the same thickness.

14. A hammer configured to be mounted on a shaft of a Charpy pendulum, the hammer comprising:

a body having a head portion, an arm portion and an attachment portion, wherein the head includes a concave part that defines an area of impact and wherein the attachment portion is configured to mate with a portion of the shaft and the attachment portion includes a through hole with an open edge having a width smaller than the diameter of the hole; and

a first pair of weights positioned on the body on one side of the area of impact and a second pair of weights positioned on the body on another side of the area of impact.

15. The hammer according to claim 14 , further comprising a percussion member attached to the concave part of the head proximate the area of impact.

16. The hammer according to claim 14 , wherein the head portion and the arm portion have the same thickness.

17. The hammer according to claim 14 , wherein the first pair of weights are located on the head portion.

18. The hammer according to claim 14 , wherein the attachment portion includes a positioning notch that is configured to mate with a projection on the shaft.

19. The hammer according to claim 14 , wherein the arm and the head of said body are obtained in a monolithic form by perimetral cutting of a plane plate.