Hammer for breaking polycrystalline silicon
The hammer for breaking polycrystalline silicon is provided with a handle portion extending along a center axis and a head portion extending in a direction intersecting a direction of the center axis at the leading end of the handle portion. The head portion is provided with a head main body connecting with the handle portion, a striking part installed at one end of the head main body via a coupling shaft portion, and a counter weight portion installed at the other end of the head main body. The head main body, the coupling shaft portion, the striking part and the counter weight portion are formed integrally from a hard metal. A round-raised striking surface is formed at the striking part.
1. A hammer for breaking polycrystalline silicon comprising:
a rod-shaped handle portion; and
a head portion extending in a direction intersecting a center axis of the handle portion at a leading end of the handle portion,
wherein the head portion is provided with a head main body connecting with the handle portion, a striking part installed at one end of the head main body via a coupling shaft portion, and a counter weight portion installed at the other end of the head main body,
the head main body, the coupling shaft portion, the striking part and the counter weight portion are formed integrally, and
a first striking surface is formed at the striking part,
the striking part is formed in a half-spherical shape,
a second striking surface is formed at the counter weight portion wherein the second striking surface is formed in a half-spherical shape,
a curvature radius R of the first striking surface and the second striking surface is the range of 5 mm to 30 mm, and
a distance from the center axis of the handle portion to the first striking surface is farther than a distance from the center axis to the second striking surface.
2. The hammer for breaking polycrystalline silicon according to claim 1 , wherein the diameter of the coupling shaft portion is smaller than that of the half-spherical striking part.
3. The hammer for breaking polycrystalline silicon according to claim 1 , wherein when a distance from the center axis of the handle portion to the top of the head of the first striking surface is given as L 1 and a distance from the center axis to the second striking surface of the counter weight portion is given as L 2 , the ratio of L 1 to L 2 is larger than 1 and not more than 2.
4. The hammer for breaking polycrystalline silicon according to claim 1 , wherein the handle portion is made of wood and a synthetic resin protective sleeve is fitted at the outside of the handle portion.
5. The hammer for breaking polycrystalline silicon according to claim 1 , wherein the head portion is made of a material composed of tungsten carbide.
6. A hammer for breaking polycrystalline silicon comprising;
a rod-shaped handle portion; and
a head portion extending in a direction intersecting a center axis of the handle portion at a leading end of the handle portion,
wherein the head portion is provided with a head main body connecting with the handle portion, a striking part installed at one end of the head main body via a coupling shaft portion, and a counter weight portion installed at the other end of the head main body,
a first striking surface is formed at the striking part,
a second striking surface is formed at the counter weight portion,
each of the first and second striking surfaces is formed in a half-spherical shape, and
a distance from the center axis of the handle portion to the first striking surface is farther than a distance from the center axis to the second striking surface.