Protective apparatus for preventing the infiltration of contaminants in a fluid-operated percussion device

A percussion device having a protective apparatus for preventing the infiltration of contaminants, said device comprising:

• a fluid-operated percussion device, having a striking tool that is guided to move in a housing by a striking tool guide, and is driven by a percussion piston in the striking direction, and a seal that is supported at least indirectly on one of the housing and the striking tool and has a securing portion that is fixedly disposed with respect to one of the housing and the striking tool, with the seal being disposed between an inner guide portion of the striking-tool guide and a theoretical striking plane of the percussive piston on the striking tool, when seen in the direction opposite the striking direction, and a countersurface provided on said one of the striking tool and the housing tool, which countersurface moves relative to the securing portion of the seal, is in contact with the seal, and is unaffected by wear;
• and wherein the seal is connected by its securing portion to an exchangeable receiving sleeve that in turn is secured to one of the striking tool and the housing, and the receiving sleeve constitutes a component of the cushioning ring.

A percussion device having a protective apparatus for preventing the infiltration of contaminants, said device comprising:

• a fluid-operated percussion device, having a striking tool that is guided to move in a housing by a striking tool guide, and is driven by a percussion piston in the striking direction, and a seal that is supported at least indirectly on one of the housing and the striking tool and has a securing portion that is fixedly disposed with respect to one of the housing and the striking tool, with the seal being disposed between an inner guide portion of the striking-tool guide and a theoretical striking plane of the percussive piston on the striking tool, when seen in the direction opposite the striking direction, and a countersurface provided on said one of the striking tool and the housing tool, which countersurface moves relative to the securing portion of the seal, is in contact with the seal, and is unaffected by wear;
• and wherein a diameter of the striking tool over the length of the countersurface is smaller than a diameter of the striking tool in the region of the inner guide portion, whereby the countersurface does not engage an inner surface of the inner guide portion.

A percussion device having a protective apparatus for preventing the infiltration of contaminants, said device comprising:

• a fluid-operated percussion device, having a striking tool that is guided to move in a housing by a striking tool guide, and is driven by a percussion piston in the striking direction, and a seal that is supported at least indirectly on one of the housing and the striking tool and has a securing portion that is fixedly disposed with respect to one of the housing and the striking tool, with the seal being disposed between an inner guide portion of the striking-tool guide and a theoretical striking plane of the percussive piston on the striking tool, when seen in the direction opposite the striking direction, and a countersurface provided on said one of the striking tool and the housing tool, which countersurface moves relative to the securing portion of the seal, is in contact with the seal, and is unaffected by wear;
• and wherein the seal is formed as an outwardly directed seal and is fixedly held by its securing portion relative to the striking tool.