IMPACT DEVICE AND METHOD OF DISMOUNTING THE SAME

摘要

An impact device and a method of dismounting an impact device from a breaking device is disclosed. The impact device includes a bush having a percussion piston disposed therein. The impact device is arranged inside an impact device space formed in a frame of a breaking device. The percussion piston is provided with a pull shoulder allowing a dismounting force in a return direction to be transmitted from the percussion piston to the bush. Thus, the bush is extracted from the frame by means of the percussion piston.

主权项

1. An impact device comprising:
a percussion piston, which is an elongated object provided with at least one first working pressure surface for moving the percussion piston in an impact direction by a pressure medium, and at least one second working pressure surface for moving the percussion piston in a return direction, the percussion piston including a front end facing towards the impact direction and a rear end facing towards the return direction; a bush, which is an elongated object provided with an outer surface and an inner surface, wherein the percussion piston is located inside the bush; at least one bearing for supporting the percussion piston in the bush; pressure medium ducts for connecting the working pressure surfaces of the percussion piston to a pressure medium system; and at least one pull shoulder having an outer diameter and a first counter surface facing towards the return direction, the inner surface of the bush being provided with at least one counter section located between the pull shoulder and a rear end of the bush, the counter section having an inner diameter, and a second counter surface facing towards the impact direction wherein the outer diameter of the pull shoulder is greater than the inner diameter of the counter section, and wherein the first counter surface of the pull shoulder and the second counter surface of the counter section abut when the percussion piston is pulled in the return direction.