Rock drill
AssigneeSandvik Mining and Construction Oy
InventorsEsa Rantala, Timo Muuttonen, Ari Kotala, Pekka Saukko
Life of this patent
Estimating the term…
Abstract
A rock drill includes a frame, a percussion member, an axial shank, and an axial sleeve provided within the frame and including a first pressure surface provided in a first pressure space and a second pressure surface provided in a second pressure space. A first channel is provided in the axial sleeve for providing a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame. A second pressure channel connected to the second pressure space is connectable to external pressure. A pressure accumulator is connected to the first pressure space and the flow of the pressure medium outwards from the first pressure space is throttled.
Claims12
A rock drill comprising at least:
- a frame;
- a percussion member for generating impact pulses;
- an axial shank provided on a front side of the percussion member in a direction of an impact and including an impact surface for receiving said impact pulses;
- an axial sleeve provided within the frame and including a first pressure surface facing towards the shank provided in a first pressure space and a second pressure surface facing away from the shank provided in a second pressure space, wherein the first pressure space is provided in an axial direction on a side of the shank in relation to the axial sleeve and the second pressure space is provided in an axial direction on the side of the axial sleeve opposite to that of the shank, and wherein pressure medium fed to said pressure spaces is arrangeable to act on the first pressure surface and/or on the second pressure surface for moving the axial sleeve in the axial direction;
- a first channel provided in the axial sleeve, which first channel provides a connection between the first pressure space and the second pressure space in at least one position of the axial sleeve in the frame;
- a second pressure channel connected to the second pressure space, which second pressure channel is connectable to external pressure;
- and
- a pressure accumulator is connected to the first pressure space and that flow of the pressure medium outwards from the first pressure space is throttled by throttling the flow of the pressure medium from the first pressure space to a tank and/or the pressure lower than that of the external pressure connected to the second pressure space.
Dependencies are inferred from the claim text.