Rock cutting device
AssigneeJoy Global Underground Mining LLC
InventorsPeter A. Lugg, Geoffrey W. Keech
Life of this patent
Estimating the term…
Abstract
A rock excavating device includes a shaft and a cutting element. The shaft includes a first portion and a second portion connected to an end of the first portion. The first portion is rotatable about a first axis. The second portion extends along a second axis that is oblique with respect to the first axis. The cutting element includes a cutting edge. The cutting element is supported on the second portion and rotatable about the second axis. Rotation of the first portion of the shaft about the first axis changes the orientation of the second axis and the cutting element.
Claims20
A rock excavating device comprising:
- a shaft including a first portion and a second portion connected to an end of the first portion, the first portion supported for free rotation about a first axis, the second portion extending along a second axis that is oblique with respect to the first axis;
- and
- a cutting element including a cutting edge having a leading portion and a trailing portion spaced apart from the leading portion, the cutting element supported on the second portion and rotatable about the second axis, reaction forces exerted on the cutting edge inducing a moment driving rotation of the first portion of the shaft about the first axis, thereby re-orienting the leading portion of the cutting edge to engage a rock surface.
A cutting assembly for a rock excavation machine, the cutting assembly comprising:
- a boom;
- and
- a cutting device supported on the boom, the cutting device including a shaft and a cutting edge, the shaft including a first portion and a second portion, the first portion supported for free rotation about a first axis, the cutting edge having a leading portion and a trailing portion spaced apart from the leading portion, the cutting edge supported on the second portion and rotatable about a second axis oriented obliquely with respect to the first axis, reaction forces exerted on the cutting edge inducing a moment driving rotation of the shaft about the first axis, thereby re-orienting the leading portion of the cutting edge to engage a rock surface.
A rock excavating device comprising:
- a shaft including a first portion and a second portion, the first portion supported for free rotation about a first axis, rotation of the first portion changing an orientation of the second portion;
- and
- a cutting element including a cutting edge having a leading portion and a trailing portion spaced apart from the leading portion, the cutting element supported on the second portion and rotatable about a second axis oriented obliquely relative to the first axis, reaction forces exerted on the cutting edge inducing a moment driving rotation of the first portion of the shaft about the first axis, thereby re-orienting the leading portion of the cutting edge to engage a rock surface.
Dependencies are inferred from the claim text.