Loaders for use in tunnels
AssigneeGeneral Mining and Finance Corporation Limited
InventorsRolf C. Bohme, Dieter G. Luck
Life of this patent
Estimating the term…
Abstract
A loader comprises a bucket at the end of a dipper arm swinging from a cross-member on an upstanding yoke. The dipper arm swings between the uprights to the yoke for the bucket to pick up material on one side and deposit it on the other side. A winch actuates the bucket to dig and lift on the one side and a cam causes the bucket to turn upside down on the other side to deposit its load. The yoke can lean to the one side to extend the reach of the dipper arm and can slew about a vertical axis. The yoke can center itself when the dipper arm swings to the other side. For travelling the whole assembly can fold into a compact bundle.
Claims9
A loader comprising:
- a base;
- a yoke extending above the base and having uprights spaced apart at their top ends by a cross-member between the uprights;
- a shaft between the uprights;
- a dipper arm swinging from the shaft to move to either side of the yoke between the uprights and below the shaft;
- means to cause the dipper arm to swing between a loading position at a first side of the yoke and an unloading position at the opposite second side of the yoke;
- a bucket pivoted to the free end of the dipper arm about a first axis parallel to the shaft;
- and
- means to rotate the bucket about its pivot axis from a digging attitude to a load retaining attitude whereby the bucket is below the horizontal plane containing the dipper shaft during the loading and unloading positions.
A loader comprising:
- a base mounted for rotation about a vertical axis;
- a hydraulic cylinder to slew the base about the vertical axis;
- a yoke extending above the base and having uprights spaced apart at their top ends by a cross-member between the uprights, the uprights being pivoted on the base about a leaning axis;
- a shaft extending between the uprights parallel to the leaning axis;
- a hydraulic cylinder to cause the yoke to move between an erect and a forward leaning position about the leaning axis;
- a dipper arm swinging from the shaft to move to either side of the yoke between the uprights and below the shaft;
- a hydraulic cylinder to cause the dipper arm to swing between a loading position forwardly of the yoke and an unloading position rearwardly of the yoke;
- a bucket pivoted to the free end of the dipper arm about a pivot axis parallel to the shaft;
- winch means to cause the bucket to pivot about its pivot axis from a digging attitude to a load retaining attitude;
- and
- means to cause the bucket to turn upside down in the unloading position of the dipper arm whereby the bucket is below the horizontal plane containing the dipper shaft during the loading and unloading positions.
Dependencies are inferred from the claim text.