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| Number | Title | Issue Date |
| 6739412 | Pile boring tools A boring apparatus is described which comprises a substantially hollow vessel with a fixed base and a rotatable base. The rotatable base is provided, at its circumference, with at least one side cutter which rotatable with the rotatable base from a first position, i... | 05/25/2004 |
| 5931235 | Cutter head, boring jig and device and process for sea bottom boring A cutter head for retrieving earth samples, in particular for taking underwater samples, has, because of frustum-shaped cutting wheels, an approximately round bore cross section. In an associated boring jig, a tube with a cross section corresponding appro... | 08/03/1999 |
| 5797202 | Vertical hole excavating machine A vertical hole excavating machine having a cutter head comprising: a first head supported rotatably about the axis of a cylindrical shield body at the lower end of the cylindrical body and having a central space vertically extending therethrough; at leas... | 08/25/1998 |
| 4765418 | Borehole drill construction A borehole drill construction comprising a cylindrical casing, a chuck mounted on one end of the casing by means of a screw-thread and a cutter head carried by the chuck. The chuck has at least one axially projecting dog thereon which is received in a cor... | 08/23/1988 |
| 4156471 | Rubble and core removal apparatus A rubble and core removal apparatus including a casing, open at one end, with spirally extending flighting disposed therein, the flighting being secured to the inner wall of the casing and extending radially inwardly thereof in changing dimension, the cas... | 05/29/1979 |
| 4122905 | Hand auger A hand auger comprises a frustoconical sheet of material split along a lateral strip to form a pair of lateral edges in spaced relation radially and circumferentially. One of the edges is an inner edge of predetermined length and the other of the edges is... | 10/31/1978 |
| 4023629 | Toggle actuated underreamer An underreamer includes a housing and a plurality of underreamer doors, each including a toggle mechanism for selectively extending and retracting the doors. Upon activation of the toggle mechanism thereby extending the doors, the doors are pivoted outwar... | 05/17/1977 |
