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| Number | Title | Issue Date |
| 8118113 | Hydraulic control system for drilling systems A hydraulic control system includes a first motor, a second motor, a pump operatively associated with the first motor, a first coupling valve operatively associated with the second motor, first parallel valves operatively associated with the second motor, and a firs... | 02/21/2012 |
| 7096972 | Hammer drill attachment Power tools of the type under consideration include hammer drills, for example, which are electric or battery powered and includes two modes of operation: a rotation mode and a rotation-hammer mode. A manually operable selector lever enables the hammer drill to be s... | 08/29/2006 |
| 6889779 | Auger/vehicle interface jig An interface jig for removably securing a portable auger to a vehicle includes a carriage guide assembly, a sliding carriage assembly and a receiver assembly. The carriage guide assembly includes a vertical support having an upper portion and a bottom portion. A hit... | 05/10/2005 |
| 6741051 | Power tool trigger control A trigger controller for an electric power tool including a motor and a pull-trigger movable along a path having a foremost home position comprises a mechanical switch and a solid-state switch connected in series to the motor, wherein the mechanical switch includes ... | 05/25/2004 |
| 6267187 | Boring apparatus with coupling for rapid connection of drill string segments In apparatus for producing and expanding earth boreholes and for destroying and replacing underground pipelines or for driving in pipes, a feed drive and a rotary drive having a plug-in coupling comprising a chuck and a locking portion at the end of a str... | 07/31/2001 |
| 6234260 | Mobile drilling apparatus An apparatus for drilling boreholes into the earth includes a mobile carrier with a frame that supports an elongated housing. The housing has upper and lower end portions. An drill pipe section holder is positioned at the lower end of a tubular member rot... | 05/22/2001 |
| 5762148 | Boring tool A boring tool with two driving heads which are used to sink a casing string and a borer string includes a controllable coupling mechanism fitted between the two driving heads. A mechanism is also provided for the lower driving head, such that the driving ... | 06/09/1998 |
| 5697457 | No load derrick for drilling rig A mobile drilling rig has a rectangular tubular derrick or mast normally transported on the truck in a generally horizontal attitude. The mast is pivoted to vertical at the drilling site. A drill rotating power head is connected to a pull-down system loca... | 12/16/1997 |
| 5657417 | Control for battery powered tool A tool with a battery, an electrical motor, and a control system. The control system has a trigger control that connects the battery to a timer and a voltage monitor. The trigger control has a user actuated switch and a timer actuated switch. At the end o... | 08/12/1997 |
| 5592993 | Directional auger attachment The present invention is directed to an auger attachment which is mounted on the stick of a backhoe which provides directional capabilities to the auger. More specifically, the auger attachment includes an outer body, an inner telescoping body and a pisto... | 01/14/1997 |
| 5477680 | Motor driven hydraulic tool with variable displacement hydraulic pump A hydraulic drive system for a battery operated portable compression tool. The tool has an electric motor. The drive system has a self-regulating variable displacement pump with a rotatable conduit frame having radial conduits, pistons reciprocally locate... | 12/26/1995 |
| 5355965 | Mounting apparatus for a rotational drive unit A mounting apparatus for a rotational drive unit. The rotational drive unit includes a socket portion which receives a truck or carrier. Opposing engagement surfaces of the carrier are separated by a distance greater than the length of the socket. The res... | 10/18/1994 |
| 5094302 | Drilling rig A mobile drilling rig includes a rectangular tube which is used for the derrick and is normally transported on the vehicle in a generally horizontal attitude. The derrick is pivoted to vertical position by a hydraulic cylinder. A pulldown system located i... | 03/10/1992 |
| 4487273 | Gripping tool adapted for use with device for driving rod-shaped elements into and out of the ground A distinguishing feature of the present invention comprising a shell with side ports and an axial taper through cavity whose generatrix is inclined to the shell center line at an angle of less than the self-wedging angle, spring-biased gripping jaws accom... | 12/11/1984 |
| 4479550 | Submerging ramming arrangement A submerging ramming arrangement has a housing, an impacting body axially displaceable in the housing for delivering ramming impacts against a ramming pile, a hydraulic drive for displacing the impacting body in the housing, a hydraulic cylinder-and-pisto... | 10/30/1984 |
| 4351399 | Drill An earth drilling apparatus including centralizer means for stabilizing a drive rod during drilling operations.... | 09/28/1982 |
| 4299294 | Rotary tool with axial feed The tool includes an elongated body, rectangular in cross-section and having a switch housing mounted on one side face, to enable the mounting of an array of such tools in close side-by-side relation. A hydraulic motor, rotary drive spindle, and extensibl... | 11/10/1981 |
| 3980342 | Auger type mining machine An auger type mining machine in which the rotational torque necessary to do the mining is supplied separately and independently from the force required to advance the auger, and is provided by a motor having a stator portion insulated from, secured to and... | 09/14/1976 |
