Abstract: A drilling apparatus includes a housing that defines a longitudinal axis. A power section of the apparatus includes rotor adapted to move with eccentric rotary motion with respect to the longitudinal axis in response to the passage of drilling fluids through the power section. A power transmission shaft has an upper end coupled to the rotor and movable with the eccentric motion of the rotor, and a lower end constrained to rotate in a concentric manner with respect to the longitudinal axis. A generally rigid torsion rod has upper and lower ends constrained to rotate in a concentric manner, and the upper end of the torsion rod is coupled to the lower end of the power transmission shaft. A mandrel including a connection for a drill bit is interconnected with the lower end of the torsion rod such that a torque may be transmitted from the torsion rod to the mandrel to drive a drill bit.

Abstract: A drilling apparatus includes a housing that defines a longitudinal axis. A power section of the apparatus includes rotor adapted to move with eccentric rotary motion with respect to the longitudinal axis in response to the passage of drilling fluids through the power section. A power transmission shaft has an upper end coupled to the rotor and movable with the eccentric motion of the rotor, and a lower end constrained to rotate in a concentric manner with respect to the longitudinal axis. A generally rigid torsion rod has upper and lower ends constrained to rotate in a concentric manner, and the upper end of the torsion rod is coupled to the lower end of the power transmission shaft. A mandrel including a connection for a drill bit is interconnected with the lower end of the torsion rod such that a torque may be transmitted from the torsion rod to the mandrel to drive a drill bit.

Abstract: The helmet stabilization apparatus includes a helmet adapted to be worn by a user, a night vision goggle unit attached to a front portion of the helmet, and a removable counterweight attached to a rear portion of the helmet that balances with the weight of the night vision goggle unit, wherein said removable counterweight can be connected in a variety of manners, such as a magnetic means of connection, a hook and loop connection, or a mechanical means of connection. Furthermore, the helmet may provide staggered connections, such that the removable counterweight may be positioned on the helmet at the user's desired orientation. This allows the user to move the center of mass of the system such that it is self-stabilizing on the user's head. Moreover, the removable counterweight may be formed such that when it is removed, it may be coupled with an attachable handle to form a plurality of tools or weapons. This is beneficial in that it provides a collection of tools while only one object need be carried.

Abstract: The helmet stabilization apparatus includes a helmet adapted to be worn by a user, a night vision goggle unit attached to a front portion of the helmet, and a removable counterweight attached to a rear portion of the helmet that balances with the weight of the night vision goggle unit, wherein said removable counterweight can be connected in a variety of manners, such as a magnetic means of connection, a hook and loop connection, or a mechanical means of connection. Furthermore, the helmet may provide staggered connections, such that the removable counterweight may be positioned on the helmet at the user's desired orientation. This allows the user to move the center of mass of the system such that it is self-stabilizing on the user's head. Moreover, the removable counterweight may be formed such that when it is removed, it may be coupled with an attachable handle to form a plurality of tools or weapons. This is beneficial in that it provides a collection of tools while only one object need be carried.

Abstract: The helmet stabilization apparatus includes a helmet adapted to be worn by a user, a night vision goggle unit attached to a front portion of the helmet, and a removable counterweight attached to a rear portion of the helmet that balances with the weight of the night vision goggle unit, wherein said removable counterweight can be connected in a variety of manners, such as a magnetic means of connection, a hook and loop connection, or a mechanical means of connection. Furthermore, the helmet may provide staggered connections, such that the removable counterweight may be positioned on the helmet at the user's desired orientation. This allows the user to move the center of mass of the system such that it is self-stabilizing on the user's head. Moreover, the removable counterweight may be formed such that when it is removed, it may be coupled with an attachable handle to form a plurality of tools or weapons. This is beneficial in that it provides a collection of tools while only one object need be carried.