Abstract: An apparatus for stimulating a subterranean formation includes a first tube, a second tube, a combustion body and an ignition propagator. The second tube is positioned within the first tube interior and the second tube interior is sealed from the first tube interior to substantially prevent fluid communication between the first tube interior and the second tube interior. The combustion body is formed from a solid propellant and is positioned within the first tube interior external to the second tube interior. The ignition propagator is positioned within the second tube interior and is substantially free from fluid contact with fluid residing in the surrounding environment external to the first tube wall.

Abstract: Method and apparatus for stimulating a subterranean formation that is penetrated by a well bore in fluid communication with the formation. At least one length of propellant is assembled with at least one shaped explosive charge that is aimed axially along the well bore toward the propellant. Detonation of the explosive charge ignites the propellant and any successive explosive charge positioned in the well bore.

Abstract: A lubricator for an angle drive attachment for pneumatic rotary tools is disclosed. An output shaft of the angle drive attachment is surrounded by a stationary lubricating sleeve. The lubricator can include an upper portion and a lower portion formed of different absorbent materials. The upper portion can be formed of a highly absorbent material such as felt so as to act as a reservoir and reabsorb lubricant which has been thrown off of the gears while the tool is in operation. The lower portion of the lubricator can be formed of a less absorbent porous material such as open cell styrofoam to slowly meter the lubricant onto the gears through capillary action. Alternatively, the angle drive lubricator can be formed of a single piece of absorbent material.

Abstract: A chuck for a rotary tool includes a body having a cylindrical bore for receiving the shank of a work performing member. A sleeve surrounds the body and forms an annular space in which is disposed a pair of opposed jaws which extend through opposed slots in the body for forcibly engaging the shank. The jaws each include an integral lever and an outer edge forming a fulcrum about which the levers are pivoted to force the jaws into engagement with the shank. A nut with a conical cam surface is threadedly disposed on the body and engages the levers in response to manual turning of the nut to clamp or release the shank.