Abstract: A fluid-jet drill with a forward relatively rotatable cylindrical sleeve having a first set of openings through which fluid is directed to impinge upon the substance to be drilled and a second set of openings rearward of the forward end of the sleeve with axes directed at an angle to a tangent to the external surface of the sleeve through which a portion of the fluid is expelled to cause rotation of the cylindrical sleeve.

Abstract: A manually operable plunger extends rearwardly out of an elongated housing. An hydraulic force-multiplying system inside the housing causes a piston inside the housing to be moved forward when the plunger is pushed forward. A means causes an axially extending shaft that protrudes forwardly out of the housing to be rotated when the piston is moved forward. A conventional socket, as employed in a socket wrench, can be detachably secured to the front end of the shaft.

Abstract: A chuck for use in fastening a replaceable tool such as a drill to a rotatable shaft and particularly to a rotatable shaft powered by a motor. The chuck is in the form of a cylindrical housing formed with a taper at the tool end. A plurality of jaws, each formed with a convex or tapered surface are mounted in the tapered section of the housing with the convex or tapered side bearing against the inside tapered wal of the housing. A center pin is mounted in the housing with a first end of the pin bearing against the end of each jaw, such that motion of the pin towards the jaws forces the jaws against the tapered housing wall to close the jaws together. A cross-pin is transversely fixed through the center pin and extends through slots in the housing wall, with the slots oriented parallel to the axis of the center pin to permit both axial motion of the pin in the housing and rotation of the pin relative to the housing.