Abstract: Apparatus couples optical fiber to an optoelectronic component with a collet, a cylindrical member, a connector, and hermetically sealing means. The collet has a central orifice through a knurled end portion, a central portion with a male thread, and a second end portion formed with a slotted cone sleeve. The cylindrical member has opposed centrosymmetric recesses that meet, forming a small axially oriented aperture. One recess is formed with an axial female thread, with a conical indentation terminating at the aperture. The female thread can to engage with the collet male thread. Thread engagement of member and collet results in engagement of the member at the conical indentation with the coned sleeve, drawing the slotted sides inwardly, firmly gripping the collet held optical fiber. The other recess has a second axial female thread from the opposite end of the member toward the aperture. The member has a radially directed sight hole.

Abstract: In a mine tool of the type having a drive body holding a bit, the drive body includes forwardly projecting flanges each having a bit engaging surface for transmitting torque to the bit and the bit includes an independent means for securing the bit to the drive body against forward separating movement.

Abstract: In a mine tool of the type having a drive body holding a bit, the bit and drive body include complimentary and mating surfaces wherein one pair of surfaces are adapted to be in overlapping relationship when the bit is twisted in a direction opposite the rotational direction for detachably mounting the bit to the drive body.

Abstract: A rotating vacuum shaft assembly includes a housing, a hollow shaft positioned in an opening in the housing and at least one seal made of a fluorocarbon polymer material disposed in the region around the shaft to permit a vacuum to be drawn through the shaft while it is rotated. The seal has deformable ribs which contact the surface of the shaft and the internal walls of the housing, the ribs deforming when a pressure difference exists across the seal thereby enhancing the quality of the seal.