Abstract: A kelly-bar apparatus includes, for example, an inner kelly-bar, a second kelly-bar and an outer kelly-bar. These kelly-bars are relatively telescopically operable and torque is transmitted from outside to inside. When the second and outer kelly-bar are in a contracted position, they are supported by a spring on a spring support fixed to the inner kelly-bar. The bottom end of a torque transmitting projection of the inner kelly-bar is fitted into and welded to the spring support. The spring support is fixed onto an engagement member formed integrally with the inner kelly-bar. In addition, a stop member for preventing the second kelly-bar from coming away from the outer kelly-bar projects from the inner periphery of the outer kelly-bar at a location above the torque transmitting portion.

Abstract: A fastening system or mechanism for fastening a cover member of a first, resilient material to a base member of a second, relatively rigid material to form a tape cartridge housing comprises a single rigid fastener connected between the base and cover members and at least one expansion or slip fastener rigidly connected to one of the members and loosely connected to the other member in a manner permitting a predetermined degree of relative sliding movement between the members in any direction in the plane parallel to the base and cover members, while restricting perpendicular movement between the members. In the preferred embodiment, the expansion fastener comprises a headed post or screw extending through an enlarged opening in one of the members with some free play and fastened in an opposing bore in the other member.

Abstract: A cross-coil winding system for forming woven stator coil windings for an air-core gauge that has orthogonal coils with equal radii. The system employs a bobbin positioner that moves a bobbin along a path in a manner that permits forming layers of interlaced windings about the bobbin.