Abstract: A device for connecting two tool parts having a common axis. The device includes a fitting pin projecting axially from the first tool part and a connecting sleeve projecting from the second tool part and having a mating bore for receiving the fitting pin. A tightening mechanism equipped with a tightening bolt movable in a crossbore of the fitting point assures a sufficient planar surface to planar surface tightening between the two tool parts. Aside from the tightening in direction of the tightening bolt, a clamping of the fitting pin into the mating bore of the connecting sleeve is achieved through suitable measures, the clamping extending transversely with respect to the tightening-bolt direction and resulting in an automatic centering of the tool parts with respect to their common axis and in a reinforcement of the connection transversely with respect to the tightening-bolt axis.

Abstract: A device for the connection of two tool portions has in one of the tool portions a cylindrical fitting pin (2) and an annular surface (3). The other tool portion (4) is provided with a mating bore (5) and an annular end face for receiving the fitting pin (2), and it has two diametrically opposed, radially extending internal threads (12) each with a screw (14, 13) provided with a ball (17) or a conical recess (15). In a transverse bore (6) of the fitting pin (2) is arranged a radially displaceable tightening bolt (7) which at one end has a conical recess (8) cooperating with the ball (17) of one screw (14), and at the other end has a ball (9) which cooperates with the recess (15) of the second screw (13). Both balls (9, 17) are rotatably mounted in a ball socket (10, 16) of the tightening bolt (7) or the screw(s) (14), respectively. On tightening one of the screws (13, 14) these act upon the tightening bolt (7) so as to press together the annular surface (3) and the end face (11).

Abstract: A device for connecting two tool parts having a common axis. The device includes a fitting pin projecting axially from the first tool part and a connecting sleeve from the second tool part and having a mating bore for receiving the fitting pin. A tightening mechanism equipped with a tightening bolt movable in a crossbore of the fitting pin assures a sufficient planar surface to planar surface tightening between the two tool parts. Aside from the tightening in direction of the tightening bolt, a clamping of the fitting pin into the mating bore of the connecting sleeve is achieved through suitable measures, the clamping extending transversely with respect to the tightening-bolt direction and resulting in an automatic centering of the tool parts with respect to their common axis and in a reinforcement of the connection transversely with respect to the tightening-bolt axis.

Abstract: A machine tool spindle (1) serving to receive toolholders (13) with different shanks (8, 16) by turns has a frustoconical receiving bore (3) in its head (1a) for receiving a steep-angle taper shank of a first toolholder. The spindle head (1a) is provided with an end face (4) surrounding the frustoconical receiving bore (3). Immediately adjoining this end face there is provided a first nesting bore (8) whose diameter (D) is slightly greater than the theoretical diameter of the frustoconical receiving bore (3) in the plane of the end face (4). The axial length of the nesting bore (8) is only about 10-15% of the theoretical diameter. The nesting bore (8) serves to receive a first cylindrical nesting shoulder (15) of the second toolholder (13). At the inner end of the receiving bore (3) there is provided a second nesting bore (40) into which a second nesting shoulder (41) is arranged at that end of the toolholder (13) which is located in the spindle fits.

Abstract: That part of the sheath of an electric cable which extends through a hole in the housing of a submersible pump motor is surrounded by a metallic sleeve having end portions of reduced diameter. Such end portions and the adjacent portions of the sheath are surrounded by and bonded to tubular insulators whose maximum outer diameter does not exceed the maximum outer diameter of the sleeve. The insulators may consist of convoluted strip-shaped material or foil which is bonded to the adjacent portions of the sleeve and sheath. The clearance between the median portion of the sleeve and the surface surrounding the hole is sealed by one or more O-rings or by a bolt which is threadedly connected to the housing and surrounds the sleeve, a nut which surrounds the sleeve and meshes with the bolt, and a deformable ring seal which is interposed between the sleeve on the one hand and the bolt and nut on the other hand to be deformed by the nut when the latter is rotated in a direction to receive a larger portion of the bolt.