Abstract: A relay having a coil including a core also has either one or two angled armatures. Each of two armatures has a second leg extending approximately parallel to the axis of the coil as well as an extension upon which a restoring spring acts. Each armature has a contact spring which is connected thereto. Due to the displacement of the bearing location the end of the second armature leg, increased friction at the contact locations arises as well as reduction in the welding tendency of the contacts. Reduction of the effective spring force of the restoring spring during armature attraction also arises due to the seating of the armature so that reliable operation is provided without increased electromagnetic excitation.

Abstract: A current overload tripping device having a time-delayed leading tripping action during uneven loading of the phases of a multiphase circuit. The tripping device includes a current pickup for each phase wherein the current pickup members are connected in series with one another and with an electromagnetic converter. Each of the current pickup members comprises a winding surrounding a magnet yoke of an electromagnetic tripping device of each phase and the electromagnetic converter comprises a temperature/time-dependent device operating to provide a time-delayed tripping signal.

Abstract: Electrical switches and circuit breakers in which the contacts and operating mechanism are enclosed within an insulating housing by an insulating cover and which have an elongated operating handle extending through an elongated slot in the cover have an enlarged terminal portion of the operating handle which is wider than the slot to prevent removal of the cover except in positions of the handle at which the electrical contacts are open and the slot is wider than the terminal portion of the handle. Preferably, this is only the OFF position of the switch or breaker, however, in circuit breakers with a notch at the trip position to expose indicia indicating the breaker operating condition, a transverse pin through the operating handle permitting removal of the cover only with the operating handle in the trip position, provides an economical backfit.

Abstract: In this method of lengthening the blade aerofoil (5) of turbo machines by building up with weld in the assembled condition of the blades, the position (4) to be welded at the end of the blade aerofoil (5) is encased by a metal mold (1,2). The mold (1,2) has a connection (3) where one pole of the welding circuit is connected. The end (4) of the blade aerofoil is lengthened or repaired by applying runs of weld. The mold (1,2) can be optionally supplemented with heating and/or cooling arrangements and also with a protective gas supply.

Abstract: An improved consumable electric arc welding electrode having an outer ferrous metal sheath, such as a low carbon steel sheath, which is formed around a generally concentric core of compressed particulate fill material to be used for depositing an all weld metal of steel in multiple passes with a minimum tensile strength of about 72,000 psi and a minimum elongation of about 22 percent wherein the fill material includes aluminum in an amount greater than about 1.50 percent of the total electrode weight to provide a correlated amount of aluminum in the deposited metal. This improvement involves a particulate fill material producing a combination of nickel and manganese content in the range of 2.5-4.0 percent by weight of the total electrode with the nickel being greater than about 0.5 percent, the manganese being in the range of 0.7-2.

Abstract: Warping and twisting of the armature of a polyphase alternating current air break contactor is reduced by mounting the operating coil near the middle of the armature. A polyphase alternating current air break contactor has a frame, an armature having two ends, the ends being rotatably mounted within the frame so that the armature may rotate within the frame, at least three movable contacts and at least three stationary contacts forming a contact pair of each phase of the polyphase alternating current, and the contactor has an operating coil for the armature mounted in the frame substantially midway between the two ends of the armature.

Abstract: The device for making a peripheral welding seam on a cylindrical tube (1) is attachable on the tube (1), is equipped with a rotary drive (15) for a rotational movement of the welding tool about the tube axis and is defined in that it has two rotatable rollers (10, 12) fastened to the device and arranged fixedly at a distance from one another in the peripheral direction and a third pivotable drive roller (15) connected to the drive. In the cross-sectional direction of the tube (1), the space between the rollers (10, 12, 15) has a larger dimension than the tube (1). When the dirve roller (15) is partially pivoted away, a lateral insertion orifice for the tube is consequently provided and likewise has larger dimensions than the tube (1).