Abstract: An improved viscous dampening arrangement for a taut-band suspension system in an electrical indicating instrument includes a hub associated with the stator and a turret associated with the rotor. The hub and turret each have central openings for receiving the taut-band. The hub and turret are arranged, in use, in a spaced-apart facing relationship with the facing portions of hub and turret being tapered in a controlled fashion. A viscous dampening fluid is provided between the hub and turret and an anti-wetting agent is applied to the surfaces of the hub and turret where the dampening fluid is not desired. The geometry of the tapers is chosen so as to minimize the effects of longitudinal and radial shocks and vibrations on the electrical indicating instrument.

Abstract: A magnetic system for a long scale electrical meter enables four sided sensing of a coil which is completely offset from the axis of rotation has a cylindrical core pole piece magnetically coupled to first similar poles of two magnets. The core is surrounded by an inner annular air gap defined by a coaxial inner annular pole piece which is magnetically coupled to the second poles of the magnets. Radially outward is an outer annular air gap defined by a coaxial outer annular pole piece which is magnetically coupled to the first magnetic pole. Magnetic fields in the inner and outer air gaps are radial. The outer annular pole piece is closed at opposite ends by a pair of magnetically permeable discs which also are pole pieces for the first magnetic pole. Each disc is spaced apart a distance D from the nearest flat face of the inner annular pole piece to provide axial magnetic fields. Accordingly, all four sides of the coil are active.

Abstract: A meter rotor includes a preferably hollow shaft for caging filaments or ribbons, means such as openings on the shaft for engaging a coil, a pair of axially movable end caps engaging opposing ends of the shaft, a spring associated with each end cap for holding the filaments or ribbons taut but without necessarily deflecting the springs, and means on the end caps for engaging a stator.The rotor cooperates with a stator which has rotor-engaging means corresponding to the stator-engaging means on the end caps. The rotor engaging means are separated by a first distance which is greater than a second distance between the stator engaging means. The first and second distances are in a predetermined relationship so that when the rotor is positioned in the stator and the end caps are moved axially, the stator engaging means engage the stator, thereby deflecting the springs to apply tension to the filaments or ribbons.

Abstract: A compact meter with a unitary bridge including magnet support legs to which a magnet is clamped by a magnetically permeable plate and a U-shaped magnet support. Locating surfaces on the bridge cooperate with locating surfaces on the magnet, on the plate, and on the magnet support to locate these elements with respect to the bridge and the rotor. The magnetically permeable plate extends through the coil, and the region below the magnet is substantially unobstructed so that magnets of different thicknesses can be substituted, while using the same bridge, rotor and coil assembly, and plate. In a preferred embodiment the magnetically permeable plate has offset ends which permit inverting the plate to accommodate magnets of two different thicknesses while alowing the use of the same magnet support. The rotor is of composite, solder-free and cement free construction, and includes a unique clamp together arrangement for securing the several parts of the rotor together in proper positional relationship.

Abstract: A compact meter with a unitary bridge including magnet support legs to which a magnet is clamped by a magnetically permeable plate and a U-shaped magnet support. Locating surfaces on the bridge cooperate with locating surfaces on the magnet, on the plate, and on the magnet support to locate these elements with respect to the bridge and the rotor. The magnetically permeable plate extends through the coil, and the region below the magnet is substantially unobstructed so that magnets of different thicknesses can be substituted, while using the same bridge, rotor and coil assembly, and plate. In a preferred embodiment the magnetically permeable plate has offset ends which permit inverting the plate to accommodate magnets of two different thicknesses while allowing the use of the same magnet support. The rotor is of composite, solder-free and cement free construction, and includes a unique clamp together arrangement for securing the several parts of the rotor together in proper positional relationship.